Bangladesh and neighbouring areas face health threats from drinking arsenic-contaminatedrngroundwater. The challenge is to develop arsenic remediation that is (1) affordable to most of the localrnpopulation, (2) robust and easy to maintain long term, (3) technically effective for removing arsenicrndown to 10 ?g/L in the presence of other competing ions in the water, and (4) does not require hazardousrnchemicals or produce excess levels of arsenic-laden waste. Electrochemical Arsenic Removal (ECAR)rnuses a small DC current and ordinary steel electrodes to produce iron rust in the arsenic-contaminatedrngroundwater that binds arsenic and can be removed by filtration. We describe performance results usingrnsynthetic and real groundwater and describe the design of a 100L reactor. We demonstrate lowrnproduction of waste sludge that is non-hazardous according to US EPA standards, and show preliminaryrnresults of successful sludge stabilization in concrete. Finally we estimate the operating costs.
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