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COMBINED CHEMICAL AND BIOLOGICAL OXIDATION OF SLURRY PHASE POLYCYCLIC AROMATIC HYDROCARBONS
Citation:
Davila, B., K. Brown, J. Sanseverino, M. Thomas, C. Lang, J. Rightmayer, K. Hague, AND T. Smith. COMBINED CHEMICAL AND BIOLOGICAL OXIDATION OF SLURRY PHASE POLYCYCLIC AROMATIC HYDROCARBONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-95/065.
Description:
Bioslurry treatment of polycyclic aromatic hydrocarbon (PAH)-impacted soils was demonstrated under the Superfund Innovative Technologies Evaluation (SITE)/Emerging Technologies Program (ETD) as an extension of research previously funded by IT Corporation (IT) (Brown and Sanseverino, 1993) and additional investigations supported by the U.S. Environmental Protection Agency (EPA) (Davila et al., 1994). uring the demonstration, IT operated two 60-liter (L) TEKNO Associates bioslurry reactors (Salt Lake City, Utah) and a 10-L fermentation unit in semicontinuous, plug-flow mode for a 2-month period. he first 60-L reactor received fresh feed daily and supplements of salicylate and succinate to enhance PAH degradation. ffluent from the first reactor was fed to the second 10-L reactor in series, where Fenton's reagent was added to accelerate oxidation of four- to six-ring PAH. he third reactor in series was used as a polishing reactor for the removal of any partially-oxidized contaminants remaining following addition of Fenton's reagent. uring operation, the bioslurry reactor system demonstrated average PAH and carcinogenic PAH (CPAH) removals of 84 and 66 percent, respectively. he reactors will be operated over the next four months to increase the rate and extent of PAH biodegradation. he objective of the demonstration is to illustrate bioslurry treatment of impacted soils and sludges as an effective and economically attractive remedial option.