Water Treatment Membrane
HOLLOSEP®
FO Membrane
Forward osmosis (FO) is a technology applicable for seawater desalination and wastewater treatment utilizing a natural osmosis.
Natural osmosis is a phenomenon in which water of low salinity solution spontaneously moves into high salinity solution when these two solutions contact each other across a semipermeable membrane. Unlike reverse osmosis (RO) process which requires a high pressure being applied to the feed solution, FO process can deliver low-energy seawater desalination or wastewater treatment process thanks to the utilization of natural phenomenon.
Features
TOYOBO MC's FO membrane is made of cellulose triacetate (CTA). FO membrane elements are manufactured using a unique cross-winding technology to achieve uniform and radial flow.
- Large membrane area and excellent anti-fouling properties
- The large membrane area enables efficient operation. In addition, since chlorine can be applied, it is possible to effectively suppress fouling.
- Long-term stable operation
- The frequency of chemical cleaning and membrane replacement can be kept low.
- Reducing the effect of concentration polarization by thinning
- By reducing the membrane thickness, the influence of concentration polarization is reduced and a high effective osmotic pressure difference can be obtained.
Applications
Seawater desalination
Unlike reverse osmosis (RO) process which requires a high pressure being applied to the feed solution, FO process can deliver low-energy seawater desalination thanks to draw solution (DS) which has higher osmotic pressure than seawater.
Pressure-retarded Osmosis (PRO)
PRO is a technology that generates power by utilizing an osmotic pressure difference between two solutions with different salinities. Since power is generated using the difference in salinity, it is expected as a kind of renewable energy that can generate stable power regardless of weather and season. Toyobo MC's hollow fiber osmosis membrane was adopted at Danish osmotic power plant.
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