Using the Kinetics of Biological Flocculation and the Limiting Flux Theory for the Preliminary Design of Activated Sludge Systems. II: Experimental Verification
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Volume 133, Issue 1
Abstract
Current activated sludge models consider that the removal of biodegradable organics by suspended growth includes: rapid enmeshment of the organic particles in the microbial floc, hydrolysis of the complex organic molecules into readily biodegradable organic substances, and oxidation of dissolved organic substances. All of the models assume that hydrolysis is the rate-limiting step, but none considers the role that the kinetics of biological flocculation and the sludge-settling characteristics may play in defining the activated sludge operating parameters. Several researchers have studied the kinetics of biological flocculation, and have analyzed its role on the removal of particulate chemical oxygen demand in suspended growth reactors. It has been demonstrated that a large proportion of the organic matter present in sewage can be removed by biological flocculation using short hydraulic retention times and subsequent settling. The first paper demonstrates that the one-dimensional limiting flux theory may be useful for coupling the sludge-settling properties with the aeration tank behavior, and the second paper presents experimental evidence that the proposed model is a reasonable first approximation that can be used for activated sludge system design and operation.
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Acknowledgments
The research reported herein was funded by the University of New Orleans Schlieder Urban Environmental Systems Center through an EPA grant and by the Jefferson Parish Department of Sewerage. The contribution of the research team members, Jackeline Luque, and Eudomar Silva is greatly appreciated.
References
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Jiménez, J. A., La Motta, E. J., and Parker, D. S. (2005). “Kinetics of removal of particulate chemical oxygen demand in the activated sludge process.” Water Environ. Res., 77(5), 437–446.
La Motta, E. J., Jiménez, J. A., Josse, J. A., and Manrique, A. (2004). “Role of bioflocculation on COD removal in the solids contact chamber of TF/SC process.” J. Environ. Eng., 130(7), 726–735.
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Vesilind, P. A. (1968). “Discussion of ‘Evaluation of activated sludge thickening theories,’ by R. I. Dickand B. B. Ewin.” J. Sanit. Engrg. Div., 94, 185.
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Published In
Journal of Environmental Engineering
Volume 133 • Issue 1 • January 2007
Pages: 111 - 116
Copyright
© 2007 ASCE.
History
Received: Apr 19, 2006
Accepted: May 15, 2006
Published online: Jan 1, 2007
Published in print: Jan 2007
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