In this workshop, you will learn how a simple iron oxide coating process was developed to employ a sustainable and cost-effective in situ coating technique for treating arsenic-contaminated groundwater. To in situ emplace iron oxide coatings on soil particles, ferrous salt, and dissolved oxygen solutions were periodically injected into a sand matrix following a specially designed injection scheme. The resulting adsorption, diffusion, and redox reactions could continuously deposit large quantities of ferric oxide onto soil particle surfaces, thus creating constantly-refreshed reactive surfaces for continuous adsorption and co-precipitation of arsenic and other heavy metals.

1 CEP