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To check the efficiency before discharge and within the limit Can ne used for plantation.
Bio chemical oxygen demand we can take in to account. But COD is the quick method to know the efficiency quickly, and It also depends upon the Process like Activated Sluge Process, Aerated Lagoons and MBBR.
Efficiency depends upon so many other factor also, so pl do not fix only this.
Their are various factors which affects the efficiency of treatment plant. It cannot be limited to just2 parameters. But from the given2 parameters I would say BOD is the accurate one.
both BOD and COD are equally priority tests but it priority differes accordingly by witnessing other water quality parameter such as TDS, activated sludge
