空气雾化修复过程中不同介质均质含水层水力循环形成机制及其对硝基苯迁移的影响

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

Journal of contaminant hydrology Pub Date : 2025-03-01 DOI:10.1016/j.jconhyd.2025.104529

Xuyang Chen , Meng Yao , Liming Ren , Wei Du , Linchao Hu , Bowen Li , Mingxin Wang

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引用次数: 0

摘要

众所周知，在空气喷射（AS）期间，孔隙水流动会给含水层的修复效果和程度带来不确定性。采用透光可视化技术研究了AS过程中液压循环迁移行为、影响因素及其对硝基苯迁移的影响。实验结果表明，当空气注入量(Q)超过临界阈值（Qc）时，孔隙水渗流会诱发不同介质均质含水层的水力循环。研究发现，中等砂层的Qc值约为300 L/h，粗砂层为100 L/h，砾石含水层为0.5 L/h。结果表明，水力循环流速与Q呈线性正相关，影响区（ZOI）面积与Q呈对数相关。在粗砂含水层中，连续渠化流动阻碍了污染物从左侧向右侧水力循环区迁移。相比之下，在砾石含水层中，不连续的气泡流允许污染物在层间迁移，这增加了污染物羽流范围扩大的风险。在中粗砂含水层中，水力循环主要由烟囱效应引起，而在砾石含水层中，振荡气泡效应明显。这一现象解释了为什么砾石含水层的水力循环效果优于中、粗砂含水层。这些发现将有助于扩展修复机制，实现精确修复，提高AS技术的污染物去除能力。

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Formation mechanisms of hydraulic circulation and its effects on the nitrobenzene migration in homogeneous aquifers with different medium sizes during air sparging remediation

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Formation mechanisms of hydraulic circulation and its effects on the nitrobenzene migration in homogeneous aquifers with different medium sizes during air sparging remediation

Porewater flow is known to introduce uncertainty in the effectiveness and extent of remediation in aquifers during air sparging (AS). In this study, the hydraulic circulation migration behavior, influencing factors, and its effects on nitrobenzene transport in AS process were investigated using light transmission visualization technology. Experimental results showed that when the air injection rate (Q) exceeded a critical threshold (Qc), porewater flow induced hydraulic circulation in homogeneous aquifers with different medium sizes. The values of Qc were found to be approximately 300 L/h for medium sand, 100 L/h for coarse sand, and 0.5 L/h for gravel aquifers. It was observed that the flow velocity of hydraulic circulation was linearly positively correlated with Q, while the zone of influence (ZOI) area was logarithmically correlated with Q. In aquifers with coarse sand, continuous channelized flow was seen to impede contaminant migration from the left to the right hydraulic circulation zone. In contrast, in gravel aquifers, discontinuous bubbly flow allowed contaminants to migrate between zones, which increased the risk of expanding the contaminant plume's range. Moreover, in aquifers with medium and coarse sand, hydraulic circulation was mainly caused by the chimney effect, whereas in gravel aquifers, oscillating bubble effects were notably observed. This observation explained why the hydraulic circulation effect in gravel aquifers was superior compared to that in medium and coarse sand aquifers. These findings are expected to contribute to expanding the remediation mechanisms, achieving precise remediation, and improving contaminant removal in AS technology.

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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.