Integrated enhanced natural attenuation approach for risk-based closure of a toluene contaminated site

微生物学家、水文地质学家、环境工程师、水化学家、地球物理学家以及工业伙伴BP和Ecometrix之间已经建立了伙伴关系和多学科合作，目的是在现场范围内整合几种增强衰减方法，以评估这些方法修复裂隙沉积岩中石油碳氢化合物(PHC)污染的可行性。拟议工作的现场地点位于安大略省南部。令人担忧的污染物是甲苯。残留的甲苯影响来自于历史上将该财产用于制造目的，发生在地下2米深处遇到的破裂的白云岩含水层中。在未来五年内，将采取一种综合和新颖的方法来提高岩石基质和羽流中残留甲苯的质量去除率。该研究计划将包括：(1)用于甲苯氧化和甲苯降解微生物群落生物刺激的化学添加；(2)适度提高生物刺激的地下温度的原位加热；以及(3)植物修复。该项目将成为加拿大在以下方面的先例：在仅使用自然衰减的衰减率不能满足法规和/或可持续性标准的情况下，建立修复破碎岩石中的污染物的框架和增强衰减的效力。加拿大受石油碳氢化合物(PHCS)影响的地点规模巨大，仅联邦政府就对近23,000个受污染地点承担责任。因此，开发新的补救方法是必要的，以促进加拿大各地这些未充分利用的土地的重新开发。

A partnership and multidisciplinary collaboration between microbiologists, hydrogeologists, environmental engineers, hydrochemists, geophysical scientists, and industrial partners, BP and Ecometrix has been established with the goal of integrating, at the field-scale, several Enhanced Attenuation approaches in order to assess the viability of these approaches for remediating petroleum hydrocarbon (PHC) contamination in fractured, sedimentary rock. The field site for the proposed work is located in Southern Ontario. The contaminant of concern is toluene. Residual toluene impacts, sourced from historical use of the property for manufacturing purposes, occurs in a fractured dolostone aquifer encountered at depths < 2 metres below ground surface (mbgs). In the next five years, an integrated and novel approach will be taken to augment the rate of mass removal of residual toluene in the rock matrix and plume. The research program will integrate:(1) chemical addition for both oxidation of toluene and biostimulation of toluene-degrading microbial communities;(2) in-situ heating that moderately raises subsurface temperatures for biostimulation; and (3)phytoremediation. This project will be precedent setting in Canada in terms of establishing a framework for remediation of contaminants in fractured rock and the efficacy of Enhanced Attenuation where attenuation rates using natural attenuation alone do not meet regulatory and/or sustainability criteria. The scale of Canadian sites impacted with petroleum hydrocarbon compounds (PHCs) is immense, with the federal Government alone retaining liability for nearly 23,000 contaminated sites. As such, development of new remediation methods is necessary to promote redevelopment of these underutilized lands across Canada.