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Q.

What would happen if oxygen availability to activated sludge flocs is reduced?

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a

It will slow down the rate of degradation of organic matter.

b

The centre of flocs will become anoxic, which would cause death of bacteria and eventually breakage of flocs.

c

Flocs would increase in size as anaerobic bacteria would grow around flocs.

d

Protozoa would grow in large numbers.

answer is B.

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Detailed Solution

In the secondary treatment of sewage, if oxygen availability to activated sludge flocs (masses of bacteria associated with fungal filaments to form mesh like structure) is reduced; the centre of flocs will becomes anoxic, which would cause death of bacteria and eventually breakage of flocs.
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