引用本文:杨洋,赵传军,李娟,白顺果,席北斗,唐军,吕宁磬,等.低温条件下基于TMVOC的土壤气相抽提技术数值模拟[J].环境科学研究,2017,30(10):1587-1596.
YANG Yang,ZHAO Chuanjun,LI Juan,BAI Shunguo,XI Beidou,TANG Jun,LÜ Ningqing,et al.Numerical Simulation through SVE Technique based on TMVOC under Low Temperature[J].Reserrch of Environmental Science,2017,30(10):1587-1596.]
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低温条件下基于TMVOC的土壤气相抽提技术数值模拟
杨 洋1,2, 赵传军2,3, 李 娟2, 白顺果3, 席北斗2, 唐 军2, 吕宁磬2
1.北京师范大学环境学院, 北京 100875 ;2.中国环境科学研究院, 环境基准与风险评估国家重点实验室, 北京 100012 ;3.河北农业大学城乡建设学院, 河北 保定 071001
摘要:
为研究低温条件下土壤气相抽提技术对包气带中苯系物的去除效果、解决修复技术有效性评估等难题,基于TMVOC模型模拟砂箱试验,从浓度梯度、相间转化、饱和度变化等方面分析土壤气相抽提技术对污染物空间分布规律的影响机理.结果表明,TMVOC模拟苯系物浓度的计算值与试验测量值的拟合效果较好;低温条件下,砂箱土体中苯、甲苯、乙苯、邻二甲苯的去除率分别为89.8%、71.3%、29.7%、14.4%.两次抽提过程中,苯在"气-液-NAPL(non-aqueous phase liquid)"三相中的质量均减少,减少比例近似为2:7:1,苯在液相中的质量减幅最大;在间歇期,苯由"NAPL相"以近似3:7的比例向"气、液"两相运移.在砂箱土体上部和中部NAPL相饱和度保持为0,"气-液"两相共存,间接表明苯系物在"气-液"两相间发生运移;在砂箱土体底部污染源附近"气-液-NAPL"相共存,间接表明苯系物在"气-液-NAPL"相间发生运移,抽提作用使得气相与液相饱和度升高、NAPL相饱和度降低.
关键词:  苯系物  土壤气相抽提技术  低温条件  TMVOC模型
DOI:10.13198/j.issn.1001-6929.2017.02.87
分类号:
基金项目:环境基准与风险评估国家重点实验室自由探索基金;环境保护部工作类项目(144130012110302)
Numerical Simulation through SVE Technique based on TMVOC under Low Temperature
YANG Yang1,2, ZHAO Chuanjun2,3, LI Juan2, BAI Shunguo3, XI Beidou2, TANG Jun2, LÜ Ningqing2
1.School of Environment, Beijing Normal University, Beijing 100875, China ;2.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China ;3.Institute of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China
Abstract:
In order to study the soil vapor extraction (SVE) technique remediation effect of BTEX contaminated vadose zone under low temperature, the SVE effect on BTEX migration mechanism was analyzed through concentration gradient, transformation among phases and saturation variation based on the TMVOC model. The TMVOC simulation results of BTEX showed that the simulation results were similar with experimental data. The SVE removal rates of benzene, toluene, ethylbenzene and o-xylene were 89.8%, 71.3%, 29.7%, and 14.4% respectively under low temperature. In two extraction processes, the mass of benzene in gas-aqueous-NAPL phases decreased, and the reduced proportion of benzene in gas-aqueous-NAPL phases was approximately 2:7:1. Most benzene mass reduction was in aqueous phase. During the intermittent period between the two extraction processes, benzene migrated from NAPL phase to gas and aqueous phase, and the distribution ratio was 3:7. In the upper and central sections of the sandbox, the NAPL phase saturation was 0, which indirectly reflected benzene migration between the gas and aqueous phase. In the bottom section of the sandbox, gas, aqueous and NAPL phase coexisted, which indirectly reflected SVE promoting BTEX migration among gas, aqueous and NAPL phase. SVE promoted an increase in the gas and aqueous phase saturation, and a decrease in the NAPL phase saturation.
Key words:  BTEX  soil vapor extraction  low temperature conditions  TMVOC model