Record Display for the EPA National Library Catalog

RECORD NUMBER: 396 OF 751

OLS Field Name OLS Field Data
Main Title Microbial Release of Soluble Phosphate in an Activated Sludge Environment.
Author Randal, Clifford W. ; Hulche, Bruce S. ; Marshal, Duane W. ;
CORP Author Virginia Polytechnic Inst. and State Univ., Blacksburg. Water Resources Research Center.
Year Published 1971
Report Number VPI-WRRC-Bull-36; OWRR-A-024-VA; 12065,; A-024-VA(4)
Stock Number PB-202 583
Additional Subjects ( Sewage treatment ; Phosphates) ; ( Activated sludge process ; Phosphates) ; ( Chemical removal(Sewage treatment) ; Phosphates) ; Concentration(Composition) ; Microorganisms ; Aeration ; Dissolved gases ; Oxygen ; Process variables ; Thickeners(Materials) ; Additives ; pH ; Desorption ; Aluminum oxides ; Adsorbents ; Water pollution control
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-202 583 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 48p
Abstract
Laboratory trials indicated that the release of soluble phosphates from activated sludge occurs primarily under anaerobic conditions. The rate of release was relatively independent of chemical environment, but corresponded to the expected death rate of microorganisms. The rapid release coincided with zero DO concentration. The release was retarded by the presence of organic substrate at the start of anoxia, but was accelerated with a higher concentration of mixed liquor suspended solids. Disruption of microbial cells is the major harmful effect of the phosphate release. Fixation of wastewater phosphorus by activated alumina is a desirable practice as it exerts no toxic influence on microorganisms.