电化学氧化-臭氧氧化联合方法处理罗丹明B模拟染料废水

采用碳黑-聚四氟乙烯(C-PTFE)为阴极的电化学氧化-臭氧氧化联合方法处理罗丹明B模拟染料废水,考察了初始pH、电解质浓度、电流和臭氧流量对废水处理效果的影响。实验结果表明:联合体系可高效处理罗丹明B废水,在初始pH为6、Na2SO4浓度为0.050 mol/L、电流为300 mA、臭氧流量为873 mg/h的条件下,反应3 min时废水的脱色率可达99.64%,120 min时废水COD去除率为83.17%,分别是同条件下单一臭氧氧化和电化学氧化的9.7倍和21.7倍;COD去除过程符合一级反应动力学模型。臭氧通过破坏发色基团实现罗丹明B的降解,然后由体系产生的·OH实现废水的深度氧化处理。

Treatment of simulated rhodamine B dye wastewater by electrochemical oxidation-ozone oxidation combination process

The electrochemical oxidation-ozone oxidation combination process with carbon-polytetrafluoroethylene(C-PTFE)as the cathode was applied to treat the simulated rhodamine B dye wastewater.The effects of initial pH,electrolyte concentration,current and ozone flux on wastewater treatment were investigated.The experimental results show that:Under the conditions of initial pH 6,Na2SO4 concentration 0.050 mol/L,current 300 mA and ozone flux 873 mg/h,the decolorization rate of the wastewater can reach 99.64%after reaction for 3 min,the COD removal rate can reach 83.17%after reaction for 120 min,which is 9.7 times and 21.7 times of that treated by ozone oxidation and electrochemical oxidation individually under the same conditions;The COD removal process is in accordance with the first-order reaction kinetic model.Ozone degrades rhodamine B by destroying the chromophore group,and the wastewater is advanced oxidized by·OH produced in the combination system.