Study On The Degradation Of Phenolic Wastewater By Three-dimensional Electrode Reactor

The coking wastewater and artificial phenol-containing sewage are degraded by electrochemical oxidation in the three-dimensional electrode reactor in this thesis. Furthermore, the effects of operating conditions on the oxidation efficiency of organic pollutants, such as cell voltage, electrolyte concentration, initial pH, concentration of wastewater and the quantity of particle electrodes are also investigated.The experimental results show that the organic pollutants could be oxidized much better in the undivided three-dimensional electrode reactor compared with the conventional electrochemical techniques. The acidic media is favorable to the oxidation of organic pollutants for Fenton reagent which is composed of Fe(â…¡) and hydrogen peroxide, so the results of degradation under acidic media are much better than that under neutral and alkali media. Prolonging the degrading time and increasing the cell voltage are benefit to accelerate the degradation rate. The quantity of particle electrodes has great influence to the degradation of organic pollutants. The oxidation ratio can be improved rapidly with a constant airflow of 10L/min. And the removal ratio of phenol is reduced 20% when the concentration of wastewater increases from 100mg/L to 1000mg/L, but the removal value of phenol is increased quickly. Various influencing factors are produced by the assistant electrolyte during electrolysis, and the effects of influencing factors are different under different cell voltages. For the complex of coking wastewater, the organic pollutants removal rate is lesser in the three-dimensional electrode reactor compared with artificial phenol-containing sewage.Concluding from the repeated running experiments, the organic pollutants removal rate is decreased with the increase of repeated runs (N) under the condition of the particle electrodes reused many times. With 20V cell voltage, the organic pollutants removal rate is decreased to 44% when N is 30. Under the similar condition, when N is 30, the organic pollutants removal rate is improved 23% with the constant airflow of 10L/min compared with no aerating.