Methane production from anaerobic co-digestion of the separated solid fraction of pig manure with dried grass silage

► Co-digestion succeeded at dried grass silage ratios of 40% in the feedstock. ► The organic loading rate affected methane yields more than the grass silage ratio. ► Tripling the organic loading rate increased the volumetric methane yield. ► The post-methane production potential increased with the organic loading rate.