Numerical analysis of contaminant removal from fractured rock during boiling

Chen, Fei; Falta, Ronald W.; Murdoch, Lawrence C.

doi:10.1016/j.jconhyd.2012.04.004

Cited by 12 publications

(11 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The DNAPL removal can be accelerated from low permeability clay and occur when half or less pore water are recovered [28]. The SEE application shows successful application in DNAPL remediation [23,24,27]. …”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Steam-Enhanced Extraction Experiments, Simulations and Field Studies for Dense Non-Aqueous Phase Liquid Removal: A Review

Azizan

Kamaruddin

Chelliapan

2016

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract. Experiments, simulations and field studies for dense non-aqueous phase liquid (DNAPL) removal have demonstrated successful recovery through steam-enhanced extraction. Steam-enhanced extraction is an innovative technology for soil and groundwater remediation to remove as much contamination as possible. Most of researchers study the main DNAPL recovery mechanisms such as physical displacement by vaporization, evaporation and condensation, reduction in interfacial tension and DNAPL viscosity influenced by temperature. Other removal mechanism such as steam distillation and steam stripping also has been studied. The removal of DNAPL using steam-enhanced extraction shall be investigated to identify, acquire, analyze, visualize, and evaluate the effectiveness of the remediation. Several parameters can be controlled to justify the successful of the remediation. A comprehensive understanding of the subsurface environment, multiphase fluid flow and the physical processes is required to prevent remediation failure. Thus, it will avoid continuous contamination of the subsurface environment. The researcher can quantify the reduction in contamination remediation and acquire high quality data sets to validate future numerical model. Aim of this paper is to review and to summarize the existing laboratory experiment, simulations and field studies from other researchers regarding steam-enhanced extraction for dense non-aqueous phase liquid removal.

show abstract

Section: Discussionmentioning

confidence: 99%

“…Chen, et al [23] has research the removal of 1,2-DCA (1,2-Dichloroethane) from fractured geologic media of sandstone using thermal remediation. The results shows that more than 99% 1,2-DCA are successfully removed.…”

Section: Recent Research Using Steam-enhanced Extractionmentioning

confidence: 99%

Steam-Enhanced Extraction Experiments, Simulations and Field Studies for Dense Non-Aqueous Phase Liquid Removal: A Review

Azizan

Kamaruddin

Chelliapan

2016

MATEC Web of Conferences

View full text Add to dashboard Cite

show abstract

“…The code is a member of the TOUGH suite of nonisothermal multiphase flow and mass transport simulators, which have been widely used to simulate transport phenomena in the vadose zone (Šimůnek and Bradford, 2008; Finsterle et al, 2008, 2014). TMVOC is a finite‐difference simulator for three‐phase nonisothermal flow of water, soil gas, and a multicomponent mixture of volatile organic chemicals (VOCs) in multidimensional heterogeneous porous media (MDH Engineered Solutions Corporation, 2005; Pruess and Battistelli, 2002; Chen et al, 2012; Kererat et al, 2013). The basic Darcy‐scale mass balance equations solved by TMVOC can be written in the following general form:

\frac{normald}{d t} \int_{V_{n}} M^{k} normald V_{n} = true \int_{Γ_{n}} F^{k} \cdot \overset{true\to}{boldn} d {normalΓ}_{n} + \int_{V_{n}} q^{k} d V_{n}

where d V n is an arbitrary subdomain, Γ n is the surface for the subdomain, M κ is the mass component under study, F is the mass flux, q κ is the sink–source term, and

boldnormal \vec{n}

is the normal vector on the surface element.…”

Section: Model Specificationsmentioning

confidence: 99%

Gasoline Multiphase and Multicomponent Partitioning in the Vadose Zone: Dynamics and Risk Longevity

Lari

Johnston

Davis

2016

Vadose Zone Journal

View full text Add to dashboard Cite

The multiphase and multicomponent dynamics of the release of light nonaqueous-phase liquid (LNAPL) petroleum hydrocarbons into the subsurface determines the longevity of health and environmental risks. Gasoline is of particular concern, with a wide range of volatilities and solubilities. A Darcyscale, three-dimensional, multiphase and multicomponent approach simulated the effects of the release depth and duration (20-500 d) on the distribution, partitioning, and fate of gasoline components, highlighting major changes in composition and mass during the initial release period. The simulated release occurred at either the ground surface (shallow) or immediately above the water table (deep). The LNAPL mass losses were directly related to the duration of the release. As much as 20% of the initial LNAPL mass was lost from shallow releases mainly as a result of ongoing volatilization of C4-C6 alkanes in the vadose zone over the release period. This was up to 59% higher than the deep releases, mostly resulting from the greater penetration of the deep release below the water table. Over the longer term, the mole fraction of the components within the LNAPL plume from the shallow releases asymptoted to values observed for a weathered gasoline sampled from the field. The mole fraction of toluene increased from 13 to 17% and short-chain alkanes decreased from 49 to 19%. Interestingly, the particular balance of partitioning processes left the benzene mole fraction approximately constant over the time of release and for an appreciable period beyond. This has important implications for long-term risk in the vapor and water phases.

show abstract

“…After boiling away about one‐third of the pore volume of water from a contaminated sandstone core, approximately 100% recovery of 1,2‐DCA was achieved (Chen et al ). The process of contaminant mass and heat transfer in that experiment has been simulated (Chen et al ) with the TMVOC multiphase flow heat transfer code (Pruess and Battistelli ). Good agreement was obtained between the experiment and simulation, which helped establish the reliability of the code in predicting the contaminant mass transfer between matrix blocks and fractures (Chen et al ).…”

Section: Introductionmentioning

confidence: 99%

“…The process of contaminant mass and heat transfer in that experiment has been simulated (Chen et al ) with the TMVOC multiphase flow heat transfer code (Pruess and Battistelli ). Good agreement was obtained between the experiment and simulation, which helped establish the reliability of the code in predicting the contaminant mass transfer between matrix blocks and fractures (Chen et al ). The model was then scaled up to simulate a hypothetical fractured site that has the same matrix properties as the laboratory core and an idealized fracture network using the multiple interacting continua (MINC) method (Pruess and Narasimhan ; Pruess and Battistelli ).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal Remediation in 3D Field‐Scale Fractured Geologic Media

2014

Self Cite

View full text Add to dashboard Cite

Thermal methods are promising for remediating fractured geologic media contaminated with volatile organic compounds, and the success of this process depends on the coupled heat transfer, multiphase flow, and thermodynamics. This study analyzed field-scale removal of trichloroethylene (TCE) and heat transfer behavior in boiling fractured geologic media using the multiple interacting continua method. This method can resolve local gradients in the matrix and is less computationally demanding than alternative methods like discrete fracture-matrix models. A 2D axisymmetric model was used to simulate a single element of symmetry in a repeated pattern of extraction wells inside a large heated zone and evaluate effects of parameter sensitivity on contaminant recovery. The results showed that the removal of TCE increased with matrix permeability, and the removal rate was more sensitive to matrix permeability than any other parameter. Increasing fracture density promoted TCE removal, especially when the matrix permeability was low (e.g., <10(-17) m(2)). A 3D model was used to simulate an entire treatment zone and the surrounding groundwater in fractured material, with the interaction between them being considered. Boiling was initiated in the center of the upper part of the heated region and expanded toward the boundaries. This boiling process resulted in a large increase in the TCE removal rate and spread of TCE to the vadose zone and the peripheries of the heated zone. The incorporation of extraction wells helped control the contaminant from migrating to far regions. After 22 d, more than 99.3% of TCE mass was recovered in the simulation.

show abstract

Numerical analysis of contaminant removal from fractured rock during boiling

Cited by 12 publications

References 34 publications

Steam-Enhanced Extraction Experiments, Simulations and Field Studies for Dense Non-Aqueous Phase Liquid Removal: A Review

Steam-Enhanced Extraction Experiments, Simulations and Field Studies for Dense Non-Aqueous Phase Liquid Removal: A Review

Gasoline Multiphase and Multicomponent Partitioning in the Vadose Zone: Dynamics and Risk Longevity

Numerical Analysis of Thermal Remediation in 3D Field‐Scale Fractured Geologic Media

Contact Info

Product

Resources

About