Effect of different organic loads on the performance and microbial community mechanism of dry anaerobic digestion

文献类型： 外文期刊

第一作者： Zhen, Feng

作者： Zhen, Feng;Sun, Yongming;Li, Lianhua;Li, Ying;Xing, Tao;Zhen, Feng;Li, Lianhua;Li, Ying;Xing, Tao;Wu, Di;Qu, Bin;Li, Qichen

作者机构：

关键词： Corn straw; Dry anaerobic digestion; Microbial community; Methane metabolic pathways

期刊名称：FUEL （ 影响因子：7.4； 五年影响因子：7.0 ）

ISSN： 0016-2361

年卷期： 2024 年 361 卷

页码：

收录情况： SCI

摘要： In this study, the vertical continuous push-flow dry anaerobic digestion (AD) reactor was developed independently. Typical agricultural organic waste straw and cow dung were used as raw materials in this paper to carry out long-term continuous mixed dry AD experiments on a controlled laboratory scale. The experimental results showed that the system was in low-stress operation at an organic load rate (OLR) of 3 g VS L-1 d(-1), the VS methane production rate was located at 225 similar to 272 mL CH4 g VS-1, and the volumetric methane production rate was located at 0.95 +/- 0.08 L (Ld)(-1), and the combination of the volumetric methane production rate, VS methane production rate, methane content of the gas, and the VS removal rate showed that the system's operational performance in this stage was in the best condition in the whole set of experiments. When the OLR reached 25 g VS L-1 d(-1), the content of VFAs all began to climb rapidly above 8000 mg/L, with the content of acetic acid increasing most significantly due to the fact that the activity of acetic acid-type methanogenic bacteria was the first to be inhibited. Eventually, because of the kinetic differences between the hydrolytic acidifying bacteria and the methanogenic archaea, the final acidification destabilisation of the anaerobic digestion reactor occurred and the system was irreversibly destabilised. The system performance at this stage was in the best condition in the whole set of experiments. The study of microbial community succession and metabolic mechanisms showed that Methanoculleus and Methanobacterium play a key role in sustaining methane production, and the increased abundance and dominance of hydrogen methanogens implies that methane is produced via the hydrogen methanogenic pathway under high organic loading conditions.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序