oil sludge treatment system

One unit of oil sludge treatment system for China client is shipped out recently, the design treating capacity is 15m3/h. A complete 15m3/h oil sludge treatment system made by GN solids control including vacuum pump unit, pre-mixing tank modular, shale shaker modular, chemical dosing unit, decanter centrifuge and 3 phase separation centrifuge modular. According to different material, we can provide customized design to add or remove the modular. The compact design in modular is for convenient operation and transportation.

  1. Vacuum pump is widely used to transfer waste oil, oil tank bottom cleaning sludge, drilling cuttings, drilling fluids, soils, sand, it is 100% air operated pump without electricity power.
  2. The vacuum pump transfer the oil sludge to pre-mixing tank modular, which with heating pipeline inside the mud tank to heat the oil sludge up to 60 degree. With chemical jetting and heating process, the emulsified oil can be easily treated and remove from the solids.
    For free oil sludge, it can be treated by shale shaker modular directly.
  3. The shale shaker modular with sealing cover and internal spray system is to separate the coarse solids from the oil sludge and reduce the solids content, it will protect the decanter centrifuge in the next step and extend the working life of the centrifuge screw propeller. If the solids content is too high, the screw propeller will be easily damaged; and the big solids will be easily block the centrifuge bowl.
  4. The decanter centrifuge can separate the fine solids from the oil sludge to reduce the solids content below 5%, by using proper demulsifier and chemicals, the separation cut point is up to 1 microns. The fluids treated by decanter centrifuge flow to the buffer tank then flow to the disc centrifuge, the disc centrifuge can separate oil, water and solids .

Recently GN solids control shipped mini decanter centrifuge of solids liquid separation to South America clients. The mini decanter centrifuge can be widely used for the applications as: waste water treatment, diamond core drilling slurry treatment, and other solids liquid separation project. We have 2 different models of mini decanter centrifuge for option, the technical specification is as below:


GNLW223D, the bowl diameter is 9 inch, bowl length is 26.4 inch, max speed is 4500rpm, normally we use 3800rpm to archive 1777G, the separation cut point is 2 ~5 microns, gearbox torch is 500N·M, this decanter centrifuge is normally used for core drilling solids removal unit, the SRU including mini shale shaker , mini decanter centrifuge ,feeding pump, transfer pump, mixing hopper, mixing pump, mud tank, slurry collection pump and pipelines. It can treat the slurry and recovery water, the client can save water consumption and save drilling cost.
It can be also used for oil sludge separation system, GN compact design oil sludge treatment unit is a 1m3/h oil sludge treatment system, including mini decanter centrifuge, 2 panel shale shaker, pre-mixing tank, oil sludge collection tank, centrifuge feeding pump, disc centrifuge, butter tank, oil storage tank, water storage tank, chemical dosing unit.


GNLW224EP-VFD, with same diameter bowl 9 inch, the bowl length is 36.4 inch, max speed is 5000rpm, the normal speed is 0~4500rpm, the max G force is 3077G, typical G force is 2492G, the gearbox ratio is 95:1, gearbox torch is 1400N.M, this model centrifuge with longer bowl length, and higher G force, it is suitable for waste water treatment, by working with flocculants, the decanter centrifuge can separate the ultra-fine solids from the waste water, so that it is qualified to be treated by chemicals in the next process.
For more information, pls contact GN solids control.

Recently one set of oil sludge treatment system is ready for shipment to a oilfield environmental solutions company with customized painting color. GN solids control can design and produce standard oil sludge treatment system with different treating capacity 1m3/h, 5m3/h, 15m3/h, also we can design as per client’s concept and technics process.


A standard oil sludge treatment system is consist of the modular below:

  1. Waste transfer unit: GN use our own solids vacuum pump to transfer the oil sludge from the waste pit to pre-mixing modular. The features of vacuum pump: (1)100% air operated pump without using electricity power, need air compressor for air supply. The user need to prepare one air compressor to provide air for both vacuum pump and the positive pressurized VFD control panel of the decanter centrifuge.
    (2) can be adopted to different types of oil sludge, heavy duty for continuously working

  2. (3) automatically and manually working for option for different requirement
    (4) max discharge distance is up to 1000m, max suction distance is 50m, it can used into the crude oil tank without labors in, it is user friendly pump to transfer the oil sludge out of the crude oil tank bottom.
    2 pre-mixing modular: including a pre-mixing tank equipped with heating lines inside the tank wall, when the user supply hot steam to the heating lines, the oil sludge will be heat to 60 degree for easier separation in the next separation step. Mud agitator with control panel to agitate the oil sludge with necessary chemicals and keep it flowable. The submersible slurry pump will transfer the pre-mixing oil sludge to the next process- coarse solids separation modular.
    3 coarse solids separation modular: it might be removed depends on if there is coarse solids in the oil sludge.
  3. fine solids separation modular for solids/ liquid separation by using VFD decanter centrifuge, and working together with chemical dosing system
  4. 3 phase centrifuge modular to separate oil from water.

GNLW554EP is big bowl big volume decanter centrifuge with bowl diameter 22 inch and L/D ratio 4.2. It is the ideal decanter centrifuge for dewatering unit, it can be also used for oil sludge treatment system. The technical specification is as below:


Centrifuge model: GNLW554EP-VFD
Bowl diameter: 22 inch (550mm)
Bowl length: 91 inch (2310mm)
Designed capacity: 600 gpm (136m3/h)
Typical capacity: 480 gpm(108m3/h)
Max bowl speed: 3150 rpm
Typical bowl speed: 0~ 2800 rpm
Max G force: 3051G
Typical G force: 0 ~ 2412G
Cut point: 2 ~5 microns
Differential speed: 0 ~45 rpm
Gearbox Torch: 12000 N.m
Gearbox ratio: 35:1
Main motor: 90KW (120HP)
Back drive motor: 45KW (60HP)
The max capacity is measured for water, it will be various as per different material conditions, like oil sludge, dredging slurry, drilling waste, drilling fluids, industrial waste water, etc.
The decanter centrifuge can be drived by VFD control panel, which is positive pressuried VFD control panel with PLC smart control and touch screen , 3 motor VFD, main motor, back drive motor, pump motor, self cooling system or external air conditioner for suitable environmental temperature -20~+40℃ or -20~+55℃.
The centrifuge features is as below:
1) The bowl of GN centrifuge is made from Duplex Stainless Steel SS2205 or SS2304 by centrifugal casting which is better than SS304 or SS316.
2) The solids discharge port is made from Tungsten carbide inserts, The mud distribution port is made from Tungsten carbide inserts, the anti-abrasion will extend the life for heavy mud anti-abrasion will extend the life.
3) 3 Stage balancing process to maximize the balance of the centrifuge include 1800RPM low speed balancing and real operation high speed balancing as well as the assembly balancing.
4) The Screw is protected by interchangeable Tungsten Carbide Tiles for longer life and easy maintenance.

One set of oil sludge treatment system is ready for shipment for one client in China. The technical configuration for GN oil sludge treatment system is as below:


1) Pre-mixing tank modular: including mud tank, heating lines inside mud tank, handrails, walkway, pipelines, stairs, etc. Submersible slurry pump as feeding pump of shale shaker, mud agitator to mix the oil sludge after heating and chemical jetting process, liquid level meter and electric control system.
2) Coarse shaker modular: including mud tank with heating lines, shale shaker installed on the shaker tank with internal spray system and sealing cover, mud agitator to mix the oil sludge, liquid level meter, and mud tank accessories with lightings, electric control system.


3) Centrifuge modular: including decanter centrifuge with feeding pump, 3 phase centrifuge with flushing pump, decanter centrifuge installed on the mud tank to separate solids from fluids, the clean fluids flow to 3 phase centrifuge to separate oil from water, the pure oil is recovered and flow to buffer tank with liquid level meter. The pure water is flow to buffer tank with liquid level meter, it can be pumped to water storage tank automatically or back to the circulation to reuse.
4) Chemical dosing system to add chemicals in premixing tank and centrifuge package modular, all the accessories are installed in the container for convenient shipment and better production.


We have 3 standard models oil sludge treatment system for option, with 1m3/h, 5m3/h, 15m3/h, we can also design customized oil sludge treatment system for our clients. Our engineer will fly to client’s jobsite for first time installation and commissioning and training the client’s engineer.
Except for oil sludge separation system, we also produce automatical tank cleaning system, waste water treatment unit,oil water separator, slant plate clarifier. And we have vacuum pump to feed the water to the oil sludge separation system.