NOVELTY - A packaged modular biological fluidized bed reactor, comprises a grinding disintegrator (2) to grind organic biodegradable impurities in wastewater (1); a head suppression chamber (3); a grit removal chamber (4) that receives wastewater with ground particles; a container (13) placed to receive ground particles; a split chamber that receives the wastewater from which the ground particles have been removed; and an aeration tank-clarifier for receiving blown air which provides a zone for hydraulic recirculation.    USE - As a packaged modular biological fluidized bed reactor for continuously reducing organic biodegradable impurities in wastewater, such as domestic solid wastes, livestock products, synthetic plastic materials, wood, carpeting materials, paper, cardboard, fish processing wastes, and canning wastes.    ADVANTAGE - The bed reactor cost-effectively and efficiently provides combined unit that maximizes the mixed liquor suspended solids (MLSS) in the activated sludge return flow, thus minimizing the intensity of aeration necessary to provide recirculation between the aeration and phase clarification zones. The arrangement of the modular treatment unit contributes to the construction units being readily suitable for prefabrication, thereby reducing construction time and start-up preparation. The treatment process technology does not include anaerobic processes, thereby avoiding odors and other adverse environmental impacts. This reduces sanitary control areas, and land requirements. The reactor provides a continuous process in a form of a packaged modular type unit for conducting biological wastewater treatment. The fluidized bed reactor with appropriate hydraulic conditions for aeration provides formation of a fluidized bed, liquid mass recirculation between all hydraulic zones and thereby efficiently maintaining a high reaction mass concentration within the reaction volumes. The reactor provide a high concentration of activated sludge in the sludge thickening bottom compartment prior its return to the aeration zone using recirculation flow directing tubes providing suction and high MLSS inflow from the sludge separation zone thus decreasing energy consumption for aeration. The disintegrator has few working parts, by low pressure drop, and by high reliability of operation. The machine uses low velocities of the moving cutting elements at high twisting moment which provides high efficiency of grinding the particles of impurities and leaving the ground small size particles within the wastewater flow. High efficiency of grinding results in a very high surface area of the ground suspended solids having a particle size of less than or equal to 6 mm. The structure of the spherical rotating cutting element with an open center provides a high degree of the use of cutting element surface area and low hydraulic resistance for the apparatus. The disintegrator provides efficient grinding of coarse particles typically found in communal wastewater, such as domestic solid wastes.    DETAILED DESCRIPTION - A packaged modular biological fluidized bed reactor for continuously reducing organic biodegradable impurities in wastewater (1), comprises an inlet pipe to introduce the wastewater into the modular biological fluidized bed reactor; a grinding disintegrator (2) to grind the organic biodegradable impurities to a particle size of up to 6 mm; a head suppression chamber (3) for receiving and conveying the wastewater with the ground particles; a tangential grit removal chamber (4) that receives wastewater with the ground particles, and having a conical bottom, where the ground particles settle; a container (13) placed below the tangential chamber to receive the ground particles from the conical bottom of the tangential chamber; a split chamber that receives the wastewater from which the ground particles have been removed; an aeration tank-clarifier capable of receiving blown air which provides a zone for hydraulic recirculation provided by oxygen supplied from an air blower and disinfectant is supplied from a unit outside of the aeration tank-clarifier, where remaining organic impurities in the wastewater are biochemically oxidized and disinfected and the wastewater and an activated sludge is separated from the clarified effluent of the wastewater in a fluidized bed. The reactor further comprises a sludge thickener (9) to receive the sludge formed in the aeration tank-clarifier; a pumping unit (15) to pump the activated sludge into a dewatering unit present to remove the activated sludge from the pumping unit and separate the activated sludge from a supernatant to permit the supernatant to be pumped back to the split chamber for further removal of remaining biodegradable impurities; and several aeration-tank-clarifiers. The reactor is cylindrical, rectangular or polygonal in shape. The supernatant is obtained from the sludge and the supernatant is recirculated into the aeration zone for further removal of biological impurities. An INDEPENDENT CLAIM is included for removing biological impurities from wastewater involving grinding impurity particles in the wastewater to a particle size of less than approximately 6 mm; separating the ground particles from remaining wastewater; introducing the remaining wastewater into an aeration tank-clarifying zone with introduction of air and disinfectant to hydraulically circulate and recirculate, biologically oxidize and disinfect the contents of the zone, to clarify wastewater in a clarification zone and to separate effluent of the clarified effluent from sludge.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view of the packaged modular biological fluidized bed reactor for continuously reducing organic biodegradable impurities in wastewater.    Wastewater (1)    Grinding disintegrator (2)    Head suppression chamber (3)    Grit removal chamber (4)    Sludge thicker (9)    Container (13)    Pumping unit (15)