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: 7500234
• 负责人: Upal Ghosh
• 金额: $ 29.01万
• 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/7500234
• 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）： 与沉积物中存在的化学物质相关的人类健康风险是由于直接接触沉积物或食用从沉积物中积累了化学物质的鱼类和贝类而产生的。我们小组和其他人进行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传输途径和生物利用度。这是通过添加吸附剂改良剂来实现的，例如用于结合持久性有机污染物的活性炭和用于结合沉积物中有毒金属的天然矿物（例如磷灰石、沸石或铝土矿）。采用这种原位修复方法的关键障碍是是否有有效的交付方法来修正受影响的沉积物，以及了解现场控制技术有效性的物理和生物过程。该研究项目的主要目的是通过试点研究开发原位修复技术，旨在解决该技术进步的关键障碍。该实地研究项目将在两个受 PCB/DDT 影响的敏感湿地地点进行。研究设计将涉及在每个地点四分之一英亩的土地上应用该技术，并制定监测计划，以了解湿地环境中 PCB/DDT 的归宿和迁移过程如何受到吸附剂改良剂应用的影响。生物监测将包括在野外暴露室和实验室微观世界中进行的淡水寡毛类 PCB/DDT 生物吸收测量。物理化学监测将包括沉积物的水分配和解吸率，这两项指标定义了沉积物结合污染物的生物利用度过程。 PCB/DDT 归宿和运输过程的理解将用于评估基于皮肤吸收模型和食物链模型的技术对人类健康的风险益处。 PCB 和 DDT 等沉积物污染物通过污染食物链和直接接触而构成公共健康风险。这项实地研究将评估一种改变沉积物结合能力以减少人类接触此类污染物的新方法的有效性。