Characteristics of UV Photolysis Reactor and Its Application for H2S Treatment

Abstract

Malodorous gas is an important air pollutant which can damage people’s health and bring uncomfortable experiences. H2S is a common malodorous gas in people’s living environment. This work proposed a UV photolysis reactor with double-tube used for H2S contral. Performance of the reactor is evaluated by O3 generation and H2S removal. The results show that, the UV photolysis reactor is stable and produces O3 with high efficiency. The reaction conditions of lower humidity and higher input energy are benefit for O3 generation. 214 mg m−3 of O3 is produced in the UV photolysis reactor with relative humidity of 20% and input energy of 12 W at the gas flow of 1 L min−1. H2S can be decomposed efficiency in the UV photolysis process because of the high energy of UV light and O3 oxidation. For the UV photolysis reactor with the input energy of 1.5 W, almost 100% of H2S with the concentration of 8 mg m−3 can be decomposed. In the UV photolysis reactor, a higher humidity will lead to decompoe more H2S because of the HO generation from H2O decomposed by UV light.