Possiblities for separated fraction from biogasproduction - Pre-project

A situation where the fibre fraction is returned after the biogas production without further treatment is used as reference. The project is carried out with the purpose of being able to assess whether burning or gasifying the separated fibre fraction should be prioritised in the future national energy research and development programmes by the Danish Energy Authority and the Transmission System Operators. The overall conclusions of the project are that: 1) Burning/gasification is problematic with the existing legislation. 2) There can be potential in burning or gasification of the fibre fraction, but it should be investigated closer through practical tests, which can illustrate practical problems, emission of NO_x and organic connections as well as the chemical composition of the ashes. 3) Burning or gasification of the fibre fraction will overall have a limited effect with regards to loss of nutrients seen in relation to spreading of raw manure. It will thus still be possible to adhere to existing legislative demands with regards to utilisation of nitrogen in the raw manure. However, there will be a lesser utilisation of the nitrogen when burning/gasifying than when spreading the fermented and degassed manure