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Recent changes in regulations and scientific advances concerning selenium bioaccumulation have led to greater interest in non-biological treatment systems for selenium control in mine impacted and industrial waste water. BQE Water's Selen-IX™ process removes selenate from waste water to reach modern ultra-low selenium regulatory targets. Selen-IX™ combines selective ion exchange with electro-reduction of selenate in electrocells while producing a stable residue byproduct. This paper summarizes four years of pilot scale demonstration on a wide range of water chemistries and shows how Selen-IX™ and other non-biological technologies can be combined to remove inorganic tetravalent and hexavalent selenium as well as organoselenium species from impacted water to reach discharge targets ranging from 0.001 to 0.005 mg/L. A key aspect of cost effective removal of selenium via Selen-IX™ is the deportment of selenium in stable residue that does not require complicated handling or dedicated repositories.

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