STP & ETP

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STP    Sewage treatment platn (residential & commercial)
ETP    Effluent treatment plant (industry)
COD    Chemical oxygen demand (soluble & insoluble organic compound) (2hr to 3hr) (mg/l)
BOD    Biochemical oxygen demand (organic compound) (3days to 5days) (mg/l)


KEY POINTS:

  • Outlet of STP 50mg/l
  • Biproduct of anaerobic digestion is H2S & NH3
  • To reduce stink smell use ozone 


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