the liquid was clarified for 30 min, then the supernatant was withdrawn from a point located about 2cm below the top of
the liquid level of the beaker to determined COD, SS, color, and oil and grease (O&G) by using standard methods
(APHA, AWWA & WEF, 2012) so that the effect of coagulant dosage could be studied. This experiment is repeated
for the other coagulant (polyaluminum chloride, ferric chloride and ferric sulfate).
the liquid was clarified for 30 min, then the supernatant was withdrawn from a point located about 2cm below the top ofthe liquid level of the beaker to determined COD, SS, color, and oil and grease (O&G) by using standard methods(APHA, AWWA & WEF, 2012) so that the effect of coagulant dosage could be studied. This experiment is repeatedfor the other coagulant (polyaluminum chloride, ferric chloride and ferric sulfate).
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