A Visual Demonstration of the Beneficial Effects of Sewage Treatment for Phosphate Removal on Particulate Matter Production in Waters of Lakes Erie and Ontario

1 August 1970

journal article
Published by Canadian Science Publishing in Journal of the Fisheries Research Board of Canada

Vol. 27 (8) , 1493-1496
https://doi.org/10.1139/f70-171

Abstract

Filtered samples of raw sewage, biologically treated sewage, and sewage treated chemically for phosphate removal were added to unfiltered waters from lakes Erie and Ontario, and particulate residues (PR) on Millipore filters photographed after incubation in light for 10 and 30 days. PR levels in the sewage-enriched flasks were least in the case of sewage treated for removal of phosphates. Addition of phosphate to the phosphate-depleted effluent increased its PR generating ability to that of raw and biologically treated sewage. The removal of phosphates from sewage wastes thus appears to eliminate their fertilizing effect.

Keywords

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