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Mud tank is used for storage, mixing the drilling mud in a drilling mud recycling system, there are various types mud tanks, the normal shape is square mud tank. After a long period drilling operation, there will be some sludge with oil and solids accumulated in the bottom of the mud tank. Cleaning the mud tank become a big problem, the round bottom tank is better compared with the square bottom tank, but it can not avoid the problem completely. To reduce the accumulated sludge in the bottom tank as less as possible, there are 2 ways:
1 choose suitable mud agitator and mud gun for better mixing, so it can circulate in the whole system. 
2 use mud tank cleaning equipments. It depends on the solids size in the bottom, firstly you can use a sieve or a shale shaker to separate the large particles, then use the decanter centrifuge to separate the fine particles, the separated solids is dry enough to throw away, the recycled fluids can be re-used to prepare for new drilling fluids. If you do not need to re-use it, you can get it into waste water treatment plant for cleaning.