Long Term Field Experiments in Clayey Aquitards to Examine Chlorinated Solvent Behaviour

在粘土弱透水层进行长期现场实验以检查氯化溶剂的行为

• 批准号: 355823-2013
• 负责人: Parker, Beth
• 金额: $ 2.91万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572666
• 关键词: Long; Term; Field; Experiments; Clayey

This research concerns the study of synthetic organic contaminants, primarily used as industrial cleaning solvents, in clay-rich geological deposits at shallow (< 20 m) depth where the contamination can be a threat to both groundwater resources and the surface environment. Typically, the contamination entered the ground decades ago when leaks and spills of these chemicals were common in nearly all industrial regions of Canada and beyond. Since that time, the chemicals have dissolved and migrated in groundwater flow, and some of the contaminant mass has been transferred by diffusion into very low permeability zones where it has potential to cause exceptionally long-term contamination and impede successful remediation. In this research program, the long-term behaviour of the chemicals will be investigated using well- controlled field experiments in progress at two representative locations in the southern part of Ontario (near Sarnia and Borden). At these locations, colleagues and I initiated field experiments 13-21 years ago, intensely studying the distribution and behaviour of chlorinated solvents that were released or emplaced under controlled conditions, into the subsurface at depths of 2-12 m. In this proposed research, I will return to these two contaminated sites to apply new, advanced laboratory and field methodologies to determine the changes that have occurred over time and which processes govern the spread and attenuation of the contaminants. The emphasis will be on important processes including diffusion, degradation, and sorption. There is reason to expect that degradation caused by microbes has become more active over the past decade, at slow but important rates only quantifiable over such long time periods. This research will improve prospects for predicting the time scales over which this common type of subsurface contamination will persist and cause impacts, and thereby provide an improved basis for decisions about site remediation.

这项研究涉及的合成有机污染物的研究，主要用于工业清洗 在浅层（< 20米）富含粘土的地质沉积物中，污染可能对地下水资源和地表环境构成威胁。通常情况下，污染进入地面几十年前，当泄漏和泄漏的这些化学品是常见的几乎所有工业区的加拿大和超越。自那时以来，这些化学品在地下水流中溶解和迁移，一些污染物通过扩散转移到渗透性极低的地区，有可能造成特别长期的污染，并阻碍成功的补救。 在本研究计划中，将在安大略南部（靠近萨尼亚和博登）的两个代表性地点进行控制良好的现场实验，对化学品的长期行为进行研究。在这些地点，我和同事们在13-21年前开始了实地实验，深入研究了氯化溶剂的分布和行为，这些溶剂在受控条件下释放或放置到地下2-12米深处。在这项拟议的研究中，我将回到这两个污染的网站，应用新的，先进的实验室和现场方法，以确定随着时间的推移发生的变化，以及哪些过程控制污染物的扩散和衰减。重点将放在重要的过程，包括扩散，降解和吸附。有理由预期，在过去十年中，微生物引起的降解变得更加活跃，其速度虽然缓慢，但重要程度只有在如此长的时间内才能量化。这项研究将改善预测这种常见类型的地下污染将持续存在并造成影响的时间尺度的前景，从而为有关场地补救的决定提供更好的基础。