Journal
ENERGIES
Volume 13, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/en13153804
Keywords
anaerobic digestion; co-digestion; energy crops; manure; Salix
Categories
Funding
- Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (Formas) [2016-20031]
- StandUp for Energy program
- Formas [2016-20031] Funding Source: Formas
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Animal manure represents a major source of renewable energy that can be converted into biogas using anaerobic digestion. In order to most efficiently utilize this resource, it can be co-digested with energy dense, high biomethanation potential feedstocks such as energy crops. However, such feedstocks typically require pretreatments which are not feasible for small-scale facilities. We investigated the use of single-stage and the sequential co-digestion of comminuted but otherwise non-pretreatedSalixwith animal manure, and further investigated the effects of coppicing frequency and clone choice on biomethanation potential and the area requirements for a typical Swedish farm-scale anaerobic digester usingSalixand manure as feedstock. In comparison with conventional single-stage digestion, sequential digestion increased the volumetric and specific methane production by 57% to 577 NmL L(-1)d(-1)and 192 NmL (g volatile solids (VS))(-1), respectively. Biomethanation potential was the highest for the two-year-old shoots, although gains in biomass productivity suggest that every-third-year coppicing may be a better strategy for supplyingSalixfeedstock for anaerobic digestion. The biomethane production performance of the sequential digestion of minimally pretreatedSalixmirrors that of hydrothermally pretreated hardwoods and may provide an option where such pretreatments are not feasible.
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