Deionization integrated treatment method and device for desalinated water

A treatment method and treatment device technology, applied in the field of desalinated water, can solve the problems of poor treatment effect of high-concentration brine, low energy consumption, high energy consumption of membrane fouling, etc., achieve wide applicability, overcome high energy consumption, and have a simple structure Effect

Inactive Publication Date: 2017-06-13
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In recent years, reverse osmosis has developed rapidly due to its simple process and low energy consumption. It has been gradually applied to seawater and brackish water desalination, boiler water softening and wastewater treatment, and combined with ion exchange to produce high-purity water. However, its membrane pollution and High energy consumption is the bottleneck problem restricting its development
As a kind of reverse osmosis technology, low-pressure reverse osmosis technology requires only 1 / 3-1 / 2 of the working pressure of conventional reverse osmosis devices, which can save energy and meet the requirements of low-carbon economy. The treatment effect of high concentration saline is not good

Method used

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  • Deionization integrated treatment method and device for desalinated water

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The influent water adopts self-dispensing water, the main water quality index is TOC = 6-8 mg / L, the main organic component is humic acid, the inorganic component is sodium chloride, the conductivity is 32.5 mS / cm, and the water temperature is 20°C.

[0047] The treatment device is composed of microfiltration membrane module, ultrafiltration membrane module and membrane capacitive deionization module.

[0048]In the test, the microfiltration membrane module adopts polyvinylidene fluoride hollow fiber membrane, the membrane pore size is 0.2 μm, and the membrane passing pressure is lower than 50 kPa. The effective area is 5m 2 , external pressure filtration, water inlet pressure 0.1MPa, ultrafiltration membrane components are cleaned by automatic control, combined air and water cleaning is performed every hour of filtration, the air flushing pressure is 0.3 MPa, the time is 30 s, and the water flushing time is 30 s. The total recoil time is 1 min. The turbidity of the u...

Embodiment 2

[0052] The influent water adopts self-dispensing water, the main water quality index is TOC = 4 mg / L, the main organic component is humic acid, the inorganic component is magnesium chloride, the conductivity is 23 mS / cm, and the water temperature is 20 °C.

[0053] The treatment device is composed of microfiltration membrane module, ultrafiltration membrane module and membrane capacitive deionization module.

[0054] In the test, the microfiltration membrane module adopts polyvinylidene fluoride hollow fiber membrane, the membrane pore size is 0.2 μm, and the membrane passing pressure is lower than 50 kPa. The effective area is 5m 2 , external pressure filtration, water inlet pressure 0.1MPa, ultrafiltration membrane components are cleaned by automatic control, combined air and water cleaning is performed every hour of filtration, the air flushing pressure is 0.3 MPa, the time is 30 s, and the water flushing time is 30 s. The total recoil time is 1 min.

[0055] The turbidit...

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Abstract

The invention discloses a deionization integrated treatment method for desalinated water. The method comprises the following steps: raw water passes through a plurality of membrane filter modules sequentially, and primary filtered water is obtained; the primary filtered water passes through a plurality of capacitive deionization modules sequentially, and secondary filtered water is obtained; the secondary filtered water passes through a low-pressure reverse osmosis module, and purified water is prepared. According to a water treatment device based on the method, the raw mater is treated by the plurality of membrane filter modules, the plurality of capacitive deionization modules and the low-pressure reverse osmosis module, which are connected in seriessequentially, via a water pump, and the purified water is prepared. Microfiltration, ultrafiltration, multiple stages of membrane capacitive deionization and low-pressure reverse osmosis are combined for removing suspended solids, organic matter and salt in water respectively, the problems of high energy consumption, high membrane pollution rate and the like of a conventional reverse osmosis technology are solved, the treatment effect of saline water desalination is improved, the structure is simple, the operation is convenient, equipment maintenance cost is low, and the method and the device have high practicability and extensive applicability.

Description

technical field [0001] The invention relates to a desalination water technology, in particular to a deionization integrated treatment method and device for desalination water. Background technique [0002] With the rapid development of my country's economy, the continuous increase of population, and the increasingly serious environmental problems, the shortage of fresh water resources has become a short board restricting the economic and social development of our country. At present, among more than 660 cities in my country, nearly 400 are short of water, and 108 of them are seriously short of water. It can be seen that the protection and purification of water resources and the protection and treatment of water pollution are imminent. [0003] At present, the main methods to solve the shortage of local water resources in various countries in the world include remote water transfer, underground water intake and construction of reservoirs. my country's South-to-North Water D...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/08
Inventor 陈琳胡勤政王成燚朱亮
Owner HOHAI UNIV
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