O_3/UV反应体系的有机物消解动力学模型  

Kinetic Model of Organic Matter Degradation based on O_3/UV Reaction System

作　　者：穆瑞 杨慧中[1] MU Rui;YANG Huizhong(School of Internet of Things Engineering, Jiangnan University, Wuxi 214000, China)

机构地区：[1]江南大学物联网工程学院,江苏无锡214000

出　　处：《环境科学研究》2019年第4期692-699,共8页Research of Environmental Sciences

基　　金：国家自然科学基金项目(No.61773181);中央高校基本科研业务费专项资金资助项目(No.JUSRP51733B)~~

摘　　要：为了提高O_3/UV(臭氧协同紫外)反应体系对有机物的消解效率,降低能源消耗,基于O_3分解的SHB机理和O_3、有机物在紫外辐射下的光解机理,并考虑该反应体系中存在的3种可能的有机物消解途径和反应器出口处O_3气体浓度变化,建立了O_3/UV反应体系的动力学模型.将该模型用于消解过程中有机物消解率变化规律的研究,进一步优化消解工艺参数.结果表明:使用苯酚和乙酸作为目标有机物,以该模型进行仿真,从理论上验证了O_3气体浓度与紫外辐射间存在协同作用和不同工艺参数下所建立模型的灵敏性;将该模型与其他模型、试验测量值进行对比,验证了其优越性和准确性;对比不同p H下的3种消解途径各自贡献率的仿真结果,发现O_3/UV反应体系的p H对其消解有机物效率具有重要影响.研究显示:在O_3/UV反应体系中,紫外辐射强度和投加的O_3气体浓度二者间具有协同作用,同时调节可获得更好的消解效果;在酸性条件下有机物消解以O_3直接氧化为主,碱性条件下则以自由基间接氧化为主.In order to improve the degradation efficiency of organic compounds and reduce energy consumption for the reaction system by using the ozone( O3) and ultra violet radiation( O3/UV) technique,based on the SHB mechanism of O3 decomposition and photolysis mechanism of O3 and organic compounds UV radiation,a kinetic model of O3/UV reaction system was established by studying 3 possible degradation pathways of organic compounds and the concentration change of gas phase O3. The model was used to study the change rules of digestion rate for organic compounds during the degradation process and further to optimize the degradation conditions. Taking phenol and acetic acid as the target organic compounds to conduct the simulation,the sensitivity of the kinetic model to different reaction conditions and the synergy between O3 and UV were verified theoretically. The superiority and accuracy of the proposed model was confirmed via comparison with other kinetic models and actual measurements in digestion experiments. The simulation results for the respective contribution rates of three degradation pathways under different p H values demonstrated the importance of p H value in this reaction system.This study illustrates that there is a synergy between the UV radiation intensity and O3 concentration in the O3/UV system,and high digestion rate can be obtained when they are adjusted together;organic compounds are directly oxidized by O3 under acidic conditions,and by radicals under alkaline conditions.

关 键 词：机理 消解 O3/UV(臭氧协同紫外) 动力学模型 高级氧化技术 

分 类 号：X703.1[环境科学与工程—环境工程]