1. Bio-H2 production enhancement from the NaOH-urine pretreated rice straw: The holocellulose retention yield promotion.
- Author
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Dong, Lili, Luo, Geng, Wang, Yu-Hao, Wang, Wan-Qing, Cao, Guang-Li, Yang, Shan-Shan, and Yang, Fei
- Subjects
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RICE straw , *ANAEROBIC digestion , *ENERGY conversion , *ENERGY consumption , *POTENTIAL energy , *LIGNOCELLULOSE - Abstract
The primary objective of this study was to assess the feasibility of utilizing urine-prepared NaOH solution (NUr) as an innovative pretreatment approach for enhancing BHP in rice straw through anaerobic digestion (AD) process. The findings suggest that pretreatment with NUr could substantially enhance hydrolysis rates and H 2 production. The maximum biohydrogen production (BHP) yield reached 184.46 mL/g substrate with 86.98 % holocellulose retention yield and 59.84 % removal of lignin when RS was pretreated by NUr at a concentration of 3 % w/v, 20 % solid loading, −12 °C, and 3 months. Macro and microstructure analysis confirmed more cellulose and hemicellulose were exposed due to the lignin removed, and crystallinity decreased after NUr pretreatment. The energy conversion efficiency (ECE) attained via NUr pretreated RS was 10.38 %, exceeded that of raw RS by 62.19 %. These findings offer a promising and efficient pretreatment technology for enhancing the recovery of H 2 from lignocellulosic biomass, yielding both environmental and economic advantages. [Display omitted] • The maximum bio-H 2 production from RS reached 184.46 mL/g substrate by NUr pretreatment. • NUr pretreatment could achieve 86.98 % holocellulose retention and 59.84 % removal of lignin. • NUr pretreatment improves the biohydrogen potential (B 0) of RS by 91.86 %. • NUr pretreatment improves hydrolysis rate (k) of RS by 37.04 %. • Material balance and ECE analysis suggested NUr is an attractive pretreatment method. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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