Effects of Magnetic Ion-Exchange Resin Addition During Coagulation on Floc Properties and Membrane Filtration
Abstract:The application of magnetic ion-exchange resin (MIEX) during chemical coagulation was investigated for the removal of organic matters responsible for fouling in membrane processes. Two different coagulants were used—polyaluminium chloride (PACl) and polyaluminium chloride silicate (PACS). The MIEX addition during coagulation with both PACl and PACS considerably enhanced removal of dissolved organic carbon. Coagulation with MIEX treatment substantially removed all portions of natural organic matter (NOM), while the MIEX treatment alone effectively removed the hydrophobic and transphilic portions of NOM. The enhanced NOM removal by PACl coagulation with the addition of MIEX had positive effects on membrane flux at moderate transmembrane pressure conditions. However, the almost identical flux patterns were reported in the experiments of coagulation with PACS and PACS with MIEX addition. The results of the specific cake resistances indicated that the MIEX addition substantially decreased the resistances. The larger size distributions of PACl with MIEX corresponded well with the flux improvement.
Document Type: Research Article
Publication date: March 1, 2010
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