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System for normal-temperature desorption treatment of volatile organic compound contaminated soil

A technology of desorption of volatile organic compounds at normal temperature, applied in the restoration of polluted soil, separation of dispersed particles, chemical instruments and methods, etc. Advanced problems, to achieve the effect of reducing the cost of subsequent hazardous waste treatment, increasing the scope of application, and increasing the specific surface area

Active Publication Date: 2021-06-22
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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  • System for normal-temperature desorption treatment of volatile organic compound contaminated soil
  • System for normal-temperature desorption treatment of volatile organic compound contaminated soil
  • System for normal-temperature desorption treatment of volatile organic compound contaminated soil

Examples

Experimental program
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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 speeding up 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 desorbed soil Transport to the discharge device and discharge;

[0097] The pollutant content in the soil before desorption is: ethylbenzene conc...

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Abstract

The invention discloses a system for normal-temperature desorption treatment of volatile organic compound contaminated soil. The system comprises a soil treatment unit; the soil treatment unit comprises a feeding device, a normal-temperature desorption device and a discharging device which are communicated in sequence; two ends of the normal-temperature desorption device are respectively communicated with a ventilation device and a tail gas treatment device; the normal-temperature desorption device comprises a supporting device, a roller stirrer supported by the supporting device and a power device for driving the roller stirrer to rotate; the tail gas treatment device comprises a dust removal device, a condensing device, an activated carbon canister, an induced draft fan and an exhaust device which are connected in sequence; the system further comprises a hot air fan and low-temperature plasma equipment. Two ends of the hot air fan are respectively communicated with the ventilation unit and the activated carbon canister; and two ends of the low-temperature plasma equipment are respectively communicated with the activated carbon canister and the exhaust device. According to the system, the application range of normal-temperature desorption can be widened, the soil treatment efficiency and treatment quality are improved, and safety and personnel safety are guaranteed.

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 Applications(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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