Soil vapour extraction is a technology used in the remediation of soil, sediment, bedrock and sludge. It is also generically known as in-situ soil venting, in-situ volatilisation, enhanced volatilisation, or more commonly, soil vacuum extraction.
Releases of Dense Non-Aqueous Phase Liquids (DNAPL) to ground and groundwater presents a significant challenge to site remediation as relatively small volumes can result in extensive contamination.
Light Non-Aqueous Phase Liquids (LNAPL) spills present a significant challenge to remediate. They can result in extensive contamination from small spillages and their mobilisation can be more extensive than that of DNAPL.
Volatile Organic Compound (VOC) is an organic compound that volatilises or vaporises under normal conditions. Technically this can be described as participating in a photoreaction.
Landfill leachate is the liquid formed within a landfill site. It is formed by a mixture of liquids present in the fill deposited into it and rain water.
Air Sparging is an in-situ technology used in the remediation of groundwater. It is generally used in conjunction with Vapour Extraction techniques and is known to have a positive effect on the unsaturated zone of the soil.
Bioslurping is the combination of free product recovery and bioventing utilising vacuum enhancement technology. It has the ability to improve bioremediation of the Vadose Zone as the vacuum enhances release of free product from the capillary fringe.
Chemical oxidation of groundwater and soils is often used in conjunction with other treatments such as Pump and Treat or Vapour Extraction. It is an in-situ method of treating contaminants such as VOCs, hydrocarbons, pesticides, polycyclic aromatic hydrocarbons (PAH) and polychlorinated biphenyl's (PCB).
There are a number of descriptions for dual-phase extraction but in essence it is the removal of both contaminated groundwater and soil vapour at the same time.
Pump and Treat is the most common form of groundwater remediation. In simple terms groundwater is pumped to a water treatment system from either abstraction wells or excavations.
Bioremediation is an environmentally sound, and cost effective method, of treating hydrocarbon contaminated soils. This technology minimises the amount of soil to be disposed of to landfill.