Acciona said that it has conducted a test of a next-generation reverse osmosis (RO) configuration as part of the European innovation project LIFE INDESAL.
The pilot system underwent nearly 2-years of demonstration at the Leading Experimental Accelerator in Desalination (LEAD) facility, situated at the San Pedro del Pinatar desalination plant in Spain. The trials demonstrated stable and efficient performance, producing high-quality permeate water with total dissolved solids (TDS) levels below 200 mg/L, according to the company.
The project’s results indicate that the new configuration significantly reduces the energy consumption of RO processes compared to conventional systems. This improvement is primarily attributed to the implementation of low-pressure multistage RO, which utilises shorter pressure vessels to enhance flux distribution.
Additionally, this configuration allows for more customised membrane-cleaning strategies to address fouling issues, thereby optimising plant performance while maintaining high water quality, as stated by the company. As water scarcity emerges as an increasingly urgent global challenge, improving the efficiency and sustainability of desalination technologies has become a crucial priority for many water-stressed regions worldwide.
Beyond energy savings, the project delved into innovative methods to enhance the circularity of desalination plants by utilising brine streams generated during the process. During the demonstration phase, the system harnessed renewable energy from brine, producing 0.1kWh per cubic metre of brine through reverse electrodialysis. Additionally, it produced chemical reagents on-site from the same stream using electrodialysis with bipolar membranes.
This approach has the potential to enable desalination facilities to directly generate the cleaning chemicals required for membrane maintenance within the plant. This could lead to increased operational self-sufficiency and reduced reliance on external chemical supplies, as stated by Acciona.
Although the solution is currently in the pilot stage, the configuration developed within the LIFE INDESAL project has the potential to be scaled for use in future seawater desalination plants or integrated into existing facilities through partial retrofits, according to the company.
The LIFE INDESAL project, coordinated by Acciona, has a total budget of US $3.58mn and brings together several European partners, including the Department of Chemical and Biomolecular Engineering at the University of Cantabria, APRIA Systems, REDstack and REVOLVE.
Acciona explores next-gen RO system to optimise desalination efficiency Middle East Construction News.
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