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Method for repairing heavy metal and polycyclic aromatic hydrocarbon composite polluted soil

A polycyclic aromatic hydrocarbon and compound pollution technology, which is applied in the restoration of polluted soil and other directions, can solve the problem of difficulty in remediation of heavy metal and polycyclic aromatic hydrocarbon compound polluted soil, and achieves the effects of simple operation, good effect and high remediation efficiency.

Active Publication Date: 2019-08-02
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As arsenic often exists in heavy metal and polycyclic aromatic hydrocarbon compound polluted soil, arsenic is a variable-valence metal element, so it brings difficulties to the remediation of heavy metal and polycyclic aromatic hydrocarbon compound polluted soil

Method used

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  • Method for repairing heavy metal and polycyclic aromatic hydrocarbon composite polluted soil
  • Method for repairing heavy metal and polycyclic aromatic hydrocarbon composite polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for repairing heavy metal and polycyclic aromatic hydrocarbon compound polluted soil, comprising the following steps:

[0037] (1) Soil pre-treatment: Remove branches, leaves, stones and other foreign matter from the heavy metal and polycyclic aromatic hydrocarbon compound-contaminated soil, mix it evenly, crush it, and pass it through a 20-mesh nylon sieve to complete the soil pre-treatment.

[0038] (2) Determination of physical and chemical properties and pollutant content: According to the standard method, the physical and chemical properties and pollutant content of the pre-treated soil were measured. The pH of the heavy metal and polycyclic aromatic hydrocarbon compound polluted soil was 8.8, and the organic matter was 23.0g / kg. , the water content is 15.5%; the content of arsenic is 39.2mg / kg, the content of lead is 127mg / kg, the content of zinc is 3690mg / kg, the content of nickel is 1329mg / kg, the content of benzo[a]pyrene in polycyclic aromatic hydrocar...

Embodiment 2

[0050] Concrete method is identical with embodiment 1, and the batch of processing soil is identical with embodiment 1; Difference is to adopt the modified bentonite; Modified bentonite is prepared according to the following process:

[0051] Put the bentonite at a temperature of 450°C for calcination, the calcination time is 2h, take it out, cool to room temperature, and then add 2mol / L hydrochloric acid solution, whichever is not over, stir at 200rpm for 3min, then let it stand for 60min, 80-90 Dry at ℃, and finally grind into a powder with a particle size greater than 100 mesh. The index parameters of each pollutant in the treated soil are shown in Table 3:

[0052] Table 3 Contents of heavy metals and leaching toxicity in soil before and after stabilization

[0053]

[0054] Conclusion: It can be seen from Table 3 that on the basis of Example 1, the concentration of heavy metals in the leachate after the addition of the modified bentonite has reached the groundwater Cl...

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Abstract

The invention belongs to the field of heavy metal and polycyclic aromatic hydrocarbon composite pollution repairing in polluted environments, and discloses a method for repairing heavy metal and polycyclic aromatic hydrocarbon composite polluted soil. The method comprises the following steps: (1) performing pretreatment on the soil; (2) performing high-temperature thermal desorption; (3) performing stabilizing treatment; and (4) performing stabilizing maintenance. Polycyclic aromatic hydrocarbon organic pollutants are removed from the heavy metal and polycyclic aromatic hydrocarbon composite polluted soil through high-temperature thermal desorption, and the heavy metal is subjected to stabilizing treatment through a stabilizing agent, so that the method is simple to operate, high in repairing efficiency, large in treatment quantity and environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal and polycyclic aromatic hydrocarbon compound pollution in polluted environments, and relates to a method for remediating heavy metal and polycyclic aromatic hydrocarbon compound polluted soil, in particular to a method for utilizing thermal desorption and stabilization of heavy metal and polycyclic aromatic hydrocarbon compound polluted soil. Background technique [0002] Human activities such as mining, metal smelting, farmland sewage irrigation, agricultural use of sludge, and application of fertilizers and pesticides have caused a large amount of soil pollution, seriously threatening ecological balance, food safety, and human health. Among them, cadmium (Cd), mercury (Hg), arsenic (As), chromium (Cr) and lead (Pb) are considered to be the "five poisons" among the main heavy metal pollutants. The "National Soil Pollution Survey Bulletin" shows that among the 775 soil points in the 81 in...

Claims

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Application Information

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IPC IPC(8): B09C1/06B09C1/08B09C1/00
CPCB09C1/00B09C1/06B09C1/08
Inventor 应蓉蓉石佳奇夏冰邓绍坡张斌孔令雅张晓雨芦园园尹爱经冯艳红单艳红
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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