Separation apparatus

A separation apparatus which separates a substance included in a liquid and having a specific gravity less than a specific gravity of the liquid, the separation apparatus comprising:

• a separation tank;
• a partitioning member which is disposed in an inside of the separation tank, includes an erect portion having a height lower than a height of each of side walls of the separation tank and a transverse portion disposed between the erect portion and the side walls of the separation tank, and partitions the inside of the separation tank into an inflow region and an outflow region of the liquid;
• an inlet which is opened in the inflow region, of which a lower level is set to be lower than an upper end of the erect portion of the partitioning member and an upper level is set to be higher than the upper end, and through which the liquid flows into the inflow region;
• a screen which is disposed in the erect portion along a flow direction of the liquid flowing into the inflow region in the partitioning member and through which the liquid passes from the inflow region to the outflow region;
• a swirling inducing member which is disposed in the erect portion intersecting with the flow direction of the liquid flowing into the inflow region in the partitioning member and induces the liquid to swirl;
• a screen which is disposed in the transverse portion in the partitioning member and through which the liquid passes from the inflow region to the outflow region;
• a dividing member which is disposed opposite to the inlet and divides the liquid flowing in from the inlet into flows along the side walls of the separation tank;
• a retaining member which is disposed at a downstream side in the flow direction of the liquid divided by the dividing member and retains the substance included in the liquid and having the specific gravity less than the specific gravity of the liquid;
• and
• an outlet which is opened in the outflow region and through which the liquid flows out from the outflow region.