Date of Award
Spring 1970
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Civil, Construction, and Environmental Engineering
First Advisor
Malhotra, S. K.
Second Advisor
Zanoni, A. E.
Third Advisor
Crandall, Clifford J.
Abstract
Conventional activated sludge sewage treatment plants have been reported to have removed from 20% to 80% of the phosphorus present in the waste waters. The mechanism of phosphorus removal has not been completely defined and opinions are split between the role of the biological and the chemical removal in overall phosphorus removal in the activated sludge process. The biological theory contends that phosphorus is mainly removed by the organisms in the activated sludge floc and that phosphorus can be removed in excess of that required for their normal growth under certain optimum process operating parameters. The chemical theory contends that phosphorus is mainly removed by cationic precipitation, which is controlled by the chemical characteristics of the waste water and the pH in the aeration tank. This studyt involves a broad investigation of the effect of activated sludge process parameters on the soluble orthophosphate uptake and release. Samples of raw screened sewage and mixed liquor at the aeration tank outlet (settled to concentrate and used as a return sludge) obtained from the Milwaukee Sewerage Commissions' Jones Island Sewage Treatment Plant were used for all the batch studies. The soluble orthophosphate results were compared with the biochemical oxygen demand, pH, aeration time, settling time, dissolved oxygen concentration, mixed liquor suspended solids, etc. in an attempt to obtain a better understanding of the soluble orthophosphate removal.
Recommended Citation
Manthe, Richard M., "Uptake and Release of Soluble Orthophosphate in an Activated Sludge Plant" (1970). Master's Theses (1922-2009) Access restricted to Marquette Campus. 4767.
https://epublications.marquette.edu/theses/4767