Advanced oxidation and disinfection using ultraviolet light

该提案将分为两个部分：（1）开发在线通量（紫外线剂量）测量系统-我们发现，在254 nm处，水中氯物质（次氯酸和次氯酸根离子）的紫外线（UV）光解具有高量子产率（接近1.0）。事实上，在某些情况下，在溶解的有机物存在下，量子产率可以大得多。该光化学反应的某些方面仍需确定，例如详细检查产物和中间体，以及使用中压紫外灯（多色紫外输出）与低压灯（254 nm单色）的效果。我们建议在下一个拨款期内研究这些方面。在目前的资助期内进行的研究表明，在紫外线消毒范围内的能量密度（紫外线剂量）下，水溶液中的氯物质会发生光解。拟议的工作将推进到一个实用的协议，可用于提供在线监测的紫外线消毒反应器。我们亦会研究利用氯气光解系统作为“高级氧化”工序，以减少污染。(2)紫外线空气处理-使用紫外线（UV）光对气流进行消毒，被证明对于建筑空气系统、医院手术室和恢复室以及家庭空气循环系统中的空气处理非常有吸引力。不幸的是，目前没有关于UV空气消毒系统的认证的法规，也没有用于确定UV空气消毒系统传递的能量密度（UV剂量）的任何协议。与W博士合作。B。Kindzierski在埃德蒙顿AB的Seacor环境，我们建议制定一个协议，生物剂量学实验，旨在确定通量（紫外线剂量）提供的紫外线空气消毒系统。我们将建立一个实验空气管道，其中包含紫外线灯，空气流速和紫外线灯功率可以仔细控制和测量。

The Proposal will be in two parts: (1) Development of an online fluence (UV dose) measurement system - We have found that the ultraviolet (UV) photolysis of chlorine species (hypochlorous acid and hypochlorite ion) at 254 nm in water has a high quantum yield (near 1.0). Indeed, under certain circumstances, the quantum yield can be much larger in the presence of dissolved organic matter. There are some aspects of this photochemical reaction that still need to be determined, such as a detailed examination of the products and intermediates and the effect of using a medium pressure UV lamp (polychromatic UV output) as opposed to a low pressure lamp (monochromatic at 254 nm). We propose to examine these aspects in the next grant period. Research in the current grant period has shown that the photolysis of chlorine species in aqueous solution occurs at fluences (UV doses) in the range of UV disinfection. The proposed work will carry this forward to a practical protocol that can be used to provide online monitoring of UV disinfection reactors. We will also explore the use of the chlorine photolysis system as an "Advanced Oxidation" process for pollution abatement. (2) UV Air Treatment - The disinfection of air streams using ultraviolet (UV) light is proving to be very attractive for the treatment of air in building air systems, hospital operation and recovery rooms and home air circulation systems. Unfortunately, there are at present no regulations concerning the certification of UV air disinfection systems nor any protocols for the determination of the fluence (UV dose) delivered by a UV air disinfection system. In collaboration with Dr. W. B. Kindzierski at Seacor Environmental in Edmonton AB, we propose to develop a protocol for biodosimetry experiments aimed at determining the fluence (UV dose) delivered by a UV air disinfection system. We will set up an experimental air duct containing UV lamp(s), where the air flow rate and UV lamp power can be carefully controlled and measured.