Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Disinfection of Filtered and Unfiltered Secondary Effluent in Two Ozone Contactors.
Author Venosa, A. D. ; Meckes, M. C. ; Opatken, E. J. ; Evans, J. W. ;
CORP Author Municipal Environmental Research Lab., Cincinnati, OH.
Year Published 1981
Report Number EPA-600/J-80-374;
Stock Number PB82-154840
Additional Subjects Waste water ; Disinfection ; Ozone ; Bacteria ; Coliform ; Microorganisms ; Bactericides ; Reprints ; Water pollution control
Library Call Number Additional Info Location Last
NTIS  PB82-154840 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 14p
The objective of this study was to evaluate the effect of filtration of secondary effluent on the mass transfer and disinfection efficiencies of two ozone contactors. The two contactors used in the comparison were a multicolumn bubble diffuser and a stirred tank reactor. The approach chosen was based on a type of statistical experimental design used in a previous contactor comparison. The design made it possible to compare the ozone transfer and coliform reduction efficiencies of the two contactors with respect to applied dose, while at the same time comparing filtered and unfiltered effluent. Results indicated that better mass transfer efficiency and, consequently, better coliform reduction efficiency occurred in the bubble diffuser, and the differences between contactors increased with dose. Mass transfer in both contactors was higher in unfiltered effluent than in filtered effluent. The most signficant factors affecting the fecal coliform numbers in the treated secondary effluent were total chemical oxygen demand (COD) and absorbed ozone dose. Regression equations were developed to predict final coliform numbers as a function of COD and absorbed ozone dose.