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，过量的氮排放到地表水体（例如，湖泊、河流和河口）正在造成普遍和令人烦恼的环境问题，从有害藻华（HAB）到全面的富营养化，对全国的水质产生负面影响。目前对氮（N）水污染的研究主要集中在无机氮（例如硝酸盐）上。溶解有机氮（DON），虽然往往是污水厂流出物中氮的一大部分，但在历史上一直被忽视。该项目的主要研究者和其他人最近的研究表明，垃圾填埋场渗滤液是DON的重要来源，其N质量流量与废水流出物和农业径流相当。本研究的目的是表征DON从垃圾填埋场渗滤液，评估其富营养化的潜力，其去除效率在污水处理厂使用生物脱氮工艺。该项目的成功完成将通过开发新的基础知识来造福社会，这些知识可用于为废水处理过程中的脱氮提供信息，以及对减轻有害生物感兴趣的水质管理人员。通过利益相关者/公众宣传和学生教育/培训，包括指导一名博士生和一名就读于HBCU（北卡罗来纳州AT州立大学）的未毕业生，将进一步造福社会。目前关于地表水体氮（N）污染的研究主要集中在无机氮，即，农业径流和工厂废水中的硝酸盐。然而，越来越多的证据表明，溶解有机氮（DON）从垃圾填埋场渗滤液是一个重要的氮污染源。来自垃圾渗滤液的DON已被证明由两大类化合物1）蛋白质DON和2）腐殖物质（HS）衍生的DON组成。这两种组分具有不同的分子组成，在使用生物营养物去除（BNR）工艺的污水处理厂中的藻类生长刺激和脱氮过程中具有明显不同的行为。本研究的总体目标是全面调查垃圾渗滤液中DON的发生、特征、在不同BNR过程情景/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的发生和组成与垃圾填埋场特征（例如，（2）阐明了垃圾渗滤液中DON在常规和短程BNR工艺中的降解、转化和去除规律;（3）评价了垃圾渗滤液中DON对有害藻华动态的影响。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渗滤液收集结合起来，然后进行藻类生长和刺激的生物测定来实现。成功完成拟议的研究可以提供新的数据和基础知识，以指导DON减轻水污染和HABs。该奖项由NSF/ENG/CBET部门的环境工程和环境可持续性计划以及NSF/ENG/CBET部门的扩大参与工程计划共同资助。该奖项反映了NSF的法定使命，并通过使用基金会的知识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

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
• 作者: Md Ashik Ahmed*, Md Redowan

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
• 作者: Md Redowan Rashid, Md Ashik