Electrical permittivity and resistivity time lapses of multiphase DNAPLs in a lab test

Orlando, Luciana; Renzi, Beatrice

doi:10.1002/2014wr015291

Cited by 20 publications

(14 citation statements)

References 29 publications

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“…Revil and Mahardika [] demonstrated that seismoelectric effects could be used to identify the position of a NAPL‐water encroachment front. Orlando and Renzi [] have shown that DNAPL and the dissolved plume both affect electrical resistivity and permittivity.…”

Section: The Organic Napl Sourcementioning

confidence: 99%

Organic contaminant transport and fate in the subsurface: Evolution of knowledge and understanding

Essaid

Bekins

Cozzarelli

2015

Water Resources Research

155

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Toxic organic contaminants may enter the subsurface as slightly soluble and volatile nonaqueous phase liquids (NAPLs) or as dissolved solutes resulting in contaminant plumes emanating from the source zone. A large body of research published in Water Resources Research has been devoted to characterizing and understanding processes controlling the transport and fate of these organic contaminants and the effectiveness of natural attenuation, bioremediation, and other remedial technologies. These contributions include studies of NAPL flow, entrapment, and interphase mass transfer that have advanced from the analysis of simple systems with uniform properties and equilibrium contaminant phase partitioning to complex systems with pore-scale and macroscale heterogeneity and rate-limited interphase mass transfer. Understanding of the fate of dissolved organic plumes has advanced from when biodegradation was thought to require oxygen to recognition of the importance of anaerobic biodegradation, multiple redox zones, microbial enzyme kinetics, and mixing of organic contaminants and electron acceptors at plume fringes. Challenges remain in understanding the impacts of physical, chemical, biological, and hydrogeological heterogeneity, pore-scale interactions, and mixing on the fate of organic contaminants. Further effort is needed to successfully incorporate these processes into field-scale predictions of transport and fate. Regulations have greatly reduced the frequency of new point-source contamination problems; however, remediation at many legacy plumes remains challenging. A number of fields of current relevance are benefiting from research advances from point-source contaminant research. These include geologic carbon sequestration, nonpoint-source contamination, aquifer storage and recovery, the fate of contaminants from oil and gas development, and enhanced bioremediation.

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Section: The Organic Napl Sourcementioning

confidence: 99%

Organic contaminant transport and fate in the subsurface: Evolution of knowledge and understanding

Essaid

Bekins

Cozzarelli

2015

Water Resources Research

155

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“…The information gained from non-intrusive geophysical methods, in conjunction with water sampling, shows the potential in exploring the contamination extent, with time and cost savings in mind 6,7 . The significance of a detailed characterization and precise mapping of the source and distribution of contamination for a remediation project has been increasingly acknowledged by scientific community 8,9 .…”

Section: Introductionmentioning

confidence: 99%

Complex resistivity characteristics of saltwater-intruded sand contaminated by heavy metal

Nai

Sun

Wang

et al. 2019

Sci Rep

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Different pollutants affect electrical characteristics of soil, e.g., electric resistivity and capacity. The most extensively used non-intrusive methods in mapping these physical characteristics are electrical method. To better understand the effect of different hydrogeological and environmental process on resistivity and phase of complex resistivity under water-saturated soil, we carried out a controlled laboratory experiment where the host material was simulated by sand soil and the hydrogeological and environmental processes by groundwater table rise, seawater intrusion and heavy metal contamination. The experiment measured the resistivity and phase of soil saturated and unsaturated, with different pollutants added, together with their time-lapse change in a well-controlled column. With the involvement of more measurement parameters, complex resistivity method can provide more information than resistivity method, thereby having better performance in the detection and monitoring of changes in electrical properties of complex contaminated sites. For example, it is capable of discriminating the different contamination process, in this case, e.g., seawater intrusion and heavy metal contamination. In addition, it is still sensitive to the change of pollutant concentration even in site with high added concentration. Furthermore, simulating the saltwater-intruded site contaminated by manganese, it was found that the change of resistivity (ρ) can hardly be observed, while the responses of phase (φ) are so obvious that can be clearly observed.

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“…In the past, several different geophysical techniques, such as ground‐penetrating radar (GPR), electrical resistivity, induced polarization (IP) and spontaneous potential have been used, both in controlled environment (Weller, Gruhne, Seichter and Börner ; Chambers, Loke, Ogilvy and Meldrum ; Bano, Loeffler and Girard ; Orlando and Renzi , ; Mao et al . ) and in the field (Brewster and Annan ; Dahlin, Bernstone and Loke ; Orlando ; Bradford, Rathfelder, Lang and Abriola ; Ikard, Revil, Jardani Woodruff, Parekh and Mooney ), with the aim to test the effectiveness of geophysical methods in the characterization of a contaminated environment.…”

Section: Introductionmentioning

confidence: 99%

“…In the end, studies conducted in a controlled cell (Bano et al . ; Orlando and Renzi , , Deng et al . ) and in the field (Brewster and Annan, ; Bradford et al .…”

Section: Introductionmentioning

confidence: 99%

“…We took into account some aspects of these questions in previous researches (Orlando and Renzi , ) that were based on geophysical measurements collected in laboratory on a built sandbox. The studies showed that the geophysical measurements change over time confirming that the hydrofluoroether interacts with the host sediment and water inducing variations on the physical parameter of the mixture.…”

Section: Introductionmentioning

confidence: 99%

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Time‐lapse laboratory tests to monitor multiple phases of DNAPL in a porous medium

Orlando

Palladini

2018

Near Surface Geophysics

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A B S T R A C TA soil contaminated by dense non-aqueous phase liquids generally exhibits variation of electrical permittivity and resistivity over time. In this paper, we relate photo images with results of electrical resistivity tomography, induced polarization tomography, and ground-penetrating radar survey in a laboratory-controlled test, where a cell, filled with grained-glass beads contaminated with HFE-7100 (hydrofluoroether) and under saturated conditions, was used. The aim was to find robust links between geophysical and physico-chemical parameters of a contaminated soil in order to reduce the ambiguities in data interpretation. The monitoring, conducted over 100 days, shows that each geophysical method may or may not be sensitive to the multiple phases of hydrofluoroether (pure, dissolved and gaseous phases) depending on the contaminant (chemical composition, fresh, mature, etc.) and on the host enviroment. We propose some empirical relationships that allow us to quantitatively monitor the water saturation variation induced by hydrofluoroether.The photo images confirm that the pure phase of hydrofluoroether changes over time, which is probably due to biological or/and chemical variation of the contaminant. Electrical resistivity tomography results appear to be sensitive to the vast amount of pure phase of the hydrofluoroether. Induced polarization, measured in the extremely low frequency range (<25 Hz), allows detecting the pure phase of the contaminant, probably due to the decrease of water permeability and chemical degradation of the compound over time. The ground-penetrating radar and time domain reflectometry methods based on measurements in very-high frequency and ultra-high frequency ranges are mainly sensitive to the water content and, as a consequence, to the replacement of water by pure and gaseous phases of hydrofluoroether.

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Electrical permittivity and resistivity time lapses of multiphase DNAPLs in a lab test

Cited by 20 publications

References 29 publications

Organic contaminant transport and fate in the subsurface: Evolution of knowledge and understanding

Organic contaminant transport and fate in the subsurface: Evolution of knowledge and understanding

Complex resistivity characteristics of saltwater-intruded sand contaminated by heavy metal

Time‐lapse laboratory tests to monitor multiple phases of DNAPL in a porous medium

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