INTEGRATED SEWAGE TREATMENT TANK EMPLOYING BIOLOGICAL DOUBLE-EFFICIENCY PROCESS AND FLUIDIZED BED PROCESS

摘要

Disclosed is an integrated sewage treatment tank employing the Biological Double-efficiency Process and a fluidized bed process. The tank comprises a tank body and separation plates disposed inside the tank body, the separation plates successively dividing the tank body into an anaerobic zone, an anoxic zone, an aerobic zone, and a precipitation zone. The separation plates have water holes. The tank body has a water inlet and a water outlet. The aerobic zone is connected to the anaerobic zone via a sludge reflux pipe for performing reflux to the anaerobic zone. The tank is characterized in that an inclined tube is disposed in the precipitation zone, the inclined tube having an upper layer and a lower layer, and the diameter of the lower-layer inclined tube being larger than that of the upper-layer inclined tube. A filler is disposed in the anaerobic zone, the anoxic zone and the aerobic zone. In the present invention, the Biological Double-efficiency Process and a fluidized bed process are organically combined, which achieves high efficiency and stability, favorable sewage treatment, and a small area. Moreover, a principle of "shallow precipitation" is employed, which shortens the distance along which particles precipitate, thus reducing the time for precipitation, and increasing the precipitation area in a precipitation pool, thereby increasing processing efficiency. The diameter of the lower-layer inclined tube is larger than that of the upper-layer inclined tube, which provides a better processing effect.