Magnetic resonance imaging of nonaqueous phase liquid during soil vapor extraction in heterogeneous porous media

Chu, Yanjie; Werth, Charles J.; Valocchi, Albert J.; Yoon, Hongkyu; Webb, Andrew

doi:10.1016/j.jconhyd.2003.12.003

Cited by 26 publications

(17 citation statements)

References 29 publications

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“…MRI is unique because it is non-destructive, allowing three-dimensional images to be taken of the phases as a function of space and time. Our results are described in detail in Chu et al (2004); to our knowledge, our work is the first time MRI has been used to observe both water and NAPL in unsaturated media. Analysis of the MRI data focused on four column experiments.…”

Section: B Magnetic Resonance Imaging Experiments On Svementioning

confidence: 93%

See 1 more Smart Citation

Final Technical Report EMSP 70045 Investigation of Pore Scale Processes That Affect Soil Vapor Extraction

Valocchi¹,

Werth²,

Webb³

2004

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Section: B Magnetic Resonance Imaging Experiments On Svementioning

confidence: 93%

“…A more detailed discussion of the imaging results presented here is in our publication (Chu et al, 2004).…”

Section: B Magnetic Resonance Imaging Experiments On Svementioning

confidence: 99%

Final Technical Report EMSP 70045 Investigation of Pore Scale Processes That Affect Soil Vapor Extraction

Valocchi¹,

Werth²,

Webb³

2004

Self Cite

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“…휘발성오염물질로 오염된 지역의 정화에 효과인 방법으로 알려져 있다 (Johnston et al, 2002;Kaleris andCroise, 1997, 2002;Chu et al, 2004 (McCray and Falta, 1995;Benner et al, 2002;Nobre and Nobre, 2004;Tsai, 2007). …”

Section: 서 론 토양증기추출법은 지중토양에 압력구배를 형성하여 토 양표면의 휘발성 오염물질을 휘발·추출하는 방법으로써unclassified

Calculation of Radius of Influence and Evaluation of Applicability of Air Sparging/Soil Vapor Extraction system for the Remediation of Petroleum Contaminated Rail Site

Cho¹,

Park²,

Kim

et al. 2015

Journal of Soil and Groundwater Environment

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The objectives of this study were to calculate the radius of influence (ROI) of well for an air-sparging (AS)/soil vapor extraction (SVE) system and to evaluate the applicability of the system applied for the remediation of the petroleum contaminated rail site. For air permeability test, three monitoring wells were installed at a location of 1.3 m, 2.3 m, 3.0 m from the extraction well. And the pressure of each monitoring well was measured by extracting air from the extraction well with the pressure and flow of (−)2,600 mmH 2 O and 1.58 m 3 /min. The ROI for an extraction well was calculated as 4.31 m. Air was injected into the injection well with the pressure and flow of 3,500 mmH 2 O and 0.6 m 3 /min to estimate the radius of influence for oxygen transfer. Oxygen concentrations of air from three monitoring wells were measured. The ROI of an injection well for oxygen transfer was calculated as 3.46 m. The 28 extraction wells and 19 injection wells were installed according to the ROI calculated. The AS/SVE system was operated eight hours a day for five months. The rail site was contaminated with the petroleum and concentrations of benzene, toluene, and xylene were over the 'Worrisome Standard' of the 'Soil Environment Conservation Act'. The contaminated area was estimated as 732 m 2 and contaminants were dispersed up to (−)3 m from the ground. During the operation period, soil samples were collected from 5 points and analyzed periodically. With the AS/SVE system operation, concentrations of benzene, toluene, and xylene were decreased from 7.5 mg/kg to 2.0 mg/kg, from 32.0 mg/kg to 23.0 mg/kg, from 35.5 mg/kg to 23.0 mg/kg, respectively. The combined AS/SVE system applied to the rail site contaminated with volatile organic compounds (VOCs) exhibited a high applicability. But the concentration of contaminants in soil were fluctuated due to the heterogeneous of soil condition. Also the effect of the remediation mechanisms was not clearly identified.

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“…Recently, applications of NMR micro -imaging that focus on contaminant processes in porous media have emerged (Reeves and Chudek, 2001 ;Chen et al, 2002 ;Zhang et al, 2002 ;Chu et al, 2004 ). Reeves and Chudek (2001) used this technique to study diesel oil migration in sediment cores.…”

Section: Nmr Micro -Imagingmentioning

confidence: 99%

“…Similarly, Chen et al (2002) measured the oil distribution in aquifer columns and Zhang et al (2002) studied the movement of dense nonaqueous phase liquid (NAPL) in silica gel columns. Chu et al (2004) evaluated the effi ciency of NAPL removal from silica gel columns during soil vapor extraction (SVE). NMR micro -imaging techniques are benefi cial because contaminant movement or fl ow through a column can be monitored in real time and images can be acquired that depict the location of the contaminant of interest.…”

Section: Nmr Micro -Imagingmentioning

confidence: 99%

Nuclear Magnetic Resonance Analysis of Natural Organic Matter

Simpson

2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

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Magnetic resonance imaging of nonaqueous phase liquid during soil vapor extraction in heterogeneous porous media

Cited by 26 publications

References 29 publications

Final Technical Report EMSP 70045 Investigation of Pore Scale Processes That Affect Soil Vapor Extraction

Final Technical Report EMSP 70045 Investigation of Pore Scale Processes That Affect Soil Vapor Extraction

Calculation of Radius of Influence and Evaluation of Applicability of Air Sparging/Soil Vapor Extraction system for the Remediation of Petroleum Contaminated Rail Site

Nuclear Magnetic Resonance Analysis of Natural Organic Matter

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