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Anaerobic Digestion of Dairy Manure in a Fixed Bed CSTR: Methane Production Performance and Microbial Diversity

文献类型： 外文期刊

作者： Wang, Haipeng 1 ; Zhao, Yiquan 1 ; Yang, Anyi 1 ; Yan, Lei 1 ; Lim, Teng Teeh 3 ; Zhao, Hongyan 4 ; Gu, Ji-Dong 5 ; Wei, 1 ;

作者机构： 1.Heilongjiang Bayi Agr Univ, Heilongjiang Prov Key Lab Environm Microbiol & Re, Daqing 163319, Heilongjiang, Peoples R China

2.Minist Educ, Engn Res Ctr Proc & Utilizat Grain By Prod, Daqing 163319, Heilongjiang, Peoples R China

3.Univ Missouri, Div Food Syst & Bioengn, Agr Syst Management, Columbia, MO 65211 USA

4.Yanbian Univ, Coll Agron, Yanji 133002, Jilin, Peoples R China

5.Guangdong Technion Israel Inst Technol, 241 Daxue Rd, Shantou 515000, Guangdong, Peoples R China

6.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr & Resources, Beijing 100000, Peoples R China

关键词： Fixed bed; Methane; Biofilm; Microbial diversity; Dairy manure; Biotechnology

期刊名称：BIORESOURCES （ 影响因子：1.614； 五年影响因子：1.923 ）

ISSN： 1930-2126

年卷期： 2020 年 15 卷 4 期

页码：

收录情况： SCI

摘要： To improve the fixed bed and continuous stirred-tank reactor (CSTR) technology relative to the rate of treatment of dairy manure (DM), a continuous stirred tank-treated DM with immobilized carrier biofilm was investigated for 20 days (hydraulic retention time (HRT) was 10 d). Methane productivity, biofilm characteristics, and microbial diversities of the biofilm and digestate were measured. The highest content of extracellular polymeric substances (EPS), proteins, and polysaccharides occurred at 15 days of digestion. An agglomeration phenomenon was observed using a scanning electron microscope on the biofilm. This indicated that the biofilm consisting of EPS was stable during the second HRT. Microbial diversities in digestate and carrier biofilm were characterized using a 16S rRNA sequencing technique. Results showed that the dominant bacterial communities were Pseudomonas (17% to 26%), Clostridium (13% to 21%), and Bacteroidetes (7% to 16%), while the archaea communities were Methanocorpusculum (25% to 37%), Methanosarcina (15% to 33%), Methanoculleus (11% to 15%), and Methanosaeta (13% to 18%). The methane production rate was significantly correlated with bacterial communities (Pseudomonas, Clostridium, Altererythrobacter atlanticus), archaeal communities (Methanosarcina, Methanoculleus, Methanosaeta, and Methanoplanus), and biofilm characteristics (chemical oxygen demand (COD) and EPS). These findings showed that a carrier biofilm could efficiently increase methane production.

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