| abstract |
The objective of the present invention is to provide a suspensoid removal method and suspensoid removal device with which a filtrate satisfying a water quality standard can be obtained at low cost without requiring sludge treatment equipment. This suspensoid removal method comprises: a step in which a protrusion element is supplied to a filtration layer (2a) formed by being filled with a solid filtration material, and a protrusion is imparted to the surface of the solid filtration material; a step in which, after the protrusion element is supplied in the step for imparting a protrusion, it is determined, on the basis of a standard set in advance, whether or not a protrusion has been imparted to the surface of the solid filtration material, and, if it is determined that such a protrusion has been imparted, the supply amount of the protrusion element is reduced further than during the imparting of the protrusion; a step in which a biofilm is formed on the surface of the solid filtration material; and a step in which, with the protrusion element supply amount reduced, water to be treated that includes a suspensoid is passed through the filtration layer (2a) which has the solid filtration material to which the protrusion has been imparted. |