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A controlled approach to promote Fenton oxidation mediated by complexes of calcium and organic acids

A technology of Fenton oxidation and control method, which is applied in chemical instruments and methods, water treatment parameter control, special compound water treatment, etc., can solve the problems of large dosage of chemicals, high input cost and low reaction efficiency

Active Publication Date: 2021-05-07
NANJING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Aiming at the problems of low reaction efficiency, large dosage of chemicals and high input cost in the existing Fenton oxidation treatment process, the method of the present invention simultaneously introduces Ca in the Fenton oxidation treatment system 2+ And organic acid complexes, greatly break through the rate-limiting step of Fenton oxidation reaction, promote the efficiency of Fenton reaction, and accurately control the introduction of Ca according to the concentration of organic matter and hydrogen peroxide in wastewater 2+ concentration, and according to the Fe 2+ and Ca 2+ Calculate the concentration of organic acid complexes in wastewater, and then determine the dosage of organic acid complexes, which can effectively save chemicals and reduce operating costs while maximizing the efficiency of the Fenton reaction

Method used

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  • A controlled approach to promote Fenton oxidation mediated by complexes of calcium and organic acids
  • A controlled approach to promote Fenton oxidation mediated by complexes of calcium and organic acids
  • A controlled approach to promote Fenton oxidation mediated by complexes of calcium and organic acids

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Embodiment 1

[0048] This embodiment is aimed at the high-concentration organic wastewater in the pharmaceutical industry, adopting the comparative test of the treatment method of the present invention and the Fenton treatment method in the prior art, and the specific steps are as follows:

[0049] (1) Take 2L of high-concentration organic wastewater from the pharmaceutical industry, the COD concentration in the raw water is 5530mg / L, the pH of the wastewater is in a neutral state, and the salt content is about 0.6%.

[0050] Sulfuric acid was used to adjust the pH of the waste water to 2. Take 1 L of waste water in two beakers, add 10 g of hydrogen peroxide with a mass concentration of 27%, and add 2.5 g of ferrous sulfate.

[0051] (2) add calcium chloride and fulvic acid in the waste water after step (1) treatment, according to formula C Ca =0.06×(C COD / 1000+C H ) to calculate the concentration of calcium in the wastewater, according to the formula C L =10×C Fe -0.8×C Ca Calculate ...

Embodiment 2

[0060] This embodiment is aimed at the organic waste water that coal chemical industry produces, adopts the comparative test of treatment method of the present invention and the Fenton treatment method in the prior art, concrete steps are as follows:

[0061] (1) Take 2L of organic wastewater produced by the coal chemical industry, the COD concentration in the raw water is 1820mg / L, the pH of the wastewater is in the range of 7-8.5, and the salt content is 0.08%.

[0062] Sulfuric acid was used to adjust the pH value of the waste water to 3. Take 1 L of waste water in two beakers respectively, add 3 g of hydrogen peroxide with a mass concentration of 27%, and add 0.75 g of ferrous sulfate.

[0063] (2) add calcium chloride and citric acid in the waste water after step (1) treatment, according to formula C Ca =0.1×(C COD / 1000+C H ) to calculate the dosing concentration of calcium chloride, according to the formula C L =6×C Fe -0.5×C Ca Calculate the concentration of citri...

Embodiment 3

[0072] This embodiment is aimed at the organic waste water that fine chemical industry produces, adopts the comparative test of treatment method of the present invention and the Fenton treatment method in the prior art, concrete steps are as follows:

[0073] (1) Take 2L of organic wastewater produced by the fine chemical industry in a beaker. The COD concentration in the raw water is 12560mg / L, the pH of the wastewater is in the range of 7-9, and the salt content is about 1.5%.

[0074]Sulfuric acid was used to adjust the pH of the waste water to 4, and 1 L of waste water was taken in two beakers, and 20 g of hydrogen peroxide with a mass concentration of 27% and 2.5 g of ferrous sulfate were added respectively.

[0075] (2) add calcium chloride and fulvic acid in the waste water after step (1) treatment, according to formula C Ca =0.05×(C COD / 1000+C H ) to calculate the concentration of calcium, according to the formula C L =12×C Fe -1.0×C Ca Calculate the dosing conce...

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Abstract

The invention discloses a control method for promoting Fenton oxidation mediated by calcium and organic acid complexes, belonging to the field of wastewater treatment. The treatment steps are as follows: adjust the pH value of the wastewater to 2-5, add Fe 2+ and hydrogen peroxide, introducing Ca in wastewater 2+ Carry out Fenton reaction with organic acid complexes, the organic acid complexes include fulvic acid and citric acid, the present invention makes a great breakthrough by introducing calcium ions and organic acid complexes into the Fenton treatment system The speed control step of Fenton reaction promotes the efficiency of Fenton oxidation, and precisely controls the introduction of Ca according to the concentration of organic matter and hydrogen peroxide in wastewater 2+ concentration, and according to the Fe 2+ and Ca 2+ Calculate the concentration of organic acid complexes in wastewater, and then determine the dosage of organic acid complexes, which can effectively save chemicals while maximizing the efficiency of Fenton reaction.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a wastewater treatment control method for promoting Fenton oxidation effect, in particular to a control method for promoting Fenton oxidation mediated by calcium and organic acid complexes. Background technique [0002] At present, the wastewater discharged by most industries (such as pharmaceuticals, chemicals, petrochemicals, electroplating, pesticides, etc.) will contain organic matter, and the current discharge standards also specify the discharge limit of COD in wastewater. Therefore, the organic matter in the wastewater needs to be removed before the wastewater is discharged. Advanced oxidation of organic matter in wastewater is a commonly used treatment method in existing enterprises, mainly including Fenton oxidation, ozone oxidation, micro-electrolysis and other technologies. Among them, Fenton oxidation produces a large number of hydroxyl radicals ( OH) during the reac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/52C02F1/56C02F1/66C02F1/722C02F9/00C02F2209/06C02F2209/08C02F2301/08C02F2305/026
Inventor 张炜铭高亚娟潘丙才单超吕路汪林吕振华
Owner NANJING UNIV
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