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Microwave repair equipment for organic contaminated soil

An organic pollution and microwave technology, which is applied in the restoration of polluted soil, separation methods, and dispersed particle separation, etc., can solve the problems of incomplete treatment of organic tail gas, secondary pollution by combustion method, and remediation of organically polluted soil, so as to eliminate tail gas. The effect of secondary pollution problem, reducing energy consumption and improving start-up speed

Active Publication Date: 2012-12-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing microwave heating equipment cannot be used for remediation of organic contaminated soil.
[0005] The thermal remediation process of organic polluted soil will produce different concentrations of organic tail gas. At present, methods such as combustion, adsorption or absorption are commonly used to treat organic tail gas. These methods are often only for low-concentration organic tail gas, and the treatment of medium-high concentration organic tail gas is not thorough. Simultaneous combustion method is easy to produce secondary pollution

Method used

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  • Microwave repair equipment for organic contaminated soil

Examples

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Effect test

example 1

[0031]For microwave remediation of easily hydrolyzed organic-contaminated soil, the organic-contaminated soil represented by chlorpyrifos is selected as the remediation object, and the concentration of chlorpyrifos in the organic-contaminated soil is 420mg / kg. The pretreated organic polluted soil passes through the mesh screen, and then enters the microwave remediation equipment of the organic polluted soil through the feeding port. The power of the first microwave generator was adjusted to 30kW, the average microwave irradiation time that the soil received dynamically in the furnace body was 30min, the soil temperature was maintained at about 200°C, and the removal rate of chlorpyrifos in the soil at the discharge port reached 96%. The gas flow rate before the microwave catalytic pyrolysis tower is 10m 3 / h, the power of the second microwave generator is adjusted to 10kw, the catalyst is Hopcalite catalyst, the temperature in the tower is maintained at about 350°C, and the ga...

example 2

[0033] For the microwave remediation of volatile / semi-volatile organic contaminated soil, the organic contaminated soil represented by nitrophenol was selected for the remediation test, and the concentration of nitrophenol in the organic contaminated soil was 480mg / kg. The pretreated organic polluted soil passes through the mesh screen, and then enters the microwave remediation equipment of the organic polluted soil through the feeding port. The power of the first microwave generator is adjusted to 45kW, the average microwave irradiation time that the soil dynamically accepts in the furnace body is 30min, the soil temperature is maintained at about 300°C, and the removal rate of nitrophenol in the soil at the discharge port reaches 98%. . The gas flow rate before the microwave catalytic pyrolysis tower is 10m 3 / h, the power of the second microwave generator is adjusted to 5kw, the catalyst is Hopcalite catalyst, the temperature in the tower is maintained at about 350°C, and ...

example 3

[0035] For the microwave remediation of refractory organic contaminated soil, chloramphenicol was selected as the representative organic contaminated soil for the remediation test, and the concentration of chloramphenicol in the organic contaminated soil was 120mg / kg. After the pretreated organic polluted soil is pretreated by the mesh screen, it enters the microwave remediation equipment of the organic polluted soil through the feeding port. The power of the first microwave generator is adjusted to 80kW, the average microwave irradiation time that the soil dynamically accepts in the furnace body is 30min, the soil temperature is maintained at about 500°C, and the degradation rate of chloramphenicol in the soil at the discharge port reaches 80%. . The gas flow rate before the microwave catalytic pyrolysis tower is 10m 3 / h, the second microwave generator is not turned on, the catalyst is Hopcalite catalyst, the temperature in the tower is maintained at about 600°C, and the ga...

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Abstract

The invention discloses microwave repair equipment for organic contaminated soil. The equipment comprises a charging and discharging system, a microwave heating system, a deduster, a tail gas treating system and a control system center, wherein, the charging and discharging system is arranged in the microwave heating system, and the microwave heating system, the deduster and the tail gas treatingsystem are connected sequentially. The microwave heating system comprises a first microwave generator and a cylindrical oven body, the inner layer of the cylindrical oven body is a silicon carbide layer, and the external layer of the cylindrical oven body is an alumina silicate heat-insulation layer; the tail gas treating system comprises a microwave catalytic pyrolysis tower and an adsorption tower, the microwave catalytic pyrolysis tower comprises a cylindrical alumina silicate insulation shell, multilayer silicon carbide porous filter boards and a catalyst, the multilayer silicon carbide porous filter boards are vertically inserted in the cylindrical alumina silicate insulation shell at equal distance, and the catalyst is arranged on the silicon carbide porous filter boards. The microwave repair equipment provided in the invention has the advantages of strong capability in treating organic contaminated soil, thorough treatment of tail gas, no secondary pollution, high efficiency, energy conservation and easy operation and control.

Description

technical field [0001] The invention relates to a microwave repairing device, more specifically, the invention relates to a microwave repairing device for organic polluted soil. Background technique [0002] In recent years, with the continuous acceleration of my country's urbanization process, a large number of pesticide factories and chemical factories have been closed or relocated, leaving a large number of chemical pollution sites around the city. A large part of the sites are high-concentration and highly toxic organic pollution sites, which pose a serious threat to the safety of the living environment. Therefore, it is urgent to remediate the soil of these organically polluted sites. [0003] Thermal remediation technology is a remediation technology for organically polluted soil that has developed rapidly abroad in recent years. Soil thermal remediation equipment generally uses diesel as fuel for direct or indirect heating, resulting in expensive soil remediation. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/06B01D53/88B01D53/70
Inventor 陆晓华王琳玲陈静曹梦华周海燕王力
Owner HUAZHONG UNIV OF SCI & TECH
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