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i <br /> ORC TECHNICAL BULLETIN # V.3 <br /> Oxygen Release Com ound ORC® <br /> p <br /> Uses in the Dual Phase Remediation <br /> of <br /> Chlorinated Hydrocarbons <br /> Chlorinated hydrocarbons, such as PCE and TCE, are among the most recalcitrant <br /> environmental contaminants Degradation mechanisms for these compounds are complex <br /> While there Ls some evidence of aerobic breakdown, most of the metabolic pathways are <br /> anaerobic Also, there are dual-phase requirements for complete remediation to <br /> dechlorinated endpoints - such that the process is initiated under anaerobic conditions and <br /> completed in the presence of oxygen ORC can be used at the various oxygen-dependent <br /> stages <br /> ORC Can be Useful as Part of a Dual Phase Chlorinated Remediation <br /> Phase 1 <br /> Anaerobic Degradation of PCE and TCE to DCE and VC <br /> I <br /> Phase 2 <br /> Aerobic Degradation of DCE and VC to CO2, HCl and H2O <br /> In some cases, oxygen is needed to specifically inhibit certain reactions - such as the <br /> formation of vinyl chloride - a degradation product that is far more dangerous than its <br /> source compounds The issue arises when sites are capped with clay and the resultant <br /> anaerobic conditions can promote the generation of vinyl chloride ORC as a preventative <br /> treatment may be appropriate at certain sites <br /> RECENESIS -------------------------------------------------------------------------------------------- <br /> Bioremediation Products 27130A Paseo Espada, Ste 1407, San Juan Capistrano, CA 92675 <br /> Phone 714-443-3136 Fax 714-443-3140 <br />