Decomposition Of Benzene, Toluene And Xylene Using Dielectric Barrier Discharge Combined With 185 Nm UV-light

The removal of benzene, toluene, xylene via dielectric barrier discharge (DBD) combined with 185 nm UV light has been investigated. Some parameters such as the toluene initial concentration, input power, gas flow rate and relative humidity (RH) which influence the removal efficiency were studied and the products were analyzed. In addition, the combination of dielectric barrier discharge plasma induced 185 nm UV light photolysis (CDBDP) technology and the catalyst were united with the decompsation of xylene, the pollution of harmful gases such as ozone was reduced.The results showed that CDBDP could enhance benzene degradation efficiency about 10% and increased energy yield about 0.17g/kWh than that of bare DBD degradation. The benzene degradation efficiency increased as RH rose to about 70%, and then gradual declined along with RH continues increased. Under the condition with the optimum humidity of about 70%, gas flow rate of 0.3m3/h, benzene concentration of 250mg/m3 and input power of 103.5W in CDBDP or DBD system and 8W in UV system, benzene removal efficiency was about 79.6,65.5 and 7.9%, respectively.CDBDP could improve toluene removal efficiency by about 20% and increase energy yield by 0.81g/kWh as compared with bare DBD treatment. When toluene initial concentration was 400mg/m3, RH was 65%, gas flow rate was 0.3m3/h, and input power of 103.5W in CDBDP/DBD system and 8W in UV system, the toluene removal efficiency was 84.80,62.18 and 18.98%, respectively. CDBDP could efficiently improved total degree of mineralization.The removal of xylene via CDBDP combined with FeOOH catalyst has been investigated. The catalyst was placed in afterglow section. The results showed that CDBDP/FeOOH could improve xylene removal efficiency by about 5% and increase energy yield by 0.1g/kWh as compared with CDBDP, and could improve xylene removal efficiency by about 15% and increase energy yield by 0.4g/kWh as compared with DBD. When xylene initial concentration was 400 mg/m3, RH was 65%, gas flow rate was 0.3m3/h, and input power of 103.5 W in CDBDP/FeOOH, CDBDP, DBD system and 8W in UV system, the xylene removal efficiency was 80.54,75.05,63.40 and 9.97%, respectively.