High Oil Yield and Low Residue Content Three-Phase Decanter Centrifuge for Kitchen Waste Oil Recovery

Kitchen Waste Oil Decanter Centrifuge is designed for continuous three-phase separation of oil, water, and solid residue from kitchen waste oil streams. 

For most kitchen waste oil recovery applications, the recommended configuration is a three-phase tricanter centrifuge because the process usually needs to separate light oil, heavy water phase, and solid residue at the same time.

• Kitchen waste slurry treatment
• Food waste pretreatment slurry separation
• Gutter oil recovery
• Grease trap scum treatment
• Oil-water-solid mixed slurry separation
• Restaurant waste oil recovery
• Organic waste pretreatment before downstream treatment

Typical materials include waste cooking oil, animal and vegetable fat, water, food residue, suspended solids, sand, fibers, organic sludge, and grease trap floating scum.

• The feed usually contains oil, water, and solid residue at the same time.
• The main target is not only sludge dewatering, but also oil recovery.
• A three-phase machine can discharge the light oil phase, heavy water phase, and solid cake separately, which improves recovery efficiency and reduces downstream treatment load.

• If the feed contains mainly solids and water with very low oil content, a two-phase decanter may be enough.
• If the oil is highly emulsified, heating or demulsification may be required before centrifuge separation.
• If the feed contains large impurities, bags, plastics, bones, or coarse solids, upstream pretreatment is necessary before entering the centrifuge.

1. Kitchen waste oil slurry enters the rotating bowl through the feed pipe.
2. Under centrifugal force, heavier solid particles move outward and form a sediment layer.
3. The screw conveyor continuously pushes the separated solids toward the discharge end.
4. The heavy liquid phase, mainly water, is discharged through the water outlet.
5. The light liquid phase, mainly recovered oil, is discharged separately through the oil outlet.

• Continuous automatic operation
• Simultaneous separation of oil, water, and solids
• Higher recovered oil value
• Lower solids content in recovered oil
• Reduced oil load in the wastewater phase
• Reduced residue volume and disposal cost
• Stable separation performance for kitchen waste slurry
• Flexible configuration according to heating condition and emulsion condition
• Compact footprint compared with traditional multi-step separation systems

With proper pretreatment, heating, and feed control, the three-phase tricanter centrifuge can typically achieve:

• 85–95% recovered oil rate
• 1–3% residual oil impurity level
• 2–5% moisture in recovered oil
• Below 1–3% oil content in discharged water phase
• 60–75% solid cake moisture
• 30–50% residue volume reduction

Actual results depend on feed composition, emulsion condition, operating temperature, and separation settings. Pilot testing is recommended when the material varies significantly.

What is the difference between a two-phase and a three-phase decanter centrifuge?

A two-phase decanter separates solids and one liquid phase. A three-phase tricanter centrifuge separates solids, light liquid, and heavy liquid at the same time. For kitchen waste oil recovery, a three-phase tricanter is usually preferred because the feed contains oil, water, and solid residue.

Is heating required before separation?

In many kitchen waste oil applications, heating helps reduce viscosity and improve oil release. The required heating condition depends on oil type, emulsion condition, solids content, and target recovery rate.

Is demulsification required?

If the oil is strongly emulsified, demulsification or conditioning may be required before centrifuge separation. If the oil exists mainly as free oil, heating and mechanical pretreatment may be enough.

What information is needed for model selection?

Please provide feed material, capacity, solids content, oil content, temperature, viscosity, emulsion condition, target oil recovery rate, target oil quality, and operating hours.

Can this machine be supplied as a complete skid?

Yes. We can provide the tricanter centrifuge together with feed pump, heating unit, control cabinet, oil tank, water tank, cake conveyor, and skid-mounted accessories if required.

To recommend a suitable model, please share:

• Feed material name
• Capacity requirement
• Oil content
• Solids content
• Water content
• Feed temperature
• Heating condition
• Emulsion condition
• Target oil recovery rate
• Target oil quality
• Operating hours
• Material or corrosion requirements
• Site voltage or control preference

Our engineering team can suggest a suitable three-phase tricanter centrifuge configuration based on your kitchen waste oil recovery project.