微气泡臭氧化强化吸收-氧化处理高浓度乙酸乙酯气体

采用微气泡臭氧化处理模拟高浓度乙酸乙酯气体，考察了强化吸收与氧化去除体系的性能、反应动力学及氧化反应的过程。结果表明，微气泡臭氧化能明显提高易溶性乙酸乙酯气体吸收-氧化处理的效率，乙酸乙酯气体整体平均去除率高于96%，氧化矿化率可达到90.22%，高于普通气泡臭氧化过程的63.25%和47.15%。微气泡臭氧化可提高臭氧利用效率，累积臭氧利用率可达到85.5%，高于普通气泡中的58.6%；同时，还可强化·OH氧化反应，提高臭氧化反应效率，反应中臭氧消耗量与乙酸乙酯TOC去除量比值(R)仅为1.04 mg∙mg⁻¹，明显低于普通气泡臭氧化过程的1.53 mg∙mg⁻¹。微气泡臭氧化处理中，乙酸乙酯传质吸收和氧化矿化反应均符合表观零级动力学方程，氧化矿化速率与传质速率基本平衡。以上结果表明，微气泡臭氧化处理可实现长期稳定高效处理乙酸乙酯气体。

Treatment of high-concentration ethyl acetate gas by enhanced absorption and oxidation using microbubble and ozonation

The ethyl acetate removal performance, dynamics and oxidation reaction process in microbubble ozonation enhancing absorption-oxidation process were investigated. Results showed that microbubble ozonation could increase absorption and oxidation efficiency of soluble ethyl acetate gas. The total average removal efficiency of ethyl acetate was higher than 96% and the average mineralization efficiencies of ethyl acetate was 90.22% using microbubble ozonation, which were higher than 63.25% and 47.15% respectively using common bubble ozoantion. The ozone utilization efficiency was increased in microbubble ozoantion and the cumulative ozone utilization efficiency reached to 85.5%, which was higher than 58.6% in common bubble ozoantion. The ozonation reaction efficiency was also improved in microbubble ozonation due to enhanced ·OH oxidation. The ratio of ozone consumption to TOC removal of ethyl acetate was only 1.04 mg∙mg−1, which was lower than 1.53 mg∙mg−1 in common bubble ozonation. Both absorption and oxidation process of ethyl acetate were in accordance with the apparent zero order dynamics in microbubble ozonation. The oxidation mineralization rate of ethyl acetate was almost the same with its absorption rate in microbubble ozonation and this could realize long-term stable and efficient treatment of ethyl acetate gas.