Removal of Hepatitis A Virus and Rotavirus by Drinking Water Treatment

摘要

The paper presents quantitative data from a two year study on the removability of rotavirus SA11 and hepatitis A virus added exogenously to Lake Houston raw water during treatment. Processes studied on laboratory and pilot scale included coagulation, filtration, softening and disinfection. Poliovirus type 1 was included as a frame of reference for which considerable data on removal during treatment processes is available. The results indicated that: (1) Alum and iron were both efficient coagulants in the removal of rotavirus and hepatitis A virus, as they were for polioviruses; (2) Various levels of turbidity and alkalinity had no influence on the extent of virus removal; (3) Addition of a nonionic coagulant aid did not improve the performance of coagulation and as a consequence did not enhance virus removal; (4) Rota, hepatitis and polioviruses showed a greater resistance to chlorine at pH 7.5 when suspended in raw water, 15 ntu; (5) Neither rotavirus nor hepatitis virus could be detected after 10 min exposure to 0.5 mg/L free residual chlorine at pH 7.5 in finished water in bench scale studies (turbidity 0.12 ntu).