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Method for treating track non-degradable organisms in water by aid of heterogenous sulfate radical oxidation

A technology for refractory organic matter and oxidation treatment, applied in the field of environmental pollution control, can solve the problems of reducing the rate of oxidation degradation, etc., and achieve the effect of easy parameters, easy acquisition, and fast activation efficiency

Inactive Publication Date: 2012-08-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Persulfate reacts with light, heat and Fe 2+ SO can be produced under the activation conditions such as transition metal ions 4 · - , where Fe 2+ The method of activating persulfate has high activation efficiency and can be carried out at room temperature of 20°C, but due to Fe 2+ Easily converted to Fe 3+ , and Fe 2+ with SO 4 · - prone to reactions, excess Fe 2+ will consume SO in the reaction system 4 · - , thereby reducing the SO 4 · - Oxidative degradation rate of target pollutants, therefore, controlling Fe in the reaction system 2+ The concentration of the technology is the key to the implementation of

Method used

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  • Method for treating track non-degradable organisms in water by aid of heterogenous sulfate radical oxidation
  • Method for treating track non-degradable organisms in water by aid of heterogenous sulfate radical oxidation
  • Method for treating track non-degradable organisms in water by aid of heterogenous sulfate radical oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 Shown, adopt the method of the present invention to handle the waste water that contains trace p-chloroaniline.

[0026] Add 100 mL of phosphate buffer solution containing a trace amount of p-chloroaniline to the reactor to adjust the pH to 4, wherein the initial concentration of p-chloroaniline is 50 μmol / L; add sodium persulfate and zero-valent iron to the reactor to make sodium persulfate The initial concentration is 2.5mmol / L, and the initial concentration of zero-valent iron is 0.7g / L; zero-valent iron continues to produce Fe in water 2+ , Fe 2+ Activation of sodium persulfate produces sulfuric acid free radicals, which oxidize and degrade trace amounts of p-chloroaniline in water.

[0027] The effect of treatment was detected by high performance liquid chromatography, such as figure 2 As shown, at 25°C, the degradation rate of p-chloroaniline reached more than 99.9% within 10 minutes.

Embodiment 2

[0029] Such as figure 1 Shown, adopt the method of the present invention to process the waste water that contains trace aniline.

[0030] Add 100 mL of phosphate buffer solution containing a small amount of aniline to the reactor to adjust the pH to 4, wherein the initial concentration of aniline is 50 μmol / L; add sodium persulfate and zero-valent iron to the reactor to make the initial concentration of sodium persulfate 2.5 mmol / L, the initial concentration of zero-valent iron is 2g / L; zero-valent iron continuously produces Fe in water 2+ , Fe 2+ Activation of sodium persulfate produces sulfuric acid free radicals, which oxidize and degrade trace amounts of aniline in water.

[0031] Use high-performance liquid chromatography to detect the treatment effect, at 25 ° C, such as figure 2 Shown, the degradation rate of aniline in 10min reaches more than 87%.

Embodiment 3

[0033] Such as figure 1 Shown, adopt the method of the present invention to handle the waste water that contains trace p-chloroaniline.

[0034] Add 100 mL of phosphate buffer solution containing a trace amount of p-chloroaniline to the reactor to adjust the pH to 7, wherein the initial concentration of p-chloroaniline is 50 μmol / L; add sodium persulfate and zero-valent iron to the reactor to make sodium persulfate The initial concentration is 2.5mmol / L, and the initial concentration of zero-valent iron is 5g / L; zero-valent iron continues to produce Fe in water 2+ , Fe 2+ Activation of sodium persulfate produces sulfuric acid free radicals, which oxidize and degrade trace amounts of p-chloroaniline in water.

[0035] The effect of treatment was detected by high performance liquid chromatography, such as image 3 As shown, at 25°C, the degradation rate of p-chloroaniline reached over 90.8% within 5 hours.

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Abstract

The invention discloses a method for treating trace non-degradable organisms in water by the aid of heterogenous sulfate radical oxidation. The method includes feeding zero-valent iron into the water to be used as a stable Fe2+ source; generating high-oxidability sulfate radicals by means of activating persulfate; leading the sulfate radicals to oxidize and degrade the track non-degradable organisms in the water; and accordingly achieving the purpose of removing target pollutants. The method is wide in applicable pH (potential of hydrogen) range and can realize an excellent effect in acidic water and neutral water. In addition, the added zero-valent iron can be slowly and continuously converted into Fe2+, and accordingly the sulfate radicals can be obtained by means of continuously and efficiently activating the persulfate. Besides, the method is low in cost, high in treatment efficiency and flexible in operation method, and has a high potential in the technical field of treatment of micro-polluted water.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and relates to deep oxidation treatment and advanced oxidation technology of organic matter in water, in particular to a method for heterogeneous sulfuric acid radical oxidation treatment of trace refractory organic matter in water. Background technique [0002] Advanced oxidation technology refers to the oxidation method that uses the strong oxidizing hydroxyl radical (chemical formula: OH) produced in the reaction as the main oxidant to oxidize, decompose and mineralize organic pollutants in water. Compared with other traditional oxidation technologies, its characteristics The reason is that OH has a strong oxidation ability. As an intermediate product of the reaction, it can induce a series of chain reactions behind, so as to achieve the purpose of removing pollutants; the reaction rate is fast and the selectivity is small, which can quickly mineralize pollutants in was...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/38
Inventor 张永清艾姆提亚兹胡赛因黄少斌杜肖哲
Owner SOUTH CHINA UNIV OF TECH
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