In-situ heating combined double-phase vacuum drawing soil restoration device and method

A technology of vacuum suction and soil remediation, applied in the restoration of polluted soil, etc., can solve the problems of high treatment cost, secondary pollution, unfavorable application, etc. Effect

Active Publication Date: 2013-04-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] Generally speaking, the early methods of treating oil-contaminated soil are mainly traditional physical (steam method, air pumping method, organic solvent method, hydraulic flushing method) and chemical methods (oxidation method, heat treatment method). Quick results, but there are disadvantages such as secondary pollution and high treatment costs, which are not conducive to wide application

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  • In-situ heating combined double-phase vacuum drawing soil restoration device and method

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Embodiment 1

[0029] First, conduct a site survey on the contaminated site to be treated, and determine that the area of ​​the contaminated site to be treated is about 200m 2 , the pollutants are mainly concentrated at 2-5m underground; the main pollutants are total petroleum hydrocarbons, the content can reach 1786~40167mg / kg; polycyclic aromatic hydrocarbons, the content can reach 26.10mg / kg, and the soil also contains mercury, which can reach 2~2.69mg / kg. The polluted site is left after the relocation of the production workshop of the pesticide chemical factory, and the site is square in shape. Utilize the method of the present invention to repair it, and concrete steps are as follows:

[0030] (1) Divide the contaminated site to be treated into four small squares on average, and set a heating well 4 at the center of each small square. The depth of the heating well is 6m, and the diameter is about 90cm. The heating well 4 is 2-6m underground. 2m long transverse conduits 10 are laid eve...

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Abstract

The invention discloses an in-situ heating combined double-phase vacuum drawing soil restoration device and method, and belongs to the technical field of environment protection. The structure of the in-situ heating combined double-phase vacuum drawing soil restoration device is that a resistance heating device is positioned in a heating well; a plurality of guide pipes with high heat conduction performance are arranged on the side wall of the heating well; a vacuum drawing well is positioned in a drawing well; the upper part of the vacuum drawing well is connected with a vacuum drawing pump; a gas treatment device is connected with a first-level separation device; the other end is connected with a conveying pump; a second-level separation device is connected with a conveying pump; a water treatment device and a liquid pollutant treatment device are respectively connected with the second-level separation device; and a power control device is connected with the resistance heating device, the vacuum drawing pump and the conveying pump 16. The method comprises the following steps of: arranging the heating well in a polluted land for heating soil so that pollutants are converted into small-molecule gas, drawing the pollutants to the ground through the vacuum drawing pump and the drawing well, and performing separation and harmless treatment. The in-situ heating combined double-phase vacuum drawing soil restoration device is simple in structure and convenient to operate; secondary pollution is avoided; and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an in-situ heating combined with two-phase vacuum suction soil restoration device and method. Background technique [0002] Since the reform and opening up, with the rapid development of industrialization in our country, the scale of cities has gradually expanded, thus making the urbanization process achieve unprecedented development. In the process of the continuous expansion of the city to the periphery, a large number of industrial enterprises located in the periphery and polluting have gradually become part of the central area of ​​the city; and the population in the central area of ​​the city is often highly concentrated, and these industrial enterprises with pollution risks are harmful to human health. and environmental security pose a great threat. In order to meet the requirements of improving the quality of the urban environment and optimizi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/06
Inventor 卢宏玮史斌何理张一梅
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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