Explain Rapid Mixing Tank and Flocculation Basin , Civil Engineering

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Explain Rapid Mixing Tank

  • For the chemical reactions to occur, the chemicals must be mixed with water
  • for both coagulation and softening we need mixing of chemical with water
  • Mixing or rapid mixing is the process in which chemicals are quickly and uniformly dispersed in water (instantaneously)
  • for coagulation and softening processes precipitates form during the mixing
  • the precipitates formed must be brought into contact with one another and colloids so that they can agglomerate and form larger particles called flocs - this process is called flocculation and is accomplished by slow, gentle mixing (rapid mixing may break up the flocs)
  • Degree of mixing is measured by velocity gradient G (amount of shear taking place). Higher the G, the more violent the mixing

 

Design Criteria  

Rapid Mix 

Volume   = Flow rate (Q)*detention time 

Detention is in the order of seconds 30-120 seconds

Mixing basin is typically a cube


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