||Virus sensitivity to chlorine disinfection of water supplies /
Engelbrecht, Richard S. ;
Weber, Michael J. ;
Schmidt, Carla A. ;
Salter, Brenda L.
||Illinois Univ. at Urbana-Champaign. Dept. of Civil Engineering.;Municipal Environmental Research Lab., Cincinnati, OH.
|| Environmental Protection Agency, Office of Research and Development, Municipal Environmental Research Laboratory ; For sale by the National Technical Information Service,
Chlorine and derivatives as disinfectants. ;
Disinfection and disinfectants. ;
Potable water ;
Water treatment ;
Coxsackie viruses ;
ECHO viruses ;
Water pollution ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 44 pages : illustrations ; 28 cm.
The efficiency of chlorine disinfection of viruses is likely to be affected both by the type of virus and by the nature of the suspending medium. The purpose of this study was to examine the effects of virus type, suspending medium and the interaction of these, on the kinetics of inactivation by chlorine. Six enteric viruses (picornaviruses) as well as SV40 and Kilham rat virus were studied under carefully controlled laboratory conditions. It was found that the different virus types showed a wide range of sensitivity to chlorine disinfection. The rate of inactivation was greater at pH 6 than at pH 10; however, the relative sensitivities of the different viruses were affected differently by changes in pH. This indicates an effect of pH both on the species of chlorine and on the sensitivity of the virus. The presence of dissolved ions also had an effect on sensitivity to chlorine. The possible effects of virus aggregation and the appearance of chlorine resistant mutants were investigated as well. The results indicate that it will be difficult to obtain a single virus type which will serve as a suitable indicator of disinfection under all circumstances.
Grant EPA R-803-346. Issued Aug. 1978. Includes bibliographical references (pages 42-43). Microfiche.