<p>The company I work for is protective of IP and has security procedures for disposing of anything that could be stolen for industrial espionage.  Paper gets shredded and sent to trusted recycling center, all old data storage media gets obliterated, but what do we do with 3D prints?  For any functional prototype, I have 10 or more early versions and failed prints.  Is there a good way to dispose of these so that they are unrecognizable?  Given the volume of prints I need to dispose of, it should be safe, cheap, and able to handle large batches.</p>

If your company has a shredder which would handle large amounts of paper at one time, it should be able to handle the plastics from 3D printing. Most larger shredders can handle paper clips and staples. 3D plastics would be even less of a burden than them. You may need to break the pieces down into smaller chunks, but I doubt it would be an issue. Even destroying most prints by hand shouldn't be too arduous.
Secondarily, you could also melt them using something hot ... a heat gun would probably do the job without issue.
They get in excess of 1100°F
. Since we
usually
melt filament at around 200°C (~392°F), a heat gun should be more than hot enough to make it an unrecognizable blob of plastic.