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| 生物炭对Cd污染土壤的修复效果与机理 | |
| 引用本文： | 陈昱, 钱云, 梁媛, 施维林. 生物炭对Cd污染土壤的修复效果与机理[J]. 环境工程学报, 2017, 11(4): 2528-2534. doi: 10.12030/j.cjee.201510234 |
| 作者姓名： | 陈昱 钱云 梁媛 施维林 |
| 作者单位： | 1.苏州科技学院环境科学与工程学院, 苏州 215011 |
| 基金项目： | 国家自然科学基金资助项目（31570515， 21507097） 江苏省自然科学基金资助项目（BK20150288） 江苏省高校自然科学研究项目（14KJD610003） 苏州市科技发展支撑计划（SS201421， SS201521） |
| 摘 要： | 通过修复培养实验和BCR连续提取实验研究牛粪生物炭（DM）和水稻秸秆生物炭（RS）对2种镉污染土壤的修复效果、影响因素及修复后的Cd的形态分布，探讨可能存在的修复机理。经56 d修复后，与CK相比，5%添加量的牛粪生物炭（DM5%）和水稻秸秆生物炭（RS5%）使TCLP提取态Cd在S1土壤中分别降低了15%和18%，在S2土壤中分别降低了5%和6%。但生物炭添加量为1%时对S2土壤中Cd无显著修复效果。DM5%和RS5%处理使Cd的酸可溶态在S1土壤中降低8.66%和9.25%，在S2土壤中降低7.86%和13.4%，相应的残渣态在S1土壤中升高8.30%和10.54%，在S2土壤中升高8.67%和14.92%。同时，DM5%和RS5%处理使土壤pH提高了7.69%~13.13%，TCLP提取态P增高了0.046~0.39 mg·g-1。结果表明，添加量为5%的牛粪生物炭和秸秆生物炭可有效修复Cd污染土壤。 |
| 关 键 词： | 镉 污染土壤 生物炭 修复 Cd形态 |
| 收稿时间： | 2015-12-31 |
Immobilization and its mechanisms of cadmium contaminated soils by biochar |
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| CHEN Yu, QIAN Yun, LIANG Yuan, SHI Weilin. Immobilization and its mechanisms of cadmium contaminated soils by biochar[J]. Chinese Journal of Environmental Engineering, 2017, 11(4): 2528-2534. doi: 10.12030/j.cjee.201510234 | |
| Authors: | CHEN Yu QIAN Yun LIANG Yuan SHI Weilin |
| Affiliation: | 1.School of Enviromental Science and Engineering, SuZhou University of Science and Technology, Suzhou 215011, China |
| Abstract: | The main objective of this study was to evaluate the remediation efficiency, impact factors, speciation changes, and immobilization mechanism of Cd in two contaminated soils (S1 and S2) amended by dairy cattle manure-derived biochar (DM) and rice straw-derived biochar (RS) at different ratios through an incubation experiment and a BCR continuous extraction experiment. After 56 days of incubation, the contaminated soils incorporated with DM5% and RS5% could decrease Cd mobility. Compared with CK, the reduction in Cd leachability with DM5% and RS5% treatment in the toxicity characteristic leaching procedure (TCLP) extract was 15% and 18% in S1 soil, and 5% and 6% in S2 soil, respectively. However, the biochar treatments with the 1% addition did not clearly affect Cd immobilization in S2 soil. Compared with CK, both DM5% and RS5% treatments decreased the acid-soluble Cd, with reductions of 8.66% and 9.25% in S1 soil, as well as reductions of 7.86% and 13.4% in S2 soil, respectively. At the same time, the DM5% and RS5% treatments improved the residual Cd, with an increase to 8.30% and 10.54% in S1 soil, respectively, as well as an increase to 8.67% and 14.92% in S2 soil, respectively. The pH and P obviously increased by RS5% and DM5% treatments in the TCLP extraction, with an improvement of 7.69% to 13.13% for pH and 0.046 to 0.39 mg·g-1 for P. The results indicated that contaminated soils with a 5% (w/w) biochar addition could clearly immobilize Cd. |
| Keywords: | Cadmium contaminated soil biochar remediation the changes of Cadmium speciation |
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