Green Steel Environmental brings pilot data to WEFTEC 2026

Green Steel Environmental is using WEFTEC 2026 in New Orleans to show results from its first full-scale pilot of Green Steel PSR™, a slag-based additive that replaces hazardous wastewater chemicals. The Boulder company says the pilot has already removed phosphorus, cleaned methane and cut chemical use at the City of Boulder’s Water Resource Recovery Facility.

Why it matters: - Wastewater plants face tighter phosphorus limits, hazardous chemical handling burdens and rising operating constraints. - Green Steel Environmental is pitching Green Steel PSR™ as a replacement for ferric chloride and other corrosive treatment chemicals. - The early pilot data could influence how operators evaluate lower-risk options for wastewater and biogas treatment.

What happened: - Green Steel Environmental announced it will showcase performance data from its first full-scale pilot at WEFTEC 2026 in New Orleans, Sept. 28–30, at the Ernest N. Morial Convention Center. - The company is exhibiting at Booth #7946. - Green Steel Environmental will present Green Steel PSR™, a patented additive made from upcycled steel slag. - The product is designed to replace hazardous treatment chemicals in wastewater and biogas operations.

The details: - Since early June, Green Steel PSR™ has been deployed at the City of Boulder’s Water Resource Recovery Facility. - The pilot has removed 13,000 pounds of phosphate from wastewater. - The pilot has cleaned 14 million standard cubic feet of methane. - The pilot has displaced the equivalent of 81,000 pounds gallons of hazardous chemicals from local water systems. - The pilot has treated 1.2 billion gallons of wastewater, in part. - Green Steel PSR™ has cleared EPA 503 testing for land application. - Green Steel PSR™ has cleared EPA WET testing for effluent toxicity. - Green Steel PSR™ has cleared EPA TCLP testing for landfill. - The science behind the product was validated in a peer-reviewed article published in Water Environment Research, the journal of the Water Environment Federation. - Boulder’s plant treats 10 million gallons per day. - The facility serves more than 200,000 residents and commuter workers. - The plant faced tightening state phosphorus limits, a chloride discharge ceiling and a $12 million bio-P system that could not meet upcoming targets. - The plant also faced the hazardous-materials handling burden of ferric chloride. - Green Steel PSR™ comes from a steel mill in Pueblo, Colorado, about 150 miles from Boulder. - The additive is introduced upstream of the plant’s anaerobic digesters. - The material exits with biosolids that are land-applied on local agricultural land. - Green Steel Environmental is also evaluating the product for biogas and renewable natural gas producers, dairy farms, food processing plants, pulp and paper mills, breweries and distilleries. - Those facilities need to control phosphorus and/or hydrogen sulfide. - Green Steel Environmental closed a $2.2 million seed round in January 2026. - The seed round was led by the Rockies Venture Club, Central Texas Angel Network, Cowtown Angels and Baylor Angel Network. - The company was named a SXSW Pitch 2026 finalist in the Sustainability, AgTech & Food category. - The company’s website is greensteelenvironmental.com. - The company’s LinkedIn page is Green Steel Environmental on LinkedIn.

Between the lines: - Green Steel Environmental is trying to turn steel slag, usually a low-value roadway aggregate, into a higher-value wastewater input. - The company is positioning the product around a simple operational message: fewer hazardous chemicals, less handling risk and lower treatment complexity. - The Boulder pilot gives the company a live municipal case study at a time when utilities are under pressure to meet stricter discharge rules.

What's next: - Green Steel Environmental plans to use WEFTEC 2026 to give operators and engineers a walkthrough of how Green Steel PSR™ works. - Company leadership will be available for interviews during the conference. - The company is continuing evaluations in wastewater, biogas and other industrial settings where phosphorus or hydrogen sulfide control is needed.

The bottom line: - Green Steel Environmental is bringing real-world pilot data to WEFTEC to argue that steel slag can replace hazardous chemicals in wastewater treatment and biogas operations.