Trophic link between syntrophic acetogens and homoacetogens during the anaerobic acidogenic fermentation of sewage sludge |
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| Institution: | 1. Laboratory of Environmental Biotechnology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, People''s Republic of China;2. School of Environmental and Safety Engineering, Changzhou University, Changzhou 213164, People''s Republic of China;3. Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, People''s Republic of China;1. Molecular Biotechnology Laboratory, Department of Chemical & Biomolecular Engineering, & the Delaware Biotechnology Institute, University of Delaware, Newark, DE 19711, USA;2. Elcriton, Inc., 15 Reads Way, New Castle, DE 19720, USA;1. Department of Chemical & Biochemical Eng., Western University, London, ON, N6A 5B9, Canada;2. Trojan Technologies, London, ON, N5V 4T7, Canada;3. Advanced Water Management Centre, The University of Queensland, Brisbane, QLD, 4072, Australia;1. School of Environmental and Civil Engineering, Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China;2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215011, China;3. Civil Engineering, College of Engineering and Informatics, National University of Ireland, Galway, Ireland |
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| Abstract: | Acetate production during anaerobic sludge treatment has significant economic and environmental benefits. In this study, trophic links between syntrophic acetogens and homoacetogens in the anaerobic acidogenic fermentation of sewage sludge were investigated using methanogenic inhibitor 2-bromoethanesulfonate (BES) to block the methanogenesis pathway and butyrate to enhance syntrophic acetogenesis. The Gibbs free energies (ΔG) of the butyrate-degrading and homoacetogenic processes were close to the thermodynamic threshold of the reaction activity (?15 kJ/mol). In addition, microbial quantification analysis revealed that the growth of syntrophic acetogenic bacteria and homoacetogens in the treatment incubations was higher than that of the control. The results indicated that hydrogen-producing butyrate degraders are stimulated with homoacetogens when methanogenesis was specifically inhibited. |
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