Please check TSS & turbidity ...
Published by Shikha Srivastava, BPC India Pvt. Ltd. - Research Biochemist
Please check TSS & turbidity before and after DAF, this will estimate performance efficiency of Daf and try optimise the coagulant and flocculent dose then. You might use some sieve tubes as well. If there is a sudden change in characteristic of effluent water please analyse that also. This may help to eradicate the COD problem