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Hot ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method

An in-situ remediation and contaminated soil technology, applied in the restoration of contaminated soil, etc., can solve the problems of technical research and engineering implementation gaps, etc., and achieve the effects of increasing desorption efficiency, increasing growth, and small site disturbance

Inactive Publication Date: 2021-05-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] At present, the existing technology has carried out individual technical research on in-situ remediation technologies such as groundwater aeration remediation technology (AS) and soil vapor extraction technology (SVE), and some field experiments have been carried out successively. However, the three technologies Through joint application, learn from each other's strengths to complement each other's strengths, and achieve complementary advantages, the combined restoration technology that improves the restoration effect of soil and groundwater organic pollutants is still blank in technical research and engineering implementation.

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  • Hot ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method
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  • Hot ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method

Examples

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Embodiment 1

[0065] This embodiment provides a kind of in-situ remediation device for thermally ventilated and strengthened petroleum hydrocarbon contaminated soil, such as Figure 1 ~ Figure 4 as shown,

[0066] include:

[0067] Vacuum extraction system, used to extract groundwater and soil gas in remediation wells, and remove volatile organic compounds; and blower injection skid, used to blow air into remediation wells and inject soil remediation agents to remove volatile and semi-volatile organic compounds ;

[0068] Such as figure 2 , the vacuum extraction system includes:

[0069] Vacuum pump 1 is connected with extraction well 7 for extracting groundwater and soil gas;

[0070] The gas-liquid separator 2, whose fluid inlet is connected to the vacuum pump, is used to separate the groundwater and soil gas extracted by the vacuum pump into gas-liquid;

[0071] Gas purification device 3 is used to remove the volatile organic compounds contained in the gas separated by the gas-liqu...

Embodiment 2

[0078] This embodiment provides a method for in-situ remediation of petroleum hydrocarbon-contaminated soil with heat-ventilated enhancement. The method uses the in-situ remediation device for heat-ventilated enhanced petroleum hydrocarbon-contaminated soil described in Example 1, including the following steps:

[0079] 1) On-site test is carried out in the storage tank landfill area, the site area is about 200m 2 (Length×Width, 20m×10m), samples were collected between each tank, a total of 6 point soil samples were collected, and the depth of samples collected at each point was 0 m, 0.5 m, 1.0 m, 1.5 m, 3.0 m m, 6.0 m, such as Figure 5 shown;

[0080] The direct push soil sampling equipment geoprobe was used to collect soil samples on site, and MIP (membrane interface probe) monitoring was carried out while drilling, and the pollutants were determined to be gasoline and diesel, and the pollutant concentration range was 1000-3500mg / kg; according to the on-site soil sample co...

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Abstract

The invention discloses a hot ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method which comprises the following steps: S1, determining the pollution range of a contaminated site and the concentration distribution of pollutants, and arranging an extraction well and an injection well; s2, performing soil vapor extraction remediation through a vacuum extraction system, and performing underground water aeration remediation and soil low-temperature thermal desorption in-situ remediation through a blast injection system; and S3, repeating the step S2 until the concentration of the pollutants in the contaminated site is reduced to 0.45%-5% of the original pollutant concentration, and completing in-situ remediation of the contaminated soil. According to the hot ventilation reinforced petroleum hydrocarbon contaminated soil in-situ remediation method provided by the invention, volatile and semi-volatile organic compounds in soil and underground water are removed in a manner of alternately operating SVE, AS and a hot air injection system for multiple times; the in-situ remediation technology has small disturbance on the site and is less affected by the ground, and the whole process has no secondary pollution.

Description

technical field [0001] The invention relates to the technical field of soil in-situ restoration. More specifically, it relates to a method for in-situ remediation of petroleum hydrocarbon-contaminated soils enhanced by thermal ventilation. Background technique [0002] Soil and groundwater pollution incidents caused by leakage of gas stations and refined oil depots are not uncommon. In 1995, Beijing Anjialou gas station leaked 78 tons of diesel oil, which leaked into the soil and groundwater within a week, causing a nearby water plant to shut down and affecting 36 kilometers of water supply; in 2006, Jiangsu Nanjing Longpan Road gas station A large number of leaks occurred. In the same year, the oil storage tank of Mitsui gas station leaked, and the leaked gasoline spread to the municipal sewer pipes; 29 gas stations in southern Jiangsu were tested for leaks, and 21 had leaks of varying degrees, accounting for 72.4 of the total number of investigations. %, 12 out of 20 gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/06B09C1/08B09C1/002B09C2101/00
Inventor 张坤峰宋权威陈昌照杜显元陈宏坤郑瑾孙继平
Owner BC P INC CHINA NAT PETROLEUM CORP
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