Advancement in Non-Biological Selenium Removal

TECHNICAL SUMMARY

Selenium management in mining and industrial wastewater has become increasingly complex due to stricter environmental regulations and the risks associated with bioaccumulation. Modern standards now extend beyond water quality to include ecological impacts such as fish tissue concentrations, making traditional treatment approaches less effective.

While biological treatment systems have historically been used, they present several limitations including instability under variable conditions, the generation of organoselenium compounds, and challenges related to long-term residue management. These constraints have driven interest in non-biological treatment alternatives.

This paper presents the Selen-IX™ process, which integrates ion exchange with electro-reduction to selectively remove and concentrate selenium species. The process converts dissolved selenium into a stable solid residue, eliminating the need for complex brine handling and reducing environmental risk. :contentReference[oaicite:0]{index=0}

Across four years of pilot-scale demonstrations, the system was tested on a wide range of mine-impacted waters. Results showed consistent removal of selenium species including selenate, selenite, and organoselenium compounds, achieving ultra-low discharge limits under varying operating conditions.

The study also demonstrates how multiple non-biological treatment stages can be integrated, including pretreatment, ion exchange, electro-reduction, and polishing, to achieve comprehensive selenium removal while maintaining operational flexibility and cost efficiency.