Researchers from the University of Colorado launched Green Steel in 2023 to develop a cheaper and environmentally-friendly replacement for ferric chloride, ferric sulfate and aluminum sulfate, hazardous chemicals commonly used to treat wastewater.
Green Steel PSR, made from steel slag, a byproduct of steel manufacturing, sequesters harmful nutrients like phosphate and sulfide during the treatment process.
Wastewater treatment facilities in the US process roughly 34 billion gallons of wastewater each day, according to the US Environmental Protection Agency.
Green capital
The cost to treat a million gallons of wastewater can reach $12 million. Boulder-based Green Steel says environmental stewardship has never been more important.
The new financing round was led by the Central Texas Angel Network, with backing from Cowtown Angels and others.
Green Steel is looking to patent a biogas treatment product that converts hydrogen sulfide and other co-contaminants into renewable natural gas.
