What is a dual phase extraction system?

What is a dual phase extraction system?

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.

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.

How does soil vapor extraction work?


  1. Soil vapor extraction (SVE) uses vacuum pressure to remove volatile and some semi-volatile contaminants (VOCs and SVOCs) from the soil.
  2. At some locations where the compounds have low volatility, heating the soil while venting can increase the removal rate of SVE by raising the vapor pressure of contaminant.

What is multi-phase extraction remediation?

Multi-phase extraction uses a vacuum system, which can also be combined with a downhole pump, to remove various combinations of contaminated groundwater, separate-phase petroleum product, and vapors from the subsurface. The system lowers the water table around the well, exposing more of the formation.

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 are the factors that affect effectiveness of soil Vapour extraction?

The primary factors in designing a cost-effective off- gas vapor treatment system are the initial contaminant mass in more permeable and less permeable soils, the rate of contaminant removal, and the contaminant’s subsequent decay over time.

How long is SVE?

In situ SVE projects are typically completed in 1 to 3 years. Cost: The key cost driver information and cost analysis was developed in 2006 using the Remedial Action Cost Engineering and Requirements (RACER) software.

What are extraction wells?

Purpose of Recovery Wells (Extraction Wells) All factors produce unfit and unsafe groundwater for human use. Recovery wells stop this transaction from occurring. When a recovery well (extraction well) is installed, it extracts these pollutants on a long term or short basis.

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 ISCO remediation?

In situ chemical oxidation (ISCO), a form of advanced oxidation process, is an environmental remediation technique used for soil and/or groundwater remediation to reduce the concentrations of targeted environmental contaminants to acceptable levels.

What is bioventing and Biosparging?

Bioventing is the aeration of the unsaturated vadose zone to stimulate aerobic biodegradation. Biosparging is the injection of air into the groundwater to provide oxygen for groundwater remediation.

How is dual phase extraction used in groundwater remediation?

One of the more common methods used in soil and groundwater remediation is known as dual-phase extraction. It is called dual-phase extraction because it works to extract both contaminated groundwater and soil vapor. Other names for this include bioslurping, multi-phase extraction, and vacuum-enhanced extraction.

How does dual phase extraction ( DPE ) work?

Dual- phase extraction (DPE), also known as multi-phase extraction, is a technology that uses a high-vacuum system to remove both contaminated groundwater and soil vapor. In DPE systems a high-vacuum extraction well is installed with its screened section in the zone of contaminated soils and groundwater.

How does RSI’s dual phase extraction system work?

The introduction of RSI’s portable and mobile DPE/MPE modules to our Soil Venting Equipment (SVE) system allows us to effectively perform dual-phase extraction, removing the petroleum hydrocarbons (NAPL phase) pooled above groundwater, hydrocarbon vapors, and contaminated water at the water table.

When to use dual phase sand silt extraction?

Dual phase extraction works best for permeable sand-silt mixtures. Impermeable (clayey) or excessively permeable (gravel/sand) soils are more recalcitrant. o Depth to the base of contamination is the secondary driver, as an increased thickness and depth of contaminated groundwater increases cost.

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