UV-based and Ion Exchange Technologies for Drinking Water Treatment Applications

用于饮用水处理应用的基于紫外线和离子交换技术

• 批准号: RGPIN-2015-04873
• 负责人: Mohseni, Madjid
• 金额: $ 2.48万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=685413
• 关键词: UV; based; Ion; Exchange; Technologies

Natural organic matter (NOM) and nitrate are among the constituents of surface water causing concern and affecting treatment processes. NOM is known as a primary precursor for chlorinated disinfection by-products. Also, it causes membrane fouling, reduces the aesthetic quality of water, and leads to deterioration of biological stability of water. Under the application of ultraviolet (UV)-based advanced oxidation processes (AOPs) to surface water for the removal of micropollutants, NOM scavenges hydroxyl radicals and screens UV, thereby reduces the overall efficacy of the treatment applied. Nitrate in raw water is an anion of health concern if it exceeds the regulations. Moreover, nitrate can be converted to nitrite (a more serious health concern) during the application of certain UV-based AOPs. Therefore, improving the water quality upstream of the UV-based AOPs is of interest and could lead to improved performance and reduced energy consumption.******Ion Exchange (IEX) treatment process could be utilized as the primary barrier in a treatment train to remove NOM and nitrate simultaneously. The application of IEX has the potential to improve water quality undergoing further treatment with AOPs used for the removal of trace concentration of micropollutants. That said, studies have shown the presence of inorganic anions to interfere with NOM removal, thus reducing the overall efficacy of the IEX process.******The main objective of the proposed research program is to develop and address fundamental challenges of applying IEX as well as UV-based AOPs to water treatment. Special emphasis will be given to developing and evaluating fluidized bed IEX reactors along with their combinations with UV-based AOPs. In addition, this proposal intends to address some fundamental and engineering issues related to the impact of IEX and UV-based AOPs on water quality. These overall goals will be achieved by focusing on three specific and highly important sub-objectives:***1. Develop and study fluidized bed IEX process and evaluate various design criteria***2. Investigate the impact of IEX process on the efficacy of UV-based AOPs at removing model micropollutants by improving the upstream water quality***3. Study the profile of water quality throughout the combined IEX and UV-AOPs ***4. Study the fate of nitrogenated byproducts during the combined IEX and UV-AOP treatments.******Each of the above sub-objectives will be achieved through extensive laboratory experiments along with modeling and theoretical analysis. All these will lead to the development of efficient technologies will contribute significantly to improving health, quality of life, and the environment in Canada. It will have beneficial impacts among the engineering and scientific communities, since it represents a fundamental approach to the development and application of such integrated technology.**

天然有机物（NOM）和硝酸盐是地表水的成分之一，引起关注并影响处理过程。NOM被认为是氯化消毒副产物的主要前体。 此外，它还会导致膜污染，降低水的美观质量，并导致水的生物稳定性恶化。在将基于紫外线（UV）的高级氧化工艺（AOPs）应用于地表水以去除微污染物时，NOM清除羟基自由基并屏蔽UV，从而降低所应用的处理的总体功效。原水中的硝酸盐如果超过规定，则是一种健康问题的负离子。此外，硝酸盐可以转化为亚硝酸盐（一个更严重的健康问题）在某些紫外线为基础的高级氧化剂的应用。因此，改善紫外线高级氧化工艺上游的水质是有意义的，可以提高性能并降低能耗。*离子交换（IEX）处理工艺可以作为处理系统中的主要屏障，同时去除NOM和硝酸盐。IEX的应用有可能改善水质，进一步处理与用于去除微量浓度的微污染物的高级氧化物。 也就是说，研究表明无机阴离子的存在会干扰NOM的去除，从而降低IEX工艺的整体效率。拟议研究计划的主要目标是开发和解决将IEX以及基于UV的AOP应用于水处理的基本挑战。 将特别强调发展和评估流化床IEX反应器沿着以及它们与基于UV的AOP的组合。 此外，该提案旨在解决与IEX和紫外线AOPs对水质影响相关的一些基本和工程问题。为实现这些总体目标，将侧重于三个具体和非常重要的次级目标：*1.开发和研究流化床IEX工艺，评估各种设计标准 *2.研究IEX工艺对紫外线高级氧化工艺通过改善上游水质去除模型微污染物的效果的影响 *3.研究IEX和UV-AOP组合过程中的水质概况 *4.研究IEX和UV-AOP联合处理过程中氮化副产物的去向。******上述每个子目标都将通过广泛的实验室实验沿着建模和理论分析来实现。所有这些都将导致高效技术的发展，这将大大有助于改善加拿大的健康、生活质量和环境。它将在工程和科学界产生有益的影响，因为它代表了开发和应用这种综合技术的基本方法。