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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 1097

Takahashi Rikiya, Tsuda Tsuyoshi, Kajikawa Takashi, Suzuki Masaharu, and Yoneyama Hitoshi; [Movement of oligotrophic bacteria in activated sludge]. Hakkokogaku 64(5):437-441, 1986

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Numbers and kinds activated sludge bacteria in a practical plant grown on full-strength agar medium and its 100-fold dilution were counted and related to their sludge volume indexes (SVI). Below 160 of the SVI, activated sludge samples contained large numbers of oligotrophic bacteria, which grow on the 100-fold dilution medium, and the ratios of the number of oligotrophs to the number of cells grown on full-strength medium was 1.6 to 2.9. This ratio decreased above 160 of the SVI. The numbers of oligotrophic bacteria in an experimental activated sludge which was cultivated with artificial wastewater containing sugar, decreased rapidly before bulking. These findings suggested that the bacterial constitution of activated sludge would be changed appreciably before sludge bulking.