Device and method for desalinizing alkaline water and seawater as well as concentrating and recovering mineral salts

A brackish water and mineral salt technology, applied in seawater treatment, separation methods, ion-exchange water/sewage treatment, etc., can solve the problem of not being able to infinitely enlarge the amount of treated water, and achieve improved resource utilization, increased application range, resistance to resistance. reduced effect

Active Publication Date: 2013-06-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, none of the above devices can infinitely amplify the amount of treated water

Method used

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  • Device and method for desalinizing alkaline water and seawater as well as concentrating and recovering mineral salts
  • Device and method for desalinizing alkaline water and seawater as well as concentrating and recovering mineral salts
  • Device and method for desalinizing alkaline water and seawater as well as concentrating and recovering mineral salts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] use figure 1 Shown is a device for desalination of brackish water and seawater, concentration and recovery of mineral salt. The anode is a titanium mesh electrode coated with ruthenium, and the cathode is a stainless steel mesh electrode. The anion and cation exchange resins are respectively D201 macroporous strongly basic styrene-based hydrogen-oxygen resin and D001 macroporous styrene-based hydrogen-type resin. The size of the pool is 0.05432m 3 (1.94*0.2*0.14), the thickness of the resin wall is 0.07m. The raw water is 3% salt water. First, the raw water is diverted by the three-way valve, and the main line enters the first fresh water pool, and then flows out through the second fresh water pool. The auxiliary line water enters the concentrated water pool. Before power is applied, the conductivity of the effluent water is close to that of the raw water. Then apply 30V voltage on both sides of the device to conduct electrodeionization treatment on the raw wat...

Embodiment 2

[0031] This device is used in Example 2 to recover minerals in groundwater. Qinghai Glauber's salt is extremely rich in resources. Glauber's salt is a kind of sulfate mineral, and it is a crystal formed by processing and refining the sulfate mineral Glauber's salt. The device, water purification process and operation steps of Example 2 are the same as those of Example 1, except that the cation selective permeable wall is built with diatomite, and the anion selective permeable wall is built with quaternary ammonium strong basic anion resin. The sodium sulfate content in the water is 0.5g / L, and a voltage of 30V is applied to both ends of the electrodes of the device to treat the raw water. After 48 hours of stable operation, the water in the concentrated water tank can reach about 50g / L, and then heated to concentrate and crystallize, which can meet the requirements of recovering Glauber's salt.

Embodiment 3

[0033] In embodiment 3, a membraneless electrodeionization hard water softening device is used to soften boiler water; the deionization device, principle, and operation steps in embodiment 3 are the same as in embodiment 1; 30V is applied to both ends of the device electrodes, and it runs stably and continuously for 20 hours; See Table 1 for water desalination and mineral salt recovery information.

[0034] Ca 2+ (mg / L) Mg 2+ (mg / L) flooded 100 50 out of water 0.5-1.0 0.3-0.8 Concentrated water 5000-10000 2500-8000

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PUM

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Abstract

The invention discloses a device and method for desalinizing alkaline water and seawater as well as concentrating and recovering mineral salts. The device is composed of an anode chamber, a first fresh water tank, a concentrated water tank, a second fresh water tank and a cathode chamber, wherein the compartments are isolated by ion selective permeation walls, a voltage is applied at two ends of the device, and inflow water passes through the first fresh water tank and then passes through the second fresh water tank so as to finally obtain purified outflow water. Under the electromigration action, anions and cations migrate toward anion and cation selective permeation walls, are adsorbed and permeate to enter the concentrated water tank, and the concentrated solution in the concentrated water tank can be subjected to ion recovery. The device can be used for desalinizing seawater and alkaline water, concentrating mineral salts from seawater, extracting mineral salts from alkaline water, softening boiler water, extracting mineral matters from underground mine water and preparing pure water, and can also be used for industrial wastewater treatment to recover useful ions from the wastewater.

Description

technical field [0001] The invention relates to a device and method for desalinating brackish water and seawater, concentrating and recovering mineral salt. Background technique [0002] Currently known seawater desalination technologies include distillation, reverse osmosis, and the like. The distillation method consumes a lot of energy and costs a lot. In the reverse osmosis method, the reverse osmosis membrane has high requirements. At present, it is basically an imported membrane, and it is only suitable for the use of ocean-going ships. Therefore, looking for low-energy, economical and green seawater desalination technology is a current research hotspot. Compared with ordinary electrodialysis (ED), the ion exchange resin filled in the dilute chamber of electrodeionization (EDI) greatly improves the conductivity between the membranes, strengthens the ion migration from the solution to the membrane surface, and destroys the diffusion of the membrane surface. The "ion-p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F1/42C02F103/08
Inventor 吴祖成廖文常园园
Owner ZHEJIANG UNIV
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