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Question

Domestic sewage of large cities.


A
Has very high amount of suspended solids and dissolved salts
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B
When treated in sewage treatment plant does not require aeration
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C
Has high BOD as it contains both aerobic and anaerobic bacteria
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D
Is processed by aerobic and then anaerobic bacteria in secondary treatment in sewage treatment plant
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Solution

The correct option is D Is processed by aerobic and then anaerobic bacteria in secondary treatment in sewage treatment plant
Domestic sewage is processed in 3 stages first by aerobic and then by anaerobic bacteria.
Correct answer-D

Biology

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