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What is called for the removal of sand, gravel in the primary treatment of sewage treatment plant?

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What is called for the removal of sand, gravel in the primary treatment of sewage treatment plant?

(a) Course screening

(b) Fine screening

(c) Grit removal

(d) Chlorination

This question was addressed to me in an online interview.

My question is based upon Effects and Control Measures of Marine Pollution topic in chapter Environmental Pollution of Energy Management

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Correct choice is (c) Grit removal

The best explanation: The removal of sand and gravel from the sewage in the primary treatment of sewage plant is known as grit removal. This is the third step in primary treatment after course screening and fine screening.

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