Exploration of the Mechanisms Controlling Emulsion-Based Alkalinity Release during Subsurface Remediation

地下修复过程中乳液碱度释放控制机制探索

• 批准号: 1000714
• 负责人: Andrew Ramsburg
• 金额: $ 20.32万
• 依托单位: Tufts University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1000714&HistoricalAwards=false
• 关键词: Exploration; Mechanisms; Controlling; Emulsion; Based

Controlled delivery and release of amendments is an important concept for improving the science and engineering behind subsurface remediation. Many current approaches to managing groundwater contamination rely on further advances in amendment delivery to initiate and sustain contaminant degradation or immobilization. The PI?s research integrates laboratory experiments across multiple scales to better understand how engineers can control the placement and flux of remedial amendments within the contaminated subsurface environment. Emphasis in this project is placed on the addition of alkalinity using oil-in-water emulsions. Interest in harnessing coupled physical, chemical and biological processes for remediation and stewardship of contaminated sites often necessitates control of pH during treatment and, in some cases, long thereafter. The central hypothesis of this research is that oil-in-water emulsions can be effective tools for modulating alkalinity release during remediation. This project aims to elucidate the mechanisms that control alkalinity release from oil-in-water emulsions designed to contain nano- or submicron-size carbonate and metal oxide particles. Project objectives are: (i) assess mechanisms controlling particle stability within soybean oil; (ii) create and optimize emulsions containing alkalinity release particles within a dispersed soybean oil phase; (iii) elucidate the influence of soybean oil composition on the rate of alkalinity release; and (iv) analyze the ability of oil-in-water emulsions to deliver and release alkalinity for control of groundwater pH. Model Eliciting Activities related to filtration theory and subsurface pH adjustment will be developed and deployed to motivate and engage learners in the geoenvironmental engineering thread of the civil engineering curriculum at Tufts. The PI is committed working with Tufts Center for STEM Diversity - an umbrella organization that coordinates all STEM diversity efforts at Tufts University - to enhance diversity within research and learning environments. Project results will be disseminated to a broad spectrum of students and researchers.

控制交付和释放修正物是改进地下补救背后的科学和工程的一个重要概念。 目前许多管理地下水污染的方法依赖于修正物交付方面的进一步进展，以启动和维持污染物的降解或固定。 私家侦探？的研究整合了多个尺度的实验室实验，以更好地了解工程师如何控制污染地下环境中补救修正物的放置和流量。 本项目的重点是使用水包油乳液添加碱度。 对利用耦合的物理、化学和生物过程对受污染场地进行补救和管理的兴趣，往往需要在处理期间控制pH值，在某些情况下，需要在处理后很长时间内控制pH值。 本研究的中心假设是，水包油乳液可以是有效的工具，用于调节碱度释放在修复过程中。该项目旨在阐明控制水包油乳液中碱度释放的机制，该乳液旨在包含纳米或亚微米尺寸的碳酸盐和金属氧化物颗粒。 项目目标是：（i）评估控制大豆油内颗粒稳定性的机制;（ii）产生并优化分散大豆油相中含有碱度释放颗粒的乳液;（iii）阐明大豆油组合物对碱度释放速率的影响;（iv）分析油包油的能力，将开发与过滤理论和地下pH调节相关的模型激发活动，部署，以激励和参与学习者在塔夫茨大学土木工程课程的地质环境工程线程。 PI致力于与塔夫茨STEM多样性中心合作-一个协调塔夫茨大学所有STEM多样性工作的伞式组织-以增强研究和学习环境中的多样性。项目成果将向广大学生和研究人员传播。