Author： Henderson R. K. Parsons S. A. Jefferson B.
Publisher： Taylor & Francis Ltd
ISSN： 0149-6395
Source： Separation Science and Technology, Vol.43, Iss.7, 2008-05, pp. : 1653-1666
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Abstract
Algae can interfere with treatment processes at a water treatment works. Coagulation control is critical to reduce the impact of algae on downstream processes. This paper investigates the coagulation and flotation of four species of algae - Asterionella formosa, Melosira sp., Microcystis aeruginosa, and Chlorella vulgaris. The zeta potential at optimum removal was measured and it was observed that when the zeta potential was reduced to between -8 mV and +2 mV, removal of algae and associated organic material was optimized, irrespective of the coagulant dose or pH. Process control using zeta potential is therefore a viable tool for algae removal.
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