1. Performance and mechanism of various microaerobic pretreatments on anaerobic digestion of tobacco straw.
- Author
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Wang, Ligong, Jin, Wenxiong, Cai, Fanfan, Song, Chao, Jin, Yan, Liu, Guangqing, and Chen, Chang
- Subjects
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ANAEROBIC digestion , *STRAW , *TOBACCO , *TOBACCO smoke , *ACETIC acid , *METHANE as fuel , *LIGNOCELLULOSE , *MICROBIAL diversity - Abstract
[Display omitted] • Effects of various microaerobic pretreatments on AD of tobacco straw were studied. • Biogas slurry as pretreatment agent dosing 4 mL/g VS of O 2 (BS-4) performed better. • BS-4 had a good performance in the lignocellulosic decomposition of tobacco straw. • O 2 dosing in microbial pretreatment process could change the microbial diversity. Tobacco straw is an abundant biomass in China's agricultural ecosystems, and has high potential for methane production. However, the anaerobic digestion (AD) efficiency is limited by the recalcitrant lignocellulose structure of the tobacco straw. In this study, three microaerobic pretreatments were performed for the AD of tobacco straw to increase methane production. Among them, microbial pretreatment with biogas slurry at an oxygen concentration of 4 mL/g VS resulted in the highest methane production of 349.1 mL/g VS, increasing by 19.8 % than that of untreated. During this pretreatment, the relative abundances of Enterococcus and Clostridium sensu stricto 12 , which are closely related to acetic acid production and cellulose degradation, were high, and these bacteria might have an important contribution to substrate hydrolysis and the methanogenesis efficiency of the AD process. This study advances the understanding of microaerobic pretreatment processes and provides technological guidance for the efficient utilization of tobacco straw. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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