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Which of the following is not a major concern in waste treatment processes?

(a) Sludge

(b) Ash

(c) Organic solvents

(d) Noise

The question was asked in examination.

Origin of the question is Microbial Transformations of Pesticides in portion Microbial Transformations of Pesticides of Environmental Biotechnology

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Right choice is (d) Noise

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, so, it’s not a major concern. 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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