【作者】 张岍；

【导师】 李朝林；

【作者基本信息】 哈尔滨工业大学 ， 环境工程， 2008， 硕士

【摘要】 20世纪90年代以来,TiO₂光催化在环境保护领域内的水和气相有机、无机污染物的光催化去除方面取得了较大的进展,被认为是一种极具前途的环境污染深度净化技术。在众多半导体光催化剂中,TiO₂以其无毒、催化活性高、氧化能力强、稳定性好等特点而研究最多和最为常用。本文主要研究了利用光纤传输紫外光进行光催化灭活大肠杆菌能力的研究。针对现有技术的不足,我们提出了光纤传导紫外光催化技术的新方法。该技术克服了普通紫外光催化技术的诸多弊端,是一种理想的饮用水安全催化技术。该技术利用汇聚系统将紫外光发生器产生紫外光汇聚于光纤聚结位置,再通过光纤导入水中,并在发光端处发散释放,达到紫外光催化的效果。本项新技术有如下优点:实现了紫外灯与消毒系统的分离,既容易更换紫外灯,又有效消除了因灯管的承压而潜在的汞二次污染,实现紫外光在反应器中的均匀分布,既消除了因紫外线分布不均而产生的消毒盲区,又有效缩短了水力停留时间,从而显著提高了光催化效率和单位时间水处理量。作者通过试验,得到了单根光纤头的发光规律,并且得到了单根光纤头的处理效率的最优值。根据所得光纤头的发光规律的数据,对反应容器内的光纤头分布进行优化,制成反应容器。研究了该项新设备紫外杀菌对水样大肠菌群数的灭菌效果,光催化杀菌时光催化剂的最佳投加量以及灭菌过程中光催化杀菌与紫外杀菌的关系,为进一步的实验打下基础。更多还原

【Abstract】 Since the 1990s, TiO₂ photocatalytic in environmental protection, water and gas organic and inorganic pollutants contral has made considerable progress,and it is considered a great depth of the environmental future of purification technology. Among the many semiconductor photocatalyst, TiO₂ which is non-toxic, high activity and stability, has been used and research.. This article took developing photocatalytic reactor may be used in the water treatment process as the goal.We apply optical fibers to transfer ultraviolet ray in photocatalyst, since there are several problems in traditional ultraviolet photocatalytic technique Accordingly, against those limitations, we propose a new highly efficient, reliable, and economical method, named quartz optical fibre transfering uv photocatalytic technique. The working principle of the experimental setup is that ultraviolet rays are gathered by the lamp shade to converge a light point. The UV light point is the light source of the optical fiber cluster. Ultraviolet rays can be transferred into the water through the side-glowing optical fibers averagely, to ensure the uniformity of the UV intensity in the water. Additionally, combination of new method and chlorination disinfection can indirectly decrease the dose of chlorine, thus the disinfection by-products can be reduced. The new technique must become more and more widespread in disinfecting feed water.This paper presents first results on water photocatalytic using this new type UV setup. Its suitability for application could be shown in experiments with total colibacillus count as risk group. The author had got the optimized distribution of the optical fibers in the water in bench-scale study and the optimal dosing quantity of photocatalytic. Undoubtedly, the research of new type low-pressure UV photocatalytic setup makes great progress in the innovation of the traditional techniques and provides a promising approach to disinfection treatment of water.更多还原