| 摘要 |
<p>PURPOSE:To enhance the effect of biological treatment and to improve the efficiency of purifying waste water, by providing a packed layer formed by uniformly mixing solid particles having a particle size of 0.2-10mm. and a filler larger than the particles and a supporting layer for the packed layer inside a purifying cell. CONSTITUTION:Waste water containing BOD components, nitrogen components, etc. is let flow from raw water piping 2 into a purifying cell 1, while air is fed from piping 7 through a water-collecting air-introducing means 5 into the cell 1 to maintain a packed layer 3 in an aerobic atmosphere. While the waste water passes through the packed layer 3, BOD components, etc. in the waste water adhere to and grow on the surface of the filler to form biomembranes of aerobes such as BOD component-decomposing bacteria and nitrifying bacteria. Consequently, BOD components, etc. in the waste water successively flowing downwards through the packed layer 3 are decomposed and removed by the action of the aerobic biomembranes. Ammoniac nitrogen and organic nitrogen are oxidized into NO3-N and NO2-N, while purified water is withdrawn through the water- collecting means 5 and a draining opening 15.</p> |
