Browsing by Author "Wang, Yün"
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Item The removals of hepatitis A virus, rotavirus and poliovirus from water by softening, filtration, and disinfection(1987) Wang, Yün; Symons, James M.; Matson, Jack V.; Tiller, Frank M.; Clifford, Dennis A.Isolation of several viruses from finished drinking water has been performed by researchers. This finding emphasizes that water could serve as an important route for the transmission of those viruses. For example, three waterborne outbreaks of rotavirus gastroenteritis in Brazil, U.S.S.R., and U.S.A, have been reported. Three viruses, hepatitis A virus, rotavirus and poliovirus, were examined in this project to study their removability during softening, filtration and disinfection processes. Overall virus removal by a complete water treatment process was also studied in a pilot plant operation. Some side studies to understand virus behavior during the water treatment processes were performed as well. Good virus removal was observed in softening and disinfection processes. Filtration alone did not remove all three viruses very well; however, employed with coagulation-settling, filtration did improve the overall efficiency of virus removal. One hundred percent virus inactivation usually was achieved in the disinfection process when contact time was sufficient. Turbidity was present, however, some poliovirus survived in a disinfection process even after 30 min contact time. In general, traditional drinking water treatment is able to successfully remove viruses from raw water. Optimum operation is the key factor to reach this goal. Some side studies showed that improper pH control, insufficient flocculation or chlorination time significantly reduced virus removal during water treatment.