Water Treatment 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.
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.
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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