Nitrogen Oxide Flux from Sludge-Amended Soil

9803746皮尔斯-本项目的目的是确定一氧化氮通量的污泥改良土壤的条件下，模拟现场应用，这将有助于建立积极使用的土壤管理来自生活污水处理的污泥的工程设计限制的意义。 从各种来源包括化肥施入土壤的含氮物质会受到物理、化学和生物过程的影响，这些过程间接或直接影响它们的运输并改变它们的物理状态。 将剩余污泥施用到农业土壤中可能会显著影响氮氧化物的微生物生产，其生产可能会对当地和区域空气质量产生不利影响。 在实验室中进行研究的土壤将取自农业用地，与目前用于土地施用污泥的土壤相当。 污泥将从北卡罗来纳州的查佩尔山污水处理厂获得。 最近强调积极使用土地污泥管理建议确定是否知识目前可用的氮氧化物排放特性，从这些土壤和它们的作用，形成大气臭氧的贡献是足够的，以建立工程设计参数，这种管理理念。 在NSF资助号9727886下启动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州立大学共同研究者Viney P. Aneja博士（海洋、地球和大气科学系）和韦恩P. Robarge博士（土壤科学系）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，以确定所需的额外研究范围，以将现有的自然和化学施肥土壤中活性氮氧化物通量的知识与用于污泥管理的土壤联系起来。 ***

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. ***