Groundwater Pump and Treat Systems
- A wide range of electric or pneumatic pumping systems;
- For in-situ remediation, site dewatering, leachates;
- Pump and pipework system design;
- Supply, install and commission
- Associated pipeworks and control systems
- Treatment systems
- Maintenance and fault diagnosis
Groundwater Pump and Treat
As part of an in-situ remediation project or construction site dewatering works, Cornelsen can provide a pumping system and integrate with the necessary treatment plant. Borehole pumps, sump pumps, trash pumps etc.
Cornelsen has supplied and installed systems deploying a wide range of grounwater absrtaction pumps. These include pumps for:
- Submersible pumps for groundwater hydraulic control, transfer or backwashing;
- Submersible pumps for dual-phase (dual pump) product recovery;
- Self priming suction pumps;
- Sludge pumps;
- Progressive cavity transfer pumps;
Most of these pumps are installed as part of a groundwater pump and treatment programme, as enabling works for construction sites or for hydraulic control and mobilisation of a free phase product (LNAPL) plume.
NAPL Recovery, DNAPL and Skimmer Systems
We can offer all the necessary equipment including control systems, oil storage tanks with ATEX high level shut-off control, oil/water separators, compressors etc. With the exception of the pumps and in some cases the controllers, these systems are usually available for rental as well as sale.
We can offer DNAPL pump and also heater elements for enhanced recovery of more viscous oils.
Click here to view our skimmer and DNAPL pump range.
Where significant LNAPL thicknesses are present, timed product recovery can greatly increase the rate of LNAPL recovery. This is because continuous removal of product by skimming from the well allows the groundwater level in the well to rebound in the well to a level potentially higher than that in the surrounding formation. This can impede NAPL flow into the well both as a physical barrier and by displacing NAPL from the nearby soils around the well making the soil “oil wet”.
The addition of Soil Vapour Extraction to LNAPL skimming or Total Fluids abstraction can greatly increase the product recovery rate (Vacuum Enhanced Product Recovery). Sometimes in excess of 100% improvement.
High vacuum, multi-phase extraction system (bio-slurping)
Pneumatic top filling “total fluids” pumps for relatively low permeability formations
Key advantages: Simultaneously develop a cone of depression to mobilise LNAPL to the recovery well and remove the NAPL; no electrical power or downwell level control systems required reduces site infrastructure required;
Disadvantages: Low flow rate may be insufficient in some formations to draw the water level down sufficiently. Combined fluid flow requires the inclusion of an oil water separator in the water treatment plant with risk of iron hydroxides and iron bacteria growth and fouling.
The addition of Soil Vapour Extraction to LNAPL skimming or Total Fluids abstraction can greatly increase the product recovery rate (Vacuum Enhanced Product Recovery). Sometime in excess of 100% improvement.
Dual-Pump Installations (Submersible and Skimmer pumps)
The combination of an electric submersible pump and a skimmer for NAPL removal
Advantages: The submersible pump can be specified for essentially any groundwater flow rate necessary to achieve the required drawdown. The water level can be controlled by level probes or pressure transducers and so maintained within the skimmer pump’s travel range. An oil/water separator is not required, thus reducing the maintenance which may be associated with metal hydroxides and bio-fouling.
Disadvantages: The need for a larger diameter borehole, minimum 200mm.
For combined pump dual-pump extraction projects, installing the submersible pumps deeper within the well can greatly reduce the concentrations of dissolved phase organic contaminants which require treatment and yet still achieve the desired cone of depression.