Anaerobic digestion of rice straw pretreatment liquor without detoxification for continuous biogas production using a 100 L internal circulation reactor

作者：Li, Hailon; Wang, Can; Chen, Xuefang; Xiong, Lian; Guo, Haijun; Yao, Shimiao; Wang, Mengkun; Chen, Xinde^*; Huang, Chao^*

来源：JOURNAL OF CLEANER PRODUCTION, 2022, 349: 131450.

DOI：10.1016/j.jclepro.2022.131450

• Anaerobic digestion
• Rice straw
• Biogas production
• Pretreatment liquor
• IC reactor

The production of biogas from lignocellulose by anaerobic digestion (AD) has attracted much attention recently. However, the over-acidification phenomenon and low biogas yield often occur during the AD of lignocellulose. In this work, the liquid-state fermentation mode using pretreatment liquor from dilute acid treated rice straw without detoxification for continuous biogas production in a 100 L internal circulation reactor was studied. The highest biogas yield reached 0.66 m(3)/kg CODconsumption while the methane yield was 0.38 m(3)/kg CODconsumption. The pH values of outlet were maintained at 6.9-7.4, and even the inlet pH values were lower than 6.0. Furthermore, from the second day to the end of fermentation, the COD removal rates were more than 90%, even though the inlet COD was close to 20000 mg/L. The organic substances from acid pretreated rice straw were efficiently degraded by AD, which was confirmed by substrate metabolism analysis. These results indicated that the whole fermentation process of AD was very stable and showed great potential for industrial application.

• 单位
  中国科学院; 广东药学院; 中国科学院广州能源研究所