Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/17320

TitleBiodegradation of textile azo dyes by a facultative Staphylococcus arlettae strain VN-11 using a sequential microaerophilic/aerobic process
Author(s)Franciscon, E.
Zille, Andrea
Dias, G. F.
Menezes, C. R.
Durrant, L. R.
Paulo, Artur Cavaco
KeywordsAzo dyes
Staphylococcus arlettae
Biodegradation
Textile effluents
Aromatic amines
Issue dateApr-2009
PublisherElsevier
JournalInternational Biodeterioration & Biodegradation
Abstract(s)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.
TypeArticle
URIhttp://hdl.handle.net/1822/17320
DOI10.1016/j.ibiod.2008.10.003
ISSN0964-8305
Peer-Reviewedyes
AccessOpen access
Appears in Collections:DET/2C2T - Artigos em revistas internacionais com arbitragem científica

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