Dear Mr.Vassos we haven't any problem with COD in the outlet of aeration, but the problem is in the settling tank and turbidty increased, I think with an increase of retention tank the property of bioflocculation  will be weak, I want to know the effect for clarification properties . thanks a lot

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Dear Mr.Vassos

we haven't any problem with COD in the outlet of aeration, but the problem is in the settling tank and turbidty increased, I think with an increase of retention tank the property of bioflocculation  will be weak, I want to know the effect for clarification properties .

thanks a lot