| 核桃壳生物炭对土壤中镉的钝化修复 |
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| 引用本文： | 鲁秀国,武今巾,郑宇佳.核桃壳生物炭对土壤中镉的钝化修复[J].环境工程,2020,38(11):196-202. |
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| 作者姓名： | 鲁秀国 武今巾 郑宇佳 |
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| 作者单位： | 华东交通大学 土木建筑学院, 南昌 330013 |
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| 摘 要： | 通过室内模拟试验，研究了核桃壳生物炭（BC400、BC500、BC600）对人工Cd污染土壤（20 mg/kg）pH、Cd赋存形态分布的影响，并探究可能的修复机理。结果显示:经56 d修复后，与空白对照组相比，10%添加量的核桃壳生物炭BC400、BC500、BC600分别使土壤pH升高了1.07、1.31、1.38，弱酸可提取态Cd含量减少了17.02%、20.20%、24.53%，可还原态Cd含量减少了8.9%、19.1%、38.2%，可氧化态Cd含量增加了44.83%、78.45%、100%，残渣态Cd含量增加了66.03%、71.43%、89.21%。同时，土壤pH与土壤中弱酸可提取态Cd含量呈显著负相关（P<0.01）。综上，核桃壳生物炭能够对Cd污染土壤起到钝化修复作用。
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| 关 键 词： | 核桃壳生物炭 土壤重金属 镉 修复 |
| 收稿时间： | 2019-09-05 |
PASSIVATION OF CADMIUM IN SOIL BY WALNUT SHELL BIOCHAR |
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| LU Xiu-guo,WU Jin-jin,ZHENG Yu-jia.PASSIVATION OF CADMIUM IN SOIL BY WALNUT SHELL BIOCHAR[J].Environmental Engineering,2020,38(11):196-202. |
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| Authors: | LU Xiu-guo WU Jin-jin ZHENG Yu-jia |
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| Affiliation: | School of Civil Engineering and Architecture, East China Jiao Tong University, Nanchang 330013, China |
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| Abstract: | The effects of walnut shell biochar (BC400, BC500, BC600) on pH and Cd morphology distribution in artificial Cd-contaminated soil (20 mg/kg) were studied through laboratory simulation experiments, and possible repair mechanisms were investigated. The results showed that after 56 days of remediation, compared with the blank control group, with 10% dosage of walnut shell biochar BC400, BC500 and BC600, the soil pH increased by 1.07, 1.31 and 1.38, the content of extractable Cd decreased by 17.02%, 20.20% and 24.53%, the reducible Cd content decreased by 8.9%, 19.1% and 38.2%, the oxidizable Cd content increased by 44.83%, 78.45% and 100%, and the residual Cd content increased by 66.03%, 71.43%, 89.21%. At the same time, there was a significant negative correlation between soil pH and soil extractable Cd content (P<0.01). Walnut shell biochar was proved to have the performance in passivating and repairing Cd-contaminated soil. |
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