Nitrogen Oxide Flux from Sludge-Amended Soil

9803746 Peirce该项目的目的是确定在模拟现场应用条件下污泥修正土壤中一氧化氮通量的重要性，这将有助于确定在管理生活废水处理产生的污泥时积极使用土壤的工程设计限制。从包括化肥在内的所有来源施用于土壤的含氮物质都受到物理、化学和生物过程的影响，这些过程间接或直接影响其运输并改变其物理状态。残泥在农业土壤中的应用可能会显著影响氮氧化物的微生物生产，而氮氧化物的生产可能会对当地和区域的空气质量产生不利影响。将在实验室进行研究的土壤将从农业用地中获得，与目前用于污泥土地应用的土壤相当。污泥将从北卡罗莱纳教堂山污水处理厂获得。最近对积极利用土地进行污泥管理的强调表明，确定目前关于这些土壤的氮氧化物排放特征及其对大气臭氧形成的作用的知识是否足以为这一管理概念建立工程设计参数。在美国国家科学基金会（NSF）第9727886号资助下的探索性研究的更新中，杜克大学的实验室研究将用于指导与北卡罗来纳州立大学海洋、地球和大气科学系的共同调查员Viney P. Aneja博士和土壤科学系的Wayne P. Robarge博士合作进行的实地研究。实验室实验的结果将与实地研究的结果进行比较，以确定需要进行更多研究的范围，以便将有关活性氮氧化物从天然和化学施肥土壤到用于污泥管理的土壤的通量的现有知识联系起来。＊＊＊

9803746 Peirce The objective of this project is to determine the significance of nitric oxide flux from sludge-amended soils under conditions that simulate field application that will assist in establishing engineering design limitations of aggressive use of soil for management of sludges derived from treatment of domestic wastewater. Nitrogenous substances applied to soil from all sources including chemical fertilizers are subject to physical, chemical and biological processes that indirectly or directly affect their transport and alter their physical state. The application of residual sludges to agricultural soil may significantly impact the microbial production of nitrogen oxides, the production of which may adversely impact local and regional air quality. Soils to be investigated in the laboratory will be obtained from agricultural land comparable to that currently being used for land application of sludge. Sludge will be obtained from the Chapel Hill, North Carolina wastewater treatment plant. Recently emphasis on aggressive use of land for sludge management suggests determining whether knowledge currently available regarding the nitrogen oxide emission characteristics from these soils and their role in contribution to formation of atomospheric ozone is sufficient to establish engineering design parameters for this management concept. In this renewal of exploratory research initiated under NSF Grant No. 9727886, laboratory studies at Duke University will be used to guide field studies conducted in cooperation with North Carolina State University co-investigators Dr. Viney P. Aneja, Department of Marine, Earth and Atmospheric Sciences and Dr. Wayne P. Robarge, Department of Soil Science. Results of laboratory experiments will be compared with those from field studies to determine the scope of additional research needed to relate existing knowledge of the flux of reactive nitrogen oxide from natural and chemically fertilized soils to soils that are used for sludge management. ***