Wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation

A technology of H2O2 and wastewater treatment, which is applied in the direction of oxidized water/sewage treatment, electrochemical water/sewage treatment, special compound water treatment, etc. It can solve the problems of limited oxidation capacity, great influence of pH, and unsuitable sewage, etc., to reduce The effect of treatment cost, wide pH range and good development prospects

Inactive Publication Date: 2013-03-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the above characteristics, O 3 Oxidation has defects such as limited oxidation ability and great influence of pH, so it is not suitable for actual sewage treatment

Method used

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  • Wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation
  • Wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation
  • Wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: with O 3 Oxidation, electricity to generate H 2 o 2 Comparison of Oxidation for Removal of Organic Matter

[0043] Experimental conditions: gas diffusion cathode 6 area: 10cm 2

[0044] Area of ​​inert anode 5: 1cm 2

[0045] DC power supply: 100mA

[0046] Electrolyte: 0.05M Na 2 SO 4 the solution

[0047] o 3 Concentration: 60.82mg / L

[0048] Aeration flow rate: 0.4L / min

[0049] Initial TOC value of wastewater solution: 85ppm

[0050] Initial pH value of wastewater solution: 8.18

[0051] Note: The solution of waste water is Orange II aqueous solution, Orange II is a kind of dye, and its chemical formula is C 16 h 11 N 2 NaO 4 S; O 3 In the oxidation experiment, the mixed gas is directly exposed to the solution; the electricity generates H 2 o 2 The aeration gas in the oxidation experiment was pure oxygen.

[0052] Table 1 Comparison of removal effects of different treatment processes

[0053]

[0054]

[0055] Table 1 illustrat...

Embodiment 2

[0056] Embodiment 2.: Different electrolytic currents compare the removal of organic matter

[0057] Experimental conditions: gas diffusion cathode 6 area: 20cm 2

[0058] Area of ​​inert anode 5: 1cm 2

[0059] DC power supply: 0mA, 200mA, 400mA,

[0060] o 3 Concentration: 60.82mg / L

[0061] Aeration flow rate: 0.3L / min

[0062] Initial TOC value of wastewater solution: 1550ppm

[0063] Initial pH value of wastewater solution: 7.91

[0064] Note: The treated solution is landfill leachate

[0065] Table 2 The influence of different electrolytic currents on the degradation results

[0066]

[0067] Table 2 shows that within the controlled current range, the greater the electrolysis current, the more electricity generated H 2 o 2 Collaborative O 3 The better the oxidation removal effect, this is due to the increase of current will generate more H 2 o 2 , improving the degradation efficiency.

Embodiment 3

[0068] Embodiment 3.: exposure to different concentrations of O 3 Comparison of removal of organic matter

[0069] Experimental conditions: gas diffusion cathode 6 area: 20cm 2

[0070] Area of ​​inert anode 5: 1cm 2

[0071] DC power supply: 100mA

[0072] o 3 Concentration: 0mg / L, 30mg / L, 60.82mg / L

[0073] Aeration flow rate: 0.3L / min

[0074] Initial TOC value of wastewater solution: 1550ppm

[0075] Initial pH value of wastewater solution: 7.91

[0076] Note: The treated solution is landfill leachate

[0077] Table 3 Exposure to different concentrations of O 3 Influence on the degradation result

[0078]

[0079] Table 3 illustrates that as the exposed O 3 The higher the concentration, the higher the removal efficiency of landfill leachate, which is due to the production of more OH in the process.

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Abstract

The invention discloses a wastewater treatment device and method for in-situ electric generation of H2O2 cooperating with O3 oxidation. The device comprises a reaction container, wherein a magnetic stirrer is arranged at the bottom of the reaction container; a stirring magneton is arranged in the reaction container; a stainless steel microporous aeration head, an inert anode and a gas dispersing cathode are arranged in the reaction container; the inert anode and the gas dispersing cathode are vertically opposite to each other; the reaction container is also provided with a pipeline for introducing O3; and the inert anode and the gas dispersing cathode adopt a DC (direct current) power supply. The method comprises the following steps of: firstly inserting the inert anode and the gas dispersing cathode into the treated wastewater solution, and connecting with the DC power supply; then connecting pure oxygen with an ozone generator by a polytetrafluoroethylene tube; connecting the stainless steel microporous aeration head at a gas outlet of the ozone generator, and inserting into the bottom of the wastewater solution; and finally, switching on the DC power supply to treat the wastewater solution. Through the invention, H2O2 is continuously and efficiently generated and can quickly react with O3 to generate.OH so as to efficiently remove persistent organic pollutants in the water body.

Description

technical field [0001] The invention belongs to the technical field of electrochemical wastewater treatment, in particular to an in-situ electrogenerated H 2 o 2 Collaborative O 3 Oxygenated wastewater treatment device and method. Background technique [0002] o 3 Oxidation technology is widely used in sewage treatment and purification processes. o 3 There are two mechanisms in the oxidation process: (1) direct oxidation. In acidic solution, O 3 Molecules can electrophilically attack organic matter to oxidize it. (2) Indirect oxidation. In alkaline solution, its redox potential is 1.25V vs. NHE, O 3 Molecules first generate OH with strong oxidizing properties, thereby degrading organic matter. According to the above characteristics, O 3 Oxidation has defects such as limited oxidation ability and great influence of pH, so it is not suitable for the actual sewage treatment. [0003] In recent years, some O-based 3 Oxidation advanced oxidation technology (such as U...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F1/72C02F1/78
CPCC02F1/72C02F1/46C02F2001/46166C02F1/78C02F1/722C02F2305/023C02F1/4672
Inventor 王玉珏袁实
Owner TSINGHUA UNIV
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