介质阻挡放电反应器降解邻二甲苯的特性研究

Studies on the characteristics of o-xylene degradation by dielectric barrier discharge reactor

采用介质阻挡放电(DBD)降解常压下流动态的邻二甲苯模拟废气,系统地考察了放电极值电压,气体的初始质量浓度、停留时间以及相对湿度等工艺参数对邻二甲苯降解的影响,并初步探讨了邻二甲苯的降解产物.实验研究结果表明:在7.0kV的放电极间电压下,邻二甲苯的初始质量浓度为1 500mg/m3,停留时间为9s,其去除率可达到80%以上.降解产物主要为CO2、H2O以及苯甲酸、苯乙酸、苯乙醛等有机物,并且经降解后产物的生物可生化性得到提高,因而为后续的等离子-生物法联合处理VOCs提供了依据.

Degradation of gas phase o-xylene by the dielectric barrier discharge （DBD） was investigated. The effects of the main parameters on the o-xylene removal efficiency, such as peak voltage, initial concentration of o-xylene , residence time and relative humidity, were studied. The byproducts of o-xylene oxidation by the DBD reactor were also analyzed. The results showed that the o-xylene removal efficiency was more than 80 % ,when the peak voltage was controlled at 7.0 kV, with the inleto-xylene concentration of 1 500 mg/ma, under the residence time of 9 s. The main byproducts were CO2, H20 and some organics, such as benzoine acid. phenylacetic acid and phenylacetaldeyde. The BODs/COD ratio of the wastegas increased after degradation by the DBD reactor and the biologicalability of the wastegas was improved, which indicated that the biodegradability of waste gas was improved and the DBD reactor could be used as a pretreatment when combined with biological technology.