Chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil

A polychlorinated diphenyl ether and compound pollution technology, applied in the restoration of polluted soil, etc., can solve the problem of poor effect, difficult and efficient elution and removal of organic-inorganic pollutants, and less attention and research and development of contaminated soil remediation technology, etc. problems, achieve the effect of reducing interfacial tension and surface tension, promoting desorption migration ability, and improving elution removal rate

Active Publication Date: 2014-12-03
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the application numbers: CN201110278862 and CN201410071012 respectively provide a method for high-efficiency PBDE degradation bacteria and its application, and a method for remediating PBDE-contaminated soil granules and its application, but these two methods are mainly aimed at single PBDE The degradation of ether organic pollutants does not take into account the situation of compound polluted soil with polybrominated diphenyl ethers and heavy metals. At the same time, the bacterial strain provided in CN201110278862 is mainly aimed at degrading low-concentration polybrominated diphenyl ethers in soil, and the white-rot fungus hyphae fermentation provided in CN201410071012 The solution is mainly aimed at degrading low-concentration polybrominated diphenyl ethers in soil, but the effect is not good for the remediation of high-concentration polluted soil; application number: CN201310545065 provides a method for electrically remediating polybrominated diphenyl ether-contaminated soil, but this method requires Only when the soil pH value is adjusted to 3-4 can the efficient degradation of polybrominated diphenyl ethers be achieved, so the disturbance and damage to the ecological function of the restored soil are relatively large, and the restoration of the environmental ecological function of the restored soil is not taken into account; application number: CN201010220381 Provides a microbial fuel cell and its application method in the degradation of polybrominated diphenyl ethers, but this method is mainly aimed at the degradation of polybrominated diphenyl ethers in the water environment, and it is difficult to carry out remediation engineering operations on large-scale polybrominated diphenyl ether-contaminated soil areas; application No.: CN201310077333 and CN200510086490 respectively provide a method for in-situ remediation of PBDE-contaminated soil using nano-Ni/Fe bimetallic particle composite materials and a method for rapidly degrading PBDEs with nano-iron powder. Although these two methods can effectively degrade The parent compound of polybrominated diphenyl ether is removed, but the degradation products of polybrominated diphenyl ether still remain in the soil, and the physiological toxicity and environmental risk of its degradation secondary products or nano-remediation materials in the soil environment are not considered; application number: CN201310636248, provided A new type of soil purifying agent and its application method for the remediation of polybrominated diphenyl ether-contaminated soil is proposed. This method uses anionic surfactants and iron compounds to form metal complexes and add them to the soil to improve the bioavailability of polybrominated diphenyl ethers. Through the removal of soil filtrate, the removal of polybrominated diphenyl ethers is realized, but this method is only aimed at the removal of a single low-concentration polybrominated diphenyl ether, and has not considered the situation of heavy metal complex pollution at the same time; application number: CN200810239353,...

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  • Chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil
  • Chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil
  • Chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil

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Experimental program
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Effect test

Embodiment 1

[0043] For total PBDE concentrations greater than 100 mg kg -1 And less than 500 mg kg -1 , Pb concentration greater than 600 mg kg -1 And less than 1000 mg kg -1 , Cd concentration greater than 1 mg kg -1 and less than 10 mg kg -1 , Cu concentration greater than 1000 mg kg -1 And less than 2000 mg kg -1 , Ni concentration greater than 200 mg kg -1 And less than 500 mg kg -1 The composite polluted soil:

[0044]The test soil was collected from a polluted site of an electronic waste treatment plant in Jiangning District, Nanjing City, Jiangsu 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 pH 6.1, organic matter content 21.2 g kg -1 , total nitrogen 1.4 g kg -1 , available nitrogen 49.3 mg kg -1 , total phosphorus 0.5 g kg -1 , available phosphorus 56.2 mg kg -1 . The mechanical composition of the soil is 9....

Embodiment 2

[0048] For total PBDE concentrations greater than 500 mg kg -1 And less than 1000 mg kg -1 , Pb concentration greater than 1000 mg kg -1 And less than 5000 mg kg -1 , Cd concentration greater than 10 mg kg -1 and less than 50 mg kg -1 , Cu concentration greater than 2000 mg kg -1 And less than 5000 mg kg -1 , Ni concentration greater than 500 mg kg -1 And less than 1000 mg kg -1 The composite polluted soil:

[0049] The test soil was collected from the polluted soil of an electronic waste recycling plant in Longtang Town, Qingyuan City, Guangdong 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 pH 6.7, organic matter content 18.3 g kg -1 , total nitrogen 1.6 g kg -1 , available nitrogen 46.6 mg kg -1 , total phosphorus 0.3 g kg -1 , available phosphorus 47.8 mg kg -1 . The mechanical composition of the soil ...

Embodiment 3

[0053] For total PBDE concentrations greater than 1000 mg kg -1 , Pb concentration greater than 5000 mg kg -1 , Cd concentration greater than 50 mg kg -1 , Cu concentration greater than 5000 mg kg -1 , Ni concentration greater than 1000 mg kg -1 The composite polluted soil:

[0054] The test soil was collected from the polluted soil of an electronic waste treatment plant in Guiyu, Guangdong 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 pH 6.3, organic matter content 18.2 g kg -1 , total nitrogen 1.9 g kg -1 , available nitrogen 49.3 mg kg -1 , total phosphorus 0.45 g kg -1 , available phosphorus 66.5 mg kg -1 . The soil mechanical composition is 15.9 wt.% sand, 58.3 wt.% loam, and 25.8 wt.% clay. The background pollution concentrations of total PBDEs and Pb, Cd, Cu, Ni in soil were 2342.5 ± 127.3 mg kg -1 , ...

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Abstract

The invention discloses a chemical elution-plant combined remediation method of polybrominated diphenyl ether and heavy metal compound contaminated soil. Firstly, contaminated soil particles are crushed and screened; then, the soil particles are put in soil multiple ectopic remediation equipment, mixed eluant is added, and a ultrasonic reinforcement and heating treatment mode is adopted to perform the continuous ectopic synergy elution; glyptostrobus pensilis is inoculated in the eluted soil, nutrient source buffer solution being 15-30 mass% of the soil is applied; and the remediation is finished through manual cultivation growth. The method can synchronously and efficiently elute polybrominated diphenyl ether and multiple heavy metals in the soil; and the inoculation of the glyptostrobus pensilis and the addition of external source nutrient substances facilitate deep degradation of the residual polybrominated diphenyl ether after the elution of the soil, and facilitate the recovery of ecological function diversity and stability of polluted soil environmental microorganisms.

Description

[0001] technical field [0002] The invention belongs to the technical field of remediation of organic-inorganic composite polluted soil, and in particular relates to a rapid chemical elution-plant combined restoration method of polychlorinated diphenyl ether and multiple heavy metal composite polluted soil. [0003] Background technique [0004] In recent years, with the rapid development of my country's economy and the continuous improvement of people's living standards, a large number of new electronic products (such as: computers, mobile phones, printers, scanners, navigators and satellite TVs, etc.) have gradually been widely used by people. The replacement and upgrading cycle of electronic science and technology has become shorter, and a large number of waste electronic waste products have been quickly eliminated and discarded, resulting in the emergence of a large number of polluted areas around cities and towns in my country where electronic waste accumulates. In suc...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 叶茂孙明明程吟文张厦蒋新宋洋王芳卞永荣谷成刚杨兴伦
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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