The Influence of Shear on Extracellular Polymeric Substance Production in Membrane Bioreactors
Menniti, Adrienne L.
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https://hdl.handle.net/2142/83393
Description
Title
The Influence of Shear on Extracellular Polymeric Substance Production in Membrane Bioreactors
Author(s)
Menniti, Adrienne L.
Issue Date
2009
Doctoral Committee Chair(s)
Eberhard Morgenroth
Department of Study
Civl and Environmental Engineering
Discipline
Civl and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Environmental
Language
eng
Abstract
The experimental results of the current study show two dominant mechanisms of soluble EPS production in MBRs: (1) erosion of floc-associated EPS and (2) biomass decay caused by predation. Soluble EPS produced by erosion was readily biodegradable while soluble EPS produced by biomass decay which was slowly degradable. It was further demonstrated that mathematical models of soluble EPS production in MBRs should include both erosion of floc-associated EPS and biomass decay. EPS production is tightly linked with fouling in MBRs. The current work demonstrates the link between MBR operation (i.e., level of shear) and EPS production. Ultimately, an understanding of the complex mechanisms of EPS production and their inter-relationship with process parameters will help facilitate the evolution of MBR operational philosophy toward strategies that both minimize the production of biological foulants in addition to reducing the deposition of foulants on the membrane surface.
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