Shale shaker can be utilized in 2 ways for the rig.
1st utilization is for rig solids control system as the first separation equipments, by this way, some of the cuttings with drilling fluids will be separated out. 
2nd utilization is for drilling cuttings separation, they use fine mesh screen to dry the drilling cuttings and separate usable drilling fluids and back to the rig. The drilling cutting shaker also called hi-G shaker.To continue drying the cuttings, you should use cutting dryer.