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A system for desorption treatment of volatile organic compounds polluted soil at room temperature

A volatile organic compound and normal temperature desorption technology, applied in the field of environmental protection, can solve the problems that the treatment process is easily affected by the ambient temperature, the treatment effect of heavily polluted soil is not good, and cannot be effectively treated, so as to reduce the cost of subsequent hazardous waste treatment and increase the applicable The effect of improving range and efficiency

Active Publication Date: 2022-04-22
YONKER ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method occupies a large area and is not suitable for areas with tight land use; at the same time, personnel are required to operate in the workshop, which poses health risks to personnel; the activated carbon after treatment has a high concentration and needs to be treated as hazardous waste
At the same time, this method is mostly suitable for mildly volatile polluted soil. The treatment process is easily affected by the ambient temperature, and the treatment effect on heavily polluted soil is not good, and the soil temperature is low or the humidity is too high. It cannot be effectively treated.
At present, the treatment of heavily volatile polluted soil mostly adopts digging the soil away from the site for incineration, landfill, hydraulic flushing, etc., but there are problems such as high processing cost and easy to produce secondary pollution.

Method used

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  • A system for desorption treatment of volatile organic compounds polluted soil at room temperature
  • A system for desorption treatment of volatile organic compounds polluted soil at room temperature
  • A system for desorption treatment of volatile organic compounds polluted soil at room temperature

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Effect test

Embodiment 1

[0061] Such as figure 1 , figure 2 , image 3 As shown, the present invention provides a system for strengthening desorption at room temperature to treat soil polluted by volatile organic compounds. The present invention will be further described below in conjunction with the accompanying drawings.

[0062] The invention provides a system for treating volatile organic compound polluted soil by desorption at room temperature, and its working process is as follows: figure 1 As shown, polluted soil and auxiliary materials enter the normal temperature desorption equipment through the feeding device for mixing and stirring, input hot air or dry air through the ventilation device to desorb volatile organic pollutants, the soil is dispensed through the discharge device, and the organic pollutants pass through the tail gas treatment device Deal with up-to-standard emissions. In addition, the fully adsorbed activated carbon is regenerated in situ through the hot air desorption of t...

Embodiment 2

[0081] The method of treating contaminated soil (benzene) of the type of volatile organic compounds (VOCs) using the above system is:

[0082] Include the following steps:

[0083] (1) The contaminated soil and auxiliary materials are input into the normal temperature desorption device through the feeding device, the contaminated soil is rolled and stirred in the cylinder, and moves to the discharge device. The inner diameter of the drum is 1.5m, the length is 15m, the inclination angle is 1.5°, and the drum speed is 2.5r / min , the residence time is 0.5h; the ventilation system blows normal temperature air from the drum vent of the normal temperature desorption device, the air contacts the soil in reverse, desorbs volatile organic compounds, and the desorbed soil is transported to the discharge device and discharged;

[0084] The pollutant content in the soil before desorption is: benzene concentration 47.67mg / kg.

[0085] The soil after desorption needs to meet the requireme...

Embodiment 3

[0094] The ambient temperature is lower than 15°C, and the ethylbenzene-contaminated soil with a moisture content of 35% is treated as follows:

[0095] Include the following steps:

[0096] (1) Input the contaminated soil and auxiliary materials into the normal temperature desorption device through the feeding device, the addition ratio of auxiliary materials is 1~3%, the contaminated soil is rolled and stirred in the drum, and moves to the feeding device; the drum speed is 1.25r / min, and the residence time is 1h. The outer side of the drum is wrapped with an insulation layer. By increasing the speed of the stirring shaft and increasing the disturbance, the ventilation system blows dry air at 40~50°C from the drum vent of the normal temperature desorption device. The air contacts the soil in reverse, desorbs volatile organic compounds, and the soil after desorption Transport to the discharge device and discharge;

[0097] The pollutant content in the soil before desorption i...

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Abstract

The invention discloses a system for treating volatile organic compound polluted soil by desorption at normal temperature. The system comprises a soil treatment unit; the soil treatment unit comprises a feeding device, a desorption device at normal temperature and a discharge device connected in sequence; The two ends of the device are respectively communicated with the ventilation device and the tail gas treatment device; the normal temperature desorption device includes a support device, a drum agitator supported by the support device, and a power device that drives the drum agitator to rotate; the tail gas treatment device includes sequentially connected dedusting device, condensing device, activated carbon tank, induced draft fan and exhaust device; the system also includes a hot air fan and low-temperature plasma equipment; the two ends of the hot air fan are respectively connected with the ventilation unit and the activated carbon tank; Connects to charcoal canister and exhaust. The system of the invention can increase the scope of application of desorption at normal temperature, improve the efficiency and quality of soil treatment, and ensure the safety and safety of personnel.

Description

technical field [0001] The invention relates to a system for desorbing soil polluted by volatile organic compounds at normal temperature, and belongs to the technical field of environmental protection. Background technique [0002] Volatile organic pollutants are typical soil pollutants and are the most common pollutants emitted by industries such as petroleum, chemical, pharmaceutical, printing, building materials, and spraying. As a special class of soil pollutants, volatile organic compounds have different pollution characteristics from other pollutants. Due to the mixed coexistence of various organic compounds, there are synergistic and antagonistic effects between them, and the concentration of each single volatile organic compound is low. When the concentration is limited, if the total concentration of volatile organic compounds reaches a certain value, it will still cause harm to the human body. Especially the mixed existence of various volatile organic compounds wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/06B01D53/04B01D53/00B01D49/00
CPCB09C1/00B09C1/065B01D53/04B01D53/002B01D49/00
Inventor 周虹胡培良杨旺刘广秦香
Owner YONKER ENVIRONMENTAL PROTECTION
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