ATEX Category 3 MPE remediation system
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We design and build for sale or for rental high vacuum dual-phase extraction or multi-phase extraction (DPE or MPE) systems for a wide range of application including ATEX certified plant for potentially explosive gases and liquids.

Typical Applications

Dual-Phase Extraction (Groundwater and Soil Vapour)

Just as submersible pumps may be used to de-water the formation for soil vapour extraction, this approach can achieve the same for lower permeability formations where it can increase both the groundwater abstraction rate and the soil vapour extraction rate. It is not cost efficient for higher permeability formations.

Please call to discuss.

Multi-Phase Extraction (Groundwater, NAPL and soil vapour)

Frequently adopted in the UK in the past and still typically demanded by some international clients with operations in North America and Australia, European ATEX regulations have rendered this technology almost cost prohibitive for potentially explosive liquids and gases for the following reasons:

  • The ingress of NAPL into the vacuum system renders concentration control (by dilution) impossible in the way that soil gas alone can be controlled by dilution in an SVE system.   Bio-slurping petrol for example will inherently therefore lead to an explosive atmosphere requiring at least an ATEX Category 2 if not probably Category 1 system with very significant cost implications
  • Furthermore as neither activated carbon nor a catalytic oxidiser can accept concentrations in excess of 25% of LEL, fixed flow dilution prior to treatment would be required leading to even more significant additional cost.
  • Even diesel/aviation fuel/kerosene becomes explosive under the reduced pressures (ie vacuum) required for bio-slurping.

Please call to discuss.

Related Technologies

Soil Vapour Extraction (SVE); Pilot Testing; Air Sparging; Steam Injection and In-Situ Conductive Heating, Catalytic Oxidation

Soil Vapour Extraction

Soil Vapour Extraction for lower permeability;

Typical Specifications

Cornelsen can build a system to match virtually any required design.  Our systems are the result of years of product evolution for reliability, safety and robustness.

A typical off-the shelf system available for rapid mobilisation and hire is summarised below:

  • 10’ Steel Shipping Container with insulation, electric light and ventilation
  • Max. Air Flow:  600m3/hr;
  • Max. Vacuum: -800mbar gauge (200mbar abs.);
  • Gas sampling and infra-red LEL detection system (Not Inline)
  • Gas tight valves,
  • 400 litre moisture and particulate separator with ATEX Level controls and progressive cavity discharge pump;
  • Control Panel with PLC and telemetry with SMS alarm text messages and remote dial in access.



tipTech Tip:
The installation of in-line LEL detection systems in MPE plants is typically poorly applied. Failure to condition the soil vapour for the flow, pressure, humidity and temperature parameters required by the LEL detector head render the readings useless.