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| Laboratory study on the decolorization of reactive brilliant blue X-BR treated by an integrated Fe0–anaerobic biological system |
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Abstract An anthraquinone dye, reactive brilliant blue X-BR, was treated by an integrated Fe0-anaerobic biological system. Through shake flasks tests, the effects of some factors, such as Fe0 dose, pH, etc., on the decolorization of X-BR were studied. The decolorization effects of the dye in three different treatment systems were compared as well. The Fe0 concentration and pH had optimal values during the decolorization of X-BR in Fe0-anaerobic biological system. When Fe0 dose, initial pH value and X-BR concentration were 400mg/L, 7 and 100 mg/L respectively, the decolorization rate of X-BR in the integrated system could reach up to 90% after 68 h reaction. Compared with pure Fe0 and pure microorganism treatment systems, it could be improved about 40% under the same experimental conditions. In addition, the analysis result of UV-vis spectrogram indicated that Fe0 could promote effectively biodegrading of anthraquinone dye X-BR and its intermediate products. The decolorization kinetics of X-BR was in accordance with pseudo first-order reaction dynamics and the reaction rate constant reduced from 0.0470h-1 to 0.0102h-1 with the dye concentration increased from 50mg/L to 800mg/L.
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Received: 20 August 2009
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