Fine bubble aeration is a subsurface form of diffusion in which air is introduced in the form of very small bubbles in order to enhance the treatment process of wastewater. Air flows through a pipe into diffusers located at the bottom of a tank. These air diffusers have numerous small openings, known as pores, which enable air flow through the wastewater in the tank.

The air diffusers are located on the floor of an aeration basin, fixed to horizontal air headers which are evenly spaced along the floor of the tank zones. The air headers are connected to an air distribution pipe system which receives pressurized air from the air mains, supplied by air blowers. Compressed air from the header enters through the holes in the orifice bolt situated under the diffuser disc, and then proceeds to pass through a specialized membrane. The membrane breaks up the air into microscopic bubbles and disperses it evenly over the whole volume of the aeration zone. As the bubbles rise to the surface, oxygen is transferred via diffusion into the liquor solution.


  • Water treatment plants
  • Wastewater treatment plants
  • Treatment of landfill leachate
  • Wastewater ozone diffusion
  • Oxygenation for sludge stabilization
  • Aeration of streams and fish ponds
  • Mining industry
  • Food & beverage
Fine bubble aeration. Fine bubble diffuser wastewater treatment. Fine bubble aeration system. Aeration diffusers wastewater.

Features & Benefits

  • Low energy consumption
  • Backflow prevention
  • Minimal pressure loss
  • Non-clog operation
  • Wide range air flow
  • Simple installation procedures
  • High rate of oxygen transfer
  • Maximum oxygen transfer for high Standard Oxygen Transfer Efficiency (SOTE)

Vertical shaft, slow speed aerators are ideal for the bacterial oxidisation of effluent via the transfer of oxygen from the atmosphere. The aerators provide the necessary turbulence in order to maintain homogenisation and mixing between the live medium, the polluting elements and the water thus resulting in oxygenated sludge. Oxygen transfer rates are proportional to the power absorbed at the aerator shaft and this, in turn, is governed by the size, speed and immersion of the turbine. In addition to a fixed installment, the vertical shafts can be positioned on floating pontoons.

Vertical shaft aeration. Vertical shaft surface aerators. Aeration. Aerator water. Vertical shaft slow speed aerators.


  • Water treatment plants
  • Wastewater treatment plants
  • Mining Industry
  • Food & Beverage

Features & Benefits

  • Very high oxygen input efficiency under standard conditions

  • Stable oxygen input efficiency
  • Physical impossibility of fouling or clogging
  • High alpha factor especially with a high concentration of activated sludge oxygen transfer of between 10 to 450 kg O2/hour per unit
  • Fully accessible without the need for draining the tanks
  • Large agitation capacity (up to 6 m in depth)
  • Efficiency propulsion capacity (oxidation ditch)
  • Power adjustment
  • No bearings in contact with water
  • Very low maintenance
  • Floating aeration can be used to reduce civil costs
  • Lifetime of over 20 years

Fine Bubble Aeration:

Vertical Shaft Aeration: