Flow characteristics of DNAPLs in sand packs: Water‐influx displacement

Thakur, Sudhanshu; Schenewerk, P.A.; Wolcott, Joanne; Groves, Frank R.

doi:10.1080/10934529509376252

Cited by 3 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Little, if any, work has been conducted on the impact that such additives have on the IFTs of CHSs. On the other hand, changes in the wettability of quartz surfaces arising from the adsorption of compounds from the NAPL phase have been examined by a number of researchers (13)(14)(15). Powers and Tamblin (13) and Harrold et al (14) have demonstrated that the adsorption of amines can reduce the water wetting preference of quartz surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Powers and Tamblin (13) and Harrold et al (14) have demonstrated that the adsorption of amines can reduce the water wetting preference of quartz surfaces. Similarly Thakur et al (15) undertook a series of water-flood experiments using lab 1,1,2-trichloroethane and a complex DNAPL mixture recovered from the Petro-Processors Superfund site. The differences in flow characteristics between the two DNAPLs were attributed, in part, to mineral wettability changes (15).…”

Section: Introductionmentioning

confidence: 99%

“…Similarly Thakur et al (15) undertook a series of water-flood experiments using lab 1,1,2-trichloroethane and a complex DNAPL mixture recovered from the Petro-Processors Superfund site. The differences in flow characteristics between the two DNAPLs were attributed, in part, to mineral wettability changes (15). During the course of their experiments, they were able to demonstrate that the passage of the mixture (composed of chlorinated hydrocarbons, oils, and dissolved plastics) through the sand pack altered the chemical composition of the field DNAPL.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Changes in Interfacial Tension of Chlorinated Solvents following Flow through U.K. Soils and Shallow Aquifer Material

Harrold

Gooddy

Reid

et al. 2003

Environ. Sci. Technol.

View full text Add to dashboard Cite

The interfacial tension (IFT) that arises at the interface between water and an immiscible organic liquid is a key parameter affecting the transport and subsequent fate of the organic liquid in water-saturated porous media. In this paper, data are presented that show how contact between a range of soil types and chlorinated hydrocarbon solvent (CHS) dense nonaqueous phase liquids (DNAPLs) can affect DNAPL/water IFT values. The soils examined are indicative of U.K. soil types and shallow aquifer materials. The solvents investigated were tetrachloroethylene (PCE) and trichloroethylene (TCE). Lab grade, recovered field DNAPL and industrial waste chlorinated solvent mixtures were used. The data from batch and column experiments invariably revealed that water/DNAPL IFT values change following contact with unsaturated soils. In the majority of cases, the IFT values increase following soil exposure. However, after contact with an organic-rich soil, the IFT of the lab grade solvents decreased. The experimental evidence suggests that these reductions are linked to the removal of organic material from the soil and its subsequent incorporation into the solvent IFT increases in the case of lab solvents are shown to be linked to the removal of stabilizers (added by the manufacturers to obviate degradation) that are removed by adsorption to soil mineral surfaces. Similarly, it is conjectured that adsorption of surface-active compounds from the industrial waste samples to soil surfaces is responsible for increases in the IFT in these samples. Finally, it was observed that invading CHSs are capable of dissolving and subsequently mobilizing in-situ soil contaminants. GC/MS analysis revealed these mobilized soil contaminants to be polyaromatic hydrocarbons and phthalate esters.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Changes in Interfacial Tension of Chlorinated Solvents following Flow through U.K. Soils and Shallow Aquifer Material

Harrold

Gooddy

Reid

et al. 2003

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In studies, in which recovery efficiencies were studied under laboratory conditions using both laboratory and field materials, efficiencies between the two materials were quite different. Thakur et al (1995) investigated the use of a laboratory grade DNAPL as a substitute for a field DNAPL in determining the effectiveness of a waterflooding scenario. The authors noted that although the experimental set-up was the same for each run, the recovery of the field DNAPL exhibited significantly more variation than the laboratory results.…”

Section: Remediation Of Field Non-aqueous Phase Liquidsmentioning

confidence: 99%

“…These experiments indicate that not only does the presence of the dye decrease the IFT of the PCE in water and ethanol, it can also increase the density and viscosity of the remedial solutions, which can decrease the effectiveness of the remediation. When any chemical is added to a DNAPL to be used in experiments, including the use of dyes for visualization, it should be documented and the potential alterations to the IFT of the mixture and wettability of the porous medium should be determined.There have not been many studies on the effects of remediation techniques on field DNAPLs under laboratory conditions Thakur et al (1995). investigated the effects of using a field versus laboratory grade DNAPL on the effectiveness of waterflooding as a remediation technique.…”

mentioning

confidence: 99%

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

Roberge-Butcher¹

View full text Add to dashboard Cite

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.

show abstract

Wettability Changes in Trichloroethylene-Contaminated Sandstone

Harrold

Gooddy

Lerner

et al. 2001

Environ. Sci. Technol.

View full text Add to dashboard Cite

It is usually assumed that chlorinated solvent nonaqueous-phase liquids (NAPLs) are nonwetting with respect to water-saturated porous media. The focus of this work was to examine whether this supposition is appropriate for used trichloroethylene (TCE) samples. In this work, the term "used" indicates that the sample has been employed industrially and therefore contains solutes and breakdown products related to its previous use. The data obtained in this study indicate that exposure of initially water wet quartz slides to industrially used solvents can cause a contact angle change, measured through the aqueous phase, of 100 degrees with a maximum stable contact angle of 170 degrees (indicative of strong NAPL wetting characteristics) being recorded. The work on quartz slides was complemented by the use of sandstone cores. Wettability was measured using the Amott test. Used TCE again proved able to alter the wetting properties of sandstone to neutral wetting. The complexity of the industrially used samples precluded any realistic attempt to examine the agents causing these wetting changes. The data captured in these experiments were compared with laboratory grade TCE, and some attempts were made to synthesize known mixtures in order to replicate wetting changes. These experiments resulted in contact angle changes but did not alter the overall wettability of the quartz slides or sandstone cores. Finally the work reported here also demonstrates that increasing the duration of exposure to solvent has an important impact upon measured contact angle.

show abstract

Flow characteristics of DNAPLs in sand packs: Water‐influx displacement

Cited by 3 publications

References 5 publications

Changes in Interfacial Tension of Chlorinated Solvents following Flow through U.K. Soils and Shallow Aquifer Material

Changes in Interfacial Tension of Chlorinated Solvents following Flow through U.K. Soils and Shallow Aquifer Material

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

Wettability Changes in Trichloroethylene-Contaminated Sandstone

Contact Info

Product

Resources

About