Description and advantages AIRMAX

General Description l Why the surface aerators AIRMAX? l Sizing l Installation l Reduction of disturbances l Advantages of the AIRMAX aerator l Technical specifications

1) General Description

low speed surface aerator

The AIRMAX surface aerator is a low speed vertical shaft aerator.

This aerator is conceived to produce two different movements in the water:

  • a first movement in the horizontal plane creates the water circulation in an “oxidation ditch” also called Carrousel®.
  • a second movement in the vertical plane mixes the sludge in depth. By the impeller rotation, the water is propelled to the surface from the centre to the exterior of the basin. This flow ensures an excellent mixing of the activated sludge.

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2) Why the surface aerators AIRMAX?

The very low speed vertical shaft aerators are most popular as they have the best oxygen transfer efficiency of all mechanical system, the highest oxygen transfer capacity per aeration unit and the best mixing and propulsion capacity in tanks and oxidation ditches.
 
Compared with the fine porous systems the low speed vertical shaft aerator has a lot of advantages too. Surface aerators hardly need any maintenance at all while fine porous plates or tubes have to be inspected and cleaned frequently. The life time for surface aerators is much longer and the reliability higher. The oxygen transfer efficiency in standard conditions is sometimes lower at the beginning of the plant operation but after a few years it will be higher than with fine porous systems due to fouling of the porous elements and decrease of efficiency, which cannot be prevented despite frequent cleaning.  The level of noise of surface aerators is higher indeed but new simple measures can be taken to reduce it to about the same level as for bubble aeration. Further blower required for fines bubbles creates also noise and need to be covered inside a building with expensive air filtration systems.
All these considerations were decisive for the choice to put efforts in further development of the low speed surface aerator AIRMAX.

 

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3) Sizing

Our engineers can help you to optimise the basin shapes, thanks to a thorough knowledge of the hydraulic flows generated by the aerators.

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4) Installation

The AIRMAX aerator can be fixed on a bridge, or mounted on a floating unit. This floating construction is designed for lagoons or tanks applications, and allows water level variations.

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5) Reduction of disturbances

The AIRMAX aerator can be completed covered to limit noise disturbance and aerosols. Kamps provides soundproof cover in accordance with the project’s requirements.polyester housing for surface aerators

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6) Advantages of the AIRMAX aerator

  • very high oxygen input efficiency in standard conditions (reaeration in clear water according to STORA standard or EN 12255-15)
  • stable oxygen input efficiency in time
  • very low maintenance
  • lifetime >20 years
  • large mixing capacity (in depth)
  • easy propulsion capacity (oxidation ditch)
  • power adjustment
  • oxygen transfer of 10 to 450 kg O2 /h per unit in clear water
  • international references

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7) Technical specifications

low speed surface aerator

  • Material: carbon steel
  • Bearing lifetime:  50.000-100.000 h
  • Service factor: 1.5-2
  • Protection:
    • SA 21/2
    • Epoxy 300µm
  • Bolting: HDG steel
  • Options:
    • sun canopy   
    • polyester housing
    • floats
    • complete skids
    • frequency variator
    • electric panels
    • draft tubes

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Carrousel® is a trade name of DHV