Pilot-scale Research of Novel Amendment Delivery for in-situ Sediment Remediation

沉积物原位修复新型修复剂输送中试研究

• 批准号: 7919678
• 负责人: Upal Ghosh
• 金额: $ 20.5万
• 依托单位: UNIVERSITY OF MARYLAND BALTIMORE COUNTY
• 依托单位国家: 美国
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-06 至 2011-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7919678
• 关键词: Address; Adoption; Amendment; Apatites; Area; Assimilations; Bauxite; Benefits and Risks; Binding; Biological; Biological Availability; Biological Monitoring; Biological Process; Biota; Carbon; Chemicals; Collaborations; Consultations; Dermal; Dose; Eating; Ecosystem; Effectiveness; Engineering; Environment; Exposure to; Fishes; Food Chain; Fresh Water; Habitats; Health; Health Benefit; Human; In Situ; Injection of therapeutic agent; Investigation; Laboratories; Life; Measurement; Measures; Mechanics; Methods; Minerals; Modeling; Monitor; Names; Pathway interactions; Philadelphia; Polychlorinated Biphenyls; Process; Public Health; Recreation; Research; Research Design; Research Personnel; Research Project Grants; Risk; Rivers; Shellfish; Site; System; Technology; Testing; Time; Transport Process; United States Environmental Protection Agency; Water; Work; Zeolites; aqueous; base; chemical release; contaminant transport; cost; design; exposed human population; food chain contamination; meetings; novel; novel strategies; pollutant; pressure; programs; remediation; scale up; toxic metal; uptake

Human health risks associated with the presence of chemicals in sediments arise from either direct contact with the sediments or by eating fish and shellfish that have accumulated chemicals from the sediments. merging laboratory-scale research by our group and others has shown that contaminant transport pathways and bioavailability can be interrupted by modifying and enhancing the binding and contaminant assimilation capacity of natural sediments. This is achieved by adding sorbent amendments such as activated carbon for binding persistent organic pollutants and natural minerals such as apatite, zeolites, or bauxite for the binding of toxic metals in sediments. Critical barriers in the adoption of this in-situ remediation approach is the availability of efficient delivery methods for amendments to impacted sediments and understanding of physical and biological processes in field sites that control technology effectiveness. The main aim of this research project is to develop the in-situ remediation technology through a pilot-scale investigation aimed at addressing the critical barriers in the advancement of the technology. This field research project will be carried out at two PCB/DDT-impacted sensitive wetland sites. The research design will involve application of the technology in a quarter acre plot in each site and a monitoring plan to understand how the fate and transport processes of PCB/DDT in the wetland environment is impacted by the application of the sorbent amendments. Biological monitoring will include PCB/DDT bio-uptake measurements in a freshwater oligochaete carried out in field exposure chambers and also in laboratory microcosms. The physicochemical monitoring will include aqueous partitioning and desorption rate from sediment, two measures that define the bioavailability processes of sediment bound contaminants. The PCB/DDT fate and transport process understanding will be used to assess human health risk benefit from the technology based on a dermal uptake model and a food-chain model. Sediment-bound contaminants such as PCBs and DDT pose a public health risk through contamination of the food chain and through direct exposure. This field research will evaluate the effectiveness of a novel approach to alter the binding capacity of sediments to reduce human exposure to such contaminants.

与沉积物中存在的化学物质有关的人类健康风险来自直接接触