Module M37

The Alfa Laval module M37 is specially designed for ultrafiltration (UF) and microfiltration (MF) of high viscosity products (50-250 cP) and fermentation broths. The module is particularly suited for use in industries such as biotech and pharma, food and beverages as well as pulp and paper

module m37 left side 640x360

Improved products and processes

Ultrafiltration (UF) is unique in that it allows liquids to be separated, concentrated and purified, all at the same time. Water and low molecular-weight substances pass through the membrane whilst high molecular-weight substances are rejected.

The composite structure of our microfiltration (MF) and ultrafiltration (UF) membranes, consisting of a support layer for mechanical strength and a thinner selective layer for the separation, combines the best of two worlds: High mechanical strength and a high capacity/flux.

Plate-and-frame module, M37

The Alfa Laval plate-and-frame M37 module is our high-concentration module for liquids of extremely high viscosity. Many products are non-Newtonian so tend to thin as flow velocity is increased. This effect is fully utilized in the extraordinary design of the thin-channel system of the module M37, making the modules usable for products untreatable by most other UF systems.

The high-concentration Alfa Laval module M37 is developed to meet the future demands for optimized flow dynamics, low energy consumption and low-pressure operation. It is available with membrane area sizes up to 27 m² and it can operate at temperatures up to 80°C, pressures up to 15 bar and pH between 1 and 14. It can be equipped with the entire range of flat sheet ultrafiltration and microfiltration membranes available from Alfa Laval.

Alfa Laval PilotUnit Combi-50 UF/MF

Alfa Laval PilotUnit Combi-50 UF/MFThe Alfa Laval PilotUnit Combi-50 UF/MF is a handy and versatile pilot-scale membrane system comprising an Alfa Laval plate-and-frame module of the type M37 or M38. It is a complete system with necessary pump, valves, tank etc. which needs only power supply, compressed air, water and feed product to operate.


  • processing of substances of extremely high viscosities
  • processing of highly concentrated products
  • low energy consumption
  • standard modules with membrane areas up to 27 m²
  • operation with low pressure drop
  • rugged yet flexible stainless steel and polymer construction
  • thin channel deisgn for handling of wide range of viscosities
  • easy and inexpensive exchange of membranes on site
  • accurate production up-scaling by increasing size or number of modules
  • hygienic design with all materials in compliance with FDA regulations

How it works

M37 drawing

The plate-and-frame module from Alfa Laval is designed with open channels across the membrane surface. The feed stream/retentate flows through these.

The membrane itself is supported by hollow plates with numerous slots that allow the permeate to collect and be removed from the module via the permeate collecting tubes.

Plate-and-frame modules use the membrane itself, aided by lock rings or strips, to seal off the feed/retentate from mixing into the permeate channels. This also prevents any leaks from the plate stack itself.

Plate-and-frame membrane replacementDue to the design of the plate-and-frame modules from Alfa Laval, individual membranes can be replaced without affecting the other membranes of the module.