CO2泄漏对稻田水基础水质指标的影响研究  

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

作　　者：刘丹 马俊杰[1,2] 程萌 吴宁 薛璐 赵晨阳[1] LIU Dan;MA Junjie;CHENG Meng;WU Ning;XUE Lu;ZHAO Chenyang(College of Urban and Environmental Science,Northwestern University,Xi'an 710000;National&Local Joint Engineering Research Center of Carbon Capture and Storage Technology,Xi'an 710000)

机构地区：[1]西北大学,城市与环境学院,西安710000 [2]二氧化碳捕集与封存国家与地方工程研究中心,西安710000

出　　处：《环境科学学报》2020年第4期1298-1308,共11页Acta Scientiae Circumstantiae

基　　金：国家高技术研究发展计划(863计划)(No.2012AA0501030)。

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DCO2、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DCO2、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DCO2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DCO2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.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 DCO2, 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 DCO2, 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 DCO2 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 DCO2 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.

关 键 词：CCS CO2泄漏 稻田水 水质指标 

分 类 号：X835[环境科学与工程—环境工程]