dos Santos André B, Bisschops Iemke A E, Cervantes Francisco J, van Lier Jules B
Sub-department of Environmental Technology, Wageningen Agricultural University, Bomenweg 2, P.O. Box 8129, 6700 EV Wageningen, The Netherlands.
Chemosphere. 2004 Jun;55(9):1149-57. doi: 10.1016/j.chemosphere.2004.01.031.
The impact of different redox mediators on colour removal of azo dye model compounds and textile wastewater by thermophilic anaerobic granular sludge (55 degrees C) was investigated in batch assays. Additionally, a comparative study between mesophilic (30 degrees C) and thermophilic (55 degrees C) colour removal was performed with textile wastewater, either in the presence or absence of a redox mediator. The present work clearly evidences the advantage of colour removal at 55 degrees C compared with 30 degrees C when dealing with azo coloured wastewaters. The impact of the redox mediators anthraquinone-2,6-disulfonate (AQDS), anthraquinone-2-sulfonate (AQS) and riboflavin was evident with all dyes, increasing decolourisation rates up to 8-fold compared with the mediator-free incubations. The generation of the hydroquinone form AH2QDS, i.e. the reduced form of AQDS, was extremely accelerated at 55 degrees C compared with 30 degrees C. Furthermore, no lag-phase was observed at 55 degrees C. Based on the present results we postulate that the production/transfer of reducing equivalents was the process rate-limiting step, which was accelerated by the temperature increase. It is conclusively stated that 55 degrees C is a more effective temperature for azo dye reduction than 30 degrees C, which on the one hand can be attributed to the faster production/transfer of reducing equivalents, but also to the decrease in activation energy requirements.
在批次试验中，研究了不同氧化还原介质对嗜热厌氧颗粒污泥（55摄氏度）去除偶氮染料模型化合物和纺织废水颜色的影响。此外，对纺织废水在有或没有氧化还原介质存在的情况下，进行了中温（30摄氏度）和嗜热（55摄氏度）脱色的对比研究。目前的工作清楚地证明，在处理偶氮染色废水时，55摄氏度脱色比30摄氏度具有优势。氧化还原介质蒽醌-2,6-二磺酸盐（AQDS）、蒽醌-2-磺酸盐（AQS）和核黄素对所有染料的影响都很明显，与无介质培养相比，脱色率提高了8倍。与30摄氏度相比，在55摄氏度下，氢醌形式AH2QDS（即AQDS的还原形式）的生成极快加速。此外，在55摄氏度下未观察到滞后期。基于目前的结果，我们推测还原当量的产生/转移是过程速率限制步骤，温度升高加速了这一步骤。可以得出结论，55摄氏度比30摄氏度更有效地还原偶氮染料，一方面这可归因于还原当量的更快产生/转移，也归因于活化能需求的降低。
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