Application of Decanter Centrifuge in Waste Oil Production

I. Core Application Scenarios (Including Specific Cases)

1. Industrial Waste Oil Regeneration (Machinery/Auto Repair/Refining)

• Treatment Objects: Waste lubricating oil, hydraulic oil, gear oil, engine oil, emulsified waste oil, and refining sludge.

• Process: Waste oil heating (60–90℃) + demulsification → three-phase decanter → oil (reuse/refining), water (up-to-standard discharge), solid (oil content < 5%, hazardous waste reduction).

• Case: For an auto repair cluster treating waste engine oil, an LW650 three-phase decanter with a processing capacity of 15 m³/h is used. After separation, the oil purity is ≥ 95% (usable as base oil), the water oil content is < 100 ppm, the solid phase oil content is < 4%, and the hazardous waste disposal cost is reduced by 70%.

2. Waste Cooking Oil/Gutter Oil for Biodiesel Production

• Treatment Objects: Kitchen gutter oil, waste frying oil, and oil skimmings from oil-water separators (high solid content, high water content, high acid value).

• Process: Crude oil impurity removal → heating (80℃) → three-phase decanter → clean oil (for biodiesel/industrial fuel), water (for biochemical treatment), residue (for feed/organic fertilizer).

• Case: For a kitchen waste project in Inner Mongolia with a daily processing capacity of 20 tons, an LW550 three-phase decanter produces transparent oil with water and residue content < 2%, which is directly supplied to biodiesel factories; the dried residue is used as feed for mealworms, with no secondary pollution.

3. Oilfield Oily Sludge and Tank Bottom Sludge

• Treatment Objects: Oilfield spilled sludge and tank bottom sludge (sand/rust/heavy metals + crude oil + water).

• Process: Sludge conditioning (heating + demulsification) → three-phase decanter → recovered crude oil (90–95%), water (reinjection/treatment), dry residue (oil content < 0.5%, landfilled/used for brick making).

• Case: For a petrochemical plant treating tank bottom residue, a single Tricanter® three-phase decanter processes 100,000 tons annually, with the value of recovered crude oil exceeding 10 million yuan. The solid waste volume is reduced to 10% of the original, and the incineration cost is greatly reduced.

4. Pretreatment Before Waste Oil Refining (Improving Refining Efficiency)

• Treatment Objects: High-impurity waste oil, rancid waste oil, and mixed waste oil.

• Function: Coarse separation by decanter removes large particles, colloids, and free water, reducing the burden on subsequent disc fine separation, distillation, and hydrogenation, and preventing blockage and corrosion.

• Indicators: After pretreatment, the oil has solid content < 0.5% and water content < 1%, extending the service life of downstream equipment by more than 30%.

5. Pretreatment of Oily Wastewater (Emission Reduction + Recovery)

• Treatment Objects: Oily wastewater from machining/cleaning and refining wastewater (emulsified oil + fine suspended solids).

• Function: Two-phase decanter removes solids and demulsifies, recovers floating oil, reduces the oil content of wastewater to 50–100 ppm, reduces the biochemical load, and recovers valuable oil.

II. Core Advantages (Waste Oil Production Scenarios)

• Three-Phase One-Step Separation: A single equipment can produce oil, water, and residue simultaneously, with a short process and small floor space.

• Large Processing Capacity & Continuous Operation: Single unit capacity ranges from 5–50 m³/h, with 24-hour automation, suitable for large-scale waste oil regeneration plants.

• High Separation Precision: Separation factor of 3000–3500, capable of removing 5μm fine particles, oil purity of 95–98%, and solid phase oil content < 5%.

• Resistant to Complex Working Conditions: 316L/duplex stainless steel corrosion resistance, suitable for high-acid, high-viscosity, and high-solid waste oil.

• Environmental Protection & Economy: Hazardous waste reduction by 70–90%, recovered oil can be directly reused or sold, with an investment payback period usually < 1 year.

III. Typical Process Flow (Three-Phase Decanter as Core)

Waste Oil Raw Material → Heating Tank (60–90℃) → Demulsification/Conditioning → Three-Phase Decanter

• Oil Outlet: Clean oil (sent to refining/directly used as fuel)

• Water Outlet: Oil content < 100 ppm (sent to biochemical treatment)

• Residue Outlet: Dry residue (oil content < 5%, hazardous waste disposal/resource utilization)