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Rotex - Brush Aerator
The brush rotor was the brainchild of the same man who designed the oxidation ditch: Dr I A Pasveer. Modern Rotex Brush Aerators are more efficient descendants of the original Pasveer brush rotor design. Their traditional use is for oxidation ditches but they can also be used in other configurations.
Directional Flow
Brush rotors are horizontal shaft surface aerators used for oxygen transfer and directional mixing in wastewater treatment. The rotating brush introduces oxygen into the water and induces a strong horizontal flow. Baffles are often installed downstream of the brush rotor to ensure uniform aeration and mixing down to the tank floor.
Market Leading Efficiency
Rotex brush aerators are widely recognised as being the most efficient aerators in their class, typically having a guaranteed oxygen transfer efficiency of 2.0kgO2/kWh in standard conditions. Oxygen transfer and mixing power are controlled by varying the water level (and therefore immersion depth of the aerator) and/or by adjusting the speed of rotation. Variable Frequency Drives (VFDs) are a common method of adjusting the speed of rotation in order to optimise energy efficiency.
The Rotex aerator is made of a seamless, hollow shaft to which the rotor blades are clamped in a star pattern. The blades are offset to form a spiral pattern around the shaft to reduce ‘tramping’ and bearing load as the aerator rotates in water. Rotex aerators can be supplied with access platforms and/or inspection covers for ease of inspection and maintenance.
Integrated Bridge
Rotex Brush Aerators are commonly integrated with an access bridge complete with inspection covers. This allows for offsite pre-fabrication, quick and safe installation, and easy maintenance access.
Superior Build Quality
Rotex also leads the way in build quality, manifested by superior reliability and longevity. Gearboxes are typically designed with a service factor of ≥2.0, which well exceeds most alternative designs.
Versatile
Rotex Brush Aerators have been installed in wastewater treatment processes throughout the UK, from rural wastewater plants in the Scottish Highlands to dairy effluent treatment plants in South West England. They are commonly custom-designed for installation in existing oxidation ditches, and are frequently installed without draindown.
FEATURES
- High oxygen transfer rates (SAE of 2.0kgOj/kWh)
- Strong directional mixing
- Rotor blades arranged around shaft in a spiral pattern
- Robust reliable design - proven worldwide
- Long-life bearings
- Vertical splash plates
- Optional horizontal splash cover
- Clamp-on (ratherthan welded) galvanised or stainless steel blades
- Shaft designed for up to 10m single span
- Baffles provided where specified
- Low vibration
- Optional access bridges
BENEFITS
- Improved energy efficiency and reduced costs
- Maintain solids in suspension
- Reduced impact on bearings
- Safe investment and reduced risk
- Costsavingsfrom reduced maintenance frequency
- Protect bearings and drive units
- Improved QHSE compliance by the reducing splashing and bio-aerosol
- release
- Extended blade life through reduced fatigue and corrosion
- Eliminatesthe complexity of cost of supporting civil structures when
- spanning wide lanes
- For uniform transfer of oxygen and flow velocity in deepertanks
- Energy efficiency and extended asset life
- Improved accessibility for inspection and maintenance