Assessment of the biodegradability of a monosulfonated azo dye and aromatic amines |
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Authors: | MC Carvalho C Pereira IC Gonalves HM Pinheiro AR Santos A Lopes MI Ferra |
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Institution: | aChemistry Department, University of Beira Interior, R. Marquês D’Avila e Bolama 6200-Covilhã, Portugal;bCentre of Biological and Chemical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, P-1096 Lisbon, Portugal |
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Abstract: | Biodecolourisation of an azo dye by anaerobic cultures using a liposomal textile levelling agent as primary substrate was assessed. Liposomes seem to facilitate the uptake of the dye (Acid Orange 7) by anaerobic biomass, leading to a fast decolourisation (colour removal of 96% was achieved in the first sample port of the reactor profiles). On the other hand, the presence of dye (60–300 mg l−1) caused a decrease in the chemical oxygen demand (COD) degradation rate (4.1–2.5 g COD removed l−1 d−1 for 60 and 300 mg l−1 of dye, respectively), suggesting inhibitory effects.Aerobic degradation of aromatic amines was investigated in aerobic respirometric assays with different types of inocula. Sulfanilic acid and aniline were mineralised by inocula with a significant microbiological diversity, even with domestic effluent. These results were confirmed by a significant reduction of COD, total organic carbon (TOC) and a high oxygen consumption (biochemical oxygen demand/theoretical oxygen demand), 92±4%. Kinetic analysis showed that a sigmoid function describes quite well the experimental data, even better than the exponential model. Orthanilic and metanilic acids and 1-amino-2-naphtol were persistent under the tested conditions. |
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Keywords: | Anaerobic biodecolourisation Liposomes Azo dyes Aerobic degradation Aromatic amines |
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