Anaerobic digestion of tobacco stalk: biomethane production performance and kinetic analysis
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Tobacco stalk, a common agricultural waste derived from the harvest of tobacco, caused serious environmental pollution in China. In this study, the performance of biomethane production and characteristics of four varieties of tobacco stalk were investigated for the first time. The results showed that the highest cumulative methane yield of 130.2 mL/g-VS was obtained from Nicotiana tabacum L., Yunyan114, which had lower lignin content than other varieties of tobacco stalk. Moreover, different kinetic models were used to describe the biomethane production process, and it was found that the modified Gompertz model was more suitable to simulate the anaerobic digestion (AD) of tobacco stalk. The findings of this study not only showed a feasible method for minimizing the pollution issues of tobacco stalk waste but also gave fundamental information for future AD application.
KeywordsTobacco stalk Anaerobic digestion Methane production Organic loading Kinetic analysis
Carbon to nitrogen ratio
Cumulative methane yield
Experimental methane yield
Feedstock to inoculum radio
Total ammonia nitrogen
Theoretical methane yield
Volatile fatty acids
Simulated cumulative methane yield (mL/g-VS)
Simulated maximum cumulative methane yield (mL/g-VS)
Molar gas volume under standard temperature and pressure (22.4 L/mol)
Ideal gas constant (8.314 J/K/mol)
Absolute temperature (K)
Biogas volume (L)
Headspace volume (L)
Hydrolysis rate constant (day−1)
Dimensionless shape factor
Digestion time (day)
Absolute pressure difference (kPa)
Lag phase time (day)
Maximum methane production rate (mL/g-VS/day)
Students would like to thank the support given by Talent Training and Teaching Reform Project from Beijing Municipal Education Commission, “One Belt, One Road” National Talent Training Project of Beijing, China, Teaching Reform Program for “New Engineering” Research and Practice (xgk2017040117), and Foreign Cooperation Education Teaching Reform Project, Beijing University of Chemical Technology.
This research was funded by the National Key Research and Development Program of China (2017YFD0800801).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.