Review on Destruction Technology of Polychlorinated Biphenyls in Transformers in Korea

Review on Destruction Technology of Polychlorinated Biphenyls in Transformers in Korea
정종수진성민박은석S.G. Shim
Transformer; Transformer Oil; Polychlorinated Biphenyl (PCBs); Dechlorination process; solvent cleaning; Residual PCBs concentration
Issue Date
International Conference on Thermal Treatment Technologies & Hazardous Waste Combustors
A brief review of current status in the field of Polychlorinated biphenyl (PCBs) treatment in Korea is presented in this paper. The number of pole transformers in Korea, mainly in the Korea Electric Company, is approximately 1.6 million, 50~100 thousands of those are disposed annually. About 6,000~30,000 tons of used transformers will be treated safely every year. Chemical treatment of PCBs-contaminated transformer oil and solvent cleaning of transformers have been started from the summer of 2009. Now 2,000 tons of used transformers are treated in Korea monthly, which costs approximately 3 billion Korean Won. Three commercially operating facilities are equipped with both chemical destruction of PCBs in transformer oil and cleaning of transformers. All of chemical destruction facilities of PCBs in Korea are dechlorination process of PCBs by sodium dispersion process, with different dechlorination agents, such as metallic sodium. Final guideline of chemical destruction is 2 ppm of PCBs in residual oil, which is analyzed by a peak pattern method. Cleaning facilities of PCBs-contaminated transformer generally use the solvents, such as surfactants or hydrocarbons, to clean the outer case and the inner core.
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