| 摘要 |
PURPOSE: A diffuser including an air dispersion device of a funnel shape is provided to increase durability without closing the diffuser by the adulteration and bio-filter and maintain high oxygen transfer rate due to easily removing the adulteration for increasing the dissolved oxygen. CONSTITUTION: A diffuser includes a body(1) in which the air is flowed in the inside, an opening is included so that inside and outside of the body be communicated with the body. The other acid group towards the outer surface of the body the air accepted to the body comprises the air dispersion device of the funnel shape. In the inside of the body, the granule contraction tube shape funnel shape in which opening is gradually reduced is had. The enlargement type funnel shape in which opening is gradually expanded as it faces from the inside of the body to outside. The conical shape funnel shape in which the cross section of opening is parabola. |
