Nobutoshi Tanaka, Donghoon Lee*, Toshihiko Matsuto and Keiichi Koyama

(Department of Environmental and Sanitary Eng., Faculty of Eng., Hokkaido Univ. * Present post: National Institute of Public Health)

Abstract

Trichloroethylene (TCE), one of hazardous non-ionic organic compounds, has the special characteristics in reaction with solid wastes. Such hazardous compounds have caused some groundwater pollution problems through the leachate spill from sanitary landfill sites of solid waste. There is few study on the behavior of non-ionic organic compounds in solid waste layer, but we have presented a series of papers about the distribution and transportation characteristics of TCE among solid waste, water and gas phase recently. This paper describes the study on TCE decomposition and sorption kinetics in incinerator ash (Ash) and size-reduced incombustible refuse (SRR), of which diameters are both less than 4mm. TCE transportation with saturated-water flow together with decomposition in the solid waste layer is also studied. Consequently, the specific rate constants of first-order TCE decomposition reaction by the solid wastes were about 0.02h-1 for Ash and 0.003h-1 for SRR, respectively. However the reaction of TCE with solid wastes should be examined still in detail. The validity of the parallel (equilibrium plus kinetic) model for sorption kinetics of TCE into solid phase was shown. For the both wastes the fraction of instantaneous equilibrium sorption was about 0.3 and the overall TCE transfer capacity coefficient was about 0.08h-1.

Key words: solid waste landfill site, trichloroethylene, solute transportation, sorption kinetics, decomposition kinetics