Bergen Biogas Plant, Norway

Bergen Biogas Plant in Norway accepts biological sludge, chemical sludge and other types of sludge and grease from different sewage treatment plants and factories. The plant processes 45,000 cubic meters of mixed sludge annually with a dry solid concentration of 22.5%. It is equipped with two digestion tanks with a volume of 3,200 cubic meters each, adopting 55-degree centigrade thermophilic anaerobic digestion. The biogas generated from anaerobic digestion is upgraded into vehicle natural gas, and the residue is reused as bio-fertilizer in farmland.

Purac is responsible for the process design, equipment supply, start-up and operation as well as process guarantee of this project.

Feed:

Sewage sludge: 34,877 tons/year

Septic tank sludge: 2,360 tons/year

Food waste: 7,817 tons/year

Oil: 183 tons/year

Fat: 90 tons/year

Total: 45,327 tons/year

Products:

Biogas: 10,650 Nm³/day

Bio-fertilizer: 20,500 tons/year