Research Article
Dec 1982
Anaerobic Digestion of Waste Activated Sludge
Authors: James M. Gossett, M.ASCE, and Roy L. BelserAuthor Affiliations
Publication: Journal of the Environmental Engineering Division
Volume 108, Issue 6
Abstract
The purpose of this laboratory study was to evaluate, and model the effect of solids retention time in the activated sludge process (θcAS) on the performance of anaerobic digesters fed the resulting waste sludges. Activated sludge systems were operated over a range of θcAS values, with the waste sludges used as feed sources for batch and semi-continuous anaerobic digestion studies. Previous models for aerobic biodegradability of activated sludges were found to accurately predict ultimate anaerobic digestibility. However, conventional kinetic models of digestion over-estimated actual performance with this substrate. An activated-sludge anaerobic digestion model is proposed which includes a first-order rate mechanism for preliminary conversion of viable activated sludge biomass into available anaerobic substrate. Decreasing θcAS results in increased sludge solids for digestion. However, the solids are of sufficiently greater digestibility that both the quantity of digested solids for ultimate disposal, as well as the cost of digestion, are virtually independent of θcAS.
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Published In
Journal of the Environmental Engineering Division
Volume 108 • Issue 6 • December 1982
Pages: 1101 - 1120
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Dec 1982
Published online: Feb 11, 2021
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Authors
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James M. Gossett, M.ASCE
Assoc. Prof., Environmental Engrg. Dept., Hollister Hall, Cornell Univ., Ithaca, N.Y. 14853
Roy L. Belser
Sr. Engr., Environmental Activities, General Motors Assembly Div., General Motors Corp., North Tarrytown, N.Y.
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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.