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Befesa S.A. offers environmental recycling services to the steel and aluminum industries in European, Asian, and North American markets. It operates through two segments, Steel Dust Recycling Services and Aluminium Salt Slags Recycling Services. The Steel Dust Recycling Services segment collects and recycles crude steel dust and other steel residues generated in the production of crude, stainless, and galvanized steel; sells waelz oxide to zinc smelters; and treats crude steel dust. The Aluminium Salt Slags Recycling Services segment recycles salt slags; spent pot linings, a hazardous residue generated by primary aluminium producers; and recovers and sells salt, aluminium concentrate, and aluminium oxides. This segment also collects and recycles aluminium scrap and other aluminium residues, such as aluminium dross, shavings, cuttings, and aluminum concentrates; and produces secondary aluminium alloys for automotive and construction industries. It also provides logistics, and waelz oxide and aluminum waste treatment services, as well as develops projects and technology. Befesa S.A. was founded in 1987 and is based in Luxembourg City, Luxembourg.

Clean TeQ Holdings Limited, together with its subsidiaries, provides metals recovery and industrial water treatment services primarily in Australia. It operates in two segments, Water and Metals. The Water segment offers Continuous Ionic Filtration, Macroporous Polymer Adsorption, and Graphene Oxide and BIOCLENS resin technologies to filter, separate, purify, and recycle polluted water for drinking, agricultural, recreational, and industrial uses. The Metals segment provides Clean-iX resin technology for the extraction and purification of a range of resources, including base and precious metals, as well as radioactive elements, such as uranium. This segment is also involved in the development of the Sunrise project in New South Wales. Clean TeQ Holdings Limited was founded in 1990 and is based in Notting Hill, Australia.

CleanTech Alpha Corporation develops and commercializes clean technologies that facilitate the use of natural resources for the ethanol industry in the United States. The company's corn oil extraction technology integrates into the back-end of existing dry mill corn ethanol plants to extract and recover inedible crude corn oil, which is used in the production of advanced carbon-neutral liquid fuels and other biomass-derived alternatives to fossil fuel-based products. The company licenses its technologies to ethanol producers. The company was formerly known as GreenShift Corporation and changed its name to CleanTech Alpha Corporation in August 2021. CleanTech Alpha Corporation was founded in 1984 and is headquartered in Oklahoma City, Oklahoma.