AERATOR OUTFITTED WITH A HYDRAULIC POWER GENERATOR

PROBLEM TO BE SOLVED: To enhance the total energy efficiency based on a power generation scheme of blasting air via an air blast means having a favorable total energy efficiency without using an air blast means such as a blower, etc. as an air feeding means of feeding dissolved oxygen into water.SOLUTION: The aerator provides a spiral water wheel hydraulic power generator 11 which comprises a pump 3 for pumping, as pressurized water, an effluent within an aeration tank 1, an ejector 4 for suctioning atmospheric air via an air introduction tube 6 based on the negative pressure spontaneous suction function of the pressurized water, and a diffuser 7 having a flaring structure linked and connected to the ejection side of the ejector 4 and being installed vertically in a state where the discharge port 7a of the diffuser 7 is being linked and connected to an air-water separation metering tank 9 configured at a low drop position approximately 2 to 7 m above the water surface so as to rotate and drive a spiral water wheel 16 configured at the drop formation site of the air-water separation metering tank 9 and to generate a power from a power generator 18 linked, via an acceleration means, to a linkage means rotatably in accordance with the rotation of the spiral water wheel 16, and in the aerator treatment target water is discharged into the water surface of the aeration tank 1 and then circulated.