Method for selectively separating anions and cations in salt-containing wastewater by coupling electric field with composite electrofiltration membrane

A technology for compounding anion and salt-containing wastewater, applied in the field of salt-containing wastewater treatment and resource utilization, can solve the problems of poor ion selective separation effect, low membrane service life, low economic benefit, etc., achieves good anti-pollution performance, prevents mutual Diffusion, flexible effects

Active Publication Date: 2021-08-24
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low membrane service life, poor ion selective separation effect and low economic benefit in the existing saline wastewater treatment, the present invention provides a high-efficiency selective separation A method for realizing efficient resource utilization of anions and cations in saline wastewater. The method uses a composite anion electrofiltration membrane, a composite cation electrofiltration membrane coupled with an electric field to realize the separation of anions and cations in saline wastewater; the composite anion electrofiltration The membrane is composed of a metal matrix layer, a porous ceramic layer, and an electrochemical hydrogen evolution layer; the composite cationic electric filtration membrane is composed of a metal substrate layer, a porous ceramic layer, and an electrochemical hydrogen evolution layer; the composite anion electric filtration membrane, the composite cationic electric filtration membrane and the power supply Negative and positive connection

Method used

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  • Method for selectively separating anions and cations in salt-containing wastewater by coupling electric field with composite electrofiltration membrane
  • Method for selectively separating anions and cations in salt-containing wastewater by coupling electric field with composite electrofiltration membrane
  • Method for selectively separating anions and cations in salt-containing wastewater by coupling electric field with composite electrofiltration membrane

Examples

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Embodiment 1

[0033] In this example, the method and device for selectively separating anions and cations in saline wastewater by using an electric field coupled composite electrofiltration membrane are used to carry out advanced treatment and resource utilization of pretreated high-salt wastewater from printing and dyeing. The specific content is as follows:

[0034] (1) Wash the 400-mesh porous stainless steel mesh (40cm×30cm) with 0.5mol / L sodium hydroxide solution, distilled water, 0.5mol / L hydrochloric acid solution and distilled water in sequence, and finally wash with absolute ethanol, dry it and place it in in the mold;

[0035] ZrO 2 30%, sintering aid CuO4%, pore-forming agent dextrin 20%, NaNbO 3 23%, KNbO 3 After the 23% is mixed evenly, take 250g of the mixed material and evenly cover the surface of the metal substrate, and press it into a porous ceramic layer under a pressure of 2430kN by hydraulic equipment; prepare 2 pieces;

[0036] (2) 12% catalytic hydrogen evolution c...

Embodiment 2

[0042] Example 2: In this example, the method and device for selectively separating anions and cations in saline wastewater by using electric field coupled composite electrofiltration membranes are used to treat and recycle phosphogypsum leachate. The specific contents are as follows:

[0043] (1) Wash the 600-mesh porous stainless steel mesh (40cm×30cm) with 0.5mol / L sodium hydroxide solution, distilled water, 0.5mol / L hydrochloric acid solution and distilled water in sequence, and finally wash it with absolute ethanol, dry it and place it in in the mold;

[0044] Take 15% ZnO of ceramic particles, 4% sintering additive CuO, 25% pore-forming agent dextrin, and 56% piezoelectric material bismuth sodium titanate and mix evenly. Take 250g of mixed powder and evenly cover the surface of the metal substrate. A porous ceramic layer with ferroelectricity is pressed under a pressure of 2570kN; 2 pieces are prepared;

[0045] (2) 10% catalytic hydrogen evolution catalyst FeCo / Cu (iro...

Embodiment 3

[0050] Example 3: In this example, the method and device for selectively separating anions and cations in saline wastewater by using an electric field coupled composite electric filtration membrane are used for desalination treatment and resource utilization of seawater. The specific content is as follows:

[0051] (1) Wash the 400-mesh porous aluminum alloy mesh (40cm×30cm) with 0.5mol / L sodium hydroxide solution, distilled water, 0.5mol / L hydrochloric acid solution and distilled water in sequence, and finally wash it with absolute ethanol, dry it and place it in the mold;

[0052] ZrO 2 30%, sintering aid SnO2 4%, pore-forming agent methylcellulose 20%, piezoelectric material NaNbO 3 46%, take 250g of uniformly mixed powder and evenly cover the surface of the metal substrate, press it under a pressure of 2430kN by hydraulic equipment to form a ferroelectric porous ceramic layer; prepare 2 pieces;

[0053] (2) 14% catalytic hydrogen evolution catalyst Ni 3 S 2 Nanorods, 3...

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Abstract

The invention discloses a method for selectively separating anions and cations in salt-containing wastewater by coupling an electric field with a composite electrofiltration membrane. According to the method, after a composite anion electrofiltration membrane and a composite cation electrofiltration membrane are coupled with the electric field, the separation of anions and cations in the salt-containing wastewater can be realized; the composite anion electrofiltration membrane consists of a porous ceramic layer, a metal matrix layer and an electrochemical hydrogen evolution layer; the composite cation electrofiltration membrane is composed of a porous ceramic layer, a metal matrix layer and an electrochemical oxygen evolution layer, according to the method, selective separation of zwitterions and anions in the salt-containing wastewater is achieved, meanwhile, water and ions are used for producing hydrogen and oxygen and obtaining acid-base products, deep treatment and efficient resource utilization of the salt-containing wastewater are achieved, the treatment process is simple and easy to control, the voltage used in the separation process is low voltage, and high economic benefits are achieved.

Description

technical field [0001] The invention relates to the field of saline wastewater treatment and resource utilization, in particular to a method and device for selectively separating anions and cations in saline wastewater with an electric field coupled composite electric filtration membrane. Background technique [0002] Membrane separation is a multi-disciplinary separation technology that emerged rapidly after the 1960s. It has the advantages of high efficiency, energy saving, convenient operation, integration, and high degree of automation. It has been widely used in separation, controlled release, membrane reactor and energy conversion. widely used in various aspects. According to the separation mechanism and application range, the separation membrane can be divided into reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane and microfiltration membrane. [0003] The nanofiltration membrane mainly has the characteristics of nano-scale pore size, ion se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469B01D67/00B01D69/02C02F101/10
CPCC02F1/4693B01D67/00B01D69/02C02F2101/10
Inventor 瞿广飞陈帮金吴丰辉李志顺成冯涛刘亮亮赵晨阳刘珊
Owner KUNMING UNIV OF SCI & TECH
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