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Method of using industrial iron powder to restore halogenated hydrocarbon polluted soil

A technology of polluted soil and halogenated hydrocarbons, applied in the restoration of polluted soil, etc., can solve the problem of difficult to effectively remove the passivation layer of zero-valent iron, difficult to effectively release highly active zero-valent iron, and limit the removal effect of halogenated hydrocarbon pollutants and other problems, to achieve the effect of reducing repair costs, fast response and high efficiency

Active Publication Date: 2020-03-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when exogenous iron-reducing bacteria are directly added to the soil, it is difficult to survive and play a reducing role. This is because the soil environment is complex, and endogenous microorganisms in the soil often inhibit the growth of exogenous iron-reducing bacteria through nutrient competition. It makes it difficult for exogenous iron-reducing bacteria to effectively remove the passivation layer of zero-valent iron, which makes it difficult to effectively release highly active zero-valent iron, thereby limiting the removal effect of halogenated hydrocarbon pollutants in soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Collect carbon tetrachloride (80mg / kg) contaminated soil from a pesticide factory in Tianjin. Heat the contaminated soil to 60°C to inhibit the activity of endogenous microorganisms in the soil. Add thermophilic reducing bacteria, biochar-iron powder composite material, and tap water to the polluted soil, the amount of biochar-iron powder composite material added is 0.5% of the soil mass, and the stirrer stirs to make the biochar-iron powder composite material, The thermophilic reducing bacteria are thoroughly mixed with the soil particles. Nutrients (that is, medium) are then injected to make the thermophilic reducing bacteria fully active, and the biochar-iron powder composite fully reacts with carbon tetrachloride in the soil for 3 days, thereby reducing carbon tetrachloride. After the implementation of this embodiment, the carbon tetrachloride content in the soil dropped to 0.5mg / kg. After the repair is completed, the soil temperature is restored, the growth of ex...

Embodiment 2

[0025] Collect carbon tetrachloride (80mg / kg) contaminated soil from a pesticide factory in Tianjin. Heat the contaminated soil to 60°C to inhibit the activity of endogenous microorganisms. Add thermophilic reducing bacteria, biochar-iron powder composite material, and tap water into the polluted soil, the amount of biochar-iron powder composite material added is 0.3% of the soil mass, and the stirrer stirs to make the biochar-iron powder composite material, Thermophilic reducing bacteria are thoroughly mixed with soil particles. Nutrients are injected and the stirrer stirs to make the thermophilic reducing bacteria fully active. The biochar-iron powder composite fully reacted with carbon tetrachloride in the soil for 5 days, thereby reducing carbon tetrachloride. After the present embodiment was implemented, the carbon tetrachloride content in the soil dropped to 7mg / kg. After the repair is completed, the soil temperature is restored, the growth of exogenous microorganisms...

Embodiment 3

[0029] Collect a certain trichlorethylene (94mg / kg) polluted soil. Heat the contaminated soil to 55°C to inhibit the growth of endogenous microorganisms. Add thermophilic reducing bacteria, biochar-iron powder composite material, and tap water to the polluted soil, the amount of biochar-iron powder composite material added is 0.5% of the soil mass, and the stirrer stirs to make the biochar-iron powder composite material, Thermophilic reducing bacteria are thoroughly mixed with soil particles. Nutrients are injected and stirred by a stirrer to fully activate the thermophilic reducing bacteria, and the biochar-iron powder composite material fully reacts with trichlorethylene in the soil for 4 days, thereby reducing trichlorethylene. After the implementation of this example, the content of trichlorethylene in the soil was reduced to 9 mg / kg. After the repair is completed, the soil temperature is restored, the growth of exogenous microorganisms is inhibited, and the original eco...

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Abstract

The invention relates to a method of using industrial iron powder to restore halogenated hydrocarbon polluted soil. The passivation layer on the surface of industrial iron powder can protect high activity zero valent iron; through heating, the activity of indigenous microorganisms in soil is inhibited; passivated zero valent iron and exogenous thermophilic iron-reducing bacteria are injected intosoil to be restored; by adjusting the activity of the thermophilic iron-reducing bacteria, the zero valent iron passivation layer can be removed in a controllable mode, high activity zero valent ironis exposed, and controllable reduction of halogenated hydrocarbon in soil is realized.

Description

technical field [0001] The invention relates to a method for repairing halogenated hydrocarbon polluted soil by using industrial iron powder. Background technique [0002] Halogenated hydrocarbons have "three causes" effects, and their control and restoration in soil have attracted much attention. Chemical reduction is a common remediation technology for halocarbon-contaminated soil. Zero-valent iron is a widely used reducing agent due to its strong reactivity and environmental protection. However, zero-valent iron still faces some problems during its use. Zero-valent iron is unstable in the air and is easily oxidized to form a passivation layer, which hinders the electron transfer between zero-valent iron and halogenated hydrocarbons and affects the reduction performance. The reduction and passivation of zero-valent iron can be strengthened by iron-reducing bacteria, and the degradation efficiency of chlorinated hydrocarbons can be improved. However, when exogenous iron-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10
CPCB09C1/10
Inventor 马小东王菲
Owner HEBEI UNIV OF TECH
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