Studies On Photo-electro-chemical Catalytic Decolorizing Degradation Of Dye Wastewater

We discussed the reaction mechanism of advanced oxidation processes, adopting Fe/C/H₂O₂ and photo-electro-catalytic oxidation of refractory wastewater sepatately. some factors was studied which influenced the generation of hydroxy free-radical through advanced oxidation processes and the effect of degration on the printing and dyeing wastewater was reviewed, which contributed to the practice of the advancedoxidation processes.Firstly, the treatment of dye wastewater containing reactive green with a new reactive system of Fe/C/H₂O₂ was studied. Fe/C/H₂O₂ was adapted to dispose the wastewater, which combined iron/ carbon micro-electrolysis and hydrogen peroxide oxidation, building new Fe/C/H₂O₂ system. In the system, the hydrogen peroxide in combination with Fe²⁺, produced Fenton system, which cooperated with iron/ carbon micro-electrolysis to achieve the degradation of the organism. The influence of the mass ratio of Fe and C, the concentration of hydrogen peroxide, initial pH of the wastewater, reaction time, and the system temperature on the deodorization ratio of wastewater was researched. The experimental results showed that, under the conditions of room-temperature, the deodorization ratio and removal ratio of COD_Cr were 98% and 90% respectively when the mass ratio of Fe and C is 30:1, pH=4.5, the concentration of hydrogen peroxide is 50 mg/L, and the reaction time is 20 min as the colourity of the wastewater is 200. Compared with the single reaction system of Fe/C micro-electrolysis or Fenton's reagent, the efficiency of dye wastewater treatment of the new reaction system of Fe/C/H₂O₂ is higher.A new photo-electro-chemical catalytic reactor was designed, in which TiO₂/Ti thin film electrode thermally formed was used as photo-anodes, graphite as cathode and a saturated calomel electrode (SCE) as the reference electrode. In this experiment, the methyl orange was photo-oxidized with TiO₂/Ti electrode in anodic compartment, while hydrogen peroxide through reducing dissolved oxygen with graphite electrode in catholyte, in combination with UV radiation, also degraded methyl orange to achieve the purpose of "tow compartment and double effect". The effects of cathodic potential, the concentration of electrolyte, reactive time and pH on the decolouring rate of the methyl orange were investigated. It was shown that the electrolyte...