dewatering unit

Drilling waste decanter centrifuge can be used together with Chemical enhance dewatering unit. We call it dewatering unit. The total system is normally put in a 20ft container or a 40ft container, per customers’ request.

Chemical enhance dewatering unit, frankly speaking, it is a mixing system for chemicals. Chemical can be mixing and storage in the system per the set conditions. And then the qualified chemicals can be transferred to decanter centrifuge feeding pipe and mixed with mud before center into centrifuge for treatment.

Some customer is wondering: the decanter centrifuge is used to separate the fine solids from drilling mud, why chemical enhance dewatering unit is need together? And in which condition, the chemical enhance dewatering unit is needed?
The reason is that, decanter centrifuge is a kind of physical separation. It applies high G force and the differential speed to separate fine solids above 2 ~ 5 microns from drilling mud. For the even more fine solids smaller than 2 ~ 5 microns, decanter centrifuge is not worktable. They will be left in the fluids after separation. If customer want to separate this part of the ultra fine solids and get more pure water, chemical treatment is requested.    
The function of the chemical enhance is to make the fine solids in a bigger size, in this case, decanter centrifuge can treat it.

Then customer have another question, how they get the chemicals? How should they know which kind of chemicals should be add? How much should be add? How long time should be wait? How long time for mixing with drilling mud? If they buy centrifuge dewatering unit from GN Solids Control, can GN company offer chemicals to them? …
Answers as below: The centrifuge manufacturer or dewatering unit manufacturer, they normally only make the machine, they do not supplier chemicals. There are chemical company for all the jobs. What you should do then is to find a reliable chemical supplier, send them samples of your materials, and tell them result you want to get, the chemical engineer will test and offer you the suitable chemicals and instruct you how to use it.

Applications of dewatering unit
1) Dewatering unit is an important part for waste water treatment.
2) Combined with high speed or super high speed decanter centrifuge, dewatering unit is widely used for water base mud drilling cuttings treatment.
3) Dewatering unit can be used in TBM (Tunnel Boring Machine) drilling mud system
4) Dewatering unit can be used in dredging slurry separation system in civil projects. In this case, it is used together with belt compressor.

Flocculants is the most important part to effect dewatering unit performance. In order to insure a better performance of dewatering unit, we should pay attention on below points:
(1) If the surface of the flocculants powder is dissolved too rapidly, there will be particle mutually attached, therefore it will cause the particle interior does not be dissolved completely; the usual operation is to use various types of dispersing and dissolving device.
(2) Per different conditions, the time used to dissolve the flocculants varies. The main factors may as below:
A. The types of flocculants be used;
B. The water quality used as dissolution;
C. The temperature of water
D. The mixing efficiency.
Normally, its takes around 1hour for flocculants powder to be fully dissolved. If the flocculants cannot be mixing completely, it will reduce the performance.

Dewatering unit Design in drilling waste management field
Dewatering unit is usually put into container. GN Solids Control company offers 20ft containerized dewatering unit and 40ft containerized dewatering unit.
Dewater centrifuge for dewatering unit can be put into the container, inside the container or even on the top of container.

When dewatering unit is used together with decanter centrifuge. It should pay attention to that: the chemicals should add on centrifuge feeding pump outlet pipe, and before enter into centrifuge. The mud cannot be mixed with chemicals and then transfer to centrifuge. Pls refer our former mail for dewatering unit pipeline.

What is dewatering unit
Dewatering unit is a mixing system to mixing chemicals and drilling mud for floculation. After floculation, the very find solids will be formed into bigger size, and suitable for decanter centrifuge treatment.
For easy understanding, we can see that, it is similar like put orange juice into a cup of milk.  It is milk whilte originally, after mixed with juice, immediately, the milk is separated into floccus and pure-like water.

Sizes of dewatering unit
Dewatering unit is noramally put into container, there are 20ft containerized and 40ft containerized. Per different customers request, there are different design for the dewatering unit itself. There are 2-chamber dewatering unit and 3-chamberdewatering unit. And per defferent request, it can mixing chemicals from 1 ~ 3 kinds.

Dewatering cantrifuge for dewatering unit
Decanter centrifuge is normally used in dewatering unit. Per the jobsite footprint, the decanter centrifuge have 3 kinds of connections with dewatering unit:
1) The decantering centrifuge can put into container, connected with dewatering unit
2) The decantering centrifuge can put on the top of container, connected to dewatering unit
3) The decantering centrifuge can put outside container, connected with dewatering unit

How to order a suitable side dewatering unit?

If you want customized dewatering unit, you’d better try to answer below questions:
1) 2 chambers or 3 chambers request: 3 chamber is more widely used. 2 Chamber cannot continue mixing.
2) The chemical preparing speed (Liters/Hr): 1500liters/hr is a normal speed, customer can request customized mixing speed
3) Density of chemicals, in order to make sure the hopper size
4) Chamber capacity (if there is)
5) Other special request (if there is)

Centrifuge dewatering unit is a kind of equipment for biosolids management to thickening and flocculation of very fine solids on drilling fluids.

Thickening and dewatering are important components of biosolids management programs. The proper solids concentration is critical in stabilization processes from aerobic digestion to advanced alkaline stabilization. The recent advances in solids thickening and dewatering have increased performance and capture rates while often reducing chemical and polymer consumption, electrical usage, space requirements and odor potential. In addition, automation has reduced the degree of operator attention required, further reducing the cost of operation.