UNS: Engineered Nanomaterial Impact on Long-Term Stability of MSW Landfill and Leachate Treatment Pond Geomembrane Liners

UNS：工程纳米材料对城市固体废弃物填埋场和渗滤液处理池土工膜衬垫长期稳定性的影响

• 批准号: 1510869
• 负责人: Nicole Berge
• 金额: $ 32.99万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-03-15 至 2022-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1510869&HistoricalAwards=false
• 关键词: UNS; Engineered; Nanomaterial; Impact; Long

1510869Berge As engineered nanomaterial-containing products reach the end of their useful life, they will likely reside in municipal solid waste landfills. Work conducted in the principal investigator's (PI's) laboratory at the University of South Carolina suggests that the mobility of carbon nanotubes, examples of engineered nanomaterials, may be significant in waste environments containing "mature" leachate (consisting primarily of humic acid). The main goal of this research is to conduct experiments and perform molecular modeling simulations to understand the implications associated with engineered nanomaterial-geomembrane interactions in municipal solid waste landfills.Engineered nanomaterial production continues to increase: therefore it is inevitable that engineered nanomaterial-containing products/wastes will end up in landfills. Unfortunately, there are no processes or research to evaluate whether currently designed and operating landfills and leachate treatment/storage ponds can adequately manage/contain these materials. Of particular importance is the understanding of how engineered nanomaterials may interact with the geosynthetics present in the liners. This work will elucidate the impact of engineered nanomaterials on high-density polyethylene geomembranes and importantly, how they may influence geomembrane durability/service lives. This research is transformative in that it is the first study in which engineered nanomaterial-high-density polyethylene liner interactions will be explored. Results will provide necessary information to assess whether current solid waste management processes are adequate to safely manage/contain such wastes. The research results will be widely disseminated via presentations and publications. This project is guided by the hypothesis that engineered nanomaterials will influence long-term stability of geomembranes by increasing antioxidant release/depletion. The nature of engineered nanomaterial influences on geomembranes are dependent on material application (e.g., landfill bottom liner or leachate storage pond) and environmental conditions (e.g., oxygen presence). The specific objectives of this work are: (1) Elucidate how selected engineered nanomaterials influence polymer oxidation, antioxidant diffusion, and subsequent changes in mechanical behavior of high-density polyethylene liners; (2) Understand how engineered nanomaterial surface chemistry influences polymer oxidation and antioxidant diffusion; and, (3) Perform molecular level simulations to calculate adsorption/partitioning coefficients, quantify diffusion coefficients, and calculate reaction kinetics for oxidation reactions, and develop a process model to quantify the effects of engineered nanomaterials on antioxidant depletion in high-density polyethylene liners. The PI is committed to promoting teaching, training, and learning while conducting this research. The broader impacts plan is comprised of three components: (1) K-12 outreach; (2) undergraduate research experiences for underrepresented populations in engineering; and, (3) doctoral student mentoring. It is anticipated that a large population of potential future engineers and scientists can be reached through these planned activities.

1510869Berge 当含有工程纳米材料的产品达到其使用寿命时，它们可能会被存放在城市固体废物填埋场。南卡罗来纳大学首席研究员 (PI) 实验室进行的工作表明，碳纳米管（工程纳米材料的例子）的流动性在含有“成熟”渗滤液（主要由腐殖酸组成）的废物环境中可能具有重要意义。这项研究的主要目标是进行实验并进行分子建模模拟，以了解城市固体废物填埋场中工程纳米材料与土工膜相互作用的影响。工程纳米材料的产量不断增加：因此，含有工程纳米材料的产品/废物最终将进入垃圾填埋场。不幸的是，没有流程或研究来评估当前设计和运营的垃圾填埋场和渗滤液处理/储存池是否能够充分管理/容纳这些材料。特别重要的是了解工程纳米材料如何与衬垫中的土工合成材料相互作用。这项工作将阐明工程纳米材料对高密度聚乙烯土工膜的影响，重要的是，它们如何影响土工膜的耐用性/使用寿命。这项研究具有变革性，因为它是第一个探索工程纳米材料与高密度聚乙烯内衬相互作用的研究。结果将提供必要的信息，以评估当前的固体废物管理流程是否足以安全地管理/遏制此类废物。研究结果将通过演讲和出版物广泛传播。该项目的假设是，工程纳米材料将通过增加抗氧化剂的释放/消耗来影响土工膜的长期稳定性。工程纳米材料对土工膜影响的性质取决于材料应用（例如垃圾填埋场底部衬垫或渗滤液存储池）和环境条件（例如氧气的存在）。这项工作的具体目标是：（1）阐明所选的工程纳米材料如何影响聚合物氧化、抗氧化剂扩散以及高密度聚乙烯内衬机械行为的后续变化； (2) 了解工程纳米材料表面化学如何影响聚合物氧化和抗氧化剂扩散； (3) 进行分子水平模拟以计算吸附/分配系数、量化扩散系数并计算氧化反应的反应动力学，并开发过程模型以量化工程纳米材料对高密度聚乙烯内衬中抗氧化剂消耗的影响。 PI 致力于在开展这项研究的同时促进教学、培训和学习。更广泛的影响计划由三个部分组成：(1) K-12 外展； (2) 工程领域代表性不足人群的本科研究经验； (3) 博士生指导。预计通过这些计划的活动可以接触到大量潜在的未来工程师和科学家。