A neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation

A technology for oxidizing water and treatment methods, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as corroding equipment, increasing wastewater treatment costs, and being unfavorable for wastewater discharge, etc. Achieve the effects of not easy to decompose, simplify the subsequent treatment process, and improve the removal rate

Active Publication Date: 2016-02-10
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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  • A neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation
  • A neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation
  • A neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 controls the sewage containing dye Rhodamine B

[0034] For the electro-Fenton restoration of dye-contaminated water sources, this example uses the self-prepared rhodamine B aqueous solution as the experimental object to carry out the high-efficiency neutral electro-Fenton treatment experiment coupled with the activation of molecular oxygen.

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

Embodiment 2

[0037] Embodiment 2 controls the sewage containing pesticide atrazine

[0038] For the electro-Fenton restoration of pesticide-contaminated water sources, this example uses the self-prepared atrazine aqueous solution as the experimental object to conduct an efficient neutral electro-Fenton treatment experiment coupled with molecular oxygen activation.

[0039]The atrazine aqueous solution with a concentration of 15mg / L was used as the simulated wastewater, and the pH value of the atrazine aqueous solution was 6.8 (no need to add acid and alkali to adjust the pH). Take 25mL of simulated wastewater, and add sodium tripolyphosphate to it to make the concentration 0.5mmol / L. Using iron wire as the anode and activated carbon fiber as the cathode, the constant current is 0.5mA, the anode current density is 5 amps / square meter, air is blown into the cathode through the aeration device, and the air flow rate is 60mL / min, and the simulated wastewater is subjected to electro-Fenton oxid...

Embodiment 3

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

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

[0042] Take the atrazine aqueous solution with a concentration of 15mg / L as the simulated wastewater, add sodium tetrapolyphosphate to it at a concentration of 0.5mmol / L, and adjust the initial pH of the solution with NaOH or HCl solution to be 5.3, 6.3, 7.3, 8.3 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 5A / square meter, blow air into cathode through aeration device, air flow rate is 60mL / min, the simulated wastewater was subjected to electro-Fenton oxidation treatment. like image 3 As shown, after electr...

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Abstract

The invention provides a high-efficiency neutral electric Fenton oxidized water treatment method coupled with molecular oxygen activation, which uses a substance containing elemental iron as an anode in a wastewater system to be treated with pH pre-adjusted to 5-9, and porous carbon The electrode is the cathode, and polyphosphate is the supporting electrolyte to form an electro-Fenton system, and then electrified, while continuously supplying air or oxygen to the cathode, and electro-Fenton oxidation treatment is performed on the wastewater to be treated. The electrolyte polyphosphate used in the present invention can not only greatly improve the removal rate of organic pollutants in wastewater and the COD removal rate of actual wastewater, but also avoid a large amount of iron sludge produced by the hydrolysis of iron ions, simplifying the subsequent treatment process . The invention is applicable to the treatment of various organic waste water.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a high-efficiency neutral electric Fenton oxidation water treatment method coupled with molecular oxygen activation, which 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, French chemist Fenton discovered for the first time 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 waste...

Claims

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Application Information

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