Phototrophic purple and green bacteria in a sewage treatment plant.

  title={Phototrophic purple and green bacteria in a sewage treatment plant.},
  author={E. Siefert and R L Irgens and Norbert Pfennig},
  journal={Applied and environmental microbiology},
  volume={35 1},
In all purification stages of a biological sewage treatment plant, phototrophic bacteria were detected by the method of viable cell counts. The predominant species identified belonged to the genus Rhodopseudomonas of purple nonsulfur bacteria. The number of phototrophic bacteria was highest in wastewater containing sludge. In activated sludge, an average of 10(5) viable cells/ml was found; the number depended upon concentration of sludge rather than on seasonal changes in light conditions in… CONTINUE READING

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