||Microbial Indicators for the Biological Quality of Treated Wastewater Effluents.
Greening., Elaine Oscherwitz ;
||Illinois Univ., Urbana. Dept. of Civil Engineering.
||EPA-17060-EYZ; W74-07372 ; EPA-670/2-73-082
Indicator species ;
Water pollution ;
Public health ;
Coliform bacteria ;
Escherichia coli ;
Experimental data ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Due to the relatively low resistance of coliforms to chlorination when compared to resistance enteric pathogens such as viruses and protozoal cysts, a search was initiated for a new chlorine resistant bioindicator. The presently used indicator organisms and the reported chlorine resistance of wastewater organisms are reviewed. Wastewater effluents were chlorinated to a free chlorine residual and plated on various media at different temperatures. Surviving organisms were collected for further study. With this procedure the most chlorine osensitive organisms were eliminated from consideration. Pure cultures of 135 isolates were collected in this manner. A yeast and two different acid-fast bacteria were shown to be resistant to chlorination at levels considered necessary for the inactivation of pathogens, including viruses.