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: 7340895
• 负责人: Upal Ghosh
• 金额: $ 29.6万
• 依托单位: UNIVERSITY OF MARYLAND BALTIMORE COUNTY
• 依托单位国家: 美国
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-25 至 2010-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7340895
• 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; Depth; 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; Numbers; Pathway interactions; Philadelphia; Polychlorinated Biphenyls; Process; Public Health; Rate; 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; desire; exposed human population; food chain contamination; novel; novel strategies; pollutant; pressure; programs; remediation; scale up; toxic metal; uptake

DESCRIPTION (provided by applicant): 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. Emerging 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.

描述（由申请人提供）： 与沉积物中化学物质存在有关的人类健康风险是由与沉积物的直接接触或食用从沉积物中积累化学物质的鱼类和贝类引起的。我们小组和其他人的新兴实验室规模研究表明，可以通过修改和增强天然沉积物的结合和污染物同化能力来中断污染物的运输途径和生物利用度。这是通过添加吸附剂修正案（例如活性炭）来实现的，用于结合持续的有机污染物和天然矿物质，例如磷灰石，沸石或铝土矿，以结合沉积物中有毒金属的结合。采用这种原位补救方法的关键障碍是有效的交付方法可用于修正受影响的沉积物的修订以及对控制技术有效性的现场现场中物理和生物过程的理解。该研究项目的主要目的是通过试点调查来开发现场补救技术，旨在解决该技术进步的关键障碍。该现场研究项目将在两个PCB/DDT影响敏感的湿地站点进行。研究设计将涉及该技术在每个站点的四分之一英亩地图中的应用，以及一个监测计划，以了解PCB/DDT在湿地环境中的命运和运输过程如何受到吸附剂修正案的应用影响。生物监测将包括在现场暴露室和实验室缩影中进行的淡水寡头啤酒中的PCB/DDT生物摄取测量。物理化学监测将包括沉积物的水分分配和解吸速率，这是定义沉积物结合污染物的生物利用度过程的两种措施。 PCB/DDT命运和运输过程的理解将用于根据皮肤摄取模型和食品链模型从技术中评估人类健康风险受益。诸如PCB和DDT之类的污染物结合的污染物通过食物链的污染和直接暴露构成公共卫生风险。这项现场研究将评估一种新方法，以改变沉积物的结合能力，以减少人类对这种污染物的暴露。