Airlift Megablock

This modular, energy-efficient and fully automated MBR system delivers a high-quality effluent that is suitable for discharge into the environment or at a reusable water source. The Pentair X-Flow Airlift Megablock uses 25 to 50 percent less energy than any submerged system, due to its unique ability to cope with daily wastewater flow fluctuations by switching off units that are not needed.



  • Optimal flow distribution and high flux rates of 50 l/m2/h and up 
  • Removal of all suspended solids
  • No chemical waste discharge
  • Very good anti-fouling behavior
  • No need to remove membrane elements for cleaning
  • Minimized piping and construction, small footprint
  • Modular design (36 to 216 modules) enables easy future expansions 
  • Low energy consumption (0.3 kWh/m3) and chemicals consumption
  • Simple & safe maintenance: externally mounted membrane elements and high level of automation

typical use

The Airlift MBR Megablock is typically used for treating municipal or industrial wastewater. Through the combination of biomass and membranes, the permeate is suitable for reuse of irrigation. 

Due to its 3 mm X-Flow PES membranes, the tightest in the industry, the Megablock can be considered true ultrafiltration (0,025 micron). The 3 meter long membranes are mounted in a modular skid which, due to its smart design, enables easy accessibility for cleaning and maintenance. Most importantly, the skid-based system significantly shortens the construction period. The Megablock is typically a flat slab construction based on sets of 36 modules. 

The Airlift principle is a fully automated process in which sludge and air recirculate at the lowest possible energy consumption. The filtered water is separated by the membranes, which are kept clean by automated process steps, including backwashes and drain sequences. 
Its optimized design and fully automated process limit recirculation and minimize the auxilary equipment (valves, pumps, instruments and control equipment). 

With its high flux rates and output, its low energy consumption and economical design, Megablock is superior in almost all respects to any conventional or submerged MBR technologies suitable for 7000m3 per day and more.

Compact 32V
The X-Flow Compact 32V membrane modules are the heart of the Airlift MBR Megablock. 

They are used for wastewater treatment with feed water TSS up to <12,000 mg/l. It has a virus retention of LOG 4 (99.99%) and a bacteria retention of LOG 6 (99.9999%).

Within the Airlift™ MBR Megablock concept, the Compact 32V membrane modules are not placed in a traditional skid, but into an innovative frame construction with a small physical footprint. The smart and robust plug-and-play system can be constructed quickly and easily onsite.


With carefully selected partners for the biological part, Pentair develops innovative and ready-to-use membrane installations that meet both regulatory and financial KPIs. The Pentair scope consists of the modular skid concept, X-Flow tubular membranes, engineering, commissioning and process optimization.

As one of the world’s foremost membrane technology knowledge centers, we share our scientific know-how and practical experience with our partners to make the difference in challenging filtration projects. Our unique services during start-up and commissioning ensure a flawlessly functioning MBR that will beat the expectations.

Fields of application

Applications for the Airlift MBR Megablock are large-scale municipal and industrial wastewater treatment. By combining biomass and membranes, the wastewater can be reused, for example for irrigation purposes. The combination of biological treatment with UF membrane separation provides a reliable single barrier for bacteria and viruses and enables wastewater treatment plants to efficiently handle fluctuating amounts of water while complying with stringent regulatory requirements. Example applications of the Megablock are municipal wastewater treatment, hospital wastewater and refinery wastewater.

The sweet spot for the Megablock is above 7,5 MLD, whereas the regular Airlift technology is suitable for smaller projects.

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