Sand-manure liquid separation plant, a use of the plant, and a method of using the plant

A sand-manure liquid separation plant comprising:

• a tank containing a mixture of sand and manure liquid to be processed in the tank, the tank comprising:
• a top portion comprising a mixture inlet for filling the mixture of sand and manure liquid to be processed into the tank;
• and a bottom portion comprising a sand discharge that discharges sand settled in the bottom portion wherein the sand discharge communicates with an upwardly extending screw conveyor configured to discharge sand away from the sand-manure liquid separation plant;
• wherein a maximum level (ML) of filling of the mixture of sand and manure liquid is defined within the tank;
• and wherein the mixture inlet is arranged at a level (L) above the maximum level (ML) of filling;
• a number of fluid outlet(s) connectable to a source of a fluid and arranged above the maximum level (ML) of filling, the number of fluid outlet(s) being configured to provide a flow of the fluid directed towards the maximum level (ML), below the mixture inlet;
• and a pre-separator that receives a raw stream of sand mixed with manure liquid, the pre-separator comprising a cyclone, wherein an outlet portion of the cyclone at a bottom part of the cyclone is arranged at the top portion of the tank contains the mixture of sand and manure liquid to be processed in the tank to flow into the tank by gravity via the outlet portion and the mixture inlet, wherein the bottom portion further comprises a water inlet arrangement with a number of water inlets for supplying water under pressure to the tank, wherein the water inlets are configured for providing an upward flow of the supplied water within the tank towards the maximum level (ML).