| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for aerobic treatment of waste water so that the water can be efficiently treated at a low cost by using a carrier the preparation of which is free of cost or causes no problems of disposal and on which a microbial film is fast formed. SOLUTION: Granule sludge 2 discharged from the reactor by the UASB(upflow anaerobic sludge blanket) method is introduced as a carrier into an aeration tank 1 to form an aerobic microbial film on the surface of the granule sludge 2. Then raw water is introduced from a raw water passage 4 into the aeration tank 1 and mixed with the granule sludge 2, returned sludge from a sludge returning passage 7, and floating active sludge in the aeration tank 1. The mixture is aerated by supplying air from an air supply passage 5 and diffusing air from a diffusing device 6 to carry out the aerobic treatment. The mixture liquid in the aeration tank 1 is partly discharged and introduced into a settling tank 3 to separate the solid from the liquid. The separated liquid is discharged as treated water from a treated water passage 9 while the separated sludge is returned as the returned sludge through the sludge returning passage 7 to the aeration tank 1.</p> |
