Mechanistic investigations of Se(VI) treatment in anoxic groundwater using granular iron and organic carbon: An EXAFS study

► We investigate treatment of aqueous Se(VI) under anoxic conditions. ► We utilize granular Fe0 and organic carbon to promote Se(VI) removal. ► We characterize Se speciation using X-ray absorption spectroscopy. ► Granular Fe0 promotes removal of Se(VI) by reduction to Se(0). ► Organic carbon promotes removal through sorption processes without reduction.