Degradation of gaseous dioxin-like compounds with dielectric barrier discharges.
Developing effective technologies to reduce dioxin emissions has become an important issue in the research and industrial fields. In this study, a dioxin-containing gas stream generating system was applied to evaluate the effectiveness of dielectric barrier discharge (DBD) plasma technology for the destruction of dioxin-like compounds. The results indicate that the destruction efficiencies of dioxin-like compounds achieved with DBD plasma strongly depend on the composition of the simulated gas stream. As the DBD plasma is operated with the simulated gas stream containing 20% water vapor, around 74% PCDDs and 89% PCDFs can be destroyed by DBD plasma. UV, electrons, and OH radicals are generated via the DBD plasma process and react with the dioxin-like compounds in the gas stream. Dechlorination via UV and electrons and decomposition via OH radicals occur at the same time and significantly increase the destruction efficiency of PCDD/Fs in the presence of oxygen and water vapor. Additionally, the total toxicity destruction of dioxin-like compounds with the input energy of 1 kJ increases from 1.47 to 3.06 ng-TEQ(WHO) as the water vapor is incorporated into the gas stream.
Hung
Pao Chen
PC
Graduate Institute of Environmental Engineering, National Central University, Chungli 320, Taiwan.
Chang
Shu Hao
SH
Chi
Kai Hsien
KH
Chang
Moo Been
MB
D004147:Dioxins / Q000737:chemistry*; D004560:Electricity; D058626:Plasma Gases
D004147:Dioxins; D058626:Plasma Gases