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  • Describe the process of Secondary treatment given to muncipial waste water (sweage) before it can be relased into fresh waterbodies. Mention another benefit provided by this process.    

Describe the process of Secondary treatment given to muncipial waste water (sweage) before it can be relased into fresh waterbodies. Mention another benefit provided by this process.

 

 

 

 
 
 
 
 

Answers (1)

Process of Secondary treatment - 

  • The primary effluent is passed into large aeration tanks where it is constantly agitated mechanically and the air is pumped into it which allows vigorous growth of useful aerobic bacteria 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 which significantly reduces the biochemical oxygen demand of effluent.
  • The effluent is then passed into a settling tank where the bacterial 'flocs' are allowed to sediment and this is called Activated sludge.
  • A small part of the activated sludge is pumped back into the aeration tank to serve the inoculum.
  • The remaining major part of the sludge is pumped into a large tank called anaerobic sludge digestors. Here other kinds of bacteria that grow anaerobically, digest the bacteria and the fungi in sludge.
  • During digestion, bacteria produce a mixture of gases such as methane, hydrogen sulphide and carbon dioxide. These gases form biogas and can be used as a source of energy as it is inflammable.
  • The effluent from the secondary treatment plant is generally released into natural water bodies like rivers and streams.
Posted by

Priyanka Kumari

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