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Rotating reaction generator and method for repairing organic contaminated soil based on photocatalysis of rotating reaction generator

An organic pollution, rotary technology, applied in the field of organic pollutant remediation, can solve the problem of slow photochemical reaction, achieve the effect of mechanized production, low investment cost and enhanced mass transfer efficiency

Inactive Publication Date: 2016-07-27
HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is one of the important reasons why the photochemical reaction of organic pollutants in soil is slow, which limits the application of photochemical technology in soil remediation.

Method used

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  • Rotating reaction generator and method for repairing organic contaminated soil based on photocatalysis of rotating reaction generator

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Experimental program
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Effect test

Embodiment 1

[0032] Use metatitanic acid as raw material, first use alkaline solution (NH 4 OH aqueous solution, NaOH aqueous solution or a combination of the two) to neutralize the metatitanic acid, adjust its pH to 7-9, then add iron oxide to the metatitanic acid at a mass ratio of 1:100, and use hot air to dissolve the metatitanic acid Acid spray drying yielded spherical particles, which were then sintered at 500°C for 2 hours to yield TiO 2 Powder (iron-doped mesoporous nano-titanium dioxide nanoparticles). The TiO 2 The powder has hierarchical porous secondary particles and a large specific surface area, which is an economical and efficient TiO 2 powder.

Embodiment 2

[0034] P-nitrophenol (PNP) and pentachlorophenol (PCP) were selected as target pollutants to study the photochemical process of phenolic pollutants in soil. First pass the contaminated soil sample through a 100-mesh sieve to remove gravel and large particle debris, adjust the pH of the soil to 6.5, and the moisture content to 50%, and add 2% of homemade TiO 2 powder. After the treatment is completed, add a rotary reaction generator, set the rotation speed to 50r / min, and the reaction time to 12h. After the reaction, the initial concentration of PNP dropped from 100mg / kg to 21.2mg / kg, and the photoconversion rate was 71.8%. After continuing the reaction for 12 hours, the concentration dropped to 13.7mg / kg, and the photoconversion rate was 86.3%. From 100mg / kg to 23.7mg / kg, the photoconversion rate was 76.3%. After continuing the reaction for 12 hours, the concentration dropped to 3.5%, and the photoconversion rate was 96.5%.

Embodiment 3

[0036] Benzo[a]pyrene (BaP) was selected as the target pollutant to study the photochemical process of polycyclic aromatic hydrocarbons (PAHs) in soil. Benzo[a]pyrene (BaP) is a typical macromolecular PAH with a 5-ring structure. It is one of the most potentially carcinogenic PAHs and one of the most studied pollutants. First pass the contaminated soil sample through a 100-mesh sieve to remove gravel and large particle debris, adjust the pH of the soil to 6.3, and the moisture content to 35%, and add 2% self-made TiO 2 powder. After the treatment is completed, add a rotary reaction generator, set the rotation speed to 50r / min, and the reaction time to 12h. After the reaction, the initial concentration of PNP dropped from 100mg / kg to 67.3mg / kg, and the photoconversion rate was 32.7%. , the concentration decreased to 38.4mg / kg, and the photoconversion rate was 61.6%. After 96 hours of reaction, the concentration decreased to 12.3mg / kg, and the photoconversion rate was 87.7%.

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Abstract

The invention discloses a rotating reaction generator and a method for repairing organic contaminated soil based on photocatalysis of the rotating reaction generator. The rotating reaction generator comprises an operation panel, a motor and a rotary stirring cylinder; stirring blades are arranged on the inner wall of the rotary stirring cylinder; and an ultraviolet lamp rod is arranged in a shaft core in the rotary stirring cylinder. The method for repairing the organic contaminated soil by the rotating reaction generator comprises the following steps: after iron-doped mesoporous nanometer titanium dioxide particles are mixed in the organic contaminated soil, the organic contaminated soil is added in the rotary stirring cylinder of the rotating reaction generator; the motor and the ultraviolet lamp rod are started; and the motor drives the rotary stirring cylinder to rotate, so that the organic contaminated soil is fully mixed under the effect of the stirring blades for ultraviolet photocatalysis reaction. The rotating reaction generator can enable the soil to fully contact with ultraviolet rays to accelerate quick and effective photocatalytic degradation of organic matters in the organic contaminated soil, so that the quick and effective repair of the organic contaminated soil is realized.

Description

technical field [0001] The invention relates to a device for photocatalytic restoration of organic polluted soil and a method for photocatalytic restoration of organic polluted soil by using the device, belonging to the technical field of organic pollutant restoration. Background technique [0002] Photocatalytic reaction refers to a photochemical reaction induced by light between photocatalysts and their surface adsorbates or organic substances. Photocatalysts mainly refer to some semiconductor substances, which generate photo-generated carriers, photo-induced holes and photo-generated electrons after absorbing light of a certain wavelength. High active oxygen radicals may directly undergo redox reactions with organic matter on the surface. [0003] Photocatalytic reactions are an important form of abiotic transformation of organic pollutants in soil, and a great deal of work has been done in this field since the beginning of research in this field in the 1970s. The initi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李智靳菁罗文连贺治国周洁王子规
Owner HUNAN HENGKAI ENVIRONMENT TECH INVESTMENT CO LTD
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