First slide

Microbes in Sewage Treatment

Question

Biochemical oxygen demand of sewage is decreased in which one of the following by the activity of aerobic fungi and bacteria?

Easy

A

Primary settling tank
B

Aeration tank
C

Anaerobic sludge digestor
D

Secondary settling tank

Solution

Biochemical oxygen demand is decreased due to digestion of dissolved organic matter by aerobic fungi and bacteria in aeration tank in which the effluent is continuously subjected to mechanical agitation.

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