基于含油废水处理的电催化膜反应器优化设计及性能研究

摘要

以负载纳米TiO2的电催化膜为阳极,辅助电极为阴极,构成电催化膜反应器用于含油废水处理.考察了电极间距、电解质浓度、电流密度、空时速率、pH和温度对电催化膜反应器降解效果即含油废水化学需氧量(COD)去除率的影响.根据单因素实验分析结果,采用响应面法对电极间距、电解质浓度、pH和温度四个参数进行优化,得出最佳参数为:电极间距43.1mm,电解质浓度14.3 g/L,pH=6.3,温度32.5℃.在电流密度0.312mA/cm2,空时速率15.8 h-1的条件下,电催化膜反应器处理200mg/L含油废水COD去除率为97.54％,能耗为0.75 kWh/m3.%A electro-catalytic membrane was used as an anode, and stainless steel tube as a cathode, and both electro-catalytic membrane and stainless steel tube were connected by a DC regulated power supply to constitute an electro-catalytic membrane reactor (ECMR), which was employed to treat the oily water. This research investigated the influence of the rector' s parameters such as electrode spacing, the concentration of electrolyte, current density, liquid hourly space velocity, solution pH and temperature on the removal rate of oily wastewater chemical oxygen demand (COD). The electrode spacing, the concentration of electrolyte, the solution pH and temperature were investigated through response surface method according to the single factor analysis of experimental results. Results showed the optimum conditions for the membrane reactor were the electrode spacing of 43. 1 mm, the concentration of electrolyte of 14. 3 g/L, pH of 6. 3 and temperature of 32. 5 ℃. It was also found that the COD removal rate for the ECMR to treat 200 mg/L oily wastewater was 97. 54% at current density of 0. 312 mA/cm2 and liquid hourly space velocity of 15. 8 h-1. It was close to the predicted removal rate of 98. 75%. From the model the energy consumption was 0. 75 kWh / m3 and 3. 30 kWh/kg(COD) during the treatment of 200 mg/L oily wastewater.