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List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent during sewage treatment.                                                                                                                         (2)

Explanation:

   Primary effluent is passed into large aeration tanks 

                            

   Constantly agitated mechanically and air is pumped into it 

                             

   This allows vigorous growth of useful aerobic microbes into flocs 

                              

    While growing these microbes consume major part of the organic matter  in the effluent 

                                

   This reduces BOD of the effluent significantly.                                                                     (2)

BOARD