双铝电极电絮凝处理高含氟地下水的影响因素及动力学分析

为探求电絮凝处理高含氟地下水工艺技术参数及其除氟动力学，采用双铝电极电絮凝装置处理人工模拟高含氟地下水，研究了双铝电絮凝除氟过程及其除氟动力学模型，分别考察了电流密度、pH、极板间距及初始氟浓度对电絮凝除氟过程影响。结果表明，电絮凝除氟过程符合一级反应动力学模型，理论所需除氟时间取决于初始氟浓度和除氟动力学常数，而除氟动力学常数受电流密度、极板间距和初始氟浓度影响；当电流密度为300 A·m⁻³，pH为6.0~7.0，极间距为10 mm时，双铝电絮凝除氟能效最高，氟离子去除率为89.56%，能耗为0.157 8 kWh·g⁻¹；但较高的初始氟浓度容易使铝氟比下降，导致除氟效果下降，不利于除氟过程。以上结果可为电絮凝处理高含氟地下水工程化应用和除氟反应器开发提供参考。

Influencing factors and kinetics analysis of electrocoagulation with bipolar aluminum electrodes treating high fluorine groundwater

Aiming to determine the process parameters for electrocoagulation treating high fluorine groundwater and its de-fluorine kinetics, the electrocoagulation with bipolar aluminum electrodes was used to treat high fluorine groundwater and study its de-fluorine process and kinetic model. The effects of current density, pH, electrode distance and initial fluorine concentration on the de-fluorine process by electrocoagulation were also investigated, respectively. The results showed that the electrocoagulation de-fluorine process followed the first-order kinetics model. The theoretical time of de-fluorine depended on the initial fluorine concentration and the kinetic constant, while the kinetic constant of de-fluorine was affected by current density, electrode distance and initial fluorine concentration. The highest fluorine removal efficiency by electrocoagulation with bipolar aluminum electrodes reached 89.56% with energy consumption of 0.157 8 kWh·g−1 when the operational parameters of current density, pH and electrode distance maintained at 300 A·m−3, 6.0~7.0 and 10 mm, respectively. However, the aluminum-fluorine ratio decreased with the increase of the initial fluorine concentration, resulting in a decrease in the fluorine removal efficiency, which was not conducive to de-fluorine by electrocoagulation. This research provides a theoretical basis for the practical application of electrocoagulation treating high fluorine groundwater and the development of de-fluorine reactor.