Views: 3 Author: Site Editor Publish Time: 2025-07-16 Origin: Site
Water is the source of life, but the salt water in the sea cannot be drunk directly. In this case, where does the drinking water for ships come from?
First of all, we understand that ships can be divided into offshore areas, near-shore areas, coastal areas, sheltered areas and inland areas/segments according to their navigation areas.
An international ocean-going ship's voyage often takes several months, and most of the time it is in the deep sea. In order to meet the needs of main engine cooling water, boiler feed water and passengers or crew water, ships usually carry fresh water from ports for use.
However, an overly large freshwater tank will occupy cargo/personnel space, so the amount of freshwater carried cannot meet all usage needs. In addition, the quality of freshwater will change after long-term storage, thus affecting its use.
Therefore, for ocean-going ships with longer routes, seawater desalination devices (commonly known as freshwater generators) are usually considered to prepare seawater into fresh, qualified, and sufficient freshwater.
At present, the commonly used methods for desalination of seawater are: distillation, electrodialysis, reverse osmosis, and freezing.
Reverse osmosis, also known as ultrafiltration, uses a semipermeable membrane that only allows solvents to pass through but not solutes to pass through to achieve seawater desalination. It has the advantages of simple operation, easy installation, and low cost, and is installed and used by most ships.
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