Green Steel Environmental to Show Full-Scale Pilot Data at WEFTEC 2026

Green Steel Environmental will preview full-scale results from its first municipal deployment at WEFTEC 2026 in New Orleans, where the Boulder cleantech company will show data from the City of Boulder’s Water Resource Recovery Facility. The showcase matters because the company is positioning its upcycled steel-slag additive as a replacement for hazardous wastewater chemicals and a potential fit for broader industrial uses.

Why it matters: - Green Steel Environmental is moving from lab validation to full-scale field results, a key step for a wastewater treatment technology trying to win operator trust. - The company’s additive is designed to replace hazardous chemicals such as ferric chloride, which could reduce workplace risk and infrastructure corrosion at treatment plants. - The technology also has potential uses beyond municipal wastewater, including biogas, renewable natural gas, dairy, food processing, pulp and paper, breweries and distilleries.

What happened: - Green Steel Environmental is previewing its WEFTEC 2026 booth plans ahead of the exhibit hall opening September 28 in New Orleans. - Booth #7946 will feature the first public look at full-scale performance data from the company’s first municipal deployment of Green Steel PSR™. - The deployment is running at the City of Boulder’s Water Resource Recovery Facility, with the pilot starting in early June. - Company leadership will be on-site throughout WEFTEC, which runs Monday, September 28 through Wednesday, September 30. - Media can schedule interviews at the booth ahead of the show.

The details: - Green Steel PSR™ is a patented additive made from upcycled steel slag. - The product adsorbs phosphorus and sulfur. - The Boulder deployment has removed 13,000 lbs of phosphate. - The system has cleaned 14M SCF of methane. - The pilot has displaced 12,000 gallons of hazardous chemicals. - The project has treated 1.2B gallons of wastewater, in part, since the pilot began. - The company plans to walk attendees through how steel slag, which would otherwise sit in mill stockpiles as low-value roadway aggregate, is converted into a treatment product. - Green Steel Environmental says the technology has cleared EPA 503, EPA WET and EPA TCLP testing. - The product was validated in a peer-reviewed article published in Water Environment Research, the journal of the Water Environment Federation. - Green Steel Environmental will also outline where additional pilots are underway. - The company is highlighting applications for operations that need to control phosphorus and/or hydrogen sulfide. - The company’s recent momentum includes a $2.2 million seed round closed in January 2026. - Green Steel Environmental was also named a SXSW Pitch 2026 finalist in the Sustainability, AgTech & Food category.

Between the lines: - The WEFTEC appearance is less about introducing the concept and more about proving performance in a real plant. - The company is framing steel slag as a circular-economy input, turning an industrial byproduct into a wastewater treatment material. - The emphasis on safer chemistry suggests a pitch that combines operational efficiency, sustainability and worker safety. - The broader industrial use cases signal a push to move beyond municipal water plants into adjacent process industries.

What’s next: - Green Steel Environmental is using WEFTEC to court operators, engineers and potential pilot partners. - The company expects to use the Boulder results to support further deployments across wastewater and industrial treatment settings. - Interested media are being asked to contact the company to arrange interviews before the show.

The bottom line: - Green Steel Environmental is bringing field data, not just a product pitch, to WEFTEC 2026.