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On dairy farms, enteric fermentation in ruminants and the handling of manure and slurry cause unwanted greenhouse gas (GHG) emissions. In contrast, anaerobic digestion (AD) through engineered systems yields biogas or biomethane as a renewable energy with negative net GHG emissions. The production and utilisation of methane-rich renewable gas represents an important pathway to achieve net-zero GHG emissions for dairy farms. This chapter explains how AD for biogas and biomethane production and methane utilisation can be implemented on dairy farms and how this contributes to achieving net-zero GHG emissions. Renewable methane from dairy manure and slurry could reduce global net GHG emissions by at least 1%, and AD systems on dairy farms can increase this potential by using co-substrates. However, it is estimated that less than 10% of this potential is currently being exploited. The chapter also outlines promising lines of research.
- 1 Introduction
- 2 Anaerobic digestion as a solution to producerenewable methane on dairy farms
- 3 Specifcities of dairy manure and slurry as feedstockfor methane production
- 4 Utilisation of the methane-rich gas
- 5 How methane utilisation obtained through anaerobicdigestion on dairy farms contributes to net-zero
- 6 Integration of anaerobic digestion into the dairy farmmanagement
- 7 Case studies
- 8 Conclusion and future trends
- 9 Where to look for further information
- 10 References