Abstract
Sewage effluent from the anaerobic settling tanks of the Oxfam Sanitation System contained reduced populations of Enterobacteriaceae and small numbers of non‐cholera vibrios (NCVs). This effluent was passed through percolating ‘filters’ constructed either of broken honeycomb bricks or corrugated iron in a zig‐zag stack. Multiplication of NCVs occurred in both filter matrices. Laboratory experiments confirmed that NCVs were able to multiply in sewage effluent in static culture and also that Vibrio cholerae El Tor was unable to multiply in this liquor, and died rapidly.
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