Effect of sediment size on area of influence during groundwater remediation by air sparging: a laboratory approach

Peterson, Jonathan W.; Lepczyk, P. A.; Lake, Kimberly L.

doi:10.1007/s002540050394

Cited by 29 publications

(28 citation statements)

References 10 publications

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“…Laboratory studies have demonstrated that the macro-scale behavior of fluid flow and phase displacement processes in porous media depends on small-scale structures or heterogeneities (e.g., Glass et al 2000;Mortensen et al 2001;Conrad et al 2002;Ji et al 1993;Elder and Benson 1999;Peterson et al 1999;Reddy and Adams 2001). Out of special interest for understanding of large-scale phase displacement are quantitative analyses of the local (porescale) gas-phase dynamics.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale Optical Analyses of Dynamic Gas Saturation During Air Sparging into Glass Beads

et al. 2007

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A multi-scale optical imaging technique was developed allowing for the 2D observation of two phase flow in porous media at two different scales simultaneously: Using two coupled cameras, a 2D flow cell (0.5×0.5 m 2 ) is recorded entirely at the bench scale and at the pore scale with a spatial resolution of 0.5 and 0.01 mm, respectively. The technique is applied to study channelized gas flow in saturated glass beads. We analyze the phase distribution at the pore scale and derive a pixel-based method for the measurement of saturation at the larger scale. This method assumes linearity between the mean reflected light intensity and the local gas saturation if averaging is performed over representative areas (REV). The REV depends on the irregularity of the local pore structure and has a lower limit at the correlation length of the porous medium (somewhat above the size of the glass beads) and an upper limit which correlates with the width of gas channels. These limits could be quantified through optical analysis. The optical approach to estimate phase saturations was validated by gravimetric analysis where a characteristic ratio between the optically observed flow cell wall and the saturation within the bulk material was identified, which corresponds to the expectation based on geometrical considerations of the glass bead packing. Considering a transient flow experiment the optical method is demonstrated to be able to quantify the temporal evolution of the residual and the convective gas phase. We conclude that the new technique provides a valuable tool to improve our quantitative understanding of multiphase phenomena across different scales.

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Section: Introductionmentioning

confidence: 99%

Multi-scale Optical Analyses of Dynamic Gas Saturation During Air Sparging into Glass Beads

et al. 2007

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“…Of crucial importance is the flow type in the air sparged zone, which can be channel-type, pervasive (bubbly), or chamber-type (with amoeba-and tabular-form air invaded pockets) (Ji et al 1993;Peterson 1999Peterson , 2001Chao et al 2008). The final output of AS-SVE is determined by the drop in concentrations of chemicals to be removed from groundwater-vadose zone.…”

Section: Introductionmentioning

confidence: 99%

Fluids’ dynamics in transient air sparging of a heterogeneous unconfined aquifer

et al. 2010

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Water table dynamics, dissolved oxygen (DO) content, electrical resistivity (ER) in monitoring wells and air pressure in the vadose zone are monitored in air sparging (AS) accompanied by soil vapor extraction (SVE) at a hydrocarbon-contaminated groundwater site in Oman, where a diesel spillover affected a heterogeneous unconfined aquifer. The formation of a groundwater mound at the early stage of air injection and potential lateral migration of contaminants from the mound apex called for an additional hydrodynamic barrier constructed as a pair of pump-andtreat (P&T) wells whose recirculation zone encompassed the AS and SVE wells. In all monitored piezometers the phreatic surface showed a rapid and distinct peak, which is attributed to the time of air breakthrough from the injection point to the vadose zone and a relatively mild recession limb interpreted as a decay of the mound. Tracer tests showed a layer of a relatively low hydraulic conductivity at an intermediate depth of the screened interval of the wells. Increased levels of DO and borehole air pressure that have been observed (as far as 50 m away) are likely mitigated by SVE and P&T. Radius of influence can be indirectly inferred from ER and DO changes in the AS operation zone. Salt tracer tests have shown that groundwater velocity within the AS zone decreases with the increase of air injection rate.

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“…(Percy, 2008;Lee et al, 2007). Photo surface and pit-subsurface oiling conditions in the Gurumpo beach area, Taean-gun, Chungcheongnam-do, western coast of Korea (Lee and Park, 2007 (Adams, 2011;Peterson et al, 2001;Peterson et al, 2000;Peterson et al, 1999;Reddy and Adams, 1996;Lundegard and Labrecque, 1995 (Albergaria, 2012;Meegoda and Hu, 2011;Peterson et al, 1999). Table 2).…”

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confidence: 99%

“…(Mcmanus, 1988;Folk, 1968;Krumbein, 1934;Wentworth, 1922). (Peterson, 1999) Folk, sediment by Folk (1968); S, Sand; sZ, sandy Silt; Z, Silt; and C, Clay. c) kPa, shear strength using fall cone apparatus (Mandol, 60 g; Hajeon, Sangam and Busan, 10 g).…”

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confidence: 99%

Degradation of TPHs, TCE, PCE, and BTEX Compounds for NAPLs Contaminated Marine Sediments Using In-Situ Air Sparging Combined with Vapor Extraction

Lee¹,

Han²,

Park³

2013

Economic and Environmental Geology

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This study was carried out in order to determine the remediation of total petroleum hydrocarbons (TPHs), trichloroethylene (TCE), perchloroethylene (PCE), benzene, toluene, ethylbenzene and xylenes (BTEX) compounds for non-aqueous phase liquids (NAPLs) using in-situ air sparging (IAS) / vapor extraction (VE) with the marine sediments of Mandol, Hajeon, Sangam and Busan, South Korea. Surface sediment of Mandol area had sand characteristics (average particle size, 1.789 Φ), and sandy silt characteristics (average particle size, 5.503 Φ), respectively. Sangam surface sediment had silt characteristics (average particle size, 5.835 Φ). Sediment characteristics before experiment in the Busan area showed clay characteristics (average particle size, 8.528 Φ). TPHs level in the B1 column of Mandol, Hajeon, Sangam, and Busan sediments were 2,459, 6,712, 4,348, and 14,279 ppm. B2 (3 L/ min) to B5 (5 L/min) columns reduced 99.5% to 100.0% of TCE and 93.2% to 100.0% of PCE. Removal rates of TCE, PCE, and BTEX are closely correlated (0.90-0.99) with particle sizes and organic carbon concentrations. However, TPHs (0.76) and benzene (0.71) showed the poorer but moderate correlations with the same parameters.Key words : in-situ air sparging, non-aqueous phase liquids, remediation, particle size, vapor extraction 이 연구는 공기주입법(in-situ air sparging; IAS)이 결합된 증기추출법(vapor extraction; VE)을 이용한 실내 실험 연구로 비수용성액체 유기물(non-aqueous phase liquids; NAPLs)의 총유류계탄화수소(total petroleum hydrocarbons; TPHs), 트리클로에틸렌(trichloroethylene; TCE), 퍼클로로에틸렌(perchloroethylene; PCE), 벤젠(benzene), 톨루엔

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Effect of sediment size on area of influence during groundwater remediation by air sparging: a laboratory approach

Cited by 29 publications

References 10 publications

Multi-scale Optical Analyses of Dynamic Gas Saturation During Air Sparging into Glass Beads

Multi-scale Optical Analyses of Dynamic Gas Saturation During Air Sparging into Glass Beads

Fluids’ dynamics in transient air sparging of a heterogeneous unconfined aquifer

Degradation of TPHs, TCE, PCE, and BTEX Compounds for NAPLs Contaminated Marine Sediments Using In-Situ Air Sparging Combined with Vapor Extraction

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