Water treatment method for reducing and degrading halogenated organic matters by using copper-activated thiourea dioxide

A halogenated organic compound and thiourea dioxide technology, which is applied in the reduction water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the harsh reaction conditions of halogenated organic compounds, secondary pollution, and high treatment costs. problem, to achieve the effect of low reaction conditions, stable effect and strong reaction selectivity

Active Publication Date: 2020-06-16
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a green, low-consumption, reduction and degradation method for halogenated organic compounds that can be carried out under normal temperature and pressure, and solve the existing problems of harsh reaction conditions, high processing costs, and secondary pollution of halogenated organic compounds.

Method used

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  • Water treatment method for reducing and degrading halogenated organic matters by using copper-activated thiourea dioxide
  • Water treatment method for reducing and degrading halogenated organic matters by using copper-activated thiourea dioxide
  • Water treatment method for reducing and degrading halogenated organic matters by using copper-activated thiourea dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Prepare a solution of 5 μmol / L sodium diatrizoate, adjust the pH to 7.5 with borate buffer salt, add CuSO 4Stock solution, make the concentration of divalent copper ion reach 10 μmol / L, then add the existing thiourea dioxide stock solution to start the reaction. Do a comparative experiment of adding divalent copper ions and thiourea dioxide alone; the reaction is carried out under magnetic stirring at 25°C, and when the reaction lasts for 1min, 10min, 30min, 60min, 120min, and 180min, samples are taken to determine the concentration of remaining sodium diatrizoate in the solution and the generated iodide ion concentration, the results are as follows figure 1 shown.

[0040] Depend on figure 1 The measurement results show that after 3 hours of reaction, the removal rate of sodium diatrizoate reaches 90%, and the amount of iodide ion generation and the degradation amount of sodium diatrizoate are basically 1:1. In the control experiment, adding divalent copper ions and...

Embodiment 2

[0042] Prepare a solution of 5 μmol / L sodium diatrizoate, adjust the pH to 7.5 with borate buffer salt, add CuSO 4 Stock solution, so that the concentration of divalent copper ions reaches 10 μmol / L, divide the above mixed solution into three groups, one group is continuously magnetically stirred in the air atmosphere, one group is continuously magnetically stirred into the solution to aerate oxygen, and one group is continuously exposed to the solution Nitrogen was aerated with magnetic stirring; the reaction was started by adding the stock solution of thiourea dioxide that was ready to use, and the initial concentration of thiourea dioxide was 50 μmol / L; In the time of 30min, samples were taken respectively to determine the residual sodium diatrizoate concentration in the solution, and the results were as follows: figure 2 shown.

[0043] Depend on figure 2 According to the measured results, after reacting for 30 minutes, the degradation rate of sodium diatrizoate was 48...

Embodiment 3

[0045] Prepare a solution of 5 μmol / L sodium diatrizoate, adjust the pH to 7.5 with boric acid buffer salt, divide the above solution into 7 parts, one part is used as a control, and add salt to the other 6 parts of the solution, so that the solutions have the following concentrations Ions: 2mmol / L chloride ion, 5mmol / L chloride ion, 10mmol / L chloride ion, 2mmol / L bicarbonate ion, 5mmol / L bicarbonate ion, 10mmol / L bicarbonate ion-; in 7 solutions Add CuSO 4 stock solution, so that the concentration of divalent copper ions reaches 10 μmol / L, and then add the existing thiourea dioxide stock solution to start the reaction. The initial concentration of thiourea dioxide is 50 μmol / L; When continuing for 1min, 10min, 30min, 60min, 120min, and 180min, samples were taken respectively to determine the remaining sodium diatrizoate concentration and the iodide ion concentration generated in the solution. The results are as follows: image 3 As shown, the unit mM in the figure represents...

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Abstract

The invention relates to a water treatment method for reducing and degrading halogenated organic matters by copper-activated thiourea dioxide, and belongs to the technical field of wastewater treatment. The method comprises the following steps: adjusting the pH value of the halogenated organic matter wastewater to 6-9, and adding copper ions until the concentration is 0.05-1 mg/L or adding copper-containing solid metal until the concentration is 1-100 mg/L; adding thiourea dioxide of which the concentration is 5-1000 times of the molar concentration of the pollutants, adding buffer salt or alkali liquor to maintain the pH value at 6-9, stirring and uniformly mixing, and reacting at room temperature for 2-10 hours. The added copper ions can be recycled, and no metal mud waste is generated;the reducing agent thiourea dioxide is low in price, and decomposition products are non-toxic and pollution-free; no energy input or complex reaction equipment is needed in the reaction process, the operation is simple and convenient, the reaction is efficient, the effect is stable, the reaction condition requirement is low, the interference of other coexisting inorganic ions and organic matters in the water on the action effect of the method is weak, the reaction selectivity is high, and the halogenated organic pollutants in the water can be removed in a targeted manner.

Description

technical field [0001] The invention belongs to the field of environmental protection, specifically relates to the technical field of production and domestic wastewater treatment, in particular to a treatment method for wastewater containing halogenated organic pollutants. Background technique [0002] Halogenated organic compounds refer to organic compounds that are substituted by halogen atoms such as fluorine, chlorine, bromine, and iodine, and have strong polarity due to the electron-withdrawing effect of halogens. Most halogenated organic substances are biologically toxic, and due to their low water solubility and high fat solubility, their metabolism in organisms is slow, and they are easily passed and accumulated through the food chain in the ecological environment. Halogenated organic compounds are widely used: perfluorinated compounds are extremely stable and are important flame retardants and surfactants; a large number of chlorinated and brominated organic compoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/36
CPCC02F1/70C02F2101/36
Inventor 张涛徐浩丹
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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