Ding Xiangyi, Qin Fangkai, Lai Lingling, Qin Caihong, Wang Ru
XAUAT UniSA An De College, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
Shaanxi Key Lab of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, People's Republic of China.
Environ Technol. 2025 Jul 16:1-10. doi: 10.1080/09593330.2025.2482979.
This study demonstrates the efficacy of a symmetrically designed flow-electrode capacitive deionization (FCDI) system for the electrochemical defluorination of photovoltaic (PV) wastewater, with a systematic investigation conducted to optimize operational parameters and analyze key factors influencing system performance, offering valuable insights into enhancing FCDI efficiency. The results revealed that an optimal applied voltage of 1.2 V yielded a fluoride removal efficiency of 92.9% with an energy consumption of 6.49 kWh/mol. Increasing the electrode content to 0.75 wt% enhanced the removal efficiency to 98.3%; however, further increases in electrode content led to higher energy consumption due to elevated viscosity. Optimizing the flow rate to 45 mL/min resulted in a removal efficiency of 98.6%, accompanied by improved adsorption rates and reduced energy consumption. Adding 1 g/L of electrolyte substantially enhanced system performance, achieving a fluoride removal efficiency of 92.9%. In mixed-ion wastewater, competitive adsorption between and F⁻ was observed. Doubling the concentration relative to F⁻ decreased the F⁻ removal efficiency from 96.2% to 87.3%. Nonetheless, the FCDI system demonstrated robust fluoride removal performance under high ion concentrations and complex matrix conditions, offering an efficient and sustainable approach for industrial wastewater treatment.
本研究展示了一种对称设计的流动电极电容去离子化（FCDI）系统用于光伏（PV）废水电化学脱氟的效果，进行了系统研究以优化运行参数并分析影响系统性能的关键因素，为提高FCDI效率提供了有价值的见解。结果表明，1.2 V的最佳施加电压产生了92.9%的氟去除效率，能耗为6.49 kWh/mol。将电极含量增加到0.75 wt%可将去除效率提高到98.3%；然而，由于粘度升高，电极含量的进一步增加导致能耗更高。将流速优化至45 mL/min可实现98.6%的去除效率，同时提高吸附速率并降低能耗。添加1 g/L的电解质可显著提高系统性能，实现92.9%的氟去除效率。在混合离子废水中，观察到 与F⁻之间的竞争吸附。相对于F⁻将 浓度加倍会使F⁻去除效率从96.2%降至87.3%。尽管如此，FCDI系统在高离子浓度和复杂基质条件下仍表现出强大的氟去除性能，为工业废水处理提供了一种高效且可持续的方法。
