Study On The Treatment Of Oily Wastewater By Electro-Fenton Reagent

Oily wastewater with great capacity and complex component was hard to be treated, which would seriously polluted plants, soil, and water when it was discharged into environment. For now according to the survey, oily wastewater treatment in China commonly used process:degrease-coagulation and flotation-aerobic biological treatment, which couldn't always make the effluent meet the discharge standards. In order to achieving the purpose of oxidization and degradation oily wastewater effectively, advanced oxidation technology which could produce hydroxyl radical emerged as the requirement. Advanced oxidation such as electro-Fenton method had many advantages was received much attention.This study treated synthetically oily wastewater by means of electro-Fenton method and researched the influence factors in the process of oxidation and degradation. The optimum oxidation conditions were found by means of single factor test and combining with optimization of technological parameters. Treated synthetically oily wastewater using electro-Fenton collaborated results showed that, the oxidation efficiency of organic matter by means of electro-Fenton collaborated UV irradiation was higher than using electro-Fenton alone.Experiment used activated carbon fiber with good electric conductivity as cathode material compared to iron, and explored new activated carbon fiber materials as electrodes in electro-Fenton method, which could provide new ideas for cathode material selection and was beneficial to actual industrial wastewater. This dissertation had results as follows:(1) Orthogonal experiment results showed that the impact of various factors when used iron as cathode for the electro-Fenton as follows:pH> electrolysis voltage> the initial concentration of oil> electrolyte concentration> reaction time. The optimal parameters were pH= 2.5, voltage electrolysis was 10 V, the initial concentration of oil was 100mg/L, electrolyte concentration was 20 g/L, reaction time was 60 min. When used activated carbon fiber as the cathode, the impact of various factors as follows:pH > voltage electrolysis> reaction time> the initial concentration of oil> electrolyte concentration. The optimal parameters were pH=2.5, voltage electrolysis was 10 V, the initial concentration of oil was 100 mg/L, electrolyte concentration was 30 g/L, reaction time was 60 min.(2) Iron was used as cathode in electro-Fenton when treated synthetically oily wastewater, collaborating UV irradiation with electro-Fenton could increase the efficiency of oxidation.(3) The reaction kinetics followed ln(C0/Ct)= 0.011t+0.0595, when used electro-Fenton method with iron cathode to treat oily wastewater. When used activated carbon fiber as the cathode, the reaction kinetics followed ln(C0/Ct)= 0.0137t+0.0689.(4) The removal efficiency of oil using activated carbon fiber as cathode was better than iron cathode when used electro-Fenton treating synthetically oily wastewater.