期刊
BIORESOURCE TECHNOLOGY
卷 288, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121581
关键词
Anaerobic digestion; Hydraulic retention time; Microbial dynamic; Hyperthermophilic biological hydrolysis; Methanogenic performance
资金
- National Key Research and Development Program of China [2016YFD0501403]
- Beijing Natural Science Foundation [6182017]
- State Administration of Foreign Experts Affairs P.R. China [WQ20180011]
Hyperthermophilic biological hydrolysis of sewage sludge was applied before long-term anaerobic digestion to investigate how shortening hydraulic retention times (HRT, 20-5d) affected methanogenic performances and microbial dynamics. Results indicated that although the three different HRTs provided a stable process with a steady-state of methane production, both methane yield (161 L kg-VSin,(-1) 25% higher) and volatile solids removal (VS, 50%, 2-fold higher) increased during longer HRTs. Redundancy analysis results indicated that Sporosarcina and Methnosarcina positively correlated to VS removal and methane yield, and negatively correlated to volatile fatty acids (VFAs) accumulation. The relative abundance of Coprothermobacter ( > 60%), syntrophic acetate oxidation bacteria (SAOB), and Methanospirillum (8-15%), increased during shorter HRTs. A slight shift to two-stage acetate conversion was observed during shorter HRTs. The results demonstrated that HRTs played a key role in shaping microbial structure, leading to a new steady-state of microbial community profiles and process performances at variable HRTs.
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