Experimental Study Of Treating Wastewater By High Voltage Pulse Discharge Combined With Photocatalytic Composite Material

High voltage pulse discharge non-equilibrium plasma water treatment is one type of advanced oxidation technology, which integrates effectiveness of many active species including hydroxyl radical, hydrogen peroxide, ozone, etc., and bears preferable future application and large market potential because of its advantages such as low energy consumption, high treatment efficiency, rapid and non-selective reactivity, and free of secondary pollution, etc.. One of the current difficulties for widely application of this technology exists mainly in selection of appropriate adsorbents and catalysts. In this work, two kinds of photocatalytic composite material were prepared by sol-gel method. One was TS/ACF doped with Si, and the other was TF/ACF doped with Fe. After adding the photocatalytic composite material, the degradation got great enhancement. At the same time, a series of correlative factors'effect on combined treatment was researched and the best technical parameters were confirmed. For TS/ACF combined treatment, when doped Si was 20%(mole ratio),calcinations temperature was 750℃,oxygen flow rate was 0.09 m3/h, the degradation was 75.9% in 3 minutes, which reached the highest point. For TF/ACF combined treatment, when doped Fe was 0.07%,calcinations temperature was 900℃, oxygen flow rate was 0.08 m3/h, the degradation was 85.48% in 3 minutes, which was the best. The combined treatment degradation was high when pH value was 6, and it was low when pH value was 10. Besides, the conductivity,the initial volume and concentration of solution also had impact on the combined treatment. Both of these two photocatalytic composite material showed perfect performance in cycle reaction, the degradation was bigger than 90% when the material cycled for the fourth time. The photocatalytic composite material combined treatment also worked when treating other pollutants, such as phenol. And the result was good when treating the real refinery wastewater. In addition, the combined synergetic mechanism was analyzed simply. The synergistic effect attributes to the adsorption and photo-catalysis of photocatalytic composite material. Because the adsorbed ozone is apt to react with the electron on the surface of Titanium Dioxide, the chance of the electron reacts with the cavity decreases. So the photons efficiency of photocatalysis increases. That's the reason why the combined treatment takes on good performance.