Direct Filtration of Chlorella with Cationic Polymer
Publication: Journal of Environmental Engineering
Volume 115, Issue 2
Abstract
The extracellular organic matter (EOM) released by laboratory algal monocultures of Chlorella was characterized in terms of its molecular weight distribution and its electrical charge concentration, and was found to compare well with the dissolved carbon found in natural algal‐rich impoundments. Reaction between EOM and cationic polymer was demonstrated, with concomitant turbidity development. A simple turbidimetric procedure for rapid estimation of the cationic polymer demand exerted by the EOM is proposed. The significance of this EOM demand was demonstrated in a series of direct filtration experiments with algal suspension. When just enough cationic polymer was added to quench the EOM demand, no polymer was available to flocculate the algal cells and cell removal was poor. If more polymer was added, the polymer that remained after reaction with the EOM did cause flocculation of the algal cells with improved removal. On an equal mass basis, a cationic polymer with higher charge density did better than a polymer with lower charge density. The qualitative effects of a prolonged mixing step between polymer addition and filtration were observed.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 115 • Issue 2 • April 1989
Pages: 348 - 366
Copyright
Copyright © 1989 ASCE.
History
Published online: Apr 1, 1989
Published in print: Apr 1989
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