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研究报告

Study on the effect of CO₂ leakage on the basic water quality index of paddy field water

摘要：碳捕集与封存（CCS）技术是当前抑制大气中CO₂过快增长的有效方法，但在CCS项目实施过程中仍存在CO₂泄漏而影响地表环境及生态的风险.本研究以龙粳31号和龙稻18号为实验对象，模拟研究地质封存CO₂以不同速率泄漏对稻田水环境基础水质指标D_CO₂、pH、DO和ORP的影响，探讨稻田水对地质封存CO₂泄漏的响应规律.结果表明：CO₂泄漏对稻田水的D_CO₂、pH、DO和ORP长期影响显著，不同CO₂泄漏速率对稻田水质指标的影响差异显著.在各指标平衡后，稻田水各水质指标均呈现明显的日变化规律，其中D_CO₂呈早晚高、午间低的先减后增规律，而pH、DO和ORP均呈早晚低、午间高的先增后减规律.根据各指标差异性分析，建议将稻田水D_CO₂作为稻田系统CO₂泄漏监测的主要指标，将pH、DO、ORP作为CO₂泄漏监测的辅助指标.

Abstract：CO₂ capture and storage (CCS) technology is an effective method to restrain the excessive growth of CO₂ in the atmosphere. However, there are still risks of CO₂ leakage during the implementation of CCS project,which may pose a threat to the surface environment and ecology. In this study, Longjing 31 and Longdao 18 were taken as experimental objects to simulate the leakage of geologic storage CO₂ at different rates and to discuss its effects on the basic water quality indexes of paddy field water, such as D_CO₂, pH, DO and ORP, so as to explore the response rules of paddy field water to geologic storage CO₂ leakage. The results indicated that CO₂ leakage had significant long-term effects on D_CO₂, pH, DO and ORP of water in the paddy field, and different CO₂ leakage rates had significant differences on water quality indexes in the paddy field. After the balance of all indexes, the water quality indexes of paddy field water showed obvious diurnal variations, in which D_CO₂ was high in the morning and evening, and low in noon, while pH, DO and ORP were opposite. According to the difference analysis of each index, it is suggested that D_CO₂ in paddy field water should be taken as the main index of CO₂ leakage monitoring in paddy field system, and pH, DO and ORP should be used as the auxiliary indexes of CO₂ leakage monitoring.