石墨驱动电极电絮凝深度处理光伏含氟废水机理  

Mechanism of graphite driven electrode electrocoagulation for deep treatment of fluorine-containing wastewater

作　　者：汪裴 计汶琦 汪莹 寇晓晓 袁怡 WANG Pei;JI Wenqi;WANG Ying;KOU Xiaoxiao;YUAN Yi(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;National Local Joint Engineering Laboratory for Urban Domestic Sewage Resource Utilization Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]城市生活污水资源化利用技术国家地方联合工程实验室,苏州215009

出　　处：《环境工程学报》2025年第1期135-143,共9页Chinese Journal of Environmental Engineering

基　　金：城市生活污水资源化利用技术国家地方联合工程实验室开放课题(2018KF01)。

摘　　要：该研究引入了双极石墨驱动+铝电极处理模拟钙沉淀后低浓度含氟废水。分别考察了极板间距、初始pH、电流密度和电解时间等因素对除氟率的影响。单因素实验结果表明最佳工艺为极板间距1.5 cm、初始pH为6、电流密度为20 A·m^(-2),电解时间30 min。利用Origin拟合发现电絮凝除氟过程遵循一级动力学方程。FT-IR测得电絮凝沉淀物成份有Al(OH)3和Al—F配合物,说明电絮凝除氟机理主要为Al系物质的絮凝沉淀作用,同时伴随着配合物生成协同去除。对比电絮凝絮体产物与电絮凝同步除氟实验结果,发现絮体具有吸附性,电絮凝原位产生絮体比电解生成絮体除氟效果更好。SEM、XRD测得絮体属于无定形非晶体结构。利用装置对实际废水进行处理,相比于配水的效能有所下降,但出水F−<2 mg·L^(−1)。This study introduced bipolar graphite drive and aluminum electrode to treat low concentration fluorine-containing wastewater after simulating calcium precipitation.The effects of electrode spacing,initial pH,current density and electrolysis time on fluoride removal rate were investigated respectively.The results of the single factor experiment showed that the optimal process was plate spacing of 1.5 cm,initial pH of 6,current density of 20 A·m^(-2) and electrolysis time of 30 min.Using Origin fitting,it was found that the process of defluorination by electrocoagulation follows a first-order kinetic equation.Fourier transform infrared spectroscopy analysis revealed the presence of Al(OH)3 and Al—F complexes in the electrocoagulation precipitate,indicating that the main mechanism of defluorination by electrocoagulation was the coagulation and precipitation of Al based substances,accompanied by the synergistic removal of complexes.Comparing the results of synchronous defluorination experiments with electrocoagulation flocs,we found that flocs have adsorption properties,and the in-situ generation of flocs by electrocoagulation had a better defluorination effect than the generation of flocs by electrolysis.Scanning electron microscopy and X-ray diffraction measurements indicated that the flocs belong to an amorphous structure.The efficiency of using the device to treat actual wastewater had decreased compared to water distribution,but the effluent F−<2 mg·L^(−1).

关 键 词：电絮凝 深度除氟 吸附共沉 

分 类 号：X703[环境科学与工程—环境工程]