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A biogas upgrader is a facility that is used to concentrate the methane in biogas to natural gas standards. The system removes carbon dioxide , hydrogen sulphide , [ 1 ] water and contaminants from the biogas.
An upgrader is a facility that upgrades bitumen (extra heavy oil) into synthetic crude oil. Upgrader plants are typically located close to oil sands production, for example, the Athabasca oil sands in Alberta , Canada or the Orinoco tar sands in Venezuela .
In the early 2000s the facility was subject to numerous safety audits and facility upgrades, completed in 2004. In 2005, Greka shut the plant down temporarily in a planned 10-year turnaround to upgrade the equipment further, and in November of that year received a permit to process wastewater, which is now used to irrigate surrounding cropland.
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