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Engineered Approaches to In Situ Bioremediation of Chlorinated Solvents <br /> Exhibit 2-8: Selected Information on CAH Degradation Mechanisms <br /> Degradation <br /> Mechanism CAA Conditions Reported Bacteria Reported Rate Data Product Source <br /> AEROBIC OXIDATION <br /> Aerobic oxidation DCE, VC Aerobic Not reported Observed god-order Michaelis-Menton CO2 Bradley and <br /> (direct) kinetics (V. = 5. l and 12.4 Chapelle 1998 <br /> umol/IJD for DCE and VC, <br /> respectively) <br /> DCE, VC, DCA, Aerobic Not reported Not reported CO2 RTDF 1997 <br /> CA, MC, CM <br /> Aerobic oxidation TCE Aerobic, electron donor (phenol, Burkholderia cepacia G4, Not reported CO2 Munakata-Marr <br /> (cometabolic) toluene; benzene) PRi2e, 1997; McCarty <br /> and others 1998 <br /> TCE Aerobic, electron donor (toluene) Not reported V order Not Petrovskis and <br /> 0.26-0.4 mold reported others 1995 <br /> TCE, DCE, VC, Aerobic, electron donor Not reported Not reported CO2 RTDF 1997 <br /> TCA, CF, MC (methane, aromatics, ammonia) <br /> ANAEROBIC REDUCTIVE DECHLORINATION <br /> Anaerobic reductive PCE, TCE, DCE, Anaerobic, electron donor PER-K23, Dehalospirillium Zero-order dechlorination kinetics for Ethene, Hollinger 1993; <br /> dechlorination VC, DCA (hydrogen or samentive multivorans, Dehalohacter PCE, TCE, cis-DCE and first-order ethane Smatlak 1996; <br /> (dehalorespimtion) hydrogen source),.relatively low restricras, Dehalococcus for trans-DCE and VC; total Tandol 1994; <br /> Hydrogen partial pressure ethenogenes degradation of -4.6 umol PCE/mg Yager 1997; <br /> VSS/day ITRC 2000 <br /> TCE Anaerobic, electron donor Alcaligenes: (for example, Michaelis-Menton kinetics Ethene Harkness and <br /> (lactate, methanol butyrate, hydrogenopheya present in others 1999 <br /> glutamate 1,2-propanediol, culture derived from soil) <br /> toluene) <br /> PCE, TCE, c- Anaerobic, electron donor Not reported Michaelis-Menton kinetics Not ff <br /> DCE, VC (Hydrogen, propionate or lactate) reported <br /> PCE Anaerobic, electron donor Not reported 1 .24 mg PCE mg /volatile suspended Not(methanol) solids (VSS)/d reported <br /> ICE Not reported Not reported I" order 0.2-4.8 yr' Not reported <br /> DCE Not reported Not reported I " order 0.5-9.4 yr' Not Wilson and others <br /> re otied 1996 <br /> 2- 10 <br />