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Which of following physical methods cannot be used for treatment of waste water?

(a) Sedimentation

(b) Floatation

(c) Filtration

(d) Chlorination

I got this question in examination.

This interesting question is from Microbial Biofilm and Wastewater Treatment topic in portion Biological Treatment of Waste Water of Environmental Biotechnology

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Best answer
The correct option is (d) Chlorination

Explanation: Chlorination is a chemical process used for treatment of water whereas sedimentation, floatation, filtration is a physical method for waste water treatment.

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