waste water treatment

This week we shipped one unit of GNLW454EP decanter centrifuge and one batch of screw conveyor are shipped to waste water treatment company.
GNLW454EP decanter centrifuge technical specification is as below:


The bowl diameter: 450mm (18 inch)
Bowl length: 1890mm(74.5 inch)
Bowl speed: 3500rpm
Max G force:3084G
L/D ration: 4.2
Main motor power: 55KW
Back drive motor power: 22KW
Beach angle: 11 degree
Bowl material: duplex stainless steel 2205 by centrifugal casting
Screw material: duplex stainless SS316L
Screw impeller protection by tungsten carbide tiles for longer working life and reliable operation
Drive system by VFD control panel with PLC smart control and HMI interface.


GNLW454EP decanter centrifuge is used for waste water treatment by working with chemical dosing system. Except for this model decanter centrifuge, GN also produce 9 inch bowl, 14 inch bowl, 18 inch bowl, 22 inch bowl, 30 inch bowl decanter centrifuge with different treating capacity. They can be used to treat materials for oil & gas drilling mud, drilling waste, oily sludge, industrial waste water, mining tailings, dredging slurry, etc. The G force and operation speed influenced the separation performance a lot.


The screw conveyor is widely used to transfer the material with high solids content. Each section with 12ft length, we can select different qty sections to meet customer’s requirement, 1 section length is 12ft, 2 sections is 24ft, 3 sections is 36ft, 4 section is 48ft. Each auger with protection cover to avoid spilling outside the auger. The flights are made of Mn Steel, wear-resistant coatings can be also sprayed to extend the using life. The bearing is from FAG or NSK brand for reliable performance. The water flushing pipe is equipped outside the auger for flushing.
If you need waste water treatment decanter centrifuge and screw conveyor, pls contact with GN solids engineer.

2 units of GNLW554EP are shipped to a domestic company for waste water treatment. The project is to treat industrial waste water in an industrial area in Yunan Province.


As one of the professional decanter centrifuge manufacturer in China, GN solids control can design and produce decanter centrifuge for different applications, with different bowl size, including 9 inch bowl, 14 inch bowl, 18 inch bowl, 22 inch bowl, 30 inch bowl. Each bowl size with different bowl length, for example, for 9 inch bowl centrifuge, we have GNLW223D, GNLW224D-VFD, GNLW224D, GNLW224D-VFD for solids removal unit for mining waste water treatment and slurry cleaning. Also we have GNLW224EP series to treat industrial waste water. For 22 inch bowl decanter centrifuge, GNLW553C-VFD is for solids control and drilling waste management and dewatering unit, GNLW554EP is mainly for industrial waste water treatment. The technical specification is as below:


Bowl diameter 22 inch, bowl length 91 inch, designed capacity is 600gpm, typical capacity 480gpm, max G force is 3051G, typical G force 2412G, max bowl speed is 3150rpm, typical bowl speed is 2800rpm, the cut point is 2~5 microns, differential speed is 0 ~ 45 rpm, gearbox ratio is 35:1, main motor 120HP, back drive motor 60HP, proper chemicals should be added to separate ultra fine solids from the waste water. The bowl length/ diameter is 4.1, the material can stay in the screw for longer time to improve the separation efficiency.
The end user plan to use imported decanter centrifuge originally, after study GN decanter centrifuge features, international case study and production facility, they decided to use GN big bowl decanter centrifuge for convenient parts supply, after sales service, good performance and competitive price.
For more information, pls contact with GN sales engineer, we will make customized design decanter centrifuge solution for your requirement.

GN decanter centrifuge has worked successfully for power plant waste water treatment in Taiwan, China. The project configuration is as below:
1) Total equipments: 5 sets of GNLW454E decanter centrifuge


2) Material to be treated: power plant waste water
3) Target: Discharge sludge with water content below 75%.
4) Main concern: the solids content is very low, and much ultra fine solids, and the waste water is highly corrosive chemical water.


GNLW454E decanter centrifuge is special designed for waste water treatment, according to the samples we received from the customer, we had designed special bowl angle, pond depth, and bowl major materials for better corrosion resistance for the chemical waste water, normally our standard bowl material is duplex stainless steel 2205 or 2304, for this project, we use duplex stainless steel 2507 for better corrosion resistance.The basic technical specification is as below:
Bowl diameter: 450mm (18 inch), bowl length 1890mm (74.5 inch), the length/diameter ratio is 4.2, the max bowl speed is 4000rpm with max G force 4032G, the main motor is 45KW, the back drive motor is 11KW.
Below is the photo to show the discharged solids from our decanter centrifuge, the customer is satisfied with the treatment result.
Below is the photo to show the feed in waste water and after treatment clean water.


For the 18 inch bowl decanter centrifuge, we also have other models for different applications, such as GNLW453C-VFD can be used for oil & gas drilling solids control system and drilling waste management system, it can be also used as dewatering centrifuge with chemical dosing system. GNLW452D decanter centrifuge is middle speed decanter centrifuge, it can be used for barite recovery in the solids control system, it can be also used for construction tailing slurry treatment.
If you need a decanter centrifuge solution, pls contact with GN solids control.

GN solids control welcome our clients to take the sample materials to our facility to test by our decanter centrifuge, this is to let the client to know exactly the separation result clearly, and the operation method communication, this is a good way for the client to “watch the factory and watch the testing” before order.


GNLW224D mini decanter centrifuge is widely used to treat mining waste water recovery, industry waste water treatment, chemical slurry separation, animal waste separation, etc. projects. It is a single motor decanter centrifuge with VFD control panel, we can control the flow rate of the Netzsch brand screw pump by adjust the frequency of the motor, and set different differential speed to treat different fluids. The smaller of the differential speed, the drier of the discharged solids, the more clear of the discharged water. When increased the feeding flow rate, the discharged water might be less clear, the solids moisture is also increased. The max speed is 4500rpm, typical speed is 3800 rpm and the max G force is 2492G.


GNLW224EP-VFD is much better to treat the industry waste water, it is a 2 motor decanter centrifuge with main motor and back drive motor with VFD control panel. The smallest differential speed can be adjusted to 1 rpm, this can promise the discharged water very clear to meet the client’s requirement, and the solids moisture can also meet the limit. The max speed is 5000rpm, typical speed is 0~4500 rpm and the max G force is 3077G. The high G force ensures the better separation of the fine solids.

This week GN shipped several units of waste water treatment decanter centrifuge to Russia, The model is GNLW363C-VFD, This is one of the most popular model decanter centrifuge among GN equipments, it can be applied for many industries including waste water treatment, drilling fluids recycling/ cleaning, dewatering unit, drilling waste management system, dredging slurry separation system, industrial waste water treatment and all the other liquid solids separation application.


There are many size decanter centrifuge for option, 9 inch, 14 inch, 18 inch, 22 inch, 30 inch with different treating capacity, the treating capacity for different material varies a lot for the same bowl size. For the same bowl size, we have different ratio when used for different industry, for example, 9 inch bowl centrifuge have models of GNLW223 and GNLW224, GNLW224 with longer bowl length, the ratio is 4, with better performance in separation, discharge fluids is more clear, the discharged solids is drier, it is an ideal decanter for the dewatering fluids, when the client need to get pure water to send to waste water treatment plant or drain off to the river/ pond.


The 14 inch bowl also have GNLW363 and GNLW364, The 18 inch bowl also have GNLW452, GNLW453-VFD, GNLW454-VFD for option, the 22 inch bowl also have GNLW553-VFD, GNLW554-VFD.