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Koldioxidsutsläppsbesparing vid biogasproduktion

Society has depended on fossil-based fuel for a long time, which has led to a fundamental increase of greenhouse gases in the Earth?s atmosphere. To tackle this problem the international community has agreed that action is necessary. Focus is now directed towards local extraction of energy from renewable sources such as biogas.Utö is participating in the Green Island project, which aims to investigate the possibility of making the island climate neutral. This report has been implemented on behalf of Skärgårdsstiftelsen, the main partner responsible for the Green Island project in Sweden. The report aims to investigate the possibility of a small scale biogas plant on Utö in the Stockholm Archipelago. Focus is on how much the biogas plant reduces the global warming potential and if it is economically profitable.It was concluded that a biogas plant with 100 m3 digester and a substrate volume of 1000 m3 per years is well adapted to the islands environment. CHP with the unit Cleanergy V161 reduces the GWP with 29 000 kg CO2 per year, but is not economically profitable. The economic gain depends on the ability to sell the residue sludge or getting a subsidy. With sales of the sludge, profitability is achieved at a price of 70 SEK/ton sludge.The conclusion is that the opportunity of a biogas plant on Utö is good, but requires a number of factors to be further investigated. The proposal for further work includes an inventory of potential substrates, the possibility of subsidy funding and potential income from sludge sales.

Författare

Therese Camaj Ericson Elin Lindblad

Lärosäte och institution

KTH/Energiteknik

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