Soil chlorinated hydrocarbon remediation method based on modified zero-valent iron

A restoration method and technology of zero-valent iron, applied in the field of soil restoration, can solve problems such as low restoration efficiency and poor contact, and achieve the effects of reducing the cost of chemicals, reducing consumption, and mild reaction conditions

Inactive Publication Date: 2019-05-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the deficiencies in the prior art, the present invention proposes a soil chlorinated hydrocarbon remediation method based on modified zero-valent iron. Effective desorption and release, thereby overcoming the problems of poor contact between traditional reducing agents and soil chlorinated hydrocarbons and low remediation efficiency

Method used

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  • Soil chlorinated hydrocarbon remediation method based on modified zero-valent iron
  • Soil chlorinated hydrocarbon remediation method based on modified zero-valent iron
  • Soil chlorinated hydrocarbon remediation method based on modified zero-valent iron

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Embodiment 1

[0047] The soil chlorinated hydrocarbon remediation method based on modified zero-valent iron of the present embodiment comprises the following steps:

[0048] (1) Mill commercially available activated carbon fibers (particle size: 50 μm) and commercially available reduced zero-valent iron powder (particle size: 100 μm) in a high-energy ball mill (rotating speed: 5000 r / min, ball milling time: 5 h) to obtain activated carbon fibers Modified zero-valent iron, wherein the particle size of the activated carbon fiber modified zero-valent iron is 10 μm, and the content of the activated carbon fiber in the activated carbon fiber-modified zero-valent iron is 2wt%;

[0049] (2) 5g / kg activated carbon fiber modified zero-valent iron is added to the contaminated site soil mixed with a certain actual trichlorethylene (the concentration of trichlorethylene is about 95.8mg / kg) and then put into the box reactor, Then start the reaction after adding distilled water according to the mass rati...

Embodiment 2

[0051] The soil chlorinated hydrocarbon remediation method based on modified zero-valent iron of the present embodiment comprises the following steps:

[0052] (1) Mill commercially available activated carbon fibers (particle size: 50 μm) and commercially available reduced zero-valent iron powder (particle size: 100 μm) in a high-energy ball mill (rotating speed: 5000 r / min, ball milling time: 5 h) to obtain activated carbon fibers Modified zero-valent iron, wherein the particle size of the activated carbon fiber modified zero-valent iron is 10 μm, and the content of the activated carbon fiber in the activated carbon fiber-modified zero-valent iron is 5wt%;

[0053] (2) 5g / kg activated carbon fiber modified zero-valent iron is added to the contaminated site soil mixed with a certain actual trichlorethylene (the concentration of trichlorethylene is about 95.8mg / kg) and then put into the box reactor, Then start the reaction after adding distilled water according to the mass rati...

Embodiment 3

[0055] The soil chlorinated hydrocarbon remediation method based on modified zero-valent iron of the present embodiment comprises the following steps:

[0056] (1) Mill commercially available activated carbon fibers (particle size: 50 μm) and commercially available reduced zero-valent iron powder (particle size: 100 μm) in a high-energy ball mill (rotating speed: 5000 r / min, ball milling time: 5 h) to obtain activated carbon fibers Modified zero-valent iron, wherein the particle size of the activated carbon fiber modified zero-valent iron is 10 μm, and the content of the activated carbon fiber in the activated carbon fiber-modified zero-valent iron is 5wt%;

[0057] (2) 10g / kg activated carbon fiber modified zero-valent iron is added to the contaminated site soil mixed with a certain actual trichlorethylene (the concentration of trichlorethylene is about 95.8mg / kg) and then put into the box reactor, Then start the reaction after adding distilled water according to the mass rat...

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Abstract

The invention provides a soil chlorinated hydrocarbon remediation method based on modified zero-valent iron, comprising mixing activated carbon fibers and zero-valent iron, performing ball milling toobtain activated carbon fiber-modified zero-valent iron, adding the activated carbon fiber-modified zero-valent iron into chlorinated hydrocarbons contaminated soil, and allowing to react. Compared with existing mediation processes with zero-valent iron, the soil chlorinated hydrocarbon remediation method based on modified zero-valent iron has the advantages that the addition of active carbon fibers brings no reduction in the reaction activity of zero-valent iron to reduce trichloroethylene and other chlorinated hydrocarbons; natural hydrophobicity and good adsorption of the active carbon fibers enables the zero-valent iron to evidently increase the release rate of chlorinated hydrocarbons from soil, so that the problem is solved that hysteretic separation of chlorinated hydrocarbons causeproneness to remediation rebound; in addition, the activated carbon fiber-modified zero-valent iron helps greatly increase the selectivity of zero-valent iron on target contaminates to be removed, namely under equal conditions, upon the removal of equal chlorinated hydrocarbons, the consumption of the zero-valent iron is evidently reduced, and therefore, chemicals cost can be reduced and the quantity of zero-valent iron waste is reduced correspondingly.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and specifically relates to a soil chlorinated hydrocarbon remediation method based on modified zero-valent iron, and more specifically relates to a soil chlorinated hydrocarbon chemistry based on active carbon fiber modified zero-valent iron solubilization and efficiency enhancement. Revert the repair method. Background technique [0002] With the acceleration of my country's industrialization process, the problem of soil chlorinated organic pollution is becoming more and more serious, and most of these substances have strong carcinogenic, teratogenic and mutagenic properties, so the control and restoration of soil chlorinated hydrocarbon pollution has aroused widespread concern focus on. Chlorinated hydrocarbons are mostly non-aqueous liquids, which are denser than water, less water-soluble, more biologically toxic, and more electronegative, so they are difficult to degrade by biologic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 孙远奎关小红
Owner TONGJI UNIV
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