| 生物淋滤联合类Fenton反应去除污染土壤中重金属的效果 |
| 摘要点击 1708 全文点击 728 投稿时间：2016-03-17 修订日期：2016-04-10 |
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| 中文关键词 生物淋滤 类Fenton反应 污染土壤 重金属 去除效率 |
| 英文关键词 bioleaching Fenton-like reaction contaminated soil heavy metals removal efficiency |
| 作者 | 单位 | E-mail | | 周普雄 | 福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002 | puxiongzhou@foxmail.com | | 严勰 | 福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002 | | | 余震 | 广东省生态环境与土壤研究所, 广东省农业环境综合治理重点实验室, 广州 510650 | yuzhen@soil.gd.cn | | 王跃强 | 广东省生态环境与土壤研究所, 广东省农业环境综合治理重点实验室, 广州 510650 | | | 朱艺 | 湖北理工学院环境科学与工程学院, 黄石 435003 | | | 周顺桂 | 福建农林大学资源与环境学院, 福建省土壤环境健康与调控重点实验室, 福州 350002 | |
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| 中文摘要 |
| 针对我国南方地区广泛存在的土壤重金属污染问题，以广东韶关铅锌矿周边污染农田土壤为研究对象，探讨利用生物淋滤方法与生物淋滤联合类Fenton反应对土壤Cu、Zn、Cd和Pb的去除效果，并采用序列化学提取（SEC）方法，分析不同处理对土壤中4种重金属形态分布的影响.结果表明，经12 d生物淋滤Cu、Zn、Cd和Pb的去除率分别达到66.5%、55.1%、72.8%和35.6%，其中无机结合态重金属去除效果最好，固相中剩余重金属主要以稳定的残渣态形式存在.2 d生物淋滤联合类Fenton反应在优化的H2O2浓度（5 g·L-1）下，对上述4种重金属的去除率分别为55.6%、50.6%、60.7%和30.5%，低于12 d生物淋滤处理，但显著高于H2SO4酸化、2 d生物淋滤、化学Fenton反应等对照处理.生物淋滤联合类Fenton反应可以实现原土壤中残渣态、有机结合态和无机结合态等较稳定态重金属的有效去除，使处理后土壤中4种重金属Cu、Zn、Cd和Pb的含量分别低于50、200、0.3和250 mg·kg-1的标准限值.该方法兼具生物淋滤高去除效率和Fenton反应快速处理等优势，对于修复重金属Cu、Zn、Cd和Pb等复合污染的土壤具应用前景. |
| 英文摘要 |
| Considering that heavy metal pollution problem is widespread in the soil of South China, bioleaching process and bioleaching combined with Fenton-like reaction were used to study the removal performance of Cu, Zn, Cd and Pb in the contaminated soil around the lead-zinc mine in ShaoGuan City, Guangdong Province, China. Sequential chemical extraction was applied to analyze the effects of different treatments on the fracion distributions of Cu, Zn, Cd and Pb. The results showed that 66.5% of copper,55.1% of zinc, 72.8% of cadmium and 35.6% of lead could be removed after 12-day bioleaching process, among which, the inorganic bound-fracion had the best dissolution efficiency. The rest of the heavy metals in solid phase mainly existed in the form of stabilized residual fraction. With an optimal H2O2 concentration of 5 g·L-1, the removal efficiencies of Cu, Zn, Cd and Pb were 55.6%, 50.6%, 60.7% and 30.5% respectively after 2-day bioleaching combined with Fenton-like reaction, which indicated that this treatment was less effective than 12-day bioleaching, but significantly more effective than the H2SO4 leaching, 2-day bioleaching, and Fenton reaction. The bioleaching combined with Fenton-like reaction could realize the effective dissolution of stable-state heavy metals such as residual fraction, organic bound fraction and inorganic bound fraction in the soil, the contents of Cu, Zn, Cd and Pb were below the limit value of standand of 50, 200, 0.3 and 250 mg·kg-1 after the treatment, respectively. It possesses the advantage of high removal efficiency in bioleaching and rapid reaction rate in Fenton reaction, thus, it is a promising remediation treatment for heavy metal contaminated soil. |
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