Gas upgrade at Swedish wastewater treatment site will help meet CNG needs
Schmack Carbotech, part of Viessmann Group company, has won a contract to provide a gas upgrading plant at one of the world's largest underground wastewater treatment plants. Through a process of purification, the facility will produce 180 million kilowatt hours of natural gas quality biomethane annually from the metropolitan area of Stockholm's sewage, covering up to 40% of its annual CNG fuel needs.
Stockholm Vatten's Henriksdal plant currently treats wastewater from around one million inhabitants, extracting biogas from sewage sludge. This will now be purified and upgraded to natural gas quality using the pressure swing adsorption (PSA) process. This method of gas upgrading is characterised by low power consumption, efficient heat extraction and a high methane yield.
The company built a similar plant for upgrading biogas from organic waste in Sofielund, Stockholm in 2015.
The plant has a capacity to upgrade 3,000m³/h of raw biogas. The gas that is produced has a methane content of 97% after purification and is used as biofuel in natural gas vehicles. The need for CNG in Sweden is comparatively high, as 60% of public buses already use fuel from renewable energy sources such as biogas, bioethanol or biodiesel.
The demand for and acceptance of environmentally friendly technologies is high in Sweden: 40% of newly registered cars are powered by biogas or electricity. By using biofuels in its public transport system, Stockholm saves 130,000 tonnes of environmentally harmful CO2 a year.
The Carbotech plants in Sofielund and Henriksdal will enable almost 17% of Sweden's natural gas vehicles to run on climate-neutral fuel in the future.
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