Influence of flow velocity and spatial heterogeneity on DNAPL migration in porous media: insights from laboratory experiments and numerical modelling

Zheng, Fei; Gao, Yue; Sun, Yuanyuan; Shi, Xiaoqing; Xu, Hongxia; Wu, Jichun

doi:10.1007/s10040-015-1314-6

Cited by 44 publications

(22 citation statements)

References 41 publications

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“…As expected the spill in the hydrophilic only material resulted in the DNAPL migrating downward with very little lateral spread until it came into contact with the fine grained material at the bottom of the box (Taylor et al 2001, Zheng et al 2015, Zheng et al 2016. As the DNAPL pooled at the bottom of the box it began to spread laterally across the bottom of the box.…”

Section: Discussionsupporting

confidence: 56%

“…This meant that the majority of transducers never came into contact with the DNAPL and the transducers at the bottom of the box were placed too high to record any of the pooling that occurred as the DNAPL came into contact with the fine grained layer. Although the spills in this work were conducted under static conditions, work by Zheng et al (2015) found that in homogeneous media the lateral and vertical migration of a DNAPL spill was significantly altered by increasing flow velocity.…”

Section: Discussionmentioning

confidence: 93%

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Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers

Roberge-Butcher¹

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A series of dense non-aqueous phase liquid (DNAPL) spills was conducted in a twodimensional sand box filled with a variety of media. At the conclusion of the spill, the soil underwent remediation via a waterflood followed by a surfactant flush. Pressure data recorded during the experiments confirmed that DNAPL will be drawn into NAPL-wet lenses and result in negative capillary pressures. The waterflood had little impact on the NAPL distribution. The surfactant flush did reduce the DNAPL-water interfacial tension allowing some of the DNAPL to drain from the NAPL-wet lenses; however a NAPL-saturated layer remained at the bottom of the lenses. It was hypothesized that thickness of the NAPL-saturated layer that remained reflects the capillary pressure difference between the reduced NAPL-entry pressure of the hydrophilic soil below the lens and the reduced water-entry pressure that would allow the DNAPL to drain and water to enter the hydrophobic sand.iii ACKNOWLEDGEMENTS I would like to express my sincere gratitude to my friends, colleagues and family who were by my side for this journey. I would particularly like to thank my supervisor Dr. Paul van Geel without whom this work never would have been completed. His guidance and patience have been greatly appreciated. I would also like to thank my colleagues and the staff at Carleton University; particularly Marie Tudoret Chow, Stanley Conley, Pierre Trudel, and Jason Arnot.In addition, I would like to acknowledge the help of former colleagues Luz A Puentes Jácome and Farah Hasson.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 93%

Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers

Roberge-Butcher¹

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“…Furthermore, Cnudde and Boone [20] proved that image analysis is a reliable technique for rock pore space direct imaging and direct investigation of liquid migration. Therefore, a number of researchers [7], [14]- [17], and [21]- [23] have carried out image analysis techniques for liquid migration experiment. As mentioned by Maas and Hampel [24], image analysis technique in civil engineering field was regularly used to study the object flow absorption and liquid migration of small properties specific to structure crack extension.…”

Section: Regional Conference In Civil Engineering (Rcce)mentioning

confidence: 99%

Investigation of Aqueous and Non-Aqueous Phase Liquids Migration in Fractured Double-Porosity Soil

Foong

Rahman

2017

IJPS

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AbstractThe issue of leakage from underground storage tank and spillage of contaminate liquids can contribute to the aqueous and non-aqueous phase liquids contamination into the groundwater, resulting in groundwater pollution and rendering the quality of groundwater unsafe for consumption. Ensuring availability and sustainable management of water and sanitation for all was the goal and target in the 2030 agenda for sustainable development, consisting of a plan of action for people, planet and prosperity of the United Nations. This paper is intended to investigate the aqueous and non-aqueous phase liquid migrations in the fractured double-porosity soil, which become important for sustainability of groundwater utilisation and a comprehensive understanding of the pattern and behaviour of liquid migration into the groundwater. For this aim, an experiment model was conducted to study the pattern and behaviour of aqueous and non-aqueous phase liquid migration in fractured double-porosity soil using digital image processing technique. Outcome of the experiments show that the fractured double-porosity soil has faster liquid migration at the cracked soil surface condition compared to intact soil surface. It can concluded that the factors that significantly influence the aqueous and non-aqueous phase liquids migration was the soil sample structure, soil sample fractured pattern, physical interaction bonding between the liquid and soil, and the fluid capillary pressure. This study demonstrates that the hue saturation intensity contour plot of liquids migration behaviour can provide detailed information to facilitate researchers and engineers to better understand and simulate the pattern of liquids migration characteristics that influence the groundwater resources.

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“…We speculate that the heterogeneity retarded the vertical infiltration of CB, leading to its extended lateral spread. Compared to the homogeneous porous media, the layered heterogeneous porous media combined with the Fe-Cu/biochar system increased the lateral spread of the CB distribution, thereby lowering the effluent CB concentration [39]. Figures 5 and 6 show the breakthrough curves of the tracer experiments, representing the ratio between the concentration of sodium chloride (NaCl) in the column outlet to its concentration in the column inlet, denoted by ratio between current and initial concentration (C/C 0 ).…”

Section: Released Iron Ion Concentration In Effluentsmentioning

confidence: 99%

Application of Fe-Cu/Biochar System for Chlorobenzene Remediation of Groundwater in Inhomogeneous Aquifers

Zhang

Zhao

et al. 2017

Water

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Chlorobenzene (CB), as a typical Volatile Organic Contaminants (VOC), is toxic, highly persistent and easily migrates in water, posing a significant risk to human health and subsurface ecosystems. Therefore, exploring effective approaches to remediate groundwater contaminated by CB is essential. As an enhanced micro-electrolysis system for CB-contaminated groundwater remediation, this study attempted to couple the iron-copper bimetal with biochar. Two series of columns using sands with different grain diameters were used, consisting of iron, copper and biochar fillings as the permeable reactive barriers (PRBs), to simulate the remediation of CB-contaminated groundwater in homogeneous and heterogeneous aquifers. Regardless of the presence of homogeneous or heterogeneous porous media, the CB concentrations in the effluent from the PRB columns were significantly lower than the natural sandy columns, suggesting that the iron and copper powders coupled with biochar particles could have a significant removal effect compared to the natural sand porous media in the first columns. CB was transported relatively quickly in the heterogeneous porous media, likely due to the fact that the contaminant residence time is proportional to the infiltration velocities in the different types of porous media. The average effluent CB concentrations from the heterogeneous porous media were lower than those from homogeneous porous media. The heterogeneity retarded the vertical infiltration of CB, leading to its extended lateral distribution. During the treatment process, benzene and phenol were observed as the products of CB degradation. The ultimate CB removal efficiency was 61.4% and 68.1%, demonstrating that the simulated PRB system with the mixture of iron, copper and biochar was effective at removing CB from homogeneous and heterogeneous aquifers.

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Influence of flow velocity and spatial heterogeneity on DNAPL migration in porous media: insights from laboratory experiments and numerical modelling

Cited by 44 publications

References 41 publications

Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers

Laboratory investigation of dense non-aqueous phase liquid migration and remediation in mixed wettability soils monitored by pressure transducers

Investigation of Aqueous and Non-Aqueous Phase Liquids Migration in Fractured Double-Porosity Soil

Application of Fe-Cu/Biochar System for Chlorobenzene Remediation of Groundwater in Inhomogeneous Aquifers

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