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Coagulation of Organic Suspensions with Aluminum Salts

Steven K. Dentel and James M. Gossett
Journal (Water Pollution Control Federation)
Vol. 59, No. 2 (Feb., 1987), pp. 101-108
Stable URL: http://www.jstor.org/stable/25043186
Page Count: 8
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Coagulation of Organic Suspensions with Aluminum Salts
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Abstract

Wastwater coagulation was characterized in a series of laboratory experiments. Two different types of organic suspensions were created to simulate the concentration, size, and charge of particles measured in a primary clarifier, and these suspensions were coagulated in controlled jar tests. The four zones typically observed for coagulation in water treatment were also exhibited in these experiments, but the data indicated that some modifications to the conventional explanations of these zones were necessary. Most importantly, the role of aluminum hydroxide precipitation must be considered when describing Zone 2 destabilization. Coagulation with Zone 2 doses also reduced anaerobic biodegradability of the resulting sludges much less than did Zone 4 doses. Implications of these findings are discussed with regard to coagulation strategy for wastewater treatment plants and necessary trade-offs in turbidity removal, coagulant consumption, sludge production, and sludge digestibility.

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