Soil Clean-Up by Surfactant Washing. IV. Modification and Testing of Mathematical Models

Megehee, M. Maria; Clarke, Ann N.; Oma, K.H.; Wilson, David J.

doi:10.1080/01496399308017494

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…In an effort to directly address the source of the contamination, researchers have been investigating the addition of agents to enhance the solubility of contaminants (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). One such system which recently reached the field demonstration stage is surfactant enhanced aquifer remediation (SEAR).…”

Section: Introductionmentioning

confidence: 99%

Henry's Law Constants and Micellar Partitioning of Volatile Organic Compounds in Surfactant Solutions

Vane

Giroux

1999

J. Chem. Eng. Data

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Partitioning of volatile organic compounds (VOCs) into surfactant micelles affects the apparent vapor−liquid equilibrium of VOCs in surfactant solutions. This partitioning will complicate removal of VOCs from surfactant solutions by standard separation processes. Headspace experiments were performed to quantify the effect of four anionic surfactants and one nonionic surfactant on the Henry's law constants of 1,1,1-trichloroethane, trichloroethylene, toluene, and tetrachloroethylene at temperatures ranging from 30 to 60 °C. Although the Henry's law constant increased markedly with temperature for all solutions, the amount of VOC in micelles relative to that in the extramicellar region was comparatively insensitive to temperature. The effect of adding sodium chloride and isopropyl alcohol as cosolutes also was evaluated. Significant partitioning of VOCs into micelles was observed, with the micellar partitioning coefficient (tendency to partition from water into micelle) increasing according to the following series: trichloroethane < trichloroethylene < toluene < tetrachloroethylene. The addition of surfactant was capable of reversing the normal sequence observed in Henry's law constants for these four VOCs.

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Section: Introductionmentioning

confidence: 99%

Henry's Law Constants and Micellar Partitioning of Volatile Organic Compounds in Surfactant Solutions

Vane

Giroux

1999

J. Chem. Eng. Data

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“…Over the last few years, attention has been focused on increasing the solubility of the contaminants with the addition of surfactants, leading to some studies involving laboratory and field experiments of above-ground and insitu soil washing (3). Some studies have been conducted to evaluate and design surfactant-enhanced remediation schemes (4,5). Significant solubilization occurs above the CMC of the surfactant, and most of the very low-solubility contaminants are solubilized in the surfactant micelles.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation Kinetics of Phenanthrene Partitioned into the Micellar Phase of Nonionic Surfactants

Guha

Jaffé

1996

Environ. Sci. Technol.

207

153

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Surfactants above their critical micelle concentration can solubilize hydrophobic contaminants into their micelles. This process enhances the apparent solubility of contaminants such as hydrocarbons and, therefore, also their desorption from soils. Conceivably, in the absence of any inhibitory effects, such surfactants may enhance the biodegradation of the hydrocarbon. Through a set of screening experiments, a series of nonionic surfactants were identified that do not inhibit the biodegradation of phenanthrene. A mathematical model was formulated to describe the interaction of the biomass−contaminant−water−surfactant system. Assumptions that the model formulation is based on are that the phenanthrene in solution, partitioned into the micellar phase and sorbed onto the biomass and other solid surfaces,is at equilibrium and that these equilibria can be described by simple partition coefficients. It was also assumed that the presence of the surfactant does not affect the biochemical characteristics of the biomass. An effective bioavailable micellar-phase concentration of phenanthrene was defined. The model simulates experimental data well, indicating that a fraction of the micellar-phase phenanthrene is directly bioavailable. For three of the surfactants tested (Triton N101, Triton X100, and Brij 30), the micellar-phase bioavailable fraction of phenanthrene decreased with an increasing surfactant concentration. For Brij 35, it was found that the fraction of the phenanthrene associated with the micellar phase was not directly bioavailable.

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“…They further showed that the effectiveness of recycled SDS solution was as good as that of virgin solution in removing the biphenyl. Megehee et al (1993) verified the modified mathematical models for operation of surfactant washing/flushing column or test beds. Model simulations appeared to yield good agreement with the experimental data.…”

Section: Chemical and Physical Treatmentmentioning

confidence: 79%

Hazardous waste treatment technologies

Kim¹,

Gee²

1994

Water Environment Research

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Soil Clean-Up by Surfactant Washing. IV. Modification and Testing of Mathematical Models

Cited by 6 publications

References 3 publications

Henry's Law Constants and Micellar Partitioning of Volatile Organic Compounds in Surfactant Solutions

Henry's Law Constants and Micellar Partitioning of Volatile Organic Compounds in Surfactant Solutions

Biodegradation Kinetics of Phenanthrene Partitioned into the Micellar Phase of Nonionic Surfactants

Hazardous waste treatment technologies

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