Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Bacterial zoogloea formation /
Author Unz, Richard F. ; Farrah., Samuel R.
Other Authors
Author Title of a Work
Farrah, Samuel R.
CORP Author Pennsylvania State Univ., University Park. Dept. of Civil Engineering.;Environmental Protection Agency, Washington, D.C. Office of Research and Development.
Publisher U.S. Environmental Protection Agency,
Year Published 1974
Report Number EPA-670/ 2-74-018; EPA-17050-DBI
Stock Number PB-235 023
OCLC Number 07892199
Additional Subjects Pseudomonadaceae ; Activated sludge process ; Bacteria ; Flocculating ; Sewage treatment ; Aerobic processes ; Zoogloea ramigera
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 670-2-74-018 Headquarters Library/Washington,DC 03/28/2011
EJBD  EPA 670-2-74-018 c.1 Headquarters Library/Washington,DC 05/17/2013
ELBD  EPA 670-2-74-018 AWBERC Library/Cincinnati,OH 11/20/1998
NTIS  PB-235 023 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation xi, 87 pages : illustrations ; 27 cm
Activated sludge flocs suspended in wet mounts on microscope slides were observed to sprout, finger-like, bacterial zoogloeae as a consequence of the outgrowth of bacteria from flocs. Photomicrographic and fluorescent antibody studies revealed that the bacterial zoogloeae consisted of the progeny of specific zoogloea-forming bacteria. Purified exopolymers of Zoogloea strains and domestic activated sludge contained two amino sugars, one of which was identified as glucosamine. Zoogloea exopolymer was not fibrilar or cellulosic and contained approximately 17 to 19 per cent amino sugar and about one per cent hexoses, uronic acids and ether soluble substances on a dry weight of polymer basis. Amino sugar production was found to parallel zoogloea formation by Zoogloea sp. Calcium ion appeared to augment flocculation of bacterial cells capable of undergoing natural coalescence. Two cell types, described as rough and smooth colony-forming, were found in some strains of Zoogloea. Rough cells readily flocculated in agitated cultures whereas smooth cells produced relatively turbid cultures under similar growth conditions.
Bibliography ; p. 79-84.