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Tolerance potential of straw anaerobic digestion for organic load rate: reinforced by activated hydrochar with water vapour at high-temperature

文献类型： 外文期刊

作者： Liu, Jie 1 ; Shen, Ruixia 1 ; Yao, Zonglu 1 ; Feng, Jing 1 ; Yu, Jiadong 1 ; Luo, Juan 1 ; Zhao, Lixin 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Agr Green & Low Carbon North China Plain, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China

关键词： Agricultural waste; Biochar; Fermentation; Activation; Biogas production

期刊名称：ENERGY （ 影响因子：9.4； 五年影响因子：8.8 ）

ISSN： 0360-5442

年卷期： 2025 年 333 卷

页码：

收录情况： SCI

摘要： Anaerobic digestion (AD) is one of the main means for the efficient utilization of crop straw resources. However, there were some bottlenecks such as limited organic load rate (OLR), low biogas production, poor stability, etc. To enhance the AD performances, in this study, corn stover hydrochar, which was activated with water vapour at high-temperature of 900 degrees C, was used to enhance a continuous AD fed with corn stover. The results showed that the maximum volumetric gas production rate of AD with hydrochar was 1.12 L/(L center dot d), which was 64.70 % higher than that of the control group. Accordingly, the maximum methane content was 64.97 %. When the OLR reached 4.36 g TS/(L center dot d), the pH of AD system with hydrochar remained at 5.98, in comparison, the control group exhibited acid inhibition with the pH of 4.79 and biogas production ceased. The accumulation of propionic acid significantly increased the abundance of Olsenella and Caproiciproducens. Methanosarcina showed a significant positive correlation with both hydrochar addition and OLR, but Prevotella_7 showed a significant negative correlation with Methanosaeta. This study could provide a theoretical basis for the hydrochar application in AD.

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