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List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. - CBSE (Science) Class 12 - Biology

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Question

List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment.

Solution

Primary effluent is taken in large aeration tanks where it is continuously agitated mechanically and air is pumped into it. This allows the growth of a large number of aerobic bacteria and fungi (flocs). Growing flocs start consuming organic matter present in the effluent. This decreases the biological oxygen demand (BOD) of the effluent. Sewage is treated till the BOD is significantly reduced. 

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APPEARS IN

Solution List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment. Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control.
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