It is well known that storage of animal manure and digestate causes emissions of methane (CH4), nitrous oxide (N2O) and ammonia (NH3). A crust on liquid manure acts both as a physical barrier for NH3 and as a biofilter that oxidize CH4 and NH3. However, N2O can be formed in some crusts, and there is currently a lack of knowledge on how to optimally design a crust in order to promote CH4 and NH3 oxidation without increasing N2O emissions.
The aims of this project are to:
• Investigate the physical, chemical and microbiological composition of different crusts and reveal connections to their CH4 oxidation capacity under Swedish climatic conditions.
• Evaluate if high CH4 oxidation capacity relates to risks for N2O production.
• Evaluate how much methane that can be oxidized in crusts with different origin