| 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 |
| 摘要点击 2436 全文点击 1492 投稿时间：2014-11-05 修订日期：2014-12-17 |
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| 中文关键词 污泥 生物可降解螯合剂 GLDA 重金属污染 污泥资源化 |
| 英文关键词 sludge biodegradable chelating agent GLDA heavy metal pollution sludge resources |
| 作者 | 单位 | E-mail | | 吴青 | 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 | wuqingkuaile@hotmail.com | | 崔延瑞 | 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 | | | 汤晓晓 | 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 | | | 杨慧娟 | 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 | | | 孙剑辉 | 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 | sunjh@htu.cn;sunjhhj@163.com |
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| 中文摘要 |
| 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 pH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 pH=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 pH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. |
| 英文摘要 |
| 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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