不同高级氧化体系处理染料废水的效果研究

THE COMPARISON OF TREATMENT EFFECT OF DYEING WASTEWATER WITH DIFFERENT ADVANCED OXIDATION SYSTEMS

分别采用UV-TiO2-O3、Fenton和UV-O3-Fenton这3种不同的氧化体系对高含量难生化降解染料废水进行预处理,并对其处理效果和反应机理进行了讨论。结果表明,UV-O3-Fenton氧化体系对废水的色度、COD去除及可生化性的改善均优于UV-TiO2-O3和Fenton氧化体系。当紫外灯功率为580 W、pH为4.5、体积分数为30%的H2O2投加量0.6 mL·L-1,n(H2O2)/n(O3)=0.85、n(H2O2)/n(Fe2+)=25:1,臭氧投加量为150 mg·L-1,t=200 min时,UV-O3-Fenton氧化体系对废水的色度、COD去除率及BOD5/COD分别可达100%、84.72%和0.72。

High concentrarion ,biorefractory dyeing wastewate was pretreated with UV-TiO2-O3, Fenton and UV-O3-Fenton oxidation system respectively, the treatment efficiency and reacation machanism of different oxidation systems were discussed. The results showed that the UV-O3-Fenton was superior to UV-TiO2-O3 and Fenton in the removal of chroma, COD and improvement of biodegradability of dyeing wastewater. When the optimum operation parameters were follows： the strength of ultraviolet irradiation is 580 W, pH was 4.5, the dosing quantity of 30% H2O2 was 0.6 mL·L^-1, n（H2O2）/n（03）=0.85, n（H2O2）/n（Fe^2＋）=25：1, the dosing quantity of ozone was 150 mg·L^-1, the oxidation time was 300 minutes, then the removal efficiency of chroma, COD and the of BOD5/COD can reach 100%, 88.54%, 0.74 respectively.