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Pilot-Scale Demonstration of a Slurry-Phase Biological Reactor for Crosote-Contaminated Soil

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Bioslurry Reactor ECOVA Corporation (2,534K)


U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Bioslurry Reactor
ECOVA Corporation

ABSTRACT

ECOVA’s slurry-phase bioremediation technology aerobically degrades polyaromatic hydrocarbons (PAHs) from creosote and other wastes in soils, sediments, and sludges. The goal is to convert organic wastes into relatively harmless by-products of microbial metabolism, such as carbon dioxide, water, and inorganic salts. Batch and continuous-flow bioreactors are supplemented with oxygen, nutrients, and a specific inoculum of enriched indigenous microorganisms to enhance biodegradation. Biological reaction rates are accelerated due to the increased contact efficiency between contaminants and microorganisms. The system is designed to treat highly contaminated wastes; operational parameters such as pH, dissolved oxygen, and temperature are controlled to optimize microbial activity. The technology was demonstrated from May through September 1991 at EPA’s Test and Evaluation Facility in Cincinnati, Ohio. Treatment significantly improved biodegradation rates of carcinogenic 4- to 6-ring PAHs. The bioslurry reduced soil-bound PAHs by 82 ± 15 percent in the first week. After 14 days, total PAHs had been reduced by 96 ± 2 percent. A 97 ± 2 percent reduction was observed over a 12-week period. The technology is no longer available through EVOVA, but is being implemented by Walsh Environmental Scientists & Engineers.


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Posted June 22, 1999

 

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