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Simultaneous removal of trivalent chromium and hexavalent chromium from soil using a modified bipolar membrane electrodialysis system.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.est.0c04105 Yaoxing Liu 1, 2 , Xiong Ke 1 , Xiaoyun Wu 1 , Chenjing Ke 1 , Riyao Chen 1 , Xiao Chen 1 , Xi Zheng 1 , Yanchao Jin 1 , Bart Van der Bruggen 2, 3
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.est.0c04105 Yaoxing Liu 1, 2 , Xiong Ke 1 , Xiaoyun Wu 1 , Chenjing Ke 1 , Riyao Chen 1 , Xiao Chen 1 , Xi Zheng 1 , Yanchao Jin 1 , Bart Van der Bruggen 2, 3
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In this study, a modified bipolar membrane electrodialysis system equipped with a “back-to-back” soil compartment was fabricated for simultaneous removal of trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)) from contaminated soils. The results showed that the soil solution pH had a significant effect on the Cr(III) and Cr(VI) desorption, and the desorption data fit well with the Elovich kinetic model. Current density had an obvious effect on Cr(III) and Cr(VI) removal, cell voltage, soil pH, current efficiency, and specific energy consumption, and the optimal current density was 2.0 mA/cm2. The removal efficiencies of Cr(III) and Cr(VI) were both 99.8%, while Cr(III) and Cr(VI) recoveries were somewhat lower at 87 and 90%, respectively, because some Cr(III) and Cr(VI) were adsorbed by the membranes. An energy consumption analysis indicates that the back-to-back soil compartment equipped system increased the current efficiency and decreased the specific energy consumption. When a system equipped with two back-to-back soil compartments was used to remove chromium from soil, the current efficiency increased to 28.8% and the specific energy consumption decreased to 0.048 kWh/g. The experimental results indicate that the proposed process has the potential to be an effective technique for the treatment of soil contaminated with heavy metals.
中文翻译：
使用改良的双极膜电渗析系统同时从土壤中去除三价铬和六价铬。
在本研究中，制造了一种配备有“背对背”土壤隔室的改良双极膜电渗析系统，用于同时从污染土壤中去除三价铬（Cr（III））和六价铬（Cr（VI））。结果表明，土壤溶液的pH值对Cr（III）和Cr（VI）的解吸有显着影响，且解吸数据与Elovich动力学模型吻合良好。电流密度对Cr（III）和Cr（VI）的去除，电池电压，土壤pH，电流效率和比能耗有明显影响，最佳电流密度为2.0 mA / cm 2。Cr（III）和Cr（VI）的去除效率均为99.8％，而Cr（III）和Cr（VI）的回收率则分别较低，分别为87％和90％，因为某些Cr（III）和Cr（VI） ）被膜吸附。能耗分析表明，配备背靠背土壤隔室的系统提高了电流效率，并降低了单位能耗。当使用配有两个背对背土壤隔室的系统去除土壤中的铬时，电流效率提高到28.8％，比能耗降低到0.048 kWh / g。实验结果表明，所提出的方法有可能成为处理重金属污染土壤的有效技术。
更新日期：2020-10-21
中文翻译：
使用改良的双极膜电渗析系统同时从土壤中去除三价铬和六价铬。
在本研究中，制造了一种配备有“背对背”土壤隔室的改良双极膜电渗析系统，用于同时从污染土壤中去除三价铬（Cr（III））和六价铬（Cr（VI））。结果表明，土壤溶液的pH值对Cr（III）和Cr（VI）的解吸有显着影响，且解吸数据与Elovich动力学模型吻合良好。电流密度对Cr（III）和Cr（VI）的去除，电池电压，土壤pH，电流效率和比能耗有明显影响，最佳电流密度为2.0 mA / cm 2。Cr（III）和Cr（VI）的去除效率均为99.8％，而Cr（III）和Cr（VI）的回收率则分别较低，分别为87％和90％，因为某些Cr（III）和Cr（VI） ）被膜吸附。能耗分析表明，配备背靠背土壤隔室的系统提高了电流效率，并降低了单位能耗。当使用配有两个背对背土壤隔室的系统去除土壤中的铬时，电流效率提高到28.8％，比能耗降低到0.048 kWh / g。实验结果表明，所提出的方法有可能成为处理重金属污染土壤的有效技术。
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