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component of the biogas), emissions of this greenhouse gas are also reduced. After the digestion process, the residue has a less oxygen- consuming composition than the original manure. This residue has a fertilising effect 1020% better than untreated manure, with no significant increase in odour. Performance Biogas produced in the reactor drives a 450 kW generator which is connected to the grid (at 20 kV). Heat from the motor and the exhaust gases is recovered by heat exchangers which provide 650 kWth to the district heating system. Excess gas is used in a combined biogasnatural gas boiler with a capacity of 1.3 MWth. To cover peak loads, a 1.3 MW natural gas boiler is also available. The energy efficiency of the CHP plant is 8590% and the amount of heat and electricity produced is 4,200 MWh and 2,000 MWh respectively. The CHP plant supplies the Trädgårdsstaden with 6070% of its energy demand. The total amount of energy supplied in 1997 was 7,500 MWh. Economics Investment in the biogas plant totalled e1.5 million (where e is the euro). Of this, 26% was funded by a Swedish government grant, the remaining finance was provided by capital from municipalities and The interior of the combustion house. private sources capital (26%) and bank loans (48%). The investment is expected to be recovered in 15 years, through waste reception fees and sales of biogas. The total investment needed for the CHP plant at the housing development, the boilers and the district heating system was also e1.5 million. This was financed through interest-free loans (e340,000) and grants (e126,000) from the Swedish Council for Building Research. The gas motor. Technical Brochure No.112PDF Image | Biogas Combined Heat and Power in Sweden
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