Method for removing organic pollutants in water by activating sulfite with organic peroxy acid

A technology for activating sulfite and organic pollutants, which is applied in the field of water pollution treatment, can solve problems such as sulfite activation, and achieve the effects of simple operation, good treatment effect and cost reduction

Active Publication Date: 2021-01-15
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a method for organic peroxyacid activation of sulfite to remove organic pollutants in water, to solve the problem of sulfite activation in the above-mentioned background technology

Method used

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  • Method for removing organic pollutants in water by activating sulfite with organic peroxy acid
  • Method for removing organic pollutants in water by activating sulfite with organic peroxy acid
  • Method for removing organic pollutants in water by activating sulfite with organic peroxy acid

Examples

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Effect test

Embodiment 1

[0023] At room temperature, add peracetic acid to the water body to be treated whose organic pollutant is iohexol, then adjust the pH value of the water body to be treated to 4 with sodium hydroxide and sulfuric acid, stir evenly with a stirrer and react. Wherein the molar concentration ratio of iohexol, peracetic acid and sodium sulfite in the water body to be treated is 1:40:400. During the reaction, at different reaction time points (0, 1, 3, 5, 10, 15, 20, 30min), water samples were taken to measure the remaining concentration of iohexol in the water body, and the concentration of iohexol under different reaction time conditions was plotted. degradation curve.

[0024] The removal effect of the sulfite system on iohexol, the removal effect of the peracetic acid system on iohexol, and the removal effect of the hydrogen peroxide / sulfite system on iohexol were respectively used as a comparison. The removal effect of acetic acid activated sulfite system on iohexol, draw the d...

Embodiment 2

[0027] At room temperature, add peracetic acid to the water to be treated with iohexol as the organic pollutant, then use sodium hydroxide and sulfuric acid to adjust the pH value of the water to be treated to 3, 4, 5, 6, 7, and stir Stir well and react for 30min. Wherein the molar concentration ratio of iohexol, peracetic acid and sodium sulfite in the water body to be treated is 1:40:400. After the reaction, water samples were taken to measure the remaining concentration of iohexol in the water body, and the degradation efficiency diagram of iohexol under different pH conditions was drawn. The experimental results were as follows: figure 2 shown.

[0028] Depend on figure 2 It can be seen that the ordinate represents the removal efficiency of iohexol, and the pH value of 3 to 7 can realize the efficient degradation of iohexol, and its degradation efficiency is more than 80%, especially when the pH value is 3 to 5, after 30 minutes of reaction, The remaining concentratio...

Embodiment 3

[0030] At room temperature, add peracetic acid to the untreated water whose organic pollutant is sodium diatrizoate, and then use sodium hydroxide and sulfuric acid to adjust the pH value of the untreated water to 3, 4, 5, 6, 7. The stirrer stirred evenly and reacted for 30min. Wherein the molar concentration ratio of sodium diatrizoate, peracetic acid and sodium sulfite in the water body to be treated is 1:40:400. After the reaction, take a water sample to measure the residual concentration of sodium diatrizoate in the water body, and draw the degradation efficiency figure of sodium diatrizoate under different pH conditions. The experimental results are as follows image 3 shown.

[0031] Depend on image 3 It can be seen that the ordinate represents the removal efficiency of sodium diatrizoate, and the efficient degradation of sodium diatrizoate can be achieved at a pH value of 3-7, and the degradation efficiency is above 85%. It shows that peracetic acid activated sulfit...

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Abstract

The invention discloses a method for removing organic pollutants in water by activating sulfite with organic peroxy acid, which is used for degrading organic pollutants in water by activating sulfitewith organic peroxy acid to generate sulfate free radicals and hydroxyl free radicals, and comprises the following steps of: (1) regulating the pH value of a to-be-treated water body containing organic pollutants to 3-10; and (2) adding sulfite and organic peroxy acid into the to-be-treated water body containing organic pollutants, and carrying out stirring reaction for 5-60 minutes at room temperature, so as to realize effective degradation of the organic pollutants. Organic peroxy acid is adopted as an activating agent, the method has the advantages of being efficient, low in cost, free of toxic by-products and the like, extra energy is not needed, and operation is easy and reliable. The method is suitable for degradation of various organic pollutants, has the characteristics of high free radical yield and high organic pollutant removal efficiency, and has good advantages in the field of degradation of organic pollutants in water.

Description

technical field [0001] The invention belongs to the technical field of water pollution treatment, and in particular relates to a method for removing organic pollutants in water by activating sulfite with organic peroxyacid. Background technique [0002] Advanced oxidation technology mainly uses oxidants to decompose into highly active free radicals (hydroxyl free radicals and sulfate radicals, etc.), and quickly degrades organic pollutants in water. Among them, sulfate radicals have a high redox potential (2.5-3.1V), The reactivity is little affected by the pH value, the half-life is long (30-40μs), and the reaction rate with organic pollutants is high (10 6 ~10 9 m -1 the s -1 ), high selectivity and other unique properties, and the reaction is less affected by water quality background substances, so that sulfate radicals have attracted the attention of many researchers. Currently persulfate and sulfite are the main sources of sulfate free radicals. The key to the appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/10C02F101/30
CPCC02F1/725C02F1/722C02F2305/023C02F2101/30C02F2101/101Y02W10/37
Inventor 赵晓丹荆国华周作明武英
Owner HUAQIAO UNIVERSITY
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