MENU
In situ sparging of gaseous CO 2 was demonstrated through laboratory and pilot-scale testing to be an effective means to neutralize a caustic brine plume (CBP) and to reduce levels of mercury and other heavy metals in groundwater. The CBP exhibits high pH levels ranging from 10.5 to 12, densities as high as 1.06 g / mL, high dissolved silica …
عرض المزيد
Seawater intrusion into this simulated confined coastal aquifer was treated as an idealized 2D problem. Assuming air was injected into the confined aquifer through a row of closely spaced wells perpendicular to the vertical cross section, the model was used to simulate air injection into a 2D section perpendicular to the coast and to the row of …
عرض المزيد
DOI: 10.1016/j.chemosphere.2012.08.046 Corpus ID: 21516636; Hydrogeo-chemical impacts of air sparging remediation on a semi-confined aquifer: evidences from field monitoring and modeling.
عرض المزيد
Surfactant-enhanced air sparging (SEAS) is an effective method of remediating volatile organic compounds in groundwater. In this study, the airflow migration mechanism and benzene removal in a heterogeneous aquifer during air sparging (AS) and SEAS remediation were studied using a light transmission visualisation technology.
عرض المزيد
Regulation of airflow within the aquifer during air sparging can also be accomplished by augmenting viscosity of groundwater (Cho et al., 2022; Choi et al., 2018; Kim et al., 2016). Hydraulic conductivity of the aquifer is inversely proportional to the viscosity of the groundwater, thereby potentially impeding air intrusion into the saturated ...
عرض المزيد
Abstract and Figures. A field experiment was conducted at Canadian Forces Base Borden (CFB Borden) to assess the air distribution from a single in situ air sparging injection point. This aquifer ...
عرض المزيد
Air sparging (AS) is considered one of the most effective methods for the remediation of volatile organic compounds in groundwater (Bass ... Hydrogeo-chemical impacts of air sparging remediation on a semi-confined aquifer: evidences from field monitoring and modeling. Chemosphere, 90 (4) (2013), pp. 1419-1426. View PDF View …
عرض المزيد
Air sparging is generally more applicable to the lighter gasoline constituents (i.e., benzene, ethylbenzene, toluene, and xylene [BTEX]), ... sparging cannot be used to treat groundwater in a confined aquifer because the injected air would be trapped by the saturated confining
عرض المزيد
In the summer of 1993, an effort to evaluate the effectiveness of in-situ air sparging (IAS) and soil vapor extraction (SVE) to remedy jet fuel condition found in Colorado River Terrace deposits was initiated by the Air Force Center for Environmental Excellence. Preliminary field tests were performed to develop air injection flow rates, IAS …
عرض المزيد
Disadvantages. Can only be used in environments where air sparging is suitable (e.g., uniform and permeable soils, unconfined aquifer, no free-phase hydrocarbons, no nearby subsurface confined spaces). Some interactions among …
عرض المزيد
EPA. Aquifer Remediation Injection Wells for Air Sparging. The Underground Injection Control (UIC) Program, created under the authority of the Safe Drinking Water Act (SDWA), is a preventative program aimed at protecting existing and future underground sources of drinking water (USDWs). Shallow wells or disposal systems that discharge fluids ...
عرض المزيد
Hydrogeo-chemical impacts of air sparging remediation on a semi-confined aquifer: evidences from field monitoring and modeling. Chemosphere (2013) ... Air sparging (AS) is a popular technology for the in-situ remediation of groundwater contaminated by volatile organic compounds. The scope of the zone within which …
عرض المزيد
Finally, if the contaminated ground water is located within a confined aquifer system, air sparging is not the best remediation option. Once the air is injected into the ground water of the confined aquifer it would be trapped there, and not escape to the unsaturated zone, making the whole AS system essentially ineffective.
عرض المزيد
The mass removal behavior of pooled light nonaqueous phase liquid (LNAPL) by air sparging was investigated using one-dimensional and two-dimensional physical model experiments. The effects of flow ...
عرض المزيد
3.2. Air Sparging Procedure and Soil Vapor Extraction. The procedure of air sparging and soil vapor extraction (SVE) is considered one of the most common techniques used in remediating groundwater contaminated by volatile organic contaminants (VOCs). It is considered efficient, fast and relatively economical . This method involves …
عرض المزيد
The following checklist provides a summary of the development and implementation status of air sparging: ☐ At the laboratory/bench scale and shows promise. ☐ In pilot studies. ☒ At full scale. ☒ To remediate an entire site (source and plume) ☐ To remediate a source only. ☒ As part of a technology train. ☐ As the final remedy at ...
عرض المزيد
Because the air moves upward into the vadose zone, air sparging can only be used in unconfined aquifers, rather than confined aquifers. Air sparging is most effective in soils with intrinsic permeability larger than 0.1 darcy (10~ 9 cm 2) and COCs with Henry's constant greater than 100 atm and vapor pressures higher than 0.5 mm-Hg (U.S. EPA ...
عرض المزيد
Overall, AS operations at a single air sparging well drilled in a heterogeneous formation showed a significant reduction of contamination in an …
عرض المزيد
1 Introduction. Air sparging (AS) has been used as a cost-effective technique for the remediation of contaminated aquifers. Through a variety of mechanisms, …
عرض المزيد
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 …
عرض المزيد
Surfactant-enhanced air sparging (SEAS) is an effective method of remediating volatile organic compounds in groundwater. In this study, the airflow migration mechanism and benzene removal in a heterogeneous aquifer during air sparging (AS) and SEAS remediation were studied using a light transmission visualisation technology. The …
عرض المزيد
Start-Up/O&M. Objective: operate equipment, gather baseline data, adjust operating parameters to achieve desired air injection. Perform equipment checks. Initial/baseline monitoring of GW, soil gas concentrations. Start up: open bleed valve, start blower, gradually close bleed valve to get air to flow to formation.
عرض المزيد
Air sparging (AS) was explored for remediation of a petroleum contaminated semi-confined groundwater system in NE China. Physical, hydro-chemical and hydraulic behaviors in subsurface environment ...
عرض المزيد
DOI: 10.5004/dwt.2017.20156 Corpus ID: 182574421; Lab-scale experiment assessment of air sparging BTEX removal in fine grained aquifer of Shiraz Oil Refinery @article{Heidari2017LabscaleEA, title={Lab-scale experiment assessment of air sparging BTEX removal in fine grained aquifer of Shiraz Oil Refinery}, author={Hamidreza Heidari …
عرض المزيد
sparging cannot be used to treat groundwater in a confined aquifer because the injected air would be trapped by the saturated confining layer and could not escape to the …
عرض المزيد
Download Table | Air sparging test borehole details from publication: Fluids' dynamics in transient air sparging of a heterogeneous unconfined aquifer | Water table dynamics, dissolved oxygen ...
عرض المزيد
Air sparging cannot be used to treat groundwater in a confined aquifer because the injected air would be trapped by the saturated confining layer and could not escape to the unsaturated zone. The existing literature contains case histories describing both the success and failure of air sparging; however, since the technology is relatively new ...
عرض المزيد
The data indicate that air was not uniformly distributed, parabolic, or confined to vertical channels, but rather was stratified, forming flat lying pockets of high air saturation as observed from the extensive and spatially coherent reflection events. ... Air sparging in a sandy aquifer (Florence, Oregon, USA): actual and apparent radius of ...
عرض المزيد
The air sparging (AS) ... The air saturation in the aquifer with lenses of different permeabilities was calculated based on Eq. (4) and is as shown in Fig. 4 i. ... The effect of infiltration flux on air counterflow in a 2-D confined sand chamber. J. Hydrol., 571 (2019), pp. 619-626.
عرض المزيد
The application of surfactant-enhanced air sparging (SEAS) in heterogeneous aquifers has received increasing attention. In this study, a two-dimensional laboratory visualization device was used to ...
عرض المزيد
Semantic Scholar extracted view of "Effects of different permeable lenses on nitrobenzene transport during air sparging remediation in heterogeneous porous media." ... Hydrogeo-chemical impacts of air sparging remediation on a semi-confined aquifer: evidences from field monitoring and modeling. W. Fan Y. Yang Y. Lu X. Du G. X. Zhang ...
عرض المزيد
A field experiment was conducted at Canadian Forces Base Borden (CFB Borden) to assess the air distribution from a single in situ air sparging injection point. This aquifer consists of fine to ...
عرض المزيد
Hydrogeo-chemical impacts of air sparging remediation on a semi-confined aquifer: evidences from field monitoring and modeling.
عرض المزيد
Let us consider a steady state flow regime in a homogeneous and isotropic confined aquifer, ... Air sparging (AS), also known as in situ volatilization or in situ air stripping, is a remedial technology that extends to the saturated zone the possibilities and potential of soil vapor extraction (SVE), used in the unsaturated zone. In fact, AS is ...
عرض المزيد
DOI: 10.1016/S0169-7722(02)00077-3 Corpus ID: 45003332; Effectiveness of in situ air sparging for removing NAPL gasoline from a sandy aquifer near Perth, Western Australia. @article{Johnston2002EffectivenessOI, title={Effectiveness of in situ air sparging for removing NAPL gasoline from a sandy aquifer near Perth, Western Australia.}, …
عرض المزيد
Based on extensive investigations and mathematical modeling of the physical, hydro-chemical and hydraulic behaviors during air sparging in a semi-confined aquifer, …
عرض المزيد
Copyright © 2024 Sofol Industry & Technology Group Co., Ltd.
المنتجات
محلول
حول الولايات المتحدة
اتصل بنا