Nonconvective movement of VOCs in moist soil

Cabbar, H. Canan; McCoy, Benjamin J.

doi:10.1002/ep.670150314

Cited by 5 publications

(10 citation statements)

References 23 publications

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“…Later, it was shown that the single-pellet moment technique could be successfully used to evaluate tortuosity factors (Wang and Smith, 19831, reaction rate parameters, and permeability of porous solids (Dogu et al, 1986(Dogu et al, , 1989. More recently, the technique was adopted for characterization of VOC sorption and diffusion in dry soil (Cabbar et al, 1994(Cabbar et al, , 1996. To determine the effect of soil organic matter on VOC sorption, Cabbar et al (1996) determined the dynamic behavior of dichloromethane for several humic acid loadings on a single pellet of natural clay.…”

Section: Methodsmentioning

confidence: 99%

“…More recently, the technique was adopted for characterization of VOC sorption and diffusion in dry soil (Cabbar et al, 1994(Cabbar et al, , 1996. To determine the effect of soil organic matter on VOC sorption, Cabbar et al (1996) determined the dynamic behavior of dichloromethane for several humic acid loadings on a single pellet of natural clay.…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies (Rogers et al, 1980;Garbarini and Lion, 1986;Chiou and Shoup, 1985) focused on VOC adsorption in dry soils. Cabbar et al (1994Cabbar et al ( , 1996 applied the single-pellet moment method to determine diffusion and adsorption parameters for chlorinated ethanes on dry soil, and also the effect of SOM on dichloromethane sorption in a dry simulated soil.…”

Section: Introductionmentioning

confidence: 99%

“…Thibaud et al (1993) investigated the effect of moisture on the sorption-desorption of chlorobenzene and toluene using a dynamic technique based on frontal analysis chromatography. Cabbar and McCoy (1996), applying a model similar to McCoy and Rolston (19921, developed an expression for the retardation factor that accounts for the effects of water layers partially covering organic and mineral surfaces. Batterman et al (1995) found retardation and dispersion coefficients for hydrocarbon vapors using transient methods in unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

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Sorption and diffusion of chlorinated methanes in moist clay

1998

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The dynamic behavior of chlorinated methanes in clays exposed to relative humidities (RH) from 0 to 80% was investigated with the single-pellet pulse-response moment technique. Values of effective difision coeficients obtained from zeroth moment analysis differed only slightly for dry and moist clay pellets. When the clay pellet was dry, equilibrium adsorption constants of dichloromethane (D), trichloromethane (TI, and carbon tetrachloride (C) at the gas-mineral interface were determined from first moments to be 118, 92, and 90, respectively. Dryness factors (dry fraction of surface area) for clays with RH of 5, 20, 40, and 60% were also calculated from first moments as 0.5, 0.1, 0.04, and 0.01, respectively. When the pGre surfaces were covered with the water film (dryness factor was 0 for the pellet at RH SO%), overall equilibrium adsolption constants for the same tracers (0, T, C ) at the gas-water and water-mineral interfaces were determined to be 75, 7.2, and 3.6, respectively.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sorption and diffusion of chlorinated methanes in moist clay

1998

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“…This trend has been observed for very different systems, such as noble gases and VOCs in concrete and soil [23][24][25][26], and NaCl in meat [27]. For volatile chemicals, this effect has been explained by filling the pores with a liquid phase thus affecting the gas phase diffusional resistance.…”

Section: Water Contents Of Concrete Samples In Shaking Flasks and Ovementioning

confidence: 95%

Bioremediation of Concrete Contaminated with n‐Hexadecane and Naphthalene

Beklemishev

Kozliak

2003

Acta Biotechnologica

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Retention/leaching and bioremediation of n-hexadecane and naphthalene absorbed in building grade concrete were investigated. Retention studies showed that up to 20 mg of n-hexadecane were irreversibly absorbed per 1 g of concrete (not leached out by either water or aqueous solutions of surfactants). Bioremediation studies were conducted using three naturally occurring bacterial strains including Pseudomonas aeruginosa PG201 and soil microorganisms. Incubation of contaminated concrete pieces with bacterial suspension in shaking flasks resulted in the biodegradation/biotransformation of 8-19% of n-hexadecane or 28-35% of naphthalene, whereas neat hydrocarbons were completely degraded. Naphthalene removal was similar with and without bacteria, and only the destination of the labelled carbon was different. Direct application of biomass on contaminated concrete ("overlay procedure") proved to be more efficient. Up to 70-80% of n-hexadecane and 20-55% of naphthalene (up to 80% combined with evaporation) were removed when using agar plates or filter paper with biomass. Overlay protocols using large amounts of water proved to be more efficient for the biological removal of naphthalene but detrimental for the removal of n-hexadecane. The latter was greater with low amounts of water. Evidence obtained shows that the hydrocarbon diffusion within the pores of concrete is the rate-limiting step for bioremediation.

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