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By which process, odour producing substances is oxidized?

(a) Chlorination

(b) Liming

(c) Re-carbonation

(d) Super-chlorination

I have been asked this question by my school teacher while I was bunking the class.

The above asked question is from Various Unit Operations in chapter Unit Operations, Screening and Aeration of Environmental Engineering

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Right option is (d) Super-chlorination

To explain: By addition of chlorine dioxide to water, odour producing substances are oxidized.

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