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BIOLOGICALLY ENHANCED OXYGEN TRANSFER IN THE ACTIVATED SLUDGE PROCESS (JOURNAL)
Citation:
Mueller, J. S. AND H. D. Stensel. BIOLOGICALLY ENHANCED OXYGEN TRANSFER IN THE ACTIVATED SLUDGE PROCESS (JOURNAL). M. K. Stenstrom, S. G. Pavlostathis, R. Y. Surampalli (ed.), JOURNAL OF THE WATER POLLUTION CONTROL FEDERATION. Water Environment Federation, Alexandria, VA, 62(2):193-203, (1990).
Impact/Purpose:
To perform bench- and full-scale plant studies to compare the results of in situ OUR measurement techniques to BOD bottle OUR measurements.
Description:
Biologically enhanced oxgyen 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. The BOD bottle OUR values accurately described in situ OURs for endogenous respiration conditions with non-limiting DO concentrations. These results suggest that previously observed biologically enhanced oxygen tranfer was not actually occurring but was the result of the BOD bottle test method and activated sludge operating condition.
