O3/UV反应体系的有机物消解动力学模型

为了提高O₃/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O₃分解的SHB机理和O₃、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O₃气体浓度变化，建立了O₃/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O₃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pH下的3种消解途径各自贡献率的仿真结果，发现O₃/UV反应体系的pH对其消解有机物效率具有重要影响.研究显示:在O₃/UV反应体系中，紫外辐射强度和投加的O₃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O₃直接氧化为主，碱性条件下则以自由基间接氧化为主. 

Kinetic Model of Organic Matter Degradation based on O3/UV Reaction System

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 pH values demonstrated the importance of pH 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.