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Apparatus and a process for use in aeration of a fluid. The apparatus includes a tubular drive shaft having a first end and a second end. The first end is coupled to a selectively rotatable power source. A compressed air source is in fluid communication with the tubular drive shaft. A first propelle

Apparatus and a process for use in aeration of a fluid. The apparatus includes a tubular drive shaft having a first end and a second end. The first end is coupled to a selectively rotatable power source. A compressed air source is in fluid communication with the tubular drive shaft. A first propeller having a propeller shaft is coupled to the second end of the tubular drive shaft. An atomizing mechanism is located proximate the propeller shaft. The apparatus may further include a second propeller having a propeller shaft positioned between the first propeller and the second end of the tubular drive shaft. In another mode of operation, the aerator may be used solely as a mixer in an nitrification/de-nitrification process without the introduction of outside air or compressed air.

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[ What is claimed is:] [1.] A method of treating waste water, comprising the steps of:providing an aerator/mixer including an elongate drive shaft having a first end a second end, the first end being coupled to a selectively rotatable power source, a compressed air source in fluid communication with

[ What is claimed is:] [1.] A method of treating waste water, comprising the steps of:providing an aerator/mixer including an elongate drive shaft having a first end a second end, the first end being coupled to a selectively rotatable power source, a compressed air source in fluid communication with a tubular shaft; a first propeller coupled to the drive shaft proximate the drive shaft second end; a second propeller, larger than the first propeller, coupled to the drive shaft between the first propeller and the first end of the drive shaft;submerging the second end of the drive shaft and the propellers in waste water;delivering air to the second end of the drive shaft from the compressed air source when the propellers are rotating to aerate the waste water; andreducing the delivery of air to the second end of the drive shaft from the compressed air source when the propellers are rotating to mix the waste water.