Propagation of a nonionic surfactant in radial sandstone cores

Kwok, W.; Hayes, Robert E.; Nasr‐El‐Din, Hisham A.

doi:10.1002/cjce.5450730514

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…The composition of the mobile phase at full breakthrough in column studies is different from the final composition in batch adsorption studies. The lower degree of surfactant adsorption in column experiments may also be attributed to the presence of shear stress during continuous flow conditions (1). Shear stress might counteract formation of surface aggregates and thereby reduce adsorption.…”

Section: Resultsmentioning

confidence: 99%

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Adsorption of a Multicomponent Rhamnolipid Surfactant to Soil

Noordman¹,

Brusseau

Janssen³

2000

Environ. Sci. Technol.

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The adsorption of rhamnolipid, a multicomponent biosurfactant with potential application in soil remediation, to two sandy soils was investigated using batch and column studies. The surfactant mixture contained six anionic components differing in lipid chain length and number of rhamnose moieties. Batch adsorption experiments indicated that the overall adsorption isotherms of total surfactant and of the individual components leveled off above a concentration at which micelles were formed. Column experiments showed that the retardation factors for the total surfactant and for the individual components decreased with increasing influent concentration. Extended tailing was observed in the distal portion of the surfactant breakthrough curve. The concentration-dependent retardation factors and the extended tailing are in accordance with the nonlinear (concave) adsorption isotherms found in the batch adsorption studies. The more hydrophobic rhamnolipid components were preferentially adsorbed, but adsorption was not correlated with the organic carbon content of the soil. This suggests that adsorption of rhamnolipid to soil is not a partitioning process but mainly an interfacial adsorption process.

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Section: Resultsmentioning

confidence: 99%

“…The understanding of surfactant adsorption is of importance for the application of surfactants for enhanced oil recovery ( , ) and for surfactant-enhanced soil remediation ( − ). Adsorption of surfactants is detrimental for these applications as it results in surfactant loss and reduced surfactant mobility.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of a Multicomponent Rhamnolipid Surfactant to Soil

Noordman¹,

Brusseau

Janssen³

2000

Environ. Sci. Technol.

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“…The initial condition with C HOC ( x ,0) = C surf ( x ,0) = 10 -10 g/L was used to approximate an uncontaminated column. It is assumed that dispersion of the conservative tracer, phenanthrene, and rhamnolipid can be described using the same Peclet number (i.e., mechanical mixing controls dispersion) ( , ).…”

Section: Model Developmentmentioning

confidence: 99%

Effects of Rhamnolipid Biosurfactants on Removal of Phenanthrene from Soil

Noordman

Brusseau

et al. 1998

Environ. Sci. Technol.

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Solubilizing agents may enhance remediation of soils contaminated with hydrophobic organic contaminants by diminishing sorption of the contaminants or increasing desorption rates. The effectiveness of rhamnolipid biosurfactants to enhance the removal of sorbed contaminants from soil was determined using column studies. Soil columns were contaminated with phenanthrene and subsequently eluted with electrolyte solution or with electrolyte solution containing 500 mg/L rhamnolipid. For the four soils studied, removal of 50% of the phenanthrene from the soil columns was accomplished in a 2-5-fold shorter time period, and the time required for 90% removal was reduced up to 3.5-fold when elution was performed with the rhamnolipid-containing solution as compared to the treatment without rhamnolipid. The effect of rhamnolipid on the removal of phenanthrene was satisfactorily simulated using independently obtained parameters with a two-component advective-dispersive model accounting for micellar solubilization and admicellar sorption. A more detailed analysis of the system showed that desorption rates of phenanthrene in the presence of 500 mg/L rhamnolipid were higher than predicted on the basis of desorption rate constants of phenanthrene determined in the absence of rhamnolipid. It is concluded that rhamnolipid enhanced the removal of phenanthrene mainly by micellar solubilization and also by influencing sorption kinetics.

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Influence of Alcohol Cosurfactants on Surfactant-Enhanced Flushing of Diesel-Contaminated Soil

Kim

Lee

2002

Journal of Environmental Science and Health, Part A

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The effects of medium-chain alcohols on the surfactant-enhanced diesel removal from contaminated sandy soil were investigated. The mixture of Tween 80, which has a double bond in its hydrophobic structure, and hexanol showed the best performance of diesel removal among the combinations of surfactants (Tween 20, Tween 60, and Tween 80) and alcohols (n-butanol, n-pentanol, and n-hexanol) used in this study. The efficiency of diesel flushing increased as the alkyl-chain length of the alcohol and the alcohol fraction in the flushing solution increased. Meanwhile, the removal rate was reduced when the surfactant concentration was too high most likely due to the surfactant aggregation or emulsion formation. A pulsed pumping of flushing solution was not beneficial for improving the removal rate under the experimental conditions described in this study.

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Propagation of a nonionic surfactant in radial sandstone cores

Cited by 4 publications

References 28 publications

Adsorption of a Multicomponent Rhamnolipid Surfactant to Soil

Adsorption of a Multicomponent Rhamnolipid Surfactant to Soil

Effects of Rhamnolipid Biosurfactants on Removal of Phenanthrene from Soil

Influence of Alcohol Cosurfactants on Surfactant-Enhanced Flushing of Diesel-Contaminated Soil

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