Photolysis of low concentration H@d2S under UV/VUV irradiation emitted from microwave discharge electrodeless lamps

The photolysis of simulating low concentration of hydrogen sulfide malodorous gas was studied under UV irradiation emitted by self-made microwave discharge electrodeless lamps (i.e. microwave UV electrodeless mercury lamp (185/253.7nm) and iodine lamp (178.3 /180.1/183/184.4/187.6/206.2nm)). Experiments results showed that the removal efficiency (^h@dH@d2@dS) of hydrogen sulfide was decreased with increasing initial H@d2S concentration and increased slightly with gas residence time; H@d2S removal efficiency was decreased dramatically with enlarged pipe diameter. Under the experimental conditions with pipe diameter of 36mm, gas flow rate of 0.42standardls@u-@u1, ^h@dH@d2@dS was 52% with initial H@d2S concentration of 19.5mgm@u-@u3 by microwave mercury lamp, the absolute removal amount (ARA) was 4.30^kgs@u-@u1, and energy yield (EY) was 77.3mgkWh@u-@u1; ^h@dH@d2@dS was 56% with initial H@d2S concentration of 18.9mgm@u-@u3 by microwave iodine lamp, the ARA was 4.48^kgs@u-@u1, and the EY was 80.5mg kWh@u-@u1. The main photolysis product was confirmed to be SO@d4@u2@u- with IC.