报告题目 ：Integrated life cycle assessment (LCA) and ecosystem modelling for life cycle management of waste streams in oil and gas site remediation
开始时间：2019-06-12 10:30
报告地点：实验17楼303
报告人　：Dr.Junye Wang（加拿大阿萨巴斯卡大学）
主办单位：机械与动力工程学院

Abstract：Canada's abundant oil and gas reserves offer tremendous, long-term potential for economic growth and employment in Alberta and across Canada. However, the growing number of inactive and abandoned wells are creating significant environmental concerns. Optimal well site management in the oil and gas industry is a high priority for the Alberta Government as part of its on-going, foresight study of sustainable resource development and management of cumulative environmental effects. However, in the competitive oil and gas marketplace, it is challenging to improve remediation efficiency and reduce costs of environmental liability while ensuring adequate protection of the environment. The current phased environmental site assessment (ESA) has been a challenge for oil and gas companies because it is affected by a number of factors, including site environment, stakeholders, finances, and regulations to determine their environmental remediation tasks. Given the large number of sites that have been abandoned and inactive for decades, and the dynamic nature of the environmental remediation process, the current system is too costly and inefficient for effective liability management.

In this presentation, we offer an innovative approach of integrated life cycle assessment (LCA) and ecosystem modelling for life cycle management of oil and gas site remediation and their relevant waste streams. The pre-assessments in Phase I and sampling in Phase II are used for identifying key factors and remediation tasks. This approach divides the remediation plans and implementation in Phase III into two interconnected stages: direct cleanup of main contaminates; and follow-up phytoremediation or natural degradation of residual contaminants. Feasibility and costs of alternative cleanup technologies are evaluated using LCA, while their follow-up phytoremediation or natural degradation of the residual contaminants are simulated using a process-based ecosystem model. For the hybrid remediation plans, the total cost can be reduced by increasing a fraction of residual contaminants for low cost phytoremediation or natural degradation. Therefore, this integrated approach can assess the impact of different remediation implementations on the environment and on costs in the phased ESA to help decision-making, while addressing environmental liabilities, controlling operational costs and improving transparency of the planning.