FLUIDIZED BED FILTER

PROBLEM TO BE SOLVED: To provide a fluidized bed filter in which filtration capacity is raised to the filtration capacity corresponding to at least the quantity of packed filtering medium by restoring filtration capacity of the filter while performing filtration. SOLUTION: To fluidized bed filter is equipped with a housing 1 constituting of a closed vessel, a first filtration part 2, a liquid supply nozzle 4 and a liquid discharge part 5. The first filtration part 2 is provided within the housing and formed into a shape projected below. The liquid supply nozzle 4 is arranged within the housing of the underside from the first filtration part and sprays liquid 3 containing material to be filtrated against the first filtration part 2. The liquid discharge part 5 is arranged to the top of the housing 1 and discharges the filtrate of material to be filtrated. Porous light spherical materials 12 are enclosed into the housing 1 of the upside of the first filtration part 2 and floated by liquid ascending in the housing or fluidized on the first filtration part or a part thereof is floated and fluidized. Liquid passed through the first filtration part to be partially filtrated is furthermore filtrated by the spherical materials 12.