You are here:
SOLVENT WASHING OF PCP CONTAMINATED SOILS WITH ANAEROBIC TREATMENT OF WASH FLUIDS
Citation:
Khodadoust, A., J. Wagner, M. Suidan, AND S. Safferman. SOLVENT WASHING OF PCP CONTAMINATED SOILS WITH ANAEROBIC TREATMENT OF WASH FLUIDS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/062 (NTIS PB94160439).
Description:
A solvent washing procedure for the removal of pentachlorophenol (PCP) from contaminated soils is presented. his procedure can be used in both in-situ and above ground soil washing applications. he in-situ solvent washing (flushing) of soil was simulated by continuously flushing solvent through a packed bed of soil until the effluent concentrations decrease to below the detection limit. he above ground (ex-situ) soil washing was simulated by batch tests (reverse isotherms) conducted on PCP contaminated soil. cetone was found to be less effective than ethanol in flushing PCP from contaminated soil. oil solvent flushing was evaluated on 20x40, 60x80, and 100x140 U.S. Mesh size soil fractions loaded with 100 ppm of PCP. he flushing solvent, 95% ethanol, was applied at three different flow rates. ower solvent flow rates were more effective, for the same solvent throughput, than higher flow rates in extraction PCP thus suggesting that desorption kinetics were rate limiting. he 20x40 U.S. Mesh soil was flushed with various ethanol/water mixtures; the 75% ethanol solution removed more PCP than other mixtures. atch extraction tests, conducted on 20x40,100x140 U.S. Mesh size soil and clay fraction of the same soil, revealed that 50% and 75% ethanol/water solutions consistently removed the highest amounts of PCP. he wash fluids were fed to an expanded-bed anaerobic granular activated carbon (GAC) bioreactor, where the PCP content of the wash fluid was biodegraded and the ethanol served as the primary substrate.
