Extraction of heavy metals from e-waste contaminated soils using EDDS

被引：25
|
作者：
Yang, Renxiu [1 ]
Luo, Chunling [2 ,3 ]
Zhang, Gan [2 ]
Li, Xiangdong [3 ]
Shen, Zhenguo [1 ]
机构：
[1] Nanjing Agr Univ, Coll Life Sci, Nanjing 210095, Jiangsu, Peoples R China
[2] Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
[3] Hong Kong Polytech Univ, Dept Civil & Struct Engn, Kowloon, Hong Kong, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2012年 / 24卷 / 11期
基金：
中国国家自然科学基金;
关键词：
e-waste; soil washing; biodegradable chelant; heavy metal; EDDS; ENHANCED PHYTOEXTRACTION; KINETIC INTERACTIONS; ION BINDING; CHELATE; AREA; EDTA; LEAD; CU; BIODEGRADATION; MOBILIZATION;
D O I：
10.1016/S1001-0742(11)61036-X
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Environmental contamination due to uncontrolled e-waste recycling activities is drawing increasing attention in the world. Extraction of these metals with biodegradable chelant [S,S]-ethylenediaminedisuccinic acid (EDDS) and the factors influencing extraction efficacy were investigated in the present study. Results showed that the addition of EDDS at low pH (5.5) produced higher metal extraction than that at high pH (8.0) solution. Metal speciation analysis indicated that Cu was completely complexed with EDDS at different pH conditions with various amounts of EDDS applied. For Pb and Zn, at low EDDS dose of 0.304 mol/kg soil, they were present as Pb- and Zn-EDDS. However, at high EDDS dose of 1.26 mol/kg soil, most of Pb was bound with dissolved organic matter. Ca and Al were found to be strong competitors for trace metals to EDDS at low application dose and low pH condition.
引用
收藏
页码：1985 / 1994
页数：10
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