How much does soil vapor extraction cost?

SOIL TECHNOLOGY:	Soil Vapor Extraction
RACER PARAMETERS	Easy	Easy
COST PER CUBIC FOOT	$36	$11
COST PER CUBIC METER	$1,275	$405
COST PER CUBIC YARD	$944	$300

What is an SVE system?

Soil vapor extraction (SVE) uses vacuum pressure to remove volatile and some semi-volatile contaminants (VOCs and SVOCs) from the soil. Because the process involves the continuous flow of air through the soil, it often promotes biodegradation of low-volatility organic compounds that may be present.

How does soil vapor extraction work?

How Do They Work? Extraction: SVE involves drilling one or more extraction wells into the contaminated soil to a depth above the water table, which must be deeper than 3 feet below the ground surface. Attached to the wells is equipment (such as a blower or vacuum pump) that creates a vacuum.

What is soil vacuum extraction?

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 meant by Bioventing?

Bioventing is a technology that stimulates the natural in situ biodegradation of any aerobically degradable compounds in soil by providing oxygen to existing soil microorganisms.

What is thermal desorption unit?

With Thermal Desorption Units, contaminated material is exposed to heat indirectly by contact with a slowly turning drum that is exposed to heat on the outer shell. Vaporized contaminants are separated from the solids in the sludge, resulting in an end product that can be disposed of easily and cost-effectively.

How does dual phase extraction work?

How does dual-phase extraction work? In this process, one or more pumps are used to remove contaminants from the groundwater or to the soil. Using a single pump, the system uses high-pressure airflow to pull liquid droplets, filled with contaminants, from the soil. It also extracts groundwater at the same time.

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 biostimulation used for?

Biostimulation involves the modification of the environment to stimulate existing bacteria capable of bioremediation. This can be done by addition of various forms of rate limiting nutrients and electron acceptors, such as phosphorus, nitrogen, oxygen, or carbon (e.g. in the form of molasses).

What is Bioventing and Biosparging?

Bioventing is an in situ remediation method that enhances the biodegradation of contaminants (organic compounds) in the unsaturated soil zone. However, biosparging is not confined to the unsaturated zone, but rather extends remediation to the saturated zone of the soil matrix.

What is a SVE system?

SVE is applicable to the treatment of contamination located above the water table in unsaturated (vadose) zone soil. SVE system configurations can include vertical and/or horizontal extraction wells as warranted by site-specific conditions.

What are the advantages of free product in SVE technology?

This technology is primarily applicable to sites with moderate to higher permeability soils and lower moisture content. The presence of free product prolongs SVE system operation and increases costs of off-gas treatment.

How is Sve used for VI mitigation?

SVE is directly applicable as a method of VI mitigation for relatively small sites, such as a single building, where rented mobile systems or repurposed systems from other sites can be deployed relatively quickly. SVE can also be effective as VI mitigation at larger sites.

What is off-gas treatment for SVE operations?

Off-gas treatment from SVE operations is typically accomplished with the use of vapor phase granular activated carbon (GAC), thermal oxidation, or catalytic oxidation. The specific off-gas treatment technology used will depend upon the contaminant types, their concentrations, and local and state air discharge regulations.