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Permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and preparation method thereof

A permeable reactive wall, polycyclic aromatic hydrocarbon technology, applied in water pollutants, polluted groundwater/leachate treatment, chemical instruments and methods, etc. No secondary pollution, vigorous survival and reproduction

Active Publication Date: 2017-10-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that organic pollutants such as polycyclic aromatic hydrocarbons are difficult to degrade under the condition of hypoxia in existing groundwater, the present invention provides a permeable reactive wall composite material and a preparation method thereof for the restoration of polycyclic aromatic hydrocarbon pollution in groundwater. Create a suitable environment for the growth and reproduction of microorganisms and provide sufficient carbon sources, and use the ferric ions (Fe[III]) produced by the chemical reaction of zero-valent iron in the composite materials as electron acceptors to promote the removal of polycyclic aromatic hydrocarbons in groundwater. Anaerobic degradation

Method used

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  • Permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and preparation method thereof
  • Permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and preparation method thereof
  • Permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and preparation method thereof

Examples

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Embodiment 1

[0049] A kind of permeable reactive wall composite material used for the restoration of groundwater polycyclic aromatic hydrocarbon pollution in this embodiment 1, including a slow-release filling layer and a shell, wherein the slow-release filling layer is composed of the following components in mass percentage: zero-valent iron 8.9% powder, which mainly provides electron acceptors for microbial anaerobic degradation of polycyclic aromatic hydrocarbons; 30.6% coconut shell biochar, which is a raw material for carbon release, is mainly a carbon source for ensuring the growth of microorganisms; 20.3% plastic bonding raw material attapulgite, which is mainly It is to bond all the raw materials together and maintain a certain hardness; the high-permeability raw material diatomite is 8.3%, which mainly ensures that the composite material contains natural porous channels, which can slowly release iron ions and carbon sources; water is 31.9%. The shell has the function of coating pro...

Embodiment 2

[0059] The permeable reactive wall composite material used for the restoration of groundwater PAH pollution in Example 2 is basically the same as in Example 1, except that the slow-release filling layer contains 10.6% of zero-valent iron powder and carbon-releasing raw materials. Coconut shell biochar is 28.6%, plastic bonding raw material attapulgite is 18.3%, high permeability raw material diatomite is 6.2%, and water is 36.3%. The high-permeability raw material diatomite of the shell is 10.8%, the plastic bonding raw material is 49.5% (ordinary Portland cement 19.5%, attapulgite 30%), and water is 39.7%; among them, coconut shell biochar is 70 mesh, zero price Iron powder, attapulgite and diatomite are 150 mesh, and cement is 90 mesh.

[0060] The preparation method of the permeable reactive wall composite material used for groundwater PAH pollution restoration is basically the same as in Example 1, except that the particle size of the slow-release filling layer in step (1)...

Embodiment 3

[0064] The permeable reactive wall composite material used for the restoration of groundwater PAH pollution in Example 3 is basically the same as that in Example 1, except that the slow-release filling layer is 12.8% of zero-valent iron powder, and the carbon-releasing raw material Coconut shell biochar 24.1%, plastic bonding raw material attapulgite 16.6%, high permeability raw material diatomite 5.5%, water 41%; shell includes high permeability raw material diatomite 11.6%, plastic bonding raw material 47.2% (Ordinary Portland cement 21.2%, attapulgite 26%), water is 41.2%. The coconut shell biochar in this example is 80 mesh, the zero-valent iron powder, attapulgite and diatomite are 200 mesh, and the cement is 100 mesh.

[0065] The preparation method of the permeable reactive wall composite material used for groundwater polycyclic aromatic hydrocarbon pollution restoration is basically the same as in Example 1, the difference is that the particle size of the slow-release ...

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Abstract

The invention discloses a permeable reactive barrier composite material for repairing underground water polycyclic aromatic hydrocarbon contamination and a preparation method thereof, and belongs to the technical field of underground water repairing. The composite material comprises a sustained-release filling layer and a shell, wherein the sustained-release filling layer is prepared from the following components: 8.9-12.8 percent of zero-valent iron powder, 24.1-30.6 percent of a carbon release raw material, 16.6-20.3 percent of a plastic adhesive raw material, 5.5-8.3 percent of a high-permeable raw material and the balance of water; and the shell is prepared from 9.7-11.6 percent of a high-permeable raw material, 47.2-52.3 percent of a plastic adhesive raw material and the balance of water. The permeable reactive barrier composite material is low in cost and simple and convenient to prepare, has an effect of sustainably releasing iron ions and carbon sources, can be used for decomposing polycyclic aromatic hydrocarbon organic contamination under the underground water anoxia condition, and has a wide application prospect in the field of underground water contamination repairing.

Description

technical field [0001] The invention belongs to the technical field of groundwater remediation, and more specifically relates to a permeable reactive wall composite material used for the remediation of groundwater polycyclic aromatic hydrocarbon pollution and a preparation method thereof. Background technique [0002] Polycyclic aromatic hydrocarbons refer to a class of condensed ring compounds in which two or more benzene rings are arranged in a linear, angular or clustered form, and are generally produced by incomplete combustion or pyrolysis of organic substances. Subsidence, rainfall, industrial discharges, and soil leachate enter groundwater, causing them to become major pollutants in groundwater. Many studies have shown that the concentration of PAH pollutants in groundwater is increasing, and because of their potential teratogenicity, carcinogenicity, genotoxicity, and bioaccumulation, low concentrations of PAHs can be safe for agricultural products pose a serious th...

Claims

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Application Information

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IPC IPC(8): C02F3/34C02F3/28C02F103/06C02F101/32
CPCC02F3/2806C02F3/34C02F2101/327C02F2103/06C02F2203/006C02F2305/06
Inventor 郭红岩刘翠翠尹颖杜文超王水曲常胜张满成丁亮
Owner NANJING UNIV
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