When the cost of desalinated sea water into the Beijing how to share – desalinat
Beijing Tianjin desalinated water aimed at the public
2009 12 26, 11 on behalf of Beijing citizens into the Tianjin Dagang Power Plant. The desalinated water plant at the same time engaged in the work.
4 days ago on Dec. 22, Beijing residents Water In the original 3.7 yuan per cubic meter, based on increases of 0.3 yuan; in the next two years, the price will rise 0.6 yuan. In order to help people in Beijing fresh water resources better understanding, social welfare organizations, new knowledge through the Internet called the people of Beijing began to Investigation Desalination . Representatives of the people who want to pass the site visits is to learn from Beijing can drink desalinated water.
According to statistics, the Earth's total fresh water resources account for only 3% of water. 3% of the fresh water that can be directly consumed only 0.5%. "Desalinated water" is to take off in the salt water, making it available fresh water.
China Institute of Water Resources Wang Jianhua, Director of the Institute told reporters that at present, desalination of seawater, there are two techniques: distillation and reverse osmosis.
Distillation is the use of heat to evaporate sea water to sea water into steam, further condensation. This method of salt remain in the condensed water does not evaporate. Back in the late 16th century, humans have tried it with distiller on board is prepared by direct evaporation of sea water, creating a precedent of artificial sea water desalination. Rule is to use reverse osmosis thin fine Membrane On the water for dialysis, to promote salt molecules isolated from the water.
Tianjin Dagang Power Plant is used for distillation. Director of the Centre through the plant when the description they use low-pressure high-temperature steam heating sea water, desalination of sea water; also tried to use the surplus to power desalination of seawater, for civilian use. Today, the desalinated water in Tianjin, has entered public life, people can buy in the supermarket labeled desalinated water, mineral water, mineral water prices and less common. Tianjin, about 25% of field Bottled Water Is desalinated water.
expensive desalinated water Difficult burden of the general population
"The cost of desalinated water is too high." Said Wang Jianhua, either distillation or reverse osmosis, all require considerable Energy . In a sea water area, play down the cost per cubic meter of water is about 4 to 5 yuan; If we build pipelines from the water plant into the homes of local residents, the cost per cubic meter may be increased to more than 10 yuan. Such a "high water" hard to afford the residents.
In fact, even for the industry, not all cities can enjoy the convenience of sea water desalination. Desalinated water will be geographical restrictions, it requires the city to a natural seawater, Beijing belongs to the lack of water happens to the city. If it is to use desalinated water in Beijing, to open up the pipe from the other coastal cities network, the desalination of seawater lead to Beijing.
Beijing and Tangshan has been cited Caofeidian consultations desalinated water into the Beijing's intentions. Dong Si from the Central Caofeidian to straight-line distance of about 220 km, altitude difference of 45 meters, along the set 2 Pump Station can be water. Tianjin has the same consideration. Tianjin Ocean in accordance with high-tech industry development program in 2020, Tianjin desalination capacity will be expanded; then, in addition to meeting the needs of Tianjin, the surplus capacity can supply Beijing.
desalinated water Also failed to supply a precedent for other cities
But so far, Beijing has not made the introduction of desalinated water related planning.
"Beijing is not Drinking Water Systems, desalination sea water flows into the water plant needed capital. Does sea water desalination and other water to be mixed? If mixed, how to share the cost? Beijing introduction of desalinated water, these are things to consider.
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