Water base drilling mud is one of the most popular drilling mud in oil and gas drilling field. Compared with oil base drilling mud and synthetic base drilling mud, water base mud have a lower pollution on environment, it is relatively lower cost, and easier to generate the drilling waste.
Draftly speaking, there mainly 2 kinds of system will be used to water based mud in oil and gas drilling field: mud Solids control system and drilling waste management system.  
 
Solids control equipment for water base drilling mud management system
1) The first stage solids control equipment shale shaker, recommend model GNZS549E
2) The second and third stage solids control equipment mud cleaner. It is a combination of desilter, desander and under flow shale shaker for compact design. Customer can choose different model mud cleaner per drilling capacity request. Sometimes per different jobsite request, customer can even choose separate desilter, desander with or without underflow shale shaker.
3) The fourth stage solids control equipment decanter centrifuge. In this stage, the jobsite normally use lower speed 1800~2200rpm for barite recovery, and/or a high speed centrifuge for fine solids control.

Drilling cuttings treatment system for water based mud
1) High G dryer shale shaker, model GNZS594HGE. It is a four-panel shale shaker with the same replacement shaker screen with Swaco Mongoose shaker.
2) Decanter centrifuge high speed for drilling waste management, with a telescopic skid underneath
3) Screw conveyer to transfer drilling cuttings

In some cases, if there are too much fine solids in the fluids phase from drilling waste centrifuge, and it cannot be separated by decanter any more, dewater unit will be used.
Dewatering unit with dewatering centrifuge is a normally used for water base mud drilling cuttings treatment. It is used to supply chemicals to polymerize the fine solids into bigger size that centrifuge can separate.
After solids control separate, drilling waste separate, and/or dewatering treatment, the clean fluids can be transferred to mud tank system for drilling. Or if there is no drilling activity, the fluids can be transferred direct to slurry separation company for waste water treatment.