| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Hideki Tohoku University, Graduate School of Environmental Studies, Professor, 大学院環境科学研究科, 教授 (10396468)
IOKU Kouji Tohoku University, Graduate School of Environmental Studies, Professor, 大学院環境科学研究科, 教授 (60212726)
INOUE Chihiro Tohoku University, Graduate School of Environmental Studies, Professor, 大学院環境科学研究科, 教授 (30271878)
SHINODA Kozo Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (10311549)
山崎 仲道 東北大学, 大学院・環境科学研究科, 教授 (50036589)
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| Budget Amount *help |
¥15,000,000 (Direct Cost: ¥15,000,000)
Fiscal Year 2006: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥11,500,000 (Direct Cost: ¥11,500,000)
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| Research Abstract |
The purpose of this study is to create Passive Remediation Soil (PRS), which has a function to prevent spreading contamination with automatically by analyzing the ability of natural attenuation which is from the effect of clay minerals, metallic minerals and metals in the soil.
In a study of last year (2005), the effectiveness of using metal iron as PRS for resolving volatile organic (chlorine) compounds in the soil was confirmed. However, it shared that there was when, at the same time, the VOC (volatile organic compounds) resolution action of metal iron was remarkable and fell by quality of soil. It was thought as the cause that some ingredients of soil origin became a disincentive. We investigated the reaction with soil elution ingredient and iron powder this time.
As the result of this experiment, under a specification condition, this phenomenon was confirmed that anions ions such as Mg^<2+> or Ca^<2+>, which were soil elution ingredient, and SO_4^<2->, which was an elution ingredien
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t from iron powder or soil, were connected and formed the coat of hardly soluble compounds on the iron powder surface. The salts break off the contact of the iron powder surface and ground water. Because resolution mechanism of VOC was dechlorination by battery reaction at the iron powder surface, it was considered that the coat of hardly soluble generated on the iron powder surface obstructed the VOC resolution of iron powder. It is revealed that the specification condition happened in the marine sediment clay layer. In addition, using high concentration heavy metal solution, I performed basic adsorption examination to the soil. At the result, it was confirmed that by a difference of weathering degree, there is a difference in quantity of heavy metal adsorption to the soil. Therefore we made the soil which controlled weathering degree using hydrothermal reaction artificially. A change of quantity of heavy metal adsorption was confirmed. With the loam soil given hydrothermal reaction under the condition of volcanic glass changing into allophane, the quantity of lead adsorption from the solution which includes high concentrate lead was about 100 times larger compared with one before hydrothermal reaction enforcement. It was confirmed that the quantity of adsorption rose by artificial weathering.
From the above-mentioned findings, by having been able to get various knowledges necessary for making of PRS to relate to movement and the resolution of a pollutant in the soil, the condition setting was enabled according to a kind of factories and geographical area, which should be performed nonproliferation. Less
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