Surfactant‐enhanced remediation of DNAPL zones in granular aquifer systems

Jackson, Richard E.

doi:10.1002/rem.3440040106

Cited by 8 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…16 Micellar solubilization of this type leads to a Winsor type I, oil-in-water emulsion. 14,17,18 Thus, the solubility of NAPL increases largely when the surfactant concentration is well above the critical micelle concentration (CMC). 19 Although the exact mechanism of solubilization has not been completely elucidated, several models have been proposed, a few of which are described in detail by Zhong et al 20 Previous studies have been carried out to quantify the amount of contaminant solubilized by micellar solutions of nonionic surfactants.…”

Section: Introductionmentioning

confidence: 99%

Molecular simulations of NAPL removal from mineral surfaces using microemulsions and surfactants

Lowry

Sedghi

Goual

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Remediation of petroleum contaminants from aquifers is an ongoing and environmentally relevant challenge. Non-aqueous phase liquids (NAPLs) can infiltrate groundwater reservoirs and pollute the water source leading to health and public safety concerns. NAPLs such as asphaltenes and naphthenic acids possess high adsorptive potential making removal difficult with conventional pump-and-treat techniques. As a result, surfactants and microemulsions have been posited as a means of mobilizing and solubilizing these heavy contaminants for safe and effective removal. Experiments have shown that microemulsions with nonionic surfactants are effective for removing aquifer contaminants, although the exact molecular level mechanism is not clear. To this aim, molecular dynamics simulations were carried out with water, surfactant, and microemulsion solutions. These simulations were compared to determine the effects of surfactants and microemulsions on contaminant removal from calcite mineral surfaces. Results indicate that polar molecules serve as a base layer upon which further non-polar molecules could adsorb. Microemulsions were effective at swelling the oil phase and reducing the overall percentage of polar components, leading to easier removal. In addition, the dissociation of microemulsion micelles at the contaminant-water interface was shown to be a thermodynamically favorable process.

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular simulations of NAPL removal from mineral surfaces using microemulsions and surfactants

Lowry

Sedghi

Goual

2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

show abstract

“…At aqueous concentrations above critical micelle concentration (cmc), surfactants can increase the apparent water solubility of organic pollutants (13,14). When residual concentrations of non-aqueous-phase liquids (NAPLs) are present in a porous medium, this solubility-enhancing effect can increase the rate of NAPL dissolution (1,8,9). For pollutants sorbed to soil, the solubility-enhancing effect of surfactants can increase the rate of pollutant desorption from soil to water (1-3, 5, 6, 15-19).…”

Section: Introductionmentioning

confidence: 99%

“…Research over the past 10 yr has shown that the use of surface-active agents (surfactants) has the potential to increase the rate of remediation of ground water contaminated with relatively nonpolar organic pollutants ( − ). At aqueous concentrations above critical micelle concentration (cmc), surfactants can increase the apparent water solubility of organic pollutants ( , ).…”

Section: Introductionmentioning

confidence: 99%

Surfactant-Enhanced Remediation of a Trichloroethene-Contaminated Aquifer. 1. Transport of Triton X-100

Smith

Sahoo

McLellan

et al. 1997

Environ. Sci. Technol.

View full text Add to dashboard Cite

Transport of a nonionic surfactant (Triton X-100) at aqueous concentrations less than 400 mg/L through a trichloroethene-contaminated sand-and-gravel aquifer at Picatinny Arsenal, NJ, has been studied through a series of laboratory and field experiments. In the laboratory, batch and column experiments were conducted to quantify the rate and amount of Triton X-100 sorption to the aquifer sediments. In the field, a 400 mg/L aqueous Triton X-100 solution was injected into the aquifer at a rate of 26.5 L/min for a 35-d period. The transport of Triton X-100 was monitored by sampling and analysis of groundwater at six locations surrounding the injection well. Equilibrium batch sorption experiments showed that Triton X-100 sorbs strongly and nonlinearly to the field soil with the sharpest inflection point of the isotherm occurring at an equilibrium aqueous Triton X-100 concentration close to critical micelle concentration. Batch, soil column, and field experimental data were analyzed with zero-, one-, and two-dimensional (respectively) transient solute transport models with either equilibrium or rate-limited sorption. These analyses reveal that Triton X-100 sorption to the aquifer solids is slow relative to advective and dispersive transport and that an equilibrium sorption model cannot simulate accurately the observed soil column and field data. Comparison of kinetic sorption parameters from batch, column, and field transport data indicate that both physical heterogeneities and Triton X-100 mass transfer between water and soil contribute to the kinetic transport effects.

show abstract

Surfactant‐enhanced remediation of DNAPL zones in granular aquifer systems

Jackson

1993

Remediation Journal

Self Cite

View full text Add to dashboard Cite

mediation (SEAR).Because of the pioneering work of Schwille (1988) in Germany, chlorinated solvents are now recognized by hydrogeologists as dense, nonaqueous phase liquids (DNAPLs), which are believed to play a major role in the failure of pump-and-treat remediation systems to attain healthbased limits of decontamination within short periods of operation (EPA, 1992a;Mackay and Cherry, 1989). It is most probable that groundwater contamination by chlorinated solvents, such as trichloroethene (TCE), and other DNAPLs is most frequently caused by the dissolution of undetected DNAPLs in the subsurface, which have not been identified as such in any soil or rock cores or in any groundwater sample. Johnson (1992) has noted that a dissolved-phase plume of chlorinated solvents, such as is shown in Figure 1, should be interpreted, a priori, as an indicator of an as-yetunlocated DNAPL zone in the subsurface. Johnson and Pankow (1992) have shown that tens to hundreds of liters of DNAPL may require tens to hundreds of years to be dissolved by groundwater extraction or pump-andtreat systems.The objective of this article is to review briefly the processes controlling DNAPL migration and dissolution in the subsurface and show how these principles affect the practice of surfactant-enhanced aquifer remediation.

show abstract

Surfactant‐enhanced remediation of DNAPL zones in granular aquifer systems

Cited by 8 publications

References 21 publications

Molecular simulations of NAPL removal from mineral surfaces using microemulsions and surfactants

Molecular simulations of NAPL removal from mineral surfaces using microemulsions and surfactants

Surfactant-Enhanced Remediation of a Trichloroethene-Contaminated Aquifer. 1. Transport of Triton X-100

Surfactant‐enhanced remediation of DNAPL zones in granular aquifer systems

Contact Info

Product

Resources

About