PROCESS FOR THE SUPERCRITICAL WATER OXIDATION OF TRANSFORMER OIL CONTAMINATED WITH POLYCHLORINATED BIPHENYLS

摘要

A treatment process of waste transformer insulating oils contaminated with polychlorinated biphenyls by supercritical water oxidation technology is provided to remove polychlorinated biphenyls with a high concentration, prevent corrosion of materials due to chlorine ions, and make it not necessary to use a neutralizer such as NaOH or KOH, or install post-treatment facilities. A treatment process of a waste transformer insulating oil contaminated with polychlorinated biphenyls by supercritical water oxidation technology comprises the steps of: mixing a waste transformer insulating oil contaminated with polychlorinated biphenyls with a mixture of water and 0.1 to 0.5 wt.% of an emulsifier in which polyethylene glycol 1000, polyethylene glycol 2000, and 3 moles of polyoxyethylene lauryl ether are bladed at a ratio of 1:1:1, thereby diluting the waste transformer insulating oil such that 1 to 5 wt.% of the waste transformer insulating oil is contained in the total mixture; and oxidation decomposing the diluted waste transformer insulating oil into water and carbon dioxide using an oxidizer under supercritical oxidation conditions of a reaction temperature of 475 to 525 deg.C, a reaction pressure of 3,600 to 3,800 psi, an oxygen amount of 150 to 300%SA, and a retention time of 60 to 90 seconds in a supercritical water oxidation apparatus comprising a vessel reactor and a tubular reactor, or comprising the tubular reactor only.