Bioventing Scale-up Factor

受石油烃污染的物业继续受到社会和政府机构的关注。一个原因是需要修复这些受污染的场地，以减轻可能出现的不利健康问题。另一个原因是修复所有这些场地的主要成本责任，在全球范围内为120亿至350亿美元。如果向土壤中添加最佳的营养物和水，刺激原生微生物群降解石油碳氢化合物，那么生物通风技术有可能成为一种经济有效的修复技术。不幸的是，为评估生物降解是否可行和确定相关降解率而完成的许多实验室研究都是在少于500克的土壤上进行的。此外，这些研究中有许多是在实验室污染土壤上进行的，而不是在实际现场的陈旧污染上进行的，因此很难将研究结果转移到现场。因此，将使用100公斤的反应器进行生物降解研究，以获得降解率并评估放大系数。待研究的参数包括污染物的老化、耗氧量、微生物生长量、含水量、pH值和对土壤性质的影响。土壤异质性是一个重要的组成部分，将被纳入。从大规模实验中获得的降解率将用于细化先前确定的整体降解相关性，并与先前完成的4公斤研究进行比较，以进一步开发放大因子。总体目标是确定实验室研究中需要的重要场地特征，以建立放大因子，以便更好地估计现场的生物通风性能。这样做将提供一种经济有效的方法来修复加拿大和世界上受石油污染的地点，并提供许多就业机会。还将继续将现有的3D SVE模型转换为生物排气模型，该模型将纳入已开发的降解模型和放大因子。该模型将为顾问提供一种工具，通过该工具，他们可以预测特定地点生物通风的有效性，并估计达到关闭所需的时间，这是网站所有者和政府官员不断提出的问题。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.