Abstract
The bacterium Pseudomonas spp. MPS-2, isolated from an activated sludge process in a textile industry of Ankleshwar, Guajrat, India, 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 Pseudomonas 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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