First slide

Microbes in Sewage Treatment

Question

Primary treatment in a sewage treatment plant

Easy

A

involve physical removal of large and small particles.
B

involves constant mechanical agitation.
C

helps in reduction of biochemical oxygen demand.
D

contains large tanks called anaerobic sludge digesters.

Solution

Primary treatment steps basically involve physical removal of particles – large and small – from the sewage through filtration and sedimentation. Initially, floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. All solids that settle form the primary sludge, and the supernatant forms the effluent. The effluent from the primary settling tank is taken for secondary treatment.

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