Desalination and Secondary Use of Deep Seawater

Desalination Technology

Desalination utilizing small temperature difference, as well as power generation.

Working Principle

Note) Above mentioned model case is the only one of the combinations. We can redesign the system flexibly and propose the most suitable system to clients, according to their needs and the conditions of the installation site.

  1. Warm seawater is supplied into a depressurized flash chamber.
  2. Warm seawater evaporates itself instantly in the flash chamber, which is called "flash evaporation".

  3. The vapor is directed to the condenser.
  4. The vapor is cooled and condensed by cooling water to turn into fresh water.

Characteristics of Desalination

  1. Integration with power generation

    Combination with OTEC/DTEC enables simultaneous power generation and desalination.

  2. Applicable to low quality raw seawater

    Tough against low quality raw seawater. No need for skilled operator for seawater quality control before desalination.

  3. High quality product water

    Distilled water can be produced, which is easy to be used for industrial usage as well as drinking water.

  4. Very important technology in the regions with scarce water resources such as Middle East or the island countries.

Multi-Purpose Utilization of Deep Seawater

Deep seawater pumped up for power generation can be utilized for multiple purposes.





Features of Deep Seawater

  1. Low temperature

    Less than 5℃ at 1000 m depth in general throughout the year.

  2. Nutrition richness

    Resolved nutrients are not consumed and accumulated, due to little consumption by phytoplankton.

  3. High purity

    Little contamination caused by organisms.

  4. Stability of water quality

    Temperature and quality of water is stable throughout the year.

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