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There has been growing interest in using anaerobic digestion to treat lignocellulosic biomass, and in the meantime, generate biogas for energy production. However, current design of either liquid or solid anaerobic digestion has met with considerable challenges and usually requires pretreatment of feedstock. This study worked on a new cartridge design anaerobic digestion system to treat lignocellulosic biomass. In this 13-month test, corn stover was employed as the feedstock, and the system was operated in three conditions: 1. Three cartridges in the digester and each cartridge was rotated every seven days; 2. four cartridges in the digester and each cartridge was rotated every seven days, and 3. four cartridges in the digester and each cartridge was rotated every 9-10 days. The biogas production was stable in all three conditions and the average methane yield was 7.57, 7.11, and 6.90 L/day/kg-VS from conditions 1, 2, and 3, respectively, which was comparable to other digester designs. However, no floating problem, only minimal liquid waste was generated from this system, and the daily biogas/methane yield was stable. Also, due to the microaeration effect, the H2S concentration in the biogas was kept at a relatively low level, with averages of 60.48, 110.31, and 52.79 ppm from the conditions 1, 2, and 3 respectively. The study demonstrated the feasibility of using this new design for biogas production from lignocellulosic biomass and also provided a baseline for system optimization.
Moran, Trevar, "Comparison of Biogas Production Using Different Digester Operational Strategies" (2020). Health Sciences. 3.