Abstract: The invention relates to an integrated set of equipment and a process for treating and refining highly contaminated biogas for the purpose of producing biomethane and to the supply thereof in small volumes of up to 10 m3/h to vehicles, such that the refining unit produces small quantities of biomethane per day to supply motor vehicles operating on the same premises as those where the biogas is produced, such as rural properties and small effluent treatment stations. The unit for refining biogas and supplying biomethane, referred to herein as a “biomethane microstation”, is an innovative technological concept wherein the microstation comprises the generation of the fuel and the distribution thereof for consumption on the same premises, using a compact biogas refining unit.