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Unveiling the synergy of volatile fatty acids and ammonia nitrogen in optimizing methane production during dry anaerobic digestion of pig manure and corn straw

文献类型： 外文期刊

作者： Li, Zhuowu 1 ; Li, Danni 2 ; Cheng, Shenwei 1 ; Ma, Yingjun 1 ; Liu, Fuyuan 1 ; Gao, Xingliang 3 ; Zhang, Keqiang 1 ; Liu, Rui 5 ; Yang, Jingquan 3 ; Du, Lianzhu 1 ;

作者机构： 1.Minist Agr & Rural Affairs, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China

2.East China Univ Sci & Technol, Shanghai 200237, Peoples R China

3.Xinjiang Acad Agr & Reclamat Sci, State Key Lab Sheep Genet Improvement & Hlth Prod, 221 Wuyi Rd, Shihezi, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Low Carbon Green Agr North China, Beijing 100193, Peoples R China

5.Yunnan Univ, Inst Ecol Res & Pollut Control Plateau Lakes, Sch Ecol & Environm Sci, Kunming 650500, Peoples R China

关键词： Methane production; Synergistic effect; Correlation analysis; Microbial dynamics; Metabolic pathway

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.3； 五年影响因子：13.2 ）

ISSN： 1385-8947

年卷期： 2024 年 496 卷

页码：

收录情况： SCI

摘要： Dry anaerobic digestion (AD) is vulnerable to volatile fatty acids (VFA) and ammonia nitrogen. Understanding their synergy is crucial for optimizing strategies. In this study, the digestive performance, microbial dynamics, metabolic pathways, and synergistic relationships were investigated in the dry AD process by adding different concentrations of acetic acid (2, 5, and 8 mg/g) and urea (1, 5 mg/g N). Results showed that acid inhibition was caused by excessive pH reduction due to VFA accumulation. Propionic acid was the primary form of VFA accumulation. The inhibition of VFA accumulation could be alleviated using a low concentration of ammonia nitrogen (1 mg/g N urea) or be strengthened using a high concentration of ammonia nitrogen (5 mg/g N urea). Compared with the control group (82.2 mL/g VS), VFA and 1 mg/g N urea had a synergistic facilitation effect on the methane production (increasing by 1.7 %-18.1 %). This synergistic effect shortened the lag phases, enhanced the activity of Caldicoprobacter and Methanosarcina, increased the expression of genes encoding functional enzymes involved in the acetoclastic-methanogenic pathway. By contrast, VFA and 5 mg/g N urea had a synergistic inhibition effect on methane production (decreasing by 65.7 %-69.8 %). This synergistic effect prolonged lag phases, increased the relative abundance of ammonia-tolerant and acid-tolerant microbial (such as Methanoculleus) and reduced the expression of genes encoding functional enzymes involved in the hydrogenotrophicmethanogenic pathway. These results improve the understanding of methane regulation during dry AD.

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