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The Ecology and Role of Protozoa in Aerobic Sewage Treatment Processes

The Ecology and Role of Protozoa in Aerobic Sewage Treatment Processes Two major aerobic biological processes are used commonly throughout the world to treat settled sewage: percolating filters and the activated-sludge process. Both processes rely upon the growth of microorganisms to remove unacceptable substances dissolved or suspended in sewage and in some cases to convert them into more acceptable compounds. In percolating filters, the sewage is allowed to trickle over inert surfaces (coke, clinker, plastics media, etc) upon which the microbes grow to form an attached microbial film. The activated-sludge process, however, is a truly aquatic process where the sewage and organisms are aerated together in tanks for several hours. The organisms form flocculent growths or activated sludge, which may then be easily separated from the effiuent in sedimentation tanks to be recycled back to the aeration tank. Excess solids produced in these 0066-4227/82/1001-0027$02.00 CURDS aerobic processes may be treated in anaerobic digesters that use methano­ genic bacteria. A full account of sewage-treatment processes is given else­ where (39). Although it has been known for many years that these two aerobic biological sewage-treatment processes contain animal and plant life from many phyla, the roles played by the various individual groups of organisms in the purification processes in many cases http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annual Review of Microbiology Annual Reviews

The Ecology and Role of Protozoa in Aerobic Sewage Treatment Processes

Curds, C R
Annual Review of Microbiology , Volume 36 (1) – Oct 1, 1982
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Publisher
Annual Reviews
Copyright
Copyright 1982 Annual Reviews. All rights reserved
Subject
Review Articles
ISSN
0066-4227
eISSN
1545-3251
DOI
10.1146/annurev.mi.36.100182.000331
pmid
6816137
Publisher site
See Article on Publisher Site

Abstract

Two major aerobic biological processes are used commonly throughout the world to treat settled sewage: percolating filters and the activated-sludge process. Both processes rely upon the growth of microorganisms to remove unacceptable substances dissolved or suspended in sewage and in some cases to convert them into more acceptable compounds. In percolating filters, the sewage is allowed to trickle over inert surfaces (coke, clinker, plastics media, etc) upon which the microbes grow to form an attached microbial film. The activated-sludge process, however, is a truly aquatic process where the sewage and organisms are aerated together in tanks for several hours. The organisms form flocculent growths or activated sludge, which may then be easily separated from the effiuent in sedimentation tanks to be recycled back to the aeration tank. Excess solids produced in these 0066-4227/82/1001-0027$02.00 CURDS aerobic processes may be treated in anaerobic digesters that use methano­ genic bacteria. A full account of sewage-treatment processes is given else­ where (39). Although it has been known for many years that these two aerobic biological sewage-treatment processes contain animal and plant life from many phyla, the roles played by the various individual groups of organisms in the purification processes in many cases

Journal

Annual Review of Microbiology – Annual Reviews

Published: Oct 1, 1982

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