Combined decontamination processes for wastes containing PCBs.
This project has focused on the development of a complex assembly of mutually corresponding technological units: a low temperature thermal process for the desorption of PCBs and other organics from soils and other contaminated solid wastes; the extraction of PCBs from soils by an ecological friendly aqueous solution of selected surfactants; the chemical decontamination of PCBs in oils and in-oil-in-water emulsions by metallic sodium and potassium in polyethylene glycols in the presence of aluminum powder; the modified alkaline catalyzed chemical decontamination of PCBs in oil-in-water dispersions in a solid-state reactor (in a film of reacting emulsion on solid carriers); and the breakdown of PCBs in aqueous emulsions with activated hydroxyl radicals enhanced by UV radiation. The processes operate in a closed loop configuration with effluents circulating among the process unit. These technologies have been verified at laboratory and pilot-plant scales.
Kastánek
Frantisek
F
Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 16502 Prague 6-Suchdol, Czech Republic. kastanek@icpf.cas.cz
Kastánek
Petr
P
D003666:Decontamination / Q000379:methods*; D004785:Environmental Pollutants / Q000302:isolation & purification*; D004787:Environmental Pollution / Q000517:prevention & control*; D006219:Halogens / Q000737:chemistry; D017665:Hydroxyl Radical / Q000737:chemistry; D011078:Polychlorinated Biphenyls / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
D004785:Environmental Pollutants; D006219:Halogens; D014874:Water Pollutants, Chemical; D014867:Water; D017665:Hydroxyl Radical; D012964:Sodium; D011078:Polychlorinated Biphenyls