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Method for activating persulfate and removing pollutants and application

A technology for activating persulfate and persulfate, which is applied in the field of pollutant treatment, can solve the problems of not being able to remove nitrate nitrogen, not being able to simultaneously remove COD and TN, etc., achieve good application prospects, excellent degradation effect, and save operation the effect of time

Active Publication Date: 2018-12-28
BEIJING UNIV OF AGRI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 persulfate and removing pollutants and application
  • Method for activating persulfate and removing pollutants and application
  • Method for activating persulfate and removing pollutants and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1) Selection of iron ion source:

[0048] The source of ferrous iron selected in this embodiment is ferrous sulfate heptahydrate.

[0049] 2) Selection of persulfate:

[0050] The persulfate selected in this embodiment is sodium persulfate.

[0051] 3) Selection of complexing agent: acetylacetone

[0052] 4) The specific degradation process is implemented according to the following steps:

[0053] Get the p-chlorophenol aqueous solution (concentration is 20mg / L) that adjusts the pH value in the range of 10-12, add acetylacetone: Fe 2+ : The molar ratio of sodium persulfate is 1:20:8, the total volume is 50ml, and the reaction degradation is carried out at 30°C and 200rpm shaking table for 25min;

[0054] 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 for 20min to detect that the degradation rate of p-chlorophenol (4-CP) is 95%. The reaction system ...

Embodiment 2

[0056] 1) Selection of iron ion source:

[0057] The source of ferrous iron selected in this embodiment is ferrous acetate and ferrous sulfate heptahydrate.

[0058] 2) Selection of persulfate:

[0059] The persulfate selected in this embodiment is sodium persulfate.

[0060] 3) Selection of complexing agent: acetylacetone

[0061] 4) The specific degradation process is implemented according to the following steps:

[0062] Take the p-chlorophenol aqueous solution (concentration is 20mg / L) that adjusts the pH value in the range of 8-9, add acetylacetone: 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;

[0063] 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 for 20min to detect that the degradation rate of p-chlorophenol (4-CP) is 96%. Th...

Embodiment 3

[0065] 1) Selection of iron ion source:

[0066] The source of ferrous iron selected in this embodiment is ferrous chloride tetrahydrate.

[0067] 2) Selection of persulfate:

[0068] The persulfates selected in this embodiment are potassium persulfate and sodium persulfate.

[0069] 3) Selection of complexing agent: acetylacetone

[0070] 4) The specific degradation process is implemented according to the following steps:

[0071] Take the p-chlorophenol aqueous solution (concentration is 20mg / L) that adjusts the pH value in the range of 8-9, add acetylacetone: Fe 2+ : The molar ratio of sodium persulfate is 2:15:7, the total volume is 50ml, and the reaction degradation is carried out at 20°C and shaken at 250rpm for 60min;

[0072] 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 mi...

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Abstract

The invention provides a system for activating persulfate through combination of acetylacetone and ferrous ions, a method for removing pollutants by the system and an application. The ferrous coordination based persulfate activation system comprises acetylacetone, Fe<2+> and persulfate. The method for removing the pollutants by persulfate comprises steps as follows: the ferrous coordination basedpersulfate activation system is added to to-be-treated wastewater containing organic pollutants and nitrogen pollutants, and pH value of the reaction system is controlled in a range of 2-12; degradation treatment is performed for 5-60 min at 15-50 DEG C. A composite persulfate activation system formed by the ferrous coordination based persulfate activation system can effectively protect Fe<2+>, sothat the purpose of activating persulfate is achieved and meaningless consumption of persulfate is avoided.

Description

technical field [0001] The invention relates to the field of pollutant treatment, in particular to an advanced persulfate oxidation system activated by acetylacetone 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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IPC IPC(8): C02F1/72C02F101/16C02F101/30C02F101/38C02F101/36
CPCC02F1/72C02F2101/16C02F2101/30C02F2101/36C02F2101/38
Inventor 靳永胜李晓薇郑燕英陆艺飞付雪晴韩飞刘欣玮吴峥罗健郑鑫阳程培焱
Owner BEIJING UNIV OF AGRI
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