Development of Advanced In-situ Soil Remediation Method

先进土壤原位修复方法的开发

• 批准号: 15360475
• 负责人: NIINAE Masakazu
• 金额: $ 7.81万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360475/
• 关键词: Electrokunetics; Contaminated soils; Remediation; Heavy metals; Acidification of soils; Unsaturated soils; 汚染土壌; 原位置; 界面動電現象; カドミウム; 六価クロム; 数値解析

Electrokinetic soil remediation by electroosmosis and ionic migration is restricted to soluble substances. At a higher pH, the soil particles sorb more heavy metals, such as cadmium, than at a lower pH and the precipitation reactions of heavy metals are promoted. Both mechanisms make heavy metals immobile, rendering cleanup more difficult and electrokinetic extraction inefficient. Therefore, the acidification of soils is very important to increase the cleanup efficiencies of heavy metals, such as cadmium by electrokinetic method from contaminated soils. Meanwhile, hexavalent chromium is more mobile and easily soluble. Hexavalent chromium has high solubility in water and exists as chromate, monochromate or dichromate anions depending on the pH of the solutions. This hexavalent chromium is the chemical form requiring remediation. And then, hydrogen and cadmium ions transport in unsaturated soils are predicted with a simple numerical method in which electrical flow is coupled with hydraul … More ic flow, and the treatment for unsaturated soils are investigated. In this study, cadmium and hexavalent chromium transport are predicted with a simple numerical method in which electrical flow is coupled with hydraulic flow, and the sorption process in the soils is induced in the model. The results obtained this study are summarized as follows :The two-dimensional electrode configurations containing cathode surrounded by three or more anodes rapidly remove cadmium from soils compared with one-dimensional electrode configuration. Meanwhile, in the removal of hexavalent chromium from soils, the two-dimensional electrode configurations containing anode surrounded by three or more cathodes can be effectively utilized compared with one-dimensional electrode configuration. A larger electrode spacing increases the processing time required, and it was also found that a larger electric field strength reduced the processing time required. Hydrogen and cadmium ions move downward in unsaturated soils, particularly, move significantly downward against upper layer, sandy/clay, and lower layer, clayey/silty soils. However, remediation is applied successfully to unsaturated soils by coupled electric-hydraulic gradient. Less

电渗透和离子迁移的土壤电动力学修复仅限于可溶物质。在较高的pH值下，土壤颗粒比在较低的pH值下吸收更多的重金属，如镉，并促进重金属的沉淀反应。这两种机制都使重金属无法移动，使清理变得更加困难，电动提取效率低下。因此，土壤酸化对提高土壤中镉等重金属的电动净化效率具有重要意义。同时，六价铬更具流动性和易溶性。六价铬在水中具有高溶解度，根据溶液的pH值以铬酸盐、单铬酸盐或重铬酸盐阴离子的形式存在。这种六价铬是需要修复的化学形式。在此基础上，采用电-水耦合的简单数值方法预测了非饱和土中氢、镉离子的输运，并对非饱和土的处理进行了研究。本文采用电-水力耦合的简单数值方法预测了镉和六价铬在土壤中的运移，并模拟了镉和六价铬在土壤中的吸附过程。本研究的结果总结如下：与一维电极结构相比，含有三个或更多阳极的阴极的二维电极结构可以快速去除土壤中的镉。同时，在土壤中六价铬的去除中，与一维电极结构相比，含有三个或更多阴极的阳极的二维电极结构可以有效地利用。较大的电极间距增加了所需的加工时间，并且还发现较大的电场强度减少了所需的加工时间。氢和镉离子在非饱和土壤中向下移动，特别是在上层砂质/粘土和下层粘土/粉质土壤中显著向下移动。然而，采用电-液耦合梯度法修复非饱和土已取得成功。少

项目成果

重金属汚染土壌の動電学的浄化に関する実験的検討

重金属污染土壤动电修复实验研究

• 发表时间: 2004
• 期刊: 地下水・土壌汚染とその防止対策に関する研究集会第10回講演集
• 作者: Masakazu Niinae;新苗 正和;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;新苗正和;新苗正和;新苗正和;新苗 正和;Masakazu Niinae;新苗正和;新苗 正和;新苗 正和;青木謙治;Masakazu Niinae;Kenji Aoki;新苗 正和;新苗 正和
• 通讯作者: 新苗 正和

Numerical Modeling for Electrokinetic Soil Processing -Acidification of Soil-

电动土壤处理的数值模拟-土壤酸化-

• 发表时间: 2009
• 作者: 加藤政利、中村裕一;他4名;Yasumasa TOJO;中村裕一;新苗正和
• 通讯作者: 新苗正和

動電学的土壌浄化法による重金属の浄化効率に及ぼす電極配列の影響

电极布置对动电土壤修复法重金属净化效率的影响

• 发表时间: 2006
• 期刊: 環境資源工学 53巻・2号(印刷中)
• 作者: Masakazu Niinae;新苗 正和
• 通讯作者: 新苗 正和

Electrokinetic Remediation of Contaminated Soils

污染土壤的动电修复

• 发表时间: 2003
• 期刊: Journal of the Mining and Materials Processing Institute of Japan Vol.119, No.4,5
• 作者: Masakazu Niinae;新苗 正和;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;新苗正和;新苗正和;新苗正和;新苗 正和;Masakazu Niinae;新苗正和;新苗 正和;新苗 正和;青木謙治;Masakazu Niinae;Kenji Aoki;新苗 正和;新苗 正和;新苗 正和;新苗 正和;Masakazu Niinae;Masakazu Niinae
• 通讯作者: Masakazu Niinae

Effect of Electrode Configuration on Cleanup Efficiency of Heavy Metals by Electrokinetic Soil Remediation

电极配置对动电土壤修复重金属净化效率的影响

• 发表时间: 2006
• 期刊: Resources Processing Vol.53, No.2 (in press)
• 作者: Masakazu Niinae;新苗 正和;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae;Masakazu Niinae
• 通讯作者: Masakazu Niinae