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Method for degrading tail gas generated by polybrominated-diphenyl-ether polluted soil restoration by thermal desorption technique

A polybrominated diphenyl ether and polluted soil technology is applied in the field of degrading the tail gas of the polybrominated diphenyl ether-contaminated soil repaired by thermal desorption technology, which can solve problems such as environmental pollution of the exhaust gas, and achieve the effects of efficient detection and rapid detection.

Active Publication Date: 2017-06-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the tail gas in the above thermal desorption technology pollutes the environment, the present invention aims to provide a method for degrading the tail gas of PBDE-contaminated soil repaired by thermal desorption technology

Method used

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  • Method for degrading tail gas generated by polybrominated-diphenyl-ether polluted soil restoration by thermal desorption technique
  • Method for degrading tail gas generated by polybrominated-diphenyl-ether polluted soil restoration by thermal desorption technique

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Embodiment 1

[0020] The preparation of embodiment 1 structured carrier

[0021] The 1060 type aluminum plate (99.6wt%) was treated with 10wt% NaOH and 10wt% HNO 3 After treatment for 4min and 2min, place it in an electrolytic cell filled with 0.4mol / L oxalic acid solution at 20°C with a current density of 50A / m 2 The anodized aluminum plate was anodized for 12 hours under certain conditions, and the obtained anodized aluminum plate was fired at 350°C for 1 hour, and then treated in deionized water at 80°C for 60 minutes. Finally, it is calcined at 500°C for 4 hours to obtain γ-Al 2 o 3 / Al plate catalyst.

Embodiment 2

[0022] The preparation of embodiment 2 supported copper catalysts (competitive adsorption method)

[0023] Using water as a solvent, prepare a 0.5mol / L acetic acid solution, and mix γ-Al 2 o 3 / Al was immersed in this solution for 4 hours at 25°C under constant stirring; after natural drying for 6 hours, placed in 1.5mol / L copper nitrate solution at 25°C and constant stirring for 12 hours, after natural drying for 12 hours, Put it in a muffle furnace and raise the temperature to 500°C at a heating rate of 5°C / min, and keep it for 4 hours to obtain Cu / γ-Al with a Cu content of 10.0wt%. 2 o 3 / Al catalyst.

Embodiment 3

[0024] Embodiment 3 loaded copper-nickel catalyst (competitive adsorption method loading Cu, electrolytic method loading Ni)

[0025] Cu / γ-Al at 25°C 2 o 3 / Al placed in 1mol / L copper nitrate solution, at a current density of 50A / m 2 Conduct DC electrolysis under conditions for 3 minutes, and after natural drying for 12 hours, place the temperature in a muffle furnace to 500°C at a rate of 5°C / min and keep it for 4h to obtain Cu / Ni / γ with 2.5wt% Ni content -Al 2 o 3 / Al catalyst.

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Abstract

The invention relates to a method for degrading tail gas generated by polybrominated-diphenyl-ether polluted soil restoration by a thermal desorption technique. The method comprises the following steps: automatically growing a nano-pore-structure aluminum oxide film on the surface of an aluminum matrix under electrochemical actions to form a structurized carrier; carrying at least one metal and / or metal oxide on the structurized carrier to form a structurized catalyst; restoring polybrominated-diphenyl-ether polluted soil by a thermal desorption technique to generate tail gas; and inserting the structurized catalyst into a microchannel reactor or filling a fixed-bed reactor with a mixture of the structurized catalyst and 20-40-mesh Raschig ring, and introducing the tail gas into the reactor to carry out reaction at the reaction temperature of 200-500 DEG C under atmospheric pressure, wherein the air speed is 1500-90000 mL / (g.h). The structurized catalyst is utilized to degrade the tail gas generated by polybrominated-diphenyl-ether polluted soil restoration by the thermal desorption technique, so that the tail gas reaches the discharge standard.

Description

technical field [0001] The invention relates to the technical field of environmental protection, and more specifically relates to a method for degrading the tail gas of polybrominated diphenyl ether-contaminated soil repaired by thermal desorption technology. Background technique [0002] Polybrominated diphenyl ethers (PBDEs) are a typical class of brominated flame retardants. Due to their good flame retardant properties, they are widely used in various industrial and daily products such as chemicals, building materials, textiles, and electronics. However, because it is added to the product in the form of an additive and does not form a chemical bond with the product itself, it is easily released from the product into the environmental medium during the production, use and disposal of the product. As persistent organic pollutants, polybrominated diphenyl ethers are persistent, refractory, bioaccumulative, biotoxic and long-distance transport, and they have been detected in ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/72B01J21/04B01J23/72B01J23/755B01J32/00B09C1/00
CPCB01D53/8662B01D2257/2062B01D2258/02B01J21/04B01J23/72B01J23/755B09C1/00
Inventor 张琪樊飞跃朱子彬朱学栋
Owner EAST CHINA UNIV OF SCI & TECH
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