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Engineered Approaches to In Situ Bioremediation of Chlorinated Solvents
<br /> Exhibit 3-1 : Components of In Situ Bioremediation Technology
<br /> Biodegradation Mechanisms
<br /> Component Example Supported Targeted CAHs Case Study Sitesr
<br /> Bioaugmentation Seed the subsurface with non-native, Aerobic oxidation (cometabolic and TCE, DCE, TCA, None
<br /> CAH-degrading bacteria direct) DCA, CA, CT, CF
<br /> Anaerobic reductive dechlorination TCA, DCA, CA, CT, Dover Area 6
<br /> (cometabolic and direct) CF, CM !i
<br /> Addition of Add nitrogen, phosphorus, or other Aerobic oxidation (cometabolic and TCE, DCE, TCA, SRS; Watertown
<br /> Nutrients growth factors that may be deficient in the direct) DCA, CA, CT, CF
<br /> subsurface
<br /> Anaerobic reductive dechlorination TCA, DCA, CA, CT, Texas Gulf; Dover Area 6
<br /> (cometabolic and direct) CF, CM
<br /> Addition of Add a substrate, such as toluene, propane, Aerobic oxidation (cometabolic) TCE, DCE, TCA, Moffett Field; Edwards AFB; SRS;
<br /> Electron Donors or methane CF, MC Watertown; Dover Building 719
<br /> Add hydrogen, a hydrogen source, or a Anaerobic reductive dechlorination PCE, TCE, DCE, Texas Gulf, Avco Lycoming; Emeryville;
<br /> hydrogen release compound (cometabolic and direct) VC, TCA, DCA, CA, Watertown; Dover Area 6
<br /> CT, CF, MC
<br /> Addition of Add oxygen by bioventing, biosparging, Aerobic oxidation (direct) TCE, DCE, VC, Moffett Field; Edwards AFB; SRS;
<br /> Electron or adding an oxygen source such as TCA, DCA, CA, CE, Watertown; Dover Building 719
<br /> Acceptors hydrogen peroxide MC, CM
<br /> Add an anaerobic reductant such as nitrate Anaerobic reductive dechlorination PCE, TCE, DCE, None
<br /> (cometabolic) VC, DCA, CT
<br /> Source: IMC, 1998; Leeson, 1999; Sewell, 1998: U.S. Air Force, 1998
<br /> Y
<br /> 1 Case studies provided in Appendix A of this report are cited as examples of each of the technologies.
<br /> 3-2
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