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Which of the following steps is not followed during the treatment of wastewater?

(a) Floatation and fat separation

(b) Mixing

(c) Activated sludge system

(d) Pasteurization

This question was posed to me in my homework.

I'd like to ask this question from Wastewater Treatment in portion Wastewater Treatment of Food Processing Industries of Environmental Biotechnology

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Right answer is (d) Pasteurization

Easiest explanation: Pasteurization is followed during the initial treatment of waste water from dairy industry for decreasing the microbial load in the milk by exposing the it to higher temperatures, Floatation and fat separation is the first step which is followed by Mixing where carbon dioxide is removed and Activated sludge system leads to BOD reduction.

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