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

Jie Liu, Ruixia Shen, Zonglu Yao, Jing Feng, Jiadong Yu, Juan Luo and Lixin Zhao

Energy, 2025, vol. 333, issue C

Abstract: 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 °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·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·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.

Keywords: Agricultural waste; Biochar; Fermentation; Activation; Biogas production (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:333:y:2025:i:c:s0360544225030403

DOI: 10.1016/j.energy.2025.137398

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