Electro-deionization method and device for synchronously concentrating and purifying heavy metal wastewater

An electrodeionization and heavy metal technology, applied in the field of wastewater treatment and heavy metal wastewater treatment, can solve the problems of contact between metal bolts and ion exchange membrane, short circuit, leakage, etc. Effect

Inactive Publication Date: 2008-06-18
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This design can easily lead to the contact between the metal bolt and the ion exchange membrane, resulting in the risk of leakage or even short circuit

Method used

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  • Electro-deionization method and device for synchronously concentrating and purifying heavy metal wastewater
  • Electro-deionization method and device for synchronously concentrating and purifying heavy metal wastewater
  • Electro-deionization method and device for synchronously concentrating and purifying heavy metal wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0049] In this embodiment, the electrodeionization device is a one-stage two-stage structure, and each stage contains two desalination chambers, and its cross-section is shown in Figures 4 and 5 . The separator of the desalination chamber is 100*300*3mm, the separator of the concentration chamber is 100*300*0.9mm, the specification of the separator of the first concentration chamber filled with resin after reversing is also 100*300*3mm, and the effective membrane area 160cm 2 . The ion-exchange membrane used is a special-purpose ion-exchange membrane for heterogeneous low-permeability electrodeionization, produced by Zhejiang Qianqiu Environmental Protection Water Treatment Co., Ltd.; the ion-exchange resins are D072 and D296 macroporous strong acid and strong basic resins, and the volume of the anion and yang resins in the desalination chamber The ratio is 1:1, and the volume ratio of the anion and yang resins filled in the first concentrating chamber after the water flow is...

Embodiment 2

[0052] In this example, the structure of the electrodeionization device, the specifications of the partitions of the concentration chamber and the desalination chamber, the internal water flow, and the ion exchange membrane are all the same as those in Example 1, and the ion exchange resins used are also D72 and D296 macroporous strong acid, strong Basic resin, but the resin particle size range is the standard particle size, that is, 0.3-1.25mm.

[0053] The fresh water raw water tank 30 and the concentrated water circulation tank are also pre-configured with 50 mg·L -1 nickel sulfate (NiSO 4 ) solution, and with H 2 SO 4 Adjust the pH of the raw water in the fresh water tank to 5.1, and the pH of the raw water in the concentrated water circulation tank to 3.16. The electrode water is Na with a mass concentration of 0.3%. 2 SO 4 solution. At the initial stage of operation, the concentrated water is firstly circulated in a closed circuit, and the water output from the fre...

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Abstract

The invention relates to an electro-deionization method and device for concentrating and purifying heavy metal wastewater synchronously, belonging to a wastewater treatment technique, which adopts first-stage two-section or first-stage multi-section electro-deionization device, wherein the inner sides of the positive and negative poles are arranged with corresponding pole protection chambers, the desalting chamber is filled with large-hole strong-acid strong-base mixed bed resin with narrow particles distributed; cation exchange film is adopted as the direction-turning film, after direction-turning, two adjacent concentration chambers are arranged continuously, both are separated by cation exchange film, simultaneously after direction-turning, the first concentration chamber is filled with large-hole mixed bed resin with the volume of cathode resin more than 50 percent, the heavy metal wastewater to be treated enters the desalting chamber and the concentration chamber in two paths, the heavy metal ion and cathode in the desalted water flow are transferred into the concentration chamber so as to obtain the desalted water, the concentrated water flow is partially circulated or closely circulated so as to obtain the concentrated liquid of metal wastewater, thereby recycling valence metals and pure water resources synchronously and realizing zero emission and resource treatment of wastewater. Compared with the prior art, the wastewater treatment process has higher separation efficiency, more reliable operation, more convenient operation, continuous process operation and no secondary pollution.

Description

technical field [0001] The invention relates to a treatment method and device for heavy metal wastewater, in particular to a treatment method for electrodeionization concentration and purification of heavy metal wastewater, which belongs to the wastewater treatment technology. Background technique [0002] Electroplating wastewater is the main source of heavy metal wastewater. The domestic electroplating industry produces more than 4 billion m of electroplating wastewater every year 3 , which accounts for more than 80% is low-concentration electroplating rinse water, and the typical concentration of heavy metal ions generally does not exceed 100mg·L -1 . [0003] The existing heavy metal wastewater treatment methods include evaporation concentration method, chemical method, biological method, ion exchange method, membrane separation (electrodialysis, reverse osmosis) and so on. Evaporation concentration and chemical methods (including chemical precipitation and electrolys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/469C02F1/42
Inventor 王建友卢会霞任安娟付林苏玉龙
Owner NANKAI UNIV
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