Abstract
In this study, reduction efficiencies of viruses in secondary treated waters by coagulation treatment and following membrane filtration, which are supposed to be treatments for wastewater reclamation, were studied. The coagulation followed by UF filtration showed only a 3-log reduction in the pilot plant test. Consequently, lab-scale tests for evaluating effects of coagulation condition, i.e., types and dosages of coagulants, and raw water quality, i.e., SS, pH, DOC, E260, were conducted.Regarding raw water quality parameters, pH and DOC showed a great effect on virus reduction by coagulation and following membrane filtration (0.45 μm) while particles larger than 0.01 μm were not seemed to affect that. It was found that the pH5 condition was optimization of viral adsorption to/entrapment in floc. As the result, we could achieved 7-log virus reduction by coagulation under pH5 following by membrane filtration.
