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首页> 外文期刊>Desalination and water treatment >Electrochemical reduction of trichloroethylene using zero-valent iron bipolar packed-bed electrodes
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Electrochemical reduction of trichloroethylene using zero-valent iron bipolar packed-bed electrodes

机译：零价铁双极填充床电极电化学还原三氯乙烯

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摘要

Bipolar electrode system has been known to be more efficient than monopolar electrode system in electrolytes of low electrical conductivity. In this study, the bipolar packed-bed electrodes system was investigated to degrade trichloroethylene (TCE) in groundwater which has a poor inherent conductivity of groundwater. Direct current was supplied to columns packed with sand and zero-valent iron (ZVI). The external current makes the ZVI granules in the column act as bipolar electrodes. As a result, TCE was reduced up to 72% with HRT of 62 min. On average, the TCE reduction in 0.13 mM lasted for the experiment period of 1100 h with the electric current of 20 mA. The dominant by-product was ethane, which is a final product of TCE reduction pathways. However, in the column without supplied current, TCE was barely reduced during the experiment. Low concentrations of dechlorinated hydrocarbons were detected compared with the column with current supply, with acetylene showing the highest concentration. No significant changes in chloride concentrations and pH were observed. The total dissolved iron concentration increased with decreasing TCE and vice versa for both columns.
机译：已知在低电导率的电解质中双极电极系统比单极电极系统更有效。在这项研究中，研究了双极填充床电极系统以降解地下水固有电导率较差的地下水中的三氯乙烯（TCE）。向装有沙子和零价铁（ZVI）的柱子供应直流电。外部电流使色谱柱中的ZVI颗粒充当双极电极。结果，TCR降低了72％，HRT为62分钟。平均而言，在20 mA电流下，TCE降低0.13 mM持续了1100 h的实验时间。主要的副产物是乙烷，这是TCE还原途径的最终产物。但是，在没有供电电流的色谱柱中，实验期间TCE几乎没有降低。与带电源的色谱柱相比，检测到低浓度的脱氯烃，其中乙炔的浓度最高。没有观察到氯化物浓度和pH的显着变化。两根色谱柱的总溶解铁浓度均随着TCE的降低而增加，反之亦然。

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  • 来源
    《Desalination and water treatment》 |2014年第6期|900-908|共9页
  • 作者

    Ja-Won Shin; Yu-Ri Park; Jeong-Joo Kim; Won-Ho Choi; Joo-Yang Park;

  • 作者单位

    Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;

    Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;

    Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;

    Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;

    Department of Civil and Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Trichloroethylene; Dechlorination; Bipolar electrode; Permeable reactive barriers;

    机译：三氯乙烯;脱氯双极电极渗透性反应屏障;

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