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Permeable reactive barrier and method for repairing polluted underground water by using permeable reactive barrier

A osmotic reaction wall and reaction technology, which is applied in the treatment of contaminated groundwater/leachate, restoration of contaminated soil, water pollutants, etc., can solve the problems of further improvement of the repair effect and limited performance of organic chemical catalytic degradation, etc. Achieve good adsorption and chemical catalytic oxidation degradation performance, improve catalytic oxidation effect, good effect

Pending Publication Date: 2022-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The permeable reactive walls and their repair materials and repair methods disclosed in the above prior art are either only used to adsorb specific pollutants, or only used to improve biodegradation performance, and the chemical catalytic degradation performance of organic matter is limited, resulting in further improvement of the repair effect

Method used

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  • Permeable reactive barrier and method for repairing polluted underground water by using permeable reactive barrier

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preparation example Construction

[0032] In the present invention, the method for preparing a catalytic oxidation composite carrier with a three-dimensional pore structure includes the following steps: (1) roasting the inorganic oxide composite soil at 600-1000°C; (2) beating the chopped fiber strands , to obtain a slurry after treatment; (3) Mix the inorganic oxide composite soil after the roasting treatment in step (1), the slurry obtained in step (2) and activated carbon evenly, and add bonding components and water to it and further undergo Forming and solidification treatment; (4) Feed the material obtained in step (3) into a sodium hydroxide solution for treatment. After the treatment is completed, solid-liquid separation is carried out, and the separated solid particles are dried and roasted to obtain a composite carrier.

[0033] In the preparation method of the above-mentioned composite carrier with a three-dimensional pore structure, the inorganic oxide composite soil described in step (1) is powdery p...

Embodiment 1

[0045] A certain polluted groundwater is repaired by the PRB provided by the present invention, and the PRB wall is laid out in the vertical direction of water flow, and a 20cm thick slow oxygen release layer is first laid at the bottom, and then a 20cm thick catalytic oxidation layer is laid in alternately. , until the height of the permeable reactive wall reaches 50 cm above the top of the saturated aquifer.

[0046] CaO in slow oxygen releasing layer 2 The mass ratio of powder, attapulgite powder and coarse sand is 2:2:1, and it is used as the filling material for the slow oxygen release layer after mixing.

[0047] The preparation method of the catalytic oxidation composite carrier is as follows: After mixing the activated carbon and the inorganic oxide composite soil treated at 800°C evenly, adding the alkali-soluble polyester cellulose fiber chopped shred slurry with a mass content of 20% and mixing evenly, and then adding a mass content of 25% % sodium silicate binder ...

Embodiment 2

[0052] A certain polluted groundwater is repaired by the PRB provided by the present invention. The PRB wall is laid out in the vertical direction of water flow, and a 15cm-thick slow oxygen-releasing layer is first laid on the bottom, and then a 25cm-thick catalytic oxidation layer is laid alternately. , until the height of the permeable reactive wall reaches 50 cm above the top of the saturated aquifer.

[0053] CaO in slow oxygen releasing layer 2 The mass ratio of powder, attapulgite powder and coarse sand is 2:2:1, and it is used as the filling material for the slow oxygen release layer after mixing.

[0054] The preparation method of the catalytic oxidation composite carrier is as follows: After mixing the activated carbon and the inorganic oxide composite soil treated at 900°C evenly, adding the alkali-soluble hydroxyethyl cellulose fiber chopped shred slurry with a mass content of 15% and mixing evenly, and then adding the mass content 30% sodium silicate binder was k...

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Abstract

The invention relates to a permeable reactive barrier and a method for repairing polluted underground water by the permeable reactive barrier. The structure mainly comprises slow oxygen release layers and catalytic oxidation layers, wherein a slow oxygen release layer is laid from the bottom, then a catalytic oxidation layer is laid; the layers are similarly laid in an alternative manner until the permeable reactive wall body is higher than the top of the saturated aquifer; the main components of the slow oxygen release layer are CaO2 powder, attapulgite powder and coarse sand; and the main components of the catalytic oxidation layer are attapulgite powder and a catalytic oxidation catalyst. The permeable reactive barrier and the remediation method thereof provided by the invention have good chemical catalytic degradation performance, the in-situ remediation effect is improved, and efficient and stable remediation of polluted underground water can be realized.

Description

technical field [0001] The invention belongs to the technical field of groundwater restoration, and in particular relates to a permeable reaction wall and a method for restoring polluted groundwater. Background technique [0002] Groundwater is an important part of the ecological environment, an important natural resource for human survival, and supports human agricultural planting and industrial production activities. With the development of the global economy, petroleum has become an indispensable energy source for human beings. At present, petroleum pollution has become a worldwide environmental problem, especially in recent years, the petroleum hydrocarbon pollution of groundwater has received more and more attention. [0003] Among petroleum hydrocarbon-contaminated groundwater remediation technologies, permeable reactive wall (PRB) technology is currently a relatively mature and widely used in-situ remediation technology for contaminated groundwater. The core of PRB ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00C02F1/28C02F1/72C02F103/06C02F101/30
CPCB09C1/002C02F1/281C02F1/725C02F2103/06C02F2101/30C02F2209/02C02F2209/06
Inventor 徐佰青蒋广安单广波赵越
Owner CHINA PETROLEUM & CHEM CORP
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