State Water Resources Research Institute Program

Project ID: 2009TX329B
Title: In Situ Groundwater Arsenic Removal using Iron Oxide Coated Sand
Project Type: Research
Start Date: 3/01/2009
End Date: 2/28/2010
Congressional District: 17
Focus Categories: Groundwater, Toxic Substances, Treatment
Keywords: Arsenic, Iron oxide coated sand, Adsorption, Groundwater, In situ
Principal Investigators: Yu, Hongxu; Huang, Yongheng
Federal Funds: $ 5,000
Non-Federal Matching Funds: $ 10,000
Abstract: Iron oxide-bearing minerals have long been recognized as an effective reactive media for arsenic (As) remediation. In this project, we propose to use a unique iron oxide coating technique we invented to develop a cost-effective in situ treatment technique for removing arsenic from contaminated groundwater. To in situ emplace iron oxide coatings on soil particles, ferrous salt and sodium hypochlorite solutions will be periodically injected into soil matrix following a special designed injection scheme. The resulting adsorption, diffusion, and redox reaction could continuously deposit large quantities of ferric oxide onto the surface of soil particles, thus creating a constantly-refreshed reactive surface for continuously adsorption and co-precipitation of arsenic and other heavy metals. Our bench-scale column tests have shown that the technique could rapidly and sustainably remove arsenic from synthetic water spiked with arsenic. To further develop this technique for groundwater arsenic treatment, we propose to conduct scale-up column tests using real groundwater to further elucidate the mechanism and kinetics of arsenic removal and to develop a model to predict the performance of the system.

Progress/Completion Report, 2009, PDF

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