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How many common approaches are used in secondary treatment?

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in Energy Management by (679k points)
How many common approaches are used in secondary treatment?

(a) One

(b) Two

(c) Three

(d) Four

I have been asked this question in an online quiz.

Origin of the question is Effects and Control Measures of Marine Pollution in section Environmental Pollution of Energy Management

1 Answer

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Best answer
Right choice is (c) Three

Explanation: Three commonly used approaches are used in the secondary treatment of sewage plants. The three commonly used approaches are trickling filters where we can see rotating arm, activated sludge process where we can see aeration tank and the last one is oxidation pond.

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