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Effect of different soil layers on porewater to remediate acidic surface environment at a close mine site

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Title: Effect of different soil layers on porewater to remediate acidic surface environment at a close mine site
Authors: Villafane, Omar R. Salinas Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Harada, Shusaku Browse this author →KAKEN DB
Kurosawa, Mitsuru Browse this author
Takase, Toshio Browse this author
Keywords: Porewater
In situ monitoring
Soil layers
Heavy metals
Closed mine
Issue Date: Dec-2012
Publisher: Springer Netherlands
Journal Title: Environmental Monitoring and Assessment
Volume: 184
Issue: 12
Start Page: 7665
End Page: 7675
Publisher DOI: 10.1007/s10661-012-2526-z
PMID: 22350344
Abstract: This paper describes the chemistry of porewater when constructing different soil layers on acidic weathered rock of a closed mine to remediate the surface environment. Three cases were set on a flat surface of the site, all under different layer systems. Case 1 was only composed of weathered rocks. A top neutralization layer was constructed on the weathered rocks in case 2, whereas both an upper low permeable and middle neutralization layers were constructed on the weathered rocks in case 3. The low permeable layer of 30 cm thick consists of clay, and the neutralization layer of 30 cm thick consists of the mixture of the weathered rock and calcium carbonate as a neutralizer. Porewater sampling systems and soil sensors to measure temperature, water content, and electrical conductivity were set at different depths. In case 1, steadily high concentrations of heavy metals were observed regardless of the depth, and the pH ranged from 2 to 4. In cases 2 and 3, a dramatic decrease in concentrations of heavy metals was observed, even below the neutralization layer. For both cases, pH values were circumneutral. There were no significant seasonable changes in heavy metals concentrations and pH of porewater by considering the temperature and precipitation. In addition, the water content of the layers in case 3 fluctuated more mildly than that in cases 1 and 2, indicating that the low permeable layer reduced the rate of infiltration. Therefore, a significant reduction in the load of heavy metals released from the site can be achieved by both implementing neutralization and low permeable layers.
Rights: The final publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/50931
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Omar Roberto Salinas Villafane

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