Biogas production from co-digestion of corn stover and chicken manure under anaerobic wet, hemi-solid, and solid state conditions.

Highlights: [•] Synergistic effects were found in CS:CM ratios of 3:1 and 1:1. [•] In W-AD and HSS-AD, highest methane yields were obtained at CS:CM ratio of 3:1. [•] Highest volumetric productivity of 14.2L/L was found in SS-AD at CS:CM of 1:1. [•] VFA/TA value of 0.4 was a more important criterion than NH3-N or FA concentration. [ABSTRACT FROM AUTHOR]