Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13173
Title: Biofilms in water separation membrane processes: From community structure and ecological characteristics to monitoring and control
Authors: PANG CHEE MENG
Keywords: Biofilm Community Structure, Biofilm Control, Biofilm Monitoring, Biofouling, Microfiltration Membrane, Reverse Osmosis Membrane
Issue Date: 22-Mar-2008
Source: PANG CHEE MENG (2008-03-22). Biofilms in water separation membrane processes: From community structure and ecological characteristics to monitoring and control. ScholarBank@NUS Repository.
Abstract: This doctoral thesis examines the community structure of bacterial populations found in biofilms on microfiltration and reverse osmosis (RO) membranes using a polyphasic approach combining culture-independent molecular techniques, and bacterial cultivation. Possible reasons for the ecological successes of particular groups of bacteria (e.g. Rhizobiales and Sphingomonas) in the membrane biofilm community were examined in terms of metabolic characteristics (such as carbon substrate utilization and nitrate/nitrite respiration), as well as biofilm formation potential (e.g. motility, hydrophobicity, cell-surface charge, ability to produce exopolysaccharides). It was also shown here that organic carbon limitation strategies did not eliminate biofilms, but led to the selection of distinct bacterial populations. This has important implications for biofilm monitoring in membrane processes, where organic carbon measurements are often taken as surrogates to estimate biofilm formation. Finally, this thesis also examined the efficacy of alternative biofilm control strategies, like the disruption of bacterial cell-to-cell communication, and titanium dioxide photocatalysis.
URI: http://scholarbank.nus.edu.sg/handle/10635/13173
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