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电絮凝同步去除水中铜(Ⅱ)和铬(Ⅵ)复合污染物的影响因素及其作用机理

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郝雅荣, 吕建波, 高雪, 孙力平, 陈茜敏, 张劲. 电絮凝同步去除水中铜(Ⅱ)和铬(Ⅵ)复合污染物的影响因素及其作用机理[J]. 环境工程学报, 2018, 12(2): 460-467. doi: 10.12030/j.cjee.201708076
引用本文: 郝雅荣, 吕建波, 高雪, 孙力平, 陈茜敏, 张劲. 电絮凝同步去除水中铜(Ⅱ)和铬(Ⅵ)复合污染物的影响因素及其作用机理[J]. 环境工程学报, 2018, 12(2): 460-467. doi: 10.12030/j.cjee.201708076
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HAO Yarong, LYU Jianbo, GAO Xue, SUN Liping, CHEN Ximin, ZHANG Jin. Influencing factors and mechanisms of simultaneous removal of copper(Ⅱ) and chromium(Ⅵ) from aqueous solutions by electrocoagulation[J]. Chinese Journal of Environmental Engineering, 2018, 12(2): 460-467. doi: 10.12030/j.cjee.201708076
Citation: HAO Yarong, LYU Jianbo, GAO Xue, SUN Liping, CHEN Ximin, ZHANG Jin. Influencing factors and mechanisms of simultaneous removal of copper(Ⅱ) and chromium(Ⅵ) from aqueous solutions by electrocoagulation[J]. Chinese Journal of Environmental Engineering, 2018, 12(2): 460-467. doi: 10.12030/j.cjee.201708076
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电絮凝同步去除水中铜(Ⅱ)和铬(Ⅵ)复合污染物的影响因素及其作用机理

  • 1.

    天津城建大学环境与市政工程学院,天津300384

  • 2.

    天津市水质科学与技术重点实验室,天津300384

  • 3.

    烟台大学土木工程学院,烟台264005

  • 基金项目:

    国家自然科学基金资助项目(51478292)

    天津市水质科学与技术重点实验室开放基金资助项目(TJKLAST-PT-2016-05)

Influencing factors and mechanisms of simultaneous removal of copper(Ⅱ) and chromium(Ⅵ) from aqueous solutions by electrocoagulation

  • 1.

    School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384,China

  • 2.

    Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384,China

  • 3.

    School of Civil Engineering, Yantai University, Yantai 264005,China

  • Fund Project:

  • 摘要: 铜(Cu(Ⅱ))和铬(Cr(Ⅵ))是水和废水中一类重要的重金属复合污染物。电絮凝(electrocoagulation, EC)是目前很有效的重金属深度处理技术,因此,采用电絮凝静态反应器对水中Cu(Ⅱ)和Cr(Ⅵ) 的复合污染物的同步去除进行研究。在单极式连接条件下,考察电极材料、电流密度、初始pH、极板间距和电导率等因素对电絮凝效果的影响。结果表明,与铁电极相比,铝电极显示出更好的Cu(Ⅱ)和Cr(Ⅵ)同步去除效果。因此,采用铝电极进行因素筛选实验,筛选出的实验条件为:Cu(Ⅱ)的进水浓度为18.73~20.08 mg·L-1,Cr(Ⅵ)的进水浓度为12.98~14.35 mg·L-1,在初始pH为3~6,电流密度为11.57 A·m-2,极板间距为1 cm,电导率在899~2 000 μS·cm-1的范围内。去除结果表明,总铬(TCr)、Cr(Ⅵ)和Cu(Ⅱ)的去除率均在94%以上,出水Cu(Ⅱ)、TCr和Cr(Ⅵ)的浓度分别为0.081.24、0.491.21和0.120.49 mg·L-1,出水pH在6~9之间,可以满足《污水综合排放标准》(GB 8978-7996)要求。
    Abstract: Hexavalent chromium (Cr(Ⅵ)) and copper (Cu(Ⅱ)) are important heavy metal contaminants in water body and wastewater. Electrocoagulation (EC), as an effective heavy metal removal technology, has been commonly applied currently, therefore, an electrocoagulation static reactor was used for simultaneous removal of combined contaminants of Cr(Ⅵ) and Cu(Ⅱ) in this study. The effects of electrode material, current density, initial pH, plate spacing and conductivity on electrocoagulation were investigated under monopolar connection conditions. The results showed that the aluminum electrode exhibits better simultaneous removal efficiency of Cr(Ⅵ) and Cu(Ⅱ) than the iron electrode. Factor screening experiment was done by using aluminum electrode and the results indicated that, when the experimental conditions were designed as follows: the influent concentration of Cr(Ⅵ) was from 12.98 mg·L-1 to 14.35 mg·L-1 and the influent concentration of Cu(Ⅱ) was from 18.73 mg·L-1 to 20.08 mg·L-1, the initial pH was in the range of 3 to 6,the current density was 11.57 A·m-2, the plate spacing was 1 cm and the conductivity was in the range of 899 μS·cm-1 to 2 000 μS·cm-1, then the removal efficiencies of total chromium(TCr),Cr(Ⅵ) and Cu(Ⅱ) were all beyond 94%. Accordingly, the effluent concentrations of Cu(Ⅱ), TCr and Cr(Ⅵ) were from 0.08 mg·L-1 to 1.24 mg·L-1,0.49 mg·L-1 to 1.21 mg·L-1 and 0.12 mg·L-1 to 0.49 mg·L-1, individually, and the effluent pH were between 6 and 9,which met the comprehensive wastewater discharge standard(GB 8978-7996).
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  • 刊出日期:  2018-02-08

电絮凝同步去除水中铜(Ⅱ)和铬(Ⅵ)复合污染物的影响因素及其作用机理

  • 1. 天津城建大学环境与市政工程学院,天津300384
  • 2. 天津市水质科学与技术重点实验室,天津300384
  • 3. 烟台大学土木工程学院,烟台264005
基金项目:

国家自然科学基金资助项目(51478292)

天津市水质科学与技术重点实验室开放基金资助项目(TJKLAST-PT-2016-05)

摘要: 铜(Cu(Ⅱ))和铬(Cr(Ⅵ))是水和废水中一类重要的重金属复合污染物。电絮凝(electrocoagulation, EC)是目前很有效的重金属深度处理技术,因此,采用电絮凝静态反应器对水中Cu(Ⅱ)和Cr(Ⅵ) 的复合污染物的同步去除进行研究。在单极式连接条件下,考察电极材料、电流密度、初始pH、极板间距和电导率等因素对电絮凝效果的影响。结果表明,与铁电极相比,铝电极显示出更好的Cu(Ⅱ)和Cr(Ⅵ)同步去除效果。因此,采用铝电极进行因素筛选实验,筛选出的实验条件为:Cu(Ⅱ)的进水浓度为18.73~20.08 mg·L-1,Cr(Ⅵ)的进水浓度为12.98~14.35 mg·L-1,在初始pH为3~6,电流密度为11.57 A·m-2,极板间距为1 cm,电导率在899~2 000 μS·cm-1的范围内。去除结果表明,总铬(TCr)、Cr(Ⅵ)和Cu(Ⅱ)的去除率均在94%以上,出水Cu(Ⅱ)、TCr和Cr(Ⅵ)的浓度分别为0.081.24、0.491.21和0.120.49 mg·L-1,出水pH在6~9之间,可以满足《污水综合排放标准》(GB 8978-7996)要求。

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