The process of seawater desalination is intrinsically energy intensive. Therefore, operating costs related to electricity consumption are very significant and directly impact the sustainability and profitability of a desalination plant.
However, technologically advanced solutions allowed Acciona to create an innovative sea water reverse osmosis (SWRO) modular desalination plant for the Sarlux refinery in Sardinia, Italy, reducing energy consumption compared to traditional solutions.
The system designed and developed by Acciona includes four modular reverse osmosis desalination lines, which supply a total of 12,000 m3 ultrapure water daily with a guaranteed 97% availability over the entire year, thanks to Danfoss solutions.
By employing sophisticated products such as the iSave energy recovery devices, high-pressure pumps and the VLT® AQUA Drive, Acciona was able to optimize the overall efficiency of the plant. The space requirements for the drive are minimal, thanks to the extreme compactness of this AC drive.
And while a typical reverse osmosis desalination plant based on centrifugal high-pressure pumps and energy recovery devices typically requires around 2.7 kW per m3 of water produced, on this site the volumetric high-pressure pumps and iSave isobaric energy recovery devices enable the production of ultrapure water with energy consumption as low as 2.4 kW/m3. This reduction represents 11% savings in energy consumption.