南京大学学报(自然科学版) ›› 2021, Vol. 57 ›› Issue (3): 426–436.doi: 10.13232/j.cnki.jnju.2021.03.010

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盐度对PCE在饱水单裂隙中运移分布及质量溶出的影响

刘艺超, 陆玥, 徐红霞, 孙媛媛(), 吴吉春()   

  1. 表生地球化学教育部重点实验室，南京大学地球科学与工程学院，南京，210023
  • 收稿日期:2021-01-19 出版日期:2021-06-08 发布日期:2021-06-08
  • 通讯作者: 孙媛媛,吴吉春 E-mail:sunyy@nju.edu.cn
  • 作者简介:E⁃mail：sunyy@nju.edu.cn，jcwu@nju.edu.cn
  • 基金资助:
    国家自然科学基金重点项目(41730856)

The influence of salinity on the migration distribution and mass dissolution in saturated single fissure

Yichao Liu, Yue Lu, Hongxia Xu, Yuanyuan Sun(), Jichun Wu()   

  1. Key Laboratory of Surficial Geochemistry Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China
  • Received:2021-01-19 Online:2021-06-08 Published:2021-06-08
  • Contact: Yuanyuan Sun,Jichun Wu E-mail:sunyy@nju.edu.cn

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摘要：

为研究盐度对重非水相液体（dense non?aqueous liquid，DNAPL）污染物在饱水单裂隙中运移分布以及溶出行为的影响，选取四氯乙烯（perchlorethylene，PCE）作为代表性DNAPL，通过改变流经裂隙介质中盐溶液浓度，测定不同盐度条件下PCE/水/裂隙介质三相体系中界面张力和接触角，并用光透法实时监测PCE在二维裂隙介质中运移分布的动态变化过程，同时用气相?顶空色谱分析法测定PCE溶出浓度，进一步对比分析不同情形下相应污染源区结构及PCE溶出浓度变化.结果表明：随着盐度增加，PCE/水/裂隙介质三相体系中界面张力增大，而接触角减小.盐度通过改变PCE/水/裂隙介质三相体系中界面张力和接触角，从而影响PCE在裂隙介质中的运移及分布，具体表现为在高盐度水流中PCE运移速率加快，分布面积增大.此外，盐度通过影响PCE污染源区面积从而影响PCE溶出浓度，且污染源区面积与溶出浓度表现出明显的正相关性，均先迅速增大而后趋于平稳；高流速水流条件会增大盐度的影响程度.

关键词: 四氯乙烯, 透射光法, 运移, 污染源区结构, 质量溶出

Abstract:

This study investigated the influence of salinity on the migration,distribution and dissolution of dense non?aqueous liquid (DNAPL) in saturated single fracture. Tetrachloroethylene (PCE) was selected as the representative,and measurement of interfacial tensions (IFTs) and contact angles for the PCE/water/fractured media system were conducted under different salinity. The migration and distribution process of PCE in simulated fractured media were dynamically monitored by light transmission method,while the PCE dissolution was determined with headspace gas chromatograph. This experiments were carried out at different water salinities and velocities,and the corresponding changes in source zone architecture and dissolution concentration were then analyzed. Results showed that with the increase of water salinity,the IFTs increased and the contact angles of PCE decreased,and thereby affected the migration and distribution of PCE in the fractured media. The migration rate of PCE and the PCE source zone area were observed to increase with salinity increasing. Moreover,the variation in PCE distribution induced by different salinities further changed the dissolution of PCE. The changes of the PCE source area and the dissolved concentration showed obvious consistency,both of which first increased rapidly and then stabilized,and the influence of salinity increased with flow velocity.

Key words: PCE, light transmission method, migration, source zone architecture, dissolution

中图分类号: 

  • P641

图1

(a)裂隙装置及水流系统；(b) 左右铝框俯视图；(c) 腔体设计正视图与俯视图"

图2

透射光监测系统示意图"

图3

PCE/水/裂隙介质三相体系下的界面张力及接触角随NaCl浓度的变化关系图（a）和PCE的溶解度与NaCl浓度的关系图(b)"

图4

运移?再分布过程中PCE的饱和度分布图"

表1

PCE在饱水单裂隙中的运移及分布特征"

计算量1 m·d-110 m·d-1
L?1L?2H?1H?2
PCE污染源区的平均饱和度0.800.760.840.78
裂隙介质中内的PCE体积（mL）0.9400.9660.9130.948
PCE运移速率（m·d-1）9.07012.214.519.4

图5

运移分布过程中PCE饱和度频率分布直方图"

图6

PCE污染源区内空间展布范围的时间关系图"

图7

PCE溶出浓度值随时间的变化"

图8

PCE污染源区面积随时间的变化"

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