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Permeation type reactive barrier and construction method and maintenance method thereof

A construction method and technology of reaction walls, applied in the field of reaction walls, can solve the problems of explosion, easy occurrence of dust, low permeability coefficient, etc., and achieve the effects of low construction cost, control of permeability coefficient, and simple and convenient construction process

Pending Publication Date: 2022-04-05
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the need for active filler materials with smaller particle sizes in the prior art for soils with low permeability coefficients when building a reaction wall, which causes them to easily appear during storage, transportation and construction. Disadvantages of Dust Explosion Risk

Method used

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  • Permeation type reactive barrier and construction method and maintenance method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] This embodiment provides a permeable reaction wall, such as figure 1As shown, including trench 1, active packing and circulation well system. The groove 1 is suitable for accommodating active filler, and the active filler is filled in the groove 1 to form the main body of the permeable reaction wall. The circulation well system is placed in the trench 1 and is suitable for transporting bacterial liquid into the pores of the active filler. The circulating well system includes a liquid suction pipe 2 and a liquid delivery pipe 3 . The liquid suction tube 2 is vertically fixed in the groove 1, one end extends to the bottom of the groove 1, and the other end is suitable for connecting to a liquid suction pump (not shown in the figure); the liquid outlet of the infusion tube 3 is arranged in the groove 1 , the liquid inlet of the infusion tube 3 is suitable for connecting with an infusion pump (not shown in the figure). There are multiple liquid outlets on the infusion tu...

Embodiment 2

[0056] The osmotic reaction wall provided by this embodiment is consistent with embodiment 1, and its construction method is example with the osmotic reaction wall of repairing nitrate, ammonium salt and sulfate:

[0057] The particle size of the active filler used in this example is 120 mesh, and the active filler includes 85 parts by weight of the main material and 15 parts of the auxiliary material, wherein the main material includes 70 parts of fine sand, 10 parts of zeolite and 5 parts of ceramsite, and the auxiliary material is 60 parts Purpose Calcium Chloride;

[0058] The preparation method of the bacterial liquid used in this embodiment is: put into water the dosage of Bacillus pasteurianus bacteria powder to be 20g / L, the dosage of ammonium sulfate to be 20g / L, and the dosage of urea to be 15g / L to make a mixed solution, use dilute sulfuric acid and ammonia water at a concentration of 0.1mol / L to adjust the pH of the mixed solution to 7.5, and ferment at 25°C for 36...

Embodiment 3

[0067] The osmotic reaction wall provided by this embodiment is consistent with embodiment 1, and its construction method is example with the osmotic reaction wall of repairing nitrate, ammonium salt and sulfate:

[0068] The particle size of the active filler used in this example is 80 mesh, and the active filler includes 95 parts by weight of the main material and 5 parts of the auxiliary material, wherein the main material includes 65 parts of fine sand, 20 parts of zeolite and 10 parts of ceramsite, and the auxiliary material is 60 parts Purpose Calcium Chloride;

[0069] The preparation method of the bacterial liquid used in this example is: the bacterial powder dosage of Myxococcus xanthus is 20g / L, the dosage of ammonium sulfate is 20g / L, and the dosage of urea is 15g / L and put into water to prepare a mixed solution , using dilute sulfuric acid and ammonia water at a concentration of 0.1mol / L to adjust the pH of the mixture to 7.5, and fermenting at 25°C for 36 hours; ...

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Abstract

The invention provides a permeable reactive barrier as well as a construction method and a maintenance method thereof. The construction method comprises the following steps: filling a groove in which the permeable reactive barrier needs to be constructed with an active filler; filling the pores of the active filler with bacterial liquid until the permeability coefficient of the active filler is reduced to be 1-2 orders of magnitude higher than that of the surrounding soil; the active filler comprises the following components in parts by weight: 85-95 parts of a main material and 5-15 parts of an auxiliary material; the auxiliary material is soluble calcium salt; the bacterial liquid comprises a strain capable of generating urease; and the particle size of the main material is 80-120 meshes. The permeable reactive barrier is constructed by the construction method. The maintenance method comprises the step of circularly conveying an acid solution into the reactive barrier until the permeability coefficient of the reactive barrier is increased to be 1-2 orders of magnitude higher than that of surrounding soil. According to the invention, the defect in the prior art that the risk of dust explosion is easy to occur in the storage, transportation and construction processes due to the fact that active filler raw materials with small particle sizes are needed when the reactive barrier is constructed for soil with low permeability coefficient is overcome.

Description

technical field [0001] The invention relates to the field of reaction walls, in particular to a permeable reaction wall and its construction method and maintenance method. Background technique [0002] With the continuous development of my country's economy and science and technology, people pay more and more attention to environmental governance. Among them, the control of soil and groundwater pollution has also received more and more attention. As an environmental remediation and risk control technology for soil and groundwater pollution control, the permeable reactive wall has the advantages of low price and long service life. [0003] The construction method of the permeable reactive wall is generally to excavate the trench of the reactive wall first, and then fill the trench with active filler. The active filler refers to the filler loaded with active substances, which can absorb and / or purify groundwater. The substance to be purified contained in it. The groundwater...

Claims

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Application Information

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IPC IPC(8): E02D29/00E03F5/00C02F3/34
Inventor 王勇郭丽莉王祺刘亚茹李嘉晨熊静康绍果李书鹏李亚秀
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD