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Secondary sewage treatment is mainly a

Option: 1

Chemical process

Option: 2


Biological process

Option: 3

Physical process

Option: 4

Mechanical process

Answers (1)

  • 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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