Methods for seawater desalination include freezing, reverse osmosis and solar energy.
(1) Freezing method
Freezing method, that is, freezing sea water to freeze it, and the salt is separated when liquid seawater turns into solid ice.
(2) Reverse osmosis method
Also known as the ultrafiltration method, this method uses a semi-permeable membrane that only allows solvents to pass through, but does not does not allow solutes to pass through, to combine sea water and separate it from fresh water. Under normal circumstances, fresh water diffuses to the seawater side through the semi-permeable membrane, causing the liquid level on the seawater side to gradually increase until it reaches a certain height . This process is called osmosis. If an external pressure greater than the osmotic pressure of seawater is applied to the seawater side, the pure water in seawater will reverse osmosis in fresh water. The biggest advantage of the reverse osmosis method is energy saving.
(3) Solar method
The solar distillation method uses a simple solar still. The still consists of a trough with a floating hole made of black porous felt, topped with a clear glass liner sealed around the edges. Sunlight passes through the transparent covering layer and is projected onto the black, insulated bottom of the trough, where it is converted into thermal energy.
Main uses of seawater desalination
Seawater desalination is the use of water desalination from sea to produce fresh water. It is an open source incremental technology that allows the use of water resources. It can increase the total amount of fresh water and is not affected by time, space and climate. The water quality is bone and the price gradually becomes reasonable. ensuring a stable water supply for coastal residents, including drinking water and replenishment of industrial boilers. The process of obtaining fresh water from sea water is called desalination.
Desalination is mainly used to provide drinking water and agricultural water, and sometimes edible salt is also produced as a by-product. Desalination is popular in the Middle East and is used on some islands and ships.
Advantages of seawater desalination device combined with wave energy, solar energy and wind energy
Use equipment suitable for absorbing solar energy and converting it into thermal energy, and use this thermal energy to heat sea water. The H2O in the sea water is evaporated and separated, then the water vapor is exported and cooled to obtain fresh water.
The principle is very simple, in fact it is similar. to a solar water heater. The main cost lies in the selection of equipment and materials, as well as site factors.
Europe now has a massive project to use abundant local solar energy to desalinate the world's seawater. Mediterranean region, especially the Sahara.
Haha, I did a project in this region.
Advantages of wave energy, solar energy and wind energy, for combined power generation, sea water desalination. device:
1. Wide application scope: Wave energy, solar energy and wind energy can be used in different geographical locations and climatic conditions. It has certain applicability in all regions, and this combined power generation seawater desalination device can be suitable for different regions andenvironments.
2. Diversity: it is the combined use of several energy sources, with greater energy diversity, which favors the improvement of the stability and reliability of energy supply.
3 . Energy saving and emission reduction: Using this combined power generation and seawater desalination device can effectively reduce the use of fossil energy, thereby reducing greenhouse gas emissions. greenhouse gases such as carbon dioxide, thus helping to protect the environment and mitigate the influence of climate change.
4. Economic benefits: With the development and maturity of renewable energy technology, the economic benefits of this combined power generation and seawater desalination device will continue to increase in the future.