| 摘要 |
<p>PURPOSE:To efficiently perform the circulation and oxygen supply in a water area by providing an aerator simultaneously performing aeration and stirring to a polluted water area at a predetermined position and providing a draft tube having predetermined length extending in a vertical direction to the aerator on the suction side thereof. CONSTITUTION:Water is sucked from the water area bottom tank part of the lower end of a draft tube 3 by the negative pressure generated at the leading end of a screw 23 by the operation of an aerator 2 to rise through the tube 3 and again discharged to a water area in the direction of the aerator by the screw 3 through a casing. At this time, air is sucked through a hollow shaft 22 by the negative pressure in the water and discharged toward the leading end of the screw as fine air bubbles while mixed with sewage. As a result, the sewage of the bottom layer in the water area is pumped up through the draft tube 3 and discharged laterally to generate a circulating water area and the stirring and aeration of the sewage of the whole of the water area are simultaneously performed and the sewage is purified.</p> |
