逆电渗析电堆与电絮凝器耦合系统处理乳化油废水

Treatment of emulsified oil wastewater by the coupling system of reverse electrodialysis stack and electrocoagulation

通过对由逆电渗析(RED)技术与电絮凝(EC)技术结合构成由盐差能驱动的RED-EC耦合废水处理系统处理模拟乳化油废水的实验研究,探讨了电絮凝器电极材料、极板间距、支撑电解质浓度、废水初始pH及温度变化对乳化油废水除油率的影响。结果表明,与采用铝阳极材料相比,采用铁阳极材料的耦合废水处理系统具有更高的除油率。极板间距和含油废水参数(电导率、初始p H和温度)变化会对耦合废水处理系统的除油率产生影响。过大或过小的极板间距均对系统的除油率不利,在所研究的系统中,电絮凝器极板间距为1 cm时最佳。当废水的电导率很低时,系统的除油率也较低,适当增加支撑电解质可以迅速提高系统的除油率。中性或微碱性条件下系统的除油率较高。温度越高,系统的除油率也越高。在实验范围内,对总量为2 L、质量浓度为1 g·L^(-1)模拟乳化油废水经60 min絮凝处理后,除油率可达98.39%。

Based on an experimental study using the RED-EC coupling system powered by SGE energy to treat simulated emulsified oil wastewater,the impacts of the electrode material,plate spacing,supporting electrolyte concentration,initial pH and temperature of the wastewater on the removal rate were investigated.The results show that the coupled wastewater treatment system using iron anode material had higher oil removal rate than the aluminum anode material.The oil removal rate of coupled wastewater treatment system was affected by the variations of plate spacing and oily wastewater parameters(conductivity,initial pH and temperature).Too large or too small plate spacing was bad for the oil removal rate of the system,in the studied system,the best plate spacing of the electrocoagulation was 1 cm.When the conductivity of wastewater was very low,the oil removal rate of the system was also low,and appropriate addition of supporting electrolytes could quickly increase the oil removal rate of the system.The oil removal rate was higher under neutral or slightly alkaline conditions.The higher the temperature,the higher the oil removal rate of the system.In the experimental range,the oil removal rate of 2 L simulated emulsified oil wastewater with a mass concentration of 1 g·L^(−1) could reach 98.39%after 60 min electrocoagulation treatment.