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Continuous treatment of an azo dye based on a combined ZVI/photo-Fenton setup. Process modelling by response surface methodology
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.jwpe.2020.101480
Jorge A. Donadelli , Eliana Berardozzi , Luciano Carlos , Fernando S. García Einschlag

The performance of a continuous system that sequentially couples a column filled with zero-valent iron with a photo-Fenton reactor was evaluated under mild acidic conditions. Studies were conducted to evaluate the better coupling strategy between each treatment module and to analyze the effects of several operational parameters on the system behaviour. The azo dye Acid Black 1 was chosen as model pollutant. Decolourization degrees and decreases of TOC values were used for the evaluation of the treatment performance under different conditions; whereas steady state concentrations of Fe(II), Fe(III) and H2O2 together with spectral features in the UV–vis region were analysed to elucidate mechanistic issues. The response surface methodology approach based on a central composite design was used to evaluate and model the effects of key factors on the decolourization degrees.

Results show that the spatial separation between the ZVI and H2O2 may lead to substantial improvements of treatment efficiencies provided that configurations involving recirculation loops are avoided. Besides, a strict and continuous pH control during the oxidative stage is critical for obtaining a stable operation and acceptable decolourization efficiencies through the coupled system. The simple parameters developed from UV–vis spectra allowed monitoring the extent of reductive and oxidative transformation pathways. In addition, the statistical analysis shows that reactor pH and hydraulic residence time are the key factors influencing the system response, whereas initial pH and added oxidant concentration are much less significant. The conclusions drawn are relevant from a technological viewpoint since allow a rational design of cost-effective treatments.



中文翻译:

基于ZVI / Photo-Fenton组合装置对偶氮染料进行连续处理。通过响应面方法进行过程建模

在温和的酸性条件下评估了连续系统的性能,该系统连续地将装有零价铁的色谱柱与光芬顿反应器相连。进行了研究,以评估每个处理模块之间更好的耦合策略,并分析了几个操作参数对系统性能的影响。选择偶氮染料酸性黑1作为模型污染物。使用脱色度和TOC值降低来评估不同条件下的处理性能;而稳态浓度的Fe(II),Fe(III)和H 2 O 2分析了紫外可见区域的光谱特征,以阐明机理问题。基于中央复合设计的响应面方法学方法用于评估和建模关键因素对脱色度的影响。

结果表明ZVI和H 2 O 2之间的空间分离如果避免使用涉及再循环回路的配置,可能会大大提高治疗效率。此外,在氧化阶段严格而连续的pH控制对于通过耦合系统获得稳定的操作和可接受的脱色效率是至关重要的。通过紫外可见光谱开发的简单参数可以监控还原和氧化转化途径的范围。此外,统计分析表明,反应器的pH值和水力停留时间是影响系统响应的关键因素,而初始pH值和添加的氧化剂浓度则没有那么重要。从技术角度来看,得出的结论是有意义的,因为可以合理设计具有成本效益的治疗方法。

更新日期:2020-06-30
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