Biodegradation of textile azo dyes by a facultative Staphylococcus arlettae strain VN-11 using a sequential microaerophilic/aerobic process |
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| Authors: | Franciscon Elisangela Zille Andrea Dias Guimaro Fabio Ragagnin de Menezes Cristiano Durrant Lucia Regina Cavaco-Paulo Artur |
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| Institution: | 1. Campinas State University, Department of Food Science, 13083-970 Campinas, São Paulo, Brazil;2. IBMC – Instituto de Biologia Molecular e Celular, Universidade do Porto, Portugal;3. University of Minho, Department of Textile Engineering, 4800-058 Guimarães, Portugal;1. Department of Biotechnology Engineering, NMAM Institute of Technology, Nitte, Karnataka, India;2. Department of Chemistry, and Centre for Energy Science, Indian Institute of Science Education and Research, Pashan, Pune, 411008, India;3. Department of Biotechnology, Bioscience Division, Kuvempu University, Shankaraghatta, Shimoga, Karnataka, India;1. Mathematical Modelling of Infectious Diseases, Institut Pasteur, Paris, France;2. Emerging Diseases Epidemiology Unit, Institut Pasteur, Paris, France;3. Centre for Global Health, Institut Pasteur, Paris, France;4. Neonatal Care Department, French Polynesia Hospital Centre, Pirae, Tahiti, French Polynesia;5. Medical Imaging Department, French Polynesia Hospital Centre, Pirae, Tahiti, French Polynesia;6. Gynecology-Obstetrics Department, French Polynesia Hospital Centre, Pirae, Tahiti, French Polynesia;7. Bureau de Veille Sanitaire, Direction de la Santé, Papeete, Tahiti, French Polynesia;8. Department of Epidemiology, Johns Hopkins University, Baltimore, MD, USA;9. General Paediatrics Department, Necker Hospital, Paris, France;10. Department of Paediatric Radiology, Hôpital d''Enfants Armand-Trousseau, Paris, France;11. Conservatoire National des Arts et Métiers, Paris, France |
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| Abstract: | A facultative Staphylococcus arlettae bacterium, isolated from an activated sludge process in a textile industry, was able to successfully decolourize four different azo dyes under microaerophilic conditions (decolourization percentage >97%). Further aeration of the decolourized effluent was performed to promote oxidation of the degradation products. The degradation products were characterized by FT-IR and UV–vis techniques and their toxicity with respect to Daphnia magna was measured. The amine concentrations as well as the total organic carbon (TOC) levels were monitored during the biodegradation process. The presence of aromatic amine in the microaerophilic stage and its absence in the aerobic stage indicated the presence of azoreductase activity and an oxidative biodegradation process, respectively. TOC reduction was ～15% in the microaerophilic stage and ～70% in the aerobic stage. The results provided evidence that, using a single Staphylococcus arlettae strain in the same bioreactor, the sequential microaerophilic/aerobic stages were able to form aromatic amines by reductive break-down of the azo bond and to oxidize them into non-toxic metabolites. |
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