Dry anaerobic digestion in batch mode: Design and operation of a laboratory-scale,completely mixed reactor |
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| Authors: | J Guendouz P Buffière J Cacho M Carrère J-P Delgenes |
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| Institution: | 1. Centre de Recherche sur la Propreté (VEOLIA), Zone Portuaire de Limay, 291 Avenue Dreyfous Ducas, Limay, F-78250, France;2. Université de Lyon, INSA-Lyon, Laboratoire de Génie Civil et d’Ingénierie Environnementale, 9 rue de la Physique, F-69621, Villeurbanne cedex, France;3. INRA, UR50, Laboratoire de Biotechnologie de l’Environnement, Avenue des Etangs, Narbonne, F-11100, France;1. School of Civil, Environmental and Chemical Engineering, RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;2. Land and Water Flagship, Commonwealth Scientific and Industrial Research Organisation (CSIRO), PO Box 56, Highett, VIC 3190, Australia;3. Melbourne Water, PO Box 4342, Melbourne, VIC 3001, Australia;1. Water Affairs Research Institute, North China University of Water Resources and Electric Power, 36 Beihuan Road, Zhengzhou 450045, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing 100049, China;3. State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, No.1 West Beichen Road, Beijing 100101, China;1. Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cádiz, Spain;2. Department of Chemistry and Soil Science, Faculty of Science, University of Navarra, Spain;3. Department of Environmental Technology, Faculty of Sea and Environment Sciences, University of Cádiz, Spain |
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| Abstract: | A laboratory-scale (40 l) reactor was designed to investigate dry anaerobic digestion. The reactor is equipped with an intermittent paddle mixer, enabling complete mixing in the reactor. Three consecutive batch dry digestion tests of municipal solid waste were performed under mesophilic conditions and compared to operation results obtained on a pilot-scale (21 m3) with the same feedstock. Biogas and methane production at the end of the tests were similar (around 200 m3 CH4STP/tVS), and the dynamics of methane production and VFA accumulation concurred. However, the maximal levels of VFA transitory accumulation varied between reactors and between runs in a same reactor. Ammonia levels were similar in both reactors. These results show that the new reactor accurately imitates the conditions found in larger ones. Adaptation of micro-organisms to the waste and operating conditions was also pointed out along the consecutive batches. |
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