Multi-phase extraction refers to the extraction of pure product along with groundwater and / or soil vapor. The extracted phases are separated and treated or discharged aboveground. Usually multi-phase / two-phase extraction is referring to the technique that removes LNAPL (light non-aqueous phase liquid) and groundwater. See also pump and treat and soil vapor extraction.
Multi-phase extraction is used particularly for mineral oil, CVOC and BTEX as LNAPL. This technique is mainly used to clean the saturated zone and a part of the unsaturated zone. To apply multiple phase extraction the soil must be moderately to well permeable. Multi-phase extraction is usually applied to the source.
The duration of this remediation technique depends on the size and type of contamination and could take years to decades. The level of site disturbance depends on the chosen treatment technique, but is mostly minimal.
Related cases and HIP-pilots
Related cases: Aerobic bioremediation of oil and BTEX (The Hague)***, Amsterdam: mineral oil, BTEX **, Kampen (IJsseldijk): Mineral oil, BTEX, naphthalene**, Lochem: mineral oil,BTEX,PAH,naphthalene,creosote ***, Military petrol station: ISCO for mineral oil and BTEX*, Nijverdal (Smidsweg 100a):BTEX, PAH’s, naphthalene and mineral oil**, Petrol station: combined techniques for BTEXN and oil (Putten)***, Rotterdam-Botlek: BTEX*, Rotterdam-Botlek: VAM-spill*, Tiel: TEX (xylenes), Zwolle Russenweg: Mineral oil, turpentine **
Related HIP-pilots: HIP-pilot ‘Acoustic remediation’