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Q.

During sewage treatment, the primary treatment includes

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a

sequential filtration and sedimentation to remove large and small particles of sewage.

b

degradation of dissolved organic matter by heterotrophic organisms.

c

degradation or digestion of flocs.

d

removal of heavy metals.

answer is A.

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Detailed Solution

Primary treatment includes filtration of floating and suspended debris and sedimentation to remove the sand grit (Primary sludge).
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During sewage treatment, the primary treatment includes