【摘要】 高浓度挥发性有机物(VOC)气体高效处理技术是大气污染控制领域关注的重点。采用微气泡臭氧化在水介质中通过吸收-氧化过程对高浓度甲苯气体进行处理,考察微气泡臭氧化强化甲苯吸收-氧化去除性能、机理以及水介质pH对该工艺处理效果的影响。结果表明,微气泡能够强化甲苯气体在水介质中的吸收过程,氮气/甲苯微气泡在水介质中的甲苯去除率和吸收量均显著高于氮气/甲苯传统气泡,同时氮气/甲苯微气泡通过产生·OH氧化反应,使得平均甲苯氧化矿化率达到40.97%。微气泡臭氧化在水介质中对甲苯气体具有更高效的去除性能,臭氧/甲苯微气泡处理中甲苯平均去除率为97.08%,甲苯可被完全矿化而几乎无中间产物积累,其平均氧化矿化率为88.56%、平均臭氧利用率为82.54%、臭氧投加量与甲苯矿化量比值为1.26,处理性能显著优于臭氧/甲苯传统气泡处理。水介质pH对臭氧/甲苯微气泡处理甲苯气体具有一定影响,不同pH条件下甲苯气体去除率基本相当,但中性条件下甲苯氧化矿化率最高;碱性和酸性条件下甲苯氧化矿化率有所下降。微气泡臭氧化为高浓度VOC气体高效处理提供了新的解决途径。更多还原

【Abstract】 The effective technology for high concentration volatile organic compound(VOC) gas treatment is a focusof air pollution control. The microbubble ozonation was used to treat high concentration toluene gas in water mediumthrough absorption-oxidation process. The performance and mechanism of toluene removal through an enhancedabsorption-oxidation process with microbubble ozonation, as well as the effect of water medium p H, were studied. Theresults showed that microbubbles could enhance absorption process of toluene gas in water medium. The removalefficiency and absorption amount of toluene in water medium using nitrogen/toluene microbubbles were much higherthan those using nitrogen/toluene conventional bubbles. In addition, ·OH oxidation occurred when using nitrogen/toluene microbubbles, which resulted in an average oxidation mineralization efficiency of 40.97% for toluene. Thehigher efficient removal of toluene gas was achieved with microbubble ozonation in water medium. In this case, theaverage toluene removal efficiency using ozone/toluene microbubbles was 97.08%.The toluene could be mineralizedcompletely without intermediate product accumulation. The average toluene oxidation mineralization efficiency was 88.56% and the average ozone utilization efficiency was 82.54%. The ratio of ozone dosage to toluene mineralizationamount was 1.26. The removal performance of toluene gas using ozone/toluene microbubbles was much better thanthat using ozone/toluene conventional bubbles. The p H of water medium had some effects on the toluene gastreatment with microbubble ozonation. The toluene removal efficiency was almost same at different p Hs of watermedium. However, the toluene oxidation mineralization efficiency reached maximum under neutral p H, and presenteda little decrease under alkaline and acid conditions. Microbubble ozonation provides a new solution for an efficienttreatment of high concentration VOC gas.更多还原