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Evaluation of Calcium Polysulfide as a Reducing Agent for the Restoration of a Cr(VI)-Contaminated Aquifer.
Bulletin of Environmental Contamination and Toxicology ( IF 2.7 ) Pub Date : 2020-05-27 , DOI: 10.1007/s00128-020-02890-1
T Mpouras 1 , N Papassiopi 2 , K Lagkouvardos 1 , C Mystrioti 2 , D Dermatas 1
Affiliation  

This study aims at investigating the efficiency of calcium polysulfide (CPS) as a reducing agent for decontamination of a heavily Cr(VI)-contaminated aquifer. Batch experiments were carried out in order to evaluate the effect of time, CPS concentration and the presence of soil on the reductive behavior of CPS. CPS was used at several stoichiometric excesses with respect to Cr(VI) concentration detected in the contaminated groundwater. In addition, the effect of CPS on other groundwater constituents like nitrates, and potential mobilization of soil elements were also evaluated. Finally, column tests were carried out in order to evaluate the efficiency of CPS for the Cr(VI) reduction in flow conditions. The results showed that CPS can be an effective reducing agent for the remediation of the Cr(VI) contaminated aquifer especially at pump and treat methods. The required minimum dose of CPS for reducing Cr(VI) from the initial level of 1000 μg/L below the environmental limit of 50 μg/L was found equivalent to approximately 2.8 mg/L of sulfide anions. Moreover CPS use did not significantly affect soil properties and mobilization of soil elements.

中文翻译:

评价多硫化钙作为还原剂以修复受Cr(VI)污染的含水层。

这项研究旨在调查多硫化钙(CPS)作为还原剂对重度受Cr(VI)污染的含水层进行去污染的效率。为了评估时间,CPS浓度和土壤的存在对CPS还原行为的影响,进行了批处理实验。相对于在受污染的地下水中检测到的Cr(VI)浓度,CPS的化学计量过量。此外,还评估了CPS对其他地下水成分(如硝酸盐)的影响以及土壤元素的潜在动员。最后,进行柱测试以评估CPS降低流动条件下Cr(VI)的效率。结果表明,CPS可以作为一种有效的还原剂,用于修复受Cr(VI)污染的含水层,尤其是在泵送和处理方法中。发现将Cr(VI)从最初的1000μg/ L水平降低到低于环境极限50μg/ L所需的最低CPS剂量约等于2.8 mg / L硫化物阴离子。此外,使用CPS不会显着影响土壤性质和土壤元素的动员。
更新日期:2020-05-27
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