The role of redox biogeochemistry in oxic zone development in the oil sands first reclamation end pit lake, Syncrude Canada's Base Mine Lake.

氧化还原生物地球化学在加拿大 Syncrude 基矿湖油砂第一个填海终坑湖含氧带发育中的作用。

• 批准号: 488301-2015
• 负责人: Warren, Lesley
• 金额: $ 30.78万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=668221
• 关键词: role; redox; biogeochemistry; oxic; zone

Reclamation of oil sands tailings in the Alberta Oil Sands Region is a key industry and Canadian priority. The industry partner in the proposed research, Syncrude Canada Ltd., ranked as the world's largest producer of synthetic crude from oil sands and the biggest single source in Canada, is actively developing innovative strategies to reclaim their tailings. In 2012, Syncrude commissioned Base Mine Lake (BML) to assess water capped tailings technology (WCTT) as a means of tailings disposal. It is expected that in the long term, the lake will develop an oxygenated surface zone with the potential to support higher trophic levels. Based on evidence from existing tailings ponds, there is evidence that microbial biogeochemical cycling of oxygen consuming compounds (OCC) contributed from the tailings layer may reduce BML water cap oxic zone development. However, as this is the first commercial-scale end pit lake (EPL) in the oil sands, the developmental trajectory and outcome in BML are uncertain. The proposed three-year, field-based research will directly address this important knowledge gap. It will characterize (1) BML water cap depth dependent oxygen concentrations, (2) in situ oxygen consumption rates (OCR) and (3) the OCC and biogeochemical processes involved in OCR over spatial, seasonal and annual time scales. The results will identify important microbial and chemical constituents affecting oxic zone early development in BML and determine their impact. Results will thus inform Syncrude's BML research goal to sufficiently understand processes affecting BML's development and ultimate incorporation in the closure landscape such that future EPL applications are well informed. It will benefit Canada through improved environmental management and increased sustainability of oil sands activities and the training of 13 HQP in leading edge, applied environmental sciences. These HQP will develop the critical skills and experience in tailings reclamation that will needed for the future of the oil sands in Canada**********

艾伯塔省油砂地区的油砂尾矿回收是一个关键行业和加拿大的优先事项。这项拟议研究的行业合作伙伴加拿大辛克鲁德有限公司被评为世界上最大的油砂合成原油生产商和加拿大最大的单一来源，该公司正在积极开发创新战略，以回收尾矿。2012年，辛克鲁德委托BaseMineLake(BML)对尾矿水封顶技术(WCTT)作为尾矿处置手段进行了评估。预计从长远来看，该湖将形成一个氧化表层，有可能支持更高的营养水平。根据现有尾矿库的证据，有证据表明，来自尾矿层的耗氧化合物(OCC)的微生物生物地球化学循环可能会减少BML水帽氧化带的发育。然而，由于这是油砂中第一个商业规模的尾坑湖(EPL)，BML的发展轨迹和结果尚不确定。拟议的为期三年的实地研究将直接解决这一重要的知识差距。它将表征(1)BML水帽深度相关的氧浓度，(2)原位耗氧率(OCR)，以及(3)在空间、季节和年度时间尺度上OCC和OCR所涉及的生物地球化学过程。这些结果将确定影响BML中氧化带早期发展的重要微生物和化学成分，并确定它们的影响。因此，结果将为Syncrate的BML研究目标提供信息，以充分了解影响BML开发和最终并入封闭环境的过程，以便更好地了解未来的EPL应用。它将通过改善环境管理、提高油砂活动的可持续性以及对13名总部基地高级管理人员进行前沿应用环境科学方面的培训而受益。这些HQP将发展尾矿回收的关键技能和经验，这将是加拿大油砂未来所需的*