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Repairing system for double-layer permeable reaction wall, preparation method and application

A technology of permeable reaction wall and reaction wall, which is applied in the production of the above-mentioned double-layer permeable reaction wall system, and in the field of double-layer permeable reaction wall system, can solve the problems of strengthening microorganism loss, difficult to inject microorganisms, and high price, and achieve reduction Effect of flocculent precipitation, increasing concentration and avoiding clogging

Active Publication Date: 2012-07-18
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Biological stimulation and activation is to inject organic carbon and other nutrients into the groundwater system to stimulate the vitality of indigenous microorganisms. The limitation of this technology is that there are very few microorganisms in the aquifer that degrade nitrobenzene pollutants, and the activation accumulation is very slow. The process takes a long time to repair;
[0009] Bioaugmentation is the introduction of off-site degradable microorganisms, which are cultivated, trained and loaded in the laboratory and then injected into the groundwater system.
At the same time, due to the flow of groundwater and the weak affinity between the bacteria and the aquifer medium, the loss of enhanced microorganisms is serious, thereby reducing the effect of bioremediation and increasing the cost of remediation

Method used

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  • Repairing system for double-layer permeable reaction wall, preparation method and application
  • Repairing system for double-layer permeable reaction wall, preparation method and application

Examples

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Embodiment 1

[0046] In a groundwater nitrobenzene-contaminated site, according to the implementation steps of the present invention, the installation of the double permeable reaction wall is completed through the investigation of the scope and degree of groundwater pollution and the simulation prediction results. The thicknesses of the two reaction walls (that is, the thickness L of the reduction reaction wall and the thickness L′ of the oxidation reaction wall) are calculated according to the formula L=(1~2.5)t*k, which are 0.5m and 0.6m respectively. The reduction reaction wall is filled with a mixture of acidic modified zeolite and zero-valent iron powder, and the mass ratio of the modified zeolite to the zero-valent iron powder is 1:0.5-0.9; the oxidation reaction wall is filled with active oxidant: stable curing adhesive: Zeolite: water is mixed according to 1: 1.5: 0.5: 1 to prepare slow-release oxidation particles with an average particle diameter of 4 mm. Multiple monitoring wells ...

Embodiment 2

[0048] In a groundwater 2,4-dinitrotoluene polluted site, the installation of the double permeable reaction wall is completed according to the implementation steps in this method through the investigation of the scope and degree of groundwater pollution on site and the simulation prediction results. The thicknesses of the two reaction walls, namely the activation-reduction permeable reaction wall and the slow-release oxidation permeable reaction wall, are calculated according to the formula L=(1-2.5)t*k, which are 0.4m and 0.5m respectively. The reduction reaction wall is filled with a mixture of acidic modified zeolite and zero-valent iron powder, and the oxidation reaction wall is filled with a particle size prepared by mixing active oxidant: stable curing binder: zeolite: water at a ratio of 1:1.6:0.5:1.1 4mm slow-release oxidation particles. Multiple monitoring wells are arranged in the site, and samples are taken regularly to detect the concentration of pollutants in grou...

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Abstract

The invention relates to a repairing system for a double-layer permeable reaction wall. The repairing system is composed of a reduction reaction wall and an oxidizing reaction wall, wherein the reduction reaction wall is located at the upstream of water flow; the oxidizing reaction wall is located at the downstream of the water flow; the reduction reaction wall and the oxidizing reaction wall both have frame box structures; netted articles are arranged on two front sides of the frame box vertical to the flowing direction of underground water and two lateral sides parallel to the flowing direction of underground water; modified zeolite and zero-valent iron powder are filled in the netted articles of the frame box of the reduction reaction wall and are filled to be at the altitude higher than the water line of the underground water; and active oxidants, stable curing adhesives, and slow-release grains formed by mixing zeolite with water are filled in the netted articles of the frame boxof the oxidizing reaction wall and are filled to be at the altitude higher than the water line of the underground water. The repairing system for the double-layer permeable reaction wall provided by the invention has the integrated functions of activating reduction and autocatalyzed oxidation, and is used for realizing the high-efficient removal of nitrobenzene pollutants in the underground water.

Description

technical field [0001] The invention belongs to the field of prevention and control of groundwater environmental pollution, and in particular relates to a double-layer permeable reaction wall system for repairing groundwater polluted by nitrobenzene compounds. [0002] The present invention also relates to a method for making the above-mentioned double-layer permeable reactive wall system. [0003] The invention also relates to the application of the above-mentioned double-layer permeable reaction wall system in the restoration of groundwater polluted by nitrobenzene compounds. Background technique [0004] As a type of organic pollution in groundwater, nitrobenzene compounds are mainly derived from industrial production processes such as explosives, dyes, pesticides, medicine and organic synthesis, including nitrobenzene, nitrochlorobenzene, nitrotoluene, and nitrophenol Wait. The groundwater pollution caused by it has become a hot issue in the field of environmental poll...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/38
CPCC04B2111/00284C04B2111/00775C04B2111/00017C04B28/04C04B2111/00793C04B14/047C04B14/06C04B22/068C04B22/142
Inventor 席北斗姜永海张进保安达李鸣晓白顺果
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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