Pond Sludge : Electrokinetics , Carbon Dioxide Extraction , and Supercritical Water Oxidation

نویسندگان

  • Edward A. Hamilton
  • Michael A. Matthews
چکیده

At DOE sites, significant amounts of Job Control Waste (JCW) need to be disposed. This JCW is generated and contaminated with polychlorinated biphenyls (PCBs) during clean-up operations. A commercial, plant-based absorbent material, “Toxi-dry”, is used extensively for decontamination and decommissioning of DOE waste sites and is classified a hazardous JCW after use. In this investigation, 1,2,4trichlorobenzene (TCB) was chosen as the surrogate for PCBs. As a promising separation technology, supercritical fluid extraction (SFE) was investigated for removing and recovering PCBs from contaminated of JCW. TCB was extracted from Toxi-dry using both pure and modified supercritical carbon dioxide. It was found that at constant pressure, increasing temperature from 40 C to 80 C greatly improved the recoveries, while the pressure effect of SFE was not as clear as the temperature effect. With 5wt % acetone or ethanol added as cosolvent, the efficiency of SFE of TCB was also significantly improved.

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تاریخ انتشار 2002