微泡强化臭氧传质及其对产生羟基自由基的影响  

Intensification of Ozone Mass Transfer by Microbubbles and Its Effect on Hydroxyl Radical Production

作　　者：程雯 全学军[1] 罗丹[1] 李瑞恒[1] 杨鲁 

机构地区：[1]重庆理工大学化学化工学院,重庆400054 [2]重庆市生活垃圾资源化处理协同创新中心,重庆401331

出　　处：《化学反应工程与工艺》2017年第5期458-465,共8页Chemical Reaction Engineering and Technology

基　　金：国家自然基金项目(21176273);重庆市百名工程技术高端人才项目(2014);重庆市生活垃圾资源化处理协同创新中心资助项目(Shljzyh2017-003);重庆理工大学研究生创新基金(YCX2016239)

摘　　要：为提高臭氧在水中的传质效率,设计了微泡反应器强化臭氧传质,考察了在该反应器中不同压力、温度、臭氧进口浓度及流量对液相中臭氧浓度以及羟基自由基产生的影响。结果表明,液相中臭氧浓度受压力影响较小,反应器压力增加可使液相中羟基自由基产生量增大;进口臭氧浓度及流量的增加,可使液相中臭氧浓度以及羟基自由基产生量增大;液相温度升高导致液相中臭氧浓度降低,但可以提高液相中羟基自由基产生量。同时还将该微泡反应体系与传统鼓泡反应器进行对比研究,结果表明,微泡反应器能有效地提高传质效率,液相中臭氧浓度达到稳定状态时约为14 mg/L,比鼓泡反应器高约10%。微泡加压反应器中羟基自由基产生效果更好,臭氧通入5 min,微泡反应器中羟基自由基浓度高达121.45×10^(-6)mol/L,比鼓泡反应器提高了约11倍,且微泡反应器中废水脱色及矿化效率都高于传统鼓泡反应器。In order to improve the mass transfer efficiency of ozone in water, a microbubble reactor was designed to enhance the mass transfer of ozone. The effects of different reactor pressure, temperature, ozone inlet concentration and flow rates on the ozone concentration in the liquid phase and the generation of hydroxyl radicals were investigated. The results indicated that ozone concentration in liquid phase was less affected by the pressure, but the concentration of hydroxyl radicals in liquid phase increased with the increase of reactor pressure. With the increase of inlet ozone concentration and the flow rate, the ozone concentration in the liquid phase increased and more hydroxyl radicals were generated. Increasing the liquid temperature resulted in a reduction of the ozone concentration in the liquid phase, but it increased the amount of hydroxyl radicals produced in the liquid phase. The microbubble reaction system was also compared with the traditional bubbling reactor. The results showed that the microbubble reactor could effectively improve the mass transfer efficiency. When the ozone concentration in the liquid phase reached a steady state, it was about 14 mg/L, which was about 10% higher than that of a bubbling system. The hydroxyl radicals in the bubble reactor were more effectively generated than that in the traditional bubbling reactor. After 5 minutes of ozonation, the hydroxyl radical concentration in the microbubble reactor was as high as 121.45×10^-6 mol/L, which was about 11 times higher than that of the bubbling reactor, and both the decolorization and mineralization efficiency of wastewater in the microbubble reactor were higher than that of the traditional bubbling reactor.

关 键 词：微泡反应器 臭氧羟基自由基 传质废水 

分 类 号：TQ051.7[化学工程]