期刊
BIORESOURCE TECHNOLOGY
卷 269, 期 -, 页码 276-284出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.08.096
关键词
Beta-oxidation; 16S rRNA; Biogas; CSTR; Stability; Methane
资金
- Research Council of Norway through the project BiogasFuel [228747]
- Research Council of Norway through the project CenBio [212701]
- Research Council of Norway through the project Bio4Fuel [257622]
In anaerobic digestion, studies of feeding frequency have produced conflicting results. Hence, the effect of feeding frequency on process variables and microbial community structure was investigated by comparing a laboratory-scale digester fed steam exploded food waste 10 times daily vs. one fed an equivalent amount once daily. The Frequently Fed Digester (FFD) produced on average 20% more methane and had lower effluent concentrations of long-chain fatty acids. Greater daily fluctuations in acetate, pH and biogas production rate could explain the lower specific methane yield and beta-oxidation. Feeding frequency also influenced the microbial community whereby Tenericutes (42%) dominated in FFD but Firmicutes (31%) was most abundant in the Daily Fed Digester (DFD). Feeding frequency effects are therefore postulated to occur more often in digesters fed labile feedstocks at high organic loading rates.
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