原位微乳液淋洗强化修复氯代烃污染地下水中试

胡海娟; 莫言阳; 单晖峰; 王永兴; 张左右

doi:10.13205/j.hjgc.202511006

原位微乳液淋洗强化修复氯代烃污染地下水中试

doi: 10.13205/j.hjgc.202511006

1. 江苏大地益源环境修复有限公司, 南京 210012;
2. 吉林大学新能源与环境学院, 长春 130021

基金项目:

国家重点研发计划课题（2020YFC1808205）

详细信息

作者简介:
胡海娟（1986—），女，研究生，高级工程师，主要研究方向为土壤及地下水修复。huhj@jsddbs.com

通讯作者:
单晖峰（1973—），男，博士，正高级工程师，主要研究方向为环境修复技术、药剂、装备。shanhf@jsddbs.com

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出版历程
- 收稿日期: 2024-06-18
- 录用日期: 2024-07-25
- 修回日期: 2024-07-10
- 网络出版日期: 2026-01-09

A pilot study of in-situ microemulsion flushing for enhanced remediation of chlorinated hydrocarbons contaminated groundwater

1. DDBS Environmental Remediation Co., Ltd., Nanjing 210012, China;
2. College of New Energy and Environment, Jilin University, Changchun 130021, China

摘要

摘要: 氯代烃是典型的地下水污染物之一。采用常规的抽出处理技术处理氯代烃后期易产生拖尾现象。表面活性剂强化含水层修复（SEAR）是一种富有前景的修复技术，但在国内工程应用报道较少。在中试规模下，针对氯代烃污染地下水采用原位微乳液淋洗技术执行强化修复，在氯代烃污染区域地面下5~10 m深度注入由3.0% SDS（十二烷基硫酸钠）-7.0% 正丁醇-2.0% KCl组成的淋洗液（即微乳液前驱液），每天注入1 m³，采取边注入边抽出的方式，连续注入14 d。中试监测数据显示，抽出井内淋洗液各成分——SDS、正丁醇、K⁺和Cl^-的浓度在第10~12天达到峰值，对应的淋洗体积约为1倍有效孔隙体积。各氯代烃经原位微乳液淋洗后显著增溶，地下水中的浓度为淋洗前的1.06~86.90倍，呈现出四氯乙烯（PCE）>三氯乙烯（TCE） >氯乙烯（VC） >顺-1，2-二氯乙烯（cis-DCE）的增溶效率差异。氯代烃的疏水性越强，微乳液对氯代烃的增溶效率越高。含水层介质（土壤）中各氯代烃污染物的去除率达到88.81%~100%，表明原位微乳液淋洗能有效脱附土壤中附着的氯代烃。该中试研究实地验证了此微乳液前驱液配方的有效性，对原位微乳液淋洗技术在国内氯代烃污染地下水修复工程中的推广应用具有参考价值。
- 微乳液 /
- 氯代烃 /
- 地下水 /
- 原位淋洗 /
- 表面活性剂 /
- 增溶 /
- 脱附
Abstract: Chlorinated hydrocarbons is one of the typical groundwater contaminants. Conventional pump-and-treat technology is apt to cause a tailing phenomenon in its later stage. Surfactant enhanced aquifer remediation （SEAR） is a promising remediation technology； however， its engineering applications have rarely been reported in China. This study implemented enhanced remediation of chlorinated hydrocarbons contaminated groundwater with in-situ microemulsion flushing at pilot scale， the flushing solution （i.e.， microemulsion precursor） composed of 3.0% SDS（sodium dodecyl sulfate）-7.0% n-butanol-2.0% KCl was injected into 5 to 10 meters deep from ground surface with 1 m³/d for 14 consecutive days in a chlorinated hydrocarbons contaminated zone， in a simultaneous extraction-injection mode. The monitoring data of this pilot showed that the concentration of each component of the flushing solution， i.e.， SDS， n-butanol， potassium ion and chloride ion in the extraction well peaked on the 10th to 12th day， with corresponding flushing volume approximately 1 time of the effective pore volume. Solubility of all the chlorinated hydrocarbons was enhanced through in-situ microemulsion flushing， with groundwater concentration 1.06 to 86.90 times that prior to flushing， and solubilization efficiency was in order of tetrachloroethylene （PCE） > trichloroethylene （TCE） > vinyl chloride （VC） > cis-1，2-dichloroethylene （cis-DCE）. The stronger the hydrophobicity of a chlorinated hydrocarbons， the higher its solubilization efficiency. A removal rate of 88.81% to 100% of various chlorinated hydrocarbons in the aquifer medium （soil） was achieved， indicatingin-situmicroemulsion flushing can effectively desorb chlorinated hydrocarbons in soil. This pilot study demonstrated the effectiveness of the microemulsion precursor formula， and is of reference value for popularization of in-situ microemulsion flushing technology in remediation projects of chlorinated hydrocarbon contaminated groundwater in China.
- microemulsion /
- chlorinated hydrocarbon /
- groundwater /
- in-situ flushing /
- surfactant /
- solubilization /
- desorption

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