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AWWA MTC69767
- Nanofouling of Polypropylene Microfiltration Membranes by Clarified Secondary Effluent
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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This powerpoint presentation begins by providing a brief overview of the Orange County Water District and the GWR System AdvancedWater Purification. Project objectives were to:examine microfiltration (MF) fouling of polypropylene membranematerial under controlled conditions;characterize materials and conditions responsiblefor MF fouling;prevent the foulants from entering the membranematrix; and,improve permeate flux, extend membrane life anddecrease operating costs. Foulant characterization (microparticles vs. nanoparticles) is presented, along with feedwater chemistry matrix effects, and a MF coagulant pilot study. Presentation conclusions indicate the following:microparticulate cake formation is not theprimary mechanism responsible for MF fluxreduction;nanoparticles < 200 nm but > 2.5 nm (10KDaltons) can coat and enter the membrane matrixand cause pore plugging;changes in feedwater chemistry can influencenanoparticulate fouling; and,chemically aggregating nanoparticulates (< 200nm) into microparticulates (> 200 nm) lowers TMPand slows down accumulation of material in themembrane matrix and may improve membraneperformance. Includes figures.
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