Modeling Mass Removal during In Situ Air Sparging

Elder, Carl R.; Benson, Craig H.; Eykholt, Gerald R.

doi:10.1061/(asce)1090-0241(1999)125:11(947)

Cited by 15 publications

(12 citation statements)

References 30 publications

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“…Air-sparging models available in the literature [1][2][3][18][19][20][21] to predict mass removal from groundwater are helpful for this study to construct the gaseous substrates (or, toluene-vapor) dissolution model. Even though there are similarities in mass transfer equations, there are also significant differences between the air-sparging model and dissolution model.…”

Section: Model Developmentmentioning

confidence: 99%

“…Even though there are similarities in mass transfer equations, there are also significant differences between the air-sparging model and dissolution model. This paper presents a simple mathematical model to predict the dissolution process of gaseous substrates applying the air-channel concept [3,18,21].…”

Section: Model Developmentmentioning

confidence: 99%

“…The representative air channel has an air saturation, porosity, diameter, length, and spacing equals to the average properties of the entire air plume. Our model further assumed the representative air channel passing through 1/4(R i ) as recommended in the modeling of in situ air sparging [18,21]. The validity of simplified assumptions would be further checked by verifying model predictions with toluene-vapor dissolution tests.…”

Section: Conceptual Modelmentioning

confidence: 99%

“…Elder et al [18] developed an air-sparging model using the airchannel concept. There are similarities in mass transfer equations between air sparging and our dissolution processes.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A model and experimental study for dissolution efficiency of gaseous substrates through in situ sparging

Liang

Kuo

2009

Journal of Hazardous Materials

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Section: Model Developmentmentioning

confidence: 99%

Section: Model Developmentmentioning

confidence: 99%

Section: Conceptual Modelmentioning

confidence: 99%

“…Elder et al [18] developed an air-sparging model using the airchannel concept. There are similarities in mass transfer equations between air sparging and our dissolution processes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A model and experimental study for dissolution efficiency of gaseous substrates through in situ sparging

Liang

Kuo

2009

Journal of Hazardous Materials

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“…In these models hydrodynamics and mass transport within each phase is simulated. However, both models assume instantaneous equilibrium between liquid and gas phase (Henry's law) which is shown to give significantly "optimistic" results considering required time of remediation 12), 13) . Rabideau et al (1999) proposed a "reactor" model which takes into account diffusion towards the air channels.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Contaminant Numerical Simulation of Contaminant

Jaćimović

Hosoda

Kishida

et al. 2007

PROCEEDINGS OF HYDRAULIC ENGINEERING

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The paper presents a mechanistic model for simulation of mass removal during air sparging. Model takes into account several processes which are commonly neglected, such as air channeling and advection by the water phase. Diffusion of contaminants towards the air channels is modeled as a first order kinetic between the two water compartments. The adopted model of contaminant evaporation at the air-water interface is verified by comparison with reported experimental results. Model is used for simulation of two-dimensional air sparging laboratory experiment conducted by Reddy and Tekola (2004). Good overall agreement is observed. It is showed that natural groundwater flow can influence the efficiency of the air sparging.

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Effect of system variables and particle size on physical characteristics of air sparging plumes

Baker¹,

Benson

2007

Geotech Geol Eng

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Air was injected through a well in a thin transparent tank filled with saturated glass beads to study how the size and air saturation of air sparging plumes are affected by particle size and gradation; operational parameters such as injection pressure, well depth, injection pressure pulsing; and well outlet configuration. V-shaped air plumes with an apex between 408 and 608 were obtained for all tests. The air pressure required to initiate sparging agreed closely with the sum of the air entry pressure and the hydrostatic pressure, with higher initiation pressures required in the fine and wellgraded beads. Higher air flow rates and air saturations were obtained in coarser beads at a given pressure, and the variation in flow rate was consistent with estimated air permeabilities. Peak average air saturations were 28-56% for the coarsemedium beads, 10% for the well-graded beads, and 8% for the fine beads. Air saturation and the radius of influence increased modestly (<40%) as the normalized injection pressure exceeded 0.1. Radius of influence increased by approximately a factor of two as the well depth increased, but leveled off once the ratio of radius of influence to well depth reached 0.60-1.05. Pulsing of injection pressure had no effect on the initiation pressure, air flow rate, or air saturation, but increased the size of the air plume and the radius of influence slightly (<15%). Well outlet configuration had only a slight affect the radius of influence (<10%), air saturation (<10%), or air flow rate (<12%). Dye testing showed that water surrounding the air plume circulated during continuous and pulsed sparging. However, pulsed sparging resulted in greater and more defined circulation of water within and adjacent to the air plume, which should reduce mass transfer limitations during sparging.

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Modeling Mass Removal during In Situ Air Sparging

Cited by 15 publications

References 30 publications

A model and experimental study for dissolution efficiency of gaseous substrates through in situ sparging

A model and experimental study for dissolution efficiency of gaseous substrates through in situ sparging

Numerical Simulation of Contaminant Numerical Simulation of Contaminant

Effect of system variables and particle size on physical characteristics of air sparging plumes

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