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The objectives of this study included: study the performance of electrocoagulation-microfiltration (EC-MF) for virus removal in Lake Houston water (with natural organic matter (NOM), turbidity and other contaminants present);compare the virus removal efficiency of EC-MF in lake water (with NOM) and synthetic water (without NOM); and, compare chemical coagulation-microfiltration (CC-MF) and EC-MF for virus removal. Methods and materials included: test waters, Synthetic water : without NOMDI Hsub2/subO + 3.0 mM NaHCOsub3/sub + 1.0 mM CaClsub2/sub, pH ~7.5Lake Houston water : with NOMTurbidity = 10-12 NTU; DOC = 4 to 5 mg/L, pH = 7.3 -7.5; MS2 bacteriophage (0.025m) - indicator virus, Feed MS2 concentration = 10sup5/sup - 10sup7/sup PFU/mL;MS2 propagation and enumeration, USEPA's Information Collection Rule Method ,Host Bacterium - Escherichia coli (ATTC # 15597), Log Reduction Value (LRV) = log (CsubF/sub/CsubP/sub) CsubF/sub - feed MS2 concentration CsubP/sub - effluent MS2 concentration. Conclusions were that: CC-MF with Fesup3+/sup was effective for both test waters with and without NOM in the 6.3-7.5 pH range;virus removal was attributed to the adsorption of negatively charged virus particles to the positively charged iron species and the subsequent removal of the flocs by MF;EC-MF was effective for synthetic water due to the oxidation of Fesup2+/sup to Fesup3+/sup during several hours of continuous mixing and filtration;EC-MF was not effective for virus removal when treating water containing NOM, in spite of providing sufficient time for Fesup2+/sup oxidation; and,the ineffectiveness of EC is likely due to rapid binding of NOM with Fesup2+/sup and prevention of Fesup2+/sup oxidation, hydrolysis, and subsequent sorption of viruses. Includes tables, figures.

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Edition: Vol. - No. Published: 06/01/2007 Number of Pages: 43File Size: 1 file , 2.6 MB