Biodegradation of textile azo dyes by a facultative Staphylococcus arlettae strain VN-11 using a sequential microaerophilic/aerobic process
| Autor: | Ragagnin de Menezes Cristiano, Cavaco-Paulo Artur, Durrant Lucia Regina, Franciscon Elisangela, Dias Guimaro Fabio, Zille Andrea |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | portugalština |
| Rok vydání: | 2010 |
| Předmět: |
0106 biological sciences
Azo dyes Textile effluents Aromatic amines 010501 environmental sciences 01 natural sciences Microbiology Biomaterials Staphylococcus arlettae 010608 biotechnology Bioreactor Microaerophile Waste Management and Disposal Effluent 0105 earth and related environmental sciences chemistry.chemical_classification Science & Technology biology Aromatic amine Biodegradation biology.organism_classification 6. Clean water Activated sludge chemistry Aeration Nuclear chemistry |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | 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. The authors would like to thank the Portuguese Foundation of Science and Technology (FCT) for providing the grant to Andrea Zille (SFRH/BPD/24238/2005), and the Brazilian Foundation for the Coordination of the Improvement of University Graduates of the Ministry of Education (CAPES) and the National Research Counsel (CNPq) for providing the grants to Elisangela Franciscon. |
| Databáze: | OpenAIRE |
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