About Green Steel Environmental
At Green Steel Environmental, we’re on a mission to help wastewater treatment operators expand their efforts to drive up sustainability and drive down costs. Born from a commitment to innovation and sustainability, we are proud to introduce Green Steel PSR™ -- a breakthrough solution engineered to help wastewater treatment operators manage the removal of phosphorus and sulfur more safely, sustainably, and cost-effectively.
Green Steel PSR™ is the result of years of dedicated research, rigorous testing, and collaborative research with the University of Colorado.

Together, we’ve engineered a compelling alternative to the hazardous chemicals commonly used to remove phosphorus and sulfur from wastewater. At a time treatment facilities are facing soaring operational costs, environmental stewardship has never been more important. Instead of relying on hazardous chemicals that pose workplace safety risks and environmental threats, operators can look to us with confidence for a better solution.
We offer much more than a new technology. We’re on a journey to change the status quo – to replace legacy practices with practical, sustainable alternatives that benefit operators, ecosystems and the communities they serve. We believe that wastewater professionals shouldn’t have to choose between performance, safety, and sustainability. By partnering with us, they don’t have to.
From Academic Research to Commercial Scale
2017
Hernandez lab at University of Colorado starts research on using steel-manufacturing residuals in wastewater treatment.
2017-2018
Pilot testing of PSR™ precursor product at City of Boulder, Colorado Water Resource Recovery Facility.
2018
Results of pilot test of PSR™ precursor product in digesters published as a peer-reviewed article in WRF.
2018
Patent filed for first of multiple forthcoming inventions with the USPTO.
2020
Pilot testing of PSR™ precursor product for biogas scrubbing.
2023
Commercial discovery begins. Green Steel Environmental incorporated.
2023
Second patent application filed for use of PSR™ precursor product for biogas scrubbing.
2025
Commencement of first commercial-scale implementation.
2026
Demonstrated lab scale performance translated at scale.
