| 摘要 |
<p>PURPOSE:To make it possible to make facility volume compact and to execute purification with high efficiency by adopting a biological membrane method which is one of water purifying methods and executing reflux of water in a tank. CONSTITUTION:A broad first flow passage 4 and a narrow second flow passage 5 are formed in a box shaped tank body A by delineating the spacing between a first water tank part 1 and a second water tank part 2 to about 2:1 in a transverse direction by allowing the first water tank part 1 to remain at one longitudinal end of the tank body and the second water tank part 2 to remain at the other end. Microorganism contact materials 11 are mounted at the first flow passage 4 and the second flow passage 5. An inflow section 6 for polluted water and a release section 7 for purified water are both formed in the first water tank part 1 and in the second water tank part 2. The tank 19 further provided with reflux means 8, 9 for forcibly returning the water from the downstream end of the first flow passage 4 of the second water tank part to the upstream end of the second flow passage 5 of the first water tank part 1 and is provided with baffle plates 10 and aeration means 13, 14.</p> |
