| 講演要旨(和文) | | 土壌汚染や地下水汚染を防止する方策の一つして, PRB工法や吸着層工法などが実施されており, 浄化効果の確認には, 観測井戸における水質調査の結果が用いられることが多い. しかし観測井戸を設置するには費用がかかり, 井戸だけでは広範囲に吸着層の効果を知ることは難しい. そこで吸着層の効果を検討するために比抵抗モニタリングの適用を考えた. 比抵抗の変化を用いることで, 非破壊で簡便に地下の性状変化を把握することが可能と考えられ, さらに浄化層の効果まで知ることができる. 結果としては活性炭を吸着層として用いた場合は, 比抵抗値から吸着状況を評価することは可能である. 一方,ゼオライト吸着層を用いた場合, カラムの比抵抗と流出溶液の電気伝導度から吸着を判断することは難しい. これは, ゼオライトからNa+が多量に溶出するためであり, 吸着の効果を判断する障害となるからである. |
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| | 講演要旨(英文) | | In Japan, problems of soil contamination and groundwater pollution are occurring due to leakage of harmful substances from factories and drainage facilities into the soil and leakage of leachate from the repository. In order to prevent the diffusion of these contaminations, PRB method and adsorption layer construction method are being implemented. A water quality survey using the observation wells are carried out to confirm the effect of these methods. However, observation wells are not suitable for monitoring over a wide area and the installation costs are expensive. Therefore, we conducted basic research to detect the effect of adsorption layer easily and widely using resistivity monitoring. For that purpose, the experimental column simulating the purification layer was prepared and the relationship between the heavy metal adsorption and the change in resistivity was investigated. As a result, the adsorption of the heavy metal, such as Cd, affects the change of resistivity of the column with activated carbon in Cd solution flow experiment. |
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