Sludge Processing

Processing the collected sludge is carried out by a variety of units depending on defining factors such as kinematic viscosity, oil content, how easily the given type of sludge separates, solids content and presence of any toxic chemicals.

Low solids “fresh sludges” are generally easier to separate and may require only centrifugation and no real pre-treatment to achieve the require degree of separation. In this case we would use a specially designed decanter centrifuge.

The processing of sludge with low solid content is conducted using the following method.

The sludge is fed into the centrifuge. The 3000 g centrifugal force generated in the unit splits the oil/water/sediment by density. The sediment is discharged through the cone end directly into a container placed under the machine.

It may be necessary to add a flocculant  to assist with separation of more difficult sludges.


Обработка шламов Following centrifuge processing, the following remains:
  • Oil on solids < 1.5%
  • Oil in water < 0.5%
  • Water in oil < 2%
The sludge-processing throughput is on the order
of 15 m3/hour.


Sludges with high solids content and older sludges, which are more difficult to separate, are given a high level of pre-treatment prior to entering the centrifuge.

In cases where sludges contain a greater amount of hard components such as stones, the heavy solids are fed to a High Solids Pre-treatment
Unit ( HSPU). Where the sludge is contaminated with a high solid
content such as stones and debris the HSPU system will screen and remove the solids while heating and homogenizing the oil in preparation for centrifugation..

The stones and debris fall to the bottom of the HSPU holding area wherea drag bar system removes them. The solids are then washed while passing over a vibrating screen before dropping into a discharge container.

Обработка шламов