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“Enhanced Biodegradation of Chlorobenzenes in Groundwater”

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Environmental Strategies Corporation conducted an enhanced bioremediation pilot test for a confidential client at an industrial property in New Jersey. The pilot test was conducted to support the preparation of a Remedial Action Selection Report for groundwater at the site.

The constituents of interest at the site include a mix of chlorinated volatile organic compounds (CVOCs), predominantly chlorinated aromatics (chlorobenzene and dichlorobenzene isomers) and to a lesser extent, chlorinated aliphatics (trichloroethene, 1,2-dichloroethane, and tetrachloroethane). The pilot-test system was designed to enhance both direct and co-metabolic aerobic oxidation of the CVOCs.

Direct oxidation was enhanced by injecting air to provide dissolved oxygen in the groundwater. Co-metabolic oxidation was enhanced by providing methane as a substrate mixed with the air to stimulate the growth of methanotrophs. Co-metabolic oxidation of chlorobenzene and dichlorobenzene isomers, which are readily degraded by direct aerobic oxidation, has not been extensively examined. The primary aim of the bioremediation approach at the site was to stimulate growth of a mixed culture of indigenous aerobic bacteria that are capable of degrading all or a majority of the CVOCs present in the site groundwater. A practical monitoring program that included observation of groundwater geochemistry, bacterial enumeration, and contaminant concentration reduction indicated that the test objectives were achieved.
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Document Type: Research Article

Publication date: 01 January 2002

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