The Pentair X-Flow Crossflow Solution is developed to treat (industrial) wastewater streams high in Mixed Liquid Suspended Solids at high fluxes. It is also suitable for oil & gas and mining wastewater treatment.



  • Crossflow: Medium & high strength industrial wastewater
  • Crossflow UF: Oil & gas and mining  wastewater treatment
  • Enchased side stream  UF
  • Small footprint
  • Simple process

typical use


In a Membrane Bioreactor (MBR), the advantages of biological treatment and membrane filtration are combined. Crossflow MBR applies pressurized inside-out UF membranes which are placed outside the bioreactor for a clean process that is easy to operate and maintain. 

Crossflow operation prevents membrane fouling, enabling Crossflow MBR to deal with even higher MLSS than our Airlift technology. 

Recirculation ensures that the recycling water/sludge helps to keep the membranes clean, while simultaneously separating clean water from the feed.

Crossflow UF

Mainly used for industrial wastewater streams with oil content and produced water applications. The X-Flow Compact 75G module was especially developed for such demanding tasks, and applies X-Flow Helix technology to counter fouling and enhance flux rates. The high-strength GRP membrane housings have flange connections on both the feed and permeate side, and high chemical resistance.

In produced water applications, the produced water can be reused as injection water in just three steps (UF membranes, activated carbon, RO).
In contrast to the complex conventional options, this simplified process provides a smaller footprint, less weight, a lower OPEX and a higher permeate quality.


Crossflow combines membranes with biological treatment. Crossflow UF is a unique membrane technology for the treatment of wastewater, such as produced water with oily content. 

With carefully selected partners, 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


Developed for (industrial) wastewater applications, the Crossflow technology is at its best with difficult to treat wastewater. Crossflow  needs more energy (1,5-4 kWh/m³) than our Airlift technology (<0,25 kWh/m3), but offers the advantages of a continuous process and a minimal footprint. Furthermore, it can deal with very high MLSS (12-30+ g/l) and work with a significantly higher flux (80-200 l/m2h).

In specific circumstances, with a COD > 7,000 ppm, the business case for anaerobic MBR may be more favorable, as it also produces renewable energy (biogas). 

Based on your specific feedwater characteristics, our specialist can easily determine the optimum solution for your challenge.

This type of MBR is suited for feed capacities <100m3/h. 

Crossflow UF

Used in applications such as water injection and re-injection, steam assisted gravity drainage (SAGD) and Enhanced Oil Recovery (EOR) or Chemical Enhanced Oil Recovery (CEOR).

The robustly designed Crossflow UF technology is available in four sizes: 1x8 modules, 2x8 modules, 3x8 modules and 4x8 modules, with performances ranging respectively from approximately 50 to 100, 150 and 250 m3/h. 

For capacities under 50 m3/h the Crossflow can be considered.

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