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Published on: July 20, 2021
Forward Osmosis Technology and Its Application Progress
Bo Zhang1,2, Ronggang Wang1,2,3, Feng Wang1,2
1Guizhou Branch, China Three Gorges Corporation, Guiyang 550081, China.
Membranes
|July 27, 2026
Summary
Forward osmosis (FO) is a promising membrane technology with low energy use but faces challenges like lower flux and draw solution regeneration. Advances in membranes and draw solutions are key to its future, especially for energy and resource recovery.
Area of Science:
- Membrane Technology
- Separation Processes
- Sustainable Technologies
Background:
- Forward osmosis (FO) is a membrane process gaining traction for its low energy consumption and reduced pollution.
- However, FO faces limitations including lower water flux than reverse osmosis (RO), draw solution regeneration difficulties, limited commercial membranes, and reverse solute flux, hindering industrial adoption.
Purpose of the Study:
- To review the characteristics of forward osmosis membranes and draw solutions.
- To analyze membrane fouling in FO systems.
- To explore the applications and future development trends of FO technology.
Main Methods:
- Review of existing literature on forward osmosis membranes (cellulose acetate, thin-film composite, aquaporin-based biomimetic).
- Classification of draw solutions (gaseous, organic, inorganic, magnetic nanoparticle-based, polymer gel).
- Analysis of FO membrane fouling types (inorganic, organic, colloidal, biofouling) and comparison with pressure-driven technologies.
Main Results:
- FO membranes exhibit varied characteristics, with TFC and biomimetic membranes showing significant potential.
- Draw solutions can be diverse, but their reconcentration and regeneration remain critical energy and economic hurdles.
- FO demonstrates lighter fouling than RO due to the absence of external hydraulic pressure, though fouling types require management.
Conclusions:
- Forward osmosis technology has broad applications in water desalination, wastewater treatment, and energy generation (PRO).
- Continued advancements in membrane materials and draw solution technology are crucial for overcoming current limitations.
- FO is evolving from a water treatment technology to a core technology for energy and resource recovery, particularly in applications like lithium extraction from geothermal water.
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