Bioventing Scale-up Factor

受石油碳氢化合物污染的财产继续受到社会和政府机构的关注。一个原因是需要补救这些受污染的场地，以减轻可能的不利健康问题。另一个原因是补救所有这些地点的主要成本负担，全球范围内从120亿美元到350亿美元不等。生物通风有可能成为一种经济有效的修复技术，只要向土壤中添加最佳的养分和水，以刺激本地微生物群降解石油碳氢化合物。不幸的是，许多为评估生物降解是否可行并确定相关降解率而完成的实验室研究都是在不到500克土壤的情况下完成的。此外，这些研究中的许多都是在实验室污染的土壤上进行的，而不是来自实际现场的陈年污染，因此很难将研究结果转移到现场。因此，将使用100公斤的反应堆进行生物降解研究，以获得降解率并评估放大系数。要研究的参数包括污染物的老化、耗氧量、微生物生长量、水分、pH和对土壤性质的影响。土壤异质性是一个重要的组成部分，并将被纳入其中。从更大规模的实验中获得的降解速率将用于改进先前确定的总体降解相关性，并与之前完成的4公斤研究进行比较，以进一步开发放大系数。总体目标是确定实验室研究中所需的重要场地特征，以确定放大系数，以便更好地估计现场的生物通风性能。这样做将提供一种具有成本效益的方法来恢复加拿大和世界上受石油污染的地点，提供许多就业机会。还将继续将现有的3D SVE模型转换为生物通风模型，该模型将结合开发的降解模型和放大系数。这一模型将为顾问提供一种工具，他们可以通过该工具预测给定地点的生物通风效果，并估计关闭所需的时间，这是网站所有者和政府官员继续提出的问题。最终的结果是，改进的生物通风技术将有助于可持续发展并创造就业机会。

Properties contaminated with petroleum hydrocarbons continue to get the attention of society and government agencies. One reason is the need to remediate these contaminated sites in order to mitigate possible adverse health issues. The other reason is the major cost liability to remediate all these sites, which globally ranges from US $12-$35 billion. Bioventing has the potential to be a cost effective remediation technology, provided the optimum nutrients and water are added to the soil to stimulate the native microbial population to degrade the petroleum hydrocarbons. Unfortunately, many of the laboratory studies completed to assess if biodegradation is feasible and to determine the associated degradation rate have been done with less than 500 g of soil. Furthermore, many of these studies are done on laboratory contaminated soil and not aged contamination from actual field sites, making it difficult to transfer the findings to the field site. Accordingly, biodegradation studies will be done using 100 kg reactors to obtain degradation rates and evaluate the scale-up factor. Parameters to be studied include aging of the contamination, oxygen consumption, amount of microbial growth, water content, pH and impact of soil properties. Soil heterogeneity is an important component and will be incorporated. The degradation rates obtained from the larger scale experiments will be used to refine the overall degradation correlation previously determined and compared with previously completed 4 kg studies to further develop the scale-up factor. The overall goal is to identify the important site characteristics needed in lab studies to establish the scale-up factor so that bioventing performance in the field can be better estimated. Doing so will provide a cost effective means of restoring petroleum contaminated sites in Canada and the world, providing many jobs. Work will also continue on converting an existing 3D SVE model to a bioventing model that will incorporate the developed degradation model and the scale-up factor. This model will give consultants a tool by which they can predict effectiveness of bioventing for a given site and estimate the time needed to attain closure, a question site owners and government officials continue to ask. The end result being, improved bioventing technology that will contribute to sustainability and create job opportunities.