The Developement of Advanced Oxidation Processes for Direct Degradation of Slowly Biodegradable Organic Matters

研究了高级氧化工艺直接降解腐殖酸、三氯乙烯（TCE）和1，1，1-三氯乙烷的处理特性和反应机理臭氧氧化腐殖酸的脱色过程可用Michaelis-Menten公式描述，反应速率常数和米氏常数分别与臭氧氧化速率和腐殖酸初始浓度成正比。臭氧氧化30 min，TCE降解率为91.7%，1，1，1-TCE无降解，而臭氧-H2 O2氧化30 min，TCE降解率为22.2%，反应速率常数是臭氧氧化的1.5倍。臭氧-紫外光降解腐殖酸溶液不仅可以使腐殖酸溶液脱色，而且在紫外光强度不小于4.7W时，腐殖酸溶液中95%的TOC被降解，降解后的TOC占初始TOC的比例比臭氧氧化高出一倍。臭氧-紫外氧化30 min可降解初始TCE的97.8%，初始1，1，1-TCE的53.2%，说明高级氧化工艺，尤其是臭氧-紫外氧化工艺，对生物降解缓慢的有机物有较好的降解效果。

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.