Advanced Slop Oil & Tank Bottom Sludge Treatment
The ZK Oil Sludge Centrifuge is a specialized 3-phase decanter designed to tackle the most demanding hydrocarbon waste streams. By applying high centrifugal force, it continuously separates complex emulsions into clean oil, clarified water, and dry solid cake. Built with stringent ATEX/IECEx compliance and severe-duty wear protection, it is the ultimate solution for maximizing resource recovery while meeting strict environmental regulations.
Core Performance Metrics
High Oil Recovery: Recovers 80% to 95% of valuable liquid oil from sludge, turning hazardous waste into a revenue stream.
Superior Oil Quality: The separated oil phase typically contains ≤ 2-3% BS&W (Basic Sediment and Water), ready for refining.
Volume Reduction: Discharged solid cake achieves 40-60% dryness, reducing total hazardous waste volume by over 80%.
Continuous Operation: Fully automated PLC control ensures stable 24/7 operation even with fluctuating feed concentrations.
Typical Applications
Core Technologies for Oil & Gas Applications
Processing oily sludge presents unique challenges: highly abrasive sand, corrosive chemicals, fluctuating oil/water ratios, and explosive atmospheres. ZK centrifuges are engineered with industry-leading features to overcome these hurdles reliably.
3-Phase Separation Principle
Technology: The centrifuge utilizes distinct discharge paths for three phases. Heavy solids are conveyed by the scroll to the conical end. The light liquid phase (oil) and heavy liquid phase (water) flow to the cylindrical end and are discharged through separate outlets.
Adjustable Interface: Equipped with an adjustable centripetal pump (impeller) or interchangeable weir plates. Operators can precisely adjust the separation interface during operation to accommodate changing oil-to-water ratios in the feed, ensuring high oil purity and clean water discharge.
ATEX / IECEx Explosion-Proof Safety
Hazardous Area Compliance: Fully certified for operation in Zone 1 and Zone 2 hazardous environments. Equipped with Exd IIB T4 or Exd IIC T4 explosion-proof main and back drive motors.
Nitrogen Blanketing System: To prevent explosive atmospheres, the centrifuge features a sealed design with a continuous inert gas (Nitrogen) purging system. Integrated oxygen sensors monitor the internal environment, automatically shutting down the system if oxygen levels exceed safe thresholds.
Severe-Duty Wear Protection
The Challenge: Oil sludge often contains high concentrations of abrasive silica sand, grit, and catalyst fines.
The Solution: ZK protects critical wear zones with premium materials. The scroll conveyor flights are armored with replaceable Tungsten Carbide Tiles. The solids discharge ports are fitted with solid tungsten carbide or sintered ceramic inserts. The feed distribution zone is hardened to withstand the initial impact of abrasive slurries, extending the maintenance lifecycle significantly.
Corrosion-Resistant Metallurgy
Material Excellence: Petrochemical waste streams frequently contain high levels of chlorides, hydrogen sulfide (H2S), and varying pH levels. The centrifuge bowl and scroll are centrifugally cast from premium Duplex Stainless Steel (SAF 2205 or SAF 2304) or 316L.
Benefit: Duplex stainless steel provides exceptional resistance to stress corrosion cracking and pitting, ensuring structural integrity and longevity in aggressive chemical environments.
Technical Specifications
ZK offers a comprehensive range of oil sludge centrifuges, available in both standard 3-phase (LWS) and Explosion-Proof (LWF) configurations to match your specific processing capacity and safety requirements.
Explosion-Proof Decanter Centrifuge (ATEX Zone 1/2)
| Model | Speed (rpm) | Max G Force | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Dimensions (mm) |
|---|---|---|---|---|---|---|
| LWF350×1435C | 4000 | 3136 | 22 | 5.5 | 4~8 | 3800×1050×1200 |
| LWF450×1845C | 3400 | 2913 | 37 | 11 | 8~12 | 4800×1150×1450 |
| LWF520×2150C | 3200 | 2982 | 55 | 15 | 15~18 | 5400×1250×1600 |
| LWF580×2400C | 3000 | 2923 | 75 | 22 | 20~25 | 5900×1400×1700 |
| LWF650×2650C | 2800 | 2854 | 110 | 30 | 25~35 | 6500×1650×1800 |
LWS 3-Phase Decanter Centrifuge (Standard Environment)
| Model | Speed (rpm) | Max G Force | Main Motor (kW) | Back Motor (kW) | Capacity (m³/h) | Dimensions (mm) |
|---|---|---|---|---|---|---|
| LWS350×1435 | 4000 | 3136 | 22 | 5.5 | 3~5 | 3500×1280×1058 |
| LWS450×1845 | 3500 | 3087 | 30 | 11 | 6~12 | 4000×1350×1100 |
| LWS520×2150 | 3200 | 2982 | 45 | 15 | 10~15 | 4800×1540×1250 |
| LWS580×2400 | 3000 | 2948 | 55~75 | 18.5 | 15~20 | 4900×1705×1250 |
| LWS650×2600 | 2800 | 2854 | 75~90 | 22 | 20~30 | 5900×1865×1300 |
Oily Sludge Treatment Process Flow
To achieve optimal separation, oil sludge typically undergoes pre-treatment (heating to 70-85°C and chemical demulsification) before entering the centrifuge. This reduces oil viscosity and breaks emulsions, allowing the high G-force of the ZK decanter to effectively split the mixture into clean oil, water, and dry cake.
Proven Success in the Petrochemical Industry
ZK centrifuge equipment is extensively utilized by leading oilfield services and environmental protection companies. Our solutions transform hazardous liabilities into profitable recovered resources.
Efficient Oil Sludge Separation for a Major Petrochemical Plant
The Challenge: A petrochemical facility needed to process aged tank bottom sludge containing 10-15% solids and highly emulsified oil.
The Solution: The process incorporated pre-treatment—adding demulsifiers and heating the sludge to 85°C. The conditioned material was fed into a ZK LWF Explosion-Proof 3-Phase Decanter Centrifuge.
The Result: The system achieved remarkable separation. Post-separation, the water content in the recovered oil dropped to 0.8%, and the oil content in the discharged water reduced to 2-3%. The solid cake retained only 1.5% oil. This impressive 95% liquid oil recovery rate significantly cut hazardous waste disposal costs and generated new revenue from the recovered crude.
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Eco-friendly Treatment of Land-based Oil Spills
The Challenge: An environmental remediation company required a robust system to treat challenging, sand-heavy land-based oil sludge from historical spills.
The Solution: The dirty oil sludge was mixed with water and heated in a homogenization tank before being processed by a ZK 3-phase decanter equipped with heavy-duty tungsten carbide wear protection.
The Result: The centrifuge successfully handled the highly abrasive sand content without excessive wear. It recovered clean oil for resale, separated water for standard effluent treatment, and produced a dry, sand-heavy cake that was repurposed as raw material for an oil well cement plant, achieving a zero-waste outcome.
Get Your SolutionFrequently Asked Questions
A 3-phase centrifuge uses high centrifugal force to separate a mixture into three distinct phases based on density. In oil sludge treatment, the heaviest phase (solid sand/grit) is pushed to the bowl wall and conveyed out by a scroll. The intermediate phase (water) and the lightest phase (oil) form concentric liquid layers. An adjustable impeller or weir plates independently skim and discharge the clean oil and water from the cylindrical end of the machine.
Processing oil sludge releases volatile organic compounds (VOCs) and hydrocarbon gases. If these gases mix with oxygen inside the high-speed rotating centrifuge, it creates a severe explosion risk. A Nitrogen Blanketing System continuously purges the centrifuge interior with inert nitrogen gas, keeping the oxygen concentration below the Lower Explosive Limit (LEL), ensuring safe operation in ATEX Zone 1 or Zone 2 environments.
Oil sludge, especially tank bottom and drilling sludge, contains highly abrasive silica sand and grit. ZK protects the centrifuge by installing replaceable Tungsten Carbide tiles along the scroll conveyor flights, using solid tungsten carbide or ceramic inserts at the solids discharge ports, and applying hard-facing to the feed distribution zone. This severe-duty protection drastically reduces wear and extends the maintenance lifecycle.
When the oil sludge is properly pre-treated (heated to 70-85°C and treated with appropriate demulsifying chemicals to break emulsions), a ZK 3-phase centrifuge can typically recover 80% to 95% of the liquid oil present in the sludge. The recovered oil usually has a BS&W (Basic Sediment and Water) content of less than 3%, making it suitable for refinery reprocessing.
Why Choose ZK SEPARATION ?
As a professional manufacturer of liquid and solids separation equipment, ZK SEPARATION is committed to providing our customers with products of the highest quality, safety and best performance. We are certified to ISO 9001, ISO 28001, ISO 14001, CE, EAC, DNV, GOST-R and other international standards.
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