How to clean contaminated soil - Soil washing plant

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Soil washing (or soil scrubbing) is a technology to remove contaminants from soil (or other wastes) by a liquid (water or water with chemical additives).
As a result of the separation process, the volume of contaminated material requiring further treatment or disposal is significantly reduced. In other words, it washes pollutants out from the solid matrix and/or suspends and separates fine solid particles which usually bind majority of inorganic and organic contaminants.

The applicability of soil washing method is mainly affected by the percentage of fines (particles with a diameter less than 0,063 mm) in the soil. If the percentage of fines is high then there will only be a small volume reduction in the amount of treated material and the efficiency of the soil washing process will be low. Generally, it is considered that if the fine content of the soil is above 25% then soil washing process will not be effective.

PLANT DESCRIPTION
DEKONTA´s SWP-20 soil washing plant is designed as a transportable modular equipment which consists of the following main parts:

- Soil feeding unit comprising a soil feeder bin (5 m3), a scalping vibrating screen, a belt weight feeder and a belt conveyer
- Soil washing unit comprising a drum washer (diameter 2,3 m, length 5,5 m) and a trommel screen (size 5 mm)
- Classification unit comprising a spiral classifier (diameter 0,5 m, length 4,0 m), two hydrocyclones (diameter 150 mm), a slurry tank and a slurry pump
- Sludge thickening unit comprising a sedimentation tank (20” container), a bottom sludge scrapper, sludge removal system and two pumps
- Sludge dewatering unit comprising a filter press, equipment for chemicals preparation and dosing, filter cake discharging and collecting equipment (the unit comes in two 20” containers)
- Water treatment unit (20” container)
- Control room with electric switchboard (20” container)

Видео How to clean contaminated soil - Soil washing plant канала DEKONTA, a.s.