Study Of Dye Wastewater Treatment By Heterogeneous UV/Fenton Process

Dye wastewater discharged by the dyeing industry accounts for a large proportion of industrial wastewater.The application of traditional physico-chemical method and biochemical method is ineffective owing to characteristics of widely varied quantity, high chromatic, strong noxious, high concentration of COD and low biodegradability etc. pollution prevention research of dye wastewater is a important task of vigorously protect the environment and benefit mankind. Advanced oxidation process (AOP) because of its fast response, good treatment effect, is considered extremely has the prospect of application. One of the most concernd is Fenton reagent oxidation method, but there is still processing cost is higher, the actual application is not much, the study also insufficient system, etc. This topic carried out with heterogeneous UV/Fenton reagent experimental study on simulation of the dye wastewater treatment. Investigated the effect and degradation characteristics of dye wastewater treatment by this method, the process parameters is determined. Provide a theoretical basis and technical reference for the application.In this thesis, reactive-red X-3B dye wastewater was studied by heterogeneous UV/Fenton reagent oxidation method. The influence factors, performance of wastewater treatment and reaction dynamic was studied.Determine the optimum reaction parameters by the static test laboratory, using the single factor test and orthogonal test.The treatment of dye wastewater by heterogeneous UV/Fe-R/H2O2 system was studied. Different reaction factors on the heterogeneous UV/Fenton reagent, and the effects of treatment of dye wastewater was studied.When initial pH was 4,dosage of catalyst was 1.0g/L,dosage of H2O2 was 1Qth, normal atmospheric temperature, experiment time was 60mins,average degradation rate of reactive-red X-3B was 92.8% and average removal rate of COD was 72.3%.The treatment of dye wastewater by heterogeneous UV/Fe-Cu-R/H2O2 system was studied. Different reaction factors and inorganic anion on the heterogeneous UV/Fenton complexing catalyst, and the effects of treatment of dye wastewater was studied.When initial pH was 4, dosage of catalyst was 0.8g/L, dosage of H2O2 was 1Qth, normal atmospheric temperature, experiment time was 50mins,average degradation rate of reactive-red X-3B was 97.1% and average removal rate of COD was 70.2%. SO42- almost had no effects on the catalytic performance of UV/Fe-Cu-R/H2O2 system; Cl- lowerd the catalytic performance; when the concentration of NO3- was below 5mmol, it enhanced the catalytic performance, only when the concentration was over 10mmol, the catalytic performance was lowed.The reseach of reaction dynamics showed that, the degradation of reactive-red X-3B by heterogeneous UV/Fenton followed the first-order kinetics model. The dosage of catalyst and H2O2 had great influence on the reaction rate. The reaction rate was no more different when pH was 2-8. The reaction rate of UV/Fe-R/H2O2 system was lower than UV/Fe-Cu-R/H2O3 system.Heterogeneous UV/Fenton oxidation process was worth to be expanded as a dye wastewater treatment technology. It had a wide scope of application of pH; the secondary pollution of iron ion and the costs of treatment were reduced. In one word, this process had a good application prospect.