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Given below are the steps involved in se...

Given below are the steps involved in sewage treatment. Arrange them in proper sequence and select the correct option.
A. Passage of primary effluent into large aeration tanks for mechanical agitation and pumping of air.
B. Passage of secondary effluent and formation of activated sludge.
C. Physical removal of particles through filtration and sedimentation
D. Release of effluent from the secondary treatment plant into natural water bodies.
E. Growth of useful aerobic microbes into flocs which significantly reduce the BOD.

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