A crystallization recovery device for high-salinity wastewater and a crystallization recovery method thereof

Abstract

The application discloses a crystallization recovery device and method for high-salinity wastewater. The crystallization recovery device for high-salinity wastewater comprises a liquid storage bottle, an absorbing member, a longitudinal absorbing part, a horizontal transporting part and a crystallization part. One end of the longitudinal absorbing part is inserted into the liquid storage bottle and can contact with the high-salinity wastewater therein. The other end of the longitudinal absorbing part is connected to the center of the horizontal transporting part. The crystallization part is annular and is connected to the bottom of the horizontal transporting part. A plurality of longitudinal and / or horizontal capillary tubes are arranged in the absorbing member, and each capillary tube in the absorbing member is in communication with each other. An evaporation plate is arranged on the top of the absorbing member. The evaporation plate is used for absorbing solar energy and conducting heat energy to the absorbing member. The application utilizes the capillary force to draw the high-salinity wastewater into the absorbing member, and utilizes the evaporation plate to convert the solar energy into heat energy, so that the high-salinity wastewater in the absorbing member is heated and crystallized, and the crystallization recovery treatment of the high-salinity wastewater is realized with reduced dependence on external energy.

Description

Technical Field

[0001] This application relates to the field of ecological and environmental waste recycling technology, and in particular to a crystallization recovery device and method for high-salt wastewater. Background Technology

[0002] With rapid industrial development, the direct discharge of high-concentration wastewater generated by industrial processes inevitably causes significant environmental damage. Therefore, the proper treatment of industrial wastewater is one of the current challenges. The main methods for treating industrial wastewater include: (1) chemical treatment; (2) physical treatment; (3) thermal treatment; (4) membrane separation technology; and (5) safe disposal. However, these methods all suffer from the pollution problem of discharging high-concentration wastewater after treatment and cannot fully recover the valuable salts from the solution.

[0003] With the development of high-salinity wastewater treatment technology, zero liquid discharge (ZLD) treatment of high-concentration brine is one of the most appropriate and effective methods. Its purpose is to reduce the discharge of liquid waste and recover solid salts during wastewater treatment, avoiding the risk of secondary pollution. The ZLD process consists of a concentration system and a crystallization system. Concentration systems include several types such as reverse osmosis (RO), electrodialysis, membrane distillation (MD), and mechanical vapor compression concentrators.

[0004] Currently, brine crystallization is mainly achieved through brine crystallizers or evaporation tanks. Traditional brine crystallizers use electricity or fossil fuels to heat the brine, causing a large amount of water to evaporate, resulting in high energy consumption for salt crystallization (>50 kWh m⁻³). Furthermore, salt tends to deposit at the evaporation interface, thus reducing the efficiency of subsequent salt crystallization. Analysis of existing crystallization methods shows that high-energy-consuming crystallizers significantly limit the effectiveness of salt-water crystallization (ZLD). Therefore, developing low-energy-consumption, high-efficiency evaporators is one of the main ways to overcome the current challenges. Summary of the Invention

[0005] The purpose of this application is to at least solve one of the technical problems existing in the prior art, and to provide a crystallization recovery device and method for high-salt wastewater, which can improve salt crystallization efficiency and reduce the impact of salt deposition on the evaporation interface.

[0006] According to a first aspect of this application, a crystallization recovery device for high-salinity wastewater is provided, comprising:

[0007] A storage bottle for storing high-salt wastewater;

[0008] An absorbent comprising a longitudinal absorption section, a transverse transport section, and a crystallization section, wherein one end of the longitudinal absorption section is inserted into the storage bottle and is able to contact the high-salt wastewater therein, and the other end of the longitudinal absorption section is connected to the center of the transverse transport section, and the crystallization section is annular and connected to the bottom of the transverse transport section, and the crystallization section surrounds the outside of the longitudinal absorption section.

[0009] The longitudinal absorption section is provided with a longitudinal capillary, the transverse transport section is provided with a transverse capillary, the crystallization section is provided with both longitudinal and transverse capillary, and the capillary in the absorption element is interconnected.

[0010] An evaporating plate covers the top of the absorber and is used to absorb solar energy and conduct heat energy to the absorber.

[0011] According to a first aspect embodiment of this application, the transverse transport portion is cylindrical, and the crystallization portion is annular.

[0012] According to a first aspect of the present application, the evaporation plate is further made of polypyrrole-modified dust-free paper material.

[0013] According to a first aspect of the present application, further, in the absorbent, the pore size of the longitudinally arranged capillary gradually decreases from bottom to top.

[0014] According to a first aspect of the present application, further, in the absorbent, the transversely arranged capillary is connected to the small-diameter end of the longitudinally arranged capillary.

[0015] According to a first aspect embodiment of this application, the porosity of the absorbent is further in the range of 60% to 80%.

[0016] According to a first aspect of the present application, a gap is further provided between the longitudinal absorption portion and the crystallization portion, and a locking block is provided at the top opening of the liquid storage bottle. The locking block is inserted into the gap to realize the connection between the absorption member and the liquid storage bottle.

[0017] According to the first aspect of the present application, the height of the absorbent is H, the diameter of the longitudinal absorbent is d, and the distance from the bottom of the crystallizing part to the top of the transverse transport part is h, wherein H:d = 9:1 to 45:1 and H:h = 3:2 to 9:1.

[0018] According to a first aspect embodiment of this application, a gap is further provided between the longitudinal absorption portion and the crystallization portion, the depth of the gap being l, wherein h:l = 3:1 to 12:1.

[0019] According to a second aspect of this application, a crystallization recovery method is provided, which is carried out using the crystallization recovery device for the aforementioned high-salinity wastewater, and includes the following steps:

[0020] Inject the high-salt wastewater to be recycled into the storage bottle;

[0021] The absorber is inserted into the storage bottle, so that the absorber is immersed in the high-salt wastewater;

[0022] The crystallization and recovery device for the high-salt wastewater is placed under sunlight, where the evaporation plate absorbs solar energy and converts it into heat energy.

[0023] Under the action of capillary force, high-salt wastewater rises along the longitudinal capillary of the longitudinal absorption section and is transported to the crystallization section through the transverse transport section.

[0024] The heat energy of the evaporation plate is conducted to the absorber, and the high-salt wastewater is heated and crystallized in the crystallization section, from which crystals precipitate.

[0025] The beneficial effects of the embodiments of this application include at least the following: This application uses capillary force to pump high-salt wastewater into the absorber and uses an evaporation plate to convert solar energy into heat energy, thereby causing the high-salt wastewater in the absorber to heat up and crystallize, achieving crystallization and recycling of high-salt wastewater while reducing dependence on external energy. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this application, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of the crystallization and recovery apparatus for high-salinity wastewater according to the first aspect of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the absorber 200 in the crystallization and recovery device for high-salt wastewater according to the first aspect of this application;

[0029] Figure 3 This is a two-dimensional CT image of the absorber 200 in the crystallization and recovery device for high-salt wastewater according to the first aspect of this application;

[0030] Figure 4 This is a SEM image of the vertical section of the absorber 200 in the crystallization and recovery device for high-salt wastewater according to the first aspect of this application.

[0031] Reference numerals: 100-liquid storage bottle, 110-block, 200-absorbent component, 210-longitudinal absorption section, 220-lateral transport section, 230-crystallization section, 240-gap, 300-evaporation plate. Detailed Implementation

[0032] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0033] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0036] With rapid industrial development, the direct discharge of high-concentration wastewater generated by industrial processes inevitably causes significant environmental damage. Therefore, the proper treatment of industrial wastewater is one of the current challenges. The main methods for treating industrial wastewater include: (1) chemical treatment; (2) physical treatment; (3) thermal treatment; (4) membrane separation technology; and (5) safe disposal. However, these methods all suffer from the pollution problem of discharging high-concentration wastewater after treatment and cannot fully recover the valuable salts from the solution.

[0037] With the development of high-salinity wastewater treatment technology, zero liquid discharge (ZLD) treatment of high-concentration brine is one of the most appropriate and effective methods. Its purpose is to reduce the discharge of liquid waste and recover solid salts during wastewater treatment, avoiding the risk of secondary pollution. The ZLD process consists of a concentration system and a crystallization system. Concentration systems include several types such as reverse osmosis (RO), electrodialysis, membrane distillation (MD), and mechanical vapor compression concentrators.

[0038] Currently, brine crystallization is mainly achieved through brine crystallizers or evaporation tanks. Traditional brine crystallizers use electricity or fossil fuels to heat the brine, causing a large amount of water to evaporate, resulting in high energy consumption for salt crystallization (>50 kWh m⁻³). Furthermore, salt tends to deposit at the evaporation interface, thus reducing the efficiency of subsequent salt crystallization. Analysis of existing crystallization methods shows that high-energy-consuming crystallizers significantly limit the effectiveness of salt-water crystallization (ZLD). Therefore, developing low-energy-consumption, high-efficiency evaporators is one of the main ways to overcome the current challenges.

[0039] In response, this application proposes a crystallization recovery device and method for high-salt wastewater. The device utilizes capillary force to pump the high-salt wastewater into the absorber 200, and uses the evaporation plate 300 to convert solar energy into heat energy, thereby raising the temperature of the high-salt wastewater in the absorber 200 to crystallize. This reduces dependence on external energy sources and achieves crystallization recovery of high-salt wastewater.

[0040] In this application, capillary force refers to the force that causes a liquid, whether wetted or unwetted by the capillary wall, to rise or fall naturally within a capillary. This force points in the direction of the concave surface of the liquid, and its magnitude is directly proportional to the surface tension of the liquid and inversely proportional to the capillary radius. The formula for calculating the magnitude of capillary force is as follows: Where ΔP is the pressure difference between the two ends of the capillary, h is the rising height, σ is the surface tension, θ is the contact angle, ρ is the liquid density, g is the gravitational acceleration, R is the radial radius, and r is the capillary radius.

[0041] Reference Figure 1 The crystallization and recovery device for high-salinity wastewater in the first aspect embodiment of this application includes a storage bottle 100, an absorber 200, and an evaporation plate 300. The storage bottle 100 is used to store high-salinity wastewater; the absorber 200 is used to draw the high-salinity wastewater from the storage bottle 100 and crystallize it; the evaporation plate 300 is used to absorb solar energy and convert it into heat energy to promote salt crystallization in the absorber 200.

[0042] Specifically, refer to Figure 2The absorbent 200 includes a longitudinal absorption section 210, a transverse transport section 220, and a crystallization section 230. One end of the longitudinal absorption section 210 is inserted into the storage bottle 100 and can contact the high-salt wastewater therein. The other end of the longitudinal absorption section 210 is connected to the center of the transverse transport section 220. The crystallization section 230 is annular and connected to the bottom of the transverse transport section 220. The crystallization section 230 surrounds the outer side of the longitudinal absorption section 210.

[0043] The longitudinal absorption section 210 is equipped with a longitudinal capillary tube, the transverse transport section 220 is equipped with a transverse capillary tube, and the crystallization section 230 is equipped with both longitudinal and transverse capillary tubes. All capillary tubes in the absorption member 200 are interconnected. Therefore, when the longitudinal absorption section 210 is inserted into the high-salt wastewater, the high-salt wastewater rises along the longitudinal capillary tubes in the longitudinal absorption section 210 under the action of capillary force and flows into the transverse transport section 220. Then, the high-salt wastewater flows through the transverse transport section 220 into the crystallization section 230, where the crystallization process is completed.

[0044] Specifically, the capillary pore size in the absorber 200 ranges from 5 μm to 120 μm. The thermal conductivity of the absorber 200 is lower than that of the salt solution being treated.

[0045] An evaporator plate 300 covers the top of the absorber 200 and is used to absorb solar energy and conduct heat energy to the absorber 200. After the heat is conducted to the absorber 200, the high-salt wastewater heats up and crystals precipitate in the crystallization section 230. Because the evaporator plate 300 is positioned on top of the absorber 200, the crystals generally precipitate on the side of the crystallization section 230, thus the precipitated crystals do not affect the normal operation of the evaporator plate 300, enabling long-term crystallization and recovery operations.

[0046] Furthermore, the evaporation plate 300 is made of polypyrrole-modified dust-free paper material. This material has the property of reducing the enthalpy of vaporization of water, promoting the evaporation of water at the top, and driving the liquid upward transport.

[0047] At the junction of the transverse transport section 220 and the crystallization section 230, the top temperature T1 is higher than the bottom temperature T2, and there is a temperature difference ΔT = T1 - T2 between the top and bottom of the side. The height of the side region is h, and the average temperature gradient is... The downward temperature-driven force overcomes the upward capillary force, allowing the high-concentration salt solution to transfer smoothly downwards. As heat is continuously conducted from the top to the bottom, the evaporation rate of water on the sides of the bottom region accelerates.

[0048] Furthermore, the transverse transport section 220 is cylindrical and the crystallization section 230 is annular, so that the high-salt wastewater absorbed from the longitudinal absorption section 210 can be radially and uniformly transferred to the transverse transport section 220 and finally uniformly enter the crystallization section 230, making the degree of crystallization in the circumferential direction of the crystallization section 230 similar.

[0049] Furthermore, in the absorber 200, the pore size of the longitudinally arranged capillary gradually decreases from bottom to top, thereby enhancing the capillary force at the upper end of the capillary and facilitating the smooth arrival of the high-salt wastewater in the transverse transport section 220.

[0050] Furthermore, in the absorbent 200, the transversely arranged capillary tube is connected to the small-diameter end of the longitudinally arranged capillary tube.

[0051] Furthermore, referring to Figure 3 and Figure 4 The porosity of the absorber 200 ranges from 60% to 80%, and the porous absorber 200 can absorb high-salt wastewater as much as possible.

[0052] Furthermore, a gap 240 is left between the longitudinal absorption section 210 and the crystallization section 230, and a locking block 110 is provided at the top opening of the liquid storage bottle 100. The locking block 110 is inserted into the gap 240 to realize the connection between the absorption member 200 and the liquid storage bottle 100.

[0053] Furthermore, the height of the absorber 200 is H, the diameter of the longitudinal absorber 210 is d, and the distance from the bottom of the crystallizing part 230 to the top of the transverse transport part 220 is h, wherein H:d = 9:1 to 45:1, and H:h = 3:2 to 9:1.

[0054] Furthermore, a gap 240 is left between the longitudinal absorption section 210 and the crystallization section 230, and the depth of the gap is l, wherein h:l = 3:1 to 12:1.

[0055] A crystallization recovery method according to a second aspect embodiment of this application, based on the above-mentioned crystallization recovery device for high-salinity wastewater, includes the following steps:

[0056] S100. Inject the high-salt wastewater to be recycled into the storage bottle 100;

[0057] S200. Insert the absorber 200 onto the storage bottle 100 so that the absorber 200 is immersed in the high-salt wastewater;

[0058] S300. The crystallization and recovery device for high-salt wastewater is placed under sunlight, and the evaporation plate 300 absorbs solar energy and converts it into heat energy;

[0059] S400. Under the action of capillary force, the high-salt wastewater rises along the longitudinal capillary of the longitudinal absorption section 210 and is transported to the crystallization section 230 through the transverse transport section 220.

[0060] S500. The heat energy of the evaporation plate 300 is conducted to the absorption element 200, and the high-salt wastewater is heated and crystallized in the crystallization section 230, and the crystals are precipitated from the crystallization section 230.

[0061] The above is a detailed description of the preferred embodiments of this application. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A crystallization recovery device for high-salinity wastewater, characterized in that, include: A storage bottle (100) for storing high-salt wastewater; The absorber (200) includes a longitudinal absorption section (210), a transverse transport section (220), and a crystallization section (230). One end of the longitudinal absorption section (210) is inserted into the storage bottle (100) and can contact the high-salt wastewater therein. The other end of the longitudinal absorption section (210) is connected to the center of the transverse transport section (220). The crystallization section (230) is annular and connected to the bottom of the transverse transport section (220). The crystallization section (230) surrounds the outer side of the longitudinal absorption section (210). The longitudinal absorption section (210) is provided with longitudinal capillaries, the transverse transport section (220) is provided with transverse capillaries, and the crystallization section (230) is provided with both longitudinal and transverse capillaries. The capillaries in the absorption member (200) are interconnected. High-salt wastewater rises along the longitudinal capillaries of the longitudinal absorption section based on capillary force, flows into the transverse transport section, and then flows into the crystallization section. An evaporating plate (300) covers the top of the absorber (200) and is used to absorb solar energy and conduct heat energy to the absorber (200). A gap (240) is left between the longitudinal absorption section (210) and the crystallization section (230). A locking block (110) is provided at the top opening of the liquid storage bottle (100). The locking block (110) is inserted into the gap (240) to realize the connection between the absorption member (200) and the liquid storage bottle (100).

2. The crystallization and recovery device for high-salinity wastewater according to claim 1, characterized in that: The transverse transport section (220) is cylindrical, and the crystallization section (230) is annular.

3. The crystallization and recovery device for high-salinity wastewater according to claim 1, characterized in that: The evaporation plate (300) is made of polypyrrole-modified dust-free paper material.

4. The crystallization and recovery device for high-salinity wastewater according to claim 1, characterized in that: In the absorber (200), the diameter of the capillary tubes arranged longitudinally gradually decreases from bottom to top.

5. The crystallization and recovery device for high-salinity wastewater according to claim 4, characterized in that: In the absorber (200), the transversely arranged capillary is connected to the small-diameter end of the longitudinally arranged capillary.

6. The crystallization and recovery device for high-salinity wastewater according to claim 1, characterized in that: The porosity of the absorber (200) ranges from 60% to 80%.

7. The crystallization and recovery apparatus for high-salinity wastewater according to any one of claims 1 to 6, characterized in that: The height of the absorber (200) is H, the diameter of the longitudinal absorber (210) is d, and the distance from the bottom of the crystallizing part (230) to the top of the transverse transport part (220) is h, wherein H:d = 9:1~45:1 and H:h = 3:2~9:

1.

8. The crystallization and recovery device for high-salinity wastewater according to claim 7, characterized in that: A gap (240) is left between the longitudinal absorption section (210) and the crystallization section (230), and the depth of the gap is l, wherein h:l=3:1~12:

1.

9. A crystallization recovery method, carried out using a crystallization recovery device for high-salinity wastewater as described in any one of claims 1 to 8, characterized in that, include: The high-salt wastewater to be recycled is injected into the storage bottle (100); The absorber (200) is inserted into the storage bottle (100) so that the absorber (200) is immersed in the high-salt wastewater; The crystallization and recovery device for the high-salt wastewater is placed under sunlight, and the evaporation plate (300) absorbs solar energy and converts it into heat energy; Under the action of capillary force, the high-salt wastewater rises along the longitudinal capillary of the longitudinal absorption section (210) and is transported to the crystallization section (230) through the transverse transport section (220). The heat energy of the evaporation plate (300) is conducted to the absorber (200), and the high-salt wastewater is heated and crystallized in the crystallization section (230), and crystals are precipitated from the crystallization section (230).

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