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Method for activating peroxysulphate and degrading pollutant, and application

A technology for activating persulfate and persulfate, which is applied in the field of pollutant treatment, can solve the problems that COD and TN cannot be removed simultaneously, and the removal of nitrate nitrogen cannot be realized, and has good application prospects, excellent degradation effect, and improved degradation efficiency effect

Inactive Publication Date: 2018-12-21
BEIJING UNIV OF AGRI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the system of reducing nitrate nitrogen with iron is greatly affected by the pH value. It has been reported that when the pH value is > 4, the reaction between Fe and nitrate radicals stops, and ammonium ions are easily formed, which cannot realize nitrate nitrogen in the true sense. removal of
At present, there is no ideal method that can simultaneously remove COD and TN in sewage

Method used

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  • Method for activating peroxysulphate and degrading pollutant, and application
  • Method for activating peroxysulphate and degrading pollutant, and application
  • Method for activating peroxysulphate and degrading pollutant, and application

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 1) Selection of iron ion source:

[0046] The source of ferrous iron selected in this embodiment is ferrous sulfate heptahydrate.

[0047] 2) Selection of persulfate:

[0048] The persulfate selected in this embodiment is sodium persulfate.

[0049] 3) Selection of complexing agent: ascorbic acid

[0050] 4) The specific degradation process is implemented according to the following steps:

[0051] Get the p-chlorophenol aqueous solution (concentration is 20mg / L) in the scope of adjusting pH value 10-12, add ascorbic acid: Fe 2+ : The molar ratio of sodium persulfate is 1:10:8, the total volume is 50ml, and the reaction degradation is carried out at 30°C and 200rpm shaking table for 25min;

[0052] Take 3ml of the degraded solution in a 10ml centrifuge tube, extract with an equal volume of ethyl acetate, pass through a 0.22um water filter membrane, and detect the content of p-chlorophenol (4-CP) with high performance liquid phase. It was found that after 20min of 4- ...

Embodiment 2

[0054] 1) Selection of iron ion source:

[0055] The source of ferrous iron selected in this embodiment is ferrous acetate and ferrous sulfate heptahydrate.

[0056] 2) Selection of persulfate:

[0057] The persulfate selected in this embodiment is sodium persulfate.

[0058] 3) Selection of complexing agent: ascorbic acid

[0059] 4) The specific degradation process is implemented according to the following steps:

[0060] Get the p-chlorophenol aqueous solution (concentration is 20mg / L) that adjusts pH value in the scope of 8-9, add ascorbic acid: Fe 2+ : The molar ratio of sodium persulfate is 5:1:1, the total volume is 50ml, and the reaction degradation is carried out at 35°C and 210rpm shaking table for 30min;

[0061] Get the solution after the reaction degradation of 3ml in the 10ml centrifuge tube, extract with equal volume of ethyl acetate, pass through the 0.22um water system filter membrane, detect the content of p-chlorophenol (4-CP) with high performance liqui...

Embodiment 3

[0063] 1) Selection of iron ion source:

[0064] The source of ferrous iron selected in this embodiment is ferrous chloride tetrahydrate.

[0065] 2) Selection of persulfate:

[0066] The persulfates selected in this embodiment are potassium persulfate and sodium persulfate.

[0067] 3) Selection of complexing agent: ascorbic acid

[0068] 4) The specific degradation process is implemented according to the following steps:

[0069] Get the p-chlorophenol aqueous solution (concentration is 20mg / L) in the scope of adjusting pH value 2-4, add ascorbic acid: Fe 2+ : The molar ratio of sodium persulfate is 2:4:7, the total volume is 50ml, and the reaction degradation is carried out at 20°C and shaken at 250rpm for 60min;

[0070] Take 3ml of the degraded solution in a 10ml centrifuge tube, extract with an equal volume of ethyl acetate, pass through a 0.22um water filter membrane, and use HPLC to detect that the degradation rate of p-chlorophenol (4-CP) is 98% for 20 minutes. T...

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Abstract

The invention provides an advanced oxidation system for activating peroxysulphate through ascorbate-ferrous ion coordination, and a method for deeply degrading pollutants. The system for activating peroxysulphate through a ferrous ion coordination system is formed by ascorbic acid, Fe<2+> and peroxysulphate. The method for deeply degrading the pollutants through peroxysulphate comprises the stepsof adding the system for activating peroxysulphate through ascorbate-ferrous ion coordination into waste water containing organic pollutants and nitrogenous pollutants to be treated, and controlling the pH value of the reaction system to range from 2 to 12; degrading at 15 to 50 DEG C for 5 to 60min. The system for activating peroxysulphate through ascorbate-ferrous ion coordination provided by the invention can form a compound peroxysulphate activation system, and the system forms an effective Fe<2+> protection mechanism through trim balance control, so that the resurrection of the Fe<2+> canbe realized, the aim on continuously, stably and efficiently activating peroxysulphate is further achieved, and the meaningless consumption of peroxysulphate is reduced to a certain extent.

Description

technical field [0001] The invention relates to the field of pollutant treatment, in particular to an advanced persulfate oxidation system activated by ascorbic acid combined with ferrous ions, and a method and application thereof for deeply degrading pollutants. Background technique [0002] With the rapid development of my country's economy and the deepening of urbanization, the amount of industrial wastewater and domestic waste has increased, and environmental pollution has become increasingly serious. In recent years, environmental governance has attracted much attention, among which the problem of water pollution is the most urgent. Excessive levels of COD and nitrogen in water bodies are a major problem in environmental governance today. The higher the COD value in the water body, the more serious the organic pollution. Severe excess of nitrogen will lead to eutrophication of the water body, leading to the proliferation of algae, reducing the dissolved oxygen content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/16C02F101/30C02F101/34C02F101/36
CPCC02F1/722C02F2101/16C02F2101/30C02F2101/345C02F2101/36
Inventor 郑燕英韩飞靳永胜陆艺飞付雪晴李晓薇刘欣玮罗健吴峥郑鑫阳程培焱
Owner BEIJING UNIV OF AGRI
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