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 4 mm. 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 0.02 h^-1 for Ash and 0.003 h^-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 0.08 h^-1.

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We have previously revealed that Mercury was mostly emissioned in combustion gas as municipal refuse was combusted in a large scale incinerator and mercury species in combustion gas changed remarkably at different places of the incinerator.
At first, therefore, experimental studies were undertaken of the effects of gas temperature, HCl concentration and H₂O one to mercury species. Next, with reference to data obtained previously by measuring the combustion gas, chemical thermodynamic computation system (CTC/ SOLGASMIX) was applied to the combustion gas. The equilibrium calculation of 81 species in various phases was undertaken of the effects of gas temperature, HCI, H₂O and O₂ concentration and the component (NaCI, Zn) of fly ash.
Using the results computed and the experimental results, the changes of mercury species in the combustion gas were thermodynamically considered. The calculation time required was from 10 to 20 seconds each calculation condition and the method of operation was very easy. Therefore CTC/SOLGASMIX was found to be a very useful means of thermodynamic consideration of trace element in combustion gas.

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Electric furnace slags are classified into two groups; each is produced during the process of extracting the impurities from molten steel and controling the quality of steel, one by oxidizing, the other by reducing. Reducing slag has the two styles, one is powdered and the other is blocked. Powdered reducing slag has hardening properties by hydration, however, their properties are dependent by the steel making condition. In this study, the hardening properties and the promotion of this properties for reducing stags produced by different steel making plants were observed.
It has been seen that the hardening properties of reducing slag are caused by the hydrates created from 12 CaO⋅7 Al₂O₃ that is the one of the crystals constituting redusing slag and mixing gypsum (CaSO₄⋅2 H₂O) have promoted largely the hadening properties of reducing slag by created hydrate (3 CaO⋅Al₂O₃⋅3 CaSO₄⋅32 H₂O) from 12 CaO⋅7 Al₂O₃ and CaSO₄⋅2H₂O.
By mixing of the industrial solid waste containing CaSO₄⋅2H₂O, the hardening properties of reducing slag were promoted largely likewise mixing CaSO₄⋅2H₂O only.

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