Simulation of Singlet Oxygen Kinetics for Trace Organic Transformation in Wastewater Effluent
废水中痕量有机物转化的单线态氧动力学模拟
基本信息
- 批准号:1803919
- 负责人:
- 金额:$ 33万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-08-01 至 2022-01-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Water resources in dry regions are stressed by drought and population growth. Wastewater reclamation can provide an additional source of water for these areas. However, trace contaminants such as pharmaceuticals that are not removed during wastewater treatment may pose ecological and/or human health concerns. This project will provide new information on the role of sunlight in destroying potentially toxic trace contaminants, addressing the national need for sustainable, low cost and energy efficient technologies for water treatment. Results will inform design of wastewater reclamation treatment systems in water-stressed areas. The project will take advantage of programs at the University of Arizona to augment educational activities among disadvantaged students in STEM areas. If successful, this project will provide valuable information on how to remove potentially harmful pharmaceutical and other contaminants from wastewater to allow its safe re-use in areas where water security is threatened. Solar-driven processes involving effluent organic matter (EfOM) generate reactive oxygen species (ROS) that contribute to transformations of trace organic contaminants (TOrCs). For an important subset of TOrCs, a reaction with singlet oxygen is the dominant natural reaction pathway in treated wastewater. It is not yet possible to provide a physically accurate representation of that pathway or the kinetics of indirect photolytic transformations of TOrCs by singlet oxygen. Areas of uncertainty include (i) the dependence of quantum efficiency for singlet oxygen generation on light wavelength, (ii) the identities and concentrations of sensitizers in EfOM that participate in generating singlet oxygen, (iii) reaction rate constants for many TOrCs with singlet oxygen, and (iv) the toxicities of ROS-generated transformation products. The primary objective of proposed work is to support the development of a robust and physically accurate kinetic model for the light-driven degradation of TORCs via reaction with singlet oxygen in treated wastewater. The proposed research will use mathematically-supported methods to eliminate or minimize uncertainties in the photochemistry of singlet-oxygen-dependent mechanisms for TOrC transformations in treated wastewater. More specifically, the work is designed to expose (i) the concentrations and characters of EfOM fractions that serve as sensitizers in the singlet oxygen pathway, and (ii) the dependence of quantum efficiency for singlet oxygen on light wavelength. Results will support development of improved kinetic models that are potentially useful for reactor design in advanced wastewater treatment systems. Next generation models based on bulk organic characteristics in EfOM and quantum efficiencies normalized to dissolved organic concentration are necessary to overcome deficiencies in state-of-the-art kinetic representations that are necessarily conditional in character.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
干旱地区的水资源受到干旱和人口增长的压力。废水回收可以为这些地区提供额外的水源。然而,在废水处理过程中没有去除的微量污染物,如药物,可能会造成生态和/或人类健康问题。该项目将提供关于阳光在销毁潜在有毒痕量污染物方面的作用的新信息,满足国家对可持续、低成本和高能效的水处理技术的需求。研究结果将为缺水地区污水再生处理系统的设计提供参考。该项目将利用亚利桑那大学的项目,在STEM地区的弱势学生中加强教育活动。如果成功,该项目将提供有价值的信息,说明如何从废水中去除潜在有害的药物和其他污染物,以便在水安全受到威胁的地区安全地重新使用。涉及废水有机物(EfOM)的太阳能驱动过程产生的活性氧物种(ROS)有助于痕量有机污染物(TORCs)的转化。对于TORCS的一个重要子集,与单线态氧的反应是处理后废水中主要的自然反应途径。目前还不可能提供单线态氧间接光解TORCS转化途径或动力学的物理上的准确表示。不确定的领域包括(I)产生单线态氧的量子效率与光波长的关系,(Ii)EfOM中参与产生单线态氧的敏化剂的身份和浓度,(Iii)许多扭矩与单线态氧的反应速率常数,以及(Iv)ROS产生的转化产物的毒性。拟议工作的主要目标是支持开发一个健壮的和物理上准确的动力学模型,用于通过与处理后废水中的单线态氧反应来光驱动降解Torces。拟议的研究将使用数学支持的方法来消除或最大限度地减少处理后废水中TORC转化的单线态氧依赖机制的光化学中的不确定性。更具体地说,这项工作旨在揭示(I)在单线态氧途径中作为敏化剂的EfOM组分的浓度和特性,以及(Ii)单线态氧的量子效率与光波长的关系。结果将支持改进的动力学模型的开发,这些模型可能对高级废水处理系统中的反应器设计有用。基于EfOM中的整体有机特性和归一化到溶解有机浓度的量子效率的下一代模型是必要的,以克服在特性上必须有条件的最先进的动力学表示中的不足。该奖项反映了NSF的法定使命,并通过使用基金会的智力优势和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(0)
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David Quanrud其他文献
Trace organic compounds and photosensitizing activity in Salvadoran surface and tap water sources: A first look
萨尔瓦多地表水和自来水中微量有机化合物和光敏活性的研究:初步观察
- DOI:
10.1016/j.envpol.2024.125622 - 发表时间:
2025-02-15 - 期刊:
- 影响因子:7.300
- 作者:
Violeta Martínez;Doorae Lee;Ibrahim Alyami;Hercilio Zimila;Fernando Bautista;Andrea Fuentes;María José López;Gerson Valencia;David Quanrud;Robert G. Arnold;A. Eduardo Sáez - 通讯作者:
A. Eduardo Sáez
David Quanrud的其他文献
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