Study On Photocatalystic Degradation Of Dyes And Pesticide In Ferrioxalate-Hydrogen Peroxide System

Pollution is becoming increasingly severe in environment with the progress and development of the human society. Wastewater-treatment techniques are one of most imperative research projects. Most pollutants generated in living exist in water. Ground water and drinking water are polluted by the untreated wastewater, which badly influence human living and production. Solar photocatalystic processes have the potential to decompose most organic contamination, including dye and pesticide that are difficult to be treated by routine technique. Compared with the routine technique, solar photocatalystic processes have much merit, such as using free solar energy and not causing the second pollution. In this paper, the treatment of wastewater basing on Ferrioxalate/hydrogen peroxide systems was studied. Main researches include three aspects: photocatalystic reactor, degradation of dye, degradation of pesticide. To study the performance of photocatalystic reactor, we designed and made the experiment rig that is fit for sewage treatment. Considering practical applications, we have discussed the optimum inclination for flat photocatalystic reactor. Under the condition of lack solar radiation fact survey date founded on wave band, the suggestions to determine the optimum inclinations for flat solar collector are given. In the experiments of degradation of dye, Congo red and Methylene blue dyes were taken as targets' contamination. Under the condition of different pH values, concentrations of hydrogen peroxide, flux, concentrations of iron ion, a series of experiments were done. The results indicate that the degradation of dye prefer to the acidic aqueous environment. There were the optimum values for the amount of hydrogen peroxide and the concentration of iron ion. Increasing of the liquid flow rate and concentration of iron ion is benefit for the dyes' destruction. Ferrioxalate-hydrogen peroxide systems have effectively destructed dyes by using the rig in indoor and outdoor. In the experiment of degradation of pesticide, dimethoate was taken as a targets' contamination, the optimal conditions were determined by the orthogonal experiment method. Some suggestions about the development of the technique are given.