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ARSENIC IMMOBILIZATION BY IN-SITU IRON COATING FOR MANAGED AQUIFER REHABILITATION
Pi, K., X. Xie, T. Ma, C. Su, J. Li, and Y. Wang.
Water Research 181:115859(2020)
A pilot-scale study examined a managed aquifer rehabilitation (MAR) approach to remediate As-contaminated groundwater at the Datong Basin, northern China. Periodic injection of Fe2+ and ClO- solutions into the aquifer generated Fe-oxide coatings on sediment surfaces and prompted the buildup of weakly alkaline/circumneutral and oxidizing conditions to enhance As(III) oxidation. Dissolved As concentrations decreased from 78.0 µg/L to 9.8 µg/L over a 25-day amendment. The ~10 µg/L As level was maintained during a 215-day monitoring period. The technology may be applicable for As-affected aquifers with controlled oxidizing conditions in the Datong Basin and likely other high-As regions with similar hydrogeochemical settings.
Water Research 181:115859(2020)
A pilot-scale study examined a managed aquifer rehabilitation (MAR) approach to remediate As-contaminated groundwater at the Datong Basin, northern China. Periodic injection of Fe2+ and ClO- solutions into the aquifer generated Fe-oxide coatings on sediment surfaces and prompted the buildup of weakly alkaline/circumneutral and oxidizing conditions to enhance As(III) oxidation. Dissolved As concentrations decreased from 78.0 µg/L to 9.8 µg/L over a 25-day amendment. The ~10 µg/L As level was maintained during a 215-day monitoring period. The technology may be applicable for As-affected aquifers with controlled oxidizing conditions in the Datong Basin and likely other high-As regions with similar hydrogeochemical settings.
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