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.

Question

TextMicrobes in Sewage TreatmentCBSE PYQ

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Study the figure given below and answer the questions that follow.

Write the full form of BOD.

Define BOD. Explain how it is a measure of the organic matter present in the water body.

TextMicrobes in Sewage Treatment

What do you mean by activated sludge in an STP ?

Microbes have been used by humans in household, industrial and agricultural setups. One such use is shown in the diagram given below.

Explain the biological treatment of primary effluent when passed into the large aeration tanks in a sewage treatment plant (STP).