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Aeration tank of sewage treatment plant

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An Intiative by Sri Chaitanya

is used for removal of soil and small pebbles

has activity of methanogens for production of biogas

allows growth of useful aerobic bacteria associated with fungal filaments

shows microbial activity that leads to rise in BOD of water

answer is C.

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Detailed Solution

Aeration tanks allow growth of masses of aerobic bacteria associated with fungal filaments to form flocs.

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