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Study the figure given below and answer the questions that follow.
Write the full form of BOD.
What do you mean by activated sludge in an STP ?
Explain the biological treatment of the major part of the sludge transferred from the large aeration tank into the anaerobic sludge digesters before its final release into the natural water bodies.
Explain the biological treatment of primary effluent when passed into the large aeration tanks in a sewage treatment plant (STP).
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