Record Display for the EPA National Library Catalog
RECORD NUMBER: 11 OF 20
|OLS Field Name||OLS Field Data|
|Main Title||Impact of toxic organic chemicals on the kinetics of acetoclastic methanogenesis /|
|Author||Davies-Venn, Christian. ; Young, J. C. ; Tabak, H. H.|
|CORP Author||Arkansas Univ., Fayetteville. Dept. of Civil Engineering.;Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.|
|Publisher||U.S. Environmental Protection Agency, Office of Research and Development, Risk Reduction Engineering Laboratory,|
|Report Number||EPA/600/D-90/137; EPA-R-814488-01-3|
|Subjects||Sewage--Purification--Biological treatment. ; Organic water pollutants. ; Methanobacteriaceae.|
|Additional Subjects||Biodeterioration ; Reaction kinetics ; Chlorine organic compounds ; Biomass ; Bacteria ; Mathematical models ; Molecular structure ; Solid waste disposal ; Toxic substances ; Biogas process|
|Collation||32 pages : illustrations ; 28 cm|
A knowledge of the effect of toxic organic chemicals on the biotransformation characteristics of organic co-substrates is essential for predicting the impact of these chemicals in anaerobic processes. Bench-scale tests were conducted to assess the impact of toxic organic chemicals on the kinetics of acetoclastic methanogenesis and to determine the relationship between kinetic parameters obtained under non-toxic and toxic conditions. A computer model based on a finite difference non-linear least squares algorithm was used to calculate the kinetic parameters by obtaining a best-fit of the experimental data to the Michaelis-Menten substrate utilization model. Resulting kinetic coefficients revealed significant changes in both the maximum rate of acetate conversion, and the half-velocity coefficient, when using both chlorophenols and chloroanilines. Therefore, mixed inhibition was occurring. However, non-competitive mechanisms predominated with chemicals containing the 2-chloro functional group while competitive mechanisms seemed to predominate with the 3- and 4-chloro functional groups.
"Henry H. Tabak, project officer." "Presented at the ACS Symposium on Chemical and Biochemical Detoxification of Hazardous Wastes II, Miami Beach, Florida on September 10-15, 1989." Includes bibliographical references. Microfiche.