Superfund Innovative Technology Evaluation (SITE)
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| Innovative Methods
for Bioslurry Treatment IT Corporation
IT has used the Bioslurry Slurry Reactor (developed by Tenko Associates, Salt Lake City, Utah) to treat soil contaminated with polyaromatic hydrocarbons (PAHs). The first reactor mixes the contaminated soil with salicylate and succinate. Salicylate induces the naphthalene degradation, while succinate is a by-product of naphthalene metabolism and serves as a general carbon source. This reactor removes the easily degradable carbon and increases biological activity on the other PAHs. Effluent from the first reactor overflow into the second reactor where Fenton's reagent is added to accelerate oxidation for four- and six-ring PAHs. The third reactor is a polishing reactor to remove any partially-oxidized contaminants remaining after the addition of the Fenton's reagent. Operation of the reactors increases the rate and extent of PAH biodegradation, making bioslurry treatment an effective and economically attractive remediation option. A pilot-scale study was conducted when the technology was accepted into the SITE Emerging Technology Program in 1993. About 4,000 pounds of PAH-impacted soil, obtained from a wood-treating facility, was screened and treated during the summer of 1994. Carcinogenic-PAH and PAH removals were demonstrated at 84 and 95 percent, respectively.