Carbon8 Systems (C8S) has developed a process called Accelerated Carbonation Technology (ACT) which uses CO2 to carbonate and treat a wide variety of industrial by-products and residues. The technology turns by-products such as fly ash, air pollution control residues (APCr), steel slags, and cement dusts, into mineralised products which can be sold as aggregates for a variety of applications in the construction industry.

CO2 is a necessary ingredient in C8S’ accelerated carbonation process; the technology captures CO2 that would otherwise be emitted into the atmosphere by exposing it to reactive compounds and minerals present in industrial residues. The carbonation reaction, which takes place at atmospheric temperatures and pressures, chemically and physically changes the composition of the residues, stabilizing heavy metal contaminants and permanently capturing the CO2.

The technology has been licensed in the UK for the treatment of Air Pollution Control Residues from Energy from Waste plants and there are now three fully commercial plants operating each treating approximately 40,000 tonnes of residue a year.

More recently, C8S has developed a modular containerized system, known as the CO₂ntainer, that captures CO2 directly from flue gas without the need for separation or purification and treats the residues that are also generated on site. The first full commercial installation of the CO₂ntainer, was delivered to a Vicat Group cement plant at Montalieu in France in July 2020 and was commissioned in November 2020. Additionally, a demonstration plant, treating thermal residues from the Energy from Waste industry, was deployed at AVR’s EfW plant at Duiven in The Netherlands in September 2020.

In addition to EfW and cement, other sectors where Carbon8 Systems patented Accelerated Carbonation Technology solution can be used include the steel industry and the paper industry.