What standard can sea water desalination be used normally?
Desalination to what criteria did the normal use of the article:? Namely the use of desalination of sea water desalination to produce fresh water. It is an open source incremental technology to realize the utilization of water resources. It can increase the total amount of fresh water without being affected by time, space and climate. The water quality is good and the price is gradually reasonable. It can guarantee the stable water supply such as drinking water for coastal residents and industrial boiler water supply. The process of obtaining fresh water from seawater is called desalination. Seawater desalination is mainly 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 also used on certain islands and ships. Desalination is the extraction of salt from seawater. Desalination is not a new idea, it has been used in many regions, especially in the Middle East. Saudi Arabia alone accounts for about one-tenth of global desalination. Israel uses desalination technology to provide about a quarter of household water needs. Modern desalination plants use a method called reverse osmosis, which uses membranes to separate salt. There are now more than 12,000 desalination plants in operation worldwide. However, desalination plants are expensive to construct and require a lot of energy to operate. Desalination is mainly applied to coastal cities in rich countries. Therefore, it is of limited value to poor countries with the worst water supply problems. New technologies that reduce energy use-and therefore lower costs-may contribute to the contribution of seawater desalination. A potentially useful new method, called nanoinfiltration, will use tiny carbon tubes to filter out the salt. Experiments have shown that this tube, called nanotube, has excellent filtering capabilities because of its size on the nanometer scale. However, even with such progress, desalination alone does not seem to be able to solve the world's water problems. Other methods will be needed. There are more than 20 kinds of seawater desalination technologies in the world, including reverse osmosis, low multi-efficiency, multi-stage flash evaporation, electrodialysis, pressure steam distillation, dew point evaporation, hydropower cogeneration, thermal film cogeneration, and the use of nuclear, solar, and wind energy , Tidal energy seawater desalination technology, etc., as well as a number of pretreatment and post-treatment processes such as microfiltration, ultrafiltration, and nanofiltration. In the next 20 years, the international desalination market will have a business opportunity of nearly 70 billion U.S. dollars, and China should have a full share. According to the national seawater utilization special plan, by 2010, China's seawater desalination scale will reach 800,000 to 1 million tons per day, and China's seawater desalination capacity will reach 2.5 million to 3 million tons per day in 2020, especially the state actively supports the desalination industry From January 1, 2008, the income from the desalination project of enterprises will be exempted from income tax. The prospects for the development of China's seawater desalination industry are broad.
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