The impact of feed composition on biodegradation of benzoate under cyclic (aerobic/anoxic) conditions |
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| Authors: | Cinar Ozer |
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| Affiliation: | 1. Department of Chemistry, University of Rome “La Sapienza”, P.le Aldo Moro 5, Rome 00185, Italy;2. Water Research Institute, National Research Council (IRSA-CNR), Via Reno 1, Rome 00198, Italy;1. Centro de Investigación y Desarrollo en Tecnologı́a de Pinturas, CIC-CONICET, Postal Code 1900, La Plata, Argentina;2. Laboratorio de Electroquı́mica Fundamental, Facultad de Ciencias, Universidad de la República, Libertad No. 2497, Postal Code 11300, Montevideo, Uruguay;1. Department of Civil Engineering, Indian Institute of Technology, Guwahati, Assam 781039, India;2. Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India;1. UMR IDES 8148, Université Paris Sud XI, bât. 504, F-91405 Orsay, France;2. Laboratoire des Interactions Micro-organismes-Minéraux-Matière Organique dans les Sols (LiMos), UMR 7137 CNRS-UHP Faculté des sciences, BP 239, F-54506 Vandoeuvre-lès-Nancy, France;3. Norwegian Forest Research Institute, Høgskoleveien 12, N-1432 Ås, Norway;4. CRPG – Service d''Analyses des Roches et Minéraux du CNRS, Unité de Géochimie Organique, BP 20, F-54501 Vandoeuvre-lès-Nancy, France;1. Department of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal;2. Department of Chemical Engineering, Faculty of Sciences, University of Valladolid. Paseo Prado de la Magdalena s/n, 47005 Valladolid, Spain;1. Department of Science and Technology, University of Verona, Strada Le Grazie, 15. I-37134 Verona, Italy;2. Institute of Hydraulics and Transportation Infrastructures, Polytechnic University of Marche, via Brecce Bianche. I-60100 Ancona, Italy |
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| Abstract: | The response of a mixed microbial culture to different feed compositions, that is, containing benzoate and pyruvate as sole carbon sources at different levels, was studied in a chemostat with a 48-h hydraulic residence time under cyclic aerobic and anoxic (denitrifying) conditions. The cyclic bacterial culture was well adapted to different feed compositions as evidenced by the lack of accumulation of benzoate or pyruvate in the chemostat. Both the benzoate-degrading capabilities and the in vitro catechol 2,3-dioxygenase (C23DO) activities of the cyclic bacterial cultures were in direct proportion to the flux through the chemostat of the substrate degraded by the pathway containing C23DO, with some exceptions. The quantity of C23DO showed a transient decrease during the initial portion of the aerobic period before returning to the level present during the anoxic period. That decrease was most likely caused by the production of H(2)O(2) by the cells upon being returned to aerobic conditions. |
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| Keywords: | Biodegradation Aromatic compound Multicomponent substrate Aerobic Anoxic Cyclic Denitrification |
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