| 生物可降解螯合剂谷氨酸 N,N -二乙酸四钠对污泥中重金属萃取效率的研究 |
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| 引用本文： | 吴青,崔延瑞,汤晓晓,杨慧娟,孙剑辉.生物可降解螯合剂谷氨酸 N,N -二乙酸四钠对污泥中重金属萃取效率的研究[J].环境科学,2015,36(5):1733-1738. |
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| 作者姓名： | 吴青 崔延瑞 汤晓晓 杨慧娟 孙剑辉 |
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| 作者单位： | 河南师范大学环境学院，黄淮水环境与污染防治教育部重点实验室，河南省环境污染控制重点实验室，新乡 453007 |
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| 基金项目： | 河南省科技创新人才计划项目(134200510014); 河南省重点科技攻关项目(142102310275); 河南师范大学研究生科研创新项目(YL201426) |
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| 摘 要： | 谷氨酸N,N-二乙酸四钠(GLDA)具有较强金属螯合能力,是新一代生物可降解绿色螯合剂.通过分批提取实验对GLDA去除工业污泥中Cd、Ni、Cu、Zn的萃取过程进行研究,考察了萃取时间、萃取体系p H值、螯合剂用量等因素对重金属萃取效果的影响,并采用修正的BCR连续提取法分析萃取前后污泥中重金属的形态.结果表明,GLDA对污泥中Cd具有良好的去除效果;体系在p H=4,螯合剂与重金属总量摩尔比为3∶1的条件下,多种重金属取得最佳萃取效果;Zn主要以残渣态存在,导致该金属萃取率低;螯合能力不仅与萃取时间,萃取体系p H值,螯合剂用量,螯合常数等因素有关,而且还与金属的形态分布有关.
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| 关 键 词： | 污泥 生物可降解螯合剂 GLDA 重金属污染 污泥资源化 |
| 收稿时间： | 2014/11/5 0:00:00 |
| 修稿时间： | 2014/12/17 0:00:00 |
Extraction of Heavy Metals from Sludge Using Biodegradable Chelating Agent N,N-bis(carboxymethyl) Glutamic Acid Tetrasodium |
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| WU Qing,CUI Yan-rui,TANG Xiao-xiao,YANG Hui-juan and SUN Jian-hui.Extraction of Heavy Metals from Sludge Using Biodegradable Chelating Agent N,N-bis(carboxymethyl) Glutamic Acid Tetrasodium[J].Chinese Journal of Environmental Science,2015,36(5):1733-1738. |
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| Authors: | WU Qing CUI Yan-rui TANG Xiao-xiao YANG Hui-juan and SUN Jian-hui |
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| Institution: | Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China;Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China;Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China;Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China;Key Laboratory for Yellow River and Huai River Water Environmental and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China |
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| Abstract: | N, N-bis(carboxymethyl) glutamic acid tetrasodium (GLDA), a novel biodegradable and green chelating agent, has excellent metal chelating ability. Batch experiment was conducted to study the extraction process of Cd, Ni, Cu and Zn in industrial sludge using GLDA. The effects of contact time, pH of the system, content of chelating agent were investigated, and the forms of heavy metals in sludge pre- and post-extraction using the modified BCR sequential extraction procedure were studied. The results showed that GLDA was effective for cadmium extraction in sludge. Several heavy metals could be effectively extracted under the condition of pH 4 and molar ratio of chelating agent to total heavy metal 3:1. Residual fraction took the largest fraction in Zn, which caused the low extraction efficiency of this metal. Chelating properties were related not only to contact time, pH, chelating agent's concentration, and stability constant but also to species distribution of metals. |
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| Keywords: | sludge biodegradable chelating agent GLDA heavy metal pollution sludge resources |
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