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Green Steel Environmental

www.greensteelenvironmental.com ↗

Makes chemical-free wastewater treatment additives, including its flagship Green Steel PSR, an upcycled iron-rich product derived from steel slag (a steel manufacturing byproduct), used to remove phosphorus and sulfur from wastewater and purify biogas/RNG.

Circular Economy/Recycling
Funding
$3.44M
Stage
Seed
HQ
Boulder, CO
Founded
2023

The Current Angle

Commercializes CU Boulder research (started in 2017) into using an industrial waste byproduct, steel slag, to replace conventional chemical treatment additives, serving municipal wastewater plants, food/beverage processors, pulp and paper mills, and dairy farms.

Leadership

  • JJ
    Jon JonisCo-Founder
  • JT
    Jonathan TeafordCo-Founder

HQ location

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Last updated September 2026Sources: [1][2][3]