DEVELOPMENT OF IN-SITU MERCURY REMEDIATION APPROACHES BASED ON METHYLMERCURY BIOA

基于甲基汞生物分析法的原位汞修复方法的开发

• 批准号: 8756948
• 负责人: Upal Ghosh
• 金额: $ 16万
• 依托单位: UNIVERSITY OF MARYLAND BALTIMORE COUNTY
• 依托单位国家: 美国
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-15 至 2018-05-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8756948
• 关键词: Address; Advanced Development; Amendment; Area; Beds; Berry; Biological Availability; Biological Preservation; Carbon; Carbon Black; Characteristics; Complex; Databases; Development; Ecosystem; Effectiveness; Environment; Excision; Genes; Genetic; Goals; In Situ; Knowledge; Laboratories; Laboratory Study; Mercury; Methylation; Methylmercury Compounds; Modeling; Molecular Probes; Motivation; Nature; Organism; Performance; Production; Relative (related person); Research; Risk; Role; Sampling; Services; Site; Sodium Chloride; Soil; Structure; Technology; Testing; Time; Work; analytical method; base; cost; demethylation; design; improved; microbial; microbial community; microorganism; novel; public health relevance; remediation; research study; stable isotope; success; superfund site; tool; uptake

DESCRIPTION (provided by applicant): The goal of the proposed study is to advance the development of in situ remediation tools for mercury. There are few available remediation options for Hg contaminated sediments and soils, short of capping and dredging. In situ remediation has not been widely used for mercury, but offers significant advantages in cost and in preservation of ecosystem services especially for large areas with low/moderate levels of contamination. Two recent major advances improve the chances for development of effective in situ remediation options for Hg. First, recent lab and field trials show that in situ activated caron amendments, applied as a thin layer to undisturbed sediments or soils, can significantly reduce MeHg exposure from contaminated sites. Second, the identification of the gene pair responsible for microbial Hg methylation earlier this year (hgcAB) will allow the distribution and activity of Hg- methylating microorganisms in the environment to be established for the first time. Organisms that contain these genes appear to be relatively rare, and their distribution in nature remains unknown. This has the potential to significantly improve models of MeHg production. This research study will take advantage of both of these developments, and several other novel tools, to develop a better understanding of the controls on MeHg production and bioavailability, to develop in situ remediation approaches, and to identify biogeochemical characteristics that may make sites appropriate for these technologies. Using this new information, our goal is to develop an empirical model of the factors influencing Hg and MeHg bioavailability in contaminated areas to: 1) identify characteristics that make Hg- contaminated sites suitable for in situ sorbent remediation, and 2) design sorbent amendment/thin capping strategies that reduce MeHg bioavailability. The main study site will be a salt marsh in Berry's Creek, NJ, where we have just begun a field trial of in situ sorbent remediation using activated carbon. Additional field trials in the Berry's Creek marsh will be done to evaluate the relative efficacy o a wider range of black carbons. This intensive work in Berry's Creek will be supplemented with laboratory microcosm studies using sediments and soils from other Hg-contaminated sites. This approach will be used to evaluate the efficacy of a variety of black carbons across a wider range of biogeochemical and site conditions.

描述（由申请人提供）：拟议的研究的目的是推进汞的原位补救工具的开发。对于汞污染的沉积物和土壤，几乎没有可用的补救选择，缺少封盖和挖泥。原位补救措施尚未被广泛用于汞，而是在成本和保护生态系统服务方面具有显着优势，尤其是对于污染水平较低/中等水平的大面积。最近的两个重大进展提高了HG有效原位补救选择的开发机会。首先，最近的实验室和现场试验表明，原位活化的卡伦修正案（用作薄层薄层）不受干扰的沉积物或土壤，可以显着降低受污染部位的MEHG暴露。其次，今年早些时候负责微生物HG甲基化的基因对的鉴定将使首次建立HG-甲基化微生物的分布和活性。包含这些基因的生物似乎相对较少，它们在自然界中的分布仍然未知。这有可能显着改善MEHG生产模型。这项研究将利用这两种发展以及其他几种新型工具，以更好地了解对MEHG生产和生物利用度的控制，以开发原位补救方法，并确定可能使这些技术适合这些技术的生物地球化学特征。使用这些新信息，我们的目标是开发一个因污染区域中影响HG和MEHG生物利用度的因素的经验模型，以：1）确定使HG污染的地点适合于现场吸附剂修复的特征，以及2）设计吸引人的修订/薄封端策略，以减少Mehg Biohg Biohg biohg biohg biohg biohg。主要研究地点将是新泽西州贝里溪的盐沼，在那里我们刚刚开始使用活性炭进行现场吸附剂修复的现场试验。将在贝瑞溪沼泽中进行的其他现场试验，以评估更广泛的黑色碳水化合物的相对功效。在贝瑞溪（Berry's Creek）的这项密集工作将补充实验室缩影研究，其中使用来自其他受HG污染位点的沉积物和土壤。这种方法将用于评估各种黑色碳在更广泛的生物地球化学和现场条件中的功效。