Phase Recovery / Pump Technology
Free phases of mineral oil are often found close by tank farms and petrol stations due to leakages. Free-phase product, typically known as "light non-aqueous phase liquids" (LNAPL) such as petrol, diesel, kerosene, aviation gas etc., or dense phase or "dense non-aqueous phase liquids" (DNAPL) can be recovered by a wide range of different technologies.
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The selection of the best technology has to be made by evaluating several site specific factors. BAUER Environment Group offers several techniques:
- Dual- / Multiphase-Extraction
- XITECH-Products
- SIPEX-Products
- Skimmers
Dual- / Multiphase-Extraction
| Dual-phase extraction is an established technique for the simultaneous extraction of contaminated groundwater and soil vapour (Bioslurping). More commonly used in silty or clayey soils, where a higher vacuum is required, the technique obviates the need for submersible pumps. High vacuum soil vapour extraction improves the feasibility of soil vapour extraction in lower permeability soils. The deeper vacuum increases the radius of influence and the mass transfer of volatile contaminants. Multiphase extraction uses the same principal as dual-phase extraction typically employing explosion proof water ring vacuum pumps. However, through control of the depth of the extraction lance, the technique allows the controlled extraction of free-phase NAPL/DNAPL, even lubricant or crude oils along with groundwater and soil vapour. |
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XITECH
| Smart Skimmers are capable of recovering free product ranging from lubricating oil to diesels and petrol at temperatures up to 70 °C and 400 mBar vacuum conditions. Together with our subsidiary in the UK GRS Ground Remediation Systems Ltd. (www.remediation.com) BAUER Environment Group is the European sales partner of XITECH Instruments Inc. (www.xitechinc.com). |  |
SIPEX
| The SIPEX system is a motorised system capable of tracking the product/water interface over a range of up to 5 metres using conductivity sensors and a telescopic lance. Product is extracted to the surface either by a pneumatic discharge pump mounted on the lance down the borehole, or by a surface mounted vacuum system. SIPEX was developed by FWS Filter- und Wassertechnik. |  |
Advantages
- SIPEX tracks the interface accurately in most product types and is especially useful for dense products which are similar in specific gravity to water. No further subsequent phase separation is necessary
- Selected removal of the free phase through broadly dimensioned inlets
- Explosion proof in all variants
- Chemical resistant materials
Coalescence Separator
Coalescent units can be used to enhance the oil/water separation efficiency.
BAUER Environment Group Phase Recovery Projects:
Kerosene Phase Recovery on a former Military Airbase (Brand, Germany)
Remediation of a Kerosene Contamination by Phase Recovery (Bioslurping) in Huelva (Spain)
Oil Phase Separation by a Coalescent Unit (Bergrheinfeld, Germany)
