Bacteriology of chlorinated and unchlorinated wastewater effluents

A bacteriological and chemical study was conducted on a segment of the Trinity River, Texas, to determine the effects of chlorination of effluents. Waste effluents contributed large numbers of fecal coliforms and fecal streptococci. Chlorination reduced the quantities of microorganisms only at the stations where chlorine was directly applied, and bacterial populations recovered immediately when chlorination ceased. Beneficial heterotrophic bacteria were susceptible to chlorination