dewatering unit

GN screw press dewatering unit is designed and made to treat sludge and sewage waste water. GN screw press dewatering machine is widely used in sewage treatment projects of municipal, aquaculture, food, starch, oil, pharmaceutical, chemical, paper, leather and other industries.

GN screw press dewatering unit is a kind of economic and environmental friendly sludge dewatering treatment product. It is a new type of sludge extrusion dewatering equipment by using the principle of screw extrusion, through the strong squeezing force generated by the change of screw diameter and screw pitch, and the tiny gap between the floating ring and the fixed ring, to realize solid-liquid separation.

GN dewatering screw press unit includes below items:
1.PLC Smart control electrical panels for automatic control.
2.Chemical enhancing dewatering system for mixing and dosing flocculants into the waste water, slurries or sewage.
3.Sludge thickening and dewatering device
4.Liquid collecting tank to receive the recovered water from the screw press treatment.

GN dewatering screw press unit is with automatic control technology, which can mix and enhance flocculants automatically. After chemical enhancing, the screw dewatering press unit can running continuously to complete the sludge thickening and squeezing, finally return or discharge the collected filtrate liquid.

Besides dewatering screw press unit, GN Solids Control also makes automatic tank cleaning system. GN system is running automatically after preset parameters of the control panel. By adding the right tested chemicals, operators can achieve a satisfied liquid separation result. It can save time and save water in this case to further save cost. Some users of automatic tank cleaning system mentioned that, before without the automatic tank cleaning system they took 4 ~ 5 workers to clean one tank with 4-6 hours, now they just need 2 workers to clean one in 2-3 hours. It saves 80% man power and operation time.

If clients could share some technical demands, GN Solids Control is willing to check with engineering team and offer a customized solution to suit for clients; projects.

After oil and gas well drilling, there are a lot of drilling fluids cannot be used, as the drilling job is finished. The drilling mud may come from the usual solids control equipment which is used for oil well drilling mud recycling system, like from shale shakers, desanders, desitlers, mud cleaners, designers, degassers. And in some oil well drilling rig sites, the drilling mud may come from the decanter centrifuge separation.

And the drilling fluids are hazardous to environment. They are not allowed to be discharged into environment directly. Clients need to treat the used drilling mud after drilling well finished. The solid equipment mentioned above are used for the circulation of drilling mud. But after drilling, there should be another separation equipment to treat the recovered clean drilling fluids. The new approach is to dewater the drilling mud after use of drilling mud to reuse water.

Drilling mud used in oil well drilling is recovered from solids control equipment like shale shaker, mud cleaner, desander, desilter and decanter centrifuge, there is no big size solids side the solids. The PSD (particle size distribution) is variable but around figure will be 30% of below 5 microns. If it is water base mud, the water content is around 80 ~ 90%. And the solids content is 10 ~ 20%. There is no oil for water base mud.

In this case, clients will need to do dewatering treatment to recover the water from drilling fluids for reuse. This is a conventional dewatering of water base mud to produce reusable water and the challenge is on the economic side as the effluent water must be of the same price compared to landed price to rig site of fresh water. After dewatering treatment, clients want to get Semi clear water with neutral pH reusable (water parameters still to be determind).

If you are interested for the proposals to dewartering the used drilling mud from oil well drilling, please visit the GN Solids Control website:
Or contact GN Solids Control sales engineers.

GN Solids Control is a professional manufacturer for liquid and solids separation. In order to rich the company’s product lines, GN Solids Control developed a separation brand: GN Separation. GN Separation (www.gnsepararation) is a separate brand developed by GN Solids Control.

GN Solids Control major business is oil and gas drilling mud separation and waste management, non-oil field drilling fluids cleaning and recycling, replacement shaker screen manufacturing, like solids control shale shaker, high G drying shale shaker, desander mud cleaner, desilter mud cleaner, degasser, decanter centrifuge, vertical cuttings dryer, centrifugal pump, jet mud mixing system, mud agitator, etc…

GN Separation is focusing on making more industrial separation equipment, like various sizes industry separation decanter centrifuge, disc centrifuge, 3-phase separation centrifuge, screw conveyor, etc…

This week, GN Solids Control and GN Separation will exhibit at IE Expo China 2020 in Shanghai. IE Expo China is exhibited in Shanghai Every July. It is the largest professional exhibition focusing on environment protection and solution:

http://www.ie-expo.cn/Overview/profileGN Solids Control and GN Separation will take the typical waste management equipment for showing to the clients. Unlike other equipment supply, they can only make some of the separation equipment, some one can only make shale shakers, some one can only make centrifuges, some one can only make chemical dosing system. GN Solids Control makes the full line separation equipment, and GN Solids Control is capable to combine the system to be a full function system. Below is the major production for the exhibition:

1) Oily sludge separation system.
It is a 1-skid modular unit C/W shale shaker separation, waste management high speed decanter centrifuge for liquid and soil separation, chemical dosing system, disc. Centrifuge for soil water and oil 3-phase separation. Transfer pumps, level meters, control panel, storage tanks, pipelines and other necessary accessories are included in the system in order to offer turn key solution to clients.

2) Slurry separation decanter centrifuge. GN Solids Control and GN Separation is capacity to make different bowl sizes centrifuges.

3) Sludge and solids transfer vacuum pump for long distance suction and discharge.

 

 

GN Solids Control is a professional manufacturer to make different sizes Solids Removal Variable Speed Centrifuge includes stand, feed pump and connecting hoses, and other processing equipment and accessory processing equipment before and after decanter centrifuge.

GN Solids Control makes Variable speed from 0 up to 4,000 RPM per different models. GN Solids Control is capacity to make both VFD control decanter centrifuge and full hydraulic drive (FHD) decanter centrifuge per meet clients’ request.
GN Solids Control brand decanter centrifuge is designed with high G-force to get a better separation performance.

GN Solids Control has big bowl decanter centrifuge vary from 18 inch to 22 inch, and max. to 30 inch for big fluid processing rate. In the world, few companies have the capability to make big bowl decanter centrifuge up to 30 inch. GN Solids Control is one of them who have the abilities.
GNLW553 VFD decanter centrifuge is a 22 inch bowl decanter.
GNLW453 VFD decanter centrifuge is a 18 inch decanter.
GNLW363 VFD decanter centrifuge is a 14 inch decanter.
Roughly, for the same conditions, 1 set 22inch decanter = 2 x 14 inch decanter centrifuge.

And 1 set 18 inch decanter = 1.4 x 14 inch decanter. The operators cannot expect to use an 18 inch decanter centrifuge to replace 2 x 14 inch decanter or to replace a 22 inch decanter.

GN Solids Control 14 inch, 18 inch and 22 inch decanter centrifuge can all be used for heavy mud solids control. And also some clients want to use the decanter centrifuge for different applications like for barite recovery, HGS (high gravity solids), LGS (low gravity solids), waste management, and dewatering treatment, or other different applications, the centrifuge features are not all the same. When GN Solids Control makes the design for standard models, GN Solids Control need to balance the performance for all the situations. If clients have fixed applications with the centrifuge, suggest clients to share the information to GN Solids Control sales engineer before order to get and best solution to suit for the projects and maximized the separation performance.

 

5 sets of high speed big bowl decanter centrifuge start to service at a power plant for dewatering application. The model of the 5 sets big bowl decanter centrifuge for dewatering is GNLW454E. It is a 18 inch big bowl decanter centrifuge specialled designed for waste water treatment.

Compared with normal big bowl decanter centrifuge, GNLW454E has a bigger ratio of bowl diameter and bowl length. The ratio is up to 4. It means the slurry will go through a longer separation path while going through the bowl. So the liquid can will be clean while be discharged, and the solids phase will be more drier.

The working principle of the decanter centrifuge is as follows: the decanter centrifuge bowl and the screw conveyor rotate at the same direction and at high speed. But the rotating speed of bowl and screw conveyor is not the same. In this case, there will be a certain differential speed between centrifuge bowl and screw propeller. And the differential speed is at the same direction with centrifuge bowl and screw impeller rotation.

The material is continuously introduced into the inner cylinder of the screw conveyor through the feed pipe, and enters the bowl after acceleration. The lighter liquid phase forms an inner liquid ring, which overflows the bowl continuously from the large-end overflow port of the bowl, and is discharged, out of the bowl through the liquid discharge port at another end.

Besides GNLW454E 18 inch decanter centrifuge, GN Solids Control also has other sides centrifuge models for various applications.

9 inch decanter centrifuge: GNLW223, GNLW224 series
14 inch decanter centrifuge: GNLW363, GNLW364 series
18 inch decanter centrifuge: GNLW452, GNLW453, GNLW454 series
22 inch decanter centrifuge: GNLW553 series
30 inch decanter centrifuge: GNLW764 series
Besides decanter centrifuge, GN Solids Control makes dewatering unit, oil water separator, shale shaker, mud cleaner, and other separation equipment.

18 inch is a popular big bowl decanter centrifuge which is widely used for drilling mud treatment and drilling waste management. But for different applications, clients’ demands for the output liquid and output solids / soil varies greatly.
For example, when the 18 inch decanter centrifuge is used as solids control equipment in drilling fluids processing system for barite recovery, or for mud weight reducing, big treating capacity is demanded.

The jobsites want to get a big drilling fluids input and output, When the jobsites want to reduce mud weight to a qualified PPG, they want to reach a bigger mud input into the decanter centrifuge, and the output liquid can be reduced the qualified mud weight. But they do not have specified demands for the solids outputs from the decanter centrifuge. For this applications, a bigger conveyor speed (differential speed) can push the input drilling fluids go through centrifuge internal screw propeller faster.

If the mud can pass through the centrifuge internal bowl faster, the total mud volume going through the centrifuge in a certain time is bigger, it means bigger capacity. Furthermore, specified liquid dam boards are used in this application, the purpose is to enlarge the solids output volume. During this operation, the operators can get bigger handling capacity.

But if the big bowl decanter centrifuge is used for dewatering, or used for water / liquid purification, a relative lower conveyor speed (differential speed) and high bowl speed should be used. The purpose is to extend the rotation time of the materials inside the centrifuge bowl, and in order to extend the separation time of the material along the bowl screw. After centrifugal force separation, the purified liquid (maybe water with ultra-fine soil) is discharged from the liquid output port. Soil will settle down along the bowl screw and then been throw out from the solids output port.

In order to choose the right decanter centrifuge model and type, the clients should contact GN Solids Control sales engineer to communicate the material situation for the right model recommendation.

GN Solids Control sells many 9 inch small size decanter centrifuges to South America every year. A few days ago, some sets of Solids Liquid Separation Small Decanter Centrifuge for South America Client are ready for shipment.

9 inch is a small size decanter centrifuge used for solids and liquid separation. It is normally used in diamond drilling slurry separation system. The 9 inch Solids Liquid Separation decanter centrifuge is also popular used in mining industry waste water treatment system.

GN 9 inch Solids Liquid Separation Small Decanter Centrifuge is specially designed for small capacity, small footprint, and fine solids separation.

The Bowl material GN 9 inch Solids Liquid Separation Small Decanter Centrifuge is SS 304 by forging. Similar as popular size 14 inch decanter centrifuge, the Screw protection of GN 9 inch Solids Liquid Separation Small Decanter Centrifuge is with Tungsten Carbide Tiles for longer life time and for easier replacement.

Bowl solids discharge port of GN 9 inch Solids Liquid Separation Small Decanter Centrifuge is protected by Ceramic casing, solids blocking ring avoid solids building up. Bowl assembly supported by tighten belt for protection bearing during transportation.

 

Besides 9 inch Solids Liquid Separation Small Decanter Centrifuge, GN Solids Control is also capacity to make other solids liquid separation equipment, like other sizes decanter centrifuge. Shale shaker, mud cleaner, etc…

Besides centrifuges, shale shaker and mud cleaner, GN Solids Control makes full line drilling mud processing equipment, like mud agitator, centrifugal pump, vacuum degasser, mud gas separator, jet mud mixer, screw conveyor, slurry pump, solids sludge vacuum pump, screen vacuum unit, vertical cuttings dryer, high G dryer, dewatering system, solidification unit, etc…

GN Solids Control can also make full package drilling mud purification and recycling system to treat drilling mud and drilling cuttings from various drilling activities (oil and gas drilling, HDD, CBM, water well drilling, TBM, piling, micro tunneling).

This is the last working week before Chinese Lunar New Year holiday, after that offices and workshops will be closed for a 2-week holiday. All GN workers are working day and night in order to ship as more as orders before the 2-week holiday.

Some dewatering centrifuge units are dispatched to sea port, they will be exported to a Southeast Asia client. The dewatering centrifuge units will be used for TBM mud treatment. TBM is short for Tunnel Boring Machine, it has a wide application in railway, hydropower, transportation, mining, municipal and other tunnel projects.

Drilling mud is used to lubricate drilling bits during Tunnel and Boring drilling activities. For environment protection, the drilling mud and waste water must be recycled and reused during and after the drilling activities. Besides normal mud desanding plant, dewatering centrifuge unit is also requested in some application to treat the waste water.

GN dewatering centrifuge unit consists of big bowl big ratio decanter centrifuge, and chemical dosing unit. The decanter centrifuge and chemical dosing system is combined as a full package unit to remove as more ultrafine solids as it can do. The decanter centrifuge and chemical dosing system are both allocated inside a fabricated container. The full package can be shipped as a shipper owner container during international shipment. And the containerized design can protect the centrifuge and chemical dosing system, which values much. And they are easy for shipment between different jobsites.

Decanter centrifuge itself is a Physical separation machine. It can only separate solids by particle sizes. It cannot remove ultrafine solids smaller than the cut point. By chemical dosing, the ultrafine solids can be flocculated, and reach the centrifuge cut point for solids removal.

Besides dewater centrifuge unit, GN Solids Control makes full line desanding separation equipment for TBM and other trenchless no dig activities, like shale shaker, desander, desilter, etc…

This week, a package of oil sludge treatment system was departed to an oil field service company in China. The unit will be used to recovery oil sludge from oil base drilling cuttings. The oil sludge treatment system including below items:
1) 2 phase decanter centrifuge. Material fed to 2 phase decanter centrifuge must be with solids content Less 20% and Particle Size less than 20mm.
2) 3 phase disc centrifuge. The solid phase material entering the three phase disc separator usually shall be reduced the solid content to less than 3% and the solid particles to less than 400 micrometers by the decanter centrifuge, then the three-phase disc separator can achieve the best effect.


3) Transfer pumps
4) Dewatering chemical dosing system with dosing pumps and automatic control system
5) Transfer tank and holding tanks for mud recovery and mud transfer.

The project is for processing oil and solid wastes in sludge storage tanks. After the oily sludge wastes have been pre-treated. After the oil sludge wastes have been treated by sieving, sand washing, demulsify, and finely screened, they have now achieved reductions and preliminary separation. After that, the oily sludge will be treated for three-phase separation.

Two phase decanter centrifuge and three phase disc centrifuge is used in the three phase separation process. After three phase centrifuge separation, the final outputs are soil, oil and water.

Chemical dosing system is used before 2 phase and 3 phase centrifuge separation to help for the removal of as more fine solids as possible.

Besides 2 phase decanter centrifuge, 3 phase disc centrifuge and chemical dosing sytem, GN Solids Control also offers other oil sludge treatment and transfer equipment, like 3 phase decanter centrifuge, high G drying shale shaker, mud cleaner, Vertical cuttings dryer, Drilling Cuttings Solidification Unit, Thermal Desorption Unit (TDU), oil water separator, sludge vacuum pump, screw conveyor, etc…

This week, a full package of compact oily sludge separation system was finished from GN factory in Beijing China. The compact design fast movable oily sludge treatment system is purchased by a reputable Environmental Solutions Company from China domestic market.

There are 3-stage separation equipment included in the oily sludge treatment system.

1) There is a 2-panel small footprint shale shaker equipped in the system for coarse solids separation. The model is GNZS752. As mostly, the oily waste come out from different sources and it is mixture of different wastes. There may be big size solids in side. The big sides solids may block or even broken the centrifuges. The small size shale shaker is used to remove the possible big size solids in the sludge.

2) There are 2 centrifuges in the oily sludge treatment system. The first centrifuge we call it decanter centrifuge. The decanter centrifuge model is GNLW224, it is a 2-phase separation centrifuge. The 2-phase decanter centrifuge is help to remove solids or soil from liquid mixture. The 9 inch centrifuge is a min size decanter centrifuge. The bowl diameter is only 9 inch, but the bowl length and diameter ration is up to 4. The longer ration can help to get cleaner liquid. It is the smallest centrifuge from GN Solids Control for industry separation.

3) The second centrifuge inside the oily sludge treatment system is disc centrifuge. It is also called 3-phase centrifuge. As the name mean, the disc centrifuge can separation oil, water and soil.

Many people may wonder: in case the disc centrifuge can separate and get oil, water and soil. While you add 2-phase decanter centrifuge inside the system? Really, the 2-phase decanter centrifuge is surely not to increase the cost. The disc centrifuge can only allow liquid mixture with liquid content less than 3%. Otherwise, it will damage the centrifuge. While the decanter centrifuge can allow liquid with solids content up to 15% ~ 20%. Decanter centrifuge is a necessary as pre-separation before disc centrifuge.