OPS Soil Washing Plant
The OPS Soil Washing Plant can be fully mobile or a fixed site facility.
The mobile plants can be laid down and commissioning in a single day and similarly can be decommissioned, cleaned and removed in a day. This enables large savings when material needs to be transported from one place to another.
The OPS soil washing product has been used to treat oil contaminated soil, heavy metals (both adhered to particles and leachable), PAH, PFOS etc.
The OPS Classifier can be seen in the centre of this picture – sand is screwed form the base whilst the cyclone removes further solids to a specified cut. The classifier comes from the OPS Oily Sand products.
OPS work together with the client to assess the design basis of the plant:
- Nature of the soil (PSD, mineral analysis)
- Nature of the contaminants (leachable, non leachable, presence on different particle sizes
- Required clean-up
- Environmental impact
- Cost Impact
A typical plant consists of:
- Hopper feeder
- Pre-screen (star screen, vibrating grizzly, finger deck)
- Primary sizing deck and wash
- Slurry unit
- OPS AEV Sand Scrubber
- Classifier with sand take off
- Trash screen to remove floating debris
- Thickener Clarifier
- Sludge Tank and Dewatering
- Water Treatment
- Electro or chemical coagulation
- Media absorption
- Mini press the dewatering precipitate
- Water Storage and re-use
Cyclone dropping onto a dewatering bed – the >100 micron sand deposited directly from the classifier leaving the cyclone to concentrate on the fines.
Trash Screen removing floating debris to 2mm.
The key to OPS soil washing is to assess where the contamination lies and to separate that fraction. The sand is cleaned by the AEV and not by the cyclone action and is separated using the OPS classifier which leaves the cyclone to be selected to give the cut that isolates the contaminate into the cake. For example a d80 cut at 35 micron means that a substantial amount of silt is dropped onto the sand bed on the dewatering bed meaning that fines production is reduced, clean up levels met and the client gets a soil back rather than a sand.
As engineering systems integrators, we combine cost efficient 'off the shelf' products with our high throughput proprietary processes. Integrated by best in class process control into a single solution individually engineered to site conditions, OPS deliver consistent performance, reliability and optimised life cycle costs.