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In-situ remediation method for petroleum-contaminated soil

An in-situ remediation and oil pollution technology, applied in the field of contaminated soil treatment, can solve the problems of great influence on soil physical and chemical properties, high energy consumption of incineration technology, etc., and achieve the effect of improving the effect

Inactive Publication Date: 2020-08-07
尤宝旺
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the incineration technology in the heat treatment technology has problems such as high energy consumption and great impact on the physical and chemical properties of the soil, which are the challenges faced by the current heat treatment and remediation of oil-contaminated soil.

Method used

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  • In-situ remediation method for petroleum-contaminated soil
  • In-situ remediation method for petroleum-contaminated soil
  • In-situ remediation method for petroleum-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as Figure 1~4Shown, a kind of oil-contaminated soil in-situ remediation method in the method of the present invention comprises the following steps:

[0040] Step 1, deep excavate the land to be processed at least twice, the depth of digging is 0.4-0.6m, and remove the gravel in the land to be processed;

[0041] Step 2, use the excavation part of the traveling soil treatment device to dig out 5-20cm thick surface soil and preheat the soil to crush, sieve and pyrolyze to obtain the pyrolysis mixture. The solution treatment device is parked once every 5-15m. During the parking process, the high-pressure spraying part of the traveling soil treatment device is used to spray the microbial treatment solution at least 15cm deep into the soil at a fixed distance;

[0042] Step 3, using a spreader to spread the pyrolysis mixture on the ground treated by the high-pressure spraying part, the laying width and laying thickness are suitable for the width and thickness of the ...

Embodiment 2

[0063] Step 1, deep excavate the land to be processed at least twice, the depth of digging is 0.4m, and remove the gravel in the land to be processed;

[0064] Step 2, use the excavation part of the traveling soil treatment device to dig out 5-10cm thick surface soil and preheat the soil for crushing, screening and pyrolysis to obtain the pyrolysis mixture. The solution treatment device is parked once every 5-6m, and during the parking process, the high-pressure spraying part of the traveling soil treatment device is used to spray the microbial treatment solution once in the soil at a fixed distance of 15-20cm;

[0065] Step 3, using a spreader to spread the pyrolysis mixture on the ground treated by the high-pressure spraying part, the laying width and laying thickness are suitable for the width and thickness of the excavated surface soil in step 2;

[0066] Step 4, when the surface temperature of the pyrolysis mixture in step 3 is reduced to 45-48°C, cover it with thermal in...

Embodiment 3

[0073] Step 1, deep excavate the land to be processed at least twice, the depth of digging is 0.5m, and remove the gravel in the land to be processed;

[0074]Step 2: Excavate 10-13cm thick surface soil by using the excavation part of the traveling soil treatment device, and perform preheating, crushing, screening and pyrolysis treatment on the soil to obtain a pyrolysis mixture. The solution treatment device is parked once every 8-10-13m, and during the parking process, the high-pressure spraying part of the traveling soil treatment device is used to spray the microbial treatment solution once in the soil at a fixed distance of 20-25cm;

[0075] Step 3, using a spreader to spread the pyrolysis mixture on the ground treated by the high-pressure spraying part, the laying width and laying thickness are suitable for the width and thickness of the excavated surface soil in step 2;

[0076] Step 4, when the surface temperature of the pyrolysis mixture in step 3 is reduced to 40-45°...

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Abstract

The invention discloses an in-situ remediation method for petroleum-contaminated soil. The in-situ remediation method comprises the following steps: 1, deeply ploughing a to-be-treated land parcel forat least two times, and removing gravels in the to-be-treated land parcel; 2, digging surface soil, carrying out pyrolysis treatment on the soil to obtain a pyrolysis mixture, and simultaneously carrying out fixed-distance deep soil high-pressure spraying once by adopting a high-pressure spraying part of an advancing type soil treatment device while carrying out pyrolysis treatment; 3, flatly laying the pyrolysis mixture on the ground treated by the high-pressure spraying through a distributing device; 4, when the surface layer temperature of the pyrolysis mixture in step 3 is reduced to be lower than 50 DEG C, carrying out heat preservation plastic film mulching treatment for at least 15 days; and 5, repeating steps 2-4 until the concentration of petroleum in the soil with the depth of 0-50 cm of the to-be-treated land parcel is lower than a restoration target value. According to the in-situ remediation method for the petroleum-contaminated soil, a physical method and a biological method can be combined to carry out layered treatment on the petroleum-contaminated soil, so the treatment effect is effectively improved.

Description

technical field [0001] The invention relates to the technical field of contaminated soil treatment, in particular to an in-situ restoration method for petroleum-contaminated soil. Background technique [0002] At present, the remediation technologies for oil-contaminated soil mainly include bioremediation, leaching and heat treatment technologies. Bioremediation has the advantages of simple operation, low cost and less secondary pollution, but it can only treat low-concentration petroleum-contaminated soil and the treatment period is long, and it cannot effectively degrade heavy petroleum components such as colloids and asphaltene; the leaching method It has the disadvantages that it is difficult to separate the eluate from the soil, it is difficult to adapt to the sticky soil, and the eluate needs further treatment. Thermal treatment technology has significant advantages such as high remediation efficiency and good adaptability to the types and concentrations of organic po...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10B09C1/06
CPCB09C1/00B09C1/06B09C1/10B09C2101/00
Inventor 尤宝旺
Owner 尤宝旺
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