School of Civil Engineering, Sichuan University of Science and Engineering, Zigong, 643000, China.
School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, 610031, China.
Environ Pollut. 2021 Mar 1;272:115975. doi: 10.1016/j.envpol.2020.115975. Epub 2020 Nov 2.
In this work, the novel technology was used to remove heavy metal from sludge. The coupled with biodegradable ethylenediamine disuccinic acid (EDDS) and approaching anode electrokinetic (AA-EK) technique was used to enhance heavy metal removing from sludge. Electric current, sludge and electrolyte characteristics, heavy metal removal efficiency and residual content distribution, and heavy metal fractions percentage of variation were evaluated during the electrokinetic remediation process. Results demonstrated that the coupled with EDDS and AA-EK technique obtain a predominant heavy metal removal efficiency, and promote electric current increasing during the enhanced electrokinetic remediation process. The catholyte electrical conductivity was higher than the anolyte, and electrical conductivity of near the cathode sludge achieved a higher value than anode sludge during the coupled with EDDS and AA-EK remediation process. AA-EK technique can produce a great number of H, which caused the sludge acidification and pH decrease. Cu, Zn, Cr, Pb, Ni and Mn obtain the highest extraction efficiency after the coupled with EDDS and AA-EK remediation, which were 52.2 ± 2.57%, 56.8 ± 3.62%, 60.4 ± 3.62%, 47.2 ± 2.35%, 53.0 ± 3.48%, 54.2 ± 3.43%, respectively. Also, heavy metal fractions analysis demonstrated that the oxidizable fraction percentage decreased slowly after the coupled with EDDS and AA-EK remediation.
在这项工作中，采用了一种新颖的技术从污泥中去除重金属。采用可生物降解的乙二胺二琥珀酸（EDDS）与接近阳极电动（AA-EK）技术相结合，以提高污泥中重金属的去除效率。评估了电动修复过程中的电流、污泥和电解质特性、重金属去除效率和残留含量分布以及重金属形态百分比的变化。结果表明，EDDS 与 AA-EK 技术相结合可获得较高的重金属去除效率，并在增强电动修复过程中促进电流的增加。阴极电解液的电导率高于阳极电解液，在 EDDS 与 AA-EK 修复过程中，阴极附近的污泥电导率高于阳极污泥。AA-EK 技术可产生大量 H+，导致污泥酸化和 pH 值下降。Cu、Zn、Cr、Pb、Ni 和 Mn 在经过 EDDS 与 AA-EK 修复后，提取效率最高，分别为 52.2±2.57%、56.8±3.62%、60.4±3.62%、47.2±2.35%、53.0±3.48%、54.2±3.43%。此外，重金属形态分析表明，经过 EDDS 与 AA-EK 修复后，可氧化形态的比例缓慢下降。
