The Research On The Catalytic Ozonation Of VOCs In Cooking Oil Fume

The pollution of the catering oil fume has become increasingly serious with the development of the catering industry, it has become the third largest source of air pollution following motor vehicle pollution and industial pollution. However, most current research is only for the removal of soot particulate, the study of the removal of VOCs is rare. On the basis of charged mist fume purification, this topic made use of Mn2+/O3、Fe3+/O3/UV system to study the removal of VOCs in catering fume, then chose Mn2+/O3 to carry out the experiment on anolog fume purification, a typical VOCs butyraldehyde was chosen as the target pollutant.The removal activity of gas phase butyraldehyde by Mn2+/O3 system was studied and the effects of reaction conditions on the catalytic activity of Mn2+/O3 system were also investigated. The results showed that, Mn2+/O3 showed good butyraldehyde removal activity. The removal efficiency of butyraldehyde increased with the decrease of the concentration of butyraldehyde and the rise of [O3]/[butyral], first increased then reduced with the rise of p H、Mn2+ concentration and temperature, there was an optimal figure of the three. When the catalyst concentration was 1 m M, p H was 5, the initial concentration of butyraldehyde was 50 m L/m3, [O3]/ [butyraldehyde] was 0.2, temperature was 25±1 ℃, the removal rate of butyraldehyde was 94.67%, butyraldehyde mineralization rate reached 91.8%, almost completely removed butyral.The removal activity of gas phase butyraldehyde by Fe3+/O3/UV system was studied and the effects of reaction conditions on the catalytic activity of Fe3+/O3/UV system were also investigated. The results showed that, Fe3+/O3/UV showed good butyraldehyde removal activity, the removal efficiency of butyraldehyde increased with the rise of p H, the increase of concentration ratio of [O3]/[butyraldehyde] and light intensity were in favor of the removal of butyraldehyde, the degradation rate first increased then decreased with the increase of the concentration of Fe3+, reached the optimal removal activity when the concentration of Fe3+ was 1 m M, the increase of the intial concentration of butyraldehyde led to the decrease of degradation rate. When the catalyst concentration was 1 m M, p H was 4.5, the initial concentration of butyraldehyde was 50 m L/m3, [O3]/ [butyraldehyde] was 0.2, light intensity was 3671.4 μw/cm2, at room temperature, the removal rate of butyraldehyde was 95.5%, butyraldehyde mineralization rate reached 62.8%.Compared the removal activity of the Mn2+/O3 and Fe3+/O3/UV system above, chose the Mn2+/O3 system to carry out the degradation of VOCs in actual working conditions finally. The results showed that, when p H was 5.5, the initial concentration of VOCs was 115 m L/m3, the concentration of the catalyst was 2 m M, the amount of wind was 1500 m3/h, the degradation rate and mineralization rate of the analog fumes were 78.7% and 51.3%, respectively. The system still kept good degration activity after 3 cycles.