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Chemistry-microorganism combination restoration method of polycyclic aromatic hydrocarbons and heavy metal composite contaminated site soil

A technology of polycyclic aromatic hydrocarbons and complex pollution, applied in the field of soil remediation of contaminated sites, can solve the problems of lack of leaching technology, large environmental interference factors, long operation cycle, etc., and achieve the effect of high broad-spectrum, easy promotion, and simple operation

Inactive Publication Date: 2013-02-27
INST OF SOIL SCI CHINESE ACAD OF SCI
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Problems solved by technology

But these methods are mainly aimed at the low polycyclic aromatic hydrocarbon polluted farmland soil of pollution concentration, and for the site soil of high pollution concentration, then effect is poor; The actual operation cycle of this type of method is longer, and the environmental interference factors received are relatively large, which is not conducive to the rapid restoration effect; application number: 200710010441.X provides a heavy metal contaminated soil washing device and method, but this method is only for Remediation of polluted soil, but for the complex polluted soil that organic pollutants and heavy metals exist at the same time, the effect is poor; the prior art closest to the present invention is surfactant elution technology
Application number: 201010558286.7 provides a method for leaching and remediating organic-inorganic composite polluted soil. This method mainly uses sodium lauryl sulfate and diethylamine disuccinic acid to leaching the polluted soil, but the method is aimed at organic pollutants Mainly chlorobenzene and trichlorethylene organic pollutants. The heavy metals targeted are mainly copper and chromium-contaminated soils. There is a lack of effectiveness verification for polycyclic aromatic hydrocarbons and multiple types of heavy metal-contaminated soils, and the chemical eluents used Potential risk for restoration of environmental ecological functions of polluted soil
[0006] The main disadvantages of the existing technology are the lack of leaching technology for organic-inorganic composite polluted soil at the same time, fewer types of organic-inorganic pollutants, poor environmental friendliness of the selected chemical leaching agent, and poor leaching removal effect. Incomplete waiting, so the application prospect of the existing technology market is not clear
[0007] The main reasons for the defects are: In recent years, there have been a large number of organic-inorganic compound polluted sites caused by the closure and relocation of coking plants, steel plants, and power plants. There is relatively little research and development; the existing remediation technologies are mainly aimed at farmland soils with relatively low pollution concentrations, but the remediation effect is obviously not good for site soils with high pollution concentrations; existing remediation technologies have various ecological functions for the remediation soil environment microorganism Less consideration for sexual recovery

Method used

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  • Chemistry-microorganism combination restoration method of polycyclic aromatic hydrocarbons and heavy metal composite contaminated site soil
  • Chemistry-microorganism combination restoration method of polycyclic aromatic hydrocarbons and heavy metal composite contaminated site soil
  • Chemistry-microorganism combination restoration method of polycyclic aromatic hydrocarbons and heavy metal composite contaminated site soil

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Experimental program
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Embodiment 1

[0024] The test soil was collected from the polluted site of a closed coking plant in the suburbs of Beijing. The soil samples were air-dried, the impurities were sorted out, and the soil samples were passed through a 10-mesh sieve for later use. The basic physical and chemical properties of the soil are pH 6.2, organic matter content 22.0 g / kg, total nitrogen 1.2 g / kg, available nitrogen 63.3 mg kg -1 , total phosphorus 0.43 g kg -1 , available phosphorus 78.7 mg kg -1 . The soil mechanical composition is 9.8% sand, 53.5% loam and 36.9% clay. The total polycyclic aromatic hydrocarbon content in the soil was 135.23 ± 7.74mg / kg. The contents of Cd, Ni, Zn, Cr and Pb are 11.74 ± 0.79, 135.23 ± 8.72, 236.03 ± 13.77, 310.32 ± 13.43 and 236.03 ± 9.84mg kg, respectively -1 . Before elution, air-dry the polluted soil and sieve it to remove unbreakable substances such as large-sized stones and plant roots in the soil, then pour the soil particles with a particle size of less tha...

Embodiment 2

[0028] The test soil was collected from a PAHs-contaminated site of a coking plant in a typical suburban area of ​​Wuhu City, Anhui Province. The soil samples were air-dried, the impurities were sorted out, and the soil samples were passed through a 10-mesh sieve for later use. The basic physical and chemical properties of the soil are as follows: pH6.5, sand 8.7%, 59.2% silt, 32.1% clay, organic matter 18.0 g / kg, total nitrogen 1.5 g kg -1 , available nitrogen 57.6 mg kg -1 , total phosphorus 0.37 g kg -1 , available phosphorus 62.1 mg kg -1 . The total PAH content in the soil was 337.34±9.54 mg / kg. The soil is mainly polluted by three heavy metal elements: Cd, Zn, and Pb, the contents of which are 5.43 ± 0.29 mg / kg, 423.12 ± 3.43 mg / kg and 654.25 ± 41.36mg kg respectively -1 . Before elution, air-dry the polluted soil and sieve it to remove unbreakable substances such as large-sized stones and plant roots in the soil, then pour the soil particles with a particle size o...

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Abstract

Disclosed is a chemistry-microorganism combination restoration method of polycyclic aromatic hydrocarbons and heavy metal composite contaminated site soil. The method comprises steps of (1), preparing soil particles and air drying and grinding contaminated site soil; (2), setting a restoration system, adding methyl beta cyclodextrin leacheate to a blender; (3), adjusting the reaction temperature to be 50+ / -2 DEG C; (4), adjusting an ultrasonic emission device to 35kHz for ultrasound of 30 minutes; (5) conducting continuous leaching, and repeating the continuous leaching for 3 times; and (6) conducting depth restoration of degrading bacteria, and inoculating polycyclic aromatic hydrocarbons degrading bacteria to soil which is subjected to continuous leaching restoration, adjusting the N / P to be 10:1 and conducting degradation for 90-140 days continuously. By the aid of the method, the restoration of the polycyclic aromatic hydrocarbons and heavy metal contaminated site soil generated by enterprises such as transferred coking plants, steel mills and power plants has wide application prospects.

Description

[0001] technical field [0002] The invention belongs to the technical field of soil remediation of polluted sites, and in particular relates to a rapid chemical-microbial remediation method for compound polluted soil of polycyclic aromatic hydrocarbons and various heavy metals. [0003] Background technique [0004] In recent years, with the acceleration of my country's urbanization process and industrial transfer, as well as the implementation of national policies such as "retreating from two to three" and "retreating from cities and entering parks", a large number of enterprises such as coking plants, steel plants and power plants have closed down. Site soil polluted by polycyclic aromatic hydrocarbons and heavy metals caused by relocation. At present, most of these sites are facing the conversion and secondary development of land use functions, such as: commercial land, residential buildings, etc. Potentially high-risk contaminated soil in these sites will become a "che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/08
Inventor 骆永明孙明明滕应刘五星李振高
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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