Research Article
Oct 1971
Anaerobic Digestion of Sludges Containing Iron Phosphates
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VIEW THE REPLYAuthors: Sudershan K. Malhotra, AM.ASCE, Thomas P. Parrillo, AM.ASCE, and Alan Gene HartensteinAuthor Affiliations
Publication: Journal of the Sanitary Engineering Division
Volume 97, Issue 5
Abstract
The phosphorus removals can be enhanced by precipitating bulk of the phosphorus with cation addition to the existing plants without costly alterations. Ferrous-iron was used to precipitate bulk of the phosphorus from raw waste water in the form of primary sludge and in aeration tanks in the form of waste activated sludge. The digestibility and the fate of phosphorus during the anaerobic digestion of such sludges was evaluated in bench scale studies and compared with those of corresponding control sludges containing very little or no iron precipitated phosphorus. The presence of iron in the sludge up to about 5% iron on the dry solids basis did not upset or affect the performance of the gas mixed digestion units. A significant release of phosphorus occurred on the anaerobic digestion of waste activated sludge containing high amounts of ferrous-iron precipitated phosphorus, while a significant uptake of phosphorus was observed on the digestion of primary sludge containing ferrous-iron precipitated phosphorus.
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Published In
Journal of the Sanitary Engineering Division
Volume 97 • Issue 5 • October 1971
Pages: 629 - 646
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Oct 1971
Published online: Feb 12, 2021
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Authors
Affiliations
Sudershan K. Malhotra, AM.ASCE
Dir. of Sanitary Engrg. Research and Studies, Williams and Works, Grand Rapids, Mich.
Thomas P. Parrillo, AM.ASCE
Application Engr., Walker Process Equipment, Aurora, Ill.
Alan Gene Hartenstein
Design Engr., Black, Crow and Eidsness, Inc., Consulting Engrs., Gainesville, Fla.
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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.
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.