Submersible mixer type ABS XRW 210 to 900

Perfect adaptation for mixing efficiency

The XRW mixer range is Sulzer’s premium range of submersible mixers with outstanding life-cycle economy and superior reliability. The range provides highly efficient motor solutions to match mixing tasks for agitating, blending, mixing, dissolving and suspension of solids in industry, municipal treatment plants and agriculture. The XRW mixers can easily be fitted to existing guiderails and lifting devices without modification, using our wide range of brackets and adapters.

XRW submersible mixers for wastewater treatment mixing applications
Main benefits
  • Lowest energy consumption 
  • Compact, water pressure-tight design 
  • Full stainless steel version available 
  • Shorter mixing times 
  • Minimal risk of motor overloading 
  • Superior reliability and long operating life
  • Easy installation 
  • Small space requirements 
  • As an option, triple seal system with dual oil chamber enhances motor protection for full peace of mind
Main applications
  • Mixing and stirring applications in sewage treatment plants and industrial areas 
  • Homogenization of highly-concentrated sewage sludge
Main design features
  • Easy installation 
  • Small space requirements 
  • Premium-efficiency IE3 motors or equivalent 
  • Mechanical seal protected by a solids deflection ring 
  • Seal monitoring using multiple sensors 
  • Thermo-Control System (TCS) provides timely warnings and auto switch-off
Key characteristics
Maximum mixing flow 1,79 m³/s (28,300 US gpm)
Maximum propeller diameter 900 mm (3.0 in)
More info about XRW mixers
  • The XRW series includes several submersible mixers with integral motors ranging from 0.8 to 25 kW (1.2 - 35.5 hp) for agitating, blending, mixing, dissolving, and suspension of solids in municipal treatment plants, industry, and agriculture. 
  • Sulzer offers highly efficient direct-driven and gear-driven mixers with either standard or explosion-proof motor enclosures.
  • The high speed mixer range XRW 210 and XRW 300 are equiped with squirrel-cage induction motor of IE3 standard. 
  • In the medium-speed range XRW 400 and XRW 650, IE3-equivalent permanent-magnet motors provides the lowest possible energy consumption.
  • The medium-low speeds mixer range XRW 900, are equipped with squirrel-cage induction motor of IE3 standard and a gear box as speed reducer.  
  • Sulzer support includes literature and computer software for sizing and design of each installation.

Data sheets

Dimension drawings

Installation manuals

  • 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.

  • Selector
    The purpose of the selector tank is to control and limit the growth of filamentous bacteria, and then to enhance the sedimentation ability of the sludge. Sulzer provides a number of solutions for creating optimal conditions in the selector.

  • Sludge buffer tank
    The sludge buffer tank can be used for a variety of purposes. The most common application is the blending and homogenization of highly concentrated primary, secondary or digested sludge. The solution used to mix the sludge itself, or to mix the sludge with the dosed thickening chemicals, depends on the design and volume of the sludge buffer tank. Sulzer submersible mixer types ABS XRW and RW, as well as the agitator type Scaba, can be used to provide highly efficient mixing. Positive displacement, progressing cavity transfer pumps are used for sludge feed to sludge dewatering process.

  • 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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