微泡对于多环芳烃蒽的降解研究

Study on the Degradation of Polycyclic Aromatic Hydrocarbon Anthracene by Microbubbles

[目的]提出并验证一种水中典型多环芳烃类物质蒽的微气泡处理方法。[方法]基于室内试验揭示了所制备微气泡的尺寸、浓度、传质系数和复氧效能等基本特征,通过对比试验揭示了不同的气流量条件下蒽的降解效果及其动力学过程,并采用荧光指示法阐明了蒽去除的羟自由基氧化机理。[结果]微泡的平均粒径小于1μm,其标准氧体积传质系数比普通曝气高一个数量级。使用空气作为微泡源时,在3 h的试验期间观察到蒽减少93.5%。蒽降解的拟一级动力学常数k随蒽初始浓度增加而减少,随气体流量增加而增加,通过APF法验证坍塌的空气微泡会产生羟基自由基。[结论]微纳米气泡技术作为一种新型的高级氧化技术,可以有效降解水中的蒽。

[Objective]This investigation proposed and verified a micro-bubble treatment method for anthracene,a typical polycyclic aromatic hydrocarbon(PAHs)in water.[Method]Based on laboratory experiments,we studied the basic characteristics such as the particle size distribution,concentration,volumetric mass transfer coefficient and reoxygenation efficiency of the microbubbles.Anthracene degradation and kinetic process under different initial concentration and gas flow were revealed by comparative experiments.This study also illustrated that anthracene degradation mechanism by hydroxyl radical oxidation.[Result]The average bubble size was less than 1μm.The volumetric mass transfer coefficient of microbubbles was an order of magnitude higher than that of ordinary bubbles.A reduction in anthracene of 95.3%was observed during a 3-h test period when air was used as the microbubble source.The pseudo-first-order kinetic constant for the degradation of anthracene,k,decreased linearly with the initial concentration,increased linearly with the gas flow.A fluores-cenceprobe,3′-p-(aminophenyl)fluorescein(APF),was used to verify the generation of the·OH radical by microbubbles.[Conclusion]As an advanced oxidation process,micro bubble technology can effectively degrade anthracene in water.