Norske Skog is a world-leading producer of paper for magazines and newspaper. For its Saugbrugs paper mill in Halden, Norway, Norske Skog chose a Pentair Haffmans’ biogas upgrading system to process biogas from the sewage-treatment plant and generate an additional value stream. Norske Skog operates nine paper mills worldwide and the Saugbrugs plant is one of the company’s largest and most energy-efficient. With a history that dates back to 1575, the site currently has three supercalendered magazine paper production machines with a combined 500,000 tons annual capacity. Norske Skog’s move into biogas production strengthens the mill’s competitiveness and provides a positive addition to renewable energy usage in the region. To celebrate the opening of the Saugbrugs biogas and nano-pulp plant, an open day for the whole community of Halden, which included an official ceremony with King Harald of Norway, was held in early April. The biogas plant is connected to the existing sewage-treatment plant and uses sewage sludge from the paper production. Pentair Haffmans supplied a multi-stage membrane-based biogas upgrading system with a raw gas capacity of 600 Nm3/h that is upgraded to approximately 490 Nm3/h of biomethane. The biomethane is compressed to CNG (compressed natural gas) and sold to an external gas supplier with the intention of using the gas to power a fleet of 70 buses and trucks in the region. The compact structure of Pentair Haffmans’ biogas upgrading system was a major advantage for easy transport and installation. All components were preassembled on cubic steel skids and were converted into a weatherproof building onsite by attaching sidewalls and ceiling panels. The installation is accessible from all sides and even with the compact design there is adequate space to make modifications, repairs or overhauls. Since entering the biogas upgrading market in 2010, Pentair’s innovative biogas upgrading technology has proven very successful. To date, more than 40 biogas-upgrading projects have been completed, or are in progress, in the Netherlands, Germany, France, the UK, South Africa, the Philippines and the USA. The Saugbrugs installation is Pentair’s first project in Scandinavia and marks another important milestone for the company. Contact: Ivan Rigney, sales director UK, Ireland, Russia, CIS, Scandinavia and Baltics. Phone: (01) 206 3546. Email: ivan.rigney@pentair.com. For more information on Pentair’s biogas upgrading technology, please visit www.biogas.pentair.com. Take the opportunity to meet with our biogas experts at selected biogas events in the coming months:

• UK Biomethane Day, May 24, Birmingham
• UK AD & Biogas, July 5-6, Birmingham