抄録
Polychlorinated biphenyls(PCBs), the most important compound of POPs, are managed in an environmentally sound manner and by the year 2025, every country should take actions to remove PCBs found above certain thresholds. The goal in Korea is totally remove PCBs by 2015. There exist various chemical treatments of PCBs. Among these, We selected SDMA(sodium bis(2-methoxyethoxy)aluminum hydride) and cobalt catalyst, which had been reported to have rapid reaction time and high efficiency. This objectives of this study were to determinate the optimal operation condition and major variables of PCBs dechlorination by applying different SDMA and catalyst loads, hydrogen donors, temperatures. In this work, target compounds were Aroclor products(Aroclor 1242, 1254). Through the series of experiments, following conclusions were drawn. The described method of using SDMA and cobalt catalysts is suitable for fast, safe and complete dechlorination of PCBs. The optimal operation condition was at 110°C with the use of SDMA in a certain mole ratio(nNa : nCl = 50 : 1) and with Co(acac)2 in less than the stoichiometric amount of Cl(nCo(acac)2 : nCl = 0.1 : 1) . The decomposition of PCBs with the SDMA in the presence of cobalt catalysts occurred rapidly in early stage. The SDMA was considered more effective than catalysts in terms of decomposition efficiencies of PCBs. Dechlorination efficiency of TEQ concentration was higher than those of total concentration, because there was a shift in the isomer profile from higher to lower chlorinated biphenyls. The dechlorination method reported in the present study may be considered a useful alternative of chemical treatment technology of PCBs in Korea.
