Grupo de Investigación en Procesos Avanzados para Tratamientos Químicos y Biológicos (GAOX) - Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad del Valle, Cali, Colombia.
Environ Sci Pollut Res Int. 2019 Mar;26(7):7164-7176. doi: 10.1007/s11356-019-04160-y. Epub 2019 Jan 16.
The aim of this study was to evaluate the performance of high purity magnesium and the magnesium-aluminum-zinc alloy AZ31 as sacrificial anodes in an electrocoagulation process with polarity change for the treatment of synthetic indigo carmine solution. It was studied the effect of the main parameters such as temperature, anodic material, current density, initial dye concentration, and agitation speed on the diminishing of indigo carmine concentration and non-purgeable organic carbon. Also, image analysis was used in conjunction with zeta potential measurements to understand the mechanism of flocs formation. The best results were 80% and 96% removal for non-purgeable organic carbon and dye content respectively at room temperature, by using turbulent regime, initial dye concentration of 100 mg L and 50 A m as current density with AZ31 alloy as electrodes. Particularly, high purity magnesium reached 75% in non-purgeable organic carbon removal and 86% in dye removal at the conditions described above. Finally, an additional improvement of 43% in the diminishing of the organic carbon content was observed when polarity change was used, a phenomenon that was attributed to the distribution of the oxidation reaction between electrodes, avoiding the saturation of the surface with oxide and hydroxide layers. Major areas and major fractal dimension were obtained by using a polarity change.
本研究旨在评估高纯镁和镁-铝-锌合金 AZ31 作为牺牲阳极在极性变化的电混凝过程中处理合成靛蓝胭脂红溶液的性能。研究了温度、阳极材料、电流密度、初始染料浓度和搅拌速度等主要参数对靛蓝胭脂红浓度和不可萃取有机碳减少的影响。此外，还结合动电电位测量使用图像分析来理解絮体形成的机制。在室温下，使用湍流状态，初始染料浓度为 100mg/L 和 50A/m 作为电流密度，使用 AZ31 合金作为电极，不可萃取有机碳和染料含量的最佳去除率分别为 80%和 96%。特别地，高纯镁在上述条件下的不可萃取有机碳去除率达到 75%，染料去除率达到 86%。最后，当使用极性变化时，观察到有机碳含量减少了 43%的额外改善，这一现象归因于电极之间氧化反应的分布，避免了氧化物和氢氧化物层的表面饱和。通过使用极性变化，可以获得主要区域和主要分形维数。
