Evaluation of Fecal Streptococci Tests for Chlorinated Secondary Sewage Effluents

1 April 1974

journal article
Published by American Society of Civil Engineers (ASCE) in Journal of the Environmental Engineering Division

Vol. 100 (2) , 253-267
https://doi.org/10.1061/jeegav.0000158

Abstract

Fecal streptococci (FS) recovery on chlorinated secondary sewage effluents was investigated in the laboratory using the membrane filter (MF) and multiple-tube or most probable number (MPN) methods. For chlorinated effluents, the FS counts on membranes with M-Enterococcus agar for 2-day incubation (MF₂) were less than the MPN values. For enrichment purposes, the use of azide dextrose broth, brain-heart infusion broth, and peptone yeast-extract casitone with M-Enterococcus agar MF₂ procedure was not satisfactory for the recovery of FS on chlorinated effluents. The M-Enterococcus agar MF procedure with bile broth enrichment (MF₂) or prolonged incubation for 3 days (MF₃) significantly increased FS recovery on chlorinated effluents and were comparable to the MPN method.

Keywords

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