then the supernatant was withdrawn from a point located about 2cm below the top of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).
then the supernatant was withdrawn from a point located about 2cm below the top of the liquid level of the beaker to determined COD, SS, color, and oil and grease (O&G) by using standard methods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).
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