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Seawater Reverse Osmosis Performance Decline Caused by Short-Term Elevated Feed Water Temperature
Thomas Altmann1, Paulus J Buijs2,3, Andreia S F Farinha2
1Innovation and New Technology, ACWA Power, 41st Floor, The One Tower, Sheikh Zayed Road, Dubai P.O. Box 30582, United Arab Emirates.
Membranes
|August 25, 2022
Summary
A short increase in seawater temperature during desalination significantly harms membrane performance. Even 7 days at 40°C caused a permanent 7.5% rise in energy use for seawater reverse osmosis (SWRO).
Area of Science:
- Water treatment technologies
- Membrane science and engineering
Background:
- Freshwater scarcity drives desalination adoption.
- Seawater reverse osmosis (SWRO) is a key desalination method, but it is energy-intensive.
- Energy consumption in SWRO is primarily for overcoming osmotic pressure, influenced by water temperature and membrane properties.
Purpose of the Study:
- To investigate the impact of short-term elevated feed water temperature on SWRO performance.
- To quantify the permanent effects of temperature increase on energy consumption and membrane performance.
Main Methods:
- A full-scale pilot SWRO system with pretreatment was utilized.
- The study involved a pressure vessel with seven industrial-scale spiral wound membrane elements.
- Feed water temperature was increased to 40°C for a 7-day period.
Main Results:
- A temporary 7-day exposure to 40°C feed water caused a permanent decline in SWRO performance.
- Specific energy consumption increased by 7.5% due to the temperature exposure.
- The study demonstrated a significant and lasting negative impact of elevated temperatures.
Conclusions:
- Elevated water temperatures can cause irreversible damage to SWRO membranes.
- There is a critical need for membrane manufacturers to provide data on temperature effects across a wide range.
- Development of novel membranes with enhanced temperature tolerance is essential for sustainable desalination.
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