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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
PubMed
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).

Keywords:
SWROmembrane compactionmembrane permeabilityreverse osmosisspecific energy consumption (SEC)

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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.