Xue Wenjuan, Hong Xiaoting, Du Yingying, Chen Bin
Department of Chemistry, School of Science, Zhejiang Sci-tech University, Hangzhou 310018, P. R. China E-mail:
Zhejiang Agriculture and Forestry University, Lin'an 311300, China.
Water Sci Technol. 2023 Feb;87(4):924-937. doi: 10.2166/wst.2023.032.
The diverse compositions and complex nature of the textile wastewater make it imperative to find an economical and suitable degradation pathway. The degradation of real textile wastewater on a novel heterogeneous electro-Fenton system was carried out with a composite anode of magnetically fixed micron ZVI coupling with a Ti/RuO-IrO sheet. The influences of different variables such as mZVI dosage, HO amount, applied voltage and pH value on both total organic carbon and chemical oxygen demand removal efficiencies and energy consumption were investigated. The optimized parameters were simultaneously verified by using electrochemical workstation Tafel curves and Nyquist plots. The optimal operating conditions for evaluating the wastewater treatment were HO dosage of 0.10 mol·L, applied voltage of 5.0 V, mZVI amount of 1.0 g·L and initial pH value of 3.0. The high TOC and COD removal efficiencies of 92.44 and 82.84% could be achieved simultaneously in 60 min, respectively. XRD, XPS and SEM-EDS were used to investigate the interaction between the pollutant and the mZVI. GC-MS analysis was performed on untreated and treated wastewater to determine the degradation of pollutants in dyeing wastewater during the electro-Fenton process and to effectively propose a suitable degradation mechanism for this system.
纺织废水的成分多样且性质复杂，因此必须找到一种经济且合适的降解途径。采用磁固定微米级零价铁与钛/钌 - 铱涂层板复合阳极的新型非均相电芬顿系统对实际纺织废水进行降解。研究了不同变量，如零价铁用量、过氧化氢用量、施加电压和pH值对总有机碳和化学需氧量去除率以及能耗的影响。利用电化学工作站的塔菲尔曲线和奈奎斯特图同时验证了优化参数。评估废水处理的最佳操作条件为：过氧化氢用量0.10 mol·L，施加电压5.0 V，零价铁用量1.0 g·L，初始pH值3.0。在60分钟内，总有机碳和化学需氧量的去除率可分别同时达到92.44%和82.84%。利用X射线衍射（XRD）、X射线光电子能谱（XPS）和扫描电子显微镜 - 能谱仪（SEM - EDS）研究污染物与零价铁之间的相互作用。对未经处理和处理后的废水进行气相色谱 - 质谱联用（GC - MS）分析，以确定电芬顿过程中印染废水污染物的降解情况，并有效地为该系统提出合适的降解机制。
