微波强化臭氧氧化降解苯酚动力学研究

研究微波强化臭氧（MW/O3）系统下主要影响因素如臭氧投量、微波功率、pH值及温度等对苯酚降解效果和动力学的影响.结果表明：在单独的微波辐射下苯酚去除率很小,在复合氧化过程MW/O3工艺中有显著的提高,表明微波对臭氧氧化存在明显的强化作用；在单独微波辐照或者臭氧氧化工艺和MW/O3强化氧化系统中苯酚的降解均符合拟一级动力学关系,其中MW/O3氧化系统苯酚去除的速率常数增强因子可以达到3.6,降解机理类似臭氧氧化苯酚的降解过程,羟基自由基氧化机制为主.通过实验推导出简化的与pH值、臭氧投量、微波功率和反应温度等因素相关的苯酚降解动力学模型.

Kinetics of phenol degradation in water using microwave/O3 system

The mainly influential factors on the removal rate and synergetic kinetics of phenol degradation in water by using the microwave enhanced ozonation (MW/O3) system were studied. Results showed that the removal rate of phenol degradation was lower under individual microwave ultrasonic radiation, while it was significantly enhanced in the combined MW/O3 system. There existed obviously enhanced effects in the MW/O3 process. In all cases, the degradation of phenol followed pseudo-first-order kinetics reaction, with the enhancement factor of the pseudo-first-order kinetics constant being around 3.6 in the combined MW/O3 system. The phenol degradation mechanism in MW/O3 system was greatly similar with that in ozonization oxidation process, and hydroxyl radicals oxidation was dominant. A simplified model for phenol degradation kinetics was derived by accounting for the contribution of pH value, ozone dose, microwave power and reaction temperature in the MW/O3 system.