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BIOREMEDIATION TREATABILITY STUDIES OF CONTAMINATED SOILS AT WOOD PRESERVING SITES
Grosse*, D W., E SahleDemessie*, AND E R. Bates*. BIOREMEDIATION TREATABILITY STUDIES OF CONTAMINATED SOILS AT WOOD PRESERVING SITES. Remediation Journal. John Wiley & Sons Incorporated, New York, NY, 10(3):67-84, (2000).
Bioremediationis used frequently at sites contaminated with organic hazardous chemical where releases from processing vessels and the mismanagement of reagents and generated waste have contributed to significant impairment of the environment. At wood treater sites, process reagents such as pentachlorophenol, and creosote have adversely impacted the surrounding soil and groundwater. WHen PCP has been used at these sites, polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) are typically found. Where creosote has been used as the wood preservative of choice, polynuclear aromatic hydrocarbons (PAHs) commonly are found. Many of these compounds are considered to be persisten, bioaccumulative and toxic (PBT) and are particularly recalcitrant. The primary focus for the use of bioremediation at wood treater sites is to decontaminate the recalcitrant compounds associated with the former use of PCP and creosote. Since bioremediation has shown effectiveness in degrading organic contaminants, OSWER has selected it as one of the four presumptive remedies for cleaning up wood preserving sites. This article discusses recent advances in the state-of-the-science in applying enhanced bioremediation. Information derived from treatability studies, case studies and demonstration projects supported by NRMRL focusing on 3 different applications of bioremediation were evaluated: land farming; slurry-phase; and bioaugmentation. Although, the land farming treatability study (with & without manganese oxide amendment) showed inconclusive results, the demonstration project yielded total carcinogenic PAH removal rates >82%, after 400 days of treatment for 2 land treatment units. Based upon the treatment of 45000 yd3, at $35/yd3 of contaminated soil. Pilot-scale slurry-phase bioremediation utilizing a 1125 m3 reactor yielded total mean removal rates of total PAHs >87% at $145/yd3. Treatability studies evaluating biotreatment augmentedby Fentons Reagent for a mixed s