Dielectric Barrier Discharge for Hydrogen Sulphide Waste Gas Decomposition

Non-thermal plasma is considered to be a suitable treatment technology for H2S waste gas pollution, but it still need to improve the energy efficiency. This work proposed a cylindrical DBD reactor used for H2S decomposition. Performance of the reactor is evaluated by O-3 generation and H2S removal. The results show that the DBD can produce O-3 with high efficiency at high specific input energy or low humidity. With regard to the energy yield of ozone generation, the G-value is about 2.29 molecules (100 eV)(-1) at the relative humidity of 18%. The H2S removal efficiency increases as the specific input energy increases, but a high humidity can reduce the H2S decomposition. The H2S with the concentration of 8 mg M-3 can be 100% removed at the specific input energy of 4.5 J L-1, but for ozone used only, 65% removal efficiency can be realized at the ozone concentration of 65 mg m(3). It is can be concluted that, in addition to the ozone, other active species such as electron, ions and free radicals also play an important role in the degradation of H2S.