Simultaneous carbon dioxide reduction and enhancement of methane production in biogas via anaerobic digestion of cornstalk in continuous stirred-tank reactors: The influences of biochar, environmental parameters, and microorganisms

文献类型： 外文期刊

第一作者： Shen, Ruixia

作者： Shen, Ruixia;Jing, Yong;Feng, Jing;Yu, Jiadong;Chen, Jiankun;Chen, Runlu;Zhao, Lixin;Yao, Zonglu

作者机构：

关键词： Cottonwood biochar; CO2 reduction; CH4 enhancement; Microbial community

期刊名称：BIORESOURCE TECHNOLOGY （ 影响因子：9.642； 五年影响因子：9.237 ）

ISSN： 0960-8524

年卷期： 2021 年 319 卷

页码：

收录情况： SCI

摘要： The composition of biogas produced by anaerobic digestion (AD) is typically not ideal due to high CO2 content. In the study, cottonwood biochar was used as an enhanced mediator for the continuously stirred tank reactor AD of cornstalk. The effects of substrate loading and biochar dosage on biogas composition, volatile fatty acids (VFAs), NH3-N, and microbial community characteristics were systematically explored. The results showed that the highest volumetric biogas production rate with biochar was 1.40 L/L/d, at the same time, the CO2 content in the biogas decreased by 5.90%, while the CH4 content increased by 7.40%, compared with the values in AD without biochar. Moreover, VFAs were degraded effectively, in particular, the propionic acid concentration decreased by 55.7%. Besides, microbial abundance had positive correlations with environmental parameters. This study could provide valuable information for both the elucidation of strengthening mechanisms of biochar and further large-scale engineering application.

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