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Membrane contact processes


Membrane contact processes

Membrane contact processes


Membrane contact processes

 

In membrane contact processes a concentration difference is applied over the membrane instead of a difference in mechanical pressure. These concentration differences can lead to a difference in osmotic pressure as in Forward Osmosis or a difference in vapor pressure as in Ammonia Membrane Stripping or Membrane Distillation. These new ways of membrane filtration opens new possibillities of selective concentration of fluids. These are our technologies:

 

Forward Osmosis

• Very low irreversible fouling
• No thermal force on the feed
• High concentration factors possible

Ammonia Membrane Stripping

• Selective recovery of ammonium
• No green house gas emissions (N2O)
• Produces liquid chemical/fertilizer

Membrane Distillation

• Selective removal of water
• Up to 300 g/l of TDS
• Use of low grade heat of 80 oC

Pressure driven membrane processes


Pressure driven membrane processes

Pressure driven membrane processes


Pressure driven membrane processes

 

Microfiltration, ultrafiltration, nanofiltration and reversed osmosis are pressure driven processes. By applying pressure the water flows through the membrane and components with a certain size are retained. The figure shows the size of components passing each type of membrane.

The pressure driven membrane processes are also used in Forward Osmosis applications, where they are used for Draw Solution Recovery. The picture shows a pilot of BLUE-tec, in which RO and MD can be applied after FO.

 

Membrane bioreactor (MBR)


Membrane bioreactor (MBR)

Membrane bioreactor (MBR)


Membrane bioreactor (MBR)

 

Membrane bioreactors are used in wastewater treatment. In a membrane bioreactor the final settler is replace by a membrane systems, resulting in a compact and highly efficient biological treatment system. Membrane bioreactors are used in industrial and municipal wastewater streams and manure treatment.