Laboratory Evaluation of Polymeric Flocculants

by Andrew Benedek, Asst. Prof.; Dept. of Chemical Engrg., McMaster Univ., Hamilton, Ontario, Canada,
John J. Bancsi, Research Engr.; Dept. of Chemical Engrg., McMaster Univ., Hamilton, Ontario, Canada,


Serial Information: Journal of the Environmental Engineering Division, 1976, Vol. 102, Issue 1, Pg. 17-28


Document Type: Journal Paper

Abstract: A procedure to evaluate the performance of polyelectrolytes used, in conjunction with metalic coagulants, in phosphorus removal was developed. The Batch Settling Apparatus is a modified version of the conventional jar tester. The modifications to the jar test apparatus consisted of lengthened jars with sampling probes connected to the solenoid valves, an automatic sample sequencer, and double blade stirrers on the Phipps and Bird ganged stirrer. Identical experiments with the Batch Settling Apparatus and a Cahn electrobalance established the accuracy of the Apparatus. The optimum procedure consisted of the following steps: (1) A 5-minute period between coagulant and polyelectrolyte additions; (2) a 1-minute rapid mix following polyelectrolyte addition; and, (3) a 4-minute flocculation period. Tests with the long tube settler indicate that the settling rates evaluated with the Batch Settling Apparatus are conservative.

Subject Headings: Phosphorus | Probe instruments | Valves | Automation | Birds | Flocculation | Laboratory tests

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