China is a country with abundant water resources, but also a country with poor water resources. As an important component of water resources, effective utilization of seawater is one of the important measures to solve the water crisis in China.



The membrane technologies used for seawater desalination mainly include reverse osmosis, electroosmosis (ED), and membrane distillation (MD). The desalination rate of reverse osmosis membrane for seawater desalination is as high as 99.6%. The emergence and development of reverse osmosis technology have greatly reduced the cost of seawater desalination. Now, reverse osmosis has become the most economical method for producing drinking water from seawater desalination. This technology has the following advantages:



The application of membrane desalination technology for seawater is very mature;

The production technology of membrane materials and components such as reverse osmosis is mature, and the price has significantly decreased, resulting in lower and lower application costs;

Low power consumption, existing technology has reached around 1.8-4.5 kWh per ton of water, which is beneficial for energy conservation and reducing water production costs;

The membrane method for desalination of seawater is a combination of units, and the construction scale can be gradually expanded, which is convenient for promotion and application;

The investment in membrane equipment for desalination of seawater by membrane method involves civil engineering, power engineering, automatic control engineering, pipeline engineering, and other related projects, all of which are mature technologies and projects, and their investment risks are very small;

Reverse osmosis desalination of seawater, combined with nanofiltration membrane technology, retains various trace minerals that are beneficial to the human body and has biological activity, making it a safe drinking water that can be directly consumed raw;

Reverse osmosis desalination of seawater has no phase change, and the salt content of the separated concentrated seawater is 2-3 times higher than that of the original seawater. Its concentrated seawater can not only be used for breeding high-end marine products such as sea cucumber, abalone, scallops, yellow croaker, shrimp, sea eel, but also more economically extract marine chemicals such as bromine, magnesium, uranium, gypsum, mirabilite, table salt, potassium oxide, magnesium sulfate, magnesium chloride, magnesium phosphate, magnesium oxide, etc, To achieve comprehensive utilization of marine resources;

The membrane used is a hygienic polymer material that can completely intercept harmful substances such as bacteria, viruses, collagen, and heavy metal ions, which will be beneficial to people's health.