Interactions controlling biopolymer fouling of reverse osmosis membranes |
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| Affiliation: | 1. Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, South Korea;2. Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, 90095, USA;1. Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06520-8286, United States;2. Strategic Water Infrastructure Laboratory, School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;1. Department of applied chemistry, University of Johannesburg, P.O Box 17011, Doornfontein 2028, South Africa;2. College of Engineering, Science and Technology, University of South Africa, P.O Box 392, Pretoria 003, South Africa;3. Department of Applied Analytical and Physical chemistry, University of Gent, Coupure links 653, B-9000 Ghent, Belgium;1. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, China;2. Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario, P7B 5E1, Canada |
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| Abstract: | Laboratory experiments and model calculations were performed to elucidate the fundamental interactions that control organic fouling in reverse osmosis (RO) processes. Bovine serum albumin and alginic acid were selected as model aquatic organic macromolecules (organic foulants). An extended Derjaguin-Landau-Verwey-Overbeek (DLVO) characterization analysis was used to elucidate mechanisms of organic matter fouling on a commercial, polyamide composite RO membrane. Surface tension parameters derived from contact angle analyses are used to demonstrate that the apparent thermodynamic stability of macromolecules determines and adhesive free energy between membranes and macromolecules explained the observed differences in flux decline. Further, foulant–membrane and foulant–foulant interfacial forces helped explain why hydrophilic macromolecules formed polarization layers causing minimal flux decline, while hydrophobic macromolecules formed gel (or cake) layers that led to severe flux decline. |
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