VAFABMiljö operates a waste treatment facility just outside the town of Vasteras in Central Sweden. The company treats municipal waste in an Anaerobic Digester and therewith produces biogas. For some years the biogas with 52% Methane is upgraded to biomethane with approximately 98% biomethane to make it suitable for Compressed Natural Gas (CNG) which can be used for fueling garbage trucks and the town buses.
Some of the buses are converted to use Liquefied Natural Gas (LNG) instead of CNG because their range in km with CNG proved to be too limited.
Stirling designed an integrated gas polishing & liquefaction plant for VAFABMiljö capable of delivering 2 ton/day of bioLNG. The plant was commissioned in June 2022.