waste water treatment

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.