A free chlorine plant of pulp and paper will be installed near River and the effluent has to be reused because it will not be discharged to the river. The expected concentration of BOD will be low but the COD will be around 800 mg/L and the real color will be dark too. The secondary treatment will be an activated sludge process selector type.
Can this water be used for irrigation of fields? What are the risks?
Dear Anand,
According to the standards by the Central Pollution Control Board, the permitted values of BOD less than 30 mg/l and for COD less than 250 mg/l.
In addition, the following link may provide you with very important data on the values of parameters to be followed when using treated water for irrigation.
Water Quality for Agriculture ( www.fao.org/DOCReP/003/T0234e/T0234E06.htm).
Hoping this will be helpful,
Rafik
A question about the content of the effluent, does it contain a large amount of short fibers? If there is, there may be a treatment that would permit discharge.
I agree with Mr. Edward Calt. Amount of effluent matters before discharging for irrigation of a field.
Anand, My experience in Bahrain says, water has to be treated at least up to Tertialry level for usage in certain types of crops... In your case COD is too high, and colour too is not aesthetic...