First slide

Microbes in Sewage Treatment

Question

In sewage treatment, sludge is collected from

Easy

A

primary settling tank only
B

primary settling tank and aeration tank
C

primary setting tank and anaerobic sludge digester
D

primary settling tank and secondary settling tank

Solution

Sludge formed in primary settling tank consisting of grit, sand and pebbles and other solid waste is called primary sludge. Activated sludge consists of flocs or mesh of filamentous fungi and bacteria settled in secondary settling tank.

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