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Method for degrading humic pollutants by catalytic wet cooxidation

A technology of co-oxidation and humic substances, which is applied in the field of treatment of humic pollutants, can solve problems such as high reaction temperature, and achieve the effects of high reaction activity, low treatment cost and thorough removal.

Inactive Publication Date: 2014-02-12
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that landfill leachate can be effectively treated by using CWAO technology, but the catalytic system reported in the literature generally requires a relatively high reaction temperature (>220°C)

Method used

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  • Method for degrading humic pollutants by catalytic wet cooxidation
  • Method for degrading humic pollutants by catalytic wet cooxidation
  • Method for degrading humic pollutants by catalytic wet cooxidation

Examples

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Embodiment 1

[0023] Embodiment 1 catalytic wet co-oxidation process fulvic acid aqueous solution

[0024] A method for degrading humic pollutants by catalytic wet co-oxidation of the present invention, specifically catalytic wet co-oxidation method for treating fulvic acid aqueous solution, comprising the following steps: making 20mL pH value 2-12, COD concentration 100-400mg / L The aqueous solution of fulvic acid is added to the autoclave, and then one or more of methanol, ethanol, propanol, isopropanol, phenol, aniline, and chlorophenol are added to the aqueous solution as a co-oxidation substance to make the co-oxidation substance The ratio of the molar concentration to the COD concentration of the fulvic acid aqueous solution is 0.01 to 10mmol / L: 100mg / L, and the catalyst is added at the same time so that the ratio of the anion molar concentration of the catalyst to the COD concentration of the fulvic acid aqueous solution is 0.01 to 10mmol / L: 100mg / L L, sealed, and finally filled with ...

Embodiment 2

[0028] Embodiment 2 catalytic wet co-oxidation process humic acid aqueous solution

[0029] A method for degrading humic pollutants by catalytic wet co-oxidation of the present invention is specifically a catalytic wet co-oxidation method for treating humic acid aqueous solution (i.e. humic acid wastewater), comprising the following steps: making 20mL COD concentration 100mg / L, BOD 5 / Humic acid wastewater with a COD value of 0.05 (pH=7.0) was added to the autoclave, and then chlorophenol was added as a co-oxidation substance, and NaNO was added at the same time 2 As a catalyst, seal it, and finally fill it with 0.5MPa oxygen, stir it magnetically at a speed of 500rpm, and react at 150°C for 4 to 6 hours. The COD removal rate of the solution after the reaction (when calculating the COD removal rate, the initial COD concentration includes COD concentration of acid wastewater and COD concentration of co-oxidized substances) and BOD 5 / COD values ​​are shown in Table 2 (“–” me...

Embodiment 3

[0032] Example 3 Catalytic wet co-oxidation method to treat late landfill leachate

[0033] A method for degrading humus pollutants by catalytic wet co-oxidation of the present invention, specifically catalytic wet co-oxidation method for treating late-stage landfill leachate, containing humus pollutants in the landfill leachate, comprising the following steps: / L, BOD 5 Late landfill leachate with a COD value of 0.08 was added to the high-pressure reactor, and then chlorophenol was added as a co-oxidation substance, and NaNO was added at the same time 2 As a catalyst, seal it, and finally fill it with 0.5MPa oxygen, stir it magnetically at a speed of 500rpm, and react at 150°C for 4 to 6 hours. The COD removal rate of the solution after the reaction (when calculating the COD removal rate, the initial COD COD concentration of filtrate and COD concentration of co-oxidized substances) and BOD 5 / COD values ​​are shown in Table 3 (“–” means not detected).

[0034] Table 3 COD ...

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Abstract

The invention discloses a method for degrading humic pollutants by catalytic wet cooxidation. The method comprises the following steps: a water solution containing the humic pollutants is added in a high-pressure reactor; then a cooxidation material and a catalyst are added; oxygen or air is adopted as an oxidant to feed in the water solution; the humic pollutants are oxidatively degraded under the stirring condition, wherein the reaction temperature is 90-200 DEG C; the total reaction pressure is 0.5-5 MPa; the oxygen partial pressure is 0.1-3 MPa; the cooxidation material is one or several of methanol, ethanol, propanol, isopropanol, phenol, aniline and chlorophenol; the catalyst is one or several soluble salts. The method has the advantages of mild reaction conditions, low treatment cost, high COD (Chemical Oxygen Demand) removal rate and environmental friendliness.

Description

technical field [0001] The invention relates to the treatment of humus pollutants, in particular to a method for catalytic wet co-oxidation degradation of humus pollutants. Background technique [0002] Humic substances are a class of complex polymer compounds, they widely exist in various water bodies, not only the main source of organic carbon in surface and groundwater (E.Oguz, A.Tortum, B.Keskinler.J.Hazard.Mater .2008,157:455-463), is also the main component of refractory organic matter in wastewater such as papermaking waste liquid and landfill leachate (D. K.Yasadi, G.Euverink, M.F.M.Bijmans, V.Racys.Sep.Purif.Technol.2013,108:37-44;F.Wang,D.W.Smith,M.G.El-Din.Water Res.2006,40:463- 474). According to their solubility in acidic and alkaline solutions, humic substances in water bodies are generally divided into two categories: fulvic acid (FA) and humic acid (HA). Among them, FA is soluble in water under all pH conditions, while HA is only soluble in pH Soluble in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/74C02F1/58
Inventor 彭艳蓉王鹏曾光明刘芬汤琳晏铭
Owner HUNAN UNIV
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