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首页> 外文期刊>Chemosphere >Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30℃) and thermophilic (55℃) treatments for decolourisation of textile wastewaters
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Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30℃) and thermophilic (55℃) treatments for decolourisation of textile wastewaters

机译：不同氧化还原介质在厌氧颗粒污泥还原嗜热偶氮染料过程中的效果以及中温（30℃）和高温（55℃）处理纺织品废水脱色的比较研究

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摘要

The impact of different redox mediators on colour removal of azo dye model compounds and textile wastewater by thermophilic anaerobic granular sludge (55℃) was investigated in batch assays. Additionally, a comparative study between mesophilic (30℃) and thermophilic (55℃) 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℃ compared with 30℃ when dealing with azo coloured wastewaters. The impact of the redox mediators anthra-quinone-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 AH_2QDS, i.e. the reduced form of AQDS, was extremely accelerated at 55℃ compared with 30℃. Furthermore, no lag-phase was observed at 55℃. 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℃ is a more effective temperature for azo dye reduction than 30℃, 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.
机译：批量试验研究了不同的氧化还原介质对嗜热厌氧颗粒污泥（55℃）对偶氮染料模型化合物和纺织废水的脱色的影响。此外，在有或没有氧化还原介体的情况下，对纺织品废水进行了中温（30℃）和嗜热（55℃）脱色的比较研究。目前的工作清楚地表明，在处理偶氮染料废水时，与30℃相比，在55℃脱色的优势。氧化还原介体蒽2,6-二磺酸蒽醌（AQDS），蒽醌-2-磺酸蒽（AQS）和核黄素的影响在所有染料中均很明显，与无介质孵育相比，脱色率提高了8倍。 。与30℃相比，在55℃时，AH_2QDS的对苯二酚（即AQDS的还原形式）的生成被大大加速。此外，在55℃下没有观察到滞相。根据目前的结果，我们推测还原当量的生产/转移是过程速率限制步骤，该步骤因温度升高而加速。结论是55℃是比30℃更有效的偶氮染料还原温度，这一方面可以归因于还原当量的更快生产/转移，还可以归因于活化能需求的降低。

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