MR10 type AERATION ROTOR is a horizontal aerator, wherein the main axle rotates parallel to the water level. The equipment is especially designed for transferring oxygen during the biological stage in waste water treatment plants.

The rotor which is the active part, consists of a tubular axle to which the shovels are attached.

When it rotates, the oxygen is transferred into the liquid mass. The shovels beat the water creating considerable turbulence, whereby the required oxygen is transferred into the mixed liquid. Also, the water is moved in a circular direction, i.e.: it is stirred.

The number of rotors and their length will be determined according to the oxygen requirements and the tanks size.

For these type of rotors, where the diameter between the shovel ends is 1.0 metre, the water depth in the enclosure must not exceed 4.0 metres.

The oxygenation capacity and consumed power are related to rotor immersion. The water immersion can be controlled using an automatic adjustable overflow, which is controlled by a signal from the dissolved oxygen measurement probes. In turn, this signal is contrasted by a prefixed value. This system enables considerable electrical energy savings.

Generally the rotor is installed underneath a walkway consisting of two lateral concrete beams that are up to 10 cm above the water level. This provides protection against splashing, aerosol emissions and reduces the noise level. The top opening of the walkway must be covered with mobile elements that are easy to handle and make maintenance work safe. Also handrails must be utilized.

The drive unit and the end support must be anchored onto concrete settings.

For plants with variable volumetric loads, this equipment can be fitted with 2-speed motors.

Mechanical composition  

Description and characteristics  

Aeration cylinder or rotor: consist of a tubular axle that complies with standard DIN 1629. Its thickness varies according to its length. At the ends it has discs for protecting against direct sprays to the drive unit and opposite end support. Sets of twelve-shovel stars are mounted around the axle, made of polyamide material reinforced with glass fibre. These shovels are attached to the axle by means of stainless steel strips.

Drive unit: Consists of an epicyclic type gear reducer mounted with a vertically arranged three-phase motor, equipped with heating resistances.

Elastic coupling: This is the mechanism that links and transmits the drive unit torque to the rotor. Made from special rubber material with a steel core, thanks to its elasticity, the effects of any small assembly misalignments can be absorbed, as well as any possible axle buckling effects.

 End support: The base of this support is covered with a polyamide jacket. Basically, it is made up of two roller bearings, separators and sealers, all installed inside a sealed box with a labyrinth closure. It is provided by a lubricating system so the support can be lubricated regularly.

DEFLECTION SCREEN (Baffle). This is an optional element and, if installed, ensures better performance in terms of the oxygen supply, as it pushes the air bubbles towards the bottom of the enclosure, thereby increasing the oxygenation enclosure.
It consists of a plate, generally made from stainless steel, which passes through the enclosure and is parallel to the rotor.

It is installed in a slightly submerged state, in front of the rotor in the water circulation direction and inclined at 30º with respect to the vertical. It is supported on its ends by steel guides. In the central part, a tensor ensures that it does not buckle when the rotor is operating.