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《Journal of Natural Resources》 2002-03
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The desalinization of Bohai sea ice and its use value as fresh water resource

SHI Pei-jun,HA Si,YUAN Yi,ZHOU Jun-hua,XIE Feng (Institute of Resources Science,Beijing Normal University;Key Laboratory of Environmental Change and Natural Disaster,Ministry of Education,Beijing100875,China)  
The problem of water deficiency is serious along the coastal areas of North China,but there are a large scope of sea ice in the Bohai Sea and the northern part of the Huanghai Sea.Salt separation from sea ice in freezing process results in lower salilinity in sea ice,which may become a resolution to the water shortage problem of these areas.According to on-the-spot in-vestigation and indoor experiments of seawater freezing process,this paper sets forth the salt content change of the ice in the Bohai Sea,and the seawater freezing and desalinization process.Then,it analyses the possibility of man-made desalinization of sea ice by using some methods,including refreezing process and centrifugal desalinization.Finally,the use value of sea ice as fresh water is discussed.The results show that:(1)The salinity of sea ice in the investigated area in Bohai Gulf ranges from1.4‰to4.0‰, with an average of2.64‰,far less than that of sea water.(2)The salinity of refreezed melting sea water decreases from40%to70%,or only being0.5‰-2.0‰,close to the salinity of freshwater.Since the salt of sea ice is among the ice-crystal in the form of salt-bubble,the salinity of sea ice will decease by30%~50%after being crushed into pieces,so it is feasible that the salinity of melting sea water ice will decrease remarkably by simple processing.(3)Whether sea ice can be used as freshwater depends on the salinity and alkalinity of the thawed sea ice.Considering the fact that water is deficient in the coastal areas of North China,and the property of soil and salt-resistibility of crops,as well as the salinity of thawed sea ice are in the sufferance range of growing crop,it can be applied to irrigation directly.In addition,the thawed sea ice has many other functions,such as city sanitation water,cooling water of met-allurgy and so on.(4)As freshwater resources,the exploitation of sea ice of Bohai Gulf with massive reserves will be quite promising.The exploitation of sea ice has great economic and social benefits on al-leviating the serious water scarcity problem in North China,increasing the reserve power of freshwater and lightening the degree of relying on Water Transfer from South to North Project.
【Fund】: 科技部农村与社会发展科技司资助。
【CateGory Index】: P74
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