Oxidation of methyl methacrylate from semiconductor wastewater by O3 and O3/UV processes.
This study investigated the oxidation of methyl methacrylate (MMA) by sole ozonation and ozone/UV treatments. The semi-batch ozonation experiments were proceeded under different reaction conditions to study the effects of ozone dosage and UV radiation on the oxidation of MMA. The experimental results indicated that both the oxidation of MMA by the sole ozonation and O3/UV processes can completely decompose MMA to form the following intermediates within 30 min reaction time. To increase the applied ozone dosage can significantly raise the removal efficiency of MMA. However, the mineralization of MMA via the direct oxidation reaction of molecular ozone was slow, while introducing the UV radiation can promote the mineralization rate of MMA. In addition, the pH value of the oxidized solution in the O3/UV treatment decreased lower than that in the sole ozonation treatment of about 1 unit. The possible scheme of the decomposition pathway of MMA under the ozonation process is proposed in this study. Formic acid and acetic acid were found to be the main ozonated intermediates.
Shang
Neng-Chou
NC
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan. shangnc@ntu.edu.tw
Chen
Yi-Hung
YH
Ma
Hwong-Wen
HW
Lee
Chi-Wei
CW
Chang
Cheng-Hsin
CH
Yu
Yue-Hwa
YH
Lee
Chien-Hsien
CH
D019342:Acetic Acid; D005561:Formates; D007220:Industrial Waste / Q000517:prevention & control*; D020366:Methylmethacrylate / Q000737:chemistry* / Q000528:radiation effects*; D010084:Oxidation-Reduction; D010126:Ozone; D010782:Photolysis; D012666:Semiconductors; D014466:Ultraviolet Rays
D005561:Formates; D007220:Industrial Waste; C030544:formic acid; D020366:Methylmethacrylate; D010126:Ozone; D019342:Acetic Acid