ROTOR AREATOR type Horitzontal Aereator Brush OXIROTOR , is a horizontal aereator, in which the main axis rotates parallel to the water level. Is a specially designed equipment to transfer oxygen in the biologycal stage of the waste water treatment plants.
The rotor, which is the active part, is constituted of a tabular axis over which the racks are fastened.
When the spin is done, oxygen is transfered inside the liquid mass. The racks hit the water, creating numerous turbulences, so the required oxygen is transferred inside the mixed liquor.
At the same time, a movement of circulation of the water is achieved.
According to the oxygen demand and dimensions of the tanks, the number and length of rotors will be determined.
For this type of rotors, whose diameter between rack edges is of 1m, the tanks must not exceed a water depht of 4.0 meters.
The oxygenation capacity and the consumed power are related to the rotor?s submersive capacity. Water immersion can be controlled by variable spillway of automatic work, which in its turn is contrasted by a preset value.. With this system great electrical consumption is saved.
The rotor generally is installed under a walkway formed by two lateral concrete beams that reach up to 10 cm above the water level. This way, it is protected against splashes, aerosol with movible elements of easy manipulation in order to make easier and safe the maintenance works and protection handrails must be installed.
The motor group and the end support must be anchored over concrete settlings.
For plants with variable volumetric charges, these equipments can be furnished with engines of two speeds.
· Aereation cylinder
· Motor group
· Elastic coupling
Characteristics and description
· Rotor or aereation cylinder: composed by a tubular axis that complies with DIN 1629 regulation, whose width varys according to its length. For protection against the direct proyection of splashes to the motor group and support of the opposite end, at the extremes they have coupled some discs. Around the axis twelve rack assemblys, built in fiberglass reinforced polyamid are mounted. Those racks go fixed to the axis by stainless steel straps.
Motor group: consists of a gearing reducer of eplicyclical type mounted with a triphasic engine in vertical disposition which goes equipped with heating resistance.
· Elastic coupling: is the mechanism that joins and transmits the motor group torque to the rotor. Built with special rubber material with steel nucleous, for its elasticity allows to absorb the small deviations of the aligment in the assembly, as well as to absorb the effects of a possible bend of the axis.
DEFLECTIVE SCREEN (Baffle). Is an optional element and its installation permits a greater performance in the oxygen income, because it pushes forward the air bubbles to the bottom of the tank, increasing the oxygenation zone.
It consists of a plate, generally built in stainless steel which goes through the rank and parallel to the rotor.
It is installed lightly submerged, in front of the rotor in the water circulation direction and with a 30º inclination with the vertical, being supported at it ends by steel guides. In the central part, a tensor permits that this does not bend when the rotor is in operation.
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