Aeration device, a use thereof, and water purification installation with such an aeration device

An aerator for aerating water that comprises a distribution system for distributing air below a water surface and a compressor with an air inlet and at least one air outlet, whereby the compressor is configured to be placed below the water surface in that the compressor is provided with a housing configured to prevent an infiltration of the water into the compressor, whereby the infiltration of the water at the air inlet is prevented by an intake pipe being provided of which a first open end is above the water surface and a second open end has a watertight connection to the compressor, whereby the infiltration of the water at the at least one air outlet is prevented by the distribution system having a watertight connection to the at least one air outlet and, due to the watertight connection of the distribution system or by having at least one valve, the housing is closed to hold back the water and whereby the housing is in thermal contact with the water to cool the compressor, wherein the compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that is mounted on air bearings, magnetic bearings or both,

• wherein the compressor and the distribution system are arranged so that the compressor and the distribution system are configured to rotate around a vertical axis, and
• wherein the aerator rests on a turntable that is configured to rest on the bottom of a reservoir in which the water is located.

An aerator for aerating water that comprises a distribution system for distributing air below a water surface and a compressor with an air inlet and at least one air outlet, whereby the compressor is configured to be placed below the water surface in that the compressor is provided with a closed housing configured to prevent an infiltration of the water into the compressor, whereby the infiltration of the water at the air inlet is prevented by an intake pipe being provided of which a first open end is above the water surface and a second open end has a watertight connection to the compressor, whereby the infiltration of the water at the at least one air outlet is prevented by the distribution system having a watertight connection to the at least one air outlet and, due to-the watertight connection of the distribution system or by having at least one valve, the housing is closed to hold back the water and whereby the housing is in thermal contact with the water to cool the compressor, wherein the compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that is mounted on air bearings,

• wherein a portion of pressurized air from the action of the impeller also flows to the air bearings and then to the intake pipe,
• wherein at least one the of the air inlet and/or the air outlet of the compressor is positioned under the motor and/or the impeller such that an air bubble will be enclosed in the compressor to hold back the water in the event of a leak when the compressor is placed below the water surface,
• wherein the distribution system comprises at least two distribution arms leading away from the compressor, each distribution arm equipped with at least two diffusers, and
• wherein at least one distribution arm is provided with a sidelong branch that is equipped with at least one diffuser.

An aerator for aerating water that comprises a distribution system for distributing air below a water surface and a compressor with an air inlet and at least one air outlet, whereby the compressor is configured to be placed below the water surface in that the compressor is provided with a housing configured to prevent an infiltration of the water into the compressor, whereby the infiltration of the water at the air inlet is prevented by an intake pipe being provided of which a first open end is above the water surface and a second open end has a watertight connection to the compressor, whereby the infiltration of the water at the at least one air outlet is prevented by the distribution system having a watertight connection to the at least one air outlet and, due to-the watertight connection of the distribution system or by having at least one valve, the housing is closed to hold back the water and whereby the housing is in thermal contact with the water to cool the compressor, wherein the compressor is a centrifugal compressor that comprises an impeller that is driven by a shaft that is mounted on air bearings,

• wherein a portion of pressurized air from the action of the impeller also flows to the air bearings and then to the intake pipe,
• wherein the compressor and the distribution system are arranged so that the compressor and the distribution system are configured to rotate around a vertical axis,
• wherein the distribution system is equipped with a nozzle with a direction that has at least a component perpendicular to the radial direction, and
• wherein the aerator rests on a turntable that is configured to rest on the bottom of a reservoir in which the water is located.