A waste treatment facility suitable for being installed in vicinity of a cement production facility, comprising: a fluidized bed type gasification furnace configured to gasify wastes to generate pyrolysis gas; a gas transport path suitable for transporting the pyrolysis gas generated in said gasification furnace to a preheater or a calciner for cement in said cement production facility; an air feeding path configured to feed fluidizing air to a fluidized bed of said gasification furnace; a damper and a blower provided in said air feeding path; a temperature elevating device configured to elevate the temperature of fluidizing air to be supplied to said gasification furnace by utilizing waste heat of said cement production facility; a supplying device (4, 81) configured to supply a dewatered sludge which is contained in said wastes and other wastes separately to said gasification furnace; and a temperature sensor for measuring a temperature of said fluidized bed; and a controller, configured to receive a signal from the temperature sensor, characterized in that the pyrolysis gas is containing entrained char and ash, said supplying device (4, 81) is configured to supply the dewatered sludge to a fluidized bed in said gasification furnace from multiple dispersed locations of the upper side thereof, said controller controls: a level of opening of a damper and a rotating speed of said blower to adjust a flow rate of fluidizing air within predetermined rate; and an opening of a bypass valve to adjust a flow rate of fluidizing air for creating bypass said temperature elevating device to adjust a temperature of fluidizing air and said supplying device (4,81) to adjust an input amount of at least one of said dewatered sludge and other wastes so that the temperature of said fluidized bed measured by said temperature sensor may be maintained within a range from 500 to 600°·C. a fluidized bed type gasification furnace configured to gasify wastes to generate pyrolysis gas; a gas transport path suitable for transporting the pyrolysis gas generated in said gasification furnace to a preheater or a calciner for cement in said cement production facility; an air feeding path configured to feed fluidizing air to a fluidized bed of said gasification furnace; a damper and a blower provided in said air feeding path; a temperature elevating device configured to elevate the temperature of fluidizing air to be supplied to said gasification furnace by utilizing waste heat of said cement production facility; a supplying device (4, 81) configured to supply a dewatered sludge which is contained in said wastes and other wastes separately to said gasification furnace; and a temperature sensor for measuring a temperature of said fluidized bed; and a controller, configured to receive a signal from the temperature sensor, characterized in that the pyrolysis gas is containing entrained char and ash, said supplying device (4, 81) is configured to supply the dewatered sludge to a fluidized bed in said gasification furnace from multiple dispersed locations of the upper side thereof, said controller controls: a level of opening of a damper and a rotating speed of said blower to adjust a flow rate of fluidizing air within predetermined rate; and an opening of a bypass valve to adjust a flow rate of fluidizing air for creating bypass said temperature elevating device to adjust a temperature of fluidizing air and said supplying device (4,81) to adjust an input amount of at least one of said dewatered sludge and other wastes so that the temperature of said fluidized bed measured by said temperature sensor may be maintained within a range from 500 to 600°·C. a level of opening of a damper and a rotating speed of said blower to adjust a flow rate of fluidizing air within predetermined rate; and an opening of a bypass valve to adjust a flow rate of fluidizing air for creating bypass said temperature elevating device to adjust a temperature of fluidizing air and said supplying device (4,81) to adjust an input amount of at least one of said dewatered sludge and other wastes so that the temperature of said fluidized bed measured by said temperature sensor may be maintained within a range from 500 to 600°·C.