Search

• F/I ratio influences the degradation of lignocellulosic biomass constituents. • F/I ratio of 0.5 led to the lowest VFAs accumulation in during all co-digestions. • SS-AD co-digestion of poultry manure and corn cob led to highest methane yields. • Thermal energy produced with CC-PM replaced half the energy spent with firewood. • Groot's multi-stage model best fitted the methane production data. Six typical Brazilian lignocellulosic biomasses (rice straw, corn cob, peanut shell, sawdust, coffee husk and sugarcane bagasse) were evaluated for methane production by solid-state anaerobic co-digestion with poultry manure. The results showed the highest methane production was obtained with corn cob and poultry manure (126.02 Nm3 CH 4. ton residue−1) using a food to inoculum ratio of 0.5, which lowered volatile fatty acids accumulation. In this condition, the thermal energy production (1.73 MJ.kg live chicken−1) would be able to replace 53.2% of the energy with firewood in poultry farming. The high hemicellulose and low lignin content in corn cob seem to explain the biomethanation of such biomass, and this agrees with the microbial analysis which revealed the predominance of bacteria related to plant polysaccharides hydrolysis and carbohydrate conversion in the inoculum. The methane production was best modelled by Groot's multi-stage model, and the microbial adaptation to lignin might explain this. [ABSTRACT FROM AUTHOR]