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  • Secondary sewage treatment is mainly a  Option: 1 Chemical process  Option: 2</

Secondary sewage treatment is mainly a
 

Option: 1

Chemical process
 


Option: 2

 

Biological process
 


Option: 3

Physical process


Option: 4

Mechanical process
 


Answers (1)

best_answer
  • The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and the air is pumped into it. 
  • This allows vigorous growth of useful aerobic microbes into flocs (masses of bacteria associated with fungal filaments to form mesh-like structures). 
  • While growing, these microbes consume the major part of the organic matter in the effluent. 
  • Hence, the correct option is (b). 
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Rishi

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