First slide

Microbes in Sewage Treatment

Question

The ‘flocs’ present in large aeration tanks causes _________ in BOD.
a. decrease
b. increase
c. no change

Easy

A

only a
B

b and c
C

a and b
D

only c

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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