多孔介质中热蒸汽的迁移特性及其修复氯苯污染土壤的效果

doi:10.13278/j.cnki.jjuese.20180047

吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1431-1437.doi: 10.13278/j.cnki.jjuese.20180047

多孔介质中热蒸汽的迁移特性及其修复氯苯污染土壤的效果

赵勇胜^1,2, 杨元元^1,2, 高鹏龙³, 康学赫^1,2, 王昊颖^1,2, 常月华^1,2

1. 地下水资源与环境教育部重点实验室(吉林大学), 长春 130021;
2. 吉林大学新能源与环境学院, 长春 130021;
3. 国家能源投资集团, 内蒙古鄂尔多斯 017200

收稿日期:2018-03-08 发布日期:2019-10-10
作者简介:赵勇胜(1961-),男,教授,博士生导师,主要从事污染场地控制与修复方面的研究,E-mail:zhaoyongsheng@jlu.edu.cn
基金资助:
国家自然科学基金重点项目（41530636）；吉林大学研究生创新基金项目（2017146）

Migration Characteristics of Steam and Its Remediation to Chlorobenzene Contaminated Soil

Zhao Yongsheng^1,2, Yang Yuanyuan^1,2, Gao Penglong³, Kang Xuehe^1,2, Wang Haoying^1,2, Chang Yuehua^1,2

1. Key Lab of Groundwater Resources and Environment(Jilin University), Ministry of Education, Changchun 130021, China;
2. College of New Energy and Environment, Jilin University, Changchun 130021, China;
3. The National Energy Investment Group, Ordos 017200, Inner Mongolia, China

Received:2018-03-08 Published:2019-10-10
Supported by:
Supported by National Natural Science Foundation of China (41530636) and Graduate Student Innovation Fund Project (2017146)

摘要/Abstract

摘要： 蒸汽注射法是一种新近发展起来并对包气带非水相液体（NAPLs）污染修复具有较好应用前景的修复方法。为了探讨热蒸汽在非饱和多孔介质中的运移特征和蒸汽注射技术修复氯苯污染土壤的效果，本文通过一维模拟柱分别开展了热蒸汽在多孔介质中的迁移规律实验和蒸汽注射修复氯苯实验。研究表明：模拟柱中给定点处温度随时间变化可分为环境温度段、升温段和饱和蒸汽温度段3个阶段，随着温度锋面向下迁移，其迁移速度逐渐减小；模拟柱中的压力分布在蒸汽覆盖区域且空间分布呈线性规律，给定点处的压力随时间先增加后趋于平稳；实验结束后测得的水饱和度随蒸汽迁移距离的增加逐渐增加。在注入蒸汽质量流量为0.3 kg/h和氯苯初始质量分数为56.8 mg/kg的条件下，热蒸汽修复细砂中氯苯3.5 h后去除率达98.0%。模拟柱底部因蒸汽冷凝水达到饱和而产生出流液，出流10 min时出流液中氯苯最大质量浓度达到152.98 mg/L，70 min后出流液中氯苯质量浓度低于7.00 mg/L；介质中氯苯质量分数随距离的增加而增加，最大残留量为0.36 mg/kg。蒸汽注射法有效地改善了SVE（土壤气相抽提）法"拖尾"现象。

关键词: 蒸汽注射, 包气带, 迁移, 氯苯

Abstract: Steam injection is a newly developed and promising soil remediation technology for non-aqueous phase liquids (NAPLs) in a vadose zone. In order to investigate the migration characteristics of hot steam in unsaturated porous media and evaluate the effectiveness of steam injection for remediation of chlorobenzene contaminated soil, the authors carried out a steam migration experiment in porous media and steam injection remediation experiment of chlorobenzene through one-dimensional simulated column. The results indicated that the temperature of the given point in the simulated column can be divided into three stages, namely, the environment temperature stage, the heating stage, and the saturated steam temperature stage. The migration velocity of temperature front decreased with distance. The pressure was distributed in the steam-occupied region, and the spatial distribution was linear, and the pressure showed an increase first and then tended to balance over time in a given location. At the end of the experiment, the water saturation measured gradually increased with the migration distance of the steam. The steam injection flow rate was 0.3 kg/h and initial mass fraction of chlorobenzene was 56.8 mg/kg. The removal rate of chlorobenzene in fine sand by hot steam was 98% after 3.5 h. Outflow was produced at the bottom of the simulated column due to the saturation of steam condensate water. The mass concentration of chlorobenzene in the effluent reached the maximum of 152.98 mg/L after 10 min of outflow; while the concentration of chlorobenzene in the effluent was less than 7 mg/L after 70 min. The concentration of chlorobenzene in the medium increased with the distance, maximum residual amount is 0.36 mg/kg. This result shows that steam injection can effectively improve the smearing in contrast to soil vapor extraction.

Key words: steam injection, vadose zone, transport, chlorobenzene

中图分类号:

赵勇胜, 杨元元, 高鹏龙, 康学赫, 王昊颖, 常月华. 多孔介质中热蒸汽的迁移特性及其修复氯苯污染土壤的效果[J]. 吉林大学学报(地球科学版), 2019, 49(5): 1431-1437.

Zhao Yongsheng, Yang Yuanyuan, Gao Penglong, Kang Xuehe, Wang Haoying, Chang Yuehua. Migration Characteristics of Steam and Its Remediation to Chlorobenzene Contaminated Soil[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1431-1437.

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多孔介质中热蒸汽的迁移特性及其修复氯苯污染土壤的效果

Migration Characteristics of Steam and Its Remediation to Chlorobenzene Contaminated Soil

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