Spatial succession and metabolic properties of functional microbial communities in an anaerobic baffled reactor |
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| Institution: | 1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang Province, China;2. Taizhou Institute of Science and Technology, Nanjing University of Science and Technology, Taizhou 225300, Jiangsu Province, China;3. Province Key Laboratory of Environmental Material and Environmental Engineering, Yangzhou University, Yangzhou 225000, Jiangsu Province, China;4. Province Key Laboratory of Environmental Engineering, Jiangsu Environmental Science Research Institute, Nanjing 225000, Jiangsu Province, China;5. Guangzhou Jiajing Water Treatment Engineering & Technology Co. Ltd, Guangzhou 510640, Guangdong Province, China;1. Division of Cardiology, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina;2. Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland;3. Department of Pathology, Johns Hopkins Hospital, Baltimore, Maryland |
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| Abstract: | The spatial successions of bacterial and archaeal communities in anaerobic digestion were investigated in a glucose-degrading five-compartment anaerobic baffled reactor (ABR). The distributions of H2-producing acetogens, H2-utilizing acetogens and methanogens in different anaerobic-digestion stages were quantitatively analyzed using functional probes. The results show that the acidogenesis stage and acetogenesis stage were located in the first two compartments, while the methanogenesis were located in the last two compartments. In acidogenesis/acetogenesis stage of anaerobic digestion, H2-producing acetogens (19.7%) and H2-utilizing acetogens (8.3%) were the dominant bacterial community. While in methanogenesis stage, methanogens became the dominant (40.2%) with H2-producing acetogens and H2-utilizing acetogens only accounting for 6.6% and 4.8%, respectively. With the bacterial population decreasing from 7.2 ± 0.5 × 1012 cells mL−1 to 0.6 ± 0.3 × 1012 cells mL−1 along water flowing direction, their diversity increased from 2.79 to 299. The acidogenic bacteria, such as Lactococcus sp., Uncultured Firmicutes bacterium, and Uncultured Clostridium sp., etc., dominated in the acidogenesis/acetogenesis stage, while Uncultured Desulfobacterales bacterium became dominant in the methanogenesis stage. A two-stage anaerobic process may be suitable for easily degradable organic matters removal. |
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