| abstract |
The present invention relates to a method for removing arsenic from water, in particular in situ from groundwater by precipitation of arsenic after contacting with aqueous iron hydroxide, which allows under oxidizing conditions, ie a high redox potential, a stable immobilization of the arsenic in an aqueous environment. In the process, arsenic-containing water is mixed with an aqueous solution of iron (II) and subsequently with oxygen-enriched water. This reaction with an Fe 2+ solution and separately, before or after, with oxygen-enriched water is repeated, optionally with intermediate rest periods. For the elimination of arsenic, including arsenic contained in organic compounds from groundwater, it is possible to directly introduce the oxygen-enriched water and the Fe 2+ solution into aquiferous soil layers. |