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| Effect and the mechanism of hydrochars on methane production of cornstalk digestion |
| GENG Tao, ZHAO Li-xin, YAO Zong-lu, SHEN Rui-xia, YU Jia-dong, LUO Juan |
| Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences;Key Laboratory of Low-carbon Green Agriculture in North China, Ministry of Agriculture and Rural Affairs P. R. China, Beijing 100081, China |
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Abstract In this study, different types of hydrochars were prepared from corn straw and cotton straw at different temperatures to clarify the effects of preparation conditions such as temperature, materials on its physicochemical properties and the promotion effects of hydrochars addition on corn straw anaerobic digestion were explored further. The results showed that the carbonization degree of corn straw was higher than that of cotton straw at the same preparation temperature. The oxygen-containing functional groups of hydrochars such as O-H and C-O were decreased when the reaction temperature was elevated but it was conducive to the improvement of carbonization degree, the construction of surface pore structure and the microsphere morphology at the higher temperature. The hydrochars were added to the corn straw anaerobic digestion system, and the corn straw hydrochar prepared at 180℃ had the most significant promotion effect which increasing the cumulative methane production and the maximum methane production rate by 13.74% and 12.06%, respectively. Meanwhile, it contributed to the degradation of VFA and stabilized the variance of pH in the anaerobic digestion system. Microbial analysis showed the acidobacterium such as Firmicutes and Synergistota as well as hydrogenotrophic methanogenesis such as Methanosarcina and Methanospirillum were enriched to accelerate the methane production. It may be related to the abundant oxygen-containing group of hydrochar.
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Received: 08 January 2024
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Corresponding Authors:
赵立欣,研究员,zhaolixincaae@163.com
E-mail: zhaolixincaae@163.com
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