How to: Bioremediate chlorinated solvents without accumulating metabolites

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Chlorinated volatile organic compounds (CVOCs)such as tetrachloroethylene (PCE) and trichloroethylene(TCE), commonly used as dry cleaningsolvents and degreasers, pose an ongoing threatto human health and wildlife when spilled intogroundwater. Through the injection of bioremediation productsinto the impacted groundwater, the chlorine atoms can be removedfrom these compounds in situ. However, depending on the treatmentpathway, varying amounts of more harmful by-products canbe formed, such as cis-dichloroethylene (cis-DCE) and vinyl chloride(VC). Site owners, C&E firms and regulators are realizing thatthe ability to effectively treat the original contaminants, while minimizingformation of harmful by-products, is an important aspect ofperforming permanent and responsible in situ bioremediation.

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