Air Liquide and Puregas Solutions AB have joined forces to develop the biogas market in Europe. The two companies have signed an agreement to access their respective biogas upgrading technologies. Air Liquide and Puregas Solutions commissioned a first joint membrane upgrading unit in Rybjerg, in northern Denmark, with a capacity of 900Nm3/h of biogas from agricultural waste. The upgraded biogas will typically be used for vehicle fuelling (Bio-NGV).