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Method for acetone intensified photodegradation on polycyclic aromatic hydrocarbons in wastewater

A polycyclic aromatic hydrocarbon, photodegradation technology, applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc. and other problems, to achieve the effect of improving the photocatalytic effect, good photosensitivity, and improving the decomposition efficiency.

Active Publication Date: 2020-01-24
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 an acetone-enhanced photodegradation method for polycyclic aromatic hydrocarbons in wastewater, which can rapidly degrade polycyclic aromatic hydrocarbons in water under the condition of low ultraviolet light intensity without adding excessive photocatalysts

Method used

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  • Method for acetone intensified photodegradation on polycyclic aromatic hydrocarbons in wastewater

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Embodiment 1

[0037] A method for acetone-enhanced photodegradation of polycyclic aromatic hydrocarbons in waste water, said method comprising the following steps:

[0038] (1) Micro-oxidation treatment: Introduce oxygen into the wastewater containing 2000ppm polycyclic aromatic hydrocarbons at a flow rate of 800mL / min for 2 hours to obtain oxygen-containing wastewater;

[0039] (2) Pretreatment solution preparation: add 1000ppm acetone to the oxygenated wastewater to obtain the pretreatment solution;

[0040] (3) Ultraviolet photocatalysis: Pass the pretreatment solution into a container with a multi-layer photocatalytic plate inside, and then irradiate with 254nm ultraviolet light for 20 minutes to obtain degraded wastewater with an irradiation intensity of 130uW / cm 2 .

[0041] The preparation method of the photocatalytic plate is as follows:

[0042] (S.1) Preparation of rare earth-containing airgel: Add tetraethoxysilane and rare earth powder to 150 parts of absolute ethanol at a mas...

Embodiment 2

[0047] A method for acetone-enhanced photodegradation of polycyclic aromatic hydrocarbons in waste water, said method comprising the following steps:

[0048] (1) Micro-oxidation treatment: Introduce oxygen into the wastewater containing 1000ppm polycyclic aromatic hydrocarbons at a flow rate of 500mL / min for 0.5h to obtain oxygen-containing wastewater;

[0049] (2) Pretreatment liquid preparation: add 300ppm acetone to the oxygenated wastewater to obtain the pretreatment liquid;

[0050] (3) Ultraviolet photocatalysis: Pass the pretreatment solution into a container with a multi-layer photocatalytic plate inside, and then irradiate it with 254nm ultraviolet light for 10 minutes to obtain degraded wastewater with an irradiation intensity of 120uW / cm 2 .

[0051] The preparation method of the photocatalytic plate is as follows:

[0052] (S.1) Preparation of rare earth-containing airgel: Add tetraethoxysilane and rare earth powder to 100 parts of absolute ethanol at a mass rat...

Embodiment 3

[0057] A method for acetone-enhanced photodegradation of polycyclic aromatic hydrocarbons in waste water, said method comprising the following steps:

[0058] (1) Micro-oxidation treatment: Introduce oxygen into the wastewater containing 3000ppm polycyclic aromatic hydrocarbons at a flow rate of 1500mL / min for 3 hours to obtain oxygen-containing wastewater;

[0059] (2) Pretreatment liquid preparation: add 1500ppm acetone to the oxygenated wastewater to obtain the pretreatment liquid;

[0060] (3) Ultraviolet photocatalysis: Pass the pretreatment liquid into a container with a multi-layer photocatalytic plate inside, and then irradiate with 254nm ultraviolet light for 30 minutes to obtain degraded wastewater with an irradiation intensity of 150uW / cm 2 .

[0061] The preparation method of the photocatalytic plate is as follows:

[0062] (S.1) Preparation of rare earth-containing airgel: Add tetraethoxysilane and rare earth powder to 200 parts of absolute ethanol at a mass rat...

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Abstract

The invention relates to the field of wastewater treatment and in particular relates to a method for acetone intensified photodegradation on polycyclic aromatic hydrocarbons in wastewater. The methodcomprises the following steps: introducing oxygen into wastewater with polycyclic aromatic hydrocarbons for a certain time so as to obtain oxygen-containing wastewater; adding a certain amount of acetone into the oxygen-containing wastewater so as to obtain a pretreatment solution; introducing the pretreatment solution into a container with multiple layers of photocatalytic plates; and irradiatingultraviolet light into the container for a certain time so as to obtain degraded wastewater. The method aims to overcome defects that in the prior art, a method for photodegradation on polycyclic aromatic hydrocarbons in wastewater is low in photocatalysis efficiency, ultraviolet light used in the method is very high in intensity and can do harm to people easily, and meanwhile, the addition amount of a photocatalyst is high; and the method has the advantages that the polycyclic aromatic hydrocarbons in the water can be rapidly degraded under a condition of a low ultraviolet light intensity, meanwhile, the addition amount of a photocatalysis promoter is low, and the photocatalysis efficiency is not degraded along with time.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an acetone-enhanced photodegradation method for 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 number of carcinogens, and it is widely distributed. It exists in air, soil, water and plants, and even 3,4-benzopyrene is isolated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/32C02F1/72C02F101/32
CPCC02F1/32C02F1/727C02F1/725C02F2101/327C02F2305/10
Inventor 徐焕志姚冰吴亦茹高佳俊张保平
Owner ZHEJIANG OCEAN UNIV
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