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Method for removing organic matters through cooperation of electrochemistry and hydrogen peroxide

A hydrogen peroxide and organic matter technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve the problems of high energy consumption of oxidants, large amounts of iron sludge, etc., and achieve short reaction time and high utilization rate , the effect of saving energy consumption

Active Publication Date: 2020-03-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for electrochemically synergistically removing organic matter with hydrogen peroxide, the purpose of which is to control the reaction parameters so that most of the organic pollutants , react with OH to lose electrons to generate organic free radicals, and then a free radical polymerization reaction occurs between organic monomers to form a polymer chain. When the polymer chain reaches a certain length, the polymer precipitates from the liquid phase to form a solid polymer. After the reaction Most of the organic pollutants can be removed from the water through solid-liquid separation, thereby solving the problems of oxidants and energy consumption in the prior art in the way of high current, high hydrogen peroxide concentration or sacrificial iron anode for pollutant removal. , the technical problem of producing a large amount of iron sludge

Method used

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  • Method for removing organic matters through cooperation of electrochemistry and hydrogen peroxide
  • Method for removing organic matters through cooperation of electrochemistry and hydrogen peroxide
  • Method for removing organic matters through cooperation of electrochemistry and hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In this example the cathode / H 2 o 2 / Fe 3+ The effect of the system on the removal of phenol in aqueous solution. The results showed that during the reaction, phenol was polymerized in the cathode chamber and a black solid precipitate was formed. After reacting for 20 minutes, the cathode reaction liquid was separated from solid and liquid, and the removal rate of phenol reached 84%, and the removal rate of COD reached 30%. figure 1 It is a structural schematic diagram of the reactor in Example 1.

[0060] Operating conditions:

[0061] Anode: a 2cm×2cm platinum plate electrode

[0062] Cathode: two 2cm×2cm platinum plate electrodes connected in parallel

[0063] Phenol solution concentration: 4mmol / L

[0064] Phenol solution volume: 100mL

[0065] Sulfate concentration: 50mmol / L sodium sulfate

[0066] Catholyte volume: 100mL

[0067] h 2 o 2 Concentration: 10mmol / L

[0068] Fe 3+ Concentration: 1mmol / L

[0069] h 2 o 2 with Fe 3+ The molar ratio: 10:1 ...

Embodiment 2

[0075] In this example, the removal effect of several different systems on phenol in aqueous solution was compared, including (1) Fe 3+ Acting alone, (2)H 2 o 2 Acting alone, (3)H 2 o 2 / Fe 3+ system, (4) cathode / H 2 o 2 system, (5) cathode / Fe 3+ system. Among them, the concentration of the phenol solution is 4mmol / L, and the amount and reaction conditions of the corresponding dosing substances in each system are consistent with those in Example 1. After the cathode reaction liquid is separated from solid and liquid, its COD removal rate is respectively 0.6%, 0.5%, 2.2%, 11%, 2.2%, which is far lower than the COD removal rate in Example 1, indicating that the cathode, H 2 o 2 , Fe 3+ The combined action of the three can generate obvious organic solid polymers and significantly improve the COD removal efficiency.

[0076] image 3 It is the comparison figure of the COD removal rate in the phenol aqueous solution and the COD removal rate in the embodiment 1 of differ...

Embodiment 3

[0078] In this example, different Fe 3+ The effect of concentration on the removal efficiency of phenol in aqueous solution, Fe 3+ The dosages are respectively 0.2, 0.5, 1, 2, 3, 4, 5mmol / L, and all the other reaction conditions are consistent with those in Example 1. The results show that with the Fe in the system 3+ As the concentration increases, the side reactions in the system gradually increase, resulting in differences in the degree of polymerization of phenol; when Fe 3+ When the concentration was 1mmol / L, an obvious black solid precipitate was formed. After 20 minutes of reaction, the solution in the cathodic chamber was separated into solid and liquid, and the removal rate of phenol reached 84%.

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Abstract

The invention belongs to the technical field of water treatment, and specifically relates to a method for removing organic matters through cooperation of electrochemistry and hydrogen peroxide. According to the method, a solution containing hydrogen peroxide, transition metal ions and organic matters is used as a reaction solution; at a low current density of less than 5.0 mA / cm<2>, the organic matters and hydroxyl radicals are subjected to an electron transfer reaction to generate organic matter free radicals; polymerization reactions are generated between the organic matter free radicals orbetween the organic matter free radicals and the organic matters to form solid polymers; and the solid polymers are removed through solid-liquid separation so as to remove the organic matters. According to the invention, with the method, the technical problems of high oxidant consumption, high energy consumption and generation of a large amount of iron mud in the method for removing pollutants byusing high current, high hydrogen peroxide concentration or sacrificial iron anode in the prior art are solved; and the method has the advantages of simple and efficient operation, recovery of organicresources and energy, reduction of generation of toxic derivatives, reduction of difficulty in subsequent biological treatment process and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a method for removing organic matter by electrochemical cooperation with hydrogen peroxide. Background technique [0002] The vigorous development of modern industrial production has resulted in an increase in the amount of industrial wastewater year by year, and such wastewater often contains a large amount of artificially synthesized refractory organic pollutants. On the one hand, simple physical and chemical treatment methods cannot completely degrade or transfer pollutants; on the other hand, biological treatment technologies often cannot meet the requirements for dealing with refractory toxic and harmful pollutants. Hydrogen peroxide advanced oxidation technology, such as: UV / H 2 o 2 , O 3 / H 2 o 2 , Fenton and Fenton-like technologies, etc., by producing strong oxidizing OH(E 0 =1.8~2.7V), it can decompose refractory organic pollutants into bio...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/72C02F101/30C02F101/32C02F101/34C02F101/36C02F101/38
CPCC02F1/4672C02F1/722C02F1/725C02F2101/30C02F2101/322C02F2101/327C02F2101/345C02F2101/36C02F2101/38C02F2101/40
Inventor 崔玉虹薛伟俊刘正乾
Owner HUAZHONG UNIV OF SCI & TECH
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