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.