Process for treatment of wastewater with a modular biological fluidized bed reactor system

Abstract

A biological wastewater treatment process and modular apparatus wherein activated sludge is recirculated in all of aeration, fluidized bed and return sludge phases in the apparatus.

1 - 14 . (canceled) 
     
     
         15 . The method according to  claim 18 , wherein the recirculation flow velocity in the aeration tank clarifying zone is in the range of approximately 0.5-5.0 cm/sec. 
     
     
         16 . The method according to  claim 18 , wherein said recirculation flow is directed by a plurality of recirculation flow directional tubes installed between said aeration zone and said clarification zone. 
     
     
         17 . The method according to  claim 18 , wherein supernatant is obtained from said sludge and said supernatant is recirculated into said aeration zone for further removal of said biological impurities. 
     
     
         18 . A method for removing biological impurities from wastewater in a biological fluidized bed reactor system comprising:
 a. Introducing said wastewater into said modular biological fluidized bed system through an inlet pipe,   b. grinding particles of said biological impurities in said wastewater with a high efficiency grinding disintegrator,   c. receiving said wastewater with the ground particles in a tangential grit removal chamber having a conical bottom, thereby permitting said ground particles to settle and be separated from the remaining wastewater,   d. introducing said remaining wastewater into an aeration tank-clarifying zone together with air to provide oxygen supplied by an air blower and disinfectant supplied from a unit outside of said aeration tank clarifier, thereby oxidizing and disinfecting remaining organic impurities in said wastewater, with activated sludge being separated from the clarified effluent of said wastewater in said fluidized bed,   
       wherein said oxygen provided by said air blower flows along a system of baffles and recirculation tubes is sucked into the upper ends of said recirculation tubes to enhance air flow in said aeration tank-clarifier when said air flow exits from the lower ends of said recirculation tubes, resulting in aeration, formation of a fluidized bed and liquid mass recirculation flow between all hydraulic circulation zones in said aeration tank-clarifier. 
     
     
         19 . The method according to  claim 18  wherein said particles containing impurities are ground to a particle size of 6 mm or less. 
     
     
         20 . The method according to  claim 18  wherein said aeration tank-clarifier is of cylindrical, rectangular or polygonal in shape. 
     
     
         21 . The method according to  claim 18  wherein from four (4) to six (6) aeration tank-clarifiers are present and a split chamber provides distribution of said wastewater between them. 
     
     
         22 . The method according to  claim 18  wherein a container said ground particles are received into a container placed below said tangential grit removal chamber. 
     
     
         23 . The method according to  claim 18  wherein fluid communication with said grinding disintegrator is provided by means of a head suppression chamber.