Viessmann biogas purification technology helps to make CNG fuel from sewage

Posted: Monday 23rd November 2015

From 2016, one of the world's largest waste water treatment plants near Stockholm will purify biogas to natural gas quality biomethane for CNG-powered vehicles.

Viessmann biogas purification technology helps to make CNG fuel from sewage

From 2016, one of the world's largest waste water treatment plants near Stockholm will purify biogas to natural gas quality biomethane for CNG-powered vehicles.

Viessmann Group company, Schmack Carbotech, has won a contract to provide a gas upgrading plant at one of the world's largest underground waste water treatment plants. Through a process of purification, the facility will produce about 180 million kilowatt hours of natural gas quality biomethane annually from the metropolitan area of Stockholm’s sewage, covering up to 40 per cent of its annual CNG fuel needs.

The Henriksdal plant, owned by municipal water, waste water and waste management company, Stockholm Vatten AB, currently treats waste water 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 spring 2015.

The plant has a capacity to upgrade 3,000 m³/h of raw biogas. The gas that is produced has a methane content of 97 per cent after purification and is used as biofuel in natural gas vehicles. The need for CNG in Sweden is comparatively high, as 60 per cent 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 per cent 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 per year.

The Carbotech plants in Sofielund and Henriksdal will enable almost 17 per cent of Sweden's natural gas vehicles to run on climate-neutral fuel in the future.




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