What is air sparging used for?
Air sparging, also known as in situ air stripping and/or in situ volatilization is an in situ remediation technique, used for the treatment of saturated groundwater by volatile organic compounds (VOCs), such as crude oil hydrocarbon derivatives which is a widespread problem for the ground water health.
Is air sparging effective?
When used appropriately, air sparging has been found to be effective in reducing concentrations of volatile organic compounds (VOCs) found in petroleum products at underground storage tank (UST) sites.
What is the difference between air sparging and soil vapor extraction?
SVE extracts vapors from the soil above the water table by applying a vacuum to pull the vapors out. Air sparging, on the other hand, pumps air underground to help extract vapors from groundwater and wet soil found beneath the water table.
What is a Sparge system?
Geotech Air Sparge Systems are designed to provide positive air pressure into the subsurface thus aiding the volatilization and biodegradation process associated with soil vapor extraction technology.
What is remediation of soil?
The term “soil remediation” means returning the soil to a form of ecological stability together with the establishment of the plant communities it supported prior to disturbance (Allen, 1988).
What is soil vacuum extraction?
Soil Pollution Remediation In in situ SVE, also known as soil venting or vacuum extraction, vacuum is applied to the soil through the wells near the source of contamination, creating a negative pressure gradient to induce the controlled flow of air and remove the contaminants from the soil through an extraction well.
What is extraction wells?
Extraction well means a well used to extract contaminated fluids from the subsurface for the purpose of conducting an environmental remediation.
Where does contamination go that is underground?
More than half of it was deposited in landfills. Landfills are normally designed to protect against contaminant leakage. Complex systems of liners and protective layers are put down before dumping to prevent contaminants from seeping into the ground and contaminating natural resources.
What is sparging water?
Sparging is the rinsing of the mash grain bed to extract as much of the sugars from the grain as possible without extracting puckering tannins from the process. Typically, 1.5 times as much water is used for sparging as for mashing (e.g., 8 lbs. malt at 2 qt./lb. = 4 gallon mash, so 6 gallons of sparge water).
What is a sparger in bioreactor?
Sparger – In aerobic cultivation process, the purpose of the sparger is to supply adequate oxygen to the growing cells. Jacket – The jacket provides the annular area for circulation of constant temperature of water which keeps the temperature of the bioreactor at a constant value.
What is soil and groundwater remediation?
The principal objective of soil and groundwater remediation at any site is to remove the waste material or free product and/or reduce the concentration of contaminants in the soil and/or groundwater to specific land use acceptable levels.
What is air sparging and how does it work?
Air sparging involves the introduction of air into the aquifer throughout the contaminated zone. The injected air migrates through the soil in discrete channels (not as bubbles) and facilitates removal of volatile organic compounds (VOCs) from the groundwater via stripping or volatilization.
How many sparging points are there in an air-sparging system?
The air-sparging system consisted of 32 sparging points and had been previously operated in a continuous mode for two years before the field study was performed. The field study used instruments with continuous data logging capabilities to monitor the dynamic responses of groundwater and soil vapor parameters to air injection.
How do you pressurize a sparge system?
Sparge systems require air or sometimes other gases to be introduced and distributed into the aquifer. Typically, air is pressurized using an air compressor; however, when the dissolved-phase contamination is near the water table, a rotary lobe, rotary vane or similar blower can be used (USACE, 2013).
Does air sparging alter the direction of groundwater flow in aquifers?
Using air sparging to create a barrier to treat a dissolved phase plume and prevent further migration can alter the direction of groundwater flow due to partial displacement of water from pores and the resultant loss of transmissivity. Monitoring must be performed to ensure aquifer hydrodynamics are not adversely impacted.