Study On The Influencing Factors Of The Degradation Of Volatile Organic Compounds Benzene By Air Dielectric Barrier Discharge (DBD) Plasma

The emission of volatile organic compounds（VOCs） with extensive sources is is the formation of "haze" of the main precursor pollutants and harmful to human health and environment. Developing efficient processing technology and equipment to become the focus of attention in the field of engineering.The nonthermal plasma process has such advantages as high removal efficiency,nonselective, wide using range and so on. In this paper, the benzene was chosen as target pollutants and a DBD reactor was set up to remove benzene in air. The effects of energy input density（SIE）, initial concentration of benzene and discharge zone length on the degradation of benzene were studied in this paper. The concentration of benzene in the exhaust gas reduces along with the increase of the discharge area length and SIE. And the degradation rate of benzene reduces along with the increase of the initial concentrations of benzene. Moreover, this paper discusses ecological comprehensive toxicity of exhaust emissions by studying the stress effects of the absorbing liquid of exhaust gas on chlorella. The results showed that the variety of by-products generated in the process of degradation of benzene has a strong overall toxicity, even more than untreated benzene gas. And the TVOC generated in different discharge conditions exhibit different biological toxicity.To further investigate the degradation of benzene by DBD plasma collaboration technology and the constitute features of intermediates, the study coupled the DBD plasma technology and ACF/TiO₂ in the discharge area and rear, respectively. These can lay the experimental foundation for the development of DBD plasma collaboration technology. When the ACF and ACF / TiO₂ loaded in the rear end of the plasma, it found that in conditions of 28V’s power input voltage, the ACF loaded in the rear end of the plasma can attain best degradation performance; in conditions of 18V’s power input voltage, the ACF/TiO₂ loaded in the rear end of the plasma can attain best degradation performance and in conditions of 23V’s power input voltage, two experimental conditions can get a similar effect of benzene degradation.When the ACF and ACF / TiO₂ loaded in the discharge area, it found that in conditions of 18V’s and 23V’s power input voltage, the ACF and ACF / TiO₂ loaded in the discharge area can attain better degradation performance than loaded in the rear end of the plasma. However, in conditions of 28V’s power input voltage, the ACF and ACF / TiO₂ loaded in the discharge area cannot attain ideal degradation performance of benzene due to the ablation of ACF and ACF / TiO₂ in discharge area.It was found that a large number of byproducts deposited on the surface of ACF and ACF / TiO₂ was main factor leading to the decline of benzene removal. And this paper discussed about the degradation mechanism of benzene.