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In the domestic water process, when air is sent during the active sludge, then _________ released.

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In the domestic water process, when air is sent during the active sludge, then _________ released.

(a) Oxygen

(b) Carbondioxide

(c) Nitrogen

(d) Chlorine

I have been asked this question in an online interview.

I'm obligated to ask this question of Methods of Reducing Water Pollution topic in chapter Water of Applied Chemistry

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Correct answer is (b) Carbondioxide

For explanation I would say: When the air is sent during the active sludge, then the carbondioxide is released in domestic water process.

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