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Method for treating low-boiling-point volatile organic contaminated soil through carbon dioxide

A volatile organic, polluted soil technology, applied in the restoration of polluted soil, air quality improvement, etc., to achieve the effect of reducing treatment costs, simple equipment, and improving treatment efficiency

Pending Publication Date: 2022-06-03
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the above-mentioned background technology, the present invention aims to propose a method for utilizing carbon dioxide to treat low-boiling point volatile organic-contaminated soil, which can fill in the technical deficiency of in-situ treatment of soil containing a large amount of low-boiling point volatile organic compounds, and at the same time contribute to the exploration The treatment of soil containing volatile organic compounds has practical significance

Method used

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  • Method for treating low-boiling-point volatile organic contaminated soil through carbon dioxide
  • Method for treating low-boiling-point volatile organic contaminated soil through carbon dioxide
  • Method for treating low-boiling-point volatile organic contaminated soil through carbon dioxide

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Embodiment 1

[0057] The site to be treated is the leftover site of the gas station, with a site area of ​​1500m2 2 , the average water content is 30%, the depth to be treated is 1m, the volatile organic compounds in the soil are mainly benzene, accounting for 70% of the total volatile organic compounds in the soil, the concentration is 60mg / kg, and the boiling point is 80.1 ℃; the site is divided into a side length of 1m The thickness of the inserted isolation barrel is 5mm, and the insertion depth is 1.3m; the configuration amount of the mixed material is 20% of the total amount of soil in the grid, and the mixed material accounts for 80 parts of active magnesium oxide and 20 parts of quicklime. The stirring time with the soil to be treated is 3 minutes; the insertion depth of the gas injection pipe is 1.1m; the sensor is buried at a depth of 0.3m below the surface, and 2 temperature sensors and 2 concentration sensors are set; after aeration, the ventilation time is 1 hour, and ventilatio...

Embodiment 2

[0059] The site to be treated is the site left over from the rubber factory, with a site area of ​​6000m2 2 , the average moisture content is 50%, the depth to be treated is 2m, the volatile organic compounds in the soil are mainly dichloroethane, accounting for 60% of the total volatile organic compounds in the soil, the concentration is 120 mg / kg, and the boiling point is 83.7 ℃; the site is divided into A square grid with a side length of 2m, the thickness of the inserted isolation barrel is 10mm, and the depth of insertion is 2.5m; the amount of mixed material is 30% of the total soil in the grid, and the mixed material accounts for 50 parts of active magnesium oxide and 50 parts of quicklime , the mixing time of the mixed material and the soil to be treated is 5 minutes; the insertion depth is 2.3m; the sensor is buried at a depth of 1.3m below the surface, and 4 temperature sensors and 4 concentration sensors are set; after aeration, the ventilation time is 6 hours, Vent...

Embodiment 3

[0061] The site to be treated is the leftover site of the acetylene plant, with a site area of ​​4000m2 2, the average moisture content is 40%, the depth to be treated is 1.5m, the volatile organic compounds in the soil are mainly 1,2-dichloroethylene, accounting for 75% of the total volatile organic compounds in the soil, the concentration is 700 mg / kg, and the boiling point is 47.67 ℃ ; The site is divided into a square grid with a side length of 1.5m, the thickness of the inserted isolation barrel is 7mm, and the depth of insertion is 1.9m; ​​the amount of mixed material is 22% of the total soil in the grid, and the active magnesium oxide in the mixed material accounts for 20 parts , Quicklime accounts for 80 parts, and the mixing time between the mixed material and the soil to be treated is 5 minutes; the insertion depth of the gas injection pipe is 1.7m; each group of sensors is buried at a depth of 0.75m below the surface, with 3 temperature sensors and 3 concentration se...

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Abstract

The invention discloses a method for treating low-boiling-point volatile organic contaminated soil through carbon dioxide. The method comprises the working procedures of site pretreatment, material preparation, site construction, soil remediation and the like. The method comprises the following steps: uniformly mixing a mixture of active magnesium oxide powder and quicklime powder into the volatile organic contaminated soil, and carrying out a violent chemical reaction with subsequently introduced carbon dioxide to generate a relatively high temperature and release a large amount of heat so as to promote rapid pumping and removal of high-concentration volatile organic pollutants in the soil; the gel generated by the carbonization reaction not only bonds the soil particles, but also wraps and seals the residual low-concentration organic pollutants in the soil. The volatile organic pollutants in the soil can be efficiently treated within a short time through the dual effects of high-temperature pumping and discharging removal and wrapping and sealing of the cement. According to the method, the low-carbon cementing material magnesium oxide is utilized, remediation application of carbon dioxide in volatile organic contaminated soil is achieved, and the method has the advantages of being low in energy consumption, high in treatment efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of soil ecological environment restoration, and in particular relates to a method for in-situ treatment of soil containing volatile organic compounds using carbon dioxide. Background technique [0002] Volatile organic compounds (VOCs) refer to organic compounds with a boiling point lower than 260°C under standard atmospheric pressure, mainly including alkanes, hydrocarbons, esters, alcohols and benzene series. Most VOCs are toxic to a certain extent and can easily cause damage to human skin, blood and respiratory system; at the same time, VOCs are also recognized as PM2.5 precursors, which will cause serious air pollution when discharged in large quantities. In the early stage of China's industrialization construction, due to the lack of awareness of environmental protection, a large number of VOCs were immersed in the soil, forming volatile organic compound-contaminated soil under long-term geological acti...

Claims

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Application Information

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IPC IPC(8): B09C1/00
CPCB09C1/00Y02A50/20
Inventor 蔡光华钟煜清刘松玉邵光辉夏威夷赵志峰
Owner NANJING FORESTRY UNIV
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