Effect of substrate feeding frequencies on the methane production and microbial communities of laboratory-scale anaerobic digestion reactors

被引:10
作者
Piao, Zheng Hua [1 ]
Lee, Jongkeun [1 ]
Kim, Jae Young [1 ]
机构
[1] Seoul Natl Univ, Coll Engn, Dept Civil & Environm Engn, 1 Gwanak Ro, Seoul 08826, South Korea
基金
新加坡国家研究基金会;
关键词
Anaerobic digestion; Substrate feeding frequency; Stability; Methane production; Microbial community; ARCHAEAL COMMUNITIES; MOLECULAR ANALYSIS; SLUDGE DIGESTER; CHICKEN MANURE; CO-DIGESTION; FOOD WASTE; BACTERIAL; SEQUENCE; TEMPERATURE; INHIBITION;
D O I
10.1007/s10163-016-0556-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Even though full-scale digesters have been designed based on laboratory-scale tests, the substrate feeding modes of laboratory-scale tests might be different from those of full-scale digesters. The effect of substrate feeding frequencies on the performance and microbial community of laboratory-scale anaerobic digestion reactors was investigated. Feeding frequencies of twice a day, once a day, and every two days were tested in three 2-L reactors with an organic loading rate of 0.5 g-glucose/L/day under mesophilic condition. According to the results of this study, all the reactors showed similar methane production rates and SCOD removal efficiencies after sufficient time of acclimation, but frequently feeding promoted more stable digestion. Although there was no significant difference in microbial diversities from pyrosequencing analyses, the changes of archaeal community composition were observed. The decrease in feeding frequency appeared to cause shifts from acetoclastic methanogens affiliated with Methanosaeta to H-2-utilizing methanogens. The increase of Methanosaeta at a frequently feeding might contribute to the stability of reactor operation. Since this study uses glucose as the substrate, there is still possibility of different results for more complex substrates, such as sludge, food waste, etc.
引用
收藏
页码:147 / 154
页数:8
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