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Iron electrochemical water treatment method for convection enhanced ion mass transfer

An electrochemical and water treatment technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Electrochemical reactivity, reduction of electrolysis rate, effect of large specific surface area

Pending Publication Date: 2022-02-25
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are several problems in the traditional ferroelectrochemical water treatment technology. One is that the electrodes used are easily passivated during the electrolysis process, because the electrodes are generally made of metal, which are easily oxidized and corroded, and the ionized metal ions are easy to adhere to the electrodes. , reduce and hinder the further ionization of the electrode
The second is that if only relying on the electric field of the applied voltage to combine the metal cations produced by anode electrolysis with the hydroxide ions produced by cathode electrolysis, the efficiency will be very low. If the force of the electric field is increased, the mass transfer of ions will be accelerated, but This process consumes a lot of energy and is expensive

Method used

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  • Iron electrochemical water treatment method for convection enhanced ion mass transfer
  • Iron electrochemical water treatment method for convection enhanced ion mass transfer
  • Iron electrochemical water treatment method for convection enhanced ion mass transfer

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Methyl orange (MO) wastewater was treated by an electrochemical water treatment technology with convection-enhanced iron ion mass transfer (according to figure 1 The structure is built, the devices used are conventional devices in the field, and the materials used are all commercially available materials. The electrolytic cell is opened for convection, and the opening is located in the middle of the side of the electrolytic cell. The same below), using Na 2 SO 4 Adjust the conductivity of the waste liquid to 1000 us / cm, the initial concentration of methyl orange is 50 mg / L, and the treatment steps are as follows:

[0034] (1) Iron particles with a diameter of 2 mm were uniformly fixed with a porous insulating grid plate as the anode, and carbon particles with a diameter of 3 mm were uniformly fixed with a porous insulating grid plate as the cathode. At the same time, the current collector titanium rod was placed between the particle electrodes During the period, the e...

Embodiment 2

[0045] Heavy metal chromium ion wastewater is treated by an electrochemical water treatment technology with convection enhanced iron ion mass transfer (according to figure 1 The structure is built, and the devices used are conventional devices in the field, and the materials are commercially available materials. The electrolytic cell is opened for convection, and the opening is located in the middle of the side of the electrolytic cell. The same below), use Na 2 SO 4 Adjust the conductivity of the waste liquid to 800 us / cm, and the initial chromium ion concentration to 20 mg / L. The treatment steps are as follows:

[0046] (1) Iron filings with a porosity of 10% were fixed with a porous insulating grid, and a titanium rod was inserted into the current collector as an anode. Carbon particles with a porosity of 20% were fixed with a porous insulating grid, and a titanium rod was inserted into the current collector. as a cathode;

[0047] (2) Place the loaded cathode and anode ...

Embodiment 3

[0056] Fluoride ion-containing wastewater is treated by an electrochemical water treatment method with convective enhanced aluminum ion mass transfer (such as figure 1 ), with Na 2 SO 4 Adjust the conductivity of the waste liquid to 1500 us / cm, and the initial concentration of fluoride ions to 20 mg / L. The steps are as follows:

[0057] (1) Aluminum particles with a diameter of 3 mm were evenly fixed with a porous insulating grid plate as the anode, and carbon particles with a diameter of 3 mm were uniformly fixed with a porous insulating grid plate as the cathode, and the current collector titanium rod was placed between the particle electrodes between;

[0058] (2) Place the loaded two electrodes in a 320 mL electrolytic cell with a distance of 10 cm, pour the fluorine-containing waste liquid into the electrolytic cell, open holes at both ends of the electrolytic cell to connect the peristaltic pump connecting pipe for flow, and turn on the power carry out the electrolyti...

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Abstract

The invention discloses an iron electrochemical water treatment method for convection enhanced ion mass transfer. Based on the principle of electric flocculation, an anode adopts a particle electrode or a porous electrode filled with iron or aluminum, and a cathode adopts a carbon particle filled electrode or a stainless steel electrode or other dimensionally stable electrodes. Convection acts on the cathode and the anode to enhance mass transfer of cathode and anode ions, the flow ratio of cathode and anode waste liquid is controlled to be 1: (1-4) by utilizing an electromagnetic valve, and the convection acts to promote combination of metal ions and hydroxyl ions to generate metal oxides or hydroxides to adsorb and remove pollutants. On one hand, the problem of passivation in existing electrode electrolysis is effectively avoided, on the other hand, rapid meeting of metal ions and OH <-> can be accelerated, and generation of hydroxides and oxyhydroxide of iron or aluminum in the reaction is accelerated. Meanwhile, the convection effect can also prevent generated flocs or ionized ions from being oxidized between particle electrodes or porous electrodes, so that the electrodes are blocked, passivation is generated, and the electrolysis rate is reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment and relates to a ferroelectrochemical water treatment method with convection-enhanced ion mass transfer. Background technique [0002] Ferroelectrochemical water treatment technology is a technology that uses electrolytic cells to treat wastewater. With metals such as iron and aluminum as the anode, metal ions are generated under the action of direct current, which are electrolyzed with the hydroxide (OH) generated by the cathode. - ) through a series of hydrolysis, polymerization and oxidation of ferrous ions, it develops into various hydroxyl complexes, polynuclear hydroxyl complexes, oxides and hydroxides, etc., so that colloidal impurities and suspended impurities in wastewater coagulate and precipitate And separated. At the same time, the charged pollutant particles swim in the electric field, and some of their charges are neutralized by the electrodes to promote their destabilization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461
CPCC02F1/461C02F1/46109C02F2001/46133C02F2001/46161C02F2001/46152
Inventor 陆君张光强王涛范雅琦李文娟何伟黄燕谷家扬
Owner JIANGSU UNIV OF SCI & TECH
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