Quantifying Reactive Transport Processes Governing Arsenic Mobility after Injection of Reactive Organic Carbon into a Bengal Delta Aquifer

被引:27
|
作者
Rawson, Joey [1 ,2 ,3 ]
Siade, Adam [1 ,2 ,3 ]
Sun, Jing [1 ,3 ]
Neidhardt, Harald [4 ]
Berg, Michael [5 ]
Prommer, Henning [1 ,2 ,3 ]
机构
[1] Univ Western Australia, Sch Earth Sci, Crawley, WA 6009, Australia
[2] Natl Ctr Groundwater Res & Training, Adelaide, SA 5001, Australia
[3] CSIRO Land & Water, Private Bag 5, Wembley, WA 6913, Australia
[4] Univ Tubingen, Dept Geosci, Ruemelinstr 19-23, D-72070 Tubingen, Germany
[5] Swiss Fed Inst Aquat Sci & Technol, Eawag, CH-8600 Dubendorf, Switzerland
关键词
DISSIMILATORY IRON REDUCTION; GROUND-WATER; WEST-BENGAL; MINERALIZATION PATHWAYS; FERROUS IRON; RELEASE; FERRIHYDRITE; CONSTRAINTS; BANGLADESH; MAGNETITE;
D O I
10.1021/acs.est.7b02097
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Over the last few decades, significant progress has been made to characterize the extent, severity, and underlying geochemical processes of groundwater arsenic (As) pollution in S/SE Asia. However, comparably little effort has been made to merge the findings into frameworks that allow for a process based quantitative analysis of observed As behavior and for predictions of its long-term fate. This study developed field-scale numerical modeling approaches to represent the hydrochemical processes associated with an in situ field injection of reactive organic carbon, including the reductive dissolution and transformation of ferric iron (Fe) oxides and the concomitant release of sorbed As. We employed data from a sucrose injection experiment in the Bengal Delta Plain to guide our model development and to constrain the model parametrization. Our modeling results illustrate that the temporary pH decrease associated with the sucrose transformation and mineralization caused pronounced, temporary shifts in the As partitioning between aqueous and sorbed phases. The results also suggest that while the reductive dissolution of Fe(III) oxides reduced the number of sorption sites, a significant fraction of the released As was rapidly scavenged through coprecipitation with neo-formed magnetite. These secondary reactions can explain the disparity between the observed Fe and As behavior.
引用
收藏
页码:8471 / 8480
页数:10
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