Mitsubishi Heavy Industries has begun an underground injection of carbon dioxide (CO²) at a carbon capture and sequestration (CCS) demonstration project, in Alabama, US.
A total of 500 metric tonnes per day of CO² will be injected at the project site, following approval granted by the state government of Alabama.
The CO² is recovered from emissions which contains significant quantities of impurity from a coal-fired power generation plant.
Mitsubishi Heavy Industries and US utility Southern Company have jointly built the CCS demonstration project, which has a CO² recovery efficiency above 90%.
The project, said to be the world's largest in terms of scale, comprises a flue-gas scrubber, flue-gas CO² capture/re-generation system, CO² compression machinery and electrical components.
At the demonstration site, CO² will be sequestered in a saline formation at a depth of 3,000m to 3,400m in the Citronelle Dome geologic structure, which is approximately 12 miles west from the plant.
The sequestration aspect of the project is being conducted as Phase III of the Regional Carbon Sequestration Partnerships programme, a scheme sponsored by the US Department of Energy.
Mitsubishi Heavy Industries is in charge of basic planning, engineering, core equipment supply and provision of technology support for the project.