Blocking and processing system for important nuclides in radioactive nuclear polluted water

Abstract

The invention discloses a system for blocking and treating important nuclides in radioactive nuclear polluted water, which comprises a separating wall and a permeable reactive barrier, the separating wall is arranged between a nuclear energy facility and a river along the bank, is vertical to the flow direction of radioactive sewage, and is used for blocking the radioactive nuclear polluted water; moreover, a notch is formed in the separating wall, and the permeable reactive wall is distributed in the notch and is used for purifying radionuclides and non-radioactive heavy metals in the radioactive nuclear polluted water. According to the invention, radionuclides and non-radioactive heavy metals in radioactive nuclear sewage can be effectively removed, and contributions are made to nuclear sewage treatment under nuclear emergency conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater pollution control and restoration in nuclear contaminated sites, and in particular to a system for blocking and treating important nuclides in radioactive nuclear contaminated water. Background Art

[0002] After the nuclear leak accident, the control, isolation and treatment of radioactive nuclear contaminated water in nuclear emergency situations have attracted widespread attention. Once the nuclear contaminated water is discharged, the radioactive nuclides such as cesium, strontium and tritium contained in it will have a severe impact on the ecological environment.

[0003] Frozen soil isolation wall technology can block nuclear wastewater, but the cost of this isolation technology is very high. Hungary has used zero-valent iron as a reaction material for a permeable reaction wall to treat and repair groundwater uranium contamination in abandoned uranium mines, but this method cannot treat radioactive nuclides such as cesium, strontium and tritium. Conventional sewage treatment methods can only treat non-radioactive heavy metals, but cannot treat radioactive nuclides in radioactive nuclear contaminated water. Therefore, it is urgent to propose a technology that can block and repair nuclear wastewater in nuclear emergency situations. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a blocking and treatment system for important radionuclides in radioactive nuclear contaminated water in view of the above-mentioned deficiencies in the prior art, which can effectively remove radioactive nuclides and non-radioactive heavy metals in radioactive nuclear contaminated water and contribute to the treatment of nuclear contaminated water in nuclear emergency situations.

[0005] The technical solution of the present invention to solve the above technical problems is:

[0006] The present invention provides a blocking and treatment system for important nuclides in radioactive nuclear contaminated water, comprising an isolation wall and a permeable reaction wall. The isolation wall is arranged along the coast between nuclear power facilities and rivers and is perpendicular to the flow direction of radioactive sewage to block the radioactive nuclear contaminated water; and a gap is opened in the isolation wall, and the permeable reaction wall is arranged in the gap to purify the radioactive nuclides and non-radioactive heavy metals in the radioactive nuclear contaminated water.

[0007] Optionally, the permeable reaction wall includes a buffer filler layer and a reactive filler layer, the buffer filler layer is arranged on a side facing the flow direction of the radioactive nuclear contaminated water, and the reactive filler layer is arranged on the other side facing away from the flow direction of the radioactive nuclear contaminated water.

[0008] Optionally, the reactive filler layer is a multilayer structure, including a first-level reactive filler layer, a second-level reactive filler layer, a third-level reactive filler layer and a fourth-level reactive filler layer, wherein:

[0009] The first-stage reactive filler layer is arranged on the upstream side close to the buffer filler layer, and uses zeolite modified by copper nitrate / nickel nitrate solution and potassium ferrocyanide solution as filler to adsorb radioactive nuclides cesium and strontium, as well as non-radioactive heavy metal elements such as lead, iron, zinc, and nickel;

[0010] The second-stage reactive filler layer is disposed on the downstream side of the first-stage reactive filler layer, and uses a mixture of granular lanthanum nickel aluminum manganese alloy and silver-impregnated activated carbon as filler to adsorb tritium and iodine;

[0011] The third-stage reactive filler layer is arranged at the downstream side of the second-stage reactive filler layer, and uses an attapulgite / polypyrrole composite material as filler for adsorbing chromium;

[0012] The fourth-stage reactive filler layer is arranged on the downstream side of the third-stage reactive filler layer, and uses activated carbon and nano-hydroxyapatite modified by β-catechin, sodium nitrite and sodium hydroxide as fillers to adsorb cobalt and non-radioactive heavy metal elements such as lead, iron, zinc, and nickel.

[0013] Optionally, the thickness of the middle portion of the first-level reactive filler layer, the second-level reactive filler layer, the third-level reactive filler layer and the fourth-level reactive filler layer is greater than the thickness of the two side portions.

[0014] Optionally, the buffer filler layer is made of one or both of coarse gravel and gravel.

[0015] Optionally, the permeability coefficients of the buffer filler layer and the reactive filler layer are greater than or equal to the permeability coefficient of the aquifer.

[0016] Optionally, the permeable reaction wall further comprises a modular grid, the buffer filler layer and the reactive filler layer are respectively pre-filled in the modular grid, and the permeable reaction wall is detachably mounted in the gap on the isolation wall through the grid.

[0017] Optionally, the permeable reaction wall is provided with support outside.

[0018] Optionally, the isolation wall has a permeability coefficient of 1×10 -10 ~1×10 -8 It is formed by filling with extremely low permeability isolation material of cm / s.

[0019] Optionally, the heights of the isolation wall and the permeable reaction wall are both higher than the water level of the radioactive nuclear contaminated water after heating, and the upper surfaces of the isolation wall and the permeable reaction wall remain flush.

[0020] Beneficial effects:

[0021] The blocking and treatment system of important nuclides in radioactive nuclear contaminated water of the present invention can make the water level of radioactive nuclear contaminated water continuously rise by the isolation wall, and can operate autonomously by using the head difference to drive the radioactive nuclear contaminated water to overflow into the permeable reaction wall, where it can be smoothly purified and flow downstream, which can not only effectively remove the radioactive nuclides and non-radioactive heavy metals in the radioactive nuclear contaminated water, and contribute to the treatment of nuclear contaminated water in nuclear emergency situations, but also does not require external force and is easy to operate and maintain. In addition, by setting up monitoring wells, the life of each layer of filler and the quality of groundwater treatment can be monitored for timely replacement; the modular design of the permeable reaction wall can achieve rapid filling and disassembly, facilitate maintenance and replacement, and extend the service life of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a system for blocking and treating important nuclides in radioactive nuclear contaminated water in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of the cross section at AA in the middle;

[0024] Figure 3 for Figure 1 Schematic diagram of the cross section at BB in the middle.

[0025] In the figure: 1. Isolation wall; 2. Permeable reactive wall; 3. Extremely low permeability isolation material; 4. Buffer filler layer; 5. First-level reactive filler layer; 6. Second-level reactive filler layer; 7. Third-level reactive filler layer; 8. Fourth-level reactive filler layer; 9. Monitoring well; 10. Underground impermeable layer. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0027] In view of the fact that there is no complete design and technology specifically used for blocking and treating important nuclides in radioactive nuclear contaminated water in the world at present, and the common sewage treatment means in the prior art have technical problems such as inability to remove radioactive nuclides when blocking and treating important nuclides in radioactive nuclear contaminated water, the present invention provides a system for blocking and treating important nuclides in radioactive nuclear contaminated water, including an isolation wall and a permeable reaction wall, wherein the isolation wall is arranged along the coast between nuclear power facilities and rivers and is perpendicular to the flow direction of radioactive sewage to block radioactive nuclear contaminated water; and a gap is opened in the isolation wall, and the permeable reaction wall is arranged in the gap to purify radioactive nuclides and non-radioactive heavy metals in the radioactive nuclear contaminated water.

[0028] Example 1

[0029] like Figures 1 to 3 As shown, this embodiment discloses a blocking and treatment system for important nuclides in radioactive nuclear contaminated water under nuclear emergency conditions, including an isolation wall 1 and a permeable reaction wall 2, wherein:

[0030] The isolation wall 1 is laid along the coast between the nuclear power facility and the river and is perpendicular to the flow direction of the radioactive sewage to control and block the radioactive nuclear contaminated water;

[0031] In addition, a gap is opened on the isolation wall 1, and a permeable reaction wall 2 is arranged in the gap to purify radioactive nuclides and non-radioactive heavy metals in radioactive nuclear contaminated water.

[0032] Specifically, the permeable reaction wall 2 includes a buffer filler layer 4 and a reactive filler layer, wherein: the buffer filler layer 4 is arranged on the side facing the flow direction of the radioactive nuclear contaminated water, that is, at the frontmost part of the permeable reaction wall, so as to reduce the flow rate of the radioactive nuclear contaminated water, protect the reactive filler layer, and prevent it from being penetrated by the water flow (especially for shallow areas, where the stress level is low and it is easy to be penetrated), and can also improve the efficiency of radioactive nuclides being adsorbed and purified by the reactive filler layer; the reactive filler layer is arranged on the other side facing away from the flow direction of the radioactive nuclear contaminated water, that is, behind the buffer filler layer 4 in the permeable reaction wall 2, so as to purify the radioactive nuclides and non-radioactive heavy metals in the radioactive nuclear contaminated water.

[0033] In some embodiments, the reactive filler layer is a multi-layer structure of multi-level reactive fillers compactly packed in layers, including a first-level reactive filler layer 5, a second-level reactive filler layer 6, a third-level reactive filler layer 7 and a fourth-level reactive filler layer 8, wherein:

[0034] The first-stage reactive filler layer 5 is arranged on the upstream side close to the buffer filler layer 4. It uses zeolite modified by copper nitrate / nickel nitrate solution and potassium ferrocyanide solution as filler to adsorb radioactive nuclides cesium and strontium, as well as non-radioactive heavy metal elements such as lead, iron, zinc, nickel, etc.

[0035] In this embodiment, the zeolite modified by the copper nitrate / nickel nitrate solution and the potassium ferrocyanide solution can be prepared by the following method: 1 kg of the cleaned zeolite is added to a copper nitrate / nickel nitrate solution with a concentration of 2 mol / L, and oscillated at a constant temperature of 30°C in a shaker for 4 hours, then washed with distilled water 5 times, and then dried at 100°C; the treated zeolite is added to a potassium ferrocyanide solution (whose concentration is 0.5 times that of the copper nitrate / nickel nitrate solution), the above operation is repeated, and the mixture is dried to prepare enough modified zeolite.

[0036] The second-stage reactive filler layer 6 is arranged on the downstream side of the first-stage reactive filler layer 5. It adopts a mixture of granular lanthanum nickel aluminum manganese alloy and silver-impregnated modified activated carbon as filler to adsorb radioactive nuclides tritium and iodine. Specifically, the lanthanum nickel aluminum manganese alloy particles adsorb tritium, and the silver-impregnated modified activated carbon adsorbs iodine.

[0037] In this embodiment, the granular lanthanum nickel aluminum manganese alloy and the silver impregnated modified activated carbon mixture can be prepared by the following method:

[0038] The granular lanthanum nickel aluminum manganese alloy needs to be annealed at 1273K for 12h and then degassed at 200℃ in vacuum;

[0039] Preparation of silver-impregnated modified activated carbon: heating the activated carbon to boiling to accelerate the discharge of air from the pores of the activated carbon; soaking 1 kg of the treated activated carbon in 0.5 L of silver nitrate solution for 24 hours to prepare silver nitrate-treated activated carbon; placing the treated activated carbon in a short column, and removing excess liquid under suction; treating the still wet column with gaseous hydrogen chloride to convert the adsorbed silver nitrate salt into silver chloride; air-drying the treated activated carbon at room temperature for 24 hours, and then drying it in an oven at 90°C for 24 hours; then rinsing with distilled water and drying again to obtain silver-impregnated modified activated carbon;

[0040] The granular lanthanum nickel aluminum manganese alloy and the silver impregnated modified activated carbon mixture are mixed in a volume ratio of 2.5:1 to prepare the granular lanthanum nickel aluminum manganese alloy and the silver impregnated modified activated carbon mixture.

[0041] The third-stage reactive filler layer 7 is arranged on the downstream side of the second-stage reactive filler layer 6, and uses a commercially available ATP / PPy (attapulgite / polypyrrole) composite material as filler for adsorbing radioactive nuclide chromium.

[0042] The fourth-stage reactive filler layer 8 is arranged on the downstream side of the third-stage reactive filler layer 7. It uses activated carbon modified by β-catechin, sodium nitrite and sodium hydroxide and a small amount of nano-hydroxyapatite which can greatly improve the adsorption effect of radioactive isotope cobalt as fillers. The nano-hydroxyapatite is evenly distributed in the above-mentioned modified activated carbon and is used to adsorb radioactive isotope cobalt and the remaining non-radioactive heavy metal elements such as lead, iron, zinc, nickel, etc.

[0043] In this embodiment, the activated carbon modified by β-catechinol, sodium nitrite and sodium hydroxide can be prepared by the following method: 0.6 kg of activated carbon is placed in a container containing 10 L of β-catechinol, sodium nitrite and sodium hydroxide solution (the concentrations of β-catechinol, sodium nitrite and sodium hydroxide are all 1 mol / L); the container is then placed in a 95-100°C water bath and stirred for 12 hours, and after stirring, filtered, washed and dried. Repeat the above operation to prepare enough activated carbon.

[0044] In this embodiment, β-mesocatechin, sodium nitrite and activated carbon modified by sodium hydroxide are mixed with nano-hydroxyapatite in a volume ratio of 1:0.1 to prepare the desired filler.

[0045] In some embodiments, in view of the characteristics of the radionuclide contamination plume with a slightly higher concentration in the middle and slightly lower concentration on both sides, the middle parts of the first-level reactive filler layer 5, the second-level reactive filler layer 6, the third-level reactive filler layer 7 and the fourth-level reactive filler layer 8 are wider, that is, the thickness of the first-level reactive filler layer 5, the second-level reactive filler layer 6, the third-level reactive filler layer 7 and the fourth-level reactive filler layer 8 is greater in the middle part than in the two side parts, so as to increase the adsorption amount of radionuclides cesium, strontium and tritium.

[0046] In some embodiments, the buffer filler layer 4 is formed by filling one or both of coarse gravel and gravel.

[0047] In some embodiments, the permeability coefficients of the buffer filler layer 4 and the reactive filler layer need to be consistent with or even slightly larger than the permeability coefficient of the aquifer, that is, the permeability coefficients of the buffer filler layer 4 and the reactive filler layer are greater than or equal to the permeability coefficient of the aquifer to prevent radioactive nuclear contamination water from accumulating.

[0048] In this embodiment, the permeability coefficients of the buffer filler layer 4 and the reactive filler layer are both 1×10 -5 ~1×10 -2 cm / s.

[0049] In some embodiments, the permeable reaction wall 2 also includes a modular grid, and the buffer filler layer 4 and the reactive filler layer are pre-filled in the modular grid respectively. The permeable reaction wall 2 is detachably installed in the notch reserved on the isolation wall 1 through the grid. That is to say, the permeable reaction wall adopts a modular design, which can achieve rapid filling and disassembly, and is convenient for replacement and substitution.

[0050] In some embodiments, monitoring wells 9 may be provided in the buffer filler layer 4 and each level of reactive filler layer, respectively. Specifically, the monitoring wells 9 are preferably provided at the center position of the fillers in the buffer filler layer 4 and each level of reactive filler layer to monitor the life of each layer of filler and the quality of groundwater treatment so as to replace them in time.

[0051] In some embodiments, the isolation wall 1 has a permeability coefficient of 1×10 -10 ~1×10 -8 The extremely low permeability isolation material 3 of cm / s is filled and formed.

[0052] Specifically, the extremely low permeability isolation material 3 can be sand-bentonite, cement-bentonite, grouting curtain or frozen soil wall, etc. Among them, the bentonite material is preferably sodium-based bentonite, which has greater expansion than calcium-based bentonite.

[0053] In some embodiments, the base of the isolation wall 1 should penetrate through strata where seepage may exist (weathered layers, fissured rock layers, etc.), and be embedded in the underground impermeable layer 10. Grouting waterproofing and plugging measures should be used to strictly seal the bottom bedrock cracks of the contaminated site, so as to significantly reduce the permeability of the bottom of the isolation wall 1, prevent radioactive nuclear contaminated water from flowing around the wall or the bottom, and force the radioactive nuclear contaminated water to rise.

[0054] In this embodiment, the base of the isolation wall 1 is preferably embedded in the underground impermeable layer for 2 to 4 meters.

[0055] In some embodiments, the thickness of the isolation wall 1 is 1 to 3 m, and the gap is located in the upper middle part of the isolation wall (the upper part of the impermeable layer).

[0056] In some embodiments, the thickness of the permeable reaction wall 2 is 4 to 8 m. The thicker the permeable reaction wall 2 is, the longer its service life is; the smaller the water head difference is, the longer its service life is.

[0057] In some embodiments, when the depth of the permeable reaction wall 2 is greater than or equal to 5 m, a support (not shown) is provided outside the permeable reaction wall 2. When the depth of the permeable reaction wall 2 is less than 5 m, no support is required.

[0058] In some embodiments, the heights of the isolation wall 1 and the permeable reaction wall 2 are both higher than the water level of the radioactive nuclear contaminated water after the water is elevated.

[0059] In some embodiments, the isolation wall 1 is kept flush with the upper surface of the permeable reaction wall 2 to increase the overall stability and strength of the system structure and prevent the upper part of the permeable reaction wall 2 from being damaged due to stress concentration, thereby affecting the service life of the isolation wall-permeable reaction wall combination structure.

[0060] The following is a detailed description of the application of the blocking and treatment system for important nuclides in radioactive nuclear contaminated water of this embodiment based on the background of a nuclear facility site on a certain offshore plain, as follows:

[0061] The site of the nuclear facility is built on the northwest side of the intersection of two rivers. The design elevation of the site is 5.5m. After the site is leveled, due to backfilling, the groundwater level will rise. The groundwater level in the site area will be higher than the rivers on the south and east sides, so it can produce a head difference. The downstream of the river on the south side of the nuclear facility is the source of domestic water for residents. In the case of a nuclear emergency, if a pipeline leak occurs, it will have a great impact on the lives of residents. Therefore, it is necessary to purify the radioactive nuclear contaminated water to protect the river.

[0062] The blocking and treatment system for important nuclides in radioactive nuclear contaminated water of this embodiment is arranged between the nuclear facility and the river and arranged along the river bank, wherein the isolation wall 1 can block the radioactive nuclear contaminated water to protect the river from pollution; the permeable reaction wall 2 is preferably located at a lower terrain along the river bank so that the radioactive nuclear contaminated water can be gathered, thereby improving the purification efficiency of radioactive nuclides and non-radioactive heavy metals.

[0063] When a nuclear emergency occurs, the isolation wall 1 will block the radioactive nuclear contaminated water and raise the nuclear contaminated water to a position at least 0.8 meters below the setting height of the permeable reaction wall 2. When water flows out of the permeable reaction wall 2, the head upstream of the isolation wall 1 is lower than the head of the surrounding radioactive nuclear contaminated water, generating an additional head difference. As mentioned above, the plant site is backfilled, and the elevation is 5.5 meters higher than the river, which is the initial head difference. The total head difference drives the radioactive nuclear contaminated water around the isolation wall 1 to flow evenly through the permeable reaction wall 2, so that the scale of the pollution plume gradually decreases and the concentration distribution tends to be uniform, thereby improving the purification and disposal efficiency of the permeable reaction wall; there is no bypass of the radioactive nuclear contaminated water, and the efficient capture of the downstream radioactive nuclear contaminated water can be achieved.

[0064] The blocking and treatment system of important nuclides in radioactive nuclear contaminated water of this embodiment can make the water level of radioactive nuclear contaminated water continuously rise by the isolation wall, and can operate autonomously by using the head difference to drive the radioactive nuclear contaminated water to overflow into the permeable reaction wall, where it can be smoothly purified and flow downstream. It can not only effectively remove the radioactive nuclides and non-radioactive heavy metals in the radioactive nuclear contaminated water, and contribute to the treatment of nuclear contaminated water in nuclear emergency situations, but also does not require external force and is easy to operate and maintain. In addition, by setting up monitoring wells, the life of each layer of filler and the quality of groundwater treatment can be monitored for timely replacement; the modular design of the permeable reaction wall can achieve rapid filling and disassembly, facilitate maintenance and replacement, and extend the service life of the system.

[0065] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A system for blocking and treating important nuclides in radioactive nuclear contaminated water, characterized in that: Including isolation walls and permeable reaction walls, The isolation wall is arranged along the coast between the nuclear power facility and the river, and is perpendicular to the flow direction of the radioactive sewage, and is used to block the radioactive nuclear contaminated water; In addition, a gap is opened on the isolation wall, and the permeable reaction wall is arranged in the gap to purify radioactive nuclides and non-radioactive heavy metals in radioactive nuclear contaminated water.

2. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 1 is characterized in that: The permeable reaction wall comprises a buffer filler layer and a reactive filler layer, The buffer filler layer is arranged on the side facing the flow direction of the radioactive nuclear contaminated water. The reactive filler layer is arranged on the other side facing away from the flow direction of the radioactive nuclear contaminated water.

3. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 2 is characterized in that: The reactive filler layer is a multi-layer structure, including a first-level reactive filler layer, a second-level reactive filler layer, a third-level reactive filler layer and a fourth-level reactive filler layer. The first-stage reactive filler layer is arranged on the upstream side close to the buffer filler layer, and uses zeolite modified by copper nitrate / nickel nitrate solution and potassium ferrocyanide solution as filler to adsorb radioactive nuclides cesium and strontium, and non-radioactive heavy metal elements lead, iron, zinc and nickel; The second-stage reactive filler layer is disposed on the downstream side of the first-stage reactive filler layer, and uses a mixture of granular lanthanum nickel aluminum manganese alloy and silver-impregnated activated carbon as filler to adsorb tritium and iodine; The third-stage reactive filler layer is arranged at the downstream side of the second-stage reactive filler layer, and uses an attapulgite / polypyrrole composite material as filler for adsorbing chromium; The fourth-stage reactive filler layer is arranged on the downstream side of the third-stage reactive filler layer, and uses activated carbon and nano-hydroxyapatite modified by β-catechin, sodium nitrite and sodium hydroxide as fillers to adsorb cobalt and non-radioactive heavy metal elements such as lead, iron, zinc and nickel.

4. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 2 is characterized in that: The thickness of the middle portion of the first-stage reactive filler layer, the second-stage reactive filler layer, the third-stage reactive filler layer and the fourth-stage reactive filler layer is greater than the thickness of the two side portions.

5. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 2 is characterized in that: The buffer filler layer is formed by filling one or both of coarse gravel and gravel.

6. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 2 is characterized in that: The permeability coefficients of the buffer filler layer and the reactive filler layer are greater than or equal to the permeability coefficient of the aquifer.

7. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to any one of claims 1 to 6, characterized in that: The permeable reactive wall also includes modular grids, The buffer filler layer and the reactive filler layer are respectively pre-filled in the modular grid, and the permeable reactive wall is detachably mounted in the gap on the isolation wall through the grid.

8. According to the blocking and treatment system for important nuclides in radioactive nuclear contaminated water as described in claim 7, the permeable reaction wall is provided with support outside.

9. The blocking and treatment system for important nuclides in radioactive nuclear contaminated water according to claim 7, characterized in that: The isolation wall has a permeability coefficient of 1×10 -10 ~1×10 -8 It is formed by filling with extremely low permeability isolation material of cm / s.

10. According to the blocking and treatment system for important nuclides in radioactive nuclear contaminated water as described in claim 7, the heights of the isolation wall and the permeable reaction wall are both higher than the water level of the radioactive nuclear contaminated water after elevation, and the upper surfaces of the isolation wall and the permeable reaction wall remain flush.

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