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Pump container seen from the outside, placed just outside a building.

Download the Water treatment case here as PDF-file:

A project with strict restrictions regarding the water returned to the sewage system.

Drilling for an energy storage in the city of Lund in the south of Sweden was performed by the contractor Skånska Energi AB. A total of 17 holes were first casing advanced to 90 meter and then drilled down to a total depth of 250 meter. Casing OD was 168 mm and hole diameter 140 mm. The hammer used was the W120.

Geology was a mix of shale, clay, sand and sandstone. When drilling in this geology the return water from the hole contains a large fraction of particles in the micron range which are very difficult to sediment out from the return water. Since there were strict restrictions on the solids content in the water returned to the sewage system (in the order of 40 mg/liter) a solution had to be found.

The solution was to rent a centrifuge from Noxon, see, which reduced the solids content in the return water to a level acceptable to the environmental authorities.


The pump container - from the inside.

Equipment used

DTH hammer Wassara W120
Casing advancing system Ø 168 mm
Drill bit Ø 140 mm 
Drilling fluid

Clean water

Water treatment Centrifuge from Noxon 

Shale, clay, sand and sandstone


Please also read how one of our mining customers solved their problem:

Water recirculation system in mining environment at Konsuln

The mine company LKAB decided to interrupt the drilling operations in one of its mines in Kiruna, Sweden, owing to the increased wear of the pumps and water powered percussion hammers caused by the poor quality water.
The introduction of Wassara’s water handling system resulted in an increase of hammer life time by a factor of four.

Read the full version here!