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Method for polycyclic aromatic hydrocarbons in wastewater through acetaldehyde intensified photodegradation

A polycyclic aromatic hydrocarbon and photodegradation technology, which is applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc., can solve the problem of high photocatalyst addition, easy to cause harm to people, and low photocatalytic efficiency and other problems, to achieve the effect of improving photocatalytic effect, good photosensitive activity and improving decomposition efficiency

Active Publication Date: 2020-01-14
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the low photocatalytic efficiency used in the method of photodegrading polycyclic aromatic hydrocarbons in wastewater in the prior art, the ultraviolet light intensity used in it is extremely high and it is easy to cause harm to people, and at the same time, the amount of photocatalyst added needs to be relatively low. High defects, providing a method for acetaldehyde-enhanced photodegradation of polycyclic aromatic hydrocarbons in wastewater, which can rapidly degrade polycyclic aromatic hydrocarbons in water under low ultraviolet light intensity without adding excessive photocatalysts

Method used

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  • Method for polycyclic aromatic hydrocarbons in wastewater through acetaldehyde intensified photodegradation

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Embodiment 1

[0036] A method for acetaldehyde-enhanced photodegradation of polycyclic aromatic hydrocarbons in wastewater, said method comprising the following steps:

[0037] (1) Micro-oxidation treatment: Add 0.035% hydrogen peroxide of wastewater quality to the wastewater containing 2800ppm polycyclic aromatic hydrocarbons, and stir for 45 minutes to obtain micro-oxidation wastewater;

[0038] (2) Pretreatment solution preparation: add 800ppm of acetaldehyde to the micro-oxidation wastewater to obtain a pretreatment solution;

[0039] (3) Ultraviolet photocatalysis: Pass the pretreatment liquid into a container with a multi-layer photocatalytic plate inside, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 100uW / cm 2 UV light for 25 minutes to obtain degraded wastewater.

[0040] The preparation method of the catalytic plate is as follows:

[0041] (S.1) Preparation of rare earth-containing airgel: After stirring and mixing tetraethoxysilane,...

Embodiment 2

[0051] A method for acetaldehyde-enhanced photodegradation of polycyclic aromatic hydrocarbons in wastewater, said method comprising the following steps:

[0052] (1) Micro-oxidation treatment: Add 0.045% hydrogen peroxide of wastewater quality to the wastewater containing 1800ppm polycyclic aromatic hydrocarbons, and stir for 35 minutes to obtain micro-oxidation wastewater;

[0053] (2) Pretreatment solution preparation: add 500ppm of acetaldehyde to the micro-oxidation wastewater to obtain a pretreatment solution;

[0054] (3) Ultraviolet photocatalysis: Pass the pretreatment liquid into a container with a multi-layer photocatalytic plate inside, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 115uW / cm 2 UV light for 25 minutes to obtain degraded wastewater.

[0055] The preparation method of the catalytic plate is as follows:

[0056] (S.1) Preparation of rare earth-containing airgel: After stirring and mixing tetraethoxysilane,...

Embodiment 3

[0066] A method for acetaldehyde-enhanced photodegradation of polycyclic aromatic hydrocarbons in wastewater, said method comprising the following steps:

[0067] (1) Micro-oxidation treatment: Add 0.001% hydrogen peroxide of wastewater quality to the wastewater containing 2500ppm polycyclic aromatic hydrocarbons, and stir for 30 minutes to obtain micro-oxidation wastewater;

[0068] (2) Pretreatment solution preparation: add 300ppm of acetaldehyde to the micro-oxidation wastewater to obtain a pretreatment solution;

[0069] (3) Ultraviolet photocatalysis: Pass the pretreatment liquid into a container with a multi-layer photocatalytic plate inside, and then irradiate the container with a wavelength of 254nm and an irradiation intensity of 80~120uW / cm 2 UV light for 10 minutes to obtain degraded wastewater.

[0070] The preparation method of the catalytic plate is as follows:

[0071] (S.1) Preparation of rare earth-containing airgel: After stirring and mixing tetraethoxysila...

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Abstract

The invention relates to the field of sewage treatment and in particular relates to a method for polycyclic aromatic hydrocarbons in wastewater through acetaldehyde intensified photodegradation. The method comprises the following steps: (1) adding a certain amount of hydrogen peroxide into wastewater with polycyclic aromatic hydrocarbons, performing stirring for a certain time so as to obtain micro-oxidation wastewater; (2) adding a certain amount of an acetaldehyde solution into the micro-oxidation wastewater so as to obtain a pretreatment liquid; and (3) introducing the pretreatment liquid into a container which is internally provided with a multi-layer photocatalysis plate, and performing ultraviolet radiation on the container for a certain time, so as to obtain degradation wastewater.By adopting the method, defects that in the prior art, the photocatalytic efficiency of photocatalysis in a method for polycyclic aromatic hydrocarbons in wastewater is low, ultraviolet light of photocatalysis is very high in intensity and harm can be done to people, and meanwhile, the addition amount of a photocatalyst is large, can be solved, so that the method has the advantage that organic dyes in water can be rapidly degraded under a low ultraviolet light intensity; meanwhile, the addition content of a photocatalysis promoter can be low; and the photocatalysis efficiency is not degraded along with time.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for acetaldehyde-enhanced photodegradation of polycyclic aromatic hydrocarbons in wastewater. Background technique [0002] Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) are compounds containing two or more benzene ring structures in their molecules. PAHs are also the first chemical carcinogens to be successfully tested in animal experiments. In 1915, Japanese scholars Yamagiwa and Ichikawa used polycyclic aromatic hydrocarbons in coal tar. Before the 1950s, polycyclic aromatic hydrocarbons were considered to be the most important carcinogens, and after the 1950s, they were one of the various types of carcinogens. But in general, it still has a very important position in carcinogens, because it is still the largest class of carcinogens so far, and it is widely distributed. It exists in air, soil, water and plants, and even 3,4-benzopyrene is...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/72C02F101/32
CPCC02F1/32C02F1/722C02F1/725C02F2305/10C02F2101/327
Inventor 徐焕志高佳俊张保平吴亦茹姚冰
Owner ZHEJIANG OCEAN UNIV
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