Jabesa Abdisa, Ghosh Pallab
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
J Environ Manage. 2016 Sep 15;180:476-84. doi: 10.1016/j.jenvman.2016.05.072. Epub 2016 Jun 6.
Ozone microbubbles (OMBs) were used to remove diethyl phthalate (DEP) from water in a pilot plant. The removal of DEP and the mineralization efficiency were investigated under various reaction conditions. The removal of DEP by OMBs was very effective at the high pH and high ozone generation rates. Almost complete mineralization of DEP could be achieved at the high pH. The contribution of OH was computed by using a hydroxyl radical scavenger (i.e. t-BuOH). In neutral and alkaline media, the reaction of DEP with OH dominated over its direct reaction with ozone. The overall oxidation reaction fitted a second-order kinetic model. The overall rate constant and the volumetric mass transfer coefficient of ozone slightly increased with increasing pH. The results indicate that the OMBs were efficient in terms of the reduction of concentration of DEP and its complete mineralization.
在中试装置中，采用臭氧微泡（OMBs）去除水中的邻苯二甲酸二乙酯（DEP）。研究了在各种反应条件下DEP的去除情况和矿化效率。在高pH值和高臭氧产生速率下，OMBs对DEP的去除非常有效。在高pH值下，DEP几乎可以完全矿化。通过使用羟基自由基清除剂（即叔丁醇）来计算OH的贡献。在中性和碱性介质中，DEP与OH的反应比其与臭氧的直接反应更占主导。总的氧化反应符合二级动力学模型。臭氧的总速率常数和体积传质系数随pH值的增加而略有增加。结果表明，OMBs在降低DEP浓度及其完全矿化方面是有效的。
