TM 5-814-3/AFM 88-11, Volume III
(2) Induction aerator. This type of aerator, which is available in various sizes, draws the mixed liquor
and air down a U-tube and discharges it for a distance downstream in the channel. Compressed air at low
pressure can be injected near the top of the down-draft tube to enhance oxygenation. A bulkhead (which
should be partially opened at the bottom) is required to separate the channel to maintain the flow circulation.
This type of aerator is suitable for shallow to moderately deep channels.
(3) Jet aeration. Jet aeration is specifically designed for deep channels. Both air and the mixed liquor
are pressurized (by aspirator pumping) into a mixing chamber from where the mixture is discharged as a jet
stream into the surrounding channel liquid. Deep channels are used to take advantage of better oxygen
transfer. Figure 13-7 illustrates a jet aerator, among various other types of aerators.