What is the function of air sparger?
Air sparging involves injecting air through wells into the contaminated aquifer below the groundwater table. The air sparging process cleans the contaminated groundwater zone through two processes. First, injection of the air creates a turbulent condition that enhances volatilization of the contaminants.
What is in situ air sparging?
In-situ air sparging The process by which air is injected directly into the saturated subsurface to volatilise contaminants from the liquid phase to the vapour phase for treatment and/or removal in the unsaturated zone, and to biodegrade contaminants in the saturated and unsaturated zone via stimulation by the …
What is ozone sparging?
Injecting ozone to oxidise organic contaminants. This is generally combined with SVE in the unsaturated ground to capture any residual ozone gas emanating from groundwater.
Is the process of using injection wells to bubble air through groundwater?
Air sparging is the process of injecting air directly into groundwater. Air sparging remediates groundwater by volatilizing contaminants and enhancing biodegradation. It is akin to blowing bubbles from a straw into a bowl of water.
What is air sparging in soil remediation?
Air sparging is a subsurface contaminant remediation technique that involves the injection of pressurized air into contaminated ground water causing hydrocarbons to change state from dissolved to vapor state. The air is then sent to the vacuum extraction systems to remove the contaminants.
What is an air sparger bioreactor?
Air sparging (i.e., two-phase gas-liquid flow) is extensively used to minimize surface fouling and enhance permeate flux. Although effective, air sparging can be expensive. In membrane bioreactor (MBR) applications, air sparging can account for over 30%–40% of the total energy demand for wastewater treatment [1].
Where is Bioventing used?
Bioventing is most often used at sites with mid-weight petroleum products (i.e., diesel fuel and jet fuel), because lighter products (i.e., gasoline) tend to volatilize readily and can be removed more rapidly using SVE.
What is dual phase extraction?
Dual-phase extraction, also known as multi-phase extraction, vacuum-enhanced extraction, or bioslurping, is an in-situ technology that uses pumps to remove various combinations of contaminated groundwater, separate-phase petroleum product, and hydrocarbon vapor from the subsurface.
What is a soil vapor extraction system?
Soil vapor extraction (SVE) uses vacuum pressure to remove volatile and some semi-volatile contaminants (VOCs and SVOCs) from the soil. The gas leaving the soil may be treated or destroyed, depending on local and state air discharge regulations.
How does an airlift reactor work?
An airlift bioreactor works by agitating the contents of the bioreactor pneumatically using gas. The gas used for agitation can act to either, introduce new molecules to the mixture inside of the bioreactor, or remove specific metabolic molecules produced by microorganisms.
What is co2 stripping in bioreactors?
in large scale bioreactors. A carbon dioxide stripping model can be. used to better understand and optimize parameters that are critical. to cell culture processes at the manufacturing scale.