Laboratoire de Génie Chimique, UMR CNRS 5503, Université de Toulouse, INPT, ENSIACET, 4, Allée Emile Monso, BP 84234, 31432 Toulouse Cedex 4, France.
Water Sci Technol. 2012;66(9):2020-6. doi: 10.2166/wst.2012.385.
A hybrid process combining adsorption and ozonation was examined as an alternative treatment for odorous volatile organic compounds (VOCs). Methyl ethyl ketone (MEK) was chosen to study the influence of operating parameters. Two synthetic aluminosilicates (faujasite-Y and ZSM-5) were tested for adsorption and reactivity with ozone. The adsorption equilibrium measurement on both adsorbents showed that adsorption performance depends on temperature but is not sensitive to relative humidity, due to the hydrophobic properties of the materials. Adsorbed VOCs were oxidized at low temperature when ozonated flow was sent to the reactor. Regeneration of the fixed bed was achieved at the same time, releasing mainly CO(2) and H(2)O. Intermediates of oxidation, such as 2,3-butanedione and acetic acid, were identified, leading to incomplete mineralization. The influence of concentration and humidity are discussed. Four successive cycles were tested: after the first adsorption/ozonation cycle, the adsorption efficiency was not affected during subsequent cycles. These results show that the same sample of adsorbent can be used in the treatment process for a long time. Ozonation regeneration is a promising process for VOC removal.
一种将吸附和臭氧化相结合的混合工艺被考察作为处理恶臭挥发性有机化合物（VOCs）的替代方法。选择甲乙酮（MEK）来研究操作参数的影响。两种合成的铝硅酸盐（Y 型沸石和 ZSM-5）被测试用于吸附和与臭氧的反应性。对两种吸附剂的吸附平衡测量表明，吸附性能取决于温度，但对相对湿度不敏感，这是由于材料的疏水性。当臭氧化流被送到反应器时，吸附的 VOCs 在低温下被氧化。同时实现了固定床的再生，主要释放 CO(2)和 H(2)O。氧化的中间体，如 2,3-丁二酮和乙酸，被鉴定出来，导致不完全矿化。讨论了浓度和湿度的影响。测试了四个连续的循环：在第一个吸附/臭氧化循环之后，在随后的循环中吸附效率没有受到影响。这些结果表明，相同的吸附剂样品可以在处理过程中长时间使用。臭氧化再生是一种有前途的 VOC 去除工艺。
