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Progress in Chemistry 2007, Vol. 19 Issue (9): 1275-1281 Previous Articles   Next Articles

• Review •

PCBs Treatment by Sub-Supercritical Water Catalytic Oxidation, Thermolysis and Reduction

Wei Chaohai**;Yan Bo;Hu Chengsheng   

  1. College of Environmental Science and Engineering, South China University of Technology, Guangzhou, 510640,China
  • Received: Revised: Online: Published:
  • Contact: Wei Chaohai
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The major sources and environmental hazards of PCBs are briefly introduced. The reaction pathways and decomposition efficiencies of PCBs in Supercritical Water (SCW) are reviewed in terms of Supercritical Water Oxidation (SCWO), Supercritical Water Thermolysis (SCWT), and Subcritical Water Reduction (SCWR). The mechanisms of decomposition and dechlorination of PCBs on account of the action of cosolvent with methanol or benzene, alkali catalyst with sodium carbonate or sodium hydroxide and oxidant with sodium nitrate and sodium nitrite are summarized. The diffirences about the promotion mechanism of methanol to PCBs decomposition are found between SCWO and SCWT. The dechlorination reaction was accelerated due to the decrease of HCl which produced in the dechlorination process by the neutralisation of HCl with alkali catalyst. The corrosion problem of reactor and cost-effectiveness during the process of SCWO PCBs are discussed. The research trends for the future in SCWO PCBs are proposed.
Key words: polychlorinated biphenyls(PCBs), supercritical water, subcritical water, oxidation, thermolysis, reduction

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