Impact of Aged Contamination on Bioventing Performance

老化污染对生物通风性能的影响

• 批准号: RGPIN-2019-03968
• 负责人: Zytner, Richard
• 金额: $ 2.26万
• 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: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=737286
• 关键词: Impact; Aged; Contamination; Bioventing; Performance

Sites contaminated with petroleum hydrocarbons are a challenge worldwide. Site remediation is big business, with owners and governments looking for cost effective, yet environmentally responsible methods to clean up these sites. Bioventing is such a remediation method that it is classified as a biostimulation approach, where nitrogen is added to the soil to stimulate the petroleum degraders in the soil to reduce the petroleum hydrocarbon contamination level. However, studies are needed to determine how aged spills impact remediation efforts. Specifically, how does aging affect the degradation rate, the scale-up factor when extending the lab results to the field and the development of metabolites through the degradation process? Degradation studies using 200 g respirometers and 4 kg reactors will be used to investigate different types of aging procedures and durations using synthetic gasoline. Various bioventing conditions for both reactor sizes will allow determination of the degradation rate when no amendments are added to the soil, evaluation of degradation rate with amendments like nutrients and biochar, extraction efficiency as a function of aging and identification of possible metabolite formation. Comparing the first order degradation rates, along with extraction efficiencies and metabolite formation data will identify the critical factors. The resulting aging data will identify the impact on bioavailability, improving the implementation of bioventing at sites with decades old contamination. The degradation rates obtained from the laboratory experiments will allow development of a 3-D bioventing model. This model will give consultants a tool by which they can predict the 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. Having such a tool can assist with the cost effective remediation of petroleum contaminated sites in Canada and the world, providing many job opportunities.

受石油碳氢化合物污染的场地是全世界面临的挑战。场地修复是一项大生意，业主和政府都在寻找具有成本效益且对环境负责的方法来清理这些场地。生物通风是一种被归类为生物刺激方法的修复方法，其中向土壤中添加氮以刺激土壤中的石油降解剂，从而降低石油烃污染水平。然而，需要研究来确定老化的泄漏如何影响修复工作。具体来说，老化如何影响降解率、将实验室结果推广到现场时的放大系数以及降解过程中代谢物的发展？ 使用 200 克呼吸计和 4 公斤反应器进行的降解研究将用于研究使用合成汽油的不同类型的老化程序和持续时间。两种反应器尺寸的各种生物通风条件将允许确定土壤中未添加任何改良剂时的降解率，评估营养物和生物炭等改良剂的降解率，提取效率作为老化的函数，并识别可能的代谢物形成。比较一级降解率以及提取效率和代谢物形成数据将确定关键因素。由此产生的老化数据将确定对生物利用度的影响，改善数十年污染场所的生物通风实施。 从实验室实验中获得的降解率将有助于开发 3D 生物通风模型。该模型将为顾问提供一个工具，通过该工具，他们可以预测给定站点生物通风的有效性，并估计实现关闭所需的时间，这是站点所有者和政府官员不断提出的问题。拥有这样的工具可以帮助对加拿大和世界各地的石油污染场地进行具有成本效益的修复，并提供许多就业机会。