Which of the following is an exempt recyclable hazardous waste according to the material?

• A. Waste-derived fuels from refining processes
• B. Industrial ethyl alcohol
• C. Scrap metal
• D. Waste from manufactured gas plants

Answer: (D)

Exempt recyclable hazardous wastes are those that are hazardous in origin but aren’t regulated as hazardous waste when they are legitimately recycled back into production. Waste from manufactured gas plants is treated this way because it’s routinely reclaimed to recover useful chemicals and energy, and it’s recycled back into the process rather than disposed of. That reclamation pathway fits the idea of an exempt recyclable—the material is handled as a feedstock or energy source rather than as disposed hazardous waste, so it carries the exemption when recycled under the right conditions.

The other options don’t fit this exemption in the same way. Waste-derived fuels from refining processes are typically managed under hazardous waste rules unless a specific fuel-exemption applies, rather than being identified as an exempt recyclable waste. Industrial ethyl alcohol is usually a product or solvent rather than a recyclable hazardous waste, and scrap metal is generally considered a recyclable material rather than a hazardous waste, unless it is contaminated to a level that triggers hazardous-waste rules.