Modeling As(III) Oxidation and Removal with Iron Electrocoagulation in Groundwater
Modeling As(III) Oxidation and Removal with Iron Electrocoagulation in Groundwater
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DOI：
10.1021/es302456b
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发表时间：
2012-11-06
影响因子：
11.4
通讯作者：
Gadgil, Ashok J.
中科院分区：
文献类型：
--
作者：
Li, Lei;van Genuchten, Case M.;Gadgil, Ashok J.
了解电凝聚(EC)过程中砷的化学动力学对于更深入地理解在各种操作条件和溶液组成下电凝聚(EC)去除砷是必不可少的。我们使用从我们的一些实验结果和以前的研究中提取的模型参数，描述了EC体系中As(III)氧化和As(III，V)、Si和P吸附的一个高度受限的简单化学动力学模型。我们的模型预测与从以前的研究中提取的数据和我们在广泛的操作条件(电荷剂量率)和溶液化学(pH，共生离子)范围内观察到的实验数据在没有自由模型参数的情况下都符合得很好。我们的模型解释了为什么较高的pH和较低的充电剂量率(库仑/L/分钟)有助于EC去除As(III)，并揭示了最近发表的文献中关于EC过程中As(III)氧化机制的争论。我们的模型还提供了实际有用的估计，即去除500微克/L所需的最低铁量为(III)至
Understanding the chemical kinetics of arsenic during electrocoagulation (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(III) 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 mu g/L As(III) to