Emergency Anti-seepage method for permeable reactive barrier

Abstract

An emergency anti-seepage method for a permeable reactive barrier. The method comprises: determining a construction position of a permeable reactive barrier on the basis of hydrogeological conditions of groundwater, etc., using apparatuses such as an excavator, a hydraulic grab and a continuous trenching machine to excavate a trench to an impermeable layer, and placing outer frame bodies of a front wall and a rear wall into the excavated trench; establishing water-permeable structural body frames for the front wall and the rear wall on the basis of required wall dimensions, and assembling a plurality of water-permeable structural body frames to form a permeable reactive barrier; loading reactive media into the water-permeable structural body frames to form prefabricated water-permeable walls, placing the plurality of prefabricated water-permeable walls in the outer frame bodies and assembling same to form the permeable reactive barrier, wherein a chamfer combination formed by assembling the plurality of prefabricated water-permeable walls can be directly placed into a PVC pipe to serve as a groundwater monitoring well; and when an emergency leakage event occurs and isolation is required, replacing the prefabricated water-permeable walls with prefabricated water-impermeable walls. Thus, migration of contaminants can be effectively blocked, and uncontrollable leakage of contaminant sources is avoided.

Description

A method for emergency seepage prevention using a permeable reactive wall

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411895935.0, filed on December 20, 2024, entitled "A Method for Emergency Seepage Prevention of a Permeable Reactive Wall", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of permeable reactive barrier technology, specifically a method for emergency seepage prevention using a permeable reactive barrier. Background Technology

[0004] Groundwater pollution in my country has become increasingly severe due to industrialization, seriously impacting human health. The remediation and risk management of groundwater pollution are urgently needed. Permeable reactive barriers (PRBs) are widely used for groundwater risk management and remediation in operating and decommissioned chemical industrial parks and landfills due to their advantages of high remediation efficiency, readily available materials, and low risk of secondary pollution. However, PRBs are prone to problems such as filler blockage and surface passivation during actual use. To facilitate filler replacement, Chinese patent application CN111807437A discloses a modular PRB remediation method with environmental risk management functions; Chinese patent application CN118307085A discloses a prefabricated permeable reactive barrier structure with quick replacement and its usage method. Both applications utilize modular and easily replaceable filler permeable reactive barriers for filler replacement, but they have the following drawbacks:

[0005] These modular and easily replaceable permeable reactive barriers enable rapid replacement of the reactive packing material, but they do not consider the possibility of uncontrollable pollution source leaks in production areas where permeable reactive barriers have been built, and thus cannot effectively block the migration of groundwater pollutants.

[0006] Therefore, we propose an emergency seepage prevention method using a permeable reactive wall to solve the above problems. Summary of the Invention

[0007] The purpose of this application is to provide a method for emergency seepage prevention using a permeable reactive wall, in order to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this application provides the following technical solution: a method for emergency seepage prevention using a permeable reactive barrier, comprising the following steps:

[0009] Step 1: Determine the location of the permeable reactive wall based on the groundwater hydrogeological conditions, and excavate trenches down to the impermeable layer using equipment such as excavators, hydraulic grabs, and continuous excavators. Place the outer frame of the front wall and the rear wall into the excavated trench.

[0010] Step 2: Based on the required wall dimensions, construct a permeable structural frame for the front and rear walls, and then use multiple permeable structural frames to splice together to form a permeable reactive wall.

[0011] Step 3: The reactive filler is loaded into the permeable structure frame to form a prefabricated permeable wall. Multiple prefabricated permeable walls are placed on the outer frame to form a permeable reactive wall. The chamfered combination of multiple prefabricated permeable walls can be directly used as a groundwater monitoring well by inserting PVC white pipes and screen pipes.

[0012] Step 4: When an emergency leak occurs and containment is required, replace the precast permeable wall with a precast non-permeable wall.

[0013] Optionally, the reaction wall in step one can be a continuous wall or a water gate.

[0014] Optionally, in step two, the permeable structural frame of the front and rear walls uses a pressure of 70-150 kg / m³. 3 It is made by mixing cement with gravel or crushed stone, and the thickness of the pre-constructed wall in step two is within 20cm.

[0015] Optionally, the cement is of grade 42.5MPa or 52.5MPa, and the gravel or crushed stone is 10-20mm.

[0016] Optionally, in step four, the size of the prefabricated impermeable wall is the same as that of the prefabricated permeable wall. The prefabricated impermeable wall is made of concrete, and the chamfered combination formed by multiple prefabricated impermeable walls serves as a groundwater monitoring well.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] This application utilizes a specially shaped permeable structural frame to form a permeable wall. After being assembled using chamfered shapes, PVC white pipes and screens can be directly inserted to form a groundwater monitoring well, eliminating the need for further drilling within the permeable reactive wall to construct groundwater monitoring wells. In this application, the prefabricated wall can serve as both a reactive wall and a safety wall. In the event of an emergency pollution leak at the operating enterprise, replacing the prefabricated permeable structural wall with a prefabricated non-permeable wall can effectively block the migration of pollutants and prevent uncontrollable pollution source leaks. Attached Figure Description

[0019] Figures 1a and 1b are schematic diagrams of wall construction in the first, second and third embodiments of this application;

[0020] Figure 2 is a schematic diagram of the shape and structure of the outer frame in the first, second and third embodiments of this application;

[0021] Figure 3 is a schematic diagram of the permeable structural frame in the first, second and third embodiments of this application;

[0022] Figure 4 is a top view of the prefabricated permeable wall in the first, second and third embodiments of this application;

[0023] Figure 5 is a schematic diagram of the prefabricated impermeable wall in the first, second and third embodiments of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] Example 1:

[0026] Please refer to Figures 1-5. This application provides a technical solution: a method for emergency seepage prevention using a permeable reactive barrier, comprising the following steps:

[0027] Step 1: Determine the location of the permeable reactive wall based on the groundwater hydrogeological conditions, and excavate trenches down to the impermeable layer using equipment such as excavators, hydraulic grabs, and continuous excavators. Place the outer frame of the front wall and the rear wall into the excavated trench.

[0028] Step 2: Based on the required wall dimensions, construct a permeable structural frame for the front and rear walls. Multiple permeable structural frames are spliced ​​together to form a permeable reactive wall. The provided permeable structural frame has good permeability, strength, and corrosion resistance. High permeability ensures that the natural groundwater flow field will not change, and high strength and corrosion resistance ensure that the structural frame can be reused.

[0029] Step 3: The reactive filler is loaded into the permeable structural frame to form a prefabricated permeable wall. Multiple prefabricated permeable walls are placed on the outer frame to form a permeable reactive wall. The chamfered combination of multiple prefabricated permeable walls serves as a groundwater monitoring well. The permeable wall formed by the specially shaped permeable structural frame can be directly used as a groundwater monitoring well by placing PVC white pipes and screen pipes in the chamfered shape. There is no need to continue to construct groundwater monitoring wells using drilling rigs inside the permeable reactive wall.

[0030] Step 4: When an emergency leak occurs and containment is required, the prefabricated permeable wall is replaced with a prefabricated impermeable wall. The prefabricated wall can serve as a reactive wall or a safety wall. When an emergency pollution leak occurs in a production enterprise, replacing the prefabricated permeable wall with a prefabricated impermeable wall can effectively block the migration of pollutants and prevent uncontrollable pollution source leaks.

[0031] Example 2:

[0032] Please refer to Figures 1-5, which are the second embodiment of this application. This embodiment is based on the previous embodiment. In step one, the reaction wall can be a continuous wall or a water guide gate.

[0033] In step two, the permeable structural frame for the front and rear walls uses 70-150 kg / m³. 3 It is made by mixing cement with gravel or crushed stone, and the thickness of the pre-constructed wall in step two is within 20cm.

[0034] The cement is of grade 42.5MPa or 52.5MPa, and the gravel or crushed stone is 10-20mm.

[0035] In step four, the size of the prefabricated impermeable wall is the same as that of the prefabricated permeable wall. The material of the prefabricated impermeable wall is concrete. The chamfered combination formed by multiple prefabricated impermeable walls can be directly used as a groundwater monitoring well by inserting PVC white pipes and screen pipes.

[0036] Example 3:

[0037] Please refer to Figures 1-5, which are the second embodiment of this application. This embodiment is based on the previous embodiment. This application uses a permeable structural frame with a special shape to form a permeable wall. After being combined with the chamfered shape, PVC white pipes and screen pipes can be directly installed to serve as groundwater monitoring wells. There is no need to continue to construct groundwater monitoring wells using drilling rigs within the permeable reactive wall. In this application, the prefabricated wall can serve as a reactive wall or a safety wall. When an emergency pollution leak occurs in the production enterprise, the prefabricated permeable structural wall can be replaced with a prefabricated non-permeable wall, which can effectively block the migration of pollutants and avoid uncontrollable pollution source leakage.

[0038] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for emergency seepage prevention using a permeable reactive barrier, characterized in that, Includes the following steps: Step 1: Determine the location of the permeable reactive wall based on the groundwater hydrogeological conditions, and excavate trenches down to the impermeable layer using equipment such as excavators, hydraulic grabs, and continuous excavators. Place the outer frame of the front wall and the rear wall into the excavated trench. Step 2: Based on the required wall dimensions, construct a permeable structural frame for the front and rear walls, and then use multiple permeable structural frames to splice together to form a permeable reactive wall. Step 3: The reactive filler is loaded into the permeable structure frame to form a prefabricated permeable wall. Multiple prefabricated permeable walls are placed on the outer frame to form a permeable reactive wall. The chamfered combination of multiple prefabricated permeable walls can be directly inserted into a PVC pipe as a groundwater monitoring well. Step 4: When an emergency leak occurs and containment is required, replace the precast permeable wall with a precast non-permeable wall.

2. The method for emergency seepage prevention using a permeable reactive barrier according to claim 1, characterized in that: In step one, the reaction wall can be either a continuous wall or a water-guiding gate.

3. The method for emergency seepage prevention using a permeable reactive barrier according to claim 2, characterized in that: In step two, the permeable structural frame of the front and rear walls uses a strength of 70-150 kg / m². 3 It is made by mixing cement with gravel or crushed stone, and the thickness of the pre-constructed wall in step two is within 20cm.

4. The method for emergency seepage prevention using a permeable reactive barrier according to claim 3, characterized in that: The cement is of grade 42.5MPa or 52.5MPa, and the gravel or crushed stone is 10-20mm.

5. The method for emergency seepage prevention using a permeable reactive barrier according to claim 1, characterized in that: In step four, the size of the prefabricated impermeable wall is the same as that of the prefabricated permeable wall. The prefabricated impermeable wall is made of concrete. The chamfered combination formed by multiple prefabricated impermeable walls can be directly used as a groundwater monitoring well by inserting PVC white pipes and screen pipes.

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