China is a big country of water resources, but also a poor country of water resources. Seawater as an important part of water resources, the effective utilization of seawater is one of the important measures to solve the crisis of water resources in china.
Membrane technologies used in seawater desalination include reverse osmosis, electro osmosis (ED) and membrane distillation (MD). Desalination can greatly reduce the cost of seawater desalination by reverse osmosis membrane desalination rate as high as 99.6%. The emergence and development of reverse osmosis technology has greatly reduced the cost of seawater desalination, and now the reverse osmosis has become the most economical means of water desalination, which has the following advantages:
The application of membrane method in desalination of seawater is very mature.
The reverse osmosis membrane material, membrane element production technology is mature, the price drops greatly, and the application cost is lower.
Small power consumption, the existing technology has reached tons of water consumption of 1.8-4.5 degrees, which is beneficial to save energy and reduce the cost of water production.
Desalination of seawater by membrane process is unit combination, and the scale of construction can be expanded step by step, which is convenient for popularization and application.
Membrane equipment desalination equipment investment involves civil engineering, power engineering, automatic control engineering, pipeline engineering and other related projects, they are mature technology and engineering, and its investment risk is very small.
Reverse osmosis desalination of seawater, coupled with Nano filtration membrane technology, retains the existence of a variety of trace minerals in the sea water which are beneficial to humans, has biological activity, which is a safe drinking water that can directly to drink.
There is no phase change in the reverse osmosis desalination seawater, concentrated seawater salinity is 2-3 times higher than the original seawater, the concentrated seawater can be used not only to breed such as abalone, sea cucumber, scallop, large yellow croaker, shrimp, eel and other high-end products, but also can be more economical to extract bromine, magnesium, uranium, gypsum, metabolite, salt and magnesium sulfate, potassium oxide, magnesium chloride, magnesium phosphate, magnesium oxide and other marine chemicals, to realize comprehensive utilization of marine resources.
The membrane used is a sanitary macromolecule material, which can completely reject harmful substances such as bacteria, viruses, collagen bodies, heavy metal ions and so on, which will benefit people's health.
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