UV Oxidation-Process Development for Degradation of Organic Trace Compounds in Water

The developmental research是通过applying the ozone treatment with UV irradiation for the recirculation of ultrapure water的有机物质降解的。甲醇被选择为一种目标化合物，因为它被广泛用于清洁和抵抗分解。绝对的紫外线强度分布在不同的模式摄影师中被讨论，而水的清洁性则用接触角度的方法进行了评估。光源是一个低压力水星灯，它发射了185纳米和254纳米射线。该反应器提供了一个用于内壁（外部直径为33.0毫米）的合成荧光硅管（发射远紫外线）和一个用于内壁（内部直径为89.2毫米）的Pyrex管。臭氧被溅起，因为泡沫进入了日历，臭氧的自我分解率被发现比紫外线辐射的一百次还要精确，用对比了光辐射的观察结果 ... More 和热的自我解体。臭氧和氧浓度的影响，紫外线的波长和强度，以及在流动系统中甲醇降解率的液体测试的居住时间。在高转换区域中的退化特征是用半批操作进行研究的。紫外线辐射的臭氧处理具有显著的效果。使用40瓦的灯时，甲醇在4.5小时内完全分解，甲醇的初始浓度为1.24 x <10^（-2）> mol/1，臭氧浓度为4.92 x <10^（-4）> mol/1 （氧的流速为41/分钟），在25 ° C时。观察到的结果被模拟为一种假设，即化学步骤控制了总的异源反应，并根据假定对甲醇浓度的反应顺序为0.5，而甲醇抑制了中间、正式酸的分解。这项研究现在已被研究出以精确地使用模拟废物水的特性分析TOC降解。Less（低）

The developmental research was conducted for the degradation of organic substances in water by applying the ozone treatment with UV irradiation for the recirculation of ultrapure water. Methanol was selected as a target compound since it is widely used for cleaning and resistant to decomposition. The absolute UV intensity distribution was discussed in heterogeneous annular photoreactors, and the cleanness of water was evaluated with a contact-angle method. The light source was a low pressure mercury lamp which emitted the 185nm as well as 254nm ray. The reactor was provided with a synthesized fused-silica tube (which transmitted the far UV light) for an inner wall (outside diameter of 33.0mm) and a Pyrex tube for an outside wall (inside diameter of 89.2mm). Ozone was sparged upwards as bubbles into the annulus.The self-decomposition rate of ozone was found to be facilitated by more than a hundred times with irradiation of the UV rays, by comparing the observed results of the photolytic … More and the thermal self-decompositions. The effects of the ozone and oxygen concentrations, the UV wavelength and intensity, and the residence time of liquid were examined on the degradation rate of methanol in flow system. The degradation characteristics at the high conversion region were studied with a semi-batch operation. The ozone treatment with UV irradiation had a remarkable effect. With the use of a 40W lamp, methanol was completely decomposed within 4.5 hrs under the conditions that the initial concentration of methanol was 1.24x <10^(-2)> mol/1 and the inlet concentration of ozone was 4.92x <10^(-4)> mol/1 (the flow rate of oxygen was 4 1/min) at 25゜C. The observed results were simulated with consideration that the chemical step controlled the overall heterogeneous reaction, and by assuming that the reaction order to methanol concentration was 0.5 and that methanol inhibited the decomposition of the intermediate, formic acid. The research is now undertaken to examine the characteristics of TOC degradation precisely with use of the simulated waste water. Less