The synergies of co-digesting diverse waste streams and upgrading of biogas for natural gas use in the Stavanger region of Norway

The IVAR company is the organisation responsible for the provision of drinking water and wastewater treatment in the Stavanger region of Norway. IVAR also has responsibility for the management and treatment of solid waste in the region. It is the policy of the IVAR company to establish holistic environmental and beneficial solutions for treatment of wet organic waste from trade and industry which are subjected to new regulations.

Currently, the IVAR Regional Wastewater Treatment Plant ( RTWP) outside Stavanger is already receiving pre-treated food waste from institutional households and retail stores and waste products from fish processing factories which are subject to restrictions for the production of animal food. The planned receipt of these waste fractions will effectively double the biogas production and investigations have revealed that the most cost effective use of the biogas production is upgrading (carbon dioxide removal) and use in the adjacent natural gas system. The existing natural gas system is operated by the Lyse energy company and covers the entire Stavanger region with nearly 250,000 inhabitants and offers many interesting synergies for trade and commerce in the region. IVAR is therefore co-operating with the Lyse Energy company in order to promote the beneficial use of biogas. The first facility for upgrading of biogas to natural gas standards will be established in co-operation with Lyse at the RWTP in 2008. Available farmland is under severe pressure and there is a lack of available land to meet the future need of production expansions. This is especially the case for the local fur and poultry farming which are growing rapidly and among the largest producers in Norway. The need of available land for spreading the manure is therefore of vital importance for this trade. Moreover, renewed focus on food safety and environmental issues has further increased the pressure on the agricultural sector and it is of importance to secure future agricultural land as well as developing new innovative outlets for biosolids and waste products. Viewed in the light of this development IVAR, Lyse, the municipality of Hå and agricultural organisations are therefore planning a new large biogas plant for the co-digestion of food and, commercial wastes and agricultural manure in the southern part of the region. The biogas plant includes a separation/fertilising factory for the production of organic fertilisers based on the digested and heat treated effluent. The total investment costs for the entire plant is NOK 340 mill and the realisation of the project is dependent on state subsidies and if granted the plant is scheduled for commissioning within 2011. Together these biogas facilities will provide almost 100 GWh/ year of green energy to the natural gas system. However, the total biomass in the Stavanger region has potential to provide almost 300 GWh/year. Putting this into context, the Lyse company is currently selling 450 GWh/ year of natural gas derived from fossil fuels.



Copyright: © European Compost Network ECN e.V.
Quelle: Orbit 2008 (Oktober 2008)
Seiten: 8
Preis inkl. MwSt.: € 8,00
Autor: O. Tornes

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