The Technical Study On The Refractory Organic Wasterwater By Electrolysis

The refractory organics owns biologic inhibitory and are difficult to biochemical degradation.Nitrophenol wastewater, cooking wastewater treatment process were studied in this paper.The research has found that the electrochemical treatment of refractory organic wasterwater is feasible.Electrode material is one of the cores of the electrochemical techniques and the main considerations are the electro-catalytic activity, stability, conductivity, etc. Different anodes were prepared by anodic electrodeposition technique. We found that compared to other anodes, Fe doped PTFE-PbO2/TiO2-NTs/Ti shows better properties such as oxygen evolution potential, service life, electro-catalytic activity.Using p-NP and CODcr concentration as an indicator and changing the different values of experimental paramenters about current density, initial concentration, pH supporting electrolyte and degradation time, we were mainly to find out the optium reaction conditions on p-NP degradation over Fe doped PTFE-PbO2/TiO2-NTs/Ti electrode. The generation of·OH increases with the current density, so the removal rate increases with the increase of current density; the larger the initial concentration, the stronger the diffusion. But the intermediates involved in the competition of·OH degradation, so the effect was not so good as the lower initial concentration.It can inhibit the oxygen evolution reaction under the acidic condition. When the electrolyte was NaCl, Cl-was oxided to the strong oxidizing ClO-which can improve the removal effiency; choosing Na2SO4as the electrolyte, in a certain concentration, the higher the concentration of Na2SO4, the more oxidizing S2O82-, which can also strengthen the degradation. Therefore the optimum experimental parameters for the current density was20mA/cm2, the initial concentration was100mg/L, pH was5.1, the concentration of Na2SO4was0.02mol/L.Then compared with the above simulated wastewater and making the coking wasterwater as the research object, we were mainly to research the Fe doped PTFE-PbO2/TiO2-NTs/Ti electrode on the actual wasterwater degradation.Changing the experimental parameters of the current density, pH and electrolysis time, we found that the higher the current density, the higher CODcr and NH3-N removal rate and the NH3-N removal efficiency was better than CODcr in the same condition. CODcr removal efficiency was higher in the acidic solution, and NH3removal efficiency was higher in the alkaline solution for NH3can overflow from the solution.In the current density20mA/cm2, pH value7, coking wastewater could be charged after30min degradation.