化工学报2011，Vol.62Issue(9)：2600-2607,8.DOI:10.3969/j.issn.0438-1157.2011.09.032
层间地下水污染曝气修复的影响带
Zone of influence of air sparging in interlayer groundwater system
摘要
Abstract
As a cost-efficient enhanced technique, air sparging is used to address subsurface contamination worldwide. It involves the injection of contaminant-free air into the saturated aquifer in an attempt to enhance aerobic biodegradation and induce mass transfer of volatile contaminants into vapor phase. The zone of influence (ZOI) of air sparging (AS) is a critical parameter for the mechanism studies and project designs, which varies with site characterizations. A case study in northeast China featured by a typical interlayer groundwater system contaminated by hydrocarbons was conducted. Air sparging with soil vapor extraction for remediation was performed based on site characterizations. Groundwater level, temperature and dissolved oxygen in groundwater were monitored in field scale during the air sparging running. The spatial and temporal responses of air sparging to the above parameters were analyzed to reflect the environmental effects of remediation activities, and indicate the ZOI. Mathematical methods, including the least square method and double integral were used to determine the theoretical boundary and volume of the ZOI. In addition, a mathematic model was set up to quantify the water inter-flow in the ZOI on the basis of the understanding of groundwater displacement by sparged air. The results showed that the radius of influence in this case was up to 9 m, and the ZOI presented an inverted cone with 362. 04 m3 groundwaterin it before AS. Groundwater was up-lifted to the top of the aquifer and then overflowed to the surrounding area, while the flux rate descended with time and the cumulative flux reached 0. 97 m3 in 6 h. It could be safely concluded that the lateral groundwater movement was not significant in this case. The knowledge from the comprehensive study could provide useful insight into the design efficiency of in situ air sparging and assist in developing and controlling the sparging system, and even tell the fate and transport of the water-air interaction.关键词
层间地下水/曝气修复/影响带Key words
interlayer groundwater/ air sparging/ zone of influence分类
资源环境引用本文复制引用
范伟,杨悦锁,路莹,杜新强,张加双,宋晓明..层间地下水污染曝气修复的影响带[J].化工学报,2011,62(9):2600-2607,8.基金项目
国家高技术研究发展计划项目(2007AA06Z343) （2007AA06Z343）
教育部留学回国人员科研启动基金 （）
吉林大学“创新团队”项目(20082004). （20082004）
