College of Agronomy/Center of Biomass Engineering, China Agricultural University, Beijing 100193, China.
Beijing Yingherui Environmental Technology Co., LTD, Beijing 102412, China.
Bioresour Technol. 2023 Dec;389:129804. doi: 10.1016/j.biortech.2023.129804. Epub 2023 Oct 5.
In China, the problem of low biogas yield of traditional biogas projects has become increasingly prominent. This study investigated the effects of different hydraulic retention times (HRTs) on the biogas production efficiency and microbial community under pilot conditions. The results show that the "Gradient anaerobic digestion reactor" can stably carry out semi-continuous dry anaerobic digestion and improve biogas yield. The highest volatile solids (VS) biogas yield (413.73 L/kg VS and 221.61 L CH/kg VS) and VS degradation rate (48.41%) were observed at an HRT of 25 days. When the HRT was 15 days, the volumetric biogas yield was the highest (2.73 L/L/d, 1.43 L CH/L/d), but the VS biogas yield and degradation rate were significantly decreased. Microbial analysis showed that HRT significantly affected microbial community. It provides basic data support for the development of a new anaerobic digestion process and the practical application of the straw biogas project in China.
在中国，传统沼气工程产气量低的问题日益突出。本研究在中试条件下，考察了不同水力停留时间（HRT）对沼气生产效率和微生物群落的影响。结果表明，“梯度厌氧消化反应器”可稳定进行半连续干法厌氧消化，提高沼气产量。在 HRT 为 25 天时，挥发性固体（VS）沼气产量（413.73 L/kg VS 和 221.61 L CH/kg VS）和 VS 降解率（48.41%）最高。当 HRT 为 15 天时，体积产气量最高（2.73 L/L/d，1.43 L CH/L/d），但 VS 沼气产量和降解率显著降低。微生物分析表明，HRT 对微生物群落有显著影响。为新型厌氧消化工艺的开发和中国秸秆沼气工程的实际应用提供了基础数据支持。
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