新型光电-Fenton法处理印染废水的研究

Study on the Treatment of Printing and Dyeing Wastewater by New Type Photoelectro-Fenton Method

以TiO2/Ti为阳极,活性炭纤维(ACF)为阴极,建立新型光电-Fenton体系,光催化、电-Fenton对比研究了处理COD及色度的去除率;并采用紫外可见光谱及三维荧光光谱探讨了各处理过程中有机物的变化规律。结果表明,在pH=4、紫外灯功率15 W、电流密度10.0 m A/cm^2、曝气量1.5 L/min条件下,处理120 min后,新型光电-Fenton对印染废水COD的去除率高达92.05%,高于光催化(15.81%)与电-Fenton(70.38%)之和;脱色率达99.51%。与光催化和电-Fenton对比,新型光电-Fenton不仅能在较短的时间内将大部分大分子降解为小分子或直接矿化,且能将难降解的类腐殖酸及类富里酸物质转化为易降解物质,甚至完全降解。

The COD and chroma removal rates of printing and dyeing wastewater(PDW) by photoelectro-Fenton(PEF) process with TiO2/Ti as anode and activated carbon fiber(ACF) as cathode were studied, the compared with photocatalytsis(PC) and electro-Fenton(EF) method. The change rules of organic in each treatment process were discussed by ultraviolet-visible spectrum and three-dimensional fluorescence spectrum. The results showed that,when pH, UV light power, current density, aeration rate and treatment time was 4, 15 W, 10.0 mA/cm2, 1.5 L/min and 120 min respectively, the COD removal efficiency of PDW by PEF reached 92.05%, which was higher than the sum of PC(15.81%) and EF(70.38%), and the decolouration rate(99.51%)was also very high. Compared with PC and EF, the components with large molecular weight could be transformed into the components with small molecular mass or even be mineralized, and the non-biodegradable substances(humic-like and fulvic-like substances) could be transformed into biodegradable substances within a short time by PEF.