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Which of the following is not generated in waste treatment processes?

(a) Sludge

(b) Ash

(c) Organic solvents

(d) Noise

I have been asked this question during an interview.

Question is from Treatment of Hazardous Wastes in section Biotechnology for Solid Waste Management of Environmental Biotechnology

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Best answer
The correct choice is (d) Noise

The best explanation: Noise is not a waste that is generated in the waste treatment processes as it is a sound which affects the environment but physically doesn’t. And it is not generated in waste treatment processes. Whereas, sludge, ash, organic solvents are generated during various processes like incineration, wet scrubbers, distillation etc. These are generated in waste treatment processes and can be a serious threat to the environment if not disposed of properly.

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