Method and apparatus for preparing ultrapure water by sea water desalination

Abstract

The invention provides a seawater desalination preparation device, comprising a water inlet unit (a), a pretreatment unit (b) and a reverse osmosis unit (c) which are connected according to the water inflow sequence, wherein, the water inlet unit (a) is used for sending seawater to be desalinized to the pretreatment unit, and the seawater to be desalinized is drainage of uniflow circulated cooling water from an electric power plant; the pretreatment unit (b) comprises a precipitation device and a filtration device which are connected according to the water inflow sequence, wherein, the upper stream of the precipitation device is connected with a water inlet unit, while the down stream of the precipitation device is connected with the filtration device; and the reverse osmosis unit (c) comprises a boost device, an energy recovery device and a reverse osmosis device which are connected according to the water inflow sequence, wherein, the upper stream of the boost device is communicated with the filtration device in the pretreatment unit, while the down stream of the boost device is communicated with the reverse osmosis device. The seawater desalination preparation device has low cost, thereby the device can be popularized in a large scale and protect environment with scale merit, and can be used for preparing ultrapure water.

Description

technical field

[0001] The invention relates to a separation and purification device and a method, in particular to a seawater desalination device and a method thereof. Background technique

[0002] The problem of water shortage is very urgent and important to the sustainable development of our country. The total amount of fresh water resources in my country ranks sixth in the world, but the per capita fresh water resources are only 1 / 4 of the world average. Most of the water levels are less than 500 cubic meters, and Tianjin, Qingdao, Lianyungang, and Shanghai are less than 200 cubic meters, which is much lower than the internationally recognized standard of serious water shortage of 1,000 cubic meters per capita. According to estimates, after 2010, my country will enter a period of severe water shortage.

[0003] Solutions to water shortages include traditional water transfer and storage projects, water conservation, and sewage reuse, but these measures only redeploy fres...

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