Main benefits
  • Liftable and selfstanding, making it easy to change of the plant configuration—no need to empty the tank
  • Suitable for all usual tank depths, especially deep tanks which no longer require air cooling
  • Designed for non-clogging operation
  • Suitable for both continuous and intermittent process operation
  • Can run as an aerator and/or mixer according to process requirements 
  • High Standard Oxygen Transfer Rate (SOTR) and Standard Aeration Efficiency (SAE) values
Main applications
  • Activated sludge basins and Sequence Batch Reactors (SBR), Membrane Bio Reactors (MBR), and Moving Bed Bio Reactors (MBBR), providing aeration and mixing in a single unit for degrading the biomass
  • Mixing and equalization basins, providing uniform wastewater loading to downstream processes and eliminating odors
  • Sludge storage and stabilization, providing odor control as well as oxidation of sludge
  • Flotation of oil and grease
  • Additional aeration
Main design features
  • Quick and easy installation and maintenance
  • High efficiency hydraulics
  • Heavy-duty submersible gearmotor
  • Heavy-duty mechanical labyrinth shaft seal
Key characteristics
Power range 5 – 37 kW / 7 – 49 HP
Air flow up to 60 m3/min /  2’100 ft3/min
SOTR up to 410 kg O2/h / up to 900 lb O2/h
Operation depth up to 12 m / 40 ft
Air temperature with additional cooling up to 120°C / up to 248°F
Performance range
Submersible OKI 1000 aerator mixer performance range
Submersible OKI 1000 aerator mixer performance range
Submersible OKI 2000 aerator mixer performance range
Submersible OKI 2000 aerator mixer performance range
Case studies and articles
  • Delivering cost savings for wastewater treatment
    Air is one of the most important elements used in wastewater treatment processes. Activated sludge systems require proper aeration of the wastewater to ensure the biological decomposition of organic compounds. However, while air costs nothing, the systems required to deliver it can account for 50 to 90% of the energy consumption of a plant. Therefore, the decisions made with respect to this equipment can have a significant impact on running costs.

  • Aerator mixer upgrades industrial wastewater treatment
    The mill has its own biological wastewater treatment plant with a total capacity of 350’000 population equivalent. Once treated, the water is recycled in the mill or restored to the natural environment. The WWTP has been modernized regularly during the past years

  • Aeration system improves wastewater treatment in a frozen vegetables plant
    The Ardo frozen vegetables factory in Koolskamp, Belgium, has its own wastewater treatment plant with an anaerobic digester, aerated biological basins and a tertiary filtration stage with UF and RO membranes. Most of the treated water can be reused on site. To further improve the efficiency of the WWTP, Ardo decided to progressively replace the old surface aerators in the biological basins by optimally-adapted equipment.

  • Air for efficient aerobic biological treatment
    Norske Skog Boyer Mill in Tasmania is a TMP newsprint mill that has produced paper continuously since 1949. A wastewater treatment plant comprising a central moving bed bioreactor (MBBR) and outer activated sludge tank (AST) treats up to 25’000 m³/d of process effluent. Four sets of HST™ turbocompressors play an essential role in the supply of air for efficient aerobic biological treatment. The compressors feed nine subermersible OKI aerator mixers in the AST and the aeration grid in the MBBR.

  • Case studies
    Wherever fluids are pumped, mixed, controlled or applied, we are there. See how our solutions create value for customers and learn how we can make your pumping and mixing processes more efficient and profitable, safeguarding your production and ensuring lasting reliability.
  • Aerobic digestion
    In aerobic digestion in wastewater treatment, microorganisms continue to break down the organic material. These microorganisms need aeration in order to function, and some level of mixing is required to keep the process efficient and reliable. The result is reduced sludge volume and the prevention of odor. Sulzer has highly suitable products such as compressors, aerators and disc diffuser systems to support the process in the aerobic digester tank.

  • Biological process
    The target of the biological process in wastewater treatment is to remove organic, biodegradable substances via the metabolism of microorganisms and related biochemical processes.

  • Equalization
    The task of mixing in the equalization process is to blend the wastewater in order to prevent sedimentation, stratification and odor formation. It may also be necessary to mix and homogenize wastewater streams that arrive from different sources. Because the water level in the equalization tanks varies significantly and can sometimes be very low, high demands are placed upon the mixers.

  • Industrial water and effluent treatment
    Sulzer has a deep knowledge in wastewater treatment, and with our wide product portfolio we can now offer energy-efficient and reliable solutions for your water collection, neutralization, flocculation, sedimentation, cooling, aeration, sludge storage, digestion, and dewatering processes.

  • Tertiary treatment
    Treated wastewater may occasionally require further treatment. Local discharge rules may pose strict limits that cannot be fulfilled by even the most effective process, or a higher quality of effluent may be requested for its reuse. When tertiary treatment is needed, various levels of filtration can be applied, including very fine filtration. Often, however, a final step of mixing and aeration is sufficient to achieve the target. When this is the case, Sulzer's submersible mixer types ABS XRW and RW can be used, along with submersible aerator type ABS TA–TAK and disc diffuser system types ABS PIK, DS and Sucoflow.
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