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IMPACT OF TOXIC ORGANIC CHEMICALS ON THE KINETICS OF ACETOCLASTICMETHOGENESIS
Citation:
Davies-Venn, C., J. Young, AND H. Tabak. IMPACT OF TOXIC ORGANIC CHEMICALS ON THE KINETICS OF ACETOCLASTICMETHOGENESIS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-90/137.
Description:
A knowledge of the effect of toxic organic chemicals on thebiotransformation characteristics of organic co-susbstrates isessential for predicting the impact of these chemicals in anaerobicprocesses. ench-scale tests were conducted to assess the impactof toxic organic chemicals on the kinetics of acetoclasticmethanogenesis and to determine the relationship between kineticparameters obtained under non-toxic and toxic conditions. computer model based on a finite difference non-linear leastsquares algorithm was used to calculate the kinetic parameters byobtaining a best-fit of the experimental data to theMichaelis-Menten substrate utilization model. esulting kineticcoefficients revealed significant changes in both the maximum rateof acetate conversion, k, and the half-velocity coefficient, ks,when using both chlorophenols and chloroanilines. herefore, mixedinhibition was occurring. owever, non-competitive mechanismspredominated with chemicals containing the 2-chloro functionalgroup while competitive mechanisms seemed to predominate with the3- and 4-chloro functional groups.