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The treatment of azo dyes found in textile industry wastewater by anaerobic biological method and chemical oxidation

机译：厌氧生物法-化学氧化法处理纺织废水中的偶氮染料

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The treatment of synthetic wastewater containing azo dyes found in textile industry wastewater was carried out by anaerobic biological method and chemical oxidation. The main target of this study was to compare different treatment methods and to evaluate the effect of different parameters on treatment effectiveness. In the microbial process, the results have shown that increasing the residence time, the amount of yeast extract and the addition of microorganisms originally growing on forest residues had positive effects on the dye removal. In the catalytic wet peroxide oxidation process, CWPO, the reaction conditions were optimized at 0.5 g/L activated carbon loading with 2 mL H2O2/300 mL solution (35 wt%), at 80 °C, in 2 h with pH = 3. At the optimum conditions, approximately 93% of the dye was removed. At these optimized conditions, the CWPO process was tested with real textile industry wastewater. The percentage of dye removal with this wastewater was 50%. The adsorption effect of the activated carbon was also investigated. At pH = 7, the removal by just adsorption was around 15%. But in acidic conditions (pH = 3) and at higher temperatures the adsorption effect of activated carbon increased. Adsorption and oxidation performances were compatible at 80 °C, however, at lower temperatures the adsorption effect was more considerable than the oxidation. It can be concluded that, generally the decolorization was accomplished by 60% adsorption and by 40% oxidation.
机译：纺织废水中发现的含偶氮染料的合成废水的处理采用厌氧生物法和化学氧化法。这项研究的主要目标是比较不同的治疗方法，并评估不同参数对治疗效果的影响。在微生物过程中，结果表明，增加停留时间，酵母提取物的量以及最初在森林残留物上生长的微生物的添加对染料去除具有积极影响。在湿法催化湿式氧化工艺CWPO中，将反应条件优化为在80 g，2 h，pH = 3的条件下，在2 g H2O2 / 300 mL溶液（35 wt％）中加入0.5 g / L活性炭。在最佳条件下，大约93％的染料被去除。在这些优化的条件下，使用真实的纺织工业废水对CWPO工艺进行了测试。用这种废水去除染料的百分比为50％。还研究了活性炭的吸附效果。在pH = 7时，仅通过吸附的去除率约为15％。但是在酸性条件下（pH = 3）和更高的温度下，活性炭的吸附效果增强了。吸附和氧化性能在80°C时是兼容的，但是，在较低的温度下，吸附效果比氧化更重要。可以得出结论，通常脱色是通过60％的吸附和40％的氧化完成的。

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