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What is a membrane?

A membrane is a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Some components are allowed passage by the membrane into a permeate stream, whereas others are retained by it and accumulate in the retentate stream.

What can a membrane be used for?

  • Consentration of fruit juice (removing of water)
  • Purifying of drinking water (hygienic barrier)
  • Fresh water production from sea water (reversed osmosis)
  • Gas / liquid contactor (absorbtion / stripping)
  • Leachate treatment
  • Gas drying (dew point control)
  • Gas separation (Oxygen from air)
  • Selective molecule separation (nano filtration)

Schematic drawing of a module


Selection of membrane processes

  • Microfiltration
  • Ultrafiltration
  • Nanofiltration
  • Hyperfiltration
  • Gas seperation

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