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Mitigating GHG emissions from oil sands tailings through redox processes

通过氧化还原过程减少油砂尾矿的温室气体排放

基本信息

批准号：
543693-2019
负责人：
Siddique, Tariq
金额：
$ 9.27万
依托单位：
University of Alberta
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2020
资助国家：
加拿大
起止时间：
2020-01-01 至 2021-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=699687
关键词：
Mitigating GHG emissions oil sands

项目摘要

Surface mining of oil sands has a significant environmental footprint. Currently tailings ponds contain more than 1 billion m3 of fluid fine tailings (FFT) that need to be reclaimed. Expression of porewater from settling FFT contributes oil sands process-affected water to the water cap volume and chemistry. Tailings ponds are anaerobic and harbor microbial communities that degrade residual hydrocarbons in FFT producing greenhouse gases (GHG), primarily methane. Similarly, methanogenesis can continue in end-pit lakes where FFT is reclaimed under water and the conditions are aerobic near the surface. The overarching objective of this current project is to reduce net GHG emissions. A two-pronged strategy will be employed: 1) to understand the role of iron minerals and other redox compounds (nitrate and sulfate) in the inhibition of methanogenesis and 2) to understand the roles of these alternative electron acceptors, along with molecular oxygen (O2), in the oxidation of produced methane. Exploring the metabolic potential of indigenous microorganisms and investigating linkages between methanogenesis and iron, nitrogen, and sulfur cycling in the FFT will help develop strategies that will include in situ amendments of redox compounds and ex-situ application of redox processes to inhibit methanogenesis and stimulate methane oxidation. The approach will mitigate GHG emissions from tailings ponds and future end-pit lakes in the Athabasca Oil Sands region in Alberta, Canada.

油砂的露天开采对环境造成了重大影响。目前，尾矿库中有超过10亿立方米的流体细尾砂（FFT）需要回收。沉淀FFT孔隙水的表达将油砂过程影响的水贡献给了水帽体积和化学性质。尾矿库是厌氧的，是微生物群落的栖息地，它们降解FFT中残留的碳氢化合物，产生温室气体（GHG），主要是甲烷。同样地，在FFT在水下回收，近地表条件为好氧的端坑湖泊中，甲烷生成可以继续进行。当前项目的首要目标是减少温室气体净排放。将采用双管齐下的策略：1)了解铁矿物和其他氧化还原化合物（硝酸盐和硫酸盐）在抑制甲烷生成中的作用；2)了解这些替代电子受体以及分子氧（O2）在生成甲烷氧化中的作用。探索本地微生物的代谢潜力，研究甲烷生成与FFT中铁、氮和硫循环之间的联系，将有助于制定策略，包括氧化还原化合物的原位修正和氧化还原过程的非原位应用，以抑制甲烷生成和刺激甲烷氧化。该方法将减少加拿大阿尔伯塔省阿萨巴斯卡油砂地区尾矿池和未来终端坑湖的温室气体排放。