Desalting device and in-situ desalting system

Abstract

The invention provides a desalting device and an in-situ desalting system, and the desalting device comprises a bamboo pipe which is provided with a hollow cavity, and the two ends of the hollow cavity are arranged in a through manner along a first direction; the multiple permeation holes are formed in the bamboo pipe, one end of each permeation hole communicates with the hollow cavity, the other end of each permeation hole penetrates through the outer wall of the bamboo pipe, at least one permeation hole extends in the second direction, the second direction intersects with the first direction, and the multiple permeation holes are formed in the bamboo pipe, so that salt-containing water can enter the bamboo pipe through the multiple permeation holes; meanwhile, due to the capillary action of the vascular bundle structure, salt-containing water can be driven to migrate into the bamboo pipe, salt is gradually accumulated and crystallized in the pipe wall and the hollow cavity, the water can be evaporated into the atmosphere through the end opening of the bamboo pipe, and therefore upward pulling force is generated, migration power of the salt is increased, and the salt content is increased. And therefore, the problem of radial permeation of the bamboo is solved, and meanwhile, the salt catching amount per unit volume is remarkably increased.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering and ecological restoration technology, and in particular to a desalination device and an in-situ desalination system. Background Technology

[0002] Currently, the main technologies for treating saline-alkali land rely on chemical amendments (e.g., applying gypsum), water conservancy projects (e.g., underground pipe drainage), and biological amendments (e.g., planting salt-tolerant plants). However, these methods are costly, require large amounts of freshwater for salt leaching, use non-degradable materials, and pose a risk of secondary pollution. Summary of the Invention

[0003] This invention provides a desalination device and an in-situ desalination system to solve the problems of high cost, reliance on large amounts of fresh water for salt washing, non-degradable materials, and risk of secondary pollution in related technologies for the treatment of saline-alkali land.

[0004] This invention provides a desalination device, comprising: A bamboo tube having a hollow cavity, with both ends of the hollow cavity being connected along a first direction; Multiple permeation holes are provided in the bamboo tube. One end of each permeation hole is connected to the hollow cavity, and the other end of each permeation hole penetrates the outer wall of the bamboo tube. At least one permeation hole extends along a second direction, which intersects with the first direction.

[0005] According to a desalination device provided by the present invention, at least two of the plurality of permeation holes have different pore diameters.

[0006] According to a desalination device provided by the present invention, at least one of the permeation holes has a pore diameter of d, wherein 0.5 mm ≤ d ≤ 5 mm.

[0007] According to a desalination device provided by the present invention, a plurality of the permeation holes are distributed at intervals along the circumference of the bamboo tube; and / or At least two of the permeation holes are spaced apart along the first direction.

[0008] According to a desalination device provided by the present invention, when the plurality of permeation holes are distributed at intervals along the circumference of the bamboo tube, the plurality of permeation holes are arranged in a spiral pattern.

[0009] According to a desalination device provided by the present invention, the bamboo tube further has an adsorption layer that extends along the first direction and includes a salt adsorbent.

[0010] According to a desalination device provided by the present invention, the bamboo tube includes a first bamboo layer, a second bamboo layer and a third bamboo layer, the first bamboo layer, the second bamboo layer and the third bamboo layer are arranged along the second direction, and the second bamboo layer is located between the first bamboo layer and the third bamboo layer; The third bamboo layer has the hollow cavity, the second bamboo layer has the adsorption layer, and the two ends of each permeation pore are respectively connected to the first bamboo layer and the third bamboo layer.

[0011] According to a desalination device provided by the present invention, the salt adsorbent includes at least one of bentonite-humic acid composite gel, potassium humate, quaternary ammonium salt modifier and magnetic nano iron oxide.

[0012] According to a desalination device provided by the present invention, the bamboo tube further includes: The first bamboo segment has a first cavity; The second bamboo segment is connected to the first bamboo segment and arranged along the first direction with the first bamboo segment. The second bamboo segment has a second cavity, which is connected to the first cavity to form the hollow cavity. A plurality of permeation holes are respectively provided in the second bamboo segment.

[0013] The present invention also provides an in-situ desalination system, including the above-described desalination device.

[0014] The desalination device and in-situ desalination system provided by this invention utilize multiple permeation holes in the bamboo tube. Salt-containing water can enter the bamboo tube through these holes, breaking down the radial barrier of the bamboo. Simultaneously, due to the capillary action of the vascular bundle structure, the salt-containing water is driven to migrate into the interior of the bamboo tube, causing the salt to gradually accumulate and crystallize within the tube wall and hollow cavity. Furthermore, because the hollow cavity is interconnected, water can evaporate into the atmosphere through the ends of the bamboo tube, generating an upward pull that increases the migration force of the salt. Thus, while solving the problem of radial permeation in bamboo, this significantly increases the salt capture capacity per unit volume.

[0015] In addition, once the bamboo tube is saturated with adsorbed salt, it is pulled out and subjected to concentrated pyrolysis. The salt is effectively concentrated and fixed in the biochar framework. Through a simple water washing process, more than 98% of the fixed salt can be recovered.

[0016] Because bamboo tubes are made of biomass, no plastic pollutants are introduced during the saline-alkali land remediation process, thus avoiding secondary pollution. Furthermore, bamboo is readily available, significantly reducing operation and maintenance costs compared to other remediation methods. Simultaneously, the biochar produced from bamboo pyrolysis can be backfilled into the soil to improve its structure, and the pyrolysis gas can provide energy for the desalination system, achieving energy recycling and turning waste into treasure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the structural schematic diagrams of the desalination device provided by the present invention.

[0019] Figure 2 This is the second schematic diagram of the desalination device provided by the present invention.

[0020] Figure label: 1: Desalination device; 10: Bamboo tube; 11: Hollow cavity; 12: Adsorption layer; 13: First bamboo layer; 14: Second bamboo layer; 15: Third bamboo layer; 16: First bamboo node; 162: First cavity; 17: Second bamboo node; 172: Second cavity; 20: Permeation hole; 3: Saline-alkali soil layer; 4: Salt crystal; Z: First direction; X: Second direction. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] The following is combined Figure 1 and Figure 2 The desalination apparatus and in-situ desalination system of the present invention are described.

[0023] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment provides a desalination device 1, which includes a bamboo tube 10 and a plurality of permeation holes 20. The bamboo tube 10 has a hollow cavity 11 extending along a first direction Z, with both ends of the hollow cavity 11 being open-ended. A plurality of permeation holes 20 are disposed on the bamboo tube 10, with one end of each permeation hole 20 communicating with the hollow cavity 11 and the other end of each permeation hole 20 penetrating the outer wall of the bamboo tube 10. At least one permeation hole 20 extends along a second direction X. The second direction X intersects the first direction Z.

[0024] The desalination device 1 of this embodiment includes a bamboo tube 10 and a plurality of permeation holes 20. Specifically, the bamboo tube 10 has a hollow cavity 11, and the two ends of the hollow cavity 11 are connected along the first direction Z. When treating saline-alkali land, the bamboo tube 10 is vertically inserted into the saline-alkali soil layer 3, with one end of the bamboo tube 10 exposed, thereby forming a continuous water transmission channel.

[0025] Understandably, bamboo tube 10 is a biomass material with a longitudinally extending vascular bundle structure in its tube wall, possessing extremely strong capillary pumping potential. However, due to the dense nature of its outer skin, natural bamboo has low radial permeability, thus limiting the amount of salt deposited.

[0026] By creating multiple permeation holes 20 on the bamboo tube 10, salt-containing water can enter the bamboo tube 10 through these holes, breaking the radial barrier of the bamboo. Simultaneously, due to the capillary action of the vascular bundle structure, the salt-containing water can be driven to migrate into the interior of the bamboo tube 10, causing the salt to gradually accumulate and crystallize within the tube wall and the hollow cavity 11. Furthermore, because the hollow cavity 11 is interconnected, water can evaporate into the atmosphere through the ends of the bamboo tube 10, generating an upward pull that increases the migration force of the salt. Thus, while solving the problem of radial permeation in bamboo, the salt capture capacity per unit volume is significantly increased.

[0027] In addition, once the bamboo tube 10 is saturated with adsorbed salt, the bamboo tube 10 is pulled out and subjected to concentrated pyrolysis. The salt is effectively concentrated and fixed in the biochar framework. Through a simple water washing process, more than 98% of the fixed salt can be recovered.

[0028] Because bamboo tube 10 is a biomass material, it does not introduce plastic pollutants during the saline-alkali land remediation process, avoiding secondary pollution, and is also biodegradable. Furthermore, bamboo is readily available, significantly reducing operation and maintenance costs compared to other remediation methods. Simultaneously, the biochar produced from bamboo pyrolysis can be backfilled into the soil to improve its structure, and the pyrolysis gas can provide energy for the desalination system, achieving energy recycling and turning waste into treasure.

[0029] Optionally, the first direction Z is the axial direction of the bamboo tube 10. The second direction X is the radial direction of the bamboo tube 10.

[0030] Optionally, the temperature during pyrolysis is 300℃~450℃.

[0031] It is worth noting that layer 3 of the saline-alkali soil contains salt (Na₂O₃). + Cl - ) soil.

[0032] In some embodiments, at least two of the plurality of permeable holes 20 have different pore sizes.

[0033] In this embodiment, since at least two permeation holes 20 have different pore diameters, that is, at least one permeation hole 20 has a larger pore diameter and at least one permeation hole 20 has a smaller pore diameter.

[0034] Understandably, the larger pore size of the permeable pores 20 can accelerate water migration, promote water evaporation, and enhance the migration momentum of salt. Conversely, the smaller pore size of the permeable pores 20 is conducive to salt adsorption, thereby further increasing the salt capture capacity.

[0035] In some embodiments, the diameter of at least one permeation hole 20 is d, wherein 0.5 mm ≤ d ≤ 5 mm.

[0036] In this embodiment, the range of values ​​for the pore diameter of the permeation pore 20 is defined. Specifically, the pore diameter of the permeation pore 20 is between 0.5 mm and 5 mm.

[0037] Understandably, if the pore size of the permeation pore 20 is too large, it will affect the bamboo tube 10's ability to adsorb salt. If the pore size of the permeation pore 20 is too small, it will affect the ability of water to migrate into the bamboo tube 10. By limiting the pore size of the permeation pore 20 to between 0.5 mm and 5 mm, a balance can be achieved between salt adsorption capacity and water migration capacity.

[0038] Optionally, the pore size of the permeation hole 20 can be any one of 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm and 5 mm.

[0039] In some embodiments, a plurality of permeation holes 20 are distributed at intervals along the circumference of the bamboo tube 10; and / or at least two permeation holes 20 are distributed at intervals along a first direction Z.

[0040] In this embodiment, multiple permeation holes 20 are arranged at intervals along the circumference of the bamboo tube 10, or at least two permeation holes 20 are arranged at intervals along the first direction Z, or multiple permeation holes 20 are arranged at intervals along the circumference of the bamboo tube 10, and at least two permeation holes 20 are arranged at intervals along the first direction Z. The specific arrangement can be customized according to actual needs.

[0041] Because there are multiple permeation pores 20, the radial shielding of the bamboo is broken, the transverse water permeation is increased, and the salt capture capacity per unit volume is improved.

[0042] In some embodiments, such as Figure 2 As shown, when multiple permeation holes 20 are distributed at intervals along the circumference of the bamboo tube 10, the multiple permeation holes 20 are spirally distributed.

[0043] In this embodiment, since the multiple permeation pores 20 are spirally distributed, the problem of radial permeation of bamboo can be solved while minimizing damage to the vascular bundle structure inside the bamboo tube 10, thus ensuring the adsorption capacity for salt.

[0044] In some embodiments, such as Figure 2 As shown, the bamboo tube 10 also has an adsorption layer 12, which extends along the first direction Z and includes a salt adsorbent.

[0045] In this embodiment, the bamboo tube 10 is further provided with an adsorption layer 12. Specifically, the adsorption layer 12 includes a salt adsorbent, which can enhance the adsorption of salt and increase the amount of salt captured.

[0046] Optionally, after the bamboo tube 10 is perforated, it is immersed in a functionalized adsorbent solution. Vacuum pressure impregnation loads the salt adsorbent onto the inner wall and cell gaps of the bamboo tube 10, forming an adsorption layer 12.

[0047] In some embodiments, such as Figure 2 As shown, the bamboo tube 10 includes a first bamboo layer 13, a second bamboo layer 14, and a third bamboo layer 15. The first bamboo layer 13, the second bamboo layer 14, and the third bamboo layer 15 are arranged along a second direction X, and the second bamboo layer 14 is located between the first bamboo layer 13 and the third bamboo layer 15. The third bamboo layer 15 has a hollow cavity 11, the second bamboo layer 14 has an adsorption layer 12, and the two ends of each permeation hole 20 respectively penetrate the first bamboo layer 13 and the third bamboo layer 15.

[0048] In this embodiment, the bamboo tube 10 is defined as comprising a first bamboo layer 13, a second bamboo layer 14, and a third bamboo layer 15. Specifically, the first bamboo layer 13, the second bamboo layer 14, and the third bamboo layer 15 are arranged along a second direction X, and the second bamboo layer 14 is located between the first bamboo layer 13 and the third bamboo layer 15. That is to say, the first bamboo layer 13 is the bamboo green, the second bamboo layer 14 is the bamboo flesh, and the third bamboo layer 15 is the bamboo yellow. It is understood that the density of the bamboo green and bamboo yellow is greater than that of the bamboo flesh.

[0049] Since the second bamboo layer 14 has an adsorption layer 12, it can significantly enhance the adsorption capacity for salt, thereby increasing the amount of salt captured per unit volume.

[0050] In some embodiments, the salt adsorbent includes at least one of bentonite-humic acid composite gel, potassium humate, quaternary ammonium salt modifier, and magnetic nano iron oxide.

[0051] In this embodiment, the salt adsorbent can be one or more of the following: bentonite-humic acid composite gel, potassium humate, quaternary ammonium salt modifier, and magnetic nano iron oxide.

[0052] Specifically, when the salt adsorbent is bentonite-humic acid composite gel, the adsorption capacity of this material for Na ions can reach 91.29 mg / g, making it particularly suitable for saline-alkali environments with a pH value between 6.0 and 8.5.

[0053] When potassium humate is used as the salt adsorbent, its abundant carboxyl and hydroxyl groups are used for ion exchange. While absorbing sodium ions, it can also release potassium fertilizer into the soil.

[0054] When the salt adsorbent is a quaternary ammonium salt modifier, it is effective against anions (such as Cl-). - In heavily saline-alkali land, quaternary ammonium salt groups are used to capture salt through electrostatic attraction.

[0055] When the salt adsorbent is magnetic nano-iron oxide, synergistic loading can enhance the chelation ability of heavy metal ions.

[0056] In some embodiments, such as Figure 1 As shown, the bamboo tube 10 also includes a first bamboo segment 16 and a second bamboo segment 17. The first bamboo segment 16 has a first cavity 162. The second bamboo segment 17 is connected to the first bamboo segment 16 and is arranged along the first direction Z with the first bamboo segment 16. The second bamboo segment 17 has a second cavity 172, which communicates with the first cavity 162 to form a hollow cavity 11. Multiple permeation holes 20 are respectively provided on the second bamboo segment 17.

[0057] In this embodiment, the bamboo tube 10 further includes a first bamboo segment 16 and a second bamboo segment 17. Specifically, the second bamboo segment 17 is connected to the first bamboo segment 16 and arranged along the first direction Z. Specifically, when treating saline-alkali land and vertically inserting the bamboo tube 10 into the saline-alkali soil layer 3, at least a portion of the first bamboo segment 16 is exposed outside the saline-alkali soil layer 3 to form a continuous water transport channel, accelerate water evaporation, and enhance salt migration. Multiple permeation holes 20 are respectively provided on the second bamboo segment 17 to enhance lateral water permeation.

[0058] Furthermore, since the first cavity 162 of the first bamboo section 16 and the second cavity 172 of the second bamboo section 17 are connected and form a hollow cavity 11, that is, the partition between the two bamboo sections is opened to form a hollow cavity 11.

[0059] Secondly, this embodiment provides an in-situ desalination system, including the desalination device 1 of the first aspect embodiment described above. Since the in-situ desalination system shown in this embodiment includes the desalination device 1 of the first aspect embodiment described above, it possesses all the beneficial technical effects of the desalination device 1, which will not be repeated here.

[0060] In one specific embodiment, the core of the present invention lies in constructing a closed-loop treatment system of "physical pumping + chemical adsorption + pyrolysis recovery".

[0061] Structural modification (physical pumping enhancement): Longitudinal bamboo segments with perforated joints (bamboo tubes 10) are selected as carriers to create continuous air / moisture transport channels (hollow cavities 11) within the bamboo. Multilevel micropores (permeability pores 20) are created on the bamboo sidewalls (from the green part to the yellow part). It is recommended that the pore size be controlled between 0.5mm and 5mm. These pores break down the radial shielding of the bamboo, allowing saline water from the soil to directly enter the internal vascular bundle system through the sidewalls.

[0062] Impregnation pretreatment (enhanced chemical adsorption): The modified bamboo is immersed in a functionalized adsorbent solution and impregnated under vacuum pressure, so that the adsorbent is loaded onto the inner wall and cell pores of the bamboo.

[0063] Treatment process: The modified bamboo (bamboo tube 10) is vertically inserted into the saline-alkali land. The negative pressure pull generated by surface evaporation and the capillary action of the vascular bundles drive the deep brine to migrate into the bamboo. The salt (salt crystal 4) is precipitated in the bamboo cavity and fixed by the adsorbent.

[0064] Post-treatment resource utilization: After saturation, the bamboo is removed and subjected to concentrated pyrolysis. For pyrolysis parameters, it is recommended to control the temperature between 300℃ and 450℃. Within this range, salts (such as NaCl) are effectively concentrated and fixed within the biochar framework.

[0065] Salt recovery: More than 98% of fixed salt can be recovered through a simple water washing process.

[0066] Byproduct utilization: Biochar produced from bamboo pyrolysis can be backfilled into the soil to improve its structure, and pyrolysis gas can provide energy for the treatment system.

[0067] Among them, bamboo tube 10 is bamboo that has undergone perforation and impregnation treatment. Saline-alkali soil layer 3 contains salt (Na₂O₃). + Cl - The soil is transversely porous, with small pores located on the sidewalls of the bamboo tubes, allowing saline water to enter the interior of the bamboo tubes from the soil. The bamboo nodes are the natural nodal structures of bamboo.

[0068] Figure 1 The arrows inside the hollow cavity 11 indicate the direction of water flow, and the curved arrows at the ends of the bamboo tube 10 indicate water evaporation, generating an upward pulling force. As water continues to evaporate, salt gradually accumulates and crystallizes inside and on the inner wall of the bamboo tube 10, forming salt crystals 4.

[0069] The transverse micropores are small pores distributed in a spiral pattern on the bamboo wall, used to enhance transverse water permeability. The inner wall impregnation layer is an adsorbent layer (adsorbent layer 12) formed after vacuum impregnation treatment of the inner wall of the bamboo tube 10, used to enhance salt adsorption. The central hollow flow channel (hollow cavity 11) is a natural cavity inside the bamboo, serving as the main channel for upward transport of water and salt.

[0070] The main steps of the entire life cycle treatment are: raw bamboo - physical drilling - vacuum impregnation - vertical insertion into saline-alkali land - evaporation and salt removal and adsorption - extraction after saturation - pyrolysis treatment - recovery of biochar and salt. This reflects the environmental protection and resource utilization concept of this invention.

[0071] Beneficial effects: (1) Environmental friendliness: The carrier is a biomass material, which does not introduce plastic pollutants. (2) Low cost: Bamboo is readily available, the impregnation process is simple, and the operation and maintenance cost is much lower than that of underground salt drainage pipe networks. (3) High efficiency: Lateral opening solves the problem of radial permeation of bamboo, and chemical adsorption significantly increases the salt capture capacity per unit volume. (4) Circular economy: Turning waste into treasure, salt can be extracted, bamboo energy can be recycled, and biochar can improve the soil.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A desalination device, characterized in that, include: A bamboo tube having a hollow cavity, with both ends of the hollow cavity being connected along a first direction; Multiple permeation holes are provided in the bamboo tube. One end of each permeation hole is connected to the hollow cavity, and the other end of each permeation hole penetrates the outer wall of the bamboo tube. At least one permeation hole extends along a second direction, which intersects with the first direction.

2. The desalination device according to claim 1, characterized in that, At least two of the plurality of permeable pores have different pore diameters.

3. The desalination device according to claim 1, characterized in that, At least one of the permeation pores has a diameter of d, where 0.5 mm ≤ d ≤ 5 mm.

4. The desalination device according to claim 1, characterized in that, The plurality of permeation holes are distributed at intervals along the circumference of the bamboo tube; and / or At least two of the permeation holes are spaced apart along the first direction.

5. The desalination device according to claim 4, characterized in that, In the case where the multiple permeation holes are distributed at intervals along the circumference of the bamboo tube, the multiple permeation holes are arranged in a spiral pattern.

6. The desalination apparatus according to any one of claims 1 to 5, characterized in that, The bamboo tube also has an adsorption layer that extends along the first direction and includes a salt adsorbent.

7. The desalination apparatus according to claim 6, characterized in that, The bamboo tube includes a first bamboo layer, a second bamboo layer, and a third bamboo layer, which are arranged along the second direction, and the second bamboo layer is located between the first bamboo layer and the third bamboo layer. The third bamboo layer has the hollow cavity, the second bamboo layer has the adsorption layer, and the two ends of each permeation pore are respectively connected to the first bamboo layer and the third bamboo layer.

8. The desalination apparatus according to claim 6, characterized in that, The salt adsorbent includes at least one of bentonite-humic acid composite gel, potassium humate, quaternary ammonium salt modifier, and magnetic nano iron oxide.

9. The desalination apparatus according to any one of claims 1 to 5, characterized in that, The bamboo tube also includes: The first bamboo segment has a first cavity; The second bamboo segment is connected to the first bamboo segment and arranged along the first direction with the first bamboo segment. The second bamboo segment has a second cavity, which is connected to the first cavity to form the hollow cavity. A plurality of permeation holes are respectively provided in the second bamboo segment.

10. An in-situ desalination system, characterized in that, Includes the desalination apparatus as described in any one of claims 1 to 9.

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