A high-efficiency organic waste water degrading method

An organic wastewater, high-efficiency technology, applied in chemical instruments and methods, water/sewage treatment, light water/sewage treatment, etc., can solve problems such as being unsuitable for industrial mass production applications, not a research focus, and low chromaticity removal rate. Achieve good application prospects, good degradation effect, and simple operation.

Active Publication Date: 2017-07-14
SOUTHEAST UNIV
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AI Technical Summary

Problems solved by technology

[0003] Due to the limited types of iron-like metals, the removal rate of chroma is much lower than that of iron ions, and it will consume more hydrogen peroxide, so it is not the focus of research; solid catalysts have problems with the recycling of supports, and the carrier repetition rate is low. Expensive and not suitable for industrial mass production applications

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0033] Take the pesticide wastewater, adjust the pH to 3 with concentrated sulfuric acid, add ferrous sulfate and solid hydrogen peroxide in 3 batches gradually, to ensure that the total molar ratio of ferrous sulfate and hydrogen peroxide is 1:1, and stir for 30 minutes; Finally, ferrous ions are oxidized to trivalent iron, then picolinic acid is added, the molar ratio of the two is 1:1, and the reaction is stirred for 10 minutes to obtain an iron complex; then hydrogen peroxide is added in 3 batches gradually to ensure that the iron complex The molar ratio of compound to hydrogen peroxide is 1:1, the oxidation reaction is continued for 60-100min, and the final COD removal rate reaches 82%.

Embodiment 2

[0035] The difference between this embodiment and Example 1 is that after adding picolinic acid and reacting for 10 minutes, ultraviolet light irradiation was added to the reaction. The final COD removal rate increased by 8% compared with Example 1, reaching 90%.

Embodiment 3

[0037] This embodiment is different from Example 1 in that the complexing agent is porphyrin, the molar ratio of porphyrin to ferric iron is 1:3, and the complexation reaction is maintained for 15 minutes. The final COD removal rate reached 84%.

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PUM

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Abstract

A high-efficiency organic waste water degrading method is disclosed. The method includes steps of adding a complexing agent after all ferrous ions are oxidized into ferric ions on the basis of a traditional Fenton reaction; and after a complexing reaction, adding hydrogen peroxide to allow a Fenton-like reaction between the hydrogen peroxide and an iron complex compound under ultraviolet radiation to occur so as to continuously generate hydroxyl radicals. According to the method, through combination of the traditional Fenton reaction and the Fenton-like reaction of the iron complex compound and ferric ions, the reaction pH range is wide, the application range is wide, the total iron amount of the reactions is less than the iron adding amount in the traditional Fenton reaction, iron ion cyclic effects are superior to those of the traditional Fenton reaction, the utilization rate is high, the amount of sludge is low, operation is simple, degradation effects are good, the cost is low and operation is convenient. The method can be used for treating pharmaceutical waste water, pesticide waste water, printing and dyeing waste water, and the like. The waste water COD removing rate after treatment can be 89% or above. The method has a good application prospect.

Description

technical field [0001] The invention belongs to the technology of environmental protection, and in particular relates to a novel process for efficiently degrading organic waste water. Background technique [0002] Advanced oxidation technology is widely used in the removal of refractory organic pollutants in water. Among them, Fenton oxidation technology is considered to be one of the most economical, efficient and promising oxidation treatment technologies. by H 2 o 2 with Fe 2+ The reason why the oxidation system that constitutes the Fenton method can efficiently oxidize refractory pollutants is that hydroxyl radicals (·OH) are generated during the oxidation system. In order to generate a sufficient amount of hydroxyl radicals, it is necessary to ensure that the system maintains an ideal concentration of H 2 o 2 with Fe 2+ . for H 2 o 2 The ideal concentration can be achieved by continuously supplying H to the system 2 o 2 way to obtain and maintain. Fe exists...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/72
CPCC02F1/32C02F1/722C02F1/725
Inventor 王怡红李辰茹刘勤尧姚琛
Owner SOUTHEAST UNIV
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