Research Article
Apr 1970
Phosphate Release in Activated Sludge Process
Authors: Clifford W. Randall, M.ASCE, Duane W. Marshall, and Paul H. King, M.ASCEAuthor Affiliations
Publication: Journal of the Sanitary Engineering Division
Volume 96, Issue 2
Abstract
The mechanisms of soluble phosphate uptake and release by the activated sludge process are the subject of considerable controversy. In this laboratory study, luxury uptake was clearly accomplished during substrate utilization. The extent of uptake varied directly with the initial phosphate concentration. The subsequent release of soluble phosphate under both aerobic conditions and anaerobic conditions varied directly with the extent of uptake. The release of phosphate under anaerobic conditions was inhibited by the addition of sulfate salts known to cause plasmolysis. Anoxic release was not a function of ORP change, but the extent of release may be a function of the initial ORP level. Anoxic release correlated well with the disappearance of DO from solution. However, the results of the entire study indicated that release is a function of the biological stress on the system, and that the magnitude of release is related to the stress magnitude. Soluble phosphate release from activated sludge was found to be biological in nature and primarily the result of cell lysis.
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Published In
Journal of the Sanitary Engineering Division
Volume 96 • Issue 2 • April 1970
Pages: 395 - 408
Copyright
© 1970 American Society of Civil Engineers.
History
Published in print: Apr 1970
Published online: Feb 12, 2021
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Authors
Affiliations
Clifford W. Randall, M.ASCE
Assoc. Prof. of San. Engrg., Virginia Polytechnic Inst., Blacksburg, Va.
Duane W. Marshall
Research Engr., Nat. Council for Air and Stream Imp., Inc., Kalamazoo, Mich.
Paul H. King, M.ASCE
Assoc. Prof. of San. Engrg., Virginia Polytechnic Inst., Blacksburg, Va.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.