UNS: The Oxidative Potential of Manganese Oxides in Passive Water Treatment Systems

UNS：被动水处理系统中锰氧化物的氧化电位

• 批准号: 1509879
• 负责人: Matthew Ginder-Vogel
• 金额: $ 32.81万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1509879&HistoricalAwards=false
• 关键词: UNS; Oxidative; Potential; Manganese; Oxides

1509879Ginder-VogelNaturally occurring and synthetic manganese oxides are among the strongest, naturally occurring oxidants and can destroy hazardous organic compounds. Organic compounds are widespread among aqueous pollutants and include many endocrine disrupting compounds, biologically active hormones, and antibiotics. These chemicals are generally not removed nor significantly degraded by traditional primary and secondary wastewater treatment technologies, resulting in their discharge to and presence in drinking water sources, including surface and groundwater. Thus the focus of this project is to explore the use of manganese oxides as inexpensive passive oxidants to remove a variety of organic contaminants from water.The objectives of the proposed research are to: (1) assess the reactivity of target organic compounds with manganese oxides, and, (2) investigate the impact of environmental conditions on manganese oxide reactivity. The PIs will (1) assess the reactivity and transformation mechanisms of target organic compounds (e.g., model phenols and phenolic contaminants) with delta-MnO2 (a pure Mn(IV) oxide) and previously uncharacterized manganese solids collected from a drinking water treatment system, while quantifying changes in solid-phase manganese oxide chemistry, (2) quantify the role of dissolved O2 in limiting manganese oxide surface passivation during contaminant oxidation, and, (3) quantify the impact of competing reactions on target contaminant transformation. The proposed work will yield important insights into the fundamental and practical considerations that govern the ability of manganese oxides to degrade organic contaminants in environmental settings. Due to their high reactivity, manganese oxides could be applied to remove recalcitrant organic contaminants in a variety of water treatment applications. For example, manganese oxide-based filter media could be used in green infrastructure, such as bioretention ponds, permeable pavements, green roofs and vegetated swales, to oxidize a wide range of contaminants in urban stormwater. Similarly, a layer of manganese oxides could be installed below the geosynthetic or clay-based liners typically used to contain landfill or manure lagoon leachate. This project will provide research, teaching and mentoring opportunities for a graduate student and a research opportunity for an undergraduate summer intern each summer.

1509879 Ginder-Vogel天然和合成锰氧化物是天然存在的最强氧化剂之一，可以破坏有害的有机化合物。有机化合物广泛存在于水污染物中，包括许多内分泌干扰化合物、生物活性激素和抗生素。这些化学品通常无法通过传统的一级和二级废水处理技术去除或显著降解，导致其排放到饮用水源，包括地表水和地下水中。因此，本研究的重点是探讨使用锰氧化物作为廉价的被动氧化剂来去除水中的各种有机污染物，研究的目标是：（1）评估目标有机化合物与锰氧化物的反应性，（2）研究环境条件对锰氧化物反应性的影响。PI将（1）评估目标有机化合物的反应性和转化机制（例如，模型酚和酚类污染物）与δ-MnO 2（纯Mn（IV）氧化物）和先前未表征的从饮用水处理系统收集的锰固体，同时量化固相氧化锰化学性质的变化，（2）量化溶解的O2在污染物氧化期间限制氧化锰表面钝化的作用，以及，（3）量化竞争反应对目标污染物转化的影响。拟议的工作将产生重要的见解的基本和实际的考虑因素，管理锰氧化物的能力，降解环境中的有机污染物。由于锰氧化物的高反应活性，其可用于去除各种水处理应用中的难降解有机污染物。例如，基于氧化锰的过滤介质可用于绿色基础设施，如生物滞留池、可渗透路面、绿色屋顶和植被洼地，以氧化城市雨水中的各种污染物。同样，可在通常用于容纳垃圾填埋场或粪肥泻湖渗滤液的土工合成材料或粘土衬里下面安装一层氧化锰。该项目将为研究生提供研究，教学和指导机会，并为本科生暑期实习生提供研究机会。