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Filling medium of biological permeable reactive barrier for in-situ remediation of underground water and preparation method

A osmotic reaction wall and in-situ repair technology, which is applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of bacteria loss, poor impact resistance, and unfavorable long-term repair And other issues

Inactive Publication Date: 2012-10-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural materials such as plant debris, quartz sand, peat soil, activated carbon, and soil are often used as filling media in bio-permeable reaction walls. Bacteria are easy to lose and have poor impact resistance, which is not conducive to long-term repair

Method used

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  • Filling medium of biological permeable reactive barrier for in-situ remediation of underground water and preparation method
  • Filling medium of biological permeable reactive barrier for in-situ remediation of underground water and preparation method
  • Filling medium of biological permeable reactive barrier for in-situ remediation of underground water and preparation method

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preparation example Construction

[0029] The preparation method of the biopermeable reaction wall filling medium for in-situ restoration of groundwater comprises the following sequence and steps:

[0030] A, make mixture by volume ratio peat soil: PVA=40: 60 (v / v);

[0031] b. Add 1 g of the dominant degrading bacteria of the target pollutant collected by centrifugation into 1 L of the mixture, mix well and pour into a large container so that its thickness is 5 mm;

[0032] c. Then cover it with a layer of 5mm thick phosphate solution containing 1.25mol / L NaH 2 PO 4 and 1.25mol / L Na 2 HPO 4 ;

[0033] d. React at 30°C for 24 hours to make filling medium;

[0034] e. Cut the prepared filling medium into small pieces of 5mm×5mm to obtain the finished filling medium.

[0035] The particle size of the peat soil is 0.18-0.83 mm, and the concentration of the PVA solution is 10% m / v.

[0036] According to the permeability coefficient requirements of the permeable reaction wall, the finished filling medium is m...

Embodiment 1

[0038] Using the groundwater polluted by the herbicide atrazine as the in-situ restoration object of the biopermeable reactive wall filling medium,

[0039] A, make mixture by volume ratio peat soil: PVA=40: 60 (v / v);

[0040] b. Add 1 g of atrazine-degrading bacteria-Pseudomonas W4 collected by centrifugation to 1 L of the mixture, mix well and pour into a large container to make the thickness 5mm;

[0041] c. Then cover it with a layer of 5mm thick phosphate solution containing 1.25mol / L NaH 2 PO 4 and 1.25mol / L Na 2 HPO 4 ;

[0042] d. React at 30°C for 24 hours to make filling medium;

[0043] e. Cut the prepared filling medium into small pieces of 5mm×5mm to obtain the finished filling medium.

[0044] According to the permeability coefficient of the permeable reaction wall is 101.88m / d, the permeable reaction wall is filled with the finished filling medium as the medium, and the atrazine-contaminated groundwater is restored.

[0045] From image 3 It can be seen ...

Embodiment 2

[0050] Using the groundwater polluted by the herbicide atrazine as the in-situ restoration object of the biopermeable reactive wall filling medium,

[0051] A, make mixture by volume ratio peat soil: PVA=40: 60 (v / v);

[0052] b. Add 1 g of atrazine-degrading bacteria-Pseudomonas W4 collected by centrifugation to 1 L of the mixture, mix well and pour into a large container to make the thickness 5mm;

[0053] c. Then cover it with a layer of 5mm thick phosphate solution containing 1.25mol / L NaH 2 PO 4 and 1.25mol / L Na 2 HPO 4 ;

[0054] d. React at 30°C for 24 hours to make filling medium;

[0055] e. Cut the prepared filling medium into small pieces of 5mm×5mm to obtain the finished filling medium.

[0056] According to the permeability coefficient of the permeable reaction wall is 89.92m / d, the finished filling medium is mixed with the sand with a particle size of 0.4-2mm in a volume ratio of 1:1, and filled into the permeable reaction wall to repair the atrazine-contamin...

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Abstract

The invention relates to a filling medium of a biological permeable reactive barrier for in-situ remediation of underground water and a preparation method. According to the preparation method, polyvinyl alcohol serves as a carrier for embedding immobilized dominant degradation bacteria, phosphate serves as cross-linking agents for gelatinization of the polyvinyl alcohol, and turfy soil serves as additives for phosphorylated polyvinyl alcohol. According to permeability coefficient requirement of the permeable reactive barrier, filling medium products and sand with different grain sizes are mixed and filled in the reactive barrier. The dominant degradation bacteria of target pollutants are embedded and immobilized inside the biological permeable reactive barrier filling medium, so that loss of the dominant degradation bacteria is avoided, and impact resistance of the dominant degradation bacteria is improved. Besides, the filling medium provides nutrient substance for metabolic breeding of the dominant degradation bacteria, and accordingly additional arrangement of a nutrient substance supply system is not needed when the biological permeable reactive barrier is built.

Description

technical field [0001] The invention relates to a biopermeable reaction wall filling medium for repairing polluted groundwater, in particular to in-situ repairing of polluted groundwater pollution and a preparation method thereof. Background technique [0002] Permeable reactive wall technology is a new groundwater pollution control technology developed in the 1990s. It has the advantages of less investment, less disturbance, and long-term treatment of pollutants. It has developed rapidly in recent years. The bio-permeable reaction wall refers to the construction of a permeable reaction wall downstream of the pollution source, and the establishment of an electron acceptor and nutrient supply system to activate indigenous microorganisms or inoculate the dominant degrading bacteria of the target pollutant in the reaction area, forming a biologically active reaction wall. When the polluted groundwater flows through the reaction wall, the pollutants in the groundwater will be d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/04C02F3/00
Inventor 刘娜毕海涛张兰英朱博麟
Owner JILIN UNIV