Research On The Treatment Of Dye Wastewater By UV-fenton/Nanometer TiO₂ Catalytic Oxidation Process

While water shortage is in our country, we are also facing the problems of serious water pollution. Particularly, the emissions of industrial waste water has deteriorated water quality of urban water resources,and increased handling costs, which is a serious threat to the safety of drinking water for urban residents and people's health. Then the conflict of water shortage is exacerbated.Also it brings a severe negative impact on our ongoing strategy of sustainable development. Industrial wastewater is one of the sewage water difficult to deal with, especially the dyeing wastewater with its characteristics of complex composition,color depth,large variation of water quality and poor biodegradability. So effective and economic treatment of dyeing waste water has far-reaching impact on the dyeing industry,our living environment, and even the country's sustainable development.In the previous studies,UV-Fenton process and nanometer TiO2 photocatalytic oxidation process were separately, and now they will be combined together for dyeing wastewater treatment in this paper.Through the static analysis experiments with beakers,the single factor experiments indicate the influence of each factor on experiment, then scope of the parameters in orthogonal test can be determined.The optimum reaction conditions of UV-fenton/nanometer TiO2 catalytic oxidation process is determined by orthogonal experiment. The method will be compared with fenton process from the economic effect and treatment effect to the dyeing wastewater. In the best reaction conditions, the application in the treatment of dye wastewater by UV-fenton/nanometer TiO2 catalytic oxidation process also will be discussed.From the study, it shows that when the reaction parameters (the Fenton reagent's best ratio and dosage,catalyst dosage, pH value, the illumination intensity) change, the degree of influence on the reaction is not invariant. When the dosage of 30% H2O2 is 1ml,0.1mol/l FeSO4 is 3ml, nanometer TiO2 is 1.2 g, and pH value is 4, UV light irradiate for 15min,the distance between UV light and reaction equipment is 21cm,it is at the best removal efficiency.Then COD removal rate is more than 82%, decoloring rate is more than 98%.Compared with UV-Fenton process, UV-fenton/ nanometer TiO2 catalytic oxidation process is a more effective and economical method.Based on treatment for different concentration and different kinds of dyeing wastewater, UV-fenton/ nanometer TiO2 catalytic oxidation process provides a widely used method to deal with dyeing wastewater. The dyeing wastewater with different concentrations have various degradation efficiency, but the method is applicable for the different concentration. Because of different structure,different kinds of dyes influenced the photocatalytic degradation largely.Some dye structures play a significant role of inhibition in photocatalytic decoloration, while some promotion. Most dye wastewater can be applicable with the experimental methods. The nanometer TiO2 photocatalyst has the stable photocatalytic properties, which can be repeated use.So more economical it is.