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

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) ox...

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Bibliographic Details
Published in:Environmental science & technology 2012-11, Vol.46 (21), p.12038-12045
Main Authors: Li, Lei, van Genuchten, Case M, Addy, Susan E. A, Yao, Juanjuan, Gao, Naiyun, Gadgil, Ashok J
Format: Article
Language:English
Subjects:
Applied sciences
Arsenic - chemistry
Arsenic removal
Coagulation
Earth sciences
Earth, ocean, space
Electrocoagulation
Engineering and environment geology. Geothermics
Exact sciences and technology
Groundwater
Groundwaters
Iron - chemistry
Mathematical models
Models, Chemical
Natural water pollution
Oxidation
Oxidation-Reduction
Pollution
Pollution, environment geology
Reaction kinetics
Solution chemistry
Water Pollutants, Chemical - chemistry
Water Purification - methods
Water treatment and pollution
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Summary: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 μg/L As(III) to
ISSN:0013-936X
1520-5851
DOI:10.1021/es302456b