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.

控制和释放修订是改善地下修复背后的科学和工程的重要概念。 当前许多管理地下水污染的方法都取决于修订交付的进一步进步，以启动和维持污染物的退化或固定化。 PI的研究集成了跨多个尺度的实验室实验，以更好地了解工程师如何控制受污染的地下环境中补救修正的放置和通量。 该项目的重点是使用水中乳液添加碱度。 利用耦合的物理，化学和生物学过程进行修复和管理受污染部位的兴趣通常需要在治疗过程中控制pH，在某些情况下很长一段时间。 这项研究的核心假设是，油内乳液可以是调节补救期间碱度释放的有效工具。该项目旨在阐明控制碱性乳液释放的机制，旨在含有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）评估控制大豆油中颗粒稳定性的机制； （ii）在分散大豆阶段内创建并优化包含碱性释放颗粒的乳液； （iii）阐明大豆石油成分对碱度释放速率的影响； （iv）分析油含水乳液的能力传递和释放碱度以控制地下水pH。 将开发和部署与过滤理论和地下pH调整有关的模型活动，以激励和吸引学习者参与簇的土木工程课程的地理环境工程线程。 PI致力于与Tufts STEM多样性中心合作 - 伞组织协调塔夫茨大学的所有STEM多样性工作，以增强研究和学习环境中的多样性。项目结果将被传播到广泛的学生和研究人员中。