Chapter
Apr 26, 2012
Effect of Soluble Microbial Products on Simultaneous Nitrification-Denitrification in MBRs
Authors: Ladan Holakoo [email protected], George Nakhla, Ernest Yanful, and Amarjeet BassiAuthor Affiliations
Publication: World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Abstract
Previous work on MBR reported nitrogen removal via simultaneous nitrification and denitrification (SND) to be unstable despite steady state conditions and the concentrations of soluble microbial products (SMP) in MBR were found to vary up to 60% of the average value. The results of the present study showed that oxygen transfer efficiency (KLa) is a function of the mixed liquor suspended solids and SMP concentrations with improved KLa at lower biomass and higher SMP concentrations. Under limited DO conditions, the reaction rate inside the floc changes with KLa and while nitrification is enhanced at higher KLa SND decreases. Therefore, in order to achieve a reliable and stable SND in MBRs, a very tight DO control or other means of DO control such as control based on the activity of anoxic enzyme could be a more viable option. This might necessitate spatial arrangement of membranes or compartmentalization of submerged MBR tanks for a better DO control.
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Published In
World Environmental and Water Resources Congress 2007: Restoring Our Natural Habitat
Pages: 1 - 10
Copyright
© 2007 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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Affiliations
View Engineering, A Veolia Water Solutions and Technologies Company, 400 Professional Drive, Suite 380, Gaithersburg, MD 20879. E-mail: [email protected]
George Nakhla
Department of Chemical and Biochemical Engineering, U. of Western Ontario, London, ON, N6A 5B9, Canada
Ernest Yanful
Department of Civil and Environmental Engineering, U. of Western Ontario, London, ON, N6A 5B9, Canada
Amarjeet Bassi
Department of Chemical and Biochemical Engineering, U. of Western Ontario, London, ON, N6A 5B9, Canada
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