Affiliation:
1. Fermentation Technology Laboratory, Indian Institute of Science, Bangalore, India
Abstract
A comparative estimation of the coliform population of raw sewage, activated sludge, and the effluent derived therefrom revealed that raw sewage had a preponderance of
Escherichia coli
(75%), as compared with 25 and 30%, respectively, in sludge and effluent. Nitrogen-free mannitol-sucrose enrichments of activated sludge resulted in the isolation of
Azotobacter agilis, Aerobacter aerogenes, Corynebacterium laevaniformans
, and an
Achromabacter
species. Sludge had a large population of
C. laevaniformans
and
A. aerogenes
but not of
Azotobacter
. The bacterial parasites,
Bdellovibrio
and bacteriophages, were not active during activated-sludge treatment. A 10-fold reduction in phage content occurred after 2 hr of aeration, but the
Bdellovibrio
population was unaffected.
Publisher
American Society for Microbiology
Subject
General Pharmacology, Toxicology and Pharmaceutics,General Immunology and Microbiology,General Biochemistry, Genetics and Molecular Biology,General Medicine
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