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Methane production by co-digestion of poultry manure and lignocellulosic biomass: Kinetic and energy assessment

2019; Elsevier BV; Volume: 300; Linguagem: Inglês

10.1016/j.biortech.2019.122588

1873-2976

Aline Gomes de Oliveira Paranhos, Oscar Fernando Herrera Adarme, Gabriela Fernandes Barreto, Silvana de Queiroz Silva, Sérgio Francisco de Aquino,

Agriculture Sustainability and Environmental Impact

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 CH4. 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.