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Characteristics of Adsorption on the RO Membrane Surface by Coagulants Types  

Jeong, Youngmi (한국과학기술연구원 환경기술연구단)
Park, Chanhyuk (한국과학기술연구원 환경기술연구단)
Lee, Sanghyup (한국과학기술연구원 환경기술연구단)
Kweon, Jihyang (건국대학교 공과대학 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.21, no.4, 2007 , pp. 477-483 More about this Journal
Abstract
A coagulation process for RO (reverse osmosis) membrane pretreatment system was an effective technology to remove colloidal and particulate matters. However, coagulant residuals from the pretreatment process may negatively affect RO membrane performance. The bench-scale coagulant exposure study was performed to investigate the effect of their residual on adsorbed mass which related to the membrane performance. Coagulant addition in this study ranged from 0 to 5mg/L ferric chloride, alum, and 2mg/L cationic polymer(poly-di-methyldiallyl ammonium chloride) as coagulant aids. This results showed that adsorbed mass is not significantly increased during short-time period, however, accumulated mass of coagulants on the membrane surface is significantly increased during long-time experimental period. The effect of pH on coagulants adsorption characteristics was significantly differed due to the electrostatic repulsive interactions between soluble coagulants and membrane surface charge. This data suggest that the RO membrane performance of drinking water treatment plant could be decreased by adsorption of residual coagulants when applied for the coagulant pretreatment process.
Keywords
Coagulation Process; Coagulants; Aluminum Sulfate; Ferric Chloride; Adsorption;
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