Vulcanized nano zero-valent iron supported permeable reactive barrier structure

Abstract

The utility model relates to the technical field of permeable reaction walls, in particular to a sulfurized nanoscale zero-valent iron load type permeable reaction wall structure which comprises a reaction box body, a flow guide plate, a splicing block, a splicing column, a splicing groove and a clamping groove, the flow guide plate is welded to the left end face of the reaction box body, and the clamping groove is formed in the rear end face of the flow guide plate. A splicing block is welded to the right end face of the reaction box body, splicing heads of the splicing block are consistent with the clamping grooves in specification, four splicing columns are arranged on the lower end face of the reaction box body, four splicing grooves are formed in the top face of the reaction box body, and the splicing columns are consistent with the splicing grooves in specification; the device disclosed by the utility model is assembled into a wave-shaped layout, so that the flowing path of underground water can be averagely prolonged by about 40%, and the contact area and the reaction time between sewage and vulcanized nano zero-valent iron are obviously improved, so that the overall removal efficiency of pollutants is improved by 25%; and the composite material is particularly outstanding in the aspect of treating chlorinated hydrocarbon refractory organic pollutants, and shows higher repairing capacity.

Description

Sulfide nano-zero-valent iron supported permeable reactive wall structure Technical Field

[0001] This utility model relates to the field of permeable reactive wall technology, and in particular to a permeable reactive wall structure supported by sulfide nano-zero valent iron. Background Technology

[0002] Sulfide nano-zero-valent iron supported permeable reactive walls are a passive treatment technology for the remediation of contaminated soil and groundwater. They utilize nano-level zero-valent iron as the main reaction medium, which is fixed onto a porous medium through chemical or physical methods to form a permeable barrier. When pollutants flow through this barrier with groundwater, they react with the active materials therein, thereby being degraded or transformed into low-toxicity substances.

[0003] In common permeable reactive barriers, the contact area and time between pollutants and active materials are relatively small. If the groundwater flow rate is too fast, the contact time between pollutants and active materials may not be sufficient to complete a full chemical reaction. This is especially true for recalcitrant organic compounds that require a long time to degrade effectively, such as chlorinated hydrocarbons. Insufficient contact time will significantly affect the treatment effect. In some cases, groundwater flow may not pass through the reactive barrier evenly, but instead choose a path with less resistance to bypass the reactive barrier. This phenomenon is called the bypass effect or short-circuit phenomenon, which causes some polluted water to flow out directly without treatment, reducing the overall treatment efficiency.

[0004] Therefore, for the aforementioned permeable reactive walls, when the groundwater flow rate is too fast, it is difficult to complete the reaction completely, which affects the removal effect on refractory organic compounds such as chlorinated hydrocarbons. In addition, groundwater flow may bypass the reactive wall, resulting in some polluted water flowing out directly without treatment. There is an urgent need to design a new type of permeable reactive wall structure supported by sulfide nano-zero valent iron. Summary of the Invention

[0005] To overcome the common problem of permeable reactive barriers, when the groundwater flow rate is too fast, it is difficult to complete the reaction completely, which affects the removal effect on chlorinated hydrocarbons and other recalcitrant organic compounds. In addition, the groundwater flow may bypass the reactive barrier, resulting in some polluted water flowing out directly without treatment.

[0006] The technical solution of this utility model is as follows: a sulfurized nano-zero valent iron-loaded permeable reactive wall structure, including a reaction chamber and a guide plate, splicing blocks, splicing columns, splicing grooves and slots. A guide plate is welded to the left end face of the reaction chamber, and a slot is opened on the rear end face of the guide plate. A splicing block is welded to the right end face of the reaction chamber, and the splicing joint of the splicing block is consistent with the specifications of the slot. Four splicing columns are provided on the lower end face of the reaction chamber, and four splicing grooves are opened on the top surface of the reaction chamber. The specifications of the splicing columns and splicing grooves are consistent.

[0007] Preferably, the permeable reactive wall structure supported by sulfide nano-zero valent iron is modularly assembled from multiple reaction chambers using splicing blocks, splicing grooves, and splicing columns and slot components. Each reaction chamber is filled with a porous media material supported by sulfide nano-zero valent iron, possessing excellent pollutant reduction and adsorption capabilities. It can efficiently remove typical pollutants such as chlorinated hydrocarbons, heavy metal ions like hexavalent chromium, lead, and cadmium, and nitrates from groundwater. The assembled structure has a wave-like shape, which provides better hydraulic guidance and pollution remediation effects. The wave-like structure increases the path length of groundwater flow, thereby increasing the contact area and time between wastewater and the active material, sulfide nano-zero valent iron, improving the degradation efficiency of pollutants by sulfide nano-zero valent iron. The wave-like assembly structure can effectively disperse the flow direction of groundwater, avoiding short-circuiting or bypassing phenomena caused by excessively high local flow velocities, i.e., the problem of some polluted water bypassing the reaction zone without being fully treated. This ensures that more pollutants flow into the interior of the reaction chamber, improving the overall treatment effect.

[0008] Preferably, the left end face of the reaction chamber is provided with a water-swellable layer on the left wall, and the right end face of the splicing block is provided with a water-swellable layer on the right wall.

[0009] Preferably, the lower end face of the reaction chamber is provided with a bottom water-swellable layer, and the upper end face of the reaction chamber is provided with a top water-swellable layer.

[0010] Preferably, the front side of the reaction chamber is connected to a front sidewall, and a through hole is formed on the surface of the front sidewall. The rear side of the reaction chamber is connected to a rear sidewall, and a through hole is formed on the surface of the rear sidewall.

[0011] Preferably, the upper end of the reaction chamber is connected to a movable top cover, and the upper surface of the movable top cover is connected to a lifting ring.

[0012] Preferably, an opening is provided at the top surface of the water-swellable layer for the lifting ring, and a storage groove for the lifting ring is provided at the bottom surface of the reaction chamber.

[0013] Preferably, the interior of the reaction chamber is filled with reaction filler, and the front end face of the reaction chamber has a through hole three.

[0014] The beneficial effects of this utility model are:

[0015] 1. The sulfurized nano-zero-valent iron loaded permeable reactive wall is composed of multiple reaction chambers modularly assembled by splicing blocks, splicing grooves, splicing columns and slots. The overall layout is wave-shaped. Compared with the traditional structure, the groundwater flow path is extended by an average of about 40%, which greatly increases the contact area and residence time between sewage and sulfurized nano-zero-valent iron, improving the pollutant removal rate by 25%, especially for recalcitrant chlorinated hydrocarbons.

[0016] 2. In traditional structures, about 10% of groundwater bypasses the reaction zone without being fully treated. However, with the use of a wave-shaped assembly structure, this percentage can be reduced to 3%, significantly improving the problem of uneven water flow distribution, ensuring that more pollutants flow into the reaction tank, and improving the overall treatment effect of the system. Attached Figure Description

[0017] Figure 1 shows a three-dimensional structural diagram of the permeable reactive wall structure supported by sulfide nano-zero valent iron of this utility model.

[0018] Figure 2 shows a three-dimensional structural diagram of the location of the lifting ring of the sulfurized nano-zero-valent iron-loaded permeable reactive wall structure of this utility model.

[0019] Figure 3 shows a three-dimensional disassembled structural diagram of the sulfurized nano-zero-valent iron-loaded permeable reactive wall structure of this utility model.

[0020] Figure 4 shows a three-dimensional structural diagram of the location of the storage tank of the sulfurized nano-zero-valent iron-loaded permeable reactive wall structure of this utility model.

[0021] Figure 5 shows a three-dimensional cross-sectional view of the reaction chamber of the sulfurized nano-zero-valent iron-supported permeable reaction wall structure of this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Reaction chamber; 2. Front side wall; 3. Rear side wall; 4. Baffle plate; 5. Water-swellable layer on the left wall; 6. Splicing block; 7. Water-swellable layer on the right wall; 8. Water-swellable layer at the bottom; 9. Water-swellable layer at the top; 10. Splicing column; 11. Splicing groove; 12. Storage groove; 13. Opening; 14. Movable top cover; 15. Lifting ring; 16. Reaction packing; 17. Through hole one; 18. Through hole two; 19. Through hole three; 20. Slot. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please refer to Figures 1-5. This utility model provides an embodiment: a sulfurized nano-zero-valent iron-loaded permeable reactive wall structure, including a reaction chamber 1, a guide plate 4, splicing blocks 6, splicing columns 10, splicing grooves 11, and slots 20. A guide plate 4 is welded to the left end face of the reaction chamber 1, and a slot 20 is formed on the rear end face of the guide plate 4. A splicing block 6 is welded to the right end face of the reaction chamber 1, and the splicing joint of the splicing block 6 is consistent with the specifications of the slot 20. Four splicing columns 10 are provided on the lower end face of the reaction chamber 1, and four splicing grooves 11 are formed on the top surface of the reaction chamber 1. The specifications of the splicing columns 10 and the splicing grooves 11 are consistent. The sulfurized nano-zero-valent iron-loaded permeable reactive wall structure is modularly assembled from multiple reaction chambers 1 using splicing blocks 6, splicing grooves 11, and splicing columns 10 and slots 20 components. Each reaction chamber 1 is filled with negative... The porous media material loaded with sulfide nano-zero valent iron possesses excellent pollutant reduction and adsorption capabilities, effectively removing typical pollutants such as chlorinated hydrocarbons, heavy metal ions like hexavalent chromium, lead, and cadmium, and nitrates from groundwater. The assembled structure is wave-shaped, with multiple reaction tanks 1 arranged in a wave-like layout, providing superior hydraulic guidance and pollution remediation effects. The wave-like structure increases the path length of groundwater flow, thereby increasing the contact area and time between wastewater and the active material, sulfide nano-zero valent iron, enhancing the degradation efficiency of pollutants. The wave-like assembly structure effectively disperses groundwater flow, avoiding short-circuiting or bypassing phenomena caused by excessively high local flow velocities—that is, preventing some polluted water from bypassing the reaction zone without adequate treatment. This ensures that more pollutants flow into the reaction tank 1, improving the overall treatment effect.

[0025] Please refer to Figures 1-5. In this embodiment, the left end face of the reaction chamber 1 is provided with a left wall water-swellable layer 5, and the right end face of the splicing block 6 is provided with a right wall water-swellable layer 7. The water-swellable layer is water-swellable rubber. After contact with water, the water-swellable rubber expands and deforms two to three times, filling all irregular surfaces, cavities, and gaps in the joint, while generating huge contact pressure to completely prevent leakage. The left wall water-swellable layer 5 and the right wall water-swellable layer 7 are used to fill the gaps between the left and right sides of the modules. The lower end face of the reaction chamber 1 is provided with a bottom water-swellable layer 8, and the upper end face of the reaction chamber 1 is provided with a top water-swellable layer 8. The top water-swellable layer 9, bottom water-swellable layer 8, and top water-swellable layer 9 are used to fill the gaps between the modules. The front side of the reaction chamber 1 is connected to the front side wall 2, and the surface of the front side wall 2 is provided with a through hole 17. The rear side of the reaction chamber 1 is connected to the rear side wall 3, and the surface of the rear side wall 3 is provided with a through hole 2 18. The front side wall 2 serves as a sealing and protective structure. The through hole 17 allows groundwater to flow into the reaction chamber 1. The through hole 2 18 is located on the rear side of the reaction chamber 1. The rear side wall 3 is also a closed structure. The through hole 2 18 is used to drain the treated groundwater and allow the water to flow smoothly through the reaction zone.

[0026] Please refer to Figures 1-5. In this embodiment, the upper end of the reaction chamber 1 is connected to a movable top cover 14, and the upper surface of the movable top cover 14 is connected to a lifting ring 15. The movable top cover 14 is easy to install and maintain, allowing operators to easily open the top cover to fill or replace the reaction filler 16. The lifting ring 15 provides a lifting point for easy transportation and on-site installation. An opening 13 is provided at the top surface of the water-swellable layer 9 at the lifting ring 15. A storage groove 12 for storing the lifting ring 15 is provided on the lower surface of the reaction chamber 1. After assembly, the lifting ring 15 is stored in the storage groove 12 at the bottom of another module. The interior of the reaction chamber 1 is filled with reaction filler 16. A through hole 19 is provided on the front end surface of the reaction chamber 1. The reaction filler 16 is loaded with sulfide nano-zero valent iron, which has efficient reduction and adsorption capabilities and is used to remove typical pollutants such as chlorinated hydrocarbon organics and heavy metal ions.

[0027] During operation, the splicing block 6 is connected to the slot 20 of the adjacent module in the left and right directions. The splicing column 10 of the upper module is inserted into the splicing slot 11 of the lower module to complete the splicing in the upper and lower directions. During the splicing process, the gaps between the modules are filled with a water-swellable layer. The water-swellable layer is made of water-swellable rubber material, which can expand two to three times its volume after contact with water, tightly filling the gaps and forming a seal. After the modules are assembled, the overall structure is a wave-shaped structure to extend the path of groundwater flow, optimize hydraulic distribution, and improve treatment efficiency. Polluted groundwater enters the interior of the reaction chamber 1 through the through hole 17 on the front side wall 2 and the through hole 19 on the front end face of the reaction chamber 1. The interior of the reaction chamber 1 is filled with porous reaction filler 16 loaded with sulfide nano-zero valent iron, which has a high efficiency of reduction and adsorption. Pollutants such as chlorinated hydrocarbon organics, hexavalent chromium, lead, cadmium and nitrates undergo reduction, adsorption and co-precipitation chemical reactions when flowing through the filler.

[0028] Through the above steps, the wave-shaped assembly layout can extend the average path of groundwater flow by about 40%, significantly increasing the contact area and reaction time between wastewater and sulfide nano-zero valent iron, thereby improving the overall removal efficiency of pollutants by 25%. It is particularly outstanding in treating chlorinated hydrocarbons and other recalcitrant organic pollutants, demonstrating stronger remediation capabilities. At the same time, it avoids short-circuiting or bypassing phenomena caused by excessively high local flow velocities, greatly improving the problem of uneven water flow distribution. This ensures that more polluted water enters the interior of the reaction tank 1, thus solving the common problem of permeable reaction walls, where it is difficult to complete the full reaction when the groundwater flow velocity is too high, affecting the removal effect of chlorinated hydrocarbons and other recalcitrant organic pollutants. In addition, groundwater flow may bypass the reaction wall, causing some polluted water to flow out directly without treatment.

Claims

1. A permeable reactive wall structure supported by sulfide nano-zero valent iron, comprising a reaction chamber (1); characterized in that: It also includes a flow guide plate (4), splicing block (6), splicing column (10), splicing groove (11) and slot (20). The flow guide plate (4) is welded to the left end face of the reaction chamber (1). The slot (20) is opened on the rear end face of the flow guide plate (4). The splicing block (6) is welded to the right end face of the reaction chamber (1). The splicing joint of the splicing block (6) is consistent with the specification of the slot (20). Four splicing columns (10) are provided on the lower end face of the reaction chamber (1). Four splicing grooves (11) are opened on the top surface of the reaction chamber (1). The specifications of the splicing column (10) and the splicing groove (11) are consistent.

2. The sulfurized nano-zero-valent iron supported permeable reactive wall structure according to claim 1, characterized in that: The left end face of the reaction chamber (1) is provided with a water-swellable layer (5), and the right end face of the splicing block (6) is provided with a water-swellable layer (7).

3. The sulfurized nano-zero-valent iron supported permeable reactive wall structure according to claim 2, characterized in that: The lower end face of the reaction chamber (1) is provided with a bottom water-swellable layer (8), and the upper end face of the reaction chamber (1) is provided with a top water-swellable layer (9).

4. The sulfurized nano-zero-valent iron supported permeable reactive wall structure according to claim 3, characterized in that: The front side of the reaction chamber (1) is connected to a front side wall (2), and a through hole (17) is opened through the surface of the front side wall (2). The rear side of the reaction chamber (1) is connected to a rear side wall (3), and a through hole (18) is opened through the surface of the rear side wall (3).

5. The sulfidized nano zero-valent iron loaded permeable reactive barrier structure according to claim 4, wherein: The upper end of the reaction chamber (1) is connected to a movable top cover (14), and the upper end face of the movable top cover (14) is connected to a lifting ring (15).

6. The sulfurized nano-zero-valent iron supported permeable reactive wall structure according to claim 5, characterized in that: An opening (13) is provided at the top surface of the water-swellable layer (9) and the bottom surface of the reaction chamber (1) is provided with a storage groove (12) for storing the hanging ring (15).

7. The sulfurized nano-zero-valent iron supported permeable reactive wall structure according to claim 6, characterized in that: The interior of the reaction chamber (1) is filled with reaction filler (16), and the front end face of the reaction chamber (1) is provided with a through hole three (19).

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