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Q.

The ‘flocs’ present in large aeration tanks causes _________ in BOD.a. decreaseb. increasec. no change

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a

only a

b

b and c

c

a and b

d

only c

answer is A.

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Detailed Solution

In large aeration tanks, 'flocs' consume the major part of the organic matter in the effluent. This significantly reduces the BOD (biochemical oxygen demand) of the effluent.
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