Solids Separation Equipment
Many liquids and solids can be divided using the force of gravity. This process can be accelerated using a centrifuge.The centrifuge separates solids from liquids using centrifugal forces many times greater than the force of gravity. This separation effect occurs in just the same way as it would in a settling tank but in the case of the centrifuge the tank is in the form of a stainless steel bowl that is spun at high speed. The settled solids accumulate at the bowl wall and are then discharged by means of a helicoidally shaped screw known as a scroll, which pushes the solids from the cylindrical section of the bowl, up through the conical section and towards the discharge ports. The liquid phase, known as the centrate, finds its way back down the centrifuge bowl where it flows out over a “weir plate”, as it would in a lagoon, and falling by gravity down the discharge pipe.
The process of separating the liquid from the solid matter is sometimes called dewatering.
- Sewage sludge dewatering
- Materials recovery
- Dewatering of paper mill sludges
- Clarification of vegetable processing liquors
- Applications in petrochemicals
IWE’s rotary thickener is used for the thickening of industrial and municipal sludges with the use of polyelectrolyte.
Its main function is to thicken sludge from 0.3 to 4% up to 6 to 8% dry solids, thereby reducing sludge volumes for disposal.
From the integral mixer the machine receives treated sludge onto the internal surface of a wedgwire drum. The rotating action of the drum causes the free water to pass through the wedgewire whilst trapping the solids on the surface of the drum.
Continual rotation forces the solids to the discharge end causing further dewatering of the sludge. The thickened sludge is discharged to a hopper from where it is pumped away.
- SAS sludge thickening
- Primary sludge thickening
- Co-settled sludge
- Potable water sludge (Ferric)
- Industrial sludge
Centrifuge Filters for Abrasives
WE’s abrasive centrifuge filters have been designed to handle separation duties where the abrasive nature of the solids makes it impossible for either decanter centrifuges or disc stack separators to be considered. They provide a solution to industrial solid liquid separation for a wide range of applications.
The centrifuge has a vertically mounted bowl rotating at high speed. The mixture of abrasive solids and the liquid is fed into the machine where the heavy phase, the abrasive solids, are forced to the bowl wall by centrifugal force while the liquid phase, the centrate, is collected.
The solids accumulate at the bowl wall where they build up and discharged at pre set intervals. This is a fully automated process allowing the centrifuge to operate continuously without operator intervention.
Any mixture that will settle out into a heavy and a light phase under normal gravity can be considered for treatment . These machines produce between 1000 and 2000 G and since the solids stay static at the wall of the bowl there is no wear.
The applications for the AS range are:-
- Treating Cooling Liquids from Grinding or Polishing
- Wastewaters from processes using glass bead or powders.
- Waste Oil Cleaning
- Paint sludge.
- Sludge dewatering of small sludge volumes.
IWE can provide separation equipment installations on a “turnkey” basis designing complete systems or processes and working closely with our customers. We are also able to operate under our project management and control. Since we have expert knowledge of all our technologies, and considerable process knowledge, we know how these can be combined to achieve optimal performance from the process.