In recent years, a system based on reverse osmosis (RO) has become the fastest growing segment of the seawater desalination market. For further expansion, Global Water Recycling and Reuse Solution Technology Research Association (GWSTA) proposed new desalination system simultaneously reducing both energy consumption and environmental impact of RO brine. Key point is seawater salinity reduction by dilution prior to RO treatment. The full scale plant to confirm the dilution effect was built and operated in Kitakyushu, Japan. As the results, stable operation data was obtained, which indicated 30% or less energy consumption compared with conventional seawater desalination system, and simultaneously new system can adjust brine salinity nearly equal to seawater.

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