| Co-Investigator(Kenkyū-buntansha) |
TUDA Shingo Hadano City, Department of Environment, Chief Clerk., 環境部, 係長(研究職)
FUSHIWAKI Yuichi Kanagawa Environmental Research Center, Chief Investigater, 主任研究員
FUJIE Koichi Toyohashi University of Technology, Department of Ecological Engineering, Profes, エコロジー工学系, 教授 (30134836)
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| Research Abstract |
In recent years, soil pollution by volatile organic compounds, for example, trichroloethylene, tetrachloroethylene becomes seriously.
Firstly, for the basic data of remediation by vapor extraction from soil, the evapolation rate was analyzed by experiments of blowing clean air into the contaminated soil. The logarithmic relations between the evaporation rate and the gas flow time were represented by linear equations, and the equation's parameters were not affected by gas flow rate. Therefore, an estimate method of the change of contents in soil and the remediation time were proposed for every air flow rate and water contents. And a selection method of the best vacuum pump was clarified also.
Secondly, the adsorption capacities of chlorinated organic pollutants were studied, for the basic data of adsorption and concentration of the evaporated gas from soil. Therefore, adsorption equilibrium of single component was represented by Dubinin-Polanyi's equation, but in the real evaporated gas, the adsorted amounts of chlorinated organic compounds decreased by coexistent water vapor. And this effect was suddenly increased when humidity was above 70%. From these results, design method of the best adsorption system by activated carbon was clarified.
Thirdly, the thermal treatment method in the high temperature and the low temperature were tested, then their optimum operating conditions were clarified. Further it was confirmed that the degradation ratio was over 99%, when the evaporated chlorinated organic compounds were incinerated at over 800ﾟC.
Fourthly, informations on developing situations and problems of bio-remediation and in situ glass solidification ware collected.
From the above research, it was clarified a selection method of optimum soil remediation method by contaminated level, areas and soil volumes.
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