What are the advantages and disadvantages of distilled seawater desalination?

1. Advantages: The reverse osmosis device has the advantages of low investment, low energy consumption, short construction period and easy automatic control, and is suitable for large and medium-sized seawater and brackish water desalination projects. The device has the advantages of small volume, simple equipment and operation, convenient maintenance, normal temperature operation and light equipment corrosion and scaling. The existing problems are the service life and anti-pollution of the membrane, and the reverse osmosis membrane, high-pressure pump and energy recovery device need to be replaced regularly.

2. Disadvantages: Distilled seawater desalination is only suitable for laboratories and small devices, and it is impossible to carry out large-scale seawater desalination production. From the point of view of chemical engineering, water and inorganic salts cannot be completely separated by distillation, that is to say, the water separated by distillation still has a salty taste, mainly because of the relationship between their relative volatilities.

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Distilled seawater desalination equipment can use electric energy, and distilled seawater desalination uses thermal energy and electric energy. Therefore, reverse osmosis seawater desalination is suitable for occasions with power supply, and distillation method is suitable for various occasions with heat source or power supply. However, with the improvement of reverse osmosis membrane performance and the advent of energy recovery device, its water consumption per ton is gradually decreasing.

Reverse osmosis seawater desalination can produce desalinated water equivalent to tap water quality after one desalination. Although the water quality of seawater desalination by distillation is high, reverse osmosis technology still has its own advantages, such as wide application scope, large or small scale and short construction period. It can be built not only on land, but also on vehicles, ships, offshore oil drilling platforms, islands and oil fields.

The reverse osmosis system needs better pretreatment to ensure the effluent quality. In the field of seawater desalination, pretreatment is the key to ensure the long-term stable operation of reverse osmosis system. Due to the high hardness, total solid solution and other impurities in seawater, the reverse osmosis system is sensitive to turbidity, pH value, temperature, hardness and chemicals during operation, so the requirements for influent are relatively high.

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