KISHIMOTO Naoyuki Kyoto University, Graduate School of Engineering, Instructor, 工学研究科, 助手 (00293895)
MIYATA Jun Kyoto University, Graduate School of Engineering, Instructor, 工学研究科, 助手 (80273481)
In this study, treatment characteristics and reaction mechanisms of advanced oxidation processes for the direct degradation of humic acid, trichloroethylene (TCE), and 1,1,1-trichloroethane (1,1,1-TCE) were examined.
Decoloration process of humic acid by ozonation was described by Michaelis-Menten's formula, whose rate constant of reaction and Michaelis constant were proportional to the rate of ozonation and the initial concentration of humic acid respectively. Ozonation for 30 minutes degraded 91.7% of the initial TCE and none of 1,1,1-TCE.But the ozone-hydrogen peroxide process for 30 minutes could degrade 22.2% of 1,1,1-TCE and the rate constant of reaction of TCE was 1.5 times larger than that with the ozonation process. Ozone-UV process could decolor humic acid solution, furthermore it could decompose 95% of the initial total organic carbon (TOC) with UV intensity not less than 4.7 W.The ratio of decomposed TOC to the initial TOC reached two times larger than that with the ozonation process. This was thought to be caused by oxidative decomposition of organic acids, which was inferred by the transition of pH.The ozone-UV process for 30 minutes could degrade 97.8% of the initial TCE,and 53.2% of the initial 1,1,1-TCE.As a result, it was clarified that the advanced oxidation processes, especially ozone-UV process, were effective to the degradation of slowly biodegradable organic matters.