Field Testing of Novel Technologies for Restoring Challenging Contaminated Sites

在加拿大，清理受污染场地是一项重大挑战，部分原因是能够有效地将污染降低到安全水平的成本效益技术有限。 当粘土和淤泥等不透水土壤受到污染时，这是一个特别的挑战。 使用纳米级铁修复污染场地已收到显着的关注，部分原因是由于在受控实验室实验中，nZVI快速转化许多污染物的能力。阻碍纳米铁广泛应用的一个问题是其相对较短的反应寿命。为了克服这个问题，项目团队开发了一种新的纳米铁技术，通过硫化来修饰纳米铁表面，从而在实验室实验中将反应寿命延长到一年以上。 另一种有前途的处理技术是利用电动力学将改良剂移入不透水的土壤，在那里它们可以发生反应，降解地下的污染物。 与硫化纳米铁技术类似，项目组在实验室中开发了这项技术，并取得了出色的成果。本研究建议在现场试验这两种技术，以进一步帮助将这些非常有前途的处理技术推广到广泛的现场应用。该现场研究将在陶氏化学位于安大略省萨尼亚的工厂进行，并得到Jacobs、Geosyntec和Arcadis的大力支持。陶氏化学公司在加拿大拥有多个地点，这些地点的地下受到氯化溶剂的影响。开发创新的补救办法是其环境管理计划的一个关键部分。CH2MHill、Geosyntec和Arcadis敏锐地意识到许多客户面临的污染挑战。纳米铁和电动力学的应用有可能满足许多这些挑战。

Cleaning up contaminated sites in Canada is a significant challenge, in part due to the limited cost effective technologies that can efficiently reduce contamination to safe levels. This is a particular challenge when impermeable soils, such as clay and silts, are contaminated. The use of nanoscale iron for remediation of contaminated sites has received significant attention in part due to the ability of nZVI to rapidly transform many contaminants in controlled laboratory experiments. One problem that has hampered the widespread implementation of nanoiron is its relatively short reactive lifespan. To overcome this problem the project team has developed a new nanoiron technology whereby they modify the nanioron surface through sulfurization, thereby increasing the reactive lifespan to greater than a year in laboratory experiments. Another promising treatment technology is the use of electrokinetics to move amendments into impermeable soils where they can react to degrade contaminants in the ground. Similar to the sulfidized nanoiron technology the project team has developed this technology in the laboratory and achieved outstanding results. This study proposes to trial these two technologies in the field to further help bring these very promising treatment technologies to widespread field application. This field study will conducted at Dow Chemical's Sarnia, ON facility with the strong support of Jacobs, Geosyntec and Arcadis. Dow Chemical owns a number of locations in Canada where the subsurface has been impacted by chlorinated solvents. The development of innovative remediation alternatives is a key part of their environmental stewardship plan. CH2MHill, Geosyntec and Arcadis are keenly aware of the contamination challenges that face many of their clients. The application of nanoiron and electrokinetics has the potential to meet many of these challenges.