Effects of seasonal and local co-feedstocks on the performance of continuous anaerobic digestion of cattle slurry

The study's aim was to assess the robustness of farm-type anaerobic digestion with cattle slurry as main feedstock under change co-feedstock type and quality. Fish biomass, rainbow trout offal, potato, reindeer offal were investigated possible co-feedstocks in a 428-day semi-continuous reactor experiment. Using fish biomass or (19 % VS feed) produced an average 220 305 L CH 4 /kg compared 201 for manure control. For other co-feedstocks, differences not statistically significant. Despite recommendations acclimate biogas process new feedstocks caution, no disturbances observed, even sudden changes co-feedstocks. use locally available seasonal improved agronomic quality digestates could be important securing farms' supply self-sufficiency both energy fertilizers. • Manure-based tolerated rapid changes. production increased grass silage. mass showed highest production. Co-feedstocks nutrient usability on farm. Local utilization benefit farm-scale plants.