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Modeling As(III) Oxidation and Removal with Iron Electrocoagulation in Groundwater

机译:铁电凝在地下水中模拟As(III)氧化和去除

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摘要

Understanding the chemical kinetics of arsenic during electro-coagulation (EC) treatment is essential for a deeper understanding of arsenic removal using EC under a variety of operating conditions and solution compositions. We describe a highly constrained, simple chemical dynamic model of As(IIl) oxidation and As(III,V), Si, and P sorption for the EC system using model parameters extracted from some of our experimental results and previous studies. Our model predictions agree well with both data extracted from previous studies and our observed experimental data over a broad range of operating conditions (charge dosage rate) and solution chemistry (pH, co-occurring ions) without free model parameters. Our model provides insights into why higher pH and lower charge dosage rate (Coulombs/L/min) facilitate As(III) removal by EC and sheds light on the debate in the recent published literature regarding the mechanism of As(III) oxidation during EC. Our model also provides practically useful estimates of the minimum amount of iron required to remove 500 μg/L As(III) to <50 μg/L. Parameters measured in this work include the ratio of rate constants for Fe(II) and As(III) reactions with Fe(IV) in synthetic groundwater (k_1/k_2 = 1.07) and the apparent rate constant of Fe(II) oxidation with dissolved oxygen at pH 7 (k_(app) = 10~(0.22) M~(-1)s~(-1)).
机译:深入了解电凝(EC)处理期间砷的化学动力学,对于更深入地了解在各种操作条件和溶液组成下使用EC去除砷至关重要。我们使用从一些实验结果和先前研究中提取的模型参数,描述了EC系统的As(IIl)氧化和As(III,V),Si和P吸附的高度受限,简单的化学动力学模型。我们的模型预测与从先前研究中提取的数据以及我们在无自由模型参数的广泛操作条件(电荷剂量率)和溶液化学(pH,共生离子)的广泛实验条件下得出的数据非常吻合。我们的模型提供了有关为何较高的pH值和较低的电荷剂量率(库仑/升/分钟)有助于EC去除As(III)的见解,并阐明了最近发表的有关EC期间As(III)氧化机理的文献的争论。我们的模型还提供了去除500μg/ L As(III)至<50μg/ L所需的最低铁含量的实用估算。在这项工作中测量的参数包括合成地下水中Fe(II)和As(III)与Fe(IV)反应的速率常数之比(k_1 / k_2 = 1.07)和溶解状态下Fe(II)氧化的表观速率常数pH为7的氧气(k_app = 10〜(0.22)M〜(-1)s〜(-1))。

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  • 来源
    《Environmental Science & Technology》 |2012年第21期|12038-12045|共8页
  • 作者单位

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China,Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, United States;

    Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, United States;

    Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, United States;

    Key Laboratory of the Three Gorges Reservoir Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China;

    State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;

    Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, California 94720, United States,Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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