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

与沉积物中存在的化学物质有关的人类健康风险来自以下两种直接接触 或者通过食用从沉积物中积累了化学物质的鱼类和贝类。 我们小组和其他人的实验室规模的研究表明，污染物的传输 通过改变和加强结合和污染物，可以中断途径和生物利用度 天然沉积物的同化能力。这是通过添加吸附剂改进剂来实现的，例如 用于结合持久性有机污染物和天然矿物(如磷灰石、沸石或 用于粘结沉积物中有毒金属的铝土矿。采用这种就地技术的关键障碍 修复方法是对受影响沉积物的改良剂提供有效的输送方法 以及对控制技术有效性的现场物理和生物过程的了解。 本研究项目的主要目的是通过中试规模开发原位修复技术。 旨在解决技术进步中的关键障碍的调查。此字段 研究项目将在两个受到多氯联苯/滴滴涕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 了解湿地环境中多氯联苯/滴滴涕的去向和运输过程如何受到 吸附剂改进剂的应用。生物监测将包括多氯联苯/滴滴涕生物吸收 在野外曝光室和实验室中对淡水寡毛类进行的测量 缩影。物理化学监测将包括水的分配和解吸率 沉积物，这两个指标定义了沉积物结合污染物的生物可利用性过程。这个 将利用对多氯联苯/滴滴涕命运和运输过程的了解来评估人类健康风险受益于 这项技术基于皮肤摄取模型和食物链模型。 沉积物结合污染物，如多氯联苯和滴滴涕，通过污染 通过食物链和直接接触。这项实地研究将评估一部小说的有效性 改变沉积物的结合能力以减少人类接触这类污染物的方法。

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.