Excellence in Research: Delineating the characteristics, transformation and water quality impacts of landfill leachate induced dissolved organic nitrogen

卓越研究：描述垃圾渗滤液引起的溶解有机氮的特征、转化和水质影响

• 批准号: 2101053
• 负责人: Renzun Zhao
• 金额: $ 41.76万
• 依托单位: North Carolina Agricultural & Technical State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-01 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2101053&HistoricalAwards=false
• 关键词: Excellence; Research; Delineating; characteristics; transformation

In the United States, the discharge of excess nitrogen into surface water bodies (e.g., lakes, rivers, and estuaries) is causing pervasive and vexing environmental problems ranging from harmful algal blooms (HABs) to complete eutrophication that negatively impact water quality nationwide. Current research on nitrogen (N) water pollution has primarily focused on inorganic nitrogen (e.g. nitrate). Dissolved organic nitrogen (DON), while often a large fraction of the nitrogen from wastewater plant effluents, has been historically overlooked. Recent studies by the Principal Investigators of this project and others suggest that landfill leachates are significant sources of DON with comparable N mass flows as wastewater effluents and agricultural runoffs. The goals of this research are to characterize DON from landfill leachates, evaluate its eutrophication potential, and its removal efficiency in wastewater treatment plants using biological nutrient removal processes. The successful completion of this project will benefit society through the development of new fundamental knowledge that could be used to inform nitrogen removal during wastewater treatment as well as water quality managers interested in mitigating HABs. Further benefits to society will be achieved through stakeholder/public outreach and student education/training including the mentoring of one doctoral student and an ungraduate student enrolled at an HBCU (North Carolina A&T State University).Current research on nitrogen (N) pollution in surface water bodies has focused primarily on inorganic nitrogen, i.e., nitrate from agricultural runoff and wasterwater plant effluents. However, there is growing evidence that dissolved organic nitrogen (DON) from landfill leachates is a significant source of N pollution. DON from landfill leachates has been shown to consist of two broad classes of compounds 1) proteinaceous DON and 2) humic substances (HS) derived DON. These two fractions have different molecular compositions with distinctly different behaviors during algal growth stimulation and N removal in wastewater treatment plants using biological nutrient removal (BNR) processes. The overarching goal of this research is to comprehensively investigate the occurrence, characteristics of DON from landfill leachates, its degradation and transformation patterns in various BNR process scenarios/configurations, and its impacts on harmful algal blooms. To advance this goal, the Principal Investigators of this project propose to carry out an integrated experimental program structured around three specific objectives: 1) Correlate occurrence and composition of DON with landfill characteristics (e.g., age and stabilization stage), 2) Elucidate the degradation, transformation, and removal of landfill leachate induced DON in conventional and short-cut BNR processes, and (3) Evaluate the impacts of landfill leachate induced DON on harmful algal bloom dynamics. These specific objectives will be accomplished by coupling state-of-the-art DON characterization studies with laboratory scale BRN experiments and field DON leachate collections followed by bioassays of algal growth and stimulation. The successful completion of the proposed research could provide new data and fundamental knowledge to guide the mitigation of water pollution and HABs by DON.This award is jointly funded by the Environmental Engineering and Evironmental Sustainability programs of the NSF/ENG/CBET Division and the Broadening Participation in Engineering program of the NSF/ENG/EEC Division.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.

在美国，向地表水体（例如湖泊、河流和河口）排放过量的氮正在造成普遍且令人烦恼的环境问题，从有害藻华（HAB）到完全富营养化，对全国水质产生负面影响。目前关于氮（N）水污染的研究主要集中在无机氮（例如硝酸盐）。溶解有机氮 (DON) 虽然通常占废水处理厂废水中氮的很大一部分，但历来都被忽视。该项目的主要研究人员和其他人最近的研究表明，垃圾填埋场渗滤液是呕吐毒素的重要来源，其氮质量流量与废水排放物和农业径流相当。本研究的目标是表征垃圾填埋场渗滤液中的 DON，评估其富营养化潜力及其在采用生物营养物去除工艺的废水处理厂中的去除效率。该项目的成功完成将通过开发新的基础知识造福社会，这些知识可用于为废水处理过程中的脱氮以及对减少有害藻华感兴趣的水质管理者提供信息。通过利益相关者/公众宣传和学生教育/培训，包括对 HBCU（北卡罗来纳州 A&T 州立大学）就读的一名博士生和一名本科生的指导，将实现对社会的进一步惠益。地表氮 (N) 污染的当前研究水体主要关注无机氮，即来自农业径流和废水处理厂废水的硝酸盐。然而，越来越多的证据表明，垃圾填埋场渗滤液中的溶解有机氮（DON）是氮污染的重要来源。垃圾填埋场渗滤液中的 DON 已被证明由两大类化合物组成：1) 蛋白质 DON 和 2) 腐殖质 (HS) 衍生的 DON。这两种组分具有不同的分子组成，在废水处理厂使用生物营养物去除 (BNR) 工艺刺激藻类生长和去除氮期间具有明显不同的行为。本研究的总体目标是全面研究垃圾渗滤液中 DON 的发生、特征、其在各种 BNR 工艺场景/配置中的降解和转化模式，及其对有害藻华的影响。为了推进这一目标，该项目的主要研究人员建议围绕三个具体目标开展一项综合实验计划：1）将 DON 的出现和组成与垃圾填埋场特征（例如年龄和稳定阶段）相关联，2）阐明降解情况传统和快捷 BNR 工艺中垃圾渗滤液引起的 DON 的转化和去除，以及 (3) 评估垃圾渗滤液引起的 DON 对有害藻类水华动态的影响。这些具体目标将通过将最先进的 DON 表征研究与实验室规模的 BRN 实验和现场 DON 渗滤液收集相结合，然后对藻类生长和刺激进行生物测定来实现。拟议研究的成功完成可以为指导 DON 减轻水污染和 HAB 提供新的数据和基础知识。该奖项由 NSF/ENG/CBET 部门的环境工程和环境可持续发展项目和 Broadening参与 NSF/ENG/EEC 部门的工程计划。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值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

Evaluation of Physicochemical Treatment Technologies for Landfill Leachate Induced Dissolved Organic Nitrogen (DON).

垃圾渗滤液引起溶解有机氮（DON）的物化处理技术评价。

• 发表时间: 2023-06
• 期刊: 2023
• 作者: Md Redowan Rashid; Md Ashik
• 通讯作者: Md Ashik

Fate and Transport of the Biologically Treated Landfill Leachate Induced Dissolved Organic Nitrogen (DON)

生物处理垃圾渗滤液引起的溶解有机氮 (DON) 的归宿和迁移

• 发表时间: 2023-06
• 期刊: 2023
• 作者: Md Ashik Ahmed*; Md Redowan
• 通讯作者: Md Redowan

Microplastics in landfill leachate: Sources, detection, occurrence, and removal

垃圾渗滤液中的微塑料：来源、检测、出现和清除

• DOI: 10.1016/j.ese.2023.100256
• 发表时间: 2023-10
• 期刊: Environmental Science and Ecotechnology
• 影响因子: 12.6
• 作者: Kabir, Mosarrat Samiha;Wang, Hong;Luster-Teasley, Stephanie;Zhang, Lifeng;Zhao, Renzun
• 通讯作者: Zhao, Renzun