Microbial ecology of activated sludge I. Dominant bacteria

Dias, F. F. ; Bhat, J. V. (1964) Microbial ecology of activated sludge I. Dominant bacteria Applied and Environmental Microbiology, 12 (5). pp. 412-417. ISSN 0099-2240

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Official URL: http://aem.asm.org/cgi/content/abstract/12/5/412


Over 300 bacterial strains were isolated from seven samples of activated sludge by plating on sewage agar. Gram-negative bacteria of the genera Zoogloea and Comamonas predominated. Many isolates (51%) showed sudanophilic inclusions of poly-β-hydroxybutyric acid, whereas 34% accumulated iodophilic material on media containing starch. A large number required either vitamins or amino acids, or both, for growth. None of the isolates tested for their ability to bring about changes in autoclaved sewage produced an effluent comparable in quality to the activated sludge control, although the Zoogloea did produce activated sludgelike flocs. A study of 150 bacterial strains isolated from raw sewage revealed that they differed from the sludge isolates in several respects. Coliforms, which constitute nearly a quarter of the sewage isolates, were rarely encountered in sludge.

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Source:Copyright of this article belongs to American Society for Microbiology.
ID Code:4570
Deposited On:18 Oct 2010 07:30
Last Modified:16 May 2016 15:12

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