Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Biologically Enhanced Oxygen Transfer in the Activated Sludge Process.
Author Mueller, J. S. ; Stensel, H. D. ; Brenner, R. C. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab. ;Washington Univ., Seattle. ;Manhattan Coll., Bronx, NY.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/491;
Stock Number PB91-196303
Additional Subjects Activated sludge process ; Aeration ; Biological treatment ; Sewage treatment ; Oxygenation ; Mass transfer ; Design criteria ; Performance evaluation ; Dissolved oxygen ; Biochemical oxygen demand ; Mathematical models ; In-situ processing ; Oxygen demand ; Reprints ; Oxygen uptake rate
Library Call Number Additional Info Location Last
NTIS  PB91-196303 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 13p
Biologically enhanced oxygen transfer has been a hypothesis to explain observed oxygen transfer rates in activated sludge systems that were well above that predicted from aerator clean-water testing. The enhanced oxygen transfer rates were based on tests using BOD bottle oxygen uptake rates (OURs) on samples removed from the activated sludge system. Bench- and full-scale plant studies were performed to compare results of in situ OUR measurement techniques to BOD bottle OUR measurements. The studies showed that the condition of low dissolved oxygen (DO) and high OUR for which the greatest enhanced oxygen transfer was reported resulted in OURs in the BOD bottle tests well above the actual in situ OURs. For high DO and high OUR activated sludge operating conditions, the BOD bottle OURs were below the actual in situ OURs. The BOD bottle OUR values accurately described in situ OURs for endogenous respiration conditions with nonlimiting DO concentrations. The results suggest that previously observed biologically enhanced oxygen transfer was not actually occurring but was the result of the BOD bottle test method and activated sludge operating condition.