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