地质封存CO2泄露对地表水中非金属类指标的影响

[目的]探讨地质封存CO_2泄露对地表水中非金属类物质指标的影响,为相关研究提供理论依据。[方法]通过控制二氧化碳泄露时间、泄露速率、泄漏时的温度等条件,分析其对地表水中pH值、溶解氧(DO)、HCO-3和化学需氧量(COD)等指标的影响。[结果]一定时间内,二氧化碳泄露对pH值和DO的影响最大,对HCO-3和COD的影响较小;泄露速率的增大将提高pH,DO,HCO-3的反应速率,即加快pH值和DO的下降,加快了HCO-3的升高;而温度的升高对COD的影响最大。[结论]建议将地质封存CO_2的监测指标选取为地表水中的pH值、DO和HCO-3,因为此三者的变化明显。

Influence on Non-metallic Parameters of Surface Water for Leakage of Carbon Dioxide During Geological Storage

[Objective] Studying the effect of CO₂ leakage during geological storage on non-metallic surface water in order to provide a theoretical basis for the related research. [Methods] By changing the leakage time, leakage rate, and the temperature of carbon dioxide, we studied the impacts on pH value, DO, HCO₃^- and COD of surface water. [Results] The leakage of CO₂ affected pH and DO value greatly, whereas its effects on HCO₃^- and COD were relatively small. Increasing of leakage rate could accelerate the reaction rate of pH, DO and HCO₃^-, thereby pH and DO declined faster, and HCO₃^- increased more quickly. However, temperature rising had the greatest impact on COD content. [Conclusion] It suggests that pH, DO and HCO₃^-, as their sensitive reaction to CO₂, could be used as the surface water monitoring indicators for CO₂ geological storage.