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

降解水中有机痕量化合物的紫外氧化工艺开发

• 批准号: 59850154
• 负责人: SUGAWARA Takuo
• 金额: $ 4.93万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1984
• 资助国家: 日本
• 起止时间: 1984 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59850154/
• 关键词: UV Oxidation; Methanol; TOC Degradation; Ultrapure Water; Recirculation; Ozone; Annular Photoreactor; 接触角; 遠紫外線; 循環(再生)純水; 微量有機物分解; 水の循環利用; 固体表面の汚れ; 気泡塔型光反応装置

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

采用紫外光照射臭氧处理技术对超纯水回流降解水中有机物进行了开发研究。甲醇是一种广泛用于清洁和抗分解的化合物，因此被选为目标化合物。讨论了非均相环形光反应器中紫外光的绝对强度分布，并用接触角法评价了水的清洁度。光源为低压汞灯，发射波长为185 nm和254 nm。该反应器的内壁(外径为33.0 mm)和外壁(内径为89.2 mm)分别配备了一根合成熔融硅管(可传输远紫外光)和一根Pyrex管(内径为89.2 mm)。臭氧以气泡的形式向上喷射进入环空。通过比较光解…的观测结果，发现紫外线的照射使臭氧的自分解速度加快了一百多倍更多的是热自分解。考察了臭氧和氧气浓度、紫外光波长和强度以及液体停留时间对流动体系中甲醇降解率的影响。用半间歇操作研究了高转化率区域的降解特性。紫外光照射臭氧处理效果显著。在40W灯下，甲醇初始浓度为1.24×10~(-2)~(-2)·゜~(-1)，臭氧进口浓度为4.92×~(-4)~(-4)~(-4)·mol/1(氧气流量为4~1/m in)，25℃时，甲醇在4.5小时内完全分解。模拟结果考虑到化学反应步骤控制了整个多相反应，并假定甲醇的反应级数为0.5，甲醇抑制了中间产物甲酸的分解。本研究利用模拟废水对TOC的降解特性进行了研究。较少

项目成果

菅原拓男: 化学工学. 51. (1987)

菅原拓夫：化学工程 51。（1987）

Takuo Sugawara: "Photochemical Engineering for Ultrapure Water Production - UV Sterilization and UV Oxidation -" Kagaku Kogaku. 51. (1987)

菅原拓夫：“超纯水生产的光化学工程 - 紫外线灭菌和紫外线氧化 -” Kagaku Kogaku。

化学工学協会第19回秋季大会講演要旨集. J307. (1985)

化学工程师学会第 19 届秋季会议摘要集 J307（1985）。