环糊精-乙醇混合溶液在含水层修复中增强PCE的溶解

IF 3.5 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Journal of contaminant hydrology Pub Date : 2025-06-09 DOI:10.1016/j.jconhyd.2025.104646

Min Yuan , Qunfang Wang , Huirong Guo , Panrui Yang , Zhe Wang

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引用次数: 0

摘要

地下水被氯代烃等致密非水相液体（DNAPLs）污染是难以修复的问题。冲洗剂的组合对DNAPLs的去除具有协同增溶作用。然而，DNAPLs在混合冲洗剂处理下的增溶机制尚不清楚。通过一维毛细管实验，观察了四氯乙烯（PCE）在羟丙基-β-环糊精(HPCD)-乙醇混合溶液体系中的溶解过程。混合hpcd -乙醇溶液对PCE的溶解具有协同增溶作用，并推导了PCE的协同增溶函数曲线。此外，在二维（2D）透明微观模型中，使用混合hpcd -乙醇溶液研究PCE的去除过程。结果表明，两种冲洗剂联合使用可显著提高PCE的去除率。混合溶液中PCE的最大溶出率比乙醇或HPCD单溶液体系提高了2-6倍，冲洗时间缩短了40%。

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Enhancing the dissolution of PCE with the mixed cyclodextrin-ethanol solution for aquifer remediation

Groundwater contaminated by dense non-aqueous phase liquids (DNAPLs) such as chlorinated hydrocarbons is difficult to remediate. The combination of flushing agents has a synergistic solubilization effect on the removal of DNAPLs. However, the solubilization mechanisms of DNAPLs under the mixed flushing agent treatment remains poorly understood. In this work, the dissolution process of tetrachloroethylene (PCE) in Hydroxypropyl-β-cyclodextrin (HPCD)-ethanol mixed solution system was observed through one-dimensional (1D) capillary experiments. The mixed HPCD-ethanol solution has a synergistic solubilization effect on PCE dissolution, and the synergistic solubilization function curve of PCE was derived. Furthermore, the mixed HPCD-ethanol solution was used to investigate PCE removal process within a two-dimensional (2D) transparent micromodel. The results demonstrate that the combination of flushing agents significantly enhance PCE removal efficiency. The maximum dissolution rate of PCE under the flushing of the mixed solution was increased by a factor of 2–6 compared to single solution systems of ethanol or HPCD, and the flushing time was reduced by 40 %.

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来源期刊

Journal of contaminant hydrology 环境科学-地球科学综合

CiteScore

6.80

自引率

2.80%

发文量

129

审稿时长

68 days

期刊介绍： The Journal of Contaminant Hydrology is an international journal publishing scientific articles pertaining to the contamination of subsurface water resources. Emphasis is placed on investigations of the physical, chemical, and biological processes influencing the behavior and fate of organic and inorganic contaminants in the unsaturated (vadose) and saturated (groundwater) zones, as well as at groundwater-surface water interfaces. The ecological impacts of contaminants transported both from and to aquifers are of interest. Articles on contamination of surface water only, without a link to groundwater, are out of the scope. Broad latitude is allowed in identifying contaminants of interest, and include legacy and emerging pollutants, nutrients, nanoparticles, pathogenic microorganisms (e.g., bacteria, viruses, protozoa), microplastics, and various constituents associated with energy production (e.g., methane, carbon dioxide, hydrogen sulfide). The journal''s scope embraces a wide range of topics including: experimental investigations of contaminant sorption, diffusion, transformation, volatilization and transport in the surface and subsurface; characterization of soil and aquifer properties only as they influence contaminant behavior; development and testing of mathematical models of contaminant behaviour; innovative techniques for restoration of contaminated sites; development of new tools or techniques for monitoring the extent of soil and groundwater contamination; transformation of contaminants in the hyporheic zone; effects of contaminants traversing the hyporheic zone on surface water and groundwater ecosystems; subsurface carbon sequestration and/or turnover; and migration of fluids associated with energy production into groundwater.