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| Performance and microbiological analysis of gas production from anaerobic co-digestion of food waste，pig manure and corn straw |
| Received:October 29, 2024 |
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| KeyWord:food waste;pig manure;corn straw;material compounding;anaerobic co-digestion |
| Author Name | Affiliation | E-mail | | LIU Yiming | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Xue | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DING Yongzhen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | dingyongzhen@caas.cn | | CHEN Zhimin | Luotian Agriculture Technology Promotion Centre, Hubei Province, Luotian 438600, China | | | ZHAN Dong | Macheng Agriculture Technology Promotion Centre, Hubei Province, Macheng 438300, China | | | ZHAO Ran | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | MU Xiaoquan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | HUANG Chengcheng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | YANG Fengxia | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | yangfengxiacomeon@163.com |
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| Abstract: |
| Anaerobic digestion is one of the main modes of treatment and utilisation of organic waste in rural areas, and in order to further improve the utilisation of organic waste and the efficiency of anaerobic digestion. In this study, we investigated the effects of different mixture ratios on the process and efficiency of anaerobic digestion through the compounding of food waste, pig manure and corn stover, measured the biogas production, methane content, organic matter degradation and other indexes, analysed the structure and function of microbial communities, and analysed the synergistic / antagonistic roles of microorganisms and their intrinsic links in the anaerobic codigestion system. The results showed that compared with single-substrate anaerobic digestion, double-substrate anaerobic digestion could accelerate the hydrolysis of acid production in the early stage of the reaction, and the methane yield was increased by 18.46%~62.80%; the methane production effect of triple-substrate anaerobic co-digestion was not significant compared with that of double-substrate digestion system; however, the stable pH and the low concentration of volatile fatty acids in the triple-substrate digestion system made its stability and buffering performance superior to that of single-substrate and double-substrate digestion systems. The relative abundance of the acetate-type methanogenic bacterium Methanosaeta was significantly higher in the two- and three-substrate anaerobic co-digestion systems than in the single-substrate system and was synergistically related to most of the genera. Therefore, the highest methane production （372.29 mL·g-1）was observed in a 1∶1 mixture of pig manure and straw, and Chloroflexi in the three-substrate anaerobic co-digestion system of food waste, pig manure, and straw showed a significant positively correlated with Desulfobacterota, Methanosaeta, Methanobacterium and Halobacterota, which could synergistically promote the decomposition of organic matter and provide nutrients for methanogenic bacteria growth and metabolism. |
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