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Q.

What is the fate of activated sludge in STP?

a) A major part is anaerobically digested to produce CH4 gas.
b) A small portion is used as an inoculum to start another cycle of secondary treatment.
c) The major portion is used as a biofertiliser.
d) It is released into rivers.

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a

 a and b only 

b

b and c only 

c

c and d only 

d

a and d only 

answer is C.

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Detailed Solution

 The fate of activated sludge in STP is as follows:
A major part is anaerobically digested to produce CH4 gas. Since it is rich with actively growing aerobic microbes, a small portion is used as an inoculum to start another cycle of secondary treatment.

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