BRIGE: Reactivity of Effluent Organic Matter (EfOM) towards Hydroxyl Radical and Its Effect on the Application of Advanced Oxidation for Water Reuse Applications

Pi：Rosario-Ortiz，FernandoProposal编号：0926396项目总结。全球对水可获得性的担忧突显了开发有效的水再利用计划以缓解当前和未来需求的重要性。水再利用是指将废水作为饮用水和非饮用水应用的额外来源。然而，与传统的废水处理相比，重复使用水需要额外的处理，以减少与有机污染物和病原体相关的风险。就废水有机污染物而言，目前使用了几种工艺将其降低到可接受的水平，特别是利用高级氧化工艺(AOPS)。AOPS是基于高活性物种的活性，通常是羟基自由基(OH)，它们直接在水中产生，然后发生反应，破坏令人担忧的有机污染物。虽然AOPS在非选择性地破坏污染物方面具有显著的优势，但其应用中最重要的因素之一是由于与其他水质成分的副反应(清除)而减少了有效OH，最重要的是出水有机物(EfOM)。EfOM是人类废水特有的有机碳，而天然有机物(NOM)来自植物和土壤来源。详细了解EfOM的反应性，包括该材料中的特定亚组分，将导致有针对性地对EfOM进行预处理，以在高清除组分冷影响AOP处理系统的效率之前将其去除。在这项研究中，通过定量测定不同EfOM亚组分的反应性，并评估可用于降低总体EfOM反应性的潜在处理方案，对EfOM和OH之间的化学反应进行了详细的评估。智力上的优点。在最佳条件下，应用AOPS降低水回用操作中的有机污染物水平是可行的。详细了解EfOM的反应性是很重要的，因为这种物种将主导OH清除反应。然而，由于无法确定其特定的化学结构，阻碍了对EfOM化学的详细、定量的研究。这个项目将对EfOM对？OH的反应性进行详细的表征；特别是通过定量测量反应速率常数和与EfOM整体性质的关联，具体地关联不同的亚成分(组分)与其反应性的关系。对特定EfOM反应性的了解将指导对可能降低其整体反应性的现有处理工艺的评估，从而使AOPS在水再利用中的应用更加有效，从而具有可行性。更广泛的影响。更好地了解EfOM对AOP应用的影响将导致AOPS在国内和国际上的水再利用应用的优化。此外，参与这个项目将使学生接触到水再利用这一复杂的主题，这对世界许多地区的持续增长和环境健康非常重要。拟议的项目还旨在促进本科生和研究生在这一重要领域的参与和互动，特别是参与机构的工程和科学专业代表不足的学生。学生将参与项目的所有方面，进行表征和动力学实验，分析数据，并将这项工作的结果联系起来。参与的学生将利用最先进的设施进行所需的测量，并最终在国内和国际会议和研讨会上展示他们的发现。此外，预计这项研究的所有结果将为CU Boulder的环境工程课程和CSULB的化学/环境科学课程提供材料。

PI: Rosario-Ortiz, FernandoProposal Number: 0926396Project summary. Global concern over water availability has highlighted the importance of developing effective water reuse programs to alleviate current and future needs. Water reuse refers to the utilization of wastewater as an additional source for both potable and non-potable water applications. However, reusing water requires additional treatment, as compared to traditional wastewater handling, in order to reduce risks associated with organic contaminants and pathogens. In the case of wastewater organic contaminants, several processes are currently used to reduce them to acceptable levels, notably the utilization of advanced oxidation processes (AOPs). AOPs are based on the activity of highly reactive species, typically hydroxyl radicals (OH), which are generated directly in the water and then react to destroy organic contaminants of concern. While AOPs have significant advantages in their ability to non-selectively destroy contaminants, one of the most important factors in their application is the decrease in the available OH due to side reactions (scavenging) with other water quality components, most importantly effluent organic matter (EfOM). EfOM is the organic carbon unique to human derived wastewater, in contrast to natural organic matter (NOM), which is derived from plant and soil based sources. A detailed understanding of the reactivity of EfOM, including specific sub-components within this material, would result in targeted pre-treatment of EfOM to remove high scavenging components before they cold impact the efficiency of AOP treatment systems. In this study a detailed evaluation of the chemistry between EfOM and OH is proposed by quantitatively determining the reactivity of different EfOM sub-components and to evaluate potential treatment options that could be applied to reduce overall EfOM reactivity. Intellectual merit. The application of AOPs to reduce levels of organic contaminants in water reuse operations is feasible under optimal conditions. A detailed understanding of the reactivity of EfOM is important, as this species will dominate OH scavenging reactions. However, a detailed, quantitative, study of EfOM chemistry is hindered by the inability to define its specific chemical structure. This project will conduct a detailed characterization of the reactivity of EfOM towards ?OH; specifically correlating how different sub-components (fractions) relate to its reactivity through quantitative measurement of reaction rate constants and correlation to EfOM bulk properties. Knowledge of specific EfOM reactivity will guide evaluation of existing treatment processes that could decrease its overall reactivity, therefore making the application of AOPs for water reuse more efficient and thus feasible. Broader impacts. A better understanding of the effect of EfOM on AOP applications will lead to the optimization of AOPs for water reuse applications both nationally and internationally. Furthermore, participation in this project will allow students to be exposed to the complex topic of water reuse, which is important to sustained growth and environmental health in many areas throughout the world. The proposed project is also designed to promote undergraduate and graduate student involvement and interaction in this vital area, particularly under-represented students in engineering and science at participating institutions. Students will be involved in all aspects of the project, performing the characterization and kinetics experiments, analyzing data, and correlating the findings of this work. The involved students will utilize state-of-the-art facilities to perform the required measurements, and ultimately present their findings at national and international meetings and workshops. Moreover, it is expected that all the results of this study will provide material to be incorporated in environmental engineering courses at CU Boulder and chemistry/ environmental science courses at CSULB.