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Molecular oxygen activation-coupled water treatment method employing high-efficiency neutral electro-fenton oxidation

A technology of oxidizing water and treatment methods, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as increasing wastewater treatment costs, unfavorable wastewater discharge, and corrosion of equipment. To achieve the effect of simplifying the subsequent treatment process, avoiding iron sludge, and not easy to decompose

Active Publication Date: 2014-06-18
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to maintain a low pH value, it is necessary to add acid to adjust the reaction process. Adding acid not only increases the cost of wastewater treatment, is not conducive to wastewater discharge, but also corrodes equipment

Method used

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  • Molecular oxygen activation-coupled water treatment method employing high-efficiency neutral electro-fenton oxidation
  • Molecular oxygen activation-coupled water treatment method employing high-efficiency neutral electro-fenton oxidation
  • Molecular oxygen activation-coupled water treatment method employing high-efficiency neutral electro-fenton oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Treatment of wastewater containing dye rhodamine B

[0034] Aiming at the electro-Fenton remediation of dye-contaminated water sources, this example uses a self-prepared Rhodamine B aqueous solution as the experimental subject to perform a high-efficiency neutral electro-Fenton treatment experiment with coupled molecular oxygen activation.

[0035] Rhodamine B aqueous solution with a concentration of 10 mg / L was used as simulated wastewater, and the pH of the rhodamine B aqueous solution was 6.6 (no need to add acid and alkali to adjust the pH). Take 25 mL of simulated wastewater, and add sodium tetrapolyphosphate to make the concentration 0.3 mmol / L. The iron wire is used as the anode, the activated carbon fiber is the cathode, the constant current is 0.6mA, the anode current density is 6A / m2, air is blown into the cathode through the aeration device, the air flow rate is 40mL / min, and the simulated wastewater is electro-Fenton oxidation deal with. Such as figur...

Embodiment 2

[0037] Example 2 Treatment of sewage containing pesticide atrazine

[0038] Aiming at the electric Fenton remediation of pesticide-contaminated water sources, this example uses a self-prepared atrazine aqueous solution as the experimental object to carry out an efficient neutral electric Fenton treatment experiment with coupled molecular oxygen activation.

[0039] Taking the atrazine aqueous solution with a concentration of 15 mg / L as the simulated wastewater, the pH of the atrazine aqueous solution is 6.8 (no need to add acid and alkali to adjust the pH). Take 25 mL of simulated wastewater, and add sodium tripolyphosphate to make the concentration 0.5 mmol / L. The iron wire is used as the anode, the activated carbon fiber is the cathode, the constant current is 0.5mA, the anode current density is 5A / m2, air is blown into the cathode through the aeration device, the air flow rate is 60mL / min, and the simulated wastewater is electro-Fenton oxidation deal with. Such as figure 2 As...

Embodiment 3

[0040] Example 3 Treatment of sewage containing pesticide atrazine under different pH conditions

[0041] In this example, a self-prepared atrazine aqueous solution was used as the experimental object to carry out an efficient neutral electric Fenton treatment experiment with coupled molecular oxygen activation.

[0042] Take the atrazine aqueous solution with a concentration of 15 mg / L as the simulated wastewater, add sodium tetrapolyphosphate to the concentration of 0.5 mmol / L, and adjust the initial pH of the solution to 5.3, 6.3, 7.3, 8.3 with NaOH or HCl solution, respectively , 9.3. Take 25mL of simulated wastewater with different initial pH, use iron wire as anode, activated carbon fiber as cathode, constant current 0.5mA, anode current density of 5A / m2, and blow air into the cathode through an aeration device at a flow rate of 60mL / min, the simulated wastewater is subjected to electric Fenton oxidation treatment. Such as image 3 As shown, after 1 hour of electro-Fenton ...

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Abstract

The invention provides a molecular oxygen activation-coupled water treatment method employing high-efficiency neutral electro-fenton oxidation. The method comprises the following steps: in a to-be-processed wastewater system of which the pH is adjusted to 5-9 in advance, taking a substance containing zero-valent iron as an anode, a porous carbon electrode as a cathode and polyphosphate as supporting electrolyte to form an electro-fenton system; electrifying, and simultaneously providing air or oxygen to the cathode lastingly; and carrying out electro-fenton oxidation treatment on the to-be-processed wastewater. By adopting the electrolyte polyphosphate used by the method, not only can the removal rate of organic pollutants in the wastewater and the actual chemical oxygen demand (COD) removal rate of the wastewater be greatly improved, but also a lot of iron cement generated by iron ion hydrolysis can be avoided, and the subsequence treatment process is simplified. Thus, the molecular oxygen activation-coupled water treatment method is applicable to treatment of various organic wastewater.

Description

Technical field [0001] The invention belongs to the technical field of water pollution control, and specifically relates to a high-efficiency neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation, and is suitable for the treatment of refractory organic wastewater in the fields of printing and dyeing, chemical industry, and agriculture. Background technique [0002] In 1894, the French chemist Fenton first discovered that under acidic conditions, Fe 2+ And H 2 O 2 The mixed solution (Fenton's reagent) can effectively oxidize tartaric acid. Fenton's reagent was originally mainly used in the research and application of enzyme reaction, organic synthesis and cell damage mechanism. In 1964, Canadian scientist Eisenhaner first applied Fenton's reagent to wastewater treatment. Studies have shown that Fenton’s reagent can effectively oxidize and remove refractory organic pollutants that cannot be removed by traditional wastewater treatment tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461
Inventor 张礼知王丽
Owner HUAZHONG NORMAL UNIV
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