ABSTRACT

In this study, novel high throughput metal waste chips and foam electrodes were developed for the electrocoagulation of graywater for the first time. The developed electrodes were then compared with traditional metal plate electrodes, which showed higher efficiency of developed electrodes. The effective parameters of pH, electrode distance, applied voltage, and reaction time on COD removal were optimized using RSM as a multivariate optimization technique, and the data were analyzed by ANOVA, normal plot, residual distribution, and 3D plots. The optimal conditions for electrocoagulation of graywater using metal (Al) plate electrode were determined as a pH of 6.86, electrode distance of 5 mm, and applied voltage of 5 V for a reaction time of 10 min, resulting in 89.1% COD removal and 74% turbidity removal. Finally, the performance of aluminum plate electrodes, foam electrodes, and electrodes made from metal waste chips was compared using COD removal efficiency as the index, revealing 84%, 93%, and 87% COD removal, respectively. These results demonstrated that the newly developed electrodes are suitable for graywater treatment with excellent COD removal efficiency, metal chip waste recycling, and cost-saving.

摘要

在这项研究中，首次开发了用于灰水电凝的新型高通量金属废屑碎片和泡沫电极。然后将开发的电极与传统的金属板电极进行比较，这表明开发的电极效率更高。使用 RSM 作为多元优化技术优化了 pH 值、电极距离、施加电压和反应时间对 COD 去除的有效参数，并通过方差分析、正态图、残差分布和 3D 图分析数据。使用金属 (Al) 板电极电凝灰水的最佳条件确定为 pH 值为 6.86，电极距离为 5 mm，施加电压为 5 V，反应时间为 10 分钟，COD 去除率为 89.1%，COD 去除率为 74 % 浊度去除。最后，以COD去除效率为指标比较了铝板电极、泡沫电极和金属废屑电极的性能，分别显示出84%、93%和87%的COD去除率。这些结果表明，新开发的电极适用于灰水处理，具有出色的 COD 去除效率、金属屑废物回收利用和节约成本。