Oil Sludge Treatment

Sludge treatment is a complete set of production technology, using the principle of oxidation demulsification and centrifugal separation. ZK oil sludge separation equipment can effectively separate oil, water and solid components in the oil sludge mixture, providing the best solution for the treatment of oil sludge.

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ZK SEPARATION Decanters for Oil Sludge Treatment Process

After the oily sludge is collected and heated by steam, a suitable number of additives like demulsifier and active agent are added to it, so as to break the emulsified state of oily water. After demulsification, a high-efficiency LWS series three-phase decanter is adopted to realize the continuous separation of oil, water, and slag in the oily sludge, and the water separated and the oil-water mixture not demulsified are directly sent to the sewage treatment system for treatment. Then, an LW series two-phase decanter with high efficiency is used for the process of dehydration. The crude oil residue in the dehydrated slag phase can be recovered by the combustion or thermal desorption process. After that, the separated crude oil can be collected and purified by a 3 phase disc stack separator to get purified oil which can be reused.

Oil Sludge Centrifuge Parameters
Model LWS250x1025B(X) LWS350x1550B(X) LWS450x1845B(X) LWS520x2150B(X) LWS580x2400B(X) LWS650x2600B(X)
Speed (rpm) 5000 4000 3500 3200 3000 2800
Max G Force 3500 3136 3087 2982 2948 2854
Main Motor (kW) 11 22 30 45 55/75 75/90
Back Motor (kW) 4 5.5 7.5 15 18.5 22
Capacity (m3/h) >1 >3 ~ 5 >5 ~ 10 >10 ~ 15 >15 ~ 20 >20 ~ 30
Weight (kg) 1250 2500 4000 5200 6500 8000
Dimension (mm) 2500x800x1150 3700x1050x1400 3800x1150x1600 4800x1250x1800 5300x1750x1382 5600x1850x1500
Drive Type VFD + PLC + HMI
Bowl Material SUS2205(Duplex Stainless Steel) / SUS2304 (Duplex Stainless Steel) / 316L / 316 Centrifugal Casting
Screw Material SUS2205(Duplex Stainless Steel) / SUS2304 (Duplex Stainless Steel) / 316L / 316 Centrifugal Casting
Bearing SKF / NSK

Oil Sludge Treatment Process

  1. Sludge treatment is a complete set of the production process, using the principle of oxidative demulsification and centrifugal separation. Its main equipment is composed of dosing system, feeding system, separation system, conveying system, and control system.
Oil sludge treatment process

ZK Oil Sludge Centrifuge Features and Benefits

  • Low Infrastructure Cost, Humanization Design

    ZK oil sludge centrifuge feature with simpler pipe structures at the inlet and outlet, fully closed operation, and a more humanized operating environment. The skid-mounted integrated device has the characteristics of compact structure, convenient installation, low requirements for infrastructure construction, convenient overall movement, etc., which is widely used in the harmless treatment of oil-bearing sludge in oilfield drilling.

  • Ingenious, Unique, and Diversified Heavy Liquid-phase Discharging Structure

    The heavy liquid phase separated by the three-phase centrifuge can adopt two different liquid discharging modes, namely gravity discharging and discharging through the built-in centripetal pump with pressure, wherein the latter includes liquid layer fixed mode and the online adjustable mode of heavy phase liquid layer,which is selected according to the process conditions.

  • High-Performance Wear and Corrosion-resistant Cemented Carbide

    As the oily sludge contains a lot of hard particles and impurities such as sand, glass, and metal, if the centrifuge does not adopt a reliable wear-resistant configuration, its longevity and running stability will be seriously affected. The wear-resistant solution is completely targeted. According to the material characteristics (PH value, corrosive substance, solid particle size hardness, etc.), cemented carbide or ceramic can be selected, and the cemented carbide can be either YG6, YG8, or various modified tungsten-cobalt alloys with the hardness of 89 ~ 93 (HRA), which can fully meet the application fields of the centrifuge.

  • High-Performance Stainless Steel

    The high-performance three-phase centrifuge can recover oil by 90%~-95% and adapts to the liquid density difference (oil and water comparison) of the gas and oil of different densities (0.1~0.08 g/cm3). The centrifuge needs more than 3000G separation factor to achieve better separation. To ensure the stability and the service life of the centrifuge, high-strength corrosion-resistant duplex stainless steel SAF 2205 is used.

  • Light Phase Liquid Layer Adjustment Technology

    From the current three-phase centrifuge structure for liquid transportation of centripetal pumps adopted at home and abroad, the adjustment of the light phase liquid layer requires disassembling the centrifuge, and replacement takes more than 8 hours. The centrifuge, with the patented technology of our company, just requires opening the hood to adjust the light phase liquid layer.

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Oil Sludge Treatment Application Cases

Why Choose ZK Decanter Centrifuge?

Reliable Quality

The bowl (core component) is made of SAF 2205 duplex stainless steel by centrifugal casting process, and its performance is superior to conventional 304 and 316. All weld joints have undergone flaw detection and thermal treatment, and are provided with certificates of conformity or records for traceability.

Stable Operation

The dynamic balance precision of the centrifuge is ≥ Class 2.5, which is superior to the requirement of the standard, so that the centrifuge can be operated smoothly and its longevity is extended. The noise of the complete machine is < 85 dB, the vibration intensity is < 7.1 (load) and 4.5 (no-load). It is equipped with a mechanical and electrical dual overload protection device to ensure safe operation.

long service
Long Service Life

The screw conveyor and bowl adopt of the most advanced, reliable and convenient wear-resistant treatment technology and structure in China. All bearings adopt original imported NSK/SKF bearings. The electric control box is made of electrical elements of famous brands such as Siemens and Schneider.

High Degree of Automation

ZK decanter differential speed automatic control technology can automatically adjust the screw conveyor’s differential speed, to prevent overload and blockage. The complete machine is equipped with bearing temperature sensor and vibration sensor, and is provided with alarms for main motor overload, differential over torque, low differential speed, etc. Meanwhile, its supporting frequency conversion (flameproof) control cabinet can realize automatic start and stop with one key.

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