Comprehensive utilization high advantage zero discharge seawater desalination production technology

Abstract

This invention provides a sea-water desalination combination production technology, which is of multi utilization, high efficiency, and zero release. It is primary to obtain salt, secondary to get water, implement multi utilization. Production method can be arranged to concentrate first for extracting salt and second desalinate for extracting water (it can first desalinate for extracting water and second concentrate for extracting). Implement salt water purification by salt water fore treatment, extract seaweed from it, concentrate and extract purified salt water, extract pure saturated brine of which salt concentration achieves 26%-28% (average salt concentration of salt water untreated water is 3.5%), process salinification product with saturated brine, implement integrated usage; desalinate remaining saline water, extract fresh water which achieves drinking standard and of which salinity is lower than 500mg/, increase salt concentration of another saline water to 3.5% (the same as salt water untreated water), circulate to use, not valley, implement zero release; This invention reclaims all of remaining energy and waste heat. It provides cheap and eternal fresh water resource for people and society.

Description

technical field [0001] The invention relates to seawater desalination, in particular to a combined production process for seawater desalination with high efficiency and zero discharge. Background technique [0002] Water is the source of life on which all creatures in nature rely for survival. Because of water, there is life on the earth. Since the 18th century, due to the rapid development of industry and the rapid growth of human reproduction, the ecological environment on the earth's surface has continued to deteriorate. More than 60% of the original forests in the world have been destroyed, and the entire earth's ecology has lost its balance. The fresh water resources that human society depends on It is also constantly decreasing, and many rivers have become dry rivers. However, the consumption of domestic water and industrial water necessary for human beings is increasing year by year, and an irresistible contradiction is formed between the reduction of fresh water res...

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Problems solved by technology

[0006] Applying the above four seawater desalination technologies, the average production cost for each ton of desalinated clean water needs to be RMB 6-10, which is too high to be fully commercialized and applied. What’s more, there is a common problem with the above four methods: After being desalinated, a large amount of concentrated brine (concentration almost doubled, reaching about 5% to 6%) is discharged into the sea again, which increases the salt concentration of seawater in some sea areas and destroys the natural ecology of seawater salinity. Balance, causing pollution to the ecological environment of the ocean, so it will pos

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