Treating method and apparatus for seawater desalting

A seawater and treatment method technology, applied in chemical instruments and methods, general water supply conservation, water/sewage multi-stage treatment, etc. The effect of reducing energy consumption, improving recovery rate and reducing investment

Inactive Publication Date: 2005-02-23
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low recovery rate of seawater desalination water production in the prior art, large energy consumption per

Method used

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  • Treating method and apparatus for seawater desalting

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Effect test

Embodiment 1

[0015] Refer to attached figure 1 , the seawater desalination treatment equipment of the present invention comprises a raw water tank 1, a booster pump body 2, an ultrafiltration device 3, a cleaning pump body 4, an intermediate water tank 5, a high-pressure pump body 6, a reverse osmosis device 7, a nanofilter 8, etc., they connected in turn. The inlet of the raw water tank 1 is connected with the sea water intake, the outlet of the raw water tank 1 is connected with the inlet of the booster pump body 2, the outlet of the booster pump body 2 is connected with the water inlet of the ultrafiltration device 3, and the water produced by the ultrafiltration device 3 is obtained by The outlet flows into the intermediate water tank 5, the outlet of the intermediate water tank 5 is connected to the inlet of the high-pressure pump body 6, the water outlet of the high-pressure pump body 6 is connected to the water inlet of the reverse osmosis device 7, and the fresh water outlet of the...

Embodiment 2

[0017] Refer to attached figure 1 , adopt the equipment of embodiment one, choose suitable seawater concentration 28299mg / L, seawater is first pumped into raw water tank 1, when storing a certain amount of seawater in raw water tank 1, valve 9,11,14 is opened, valve 10,12 , 13 off. Start the booster pump body 2, and pump the seawater into the full filtration ultrafiltration device 3 for pretreatment. The pretreated seawater has removed suspended solids, clay, silt, marine organisms, and other substances in the seawater. This can effectively prevent various suspended solids and scale-forming components in seawater from polluting the reverse osmosis membrane, resulting in a decline or damage to the membrane performance. The difference between the full-filtration ultrafiltration membrane treatment and the cross-flow filtration treatment technology is that the full-filtration ultrafiltration membrane does not discharge the concentrated solution, and all the water passes through ...

Embodiment 3

[0021] Refer to attached figure 1 , using the same method and equipment as in Example 2, selecting a suitable seawater concentration of 28299mg / L, the operating pressure of the reverse osmosis device 7 is 7.0Mpa, the operating pressure of the nanofilter 8 is 4.0Mpa, and the product water recovery rate at this time is 61.0%, and the salt removal rate is 98.96%.

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Abstract

It can improve the water recover rate efficiently after desalting the seawater, and made the equipment simple, save the energy and prevent the sediment on the face of membrane. The key technical scheme: first, the pretreatment seawater is desalted in the reverse osmosis instrument then go into the nanofiltration instrument directly at the high pressure. Last the wastewater return to the reverse osmosis instrument, So it begain a new cycle. The invention can be used to provide fresh water for island, tour region, sea oil flat roof. The equipment also can be loaded in the transporation such as truck, ship and so on.

Description

technical field [0001] The invention relates to a water treatment method and equipment, in particular to a seawater desalination treatment method and equipment combining reverse osmosis and nanofiltration. Background technique [0002] Due to the high salt content, high hardness, and large turbidity changes in seawater, organic and inorganic particles of different particle sizes are suspended at the same time, as well as microorganisms of different sizes, and seawater itself has high osmotic pressure, so seawater desalination It's quite a complicated process. The main factor affecting the recovery rate of seawater desalination is seawater osmotic pressure. In the process of seawater reverse osmosis desalination, fresh water is continuously discharged, and the increase of seawater salt concentration leads to a rapid rise in osmotic pressure and the precipitation of scale-forming components, which eventually leads to desalination. Process aborted. Currently known membrane se...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F9/02
CPCY02A20/131
Inventor 陈益棠
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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