Research On Decontamination Of Low Concentrations Sulfureted Hydrogen Using Dielectrical Barrier Discharge Combined With Photocatalyst

Through the domestic and international research it could be found that the removal rate of the malodor can be effectively improved by introducing the photocatalytic technology into the process of decontamination using dielectrical barrier discharge with low concentrations malodorous waste gas. And this method also can reduce the energy consumption and secondary pollution.In this paper, the decontamination of low concentrations malodorous waste gas using dielectrical barrier discharge combined with the TiO2 photocatalyst in nanometre have been investigated by experimentation. This experiment selected H2S as study subject, and investigated the mainly factors which remarkably affected the removal rate of H2S by using dielectrical barrier discharge reactor, such as voltage, residence time and the initial concentration; Some other factors such as the TiO2 photocatalyst in nanometre and the relative humidity of the waste gas also be investigated for the further experimental research; In order to promote the application of this device, not only the factors such as energy use and pressure loss, but also the adsorption and the desorption process using non-thermal plasma are been investigated tentatively.The main results indicated:(1) The sort order of these factor which remarkably affected the removal rate of H2S is voltage, the initial concentration and the residence time of waste gas. (2)Under the same conditions, the removal rate of H2S increases with increasing voltage, gas residence time, but decreases with increasing initial concentration. (3)The removal rate of H2S are obviously improved with TiO2 photocatalyst in nanometer, and when the voltage is 22kV, the removal rate with TiO2 photocatalyst in nanometre was advanced by about 11.9%. (4)With the increasing of the relative humidity of the waste gas, the removal rate increased first and then decreases, and it reaches its highest value when gas relative humidity is about 40%. (5)Through the experiment it also can be found that under the condition of low voltage, non-thermal plasma could play a role in the desorption of H2S adsorbed on the surface of the filler; When the voltage goes beyond 18kV, the decompositon will be the major reaction, and the desorption will be significantly weakened.