| 摘要 |
<p>PURPOSE: To eliminate the abrasion of a carrier suspended in wastewater in a tank and the peeling of microorganisms from the carrier and to agitate the wastewater uniformly by installing paddle blades having a specified diameter and a specified rotational frequency in a treatment tank into which soft microorganism supports is charged. CONSTITUTION: In a biological treatment tank, paddle blades 114q, 114b are installed in two places respectively in the upper part and the lower part of a rotary shaft 112 which is hung into a treatment tank 110, and they are rotated by a motor 116 through the rotary shaft 112. In this way, the treatment tank 110 is agitated, and wastewater 126 is contacted with sponge cubes 128 as a carrier on which microorganisms are propagated and held to be purified. The diameter W1 of the paddle blades 114a, 114b is made to be 1/2-4/5 of the inner width W2 of the treatment tank 110. In addition, by adjusting the rotational frequency of the paddle blades 114a, 114b at 5-15rpm, good agitation is obtained and the undesirable effect on the sponge cubes is prevented.</p> |
