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首页> 外文期刊>Environmental Technology >Citric-acid preacidification enhanced electrokinetic remediation for removal of chromium from chromium-residue-contaminated soil
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Citric-acid preacidification enhanced electrokinetic remediation for removal of chromium from chromium-residue-contaminated soil

机译：柠檬酸预酸化增强电动修复以从铬渣污染的土壤中去除铬

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摘要

Electrokinetic experiments were conducted on chromium-residue-contaminated soils collected from a chemical plant in China. Acidification-electrokinetic remediation technology was proposed in order to solve the problem of removing inefficient with ordinary electrokinetic. The results showed that electrokinetic remediation removal efficiency of chromium from chromium-contaminated soil was significantly enhanced with acidizing pretreatment. The total chromium [Cr(T)] and hexavalent chromium [Cr(VI)] removal rate of the group acidized by citric acid (0.9 mol/L) for 5 days was increased from 6.23% and 19.01% in the acid-free experiments to 26.97% and 77.66% in the acidification-treated experiments, respectively. In addition, part of chromium with the state of carbonate-combined will be converted into water-soluble state through acidification to improve the removal efficiency. Within the appropriate concentration range, the higher concentration of acid was, the more chromium was released. So the removal efficiency of chromium depended on the acid concentration. The citric acid is also a kind of complexing agent, which produced complexation with Cr that was released by the electrokinetic treatment and then enhanced the removal efficiency. The major speciation of chromium that was removed from soils by acidification-electrokinetics remediation was acid-soluble speciation, revivification speciation and oxidation speciation, which reduced biological availability of chromium.
机译：在从中国一家化工厂收集的铬残渣污染的土壤上进行了电动实验。提出了酸化-电动修复技术，以解决普通电动去除效率低的问题。结果表明，酸化预处理可显着提高动电修复铬污染土壤中铬的去除效率。在无酸实验中，柠檬酸（0.9 mol / L）酸化5天的基团的总铬[Cr（T）]和六价铬[Cr（VI）]去除率从6.23％和19.01％提高在酸化处理的实验中分别增至26.97％和77.66％。另外，一部分铬与碳酸盐结合的状态会通过酸化转化为水溶性，从而提高去除效率。在适当的浓度范围内，酸的浓度越高，铬的释放越多。因此，铬的去除效率取决于酸浓度。柠檬酸也是一种络合剂，它通过电动处理释放出与Cr的络合物，从而提高了去除效率。通过酸化-电动修复从土壤中去除的铬的主要形态为酸溶性形态，复活形态和氧化形态，这降低了铬的生物利用度。

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