Methanogenic community dynamics in anaerobic co-digestion of fruit and vegetable waste and food waste

• Published in: Journal of environmental sciences (China) 2012-07, Vol.24 (7), p.1288-1294
• Main Author: Jia Lin, Jiane Zuo Ruofan Ji Xiaojie Chen Fenglin Liu Kaijun Wang Yunfeng Yang
• Format: Article
• Language: English
• Subjects: anaerobic co-digestion; anaerobic digestion; Anaerobiosis; Archaea; Archaea - genetics; Archaea - metabolism; Bioreactors; community structure; Denaturing Gradient Gel Electrophoresis; denaturing gradient gel electrophoresis (DGGE); environmental factors; food waste; Garbage; high-solid organic waste; metabolites; Methane - metabolism; methane production; Methanoculleus; methanogenic community structure; methanogens; Methanosaeta; Methanosarcina; microbial communities; Microbial Consortia; Multivariate Analysis; PCR-DGGE; Polymerase Chain Reaction; redundancy analysis (RDA); vegetables; 产甲烷菌; 厌氧消化; 变性梯度凝胶电泳; 水果; 混合比例; 蔬菜废物; 连续搅拌釜式反应器
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(11)60927-3

A lab-scale continuously-stirred tank reactor （CSTR）, used for anaerobic co-digestion of fruit and vegetable waste （FVW） and food waste （FW） at different mixture ratios, was operated for 178 days at the organic loading rate of 3 kg VS （volatile solids）/（m3.day）. The dynamics of the Archaeal community and the correlations between environmental variables and methanogenic community structure were analyzed by polymerase chain reactions - denaturing gradient gel electrophoresis （PCR-DGGE） and redundancy analysis （RDA）, respectively. PCR-DGGE results demonstrated that the mixture ratio of FVW to FW altered the community composition of Archaea. As the FVW]FW ratio increased, Methanoculleus, Methanosaeta and Methanosarcina became the predominant methanogens in the community. Redundancy analysis results indicated that the shift of the methanogenic community was significantly correlated with the composition of acidogenic products and methane production yield. Different mixture ratios of substrates led to different compositions of intermediate metabolites, which may affect the methanogenic community. These results suggested that the analysis of microbial communities could be used to diagnose anaerobic processes.