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Which of the following activated sludge process has minimum food to microorganism ratio?

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Which of the following activated sludge process has minimum food to microorganism ratio?

(a) Extended aeration

(b) Step aeration

(c) Modified aeration

(d) Conventional

I had been asked this question during a job interview.

Question is taken from Design of Activated Sludge Plant topic in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
Correct option is (a) Extended aeration

Explanation: Extended aeration process has minimum food to microorganism ratio of 0.5 which means it has the maximum BOD removal efficiency.

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