寒区石油污染场地浅层地下水原位增温强化空气扰动修复

doi:10.11949/j.issn.0438-1157.20180265

化工学报 ›› 2018, Vol. 69 ›› Issue (8): 3701-3710.DOI: 10.11949/j.issn.0438-1157.20180265

寒区石油污染场地浅层地下水原位增温强化空气扰动修复

初彤¹, 杨悦锁^1,2, 路莹¹, 武宇辉¹, 陈煜¹, 杜新强¹

1 吉林大学地下水资源与环境教育部重点实验室, 吉林长春 130021;
2 沈阳大学区域污染环境生态修复教育部重点实验室, 辽宁沈阳 110044

收稿日期:2018-03-14 修回日期:2018-05-10 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: 路莹
基金资助:
中国博士后科学基金资助项目（2014M550175）；国家自然科学基金项目（41602248）。

Thermal enhanced air sparging for oil contamination remediation in shallow groundwater of cold regions

CHU Tong¹, YANG Yuesuo^1,2, LU Ying¹, WU Yuhui¹, CHEN Yu¹, DU Xinqiang¹

1 Key Laboratory of Groundwater Resources and Environment of Ministry of Education, Jilin University, Changchun 130021, Jilin, China;
2 Key Laboratory of Eco-restoration of Regional Contaminated Environment of Ministry of Education, Shenyang University, Shenyang 110044, Liaoning, China

Received:2018-03-14 Revised:2018-05-10 Online:2018-08-05 Published:2018-08-05
Supported by:
supported by the China Postdoctoral Science Foundation (2014M550175) and the National Natural Science Foundation of China (41602248).

摘要/Abstract

摘要：

原位空气扰动技术（air sparging，AS）常被用在治理地下水与土壤的有机污染，在寒区，由于低温环境，污染物传质过程的多种基本参数受到影响，导致修复结果不理想。本文基于野外原位空气扰动实验结果，以甲苯为代表性污染物，进行室内土柱模拟实验，并构建增温空气扰动下污染物迁移模型，对野外场地增温强化空气扰动效果进行模拟，以预测采用增温方式时寒区污染物的去除效果。结果表明，甲苯的挥发速率与温度之间存在正比例关系；在室内柱实验中，高温注气条件下甲苯浓度衰减速率更快；野外数值模拟中的增温强化空气扰动修复过程中温度传导半径为2~4 m，曝气场污染物去除半径达10 m，比非增温强化条件污染物去除范围扩大3~5 m，进而将去除率有效提高40%~50%。

关键词: 曝气, 多相流, 数值模拟, 地下水原位修复, 寒区地下水, 增温强化

Abstract:

Air sparging(AS) is often used to treat organic pollution in groundwater and soil, while the remediation efficiency would be restricted by complex field conditions such as low temperature in cold regions. Based on the results of AS pilot test in the field, taking toluene as a representative pollutant, the remediation effect of thermal enhanced air sparging for the field scale was predicted and evaluated by indoor soil column experiment and numerical modelling. The results show that there is a direct proportional relationship between the volatilization rate of toluene and temperature. In the soil column experiments, the toluene concentration decay faster under the condition of AS with high temperature gas injection. Numerical simulation of thermal enhanced air sparging for field site shows that the conduction radius of temperature is 2-4 m and the influence scope of the pollutants could expand to the area within a 10 m radius, which is about 40%-50% larger than normal AS in winter.

Key words: aeration, multiphase flow, numerical simulation, groundwater in situ repair, groundwater in cold region, thermal enhanced

中图分类号:

X523

初彤, 杨悦锁, 路莹, 武宇辉, 陈煜, 杜新强. 寒区石油污染场地浅层地下水原位增温强化空气扰动修复[J]. 化工学报, 2018, 69(8): 3701-3710.

CHU Tong, YANG Yuesuo, LU Ying, WU Yuhui, CHEN Yu, DU Xinqiang. Thermal enhanced air sparging for oil contamination remediation in shallow groundwater of cold regions[J]. CIESC Journal, 2018, 69(8): 3701-3710.

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寒区石油污染场地浅层地下水原位增温强化空气扰动修复

Thermal enhanced air sparging for oil contamination remediation in shallow groundwater of cold regions

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