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0000c2f981838f81c47759242ea123b6121401a9 | ## Memory Attacks on Device-Independent Quantum Cryptography
Jonathan Barrett,[1, 2,][ ∗] Roger Colbeck,[3, 4,][ †] and Adrian Kent[5, 4,][ ‡]
1Department of Computer Science, University of Oxford,
Wolfson Building, Parks Road, Oxford OX1 3QD, U.K.
2Department of Mathematics, Royal Holloway, University of London, Eg... | Memory attacks on device-independent quantum cryptography. | Device-independent quantum cryptographic schemes aim to guarantee security to users based only on the output statistics of any components used, and without the need to verify their internal functionality. Since this would protect users against untrustworthy or incompetent manufacturers, sabotage, or device degradation,... | 2012.0 | 2012-01-20 00:00:00 | https://www.semanticscholar.org/paper/0000c2f981838f81c47759242ea123b6121401a9 | Physical Review Letters | True |
0002c60ed10a8868930b8f971af29e62b498f6b8 | OBSERVARE
Universidade Autónoma de Lisboa
e-ISSN: 1647-7251
Vol. 14, Nº. 1 (May-October 2023)
# NOTES AND REFLECTIONS
PROBLEMS OF EVALUATION OF DIGITAL EVIDENCE BASED ON
BLOCKCHAIN TECHNOLOGIES[1]
**OTABEK PIRMATOV**
[pirmatov.otabek.89@inbox.ru](mailto:pirmatov.otabek.89@inbox.ru)
Assistant Professor of the De... | Problems of evaluation of digital evidence based on blockchain technologies | 2023.0 | NaT | https://www.semanticscholar.org/paper/0002c60ed10a8868930b8f971af29e62b498f6b8 | JANUS NET e-journal of International Relation | True | |
000523657fe1a5879d72c099f619ea0de4424bff | ERROR: type should be string, got "https://doi.org/10.1007/s13762 022 04079 x\n\n**REVIEW**\n\n# Plastic waste recycling: existing Indian scenario and future opportunities\n\n**R. Shanker[2] · D. Khan[2] · R. Hossain[1] · Md. T. Islam[1] · K. Locock[3] · A. Ghose[1] · V. Sahajwalla[1] · H. Schandl[3] ·**\n**R. Dhodapkar[2]**\n\nReceived: 13 December 2021 / Revised: 23 February 2022 / Accepted: 4 March 2022 / Published online: 2 April 2022\n© The Author(s) under exclusive licence to Iranian Society of Environmentalists (IRSEN) and Science and Research Branch, Islamic Azad University 2022\n\n**Abstract**\nThis review article aims to suggest recycling technological options in India and illustrates plastic recycling clusters and reprocessing infrastructure for plastic waste (PW) recycling in India. The study shows that a majority of states in India are engaged\nin recycling, road construction, and co-processing in cement kilns while reprocessing capabilities among the reprocessors\nare highest for polypropylene (PP) and polyethylene (PE) polymer materials. This review suggests that there are key opportunities for mechanical recycling, chemical recycling, waste-to-energy approaches, and bio-based polymers as an alternative\nto deliver impact to India’s PW problem. On the other hand, overall, polyurethane, nylon, and polyethylene terephthalate\nappear most competitive for chemical recycling. Compared to conventional fossil fuel energy sources, polyethylene (PE),\npolypropylene (PP), and polystyrene are the three main polymers with higher calorific values suitable for energy production.\nAlso, multi-sensor-based artificial intelligence and blockchain technology and digitization for PW recycling can prove to be\nthe future for India in the waste flow chain and its management. Overall, for a circular plastic economy in India, there is a\nnecessity for a technology-enabled accountable quality-assured collaborative supply chain of virgin and recycled material.\n\n**Keywords Informal and formal sector · Biological recycling · Chemical recycling · Mechanical recycling · Digitization ·**\nBlockchain technology\n\n\n### Introduction\n\nPlastic has evolved into a symbol of human inventiveness as\nwell as folly which is an invention of extraordinary material\nwith a variety of characteristics and capacities. Although\nIndia is a highly populated country, it is ranked 12th among\nthe countries with mismanaged plastics but it is expected\n\nEditorial responsibility: Maryam Shabani.\n\n- D. Khan\nk.debishree@neeri.res.in\n\n1 Centre for Sustainable Materials Research and Technology,\nSMaRT@UNSW, School of Materials Science\nand Engineering, UNSW Sydney, Sydney, NSW 2052,\nAustralia\n\n2 Council of Scientific and Industrial Research-National\nEnvironmental Engineering Research Institute\n(CSIR-NEERI), Nehru Marg, Nagpur 440 020, India\n\n3 Commonwealth Scientific and Industrial Research\nOrganisation (CSIRO) and Australian National University,\nCanberra, ACT 2601, Australia\n\n\nthat by the year 2025, it will be in 5th position (Neo et al.\n2021). Therefore, recycling or upscaling, or reprocessing of\nPW has become the urgency to curb this mismanagement\nof plastics and mitigate the negative impacts of plastic consumption and utilization from the environment. However,\nthis resource has not been given the required attention it\ndeserves after post-consumer use. Recycling or reprocessing\nof PW usually involves 5 types of processes based on the\nquality of the product manufactured upon recycling of the\nwaste, namely upgrading, recycling (open or closed loop),\ndowngrading, waste-to-energy plants, and dumpsites or\nlandfilling, as shown in Fig. 1 (Chidepatil et al. 2020). Usually, the PW is converted into lower-quality products such\nas pellets or granules, or flakes which are further utilized in\nthe production of various finished products such as boards,\npots, mats, and furniture (Centre for Science and Environment (CSE) 2021).\nPlastics have a high calorific value, with polymer energy\nvarying from 62 to 108 MJ/kg (including feedstock energy)\nwhich is much greater than paper, wood, glass, or metals\n(with exception of aluminum) (Rafey and Siddiqui 2021).\n\nV l (0123456789)1 3\n\n\n-----\n\n**Fig. 1 Different processing**\npathways for plastic waste\n(modified from Chidepatil et al.\n2020)\n\nPW mishandling is a significant concern in developing\nnations like India due to its ineffective waste management\ncollection, segregation, treatment, and disposal which\naccounts for 71% of mishandled plastics in Asia (Neo et al.\n2021). Though there are numerous sources for PW the major\nfraction is derived from the post-consumer market which\ncomprises both plastic and non-PWs and therefore, these\nwastes require to be washed and segregated accordingly\nfor conversion into the homogenous mixture for recycling\n(Rafey and Siddiqui 2021). According to a study carried out\nby the Federation of Indian Chambers of Commerce and\nIndustry (FICCI) and Accenture (2020), India is assumed to\nlose over $133 billion of plastic material value over the coming next 10 years until 2030 owing to unsustainable packaging out of which almost 75% of the value, or $100 billion,\ncan be retrieved. This review article focuses on levers and\nstrategies that could be put in place to transition India toward\na circular economy for plastics. This involves two key areas,\nthe first being reprocessing infrastructure in various states\nof India and the performance of the reprocessors in organized and unorganized sectors. The second key area for this\nstudy is an overview of the rapidly evolving area of plastic\nrecycling technologies, including mechanical recycling,\nchemical recycling, depolymerization, biological recycling,\nand waste-to-energy approaches. A brief description of the\ntechnologies is provided and their applicability to the Indian\ncontext discussed along with the role of digitization in PW\nrecycling.\n\n## 1 3\n\n\n### Research motivation and scope of the article\n\nThe research on Indian PW and its recycling pathways\naccording to the polymer types and its associated fates were\nstudied along with the published retrospective and prospective studies. Due to COVID-19, there is an exponential\nincrease in the PW and the urge to recycle this waste has\nbecome a necessity. Systematic literature studies from database collection of Web of Science (WoS) were performed\nwith keywords such as “PW recycling technologies in India”\nOR “PW management in India” OR “plastic flow in India”\nfrom 2000 to October 2021 (including all the related documents such as review papers, research papers, and reports)\nwhich in total accounted for 2627 articles only. When the\nsame keyword “plastic recycling” was searched without\ncontext to India, 5428 articles were published from 2000\nto 2021 among which only 345 articles were published by\nIndian authors. Figure 2 shows the distribution of papers on\nPW and related articles over the years. However, the number\nof review articles remains very limited concerning published\nresearch papers and reports for the same. Review articles\nplay a vital role in the substantial growth in the potential\nresearch areas for the enhancement of the proper management strategies in the respective domains. Recently, PW\nand its sustainable management necessity toward achieving\na circular economy have attracted researchers, due to its detrimental effects on humans and the environment.\n\n\n-----\n\n**Fig. 2 Yearly distribution of**\npapers related to plastic waste\nrecycling from 2000 to October\n2021\n\n\n640\n\n600\n\n560\n\n520\n\n480\n\n440\n\n400\n\n360\n\n320\n\n280\n\n240\n\n200\n\n160\n\n120\n\n\n### Reprocessing infrastructure and recycling rates for different types of plastics\n\nRecycling rates of plastics vary between countries depending upon the types of plastic. Some polymers are recycled\nmore than other types of polymers due to their respective\ncharacteristics and limitations. While PET (category 1) and\nHDPE (high-density polyethylene) (category 2) are universally regarded as recyclable, PVC (polyvinyl chloride) (category 3) and PP (category 5) are classified as “frequently\nnot recyclable” owing to their chemical characteristics, however, they may be reprocessed locally depending on practical\nconditions. LDPE (low-density polyethylene) (category 4)\nis however difficult to recycle owing to stress failure, PS\n(category 6) may or may not be recyclable locally, and other\ntypes of polymers (category 7) are not recyclable due to the\nvariety of materials used in its manufacturing (CSE 2021).\nAbout 5.5 million metric tonnes of PW gets reprocessed/\nrecycled yearly in India, which is 60% of the total PW produced in the country where 70% of this waste is reprocessed\nin registered (formal) facilities, 20% by the informal sector\nand the rest 10% is recycled at household level (CSE 2020).\nThe remaining 40% of PW ends up being uncollected/littered, which further results in pollution (water and land) and\nchoking of drains (CSE 2019a). PW is dumped into landfills\nat a rate of 2.5 million tonnes per year, incinerated at a rate\nof over 1 million tonnes per year, and co-processed as an\nalternative energy source in blast furnaces at a rate of 0.25\nmillion tonnes per year by cement firms (Rafey and Siddiqui\n2021). Thermoset plastics (HDPE, PET, PVC, etc.), which\n\n\n110 119\n85 [102 ]86 87\n76\n66\n\n35 41\n1 5 8 5 4 7 4 11 14 11 15 22\n\nResearch Paper Review Articles\n\nare recyclable, constitute 94% of total PW generated, and\nthe remaining 6% comprises other types of plastics which\nare multilayered, thermocol, etc. and are non-recyclable\n(CSE 2019b). Plastics such as PP, PS, and LDPE are partially recyclable but generally not recycled in India due to\nthe economic unviability of their recycling processes (CSE\n2020). Figure 3a shows the recycling rates of different kinds\nof plastics in India and Fig. 3b shows the percentage contribution of different recycling options in the Indian context.\n\n#### State‑wise facilities and flows of PW\n\nThe total plastic generation in India by 35 states and union\nterritories accounts for 34,69,780 tonnes/annum (~ 3.47 million tonnes/annum) in the year 2019–2020 (CPCB (Central\nPollution Control Board) 2021). Plastic processing in India\nwas 8.3 Mt in the 2010 financial year and increased to 22 Mt\nin 2020 (Padgelwar et al. 2021). Table 1 shows the state-wise\nPW generation, registered and unregistered plastic manufacturing/recycling units, and multiplayer manufacturing units\nacross the country. Furthermore, the main recycling clusters\nin India are presented in Fig. 4, wherein Gujarat (Dhoraji,\nDaman and Vapi), Madhya Pradesh (Indore), Delhi and\nMaharashtra (Malegaon, Mumbai (Dharavi and Bhandup),\nSolapur) are the main recycling hubs (Plastindia Foundation\n2018). Recycling processes and disposal methods for PW\nvary substantially across the states in India given in Table 1.\nDetails of some of the major infrastructure available in the\nstates are described in the following subsection.\n\n## 1 3\n\n\n-----\n\n**Fig. 3 a Recycling rates of**\ndifferent types of plastics in **(a)** 2.4%\nIndia (data extracted from CSE 7.6%\n2019b) and b percentage contribution of different recycling\noptions in the Indian context\n(CSE 2021)\n\n25%\n\n20%\n\nPVC HDPE\n\nThe door-to-door collection of solid waste is the most\ncommon practice for the collection of waste in almost all the\nstates. Urban Local Bodies (ULBs) of some states like Goa,\nHimachal Pradesh, Maharashtra, Uttarakhand, and West\nBengal are actively involved in the collection and segregation of waste (CPCB 2019; Goa SPCB 2020; MPCB 2020).\nFurther after collection and segregation of waste, the PW is\nsent to various disposal (landfills) and recycling pathways\n(recycling through material recovery, road construction,\nwaste-to-energy plants, RDF (refused derived fuel), etc.).\nGoa is the state where new bailing stations have been set up\nin addition to the existing facilities for the disposal of PW\n(Goa SPCB 2020). State like Kerala has taken the initiative\nfor the installation of reverse vending machines (RVMs) for\nplastic bottles in supermarkets and malls whereas Maharashtra ensures 100% collection of waste with proper segregation and transport of PW where 62% of the waste is being\nreprocessed through different methods (Kerala SPCB 2020;\nMPCB 2020). Special Purpose Vehicles (SPVs) in Punjab\nhave been effective for the collection of multilayered plastics\n(MLP) waste from different cities of the state and further\nbeing sent to waste-to-energy plants (Punjab Pollution Control Board (PPCB) 2018). Though almost all the states have\nimposed a complete ban on plastic bottles and bags, Sikkim\nwas the first state who enforce the ban into the state which\nresulted in the reduction in its carbon footprint (MoHUA\n2019). Many states such as Puducherry, Odisha, Tamil Nadu,\nTelangana, Uttar Pradesh, and West Bengal send their PW\nfor reprocessing in cement kilns (CPCB 2019). Some states\nlike Telangana have taken the initiative for source segregation of the waste from the households by separating the\nbins into dry and wet waste bins whereas the mixed waste\nis sent for further processing for road construction or in\ncement industries (Telangana State Pollution Control Board\n\n## 1 3\n\n\n(TSPCB) 2018). Along with all these facilities in different\nstates, several informal and unregistered recyclers are also\ncontributing to their best to combat PW mismanagement.\n\n#### Formal and informal sectors in India and their performance\n\nThe informal sector currently contributes 70% of PET recycling in India (Aryan et al. 2019). Approximately 6.5 tonnes\nto 8.5 tonnes per day of PW is collected by itinerant waste\nbuyers (IWBs) and household waste collectors in India, out\nof which 50–80% of PW is recycled (Nandy et al. 2015).\nKumar et al. (2018) mentioned that the average PW collected\nby a waste picker and an IWB was approximately 19 kg/d\nand 53 kg/d, respectively. According to ENF (2021), there\nare approximately 230 formal PW reprocessors in India,\nwho can recycle various types of the polymer as shown in\nFig. 5. However, the organized and unorganized sectors play\na vital role in the reprocessing of plastics in India. Table 2\nshows the distribution of organized and unorganized sectors along with the percentage growth in India. Most of the\noperations are currently related to mechanical recycling producing granules/pellets and flakes. In 30 states/UTs, there\nare 4953 registered units with 3715 plastic manufacturers/\nproducers, 896 recyclers, 47 compostable manufacturing,\nand 295 multilayered packaging units however, 823 unregistered units have been reported from different states (CPCB\n2021). However, data on reprocessing capability (material\nprocessed in terms of tonnes/year) of the individual recyclers\nare not readily available. With the limited data, it varies from\n2500 to 3000 tonnes/year whereas capacity for processing\nvarious PW varies from 600 to 26,250 tonnes/year (ENF\n2021).\n\n\n-----\n\n**Table 1 Plastic generation, plastic manufacturing, and recycling units in different states in India and status of plastic recycling and disposal in**\ndifferent states\n\n\nPossible recycling and\ndisposal methods involved\n\n\nMultilayer\nmanufacturing\nunits\n\n\nStates/UT Plastic generation (tonnes/\nannum)\n\n\nRegistered plastic manu- Unregistered plastic\nfacturing/recycling units manufacturing/recycling\nunits\n\n\nAndaman and Nicobar 386.85 – – – Recycling, Road construction\nAndhra Pradesh 46,222 Manufacturing units— – – Recycling, Road construc131 tion, Co-processing in\nCompostable units—1 cement kilns\n\nArunachal Pradesh 2721.17 – – – No information\nAssam 24,970.88 Manufacturing units—18 – 5 Road construction, Coprocessing in cement\nkilns\nBihar 4134.631 Manufacturing/Recycling Producers—225 – No information\nunits—8 Brand owners—203\nRecyclers—36\n\nChandigarh 6746.36 Recycling units—7 – – RDF processing plant\nChhattisgarh 32,850 Manufacturing units—8 – – Recycling, Co-processing\nRecycling units—8 in cement kilns, Wasteto-energy plant\nDaman Diu & Dadra 1947.7 343 – – No information\nNagar Haveli\n\nDelhi 230,525 Producers—840 – – Waste-to-energy plant\nGoa 26,068.3 Manufacturing units—35 – 1 Recycling, Co-processing\nCompostable unit—1 in cement kilns, Sanitary landfills\nGujarat 408,201.08 Manufacturing/Recycling – 10 Co-processing in cement\nunits—1027 kilns\nCompostable units—12\n\nHaryana 147,733.51 Manufacturing units—69 – 28 Road construction\nCompostable unit—1\n\nHimachal Pradesh 13,683 No information 24 79 Road construction, Coprocessing in cement\nkilns, Waste-to-energy\nplants\nJammu & Kashmir 74,826.33 259 45 – No information\nJharkhand 51,454.53 Manufacturing units—59 – – Road construction, Coprocessing in cement\nkilns, Reverse Vending\nMachines\nKarnataka 296,380 Manufacturing/Recycling 91 – Recycling, Co-processing\nunits—163 plants\nKerala 131,400 Manufacturing units— – – Recycling\n1266\nProducers—82\nRecycling units—99\nCompostable unit—1\n\nLakshadweep 46 – – – Recycling\nMadhya Pradesh 121,079 Manufacturing and Recy- – 22 Recycling, Road construccling units—164 tion, Co-processing in\nCompostable unit—1 cement kilns\n\nMaharashtra 443,724 Recycling units—62 42 – No information\nCompostable manufacturing units—6\n\nManipur 8292.8 Manufacturing units—4 – – No information\nMeghalaya 1263 4 – – Road construction\nMizoram 7908.6 – – – Recycling\n\n## 1 3\n\n\n-----\n\n**Table 1 (continued)**\n\nStates/UT Plastic generation (tonnes/\nannum)\n\n\nPossible recycling and\ndisposal methods involved\n\n\nRegistered plastic manu- Unregistered plastic\nfacturing/recycling units manufacturing/recycling\nunits\n\n\nMultilayer\nmanufacturing\nunits\n\n\nNagaland 565 Manufacturing units—4 – – Recycling, Road construction\nOdisha 45,339 Manufacturing units—13 – 3 Co-processing in cement\nkilns\nPunjab 92,890.17 Manufacturing/Recycling 48 4 Recycling\nunits—187\nCompostable units—2\nMaterial Recovery Facility—169\n\nPuducherry 11,753 Manufacturing/Recycling – 4 Road construction, Counits—49 processing in cement\nCompostable unit—1 kilns\n\nRajasthan 51,965.5 Manufacturing units—69 – 16 No information\nSikkim 69.02 – – – No information\nTamil Nadu 431,472 Manufacturing units—78 – 3 Recycling, Road construcRecycling units—227 tion, Co-processing in\ncement kilns\nTelangana 233,654.7 Manufacturing/Recycling – 2 Recycling, Road construcunits—316 tion, Co-processing in\ncement kilns\nTripura 32.1 Manufacturing units—26 – 2 No information\nRecycling units—4\n\n\nUttarakhand 25,203.03 Manufacturing/Recycling\nunits—33\nCompostable units—2\n\n\n15 28 Recycling\n\n\nUttar Pradesh 161,147.5 Manufacturing units—99 23 63 Road construction, CoRecycling units—16 processing in cement\nCompostable units—4 kilns, Waste-to-energy\n\nplant, Production of fibers and raw materials\nWest Bengal 300,236.12 Manufacturing/Recycling – 9 Road construction\nunits—157\nCompostable unit—1\n\nData sources: (Central Pollution Control Board 2019; Central Pollution Control Board 2021; CSE 2020; Goa State Pollution Control Board\n2020; Tamil Nadu Pollution Control Board 2020; Haryana State Pollution Control Board 2020; Jammu and Kashmir State Pollution Control\nBoard 2018; Kerala State Pollution Control Board 2020; Maharashtra Pollution Control Board 2020; Uttarakhand Pollution Control Board 2019;\nUttar Pradesh Pollution Control Board 2021)\n\n\nIn the Indian context, the scale of operation and quantity of material handled by the formal sector is insignificant\nwhen compared to the informal sector (Nallathambi et al.\n2018). However, data on the contribution of the informal\nsector in PW recycling in India are very limited (Kumar\net al. 2018). Formal recycling is constrained to clean, separated, pre-consumer waste in a few places in India, even if\nthe states have efficient recycling technology and resources,\nas in Gujarat and Maharashtra (TERI 2021). At present, the\ntotal numbers of organized and unorganized recycling units\nin India are 3500 and 4000, respectively (Satapathy 2017).\nThe formal recyclers face challenges in providing supply\nsecurity for reprocessed plastic materials as the current\nsupply is dominated by informal recyclers (TERI 2021). In\n\n## 1 3\n\n\nrecovering consumer waste (including PW), the informal\nsector and households play a vital role in the waste collection; approximately 6.5–8.5 Mt of PW are collected by\nthese entities, which is about 50–80% of the plastic produced\n(Nandy et al. 2015). PW collection, dismantling, sorting,\nshredding and cleaning, compounding, extrusions (pellet\nmaking) and new product manufacturing are the key activities done by the informal sector PW supply chain in India\n(WBCSD 2017).\nAmong the formal recyclers, Banyan Nation has implemented a proprietary washing technology to remove ink\nand markings from PW in the mechanical recycling process\n(Banyan Nation 2020). The recycler has integrated plastic recycling technology with data intelligence (real-time\n\n\n-----\n\n**Fig. 4 Plastic recycling clusters in India (Plastindia Foundation 2018)**\n\n**Fig. 5 Number of reprocessors** 120\naccording to polymer types\n\n104\n\nin India (ENF 2021). (Abbreviations: ABS: Acrylonitrile 100\nbutadiene styrene; HIPS: High 86\nimpact polystyrene; LLDPE: 80\nLinear low-density polyethyl- 73\nene; PA: Polyamide; PBT: Poly- 64\nbutylene terephthalate; SAN: 60\nStyrene acrylonitrile; POM:\nPolyoxymethylene; PMMA:\nPoly(methyl methacrylate); 40\nTPE: Thermoplastic elastomer)\n\n\n## 1 3\n\n\n-----\n\n**Table 2 Distribution of organized and unorganized plastic recycling units in India (Plastindia Foundation 2019)**\n\nParameters 2018 report 2019 report Percentage growth\n\nNo. of organized recycling units 3500 100 − 93%\nNo. of unorganized recycling units 4000 10,000 60%\nDirect manpower 600,000 100,000 − 83%\nIndirect manpower (including ragpickers) 1 million 1–1.5 million 50% (concerning upper limit)\nAmount of plastic waste recycled 5.5 million metric 6 million metric tonnes 8.3%\ntonnes\n\n\nlocation of informal sector PW collectors and their capacity\nfor waste processing), which has enhanced its performance\nin high-quality waste collection and recycling (Banyan\nNation 2020). The informal sector is largely involved in\nrecycling PET bottles (mainly collection and segregation).\nHorizontal turbo washers and aglow machines are widely\nused in PE granule production by the informal sector (Aryan\net al. 2019). The Alliance of Indian Waste Pickers comprises 30 organizations in 24 cities of the country, working\nin collaboration with waste pickers, acknowledging their\ncontribution, and urging for them to be integrated into the\nwaste management system. For the informal sector, a proper\ncollection network, linking GPS (Global Positioning System) to points of segregation, and tracking vehicles should\nbe considered in a consolidated framework (Jyothsna and\nChakradhar 2020).\nThe organized/formal and unorganized/informal sectors\nare not discrete and do not vie for waste; instead, they are\ninterdependent and coherent as the formal recyclers can\noperate because the informal sector performs the onerous\ntask of conveying utilizable PW to the formal sector in the\nform of aggregates, pellets, flakes and, in a few instances,\neven the finished product. Since formal commodities are\nthe ones who purchase their final goods, the informal sector relies on the formal sector. Furthermore, the informal\nsector's financial capability and ability to invest in infrastructure and equipment to manufacture goods on their own\nare restricted and therefore both communities have a mutual\nrelationship (CSE 2021).\n\n### Overview on plastic recycling technologies and their applicability to India\n\nFrom waste to material recovery, PW recycling can broadly\nbe categorized into mechanical recycling, chemical recycling, biological recycling, and energy recovery (Al-Salem\net al. 2017). The most preferable type of recycling is primary\nrecycling because of its contamination-free feature which\nfurther facilitates a smaller number of operating units resulting in the optimal amount of consumption of energy supply and resources which is further followed by secondary\n\n## 1 3\n\n\nrecycling (mechanical recycling) for recycling PW (CSE\n2021). However, processing difficulties and the quality\nof recyclates are the main drivers for seeking alternative\napproaches (Ragaert et al. 2017). Comparatively, tertiary\nrecycling or chemical/feedstock recycling is a less favored\nalternative because of high production and operational\ncosts, as well as the lack of scalable commercial technology in India whereas quaternary recycling which involves\nenergy recovery, energy from waste, or valorization of PW,\nis least preferred due to uncertainty around propriety and\nprominence of the technology, and the negative potential\nto convert land-based pollution to water and air pollution,\nbut anyhow more preferable than dumping into the landfill\n(Satapathy 2017; CSE 2021). Figure 6 shows the categorization of the recycling process of PW.\n\n#### Recycling technologies\n\n**Mechanical recycling (MR)**\n\nMechanical recycling (also known as secondary, material\nrecycling, material recovery, or back-to-plastics recycling)\ninvolves physical processes (or treatments) that convert PW\ninto secondary plastic materials. It is a multistep process\ntypically involving collection, sorting, heat treatment with\nreforming, re-compounding with additives, and extruding\noperations to produce recycled material that can substitute\nfor virgin polymer (Ragaert et al. 2017; Faraca and Astrup\n2019). It is conventionally capable of handling only singlepolymer plastics, such as PVC, PET, PP, and PS. It remains\none of the dominant recycling techniques utilized for postconsumer plastic packaging waste (PlasticsEurope 2021).\nThere are various key approaches to sorting and separating\nPW for MR, including zig-zag separator (also known as an\nair classifier), air tabling, ballistic separator, dry and wet\ngravity separation (or sink-float tank), froth flotation, and\nelectrostatic separation (or triboelectric separation). There\nare also some newer sensor-based separation technologies\navailable for PW which include plastic color sorting and\nnear-infrared (NIR) (Ministry of Housing & Urban Affairs\n(MoHUA) 2019). Fig. S1 of the supplementary material\n\n\n-----\n\n**Fig. 6 Plastic waste flow and recycling categorization (Modified from FICCI 2016; Sikdar et al. 2020; Tong et al. 2020)**\n\n\nshows the overall mechanical reprocessing infrastructure\nfor plastics.\nAfter the collected plastics are sorted, they are melted\ndown directly and molded into new shapes or are re-granulated (with the granules then directly reused in the manufacturing of plastic products). In the re-granulation process,\nplastic is melted down after being shredded into flakes, then\nprocessed into granules (Dey et al. 2020).\nDegradation and heterogeneity of PW create significant\nchallenges for recyclers involved in mechanical recycling\nas in many cases, recycled plastics do not have the same\nmechanical properties as virgin materials and therefore,\nseveral challenges emerge while recycling mono and mixed\nPW. Furthermore, difficulties in developing novel technologies to remove volatile organic compounds to improve the\nquality of recycled plastics is one of the key technological\nchallenges in mechanical recycling (Cabanes et al. 2020).\nDifferent polymers degenerate under their specific characteristics such as oxidation, light and heat, ionic radiation,\nand hydrolysis where thermal–mechanical degradation and\ndegradation during lifetime are the two ways by which it\n\n\noccurs while recycling or reprocessing of PW (Ragaert et al.\n2017). Faraca and Astrup (2019) also state that models to\npredict plastic performance based on the physical, chemical, and technical characteristics of PW will be critical in\noptimizing these processes. Other than technical challenges,\nthe mechanical recycling process possesses social and economic challenges such as sorting of mixed plastics, lack of\ninvestments and legislation, and quality of recycled products\n(Payne et al. 2019).\n\n**Chemical recycling**\n\nChemical recycling, tertiary recycling, or feedstock recycling refers to the transformation of polymers into simple\nchemical structures (smaller constituent molecules) which\ncan be utilized in a diverse range of industrial applications\nand/or the production of petrochemicals and plastics (Bhagat\net al. 2016; Jyothsna and Chakradhar 2020). This type of\nrecycling directly involves fuel and chemical manufacturers\n(Bhagat et al. 2016). Pyrolysis, hydrogenation, and gasification are some of the chemical recycling processes (Singh\n\n## 1 3\n\n\n-----\n\nand Devi 2019). The food packaging sector could be the\nmain industry to utilize outputs from the chemical recycling\nprocess (BASF 2021).\nWhen molecules, combustible gases, and/or energy are\ngenerated in a thermal degradation process, molecules, combustible gases, and/or energy are generated as multi-stream\noutputs whereas layered and complex plastics, low-quality\nmixed plastics, and polluted plastics are all viable targets\nfor chemical/feedstock recycling (CSE 2021). From an\noperational standpoint, utilizing residual chars and no flue\ngas clean-up requirements are the main advantages, while\nfrom an environmental point of view, reduction in landfilling coupled with reduced GHGs (green-house gases) and\nCO2 (carbon dioxide) emissions are added benefits. Ease of\nuse in electricity and heat production and easily marketed\nproducts are some of the financial advantages of pyrolysis\n(Al-Salem et al. 2010). Plasma pyrolysis is a state-of-the-art\ntechnology in which thermo-chemical properties are being\nintegrated with pyrolysis (MoHUA 2019). Fig. S2 of the\nsupplementary material shows the chemical valorization of\nwaste plastics. Although, cost and catalyst reuse capability in pyrolysis processes need further investigation (TERI\n2020). Due to high energy requirements and the low price of\npetrochemical feedstock compared to monomers developed\nfrom waste plastics, chemical recycling is not yet common\nat an industry scale (Schandl et al. 2020).\nProcessing of mixed waste remains a difficult task due to\nthe intricacy in the reactions where different types of polymers reflect completely distinct spectra following degradation pathways (Ragaert et al. 2017). The presence of PVC in\nthe waste stream possesses another problem due to its density and removal of hydrochloric acid (HCl) from products\nand thus resulting in incomplete segregation (Ragaert et al.\n2017). Other than this, lack of stable waste supply, suitable\nreactor technology, and presence of inorganics in the waste\nstream possess challenges in the chemical recycling of the\nplastics (Payne et al. 2019). Lack of investments, production\nof by-products and metal-based catalysts systems contribute\nto other significant difficulties in the chemical valorization\nof waste plastics (Cabanes et al. 2020; Kubowicz and Booth\n2017).\n\n**Depolymerization** Depolymerization of the plastics is\nthe result of chemical processing where various monomer\nunits are recovered which can be reused for the production\nof new plastics manufacturing or conversion into their raw\nmonomeric forms through processes such as hydrolysis,\nglycolysis, and alcoholysis (Bhandari et al. 2021; Mohanty\net al. 2021). This process is often used to recover monomers from a recoverable resin's grade to that of virgin resin\nsuch as PET, polyamides such as nylons, and polyurethanes\nwith excellent results, as well as the possibility to restore a\nsignificant resource from commodities that are difficult to\n\n## 1 3\n\n\nrecycle commercially (MoHUA 2019). This is the process\nby which the plastic polymers are converted into sulfur-free\nliquid power sources through chemical recycling where\nthese power sources facilitate energy recovery from PWs\n(Bhandari et al. 2021). According to the studies carried out\non depolymerization of mixed waste plastics, it has been\nreported that even a small quantity, for instance, 1 mg of\nthese plastics can yield 4.5 to 5.9 cal of energy with a little\namount of energy consumption of 0.8–1 kWh/h and therefore, this process can yield additional convenience for the\nhigh-quality recycling which is recently being used for the\nPET (Bhandari et al. 2021; Ellen MacArthur Foundation\n2017; Wołosiewicz-Głąb et al. 2017). In the anoxic conditions and the presence of specific catalytic additives, the\ndepolymerization is accomplished in a specially modified\nreactor where 350 °C is the highest reaction temperature\nwhich is converted to either liquid RDF or different gases\n(reutilized as fuel) and solids (reutilized as fuel in cement\nkilns) (MoHUA 2019).\n\n**Energy recovery** Gasification of PW is performed via reaction with a gasifying agent (e.g., steam, oxygen, and air) at\nhigh temperatures (approximately 500–1300 °C) to produce\nsynthetic gas or syngas. This can subsequently be utilized\nfor the production of many products, or as fuel to generate electricity, with outputs of a gaseous mixture of carbon\nmonoxide (CO), hydrogen (H2), carbon dioxide (CO2),\nand methane (CH4) via partial oxidation (Heidenreich and\nFoscolo 2015; Saebea et al. 2020). The amount of energy\nderived from this process is affected by the calorific input of\nPW where polyolefins tend to display higher calorific values. Table 3 shows calorific values of various plastic polymers and conventional fuels for comparison. Due to flexibil\n**Table 3 The calorific value of popular plastics and conventional fuels**\n(Zhang et al. 2021)\n\nFuel Calorific\nvalue (MJ/\nkg)\n\nPolyethylene 43.3–47.7\nPolypropylene 42.6–46.5\nPolystyrene 41.6–43.7\nPolyvinyl chloride 18.0–19.0\nPolyethylene terephthalate 21.6–24.2\nPolyamide 31.4\nPolyurethane foam 31.6\nMethane 53\nGasoline 46\nKerosene 46.5\nPetroleum 42.3\nHeavy oil 42.5\nHousehold plastic solid waste mixture 31.8\n\n\n-----\n\nity, robustness, and advantageous economics, gasification\nalong with pyrolysis is a leading technology for chemical\nrecycling. Characterization of PW is essential for developing optimal process design, particularly for HDPE, LDPE,\nPP, PS, PVC, and PET (Dogu et al. 2021). CSIR-IIP, India\n(Council of Scientific and Industrial Research-Indian Institute of Petroleum) and GAIL, India (Gas Authority of India\nLtd.) in collaboration, have been successful in producing\nfuel and chemicals from PW where PE and PP plastics have\nbeen converted to diesel, petrochemicals, and gasoline. 1 kg\nof these plastics can yield 850 ml of diesel, 500 ml of petrochemicals, and 700 ml of gasoline, along with LPG (CSIRIIP 2018) where the process ensures 100% conversion with\nno toxic emissions and is suitable for both small- and largescale industries (CSIR-IIP 2018).\n\n**Biological recycling**\n\nBiological recycling or organic recycling involves the breaking of PW with the intervention of microorganisms such as\nbacteria, fungus, or algae to produce biogas (CO2 for aerobic\nprocesses and CH4 for anaerobic processes). PW may be\nrecycled biologically through two methods namely aerobic\ncomposting and anaerobic digestion (Singh and Ruj 2015).\nAn enzymatic approach for biodegradation of PET is considered an economically viable recycling method (Koshti et al.\n2018). Table S1 in the supplementary data shows microorganisms responsible for the PW degradation process which\ncould be utilized in the biological recycling process. Blank\net al. 2020 reported that non-degradable plastics such as\nPET, polyethylene (PE), and polystyrene (PS) can be converted to biodegradable components such as polyhydroxyalkanoates (PHA) using a combination of pyrolysis and\nmicrobiology, which is an unconventional route to a circular\neconomy. Polyaromatic hydrocarbons, polyhydroxy valerate\n(PHV) and polyhydroxyalkanoate (PHH), polylactide (PLA),\nand other aliphatic polyesters are biodegradable, whereas\nmany aromatic polyesters are highly impervious to microbial\nassault (Singh and Ruj 2015). Fig. S3 of supplementary data\nshows an overview of the biodegradation of plastics.\nOxo-degradable plastics which is one of the major classes\nof bioplastics that possess challenges due to rapid breakage\ninto microplastics when conditions (sunlight and oxygen)\nare favorable (Kubowicz and Booth 2017). The behavior of\nspecific polymers interrupts their degradation into monomers due to which the microbial activity is ineffective for\nnon-hydrolyzable manufactured polymers as the activity of\nthe microorganisms responsible for the degradation differs\nconcerning the environmental conditions (Ali et al. 2021).\nOther challenges include the consumption of energy for\nrecycling and time for degradation of the generated microplastics along with socioeconomic challenges such as more\ntime and capital investment and lack of resources (Kubowicz\n\n\nand Booth 2017). Collection and separation of bio-PW and\na lack of effective policy contribute to some other barriers\nrelated to bio-based polymers and recycling.\n\n### Techno‑economic feasibility of different recycling techniques\n\nThe techno-economic feasibility study provides a medium\nto analyze the utilization (raw materials, resources, energy,\netc.) and end-of-life trail for different recovery pathways\nfor the conversion of PW by qualitative and quantitative\napproaches in technical and financial aspects (Briassoulis\net al. 2021a). The association of technical and economic\nprospects of reprocessing technologies and related products’\nmarket tends to have a compelling impact on the formation\nof policies to reduce PW. Hence, the techno-economic feasibility study is essential for the effective management of\nPW. The disparity in melting points and treatment technologies contributes to the major challenge for the recycling of\nmixed/multilayered plastic packaging waste which affects\nthe quality of the recycled product (Larrain et al. 2021).\nTable 4 shows different parameters for techno-economic\nfeasibility for recycling technologies. Though techno-economic feasibility study facilitates the understanding inadequacy prevails in terms of sustainability. This is overcome\nby Techno-Economic Sustainability Analysis (TESA) which\nstudies alternative methods for feedstock alteration, common\nenvironmental criteria (such as mass recovery efficiency, the\nimpact of additives, and emissions from recycling facility),\nand pathways for recycling and end-of-life of plastic products (Briassoulis et al. 2021b).\n\n### Utilization of PW and recycled products in India and contribution of major players toward plastic sustainability\n\nPost-consumer PW can be utilized to produce several products after recycling, such as laying roads, use in cement\nkilns, pavement blocks, tiles, bricks, boards, and clothes.\nDue to good binding properties, when PW is in a hightemperature molten state, it can be utilized in road laying (Rokade 2012). Mixing PP and LDPE in bituminous\nconcrete significantly increases the durability and fatigue\nresistance of roads (Bhattacharya et al. 2018). Various\nindustries based in different locations of the country utilizes PP, HDPE, and LDPE waste plastics to produce reprocessed granules and further use them in the production of\nchairs, benches, dustbins, flowerpots, plastic pellets, mobile\nstands, etc. Few informal recyclers produce eco-friendly\nt-shirts and napkins from PET waste bottles whereas some\nrecyclers convert PW to office accessories, furniture, and\n\n## 1 3\n\n\n-----\n\n**Table 4 Techno-economic feasibility parameters for recycling technologies (Briassoulis et al. 2021a; CSE 2021; ElQuliti 2016; Fivga and Dimi-**\ntriou 2018; Ghodrat et al. 2019; Larrain et al. 2021; NITI Aayog- UNDP 2021; Singh and Ruj 2015; Volk et al. 2021)\n\nFeasibility parameters Mechanical Chemical Biological for bioplastic\n\n\nTECHNOLOGICAL Type of polymer PET, HDPE, LDPE, PET, PP, PVC, PE, PS,\nlaminated plastics, lowquality mixed plastics\n\nEnergy requirements 300–500 kW/month for 1200–1500 kW for\n30–50 tonnes/month 80–100 kg PW/hour\n(depends on type of technology and polymer type)\n\nTemperature requirement 100–250 °C Pyrolysis—300–900 °C\nPlasma pyrolysis—1730–9730 °C\nGasification—500–1300 °C\n\n\nBio-PET, bio-PE, bio-PP, etc.\n\n40 TJ–1500 TJ (terajoule)\n\n130–150 °C\n\n\nBiodegradability Non-biodegradable Non-biodegradable Mostly biodegradable (PHA,\nPHV, PHH, PLA)\nRaw materials cost Rs. 6–40/kg Rs. 6–40/kg Rs. 10–30/kg\nECONOMICAL Quality of processed materi- Depending on polymer type Depend on type of technol- High-quality compostable\nals ogy and polymer type bio-polymer\nCost of recyclates Rs. 20–150/kg (depends on Rs. 20–40/l (diesel/fuel) Oxo-degradable plastics—Rs.\ntype of polymers and qual- 90–120/kg Biodegradable\nity of recycled products) films/bags—Rs. 400–500/kg\n\nRecycling facilities in India 7000–10,000 15–25 5–10\n(units)\n\nCost requirements (Operat- 50–60 lakhs/annum 50–65 lakhs for 1 TPD 1–2 crores/annum\ning and capital costs) (tonnes per day) plant\n\n\ndecorative garden items. Recycle India Hyderabad, in 2015,\nbuilt houses, shelter bus stops, and water tanks with PW bottles. Further, under this initiative, thousands of chips packets\nwere weaved into ropes, tied to metal frames, and used to\ncreate dining tables. Shayna Ecounified Ltd., Delhi, with the\nCSIR-National Physical Laboratory, Delhi, converted 340\ntonnes of HDPE, LDPE, and PP waste plastics to 11 lakh\ntiles and has commercialized them to other cities such as\nHyderabad, and companies such as L’Oréal International\nand Tata Motors. Further, few recyclers convert PW such as\nmilk pouches, oil containers, shower curtains, and household plastics to poly-fuel (a mixture of diesel, petrol, etc.).\nFew of them collect PET waste and recycle it into clothes,\nautomotive parts, battery cases, cans, carpets, etc. There are\nseveral other non-government organizations (NGOs), companies, and start-ups that are involved in the recycling of PW\nand its conversion to different types of products, even after\npost-consumer use.\nUsing shredded PW, in 2015–16, the National Rural\nRoad Development Agency laid around 7,500 km of roads\nin India. In 2002, Jambulingam Street in Chennai was constructed as the first plastic road in India (TERI 2018). Plastic\nfibers can replace common steel fibers for reinforcement.\nFire-retardant composites with a wide scope of applications\ncould be developed by blending recycled plastics with fly\nash (TERI 2020). HDPE, PVC, LDPE, PP, and PS have\n\n## 1 3\n\n\nyielded conflicting performance measures, which require\nfurther investigation into the performance of the pavement,\nmethods of improving compatibilization between plastic and\nasphalt, and economic and environmental implications of\nthe process.\nFor the reduction in packing, costs and rising issues\nrelated to PW and packaging, FMCGs (fast-moving consumer goods) industries have teamed up with the Packaging\nAssociation of Clean Environment (PACE), have primarily emphasized immediate benefits including a reduction in\nsize and resource consumption where these changes have\npromoted the usage of flexible packaging and pouches over\nrigid packaging forms. Major FMCG companies like Hindustan Unilever (HUL), Nestlé, and P&G have assured that\nthey will reduce the use of virgin plastics in packaging to\nhalf the amount by the year 2025 (PRI 2021). To promote\nthe utilization of recycled plastics, HUL incorporated recycled PET and recycled HDPE in the manufacturing of personal care products (Condillac and Laul 2020). Other companies like L’Oréal and Henkel had successfully eliminated\nPVC in 2018 along with the reduced use of cellophane to\n5.5% in 2019 and reduction in the utilization of carbon black\npackaging to make carbon-free toilet cleaners, respectively\n(PRI 2021). Beverage companies like PepsiCo, Coca-Cola\nIndia, and Bisleri which use a large quantity of PET bottles,\nhave collaborated with several recyclers to upcycle the PW\n\n\n-----\n\nproducts for the production of new recycled utilities such as\nclothes and bags (Condillac and Laul 2020). Similarly, other\ncompanies like Marico and Dabur are also actively involved\nin reducing the use of virgin plastics in its packaging and for\nthe implementation of a recycling initiative where Marico in\ncollaboration with Big Bazaar is providing incentives to the\ncustomers for dropping their used plastic bottles in the stores\nand Dabur is also competing in the race to become among\nfirst Indian FMCG company to be plastic-free (Condillac and\nLaul 2020). On the other side, apart from taking initiatives\nby various FMCG companies, a lot of efforts is being done\nfor the innovation toward plastic-free packaging materials\nand therefore, Manjushree Technopack (Bengaluru, India)\nlaunched its first plant for the production of post-consumer\nrecycled polymer up to 6000 metric tonnes/year to these\nindustries. Other than this, Packmile, a packaging company\nis producing no plastic alternative such as kraft paper (which\nis biodegradable and recyclable) for Amazon India (Condillac and Laul 2020).\n\n### Role of digitization in PW recycling\n\nAs the amount of waste is increasing by each successive\nyear, technology-driven methods can be established for\ncommunities to reduce, reuse and recycle PW in an ecofriendly manner. In light of this, Recykal (in south Indian\ncity Hyderabad), a digital technology firm developed an\nend-to-end, cloud-based fully automated digital solution\nfor efficient waste management by tracking waste collection\nand promoting recycling of non-biodegradable. Its services\nassist in the formation of a cross-value channel coalition and\nthe connection of various stakeholders such as waste generators (commercial and domestic users), waste collectors,\nand recyclers, assuring that transactions between the organizations with 100% transparency and accessibility (Bhadra\nand Mishra 2021). The quantities of waste received per day\nhave risen from 20 to 30 kg in the months following to over\n10,000 to 15,000 kg recently and offer incentives based on\nthe quality of recycled products (Bhadra and Mishra 2021).\nOne such Android-based application is proposed and developed by Singhal et al. (2021), for efficient collection by pickup or drop facility incorporated in the software. Segregation,\nas well as methods for recycling different types of plastics,\nare also suggested and in return, the users are rewarded with\nthe e-coupons accordingly (Singhal et al. 2021).\nFor improvement in plastic recycling, a variety of techniques have been used and blockchain is one among them,\nand it holds promise for enhancing plastic recycling and the\ncircular economy (CE). A distributed ledger, or blockchain,\nis made up of certain immutable ordered blocks which prove\nto be an excellent approach to commence all of their customers' transactions under the same technology (Khadke et al.\n\n\n2021). One such approach is the introduction of Swachhcoin for the management of household and industrial waste,\nand their conversion into usable high-value recoverable\ngoods such as paper, steel, wood, metals, and electricity\nwith efficient and environmentally friendly technologies\n(Gopalakrishnan and Ramaguru 2019). This is a Decentralised Autonomous Organization (DAO) that is controlled unilaterally via blockchain networks which utilize a combination of techniques such as multi-sensor driven AI to establish\nan incremental and iterative chain that relies on information\ntransferred between multiple ecosystem players, analyzes\nthese inputs, and offers significant recommendations based\non descriptive algorithms which will eventually make the\nsystem entirely self-contained, economical, and profitable\n(Gopalakrishnan and Ramaguru 2019). The purpose of AI in\nthis multi-sensor infrastructure purpose is to limit unpredictability and facilitate efficient and reliable separation by training the system to identify and distinguish them appropriately\n(Chidepatil et al. 2020). Most businesses favor blockchain\ntechnology because of its decentralized architecture and low\ntrading costs along with the associated benefits of accessibility, availability, and tamper-proof structures (Khadke et al.\n2021; Wong et al. 2021).\n\n### Discussion\n\nIndia is a major player in global plastic production and manufacturing. Technology, current infrastructure, and upcoming strategies by the Indian government are combined to\nprovide detailed suggestions for policymakers and researchers in the area of achieving a circular economy. The most\nimportant barrier in Indian PW management is the lack of\nsource segregation of the waste. As in many other countries, mechanical recycling is the leading recycling route for\nIndia’s rigid plastics. The influence of thermomechanical\ndeterioration should be avoided to get high-quality recycled\nmaterial with acceptable characteristics. The development\nof advanced quality measurement techniques for technology\nsuch as nondestructive, cost-effective methods to assess the\nchemical structure and mechanical performance could be\nkey to overcoming the obstructions. For instance, the performance of MR can be partially improved through simple\npackaging design improvements, such as the use of a single polymer instead of a multilayer structure. Furthermore,\nPS and PVC could be replaced with PP for the packaging\nfilm market. There are also issues with depolymerization\nselectivity and activity, ability, and performance trade-offs\nthat may need to be addressed before these methods have\nwide applicability. Based on our assessments, Indian policymakers should consider PET, polyamide 6 (PA 6), thermosetting resins, multilayer plastic packaging, PE, PS, PP,\nand fiber-reinforced composites for chemical recycling.\n\n## 1 3\n\n\n-----\n\nAs chemical recycling is innovation-intensive, assessing\neconomic feasibility is the main challenge for developing\ncountries like India. Overall, PUR, nylon, and PET appear\nmost competitive for chemical recycling. The more problematic mixed waste streams from multilayer packaging could\nbe more suited for pyrolysis along with PE, PP, PS, PTFE\n(polytetrafluoroethylene), PA, and PMMA (poly(methyl\nmethacrylate)). Substantial investment is required for\nhydrocracking which can deal with mixed plastics. Better\nguidance on the correct chemical recycling technology for\neach Indian PW stream may require technology readiness\nlevel (TRL) assessments as proposed by Solis and Silveira\n(2020), which require an increased number of projects and\ndata available on the (chemical) process optimization. Compared to conventional fossil fuel energy sources, PE, PP,\nand PS are the three main polymers with higher calorific\nvalue, making them suitable for energy production. There\nare some challenges, however, with this technology, such\nas the identification of specific optimal biodiesel product\nproperties which can be addressed using techniques such as\nLCA (life cycle assessment) and energy-based analysis. As\nthe practical module of the Indian PW management rules\nexplicitly shows the route to oil production from waste, this\nmay indicate a focus on this technology for the country in\nthe future as chemical recycling accounts for only 0.83%\n(as shown in Fig. 3b) among all the recycling technologies.\nAlthough a relatively high cost is associated with bio-polymers at present, it is expected that production costs will\nreduce due to economies of scale in the coming years. There\nare already numerous bioplastic food packaging materials\nin the market. Since food packaging constitutes a large portion of PW in India, a significant impact could be made for\nthe country if it is switched to more sustainable bio-based\npolymers. In India, the J&K Agro Industries Development\nCorporation Ltd, in collaboration with Earth soul, has\nintroduced the first bioplastic product manufacturing facility, with 960 tonnes per year production capacity whereas\nTruegreen (Ahmedabad) can manufacture 5000 tonnes per\nyear. Some of the major manufacturing plants in India are\nBiotech bags (Tamil Nadu), Ravi Industries (Maharashtra),\nEcolife (Chennai). Recently, plant-based bio-polymer has\nbeen introduced by an Indian company named Hi-Tech\nInternational (Ludhiana) to replace single-use and multi-use\nplastic products such as cups, bottles, and straws, which is\nIndia’s only compostable plastic which implies that plastics\nproduced from this bio-polymer will initiate its degeneration within 3–4 months and can completely disintegrate after\n6 months and also, a biodegradable plastic made is converted\nto carbon dioxide and the remaining constituents transforms\ninto water and biomass (Chowdhary 2021). However, there\nare several challenges associated with this technology.\nImprovements are required to sort bioplastic from other PW\ntypes to avoid waste stream contamination. There is also a\n\n## 1 3\n\n\nneed for optimization of anaerobic digestion parameters to\nensure the complete degradation of these materials. From\nthe Indian perspective, feedstock type with their respective\ninfrastructure availability and interactions between sustainability domains is critical for policymaking issues as most of\nthe recycling sectors are operated by informal sector workers. Commercialization of laboratory-based pyrolysis and\ngasification of bioplastic streams should be developed. Due\nto contaminated collection, there is limited recyclability in\nother PW streams, which should be considered as part of\nbio-based PW management. Though India recycles 60% of\nthe total waste generated and its recycling methods are quite\neffective in solving the problem of increasing PW in India,\nthere are still some major challenges or barriers linked with\nit. For more efficient management of all the PW produced,\nstakeholders need to understand and tackle the challenges\nfaced to curb plastic pollution in the country. Different types\nof recycling technologies have their respective associated\nchallenges and barriers (including technological and social)\nwhich need to be addressed as mentioned in Table S2 of the\nsupplementary data.\nRecycled plastics and the products made from these plastics are often expensive from the virgin plastics and therefore\ncompete for their place in the market. The reason behind this\nis the easy availability of raw materials (which are waste\nfrom the petroleum industry) for the production of virgin\nplastics. Other than this, even after mentioning that 60% of\nthe PW is being recycled, a massive amount of this waste\nis found littered and unrecycled in the environment which\ncontradicts the percentage of recycling as there is a lack of\nrelevant and accurate data for the same. Furthermore, Goods\nand Services Tax (GST) also plays a vital role to build market linkages between recycled and virgin products as the\navailability of recycled products is sporadic, the revenue\nor business model tends to collapse for these products and\naffects the recyclers if the PW is being exported where the\nGST rates decreased to 5% from 18% in 2017 (CSE 2021).\nThe increased input costs due to GST and customs taxes are\nbeing transferred to secondary waste collectors by lowering\nthe cost of recycled plastics. For instance, PET bottles were\nRs. 20/kg before GST came in which decreased to Rs. 12/\nkg after GST imposition, milk packets price varied from Rs\n12/kg to Rs 8/kg and similarly, the cost of HDPE dropped by\n30% post-GST (CSE 2021). With the introduction of GST in\nthe plastic value and supply chain, the informal sectors are\nfacing huge losses due to the availability of scrap at cheaper\ncosts. Therefore, the current GST structure has affected the\nmost fragile and vulnerable section of the plastic supply\nvalue chain.\nEnormous studies have been carried out related to different techniques for recycling for various types of polymers,\nvery limited research is available on the techno-economic\nfeasibility of these technologies and therefore, this could\n\n\n-----\n\nprovide a wide scope for the relevant research in India.\nOther than this feasibility study, there is a broad range of\nopportunities and possibilities to explore and analyze the\ntechnologies in India concerning sustainability (involving\nenvironmental and social parameters) through TESA.\nSeveral published reports claim that India recycles 60% of\nthe total PW generated annually which is the highest among\nother countries such as Germany and Austria with more than\n50% recycling. India’s recycling is mostly contributed by the\ninformal sectors but has not been documented accurately by\nthe governing bodies of the country. Moreover, information\non the recycling rate of 60% varies with different sources\nand creates disparity and ambiguity of the data. As depicted\nin Fig. 3b, India recycles 94.17% of waste plastics through\nmechanical recycling, while 0.93% is chemical or feedstock\nrecycling and 5% for energy recovery and alternative uses\nsuch as making roads, boards, and tiles. Compared with\nchemical recycling, mechanical recycling is the most popular technique due to ease of operation and low-cost expenditure as compared to feedstock or chemical recycling in which\nhigh finances and operational costs are involved along with\nthe lack of availability to ascendable technology. Landfill\ndumping is sometimes favored due to improper segregation\nof waste and ease of operation by agencies employed by\nULBs. Other than mechanical and chemical recycling, bioplastics are the emerging alternative for PW in India but lag\ndue to improper legislation, high cost, and unawareness of\nthe segregation of these types of plastics. This can be facilitated if eco-labeling and a proper coding system are introduced. Though these recycling technologies are widely used\nfor reprocessing the PW, elimination of plastics from the\nenvironment is still a far-fetched dream and merely adds a\nfew more years into the end-of-life of the plastics. Therefore,\nthere is a need for affirmative legislation and strict guidelines for the use of recycled products and the exploration of\nalternatives in different sectors. Active involvement of the\ninformal sectors and inclusive growth can be ensured as their\nlivelihood is dependent on PW.\n\n### Conclusion\n\nThe circular economy is a regenerative model which requires\nthe participation of accountable stakeholders. There should\nbe continuous interaction among stakeholders to share current practices dealing with PW as part of the plastic economy. It was found that there was incomplete and indistinct\nreporting on PW generation from individual states. Information exchange via technology application should eventually\nbe an integral part of the PW management value chain. Thus,\ngeneration estimation is an essential task to set targets for\nresource recovery and recycling, which connects the “global\ncommitment” element of the circular plastic economy and\n\n\nwaste minimization. Being part of the global commitment\nto “reducing, circulating and innovating” under the “plastic pact,” a national target could be set and a mechanism is\ndeveloped. In setting a national target, the “dialogue mechanism” would further invigorate inter-and multidisciplinary\nresearch and policy directions. Consumer behavior is an\nessential task as the end-users share equal responsibilities\nas the producer circular economy. Waste management is\na complex multi-actor-based operational system built on\nknowledge, technologies, and experience from a range of\nsectors, including the informal sector. Indigenous innovation\nand research at a regional scale, such as in Gujarat, Andhra\nPradesh, and Kerala, has set an example of a circular plastic\neconomy and would help in developing a further regional\ncircular plastic economy. Efficient recycling of mixed PW\nis an emerging challenge in the Indian recycling sector. As\nplastic downcycling and recycling is an energy-intensive\nprocess, energy supply from renewable energy sources such\nas solar and wind energy can potentially reduce the CO2\nemissions produced. The recovery and recycling of substantial volumes of PW need emerging technological and\nspecialized equipment, which in turn necessitates a considerable capital investment. Informal sectors being prominent in\nwaste management may be deprived of recognition, technology, and scientific understanding but their skills, knowledge,\nand experience can be utilized in the value chain of plastic\nflow. Also, there is a need to formalize the informal sectors\nwith proper incentivization and other benefits as they play\na major role in plastic flow in India. Additionally, there are\nno policies or rules for the treatment of the residues from the\nresult of recycling technologies and their production units,\nwhich needs to be addressed as the number of waste residues\ndepends on the quantum of waste and technique incorporated. Universities, research organizations, and most importantly, polymer manufacturers and most important policymakers should collaborate in renewable energy integration\nand process optimization.\nFurther detailed assessment using LCA should be performed in this regard to identify the optimized solutions.\nExtended producer responsibility (EPR) and other policy\nmechanisms would be integrated sooner or later; however,\none of the fundamental aspects is being part of the circular economy. Although segmented, it is believed that the\ninformal sector is very innovative, and they could also be\ntechnologically enabled. New app development and PW\ncollection campaigns through digitalization could increase\nnon-contaminated sources of PW. Specific manufacturing\nsectors such as flexible packaging, automobiles, electrical,\nand electronics should look at the plastic problem through\nthe lens of resource efficiency and climate change (CO2 and\nGHGs) perspectives. The sectors should develop innovative solutions so that recycled plastics can be re-circulated\nwithin the sectors where they will be the leading consumer.\n\n## 1 3\n\n\n-----\n\nThough there are a lot of available data on different types\nof recycling of plastics and the state-wise flow of plastics\nthere is no proper information on different types of plastic polymers and their respective flow in the value chain in\ndifferent states/UTs. There is a need for the fortification of\nrecycling different technologies for different polymers and\nfor this purpose, the multi-sensor-based AI and blockchain\ntechnology can prove effective in segregation and recycling\nof the PW in a more environmentally friendly manner which\nshould be implemented in all parts of the country for efficient PW management. Furthermore, the amount of PW can\nonly be controlled by the replacement of new virgin plastics\nand existing plastics with the desired recycled plastics along\nwith citizen sensitization. Overall, for a circular plastic economy in India, there is a necessity for a technology-enabled,\naccountable quality-assured collaborative supply chain of\nvirgin and recycled material.\n\n**Supplementary Information The online version contains supplemen-**\n[tary material available at https://doi.org/10.1007/s13762-022-04079-x.](https://doi.org/10.1007/s13762-022-04079-x)\n\n**Acknowledgments The authors wish to thank all who assisted in con-**\nducting this work.\n\n**Author contributions All the authors contributed to the study concep-**\ntion and design. Conceptualization and writing of the draft were done\nby Riya Shanker, Dr. Debishree Khan, Dr. Rumana Hossain, Anirban\nGhose, and Md Tasbirul Islam. The draft was revised and edited by\nKatherine Locock with the supervision of Dr. Heinz Schandl, Dr. Rita\nDhodapkar, and Dr. Veena Sahajwalla. All the authors have read and\napproved the final manuscript.\n\n**Funding The authors acknowledge project funding for “India – Aus-**\ntralia Industry and Research\nCollaboration for Reducing Plastic Waste” from CSIRO, Australia,\nthrough contract agreement.\n\n#### Declarations\n\n**Conflict of interest The authors declared that they have no conflict of**\ninterest.\n\n**Ethical approval There is no ethical approval required.**\n\n### References\n\nAl-Salem SM, Antelava A, Constantinou A, Manos G, Dutta A (2017)\nA review on thermal and catalytic pyrolysis of plastic solid waste\n[(PSW). J Environ Manag 197:177–198. https://doi.org/10.1016/j.](https://doi.org/10.1016/j.jenvman.2017.03.084)\n[jenvman.2017.03.084](https://doi.org/10.1016/j.jenvman.2017.03.084)\n\nAl-Salem SM, Lettieri P, Baeyens J (2010) The valorization of plastic solid waste (PSW) by primary to quaternary routes: From\nre-use to energy and chemicals. 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Retrieved\n[from https://ppcb.punjab.gov.in/Attachments/Plastic%20Waste/](https://ppcb.punjab.gov.in/Attachments/Plastic%20Waste/PlasticCPCB.pdf)\n[PlasticCPCB.pdf](https://ppcb.punjab.gov.in/Attachments/Plastic%20Waste/PlasticCPCB.pdf)\n\nRafey A, Siddiqui FZ (2021) A review of PW management in India—\n[challenges and opportunities. Int J Environ Anal Chem. https://](https://doi.org/10.1080/03067319.2021.1917560)\n[doi.org/10.1080/03067319.2021.1917560](https://doi.org/10.1080/03067319.2021.1917560)\n\nRagaert K, Delva L, Van Geem K (2017) Mechanical and chemical\n[recycling of solid PW. Waste Manag 69:24–58. https://doi.org/](https://doi.org/10.1016/j.wasman.2017.07.044)\n[10.1016/j.wasman.2017.07.044](https://doi.org/10.1016/j.wasman.2017.07.044)\n\nRokade S (2012) Use of waste plastic and waste rubber tyres in flexible highway pavements. In: International conference on future\nenvironment and energy, IPCBEE, vol 28\nSaebea D, Ruengrit P, Arpornwichanop A, Patcharavorachot Y (2020)\nGasification of PW for synthesis gas production. Energy Rep\n[6:202–207. https://doi.org/10.1016/j.egyr.2019.08.043](https://doi.org/10.1016/j.egyr.2019.08.043)\n\nSatapathy S (2017) An analysis of barriers for plastic recycling in the\nIndian plastic industry. Benchmark Int J 24(2):415–430\nSchandl H, King S, Walton A, Kaksonen AH, Tapsuwan S, Baynes\nTM (2020) National circular economy roadmap for plastics, glass,\npaper and tyres. Australia’s National Science Agency, CSIRO,\nAustralia\nSikdar S, Siddaiah A, Menezes PL (2020) Conversion of waste plastic\n[to oils for tribological applications. Lubricants 8(8):78. https://](https://doi.org/10.3390/lubricants8080078)\n[doi.org/10.3390/lubricants8080078](https://doi.org/10.3390/lubricants8080078)\n\nSingh RK, Ruj B (2015) PW management and disposal techniques[Indian scenario. Int J Plast Technol 19(2):211–226. https://doi.](https://doi.org/10.1007/s12588-015-9120-5)\n[org/10.1007/s12588-015-9120-5](https://doi.org/10.1007/s12588-015-9120-5)\n\nSinghal S, Singhal S, Neha, Jamal M (2021) Recognizing &automating the barriers of plastic waste management – collection and\nsegregation 8(4):775–779\nSolis M, Silveira S (2020) Technologies for chemical recycling of\nhousehold plastics—a technical review and TRL assessment.\n[Waste Manag 105:128–138. https://doi.org/10.1016/j.wasman.](https://doi.org/10.1016/j.wasman.2020.01.038)\n[2020.01.038](https://doi.org/10.1016/j.wasman.2020.01.038)\n\nChowdhary S (2021) Biopolymers: smart solution for solving the PW\n[problem. Retrieved from https://www.financialexpress.com/indus](https://www.financialexpress.com/industry/bio-polymers-smart-solution-for-solving-the-plastic-waste-problem/2267620/)\n[try/bio-polymers-smart-solution-for-solving-the-plastic-waste-](https://www.financialexpress.com/industry/bio-polymers-smart-solution-for-solving-the-plastic-waste-problem/2267620/)\n[problem/2267620/.](https://www.financialexpress.com/industry/bio-polymers-smart-solution-for-solving-the-plastic-waste-problem/2267620/)\nTamil Nadu Pollution Control Board (2020) Annual report on PW\n[management rules, 2016. Retrieved from https://tnpcb.gov.in/](https://tnpcb.gov.in/pdf_2019/AnnualRptPlasticwaste1920.pdf)\n[pdf_2019/AnnualRptPlasticwaste1920.pdf](https://tnpcb.gov.in/pdf_2019/AnnualRptPlasticwaste1920.pdf)\n\n## 1 3\n\n\nTelangana Pollution Control Board (2018) Annual report 2017–18.\n[Retrieved from https://tspcb.cgg.gov.in/CBIPMP/Plastic%20ann](https://tspcb.cgg.gov.in/CBIPMP/Plastic%20annual%20returns%202017-18.pdf)\n[ual%20returns%202017-18.pdf](https://tspcb.cgg.gov.in/CBIPMP/Plastic%20annual%20returns%202017-18.pdf)\n\nTERI (2020) PW management: turning challenges into opportunities.\n[Retrieved from https://www.teriin.org/sites/default/files/2020-12/](https://www.teriin.org/sites/default/files/2020-12/plastic-management_0.pdf)\n[plastic-management_0.pdf](https://www.teriin.org/sites/default/files/2020-12/plastic-management_0.pdf)\n\nTERI (2021) Circular Economy for plastics in India: A Roadmap.\n\n[https://www.teriin.org/sites/default/files/2021-12/Circular-Econo](https://www.teriin.org/sites/default/files/2021-12/Circular-Economy-Plastics-India-Roadmap.pdf)\n[my-Plastics-India-Roadmap.pdf](https://www.teriin.org/sites/default/files/2021-12/Circular-Economy-Plastics-India-Roadmap.pdf)\n\nTong Z, Ma G, Zhou D (2020) Simulating continuous counter-current\nleaching process for indirect mineral carbonation under microwave irradiation. J Solid Waste Technol Manag 46(1):123–131.\n[https://doi.org/10.5276/JSWTM/2020.123](https://doi.org/10.5276/JSWTM/2020.123)\n\nUttar Pradesh Pollution Control Board (2021) Annual report 2019–\n2020. Retrieved from [http://uppcb.com/pdf/Plastic-Annual_](http://uppcb.com/pdf/Plastic-Annual_090321.pdf)\n[090321.pdf](http://uppcb.com/pdf/Plastic-Annual_090321.pdf)\n\nUttarakhand Pollution Control Board (2019) Annual report 2018–2019.\nRetrieved from [https://ueppcb.uk.gov.in/files/annual_report_](https://ueppcb.uk.gov.in/files/annual_report_PWM.pdf)\n[PWM.pdf](https://ueppcb.uk.gov.in/files/annual_report_PWM.pdf)\n\nVolk R, Stallkamp C, Steins JJ, Yogish SP, Müller RC, Stapf D, Schultmann F (2021) Techno-economic assessment and comparison of\ndifferent plastic recycling pathways: a German case study. J Ind\n[Ecol. https://doi.org/10.1111/jiec.13145](https://doi.org/10.1111/jiec.13145)\n\nWBCSD (2017) Informal approaches towards a circular economy—\n[learning from the plastics recycling sector in India. https://www.](https://www.sustainable-recycling.org/wp-content/uploads/2017/01/WBCSD_2016_-InformalApproaches.pdf)\n[sustainable-recycling.org/wp-content/uploads/2017/01/WBCSD_](https://www.sustainable-recycling.org/wp-content/uploads/2017/01/WBCSD_2016_-InformalApproaches.pdf)\n[2016_-InformalApproaches.pdf](https://www.sustainable-recycling.org/wp-content/uploads/2017/01/WBCSD_2016_-InformalApproaches.pdf)\n\nWołosiewicz-Głąb M, Pięta P, Sas S, Grabowski Ł (2017) PW depolymerization as a source of energetic heating oils. In: E3S web of\n[conferences, vol 14. EDP Sciences, p 02044. https://doi.org/10.](https://doi.org/10.1051/e3sconf/20171402044)\n[1051/e3sconf/20171402044](https://doi.org/10.1051/e3sconf/20171402044)\n\nWong S, Yeung JKW, Lau YY, So J (2021) Technical sustainability\nof cloud-based blockchain integrated with machine learning for\n[supply chain management. Sustainability 13(15):8270. https://doi.](https://doi.org/10.3390/su13158270)\n[org/10.3390/su13158270](https://doi.org/10.3390/su13158270)\n\nZhang F, Zhao Y, Wang D, Yan M, Zhang J, Zhang P, Chen C (2021)\nCurrent technologies for PW treatment: a review. J Clean Prod\n[282:124523. https://doi.org/10.1016/j.jclepro.2020.124523](https://doi.org/10.1016/j.jclepro.2020.124523)\n\n\n-----\n\n" | Plastic waste recycling: existing Indian scenario and future opportunities | This review article aims to suggest recycling technological options in India and illustrates plastic recycling clusters and reprocessing infrastructure for plastic waste (PW) recycling in India. The study shows that a majority of states in India are engaged in recycling, road construction, and co-processing in cement k... | 2022.0 | 2022-04-02 00:00:00 | https://www.semanticscholar.org/paper/000523657fe1a5879d72c099f619ea0de4424bff | International Journal of Environmental Science and Technology | True |
000548b90449dad8f1aaa3207fa6b77503c1d2a3 | "# sensors\n\n_Article_\n## A Distributed and Secure Self-Sovereign-Based Framework for Systems of S(...TRUNCATED) | A Distributed and Secure Self-Sovereign-Based Framework for Systems of Systems | "Security and privacy are among the main challenges in the systems of systems. The distributed ledge(...TRUNCATED) | 2023.0 | 2023-09-01 00:00:00 | https://www.semanticscholar.org/paper/000548b90449dad8f1aaa3207fa6b77503c1d2a3 | Italian National Conference on Sensors | True |
000634d00e45d43a7abbc57c02bea6d663cb9232 | "http://www.biomedcentral.com/1471 2105/12/85\n\n## SOFTWARE Open Access\n\n# DecGPU: distributed er(...TRUNCATED) | "DecGPU: distributed error correction on massively parallel graphics processing units using CUDA and(...TRUNCATED) | "BackgroundNext-generation sequencing technologies have led to the high-throughput production of seq(...TRUNCATED) | 2011.0 | 2011-03-29 00:00:00 | https://www.semanticscholar.org/paper/000634d00e45d43a7abbc57c02bea6d663cb9232 | BMC Bioinformatics | True |
000c351ffff4b7379817bf6a9c73c4d3617a1395 | "# sensors\n\n_Article_\n### A Proof of Concept of a Mobile Health Application to Support Profession(...TRUNCATED) | "A Proof of Concept of a Mobile Health Application to Support Professionals in a Portuguese Nursing (...TRUNCATED) | "Over the past few years, the rapidly aging population has been posing several challenges to healthc(...TRUNCATED) | 2019.0 | 2019-09-01 00:00:00 | https://www.semanticscholar.org/paper/000c351ffff4b7379817bf6a9c73c4d3617a1395 | Italian National Conference on Sensors | True |
0010110e322b5ed622e9a57ff2aed1b092b3cf9e | "## sustainability\n\n_Article_\n# An Attribute-Based Access Control for IoT Using Blockchain and Sm(...TRUNCATED) | An Attribute-Based Access Control for IoT Using Blockchain and Smart Contracts | "With opportunities brought by the Internet of Things (IoT), it is quite a challenge to maintain con(...TRUNCATED) | 2021.0 | 2021-09-23 00:00:00 | https://www.semanticscholar.org/paper/0010110e322b5ed622e9a57ff2aed1b092b3cf9e | Sustainability | True |
00112bc246d0ad07bf4c6ce0c2ec39f30c3015ca | "Hindawi\nInternational Journal of Genomics\nVolume 2021, Article ID 3102399, 14 pages\n[https://doi(...TRUNCATED) | "Genome-Wide Analysis of the Auxin/Indoleacetic Acid Gene Family and Response to Indole-3-Acetic Aci(...TRUNCATED) | "Auxin/indoleacetic acid (Aux/IAA) family genes respond to the hormone auxin, which have been implic(...TRUNCATED) | 2021.0 | 2021-10-26 00:00:00 | https://www.semanticscholar.org/paper/00112bc246d0ad07bf4c6ce0c2ec39f30c3015ca | International Journal of Genomics | True |
00159a43bf50d7133c490a38339afdd626c5a975 | "Received August 18, 2020, accepted August 31, 2020, date of publication September 3, 2020, date of (...TRUNCATED) | HPBS: A Hybrid Proxy Based Authentication Scheme in VANETs | "As a part of intelligent transportation, vehicle ad hoc networks (VANETs) have attracted the attent(...TRUNCATED) | 2020.0 | NaT | https://www.semanticscholar.org/paper/00159a43bf50d7133c490a38339afdd626c5a975 | IEEE Access | True |
00183d0d30904451be10a8ec7ceb6edf4a8f3637 | "# Decentralized Hypothesis Testing in Wireless Sensor Networks in the Presence of Misbehaving Nodes(...TRUNCATED) | Decentralized Hypothesis Testing in Wireless Sensor Networks in the Presence of Misbehaving Nodes | 2013.0 | NaT | https://www.semanticscholar.org/paper/00183d0d30904451be10a8ec7ceb6edf4a8f3637 | IEEE Transactions on Information Forensics and Security | True |
DLT-Scientific-Literature
Dataset Description
Dataset Summary
DLT-Scientific-Literature is a specialized corpus of academic publications focused on Distributed Ledger Technology (DLT). This dataset is part of the larger DLT-Corpus collection, designed to support NLP research, language model development, and innovation studies in the DLT domain.
The dataset contains 37,440 scientific documents with 564 million tokens, spanning publications from 1978 to 2025. All documents are in English and have been filtered for domain relevance using a fine-tuned BERT model.
This dataset is part of the DLT-Corpus collection. For the complete corpus including patents and social media data, see: https://huggingface.co/collections/ExponentialScience/dlt-corpus-68e44e40d4e7a3bd7a224402
Languages
English (en)
Dataset Structure
Data Fields
The dataset includes the following fields for each document:
- paperId: Unique identifier from Semantic Scholar
- title: Title of the scientific publication
- authors: List of authors
- year: Publication year
- publicationDate: Full publication date
- venue: Publication venue (journal, conference, etc.)
- publicationVenue: Detailed venue information
- publicationTypes: Type of publication (e.g., JournalArticle, Conference)
- abstract: Abstract of the publication
- text: Full text content in Markdown format
- url: URL to the source document
- openAccessPdf: Link to open access PDF if available
- isOpenAccess: Boolean indicating open access status
- fieldsOfStudy: Academic fields associated with the paper
- s2FieldsOfStudy: Semantic Scholar's field classifications
- references: List of referenced papers
- lang: Language code
- lang_conf: Confidence score for language detection
- tok_len: Token length of the document
- total_tokens: Total number of tokens
Data Splits
This is a single corpus without predefined splits. Users should create their own train/validation/test splits based on their specific research needs.
Dataset Creation
Curation Rationale
DLT-Scientific-Literature was created to address the lack of large-scale, domain-specific text corpora for NLP and computational research in the Distributed Ledger Technology field. The dataset enables researchers to:
- Develop DLT-specific language models and embeddings
- Conduct innovation studies and trend analysis
- Perform text mining on cutting-edge DLT research
- Study the evolution of concepts and terminology in the field
Source Data
Data Collection
Scientific literature was collected from the Semantic Scholar API using domain-specific queries related to blockchain, distributed ledgers, cryptocurrencies, smart contracts, and related technologies.
Data Processing
The collection process involved:
- Query-based retrieval: Using targeted keywords to retrieve relevant publications
- PDF parsing: Converting PDF documents to Markdown format
- Language detection: Filtering for English-language documents
- Length filtering: Removing documents that are too short or too long
- Domain relevance filtering: Using a fine-tuned BERT model to ensure documents are relevant to DLT
Personal and Sensitive Information
This dataset contains only publicly available scientific literature. No personal or confidential data is included. Author names and affiliations are retained as they appear in the original publications, as this is standard academic practice.
Considerations for Using the Data
Discussion of Biases
Potential biases include:
- Geographic bias: Publications may be skewed toward institutions in certain countries
- Language bias: Only English-language publications are included
- Temporal bias: More recent years may have disproportionately more publications
- Venue bias: Certain journals or conferences may be over-represented
- Citation bias: Highly-cited papers may be more likely to be included
Other Known Limitations
- Temporal coverage: While the dataset spans 1978-2025, the distribution is uneven with more recent years heavily represented
- Access limitations: Some publications may be missing due to access restrictions or API limitations
- Quality variation: Academic writing quality and rigor vary across publications
- Parsing errors: PDF-to-Markdown conversion may introduce formatting issues in some documents
Additional Information
Dataset Curators
Walter Hernandez Cruz, Peter Devine, Nikhil Vadgama, Paolo Tasca, Jiahua Xu
Licensing Information
Mixed open-access licenses including:
- Creative Commons Attribution (CC-BY)
- Creative Commons Attribution-ShareAlike (CC-BY-SA)
- Creative Commons Zero (CC0)
- Other permissive open-access licenses
Individual license information is included in the metadata for each document where available. Users should check the specific license for each document before use.
Citation Information
@misc{hernandez2026dlt-corpus,
title={DLT-Corpus: A Large-Scale Text Collection for the Distributed Ledger Technology Domain},
author={Walter Hernandez Cruz and Peter Devine and Nikhil Vadgama and Paolo Tasca and Jiahua Xu},
year={2026},
eprint={2602.22045},
archivePrefix={arXiv},
primaryClass={cs.CL},
url={https://arxiv.org/abs/2602.22045},
}
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