Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 63, Issue 3, Pages 280-288Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2008.10.003
Keywords
Azo dyes; Staphylococcus arlettae; Biodegradation; Textile effluents; Aromatic amines
Funding
- Portuguese Foundation of Science and Technology (FCT) [SFRH/BPD/24238/2005]
- Brazilian Foundation for the Coordination of the Improvement of University Graduates of the Ministry of Education (CAPES)
- National Research Counsel (CNPq)
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/24238/2005] Funding Source: FCT
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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 FNR 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 similar to 15% in the microaerophilic stage and similar to 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. (C) 2008 Elsevier Ltd. All rights reserved.
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