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Gardermoen treatment plant, which are situated in Ullensaker municipality near Oslo Airport Gardermoent, processes sewage water. The treatment plant also receive glycol from Oslo Airport Gardermoen.The treatment plant receives sewage from approximately 30 000 people, as well as water from the industry and business sector.The treatment plant shall now replace the existing gas dome, type horizontal from Eisenbau Heilbronn, volume 100 m3, with a new gas dome made of double or threefold diaphragm. The new volume shall be 200 m3. In addition some of the equipment in the gas system shall be doubled.