UV/Chlorine advanced oxidation process for water remediation: Process fundamentals

紫外线(UV)对水消毒中常用的活性氯(Cl2)的光解非常有效，会产生高度氧化的活性物种，如羟基和氯自由基。这些自由基与多种水化学污染物反应非常迅速，包括杀虫剂、药物、内分泌干扰物、挥发性有机溶剂、藻类毒素，并启动其降解过程。UV/Cl2工艺比UV/H2O2工艺更具成本效益，后者目前应用于水中化学微污染物的修复。它在水处理中的实施还显示了这样一个优点，即水处理厂使用氯对分配给人的水进行最终消毒，因此不需要购买其他氧化剂(如过氧化氢)并将其储存在现场。对这一过程的研究很少，在已发表的文献中也报道了相互矛盾的科学信息。这项研究将探讨工艺原理，并将确定氯自由基对最常见的水化学污染物的反应性。将开发使用激光闪光光解的具体方法来研究这些反应，并将产生可靠的数据。通过这项研究确定的参数将与动力学模型一起用于确定所需的紫外光设备和紫外光系统在处理受污染水中微污染物方面的性能。这项研究是为了支持特洛伊技术公司的饮用水处理新技术开发。

Ultraviolet (UV) radiation is very effective at the photolysis of active chlorine (Cl2) commonly used in water disinfection, with the generation of highly oxidizing reactive species such as hydroxyl and chlorine radicals. These radicals react very fast with a wide range of water chemical pollutants, including pesticides, pharmaceuticals, endocrine disrupting compounds, volatile organic solvents, algal toxins, and initiate their degradation processes. The UV/Cl2 process is more cost-effective than the UV/H2O2 process, which is currently applied to water remediation from chemical micropollutants. Its implementation to water treatment presents also the advantage that the water treatment plants use chlorine for the final disinfection of water distributed to people, thus, no other oxidant (e.g., H2O2) would be purchased and stored on site. The process is very little studied and conflicting scientific information is reported in the published literature. This research will investigate the process fundamentals and will determine the reactivity of chlorine radicals toward the most common water chemical pollutants. Specific methods using laser flash photolysis will be developed to investigate these reactions and reliable data will be generated. The parameters determined through this research will be used with kinetic models to determine the UV equipment needed and the performance of the UV systems in treating the micropollutants in contaminated water. The research is conducted in support of Trojan Technologies' new technology development for drinking water treatment.