UV-Fenton技术在热电厂废水中的应用研究

Application of UV-Fenton technology in Treatment of Wastewater From Thermal Power Plants

以七水硫酸亚铁、双氧水为原料在热电厂废水中合成了fenton试剂,并研究了fenton试剂在热电厂废水中的应用工艺条件,以解决电厂废水中COD含量高,处理难度大问题,在最佳fenton处理工艺基础上与UV技术组合使用,进一步提升COD去除率。探索了原料摩尔比、体系浓度、反应时间、溶液pH对废水中COD去除率的影响。实验结果表明:双氧水、硫酸亚铁摩尔比为6:1、体系中Fe^2+浓度为15 mg/L、反应时间为4 h、溶液pH为6时,得到的fenton试剂具有最高催化氧化性能,在此条件下废水中COD去除率为93.7%,采用UV-fenton组合技术进一步处理,考察了紫外波长为254、365 nm条件下,废水中COD去除率变化,结果显示,当紫外波长为254 nm时废水去除率达到98.6%。

Using FeSO4·7 H2O and H2O2 as raw materials, Fenton reagent was synthesized, and the Fenton reagent application conditions in treatment process of thermal power plant wastewater were studied in order to solve the problem of high COD in the wastewater. The best Fenton process was combined with UV technology to further enhance the removal rate of COD. Effect of raw material molar ratio, system concentration, reaction time and system solution pH on COD removal rate of wastewater was investigated. The experimental results showed that when the mole ratio of hydrogen peroxide to ferrous sulfate was 6:1, Fe^2+ concentration was 15 mg/L, the reaction time was 4 h,the solution pH was 6, the catalytic oxidation property of Fenton reagent was the best, the highest removal rate of COD in wastewater was 93.7%. During further treatment of wastewater by UV-Fenton combination technology, the removal rate of COD in wastewater under the ultraviolet wavelength of 254 and 365 nm was investigated. The results showed that when the ultraviolet wavelength was 254 nm, the COD removal rate of waste water reached 98.6%.