In-situ Aerobic Bioremediation of Recalcitrant Organics: A Case Study Demonstrating Benefits and Potential Limitations

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Abstract

A history of spills and/or releases at two adjacent dry cleaning facilties in the Houston, Texas area resulted in significant soil and shallow ground-water contamination. The soils at the adjacent properties (collectively called 'the Site') are relatively permeable allowing for rappid vertical migration at the source area(s) and lateral migration in the shallow ground water. The ground-water flow beneath the Site is relatively rapid, which resulted in a long, narrow, off-site plume. The off-site plume extended beneath a residential neighborhood causing concerns for potential vapor intrusion hazards, as well as property value considerations.

Initially, chemical oxidation was employed with only limited success in the areas of highest contamination. The response action was ammended to include enhanced aerobic bioremediation by cometabolism. This technology was selected as a ground-water treatment option based on the permeability, the natural aerobic conditions, and the benefit of reducing the risk of vinyl chloride accumulation.

Specialty microbes were introduced ......

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