Wastewater treatment device

Abstract

The wastewater treatment device comprises a filtering assembly and a fluidized reactor, the filtering assembly comprises a main body part and a filtering part, a first cavity and a filtering cavity are formed in the main body part, the filtering part is arranged in the filtering cavity and used for filtering liquid flowing out of the first cavity, and the main body part is further provided with a crystal feeding opening and a first liquid outlet; the first liquid outlet is used for discharging filtered liquid, the fluidization reactor is located below the filtering assembly and connected with the main body part into a whole, a containing cavity is formed in the fluidization reactor and used for containing mixed reaction liquid, the mixed reaction liquid comprises waste water and a reactant, the containing cavity is communicated with the first cavity, and the second cavity is communicated with the second cavity. The mixed reaction liquid can enter the first cavity from the containing cavity, the mixed reaction liquid in the containing cavity can be subjected to a crystallization reaction on the surface of a seed crystal fed from the crystal feeding opening, and the wastewater treatment device integrates the filtering assembly and the fluidized reactor, so that the wastewater treatment device is compact in structure, and the occupied area of the device is saved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a wastewater treatment device. Background Art

[0002] Currently, the methods for wastewater treatment include mixing wastewater with a reactant to form a supersaturated solution, inducing the supersaturated solution to crystallize on the surface of seed crystals in a fluidized bed, and finally filtering the solution through a multi-media filter. However, since the fluidized bed and the multi-media filter are arranged at intervals and connected by pipelines, in this way, the multi-media filter requires additional land occupation, resulting in a large floor area of the wastewater treatment device. Summary of the Utility Model

[0003] An embodiment of the present application provides a wastewater treatment device, such that the filtering component does not require additional land occupation, reducing the floor area of the wastewater treatment device.

[0004] To achieve the above object, according to the first aspect of the present application, there is provided a wastewater treatment device, including:

[0005] A filtering component, including a main body part and a filtering part. The main body part forms a first chamber and a filtering chamber. The filtering part is arranged in the filtering chamber, and is used for filtering the liquid flowing out of the first chamber. The main body part is further provided with a seed crystal feeding port and a first liquid outlet. The seed crystal feeding port is arranged opposite to the first chamber, and the first liquid outlet is communicated with the filtering chamber, and is used for discharging the filtered liquid.

[0006] A fluidized bed reactor, located below the filtering component and integrally connected with the main body part. The fluidized bed reactor forms a cavity for accommodating a mixed reaction liquid, and the mixed reaction liquid includes wastewater and a reactant. The cavity is communicated with the first chamber, so that the mixed reaction liquid can enter the first chamber from the cavity. Among them, the mixed reaction liquid in the cavity can perform a crystallization reaction on the surface of the seed crystals fed from the seed crystal feeding port.

[0007] Optionally, the main body part includes:

[0008] An inner sleeve, the inner cavity of which forms the first chamber;

[0009] An outer sleeve, sleeved outside the inner sleeve and arranged at intervals with the inner sleeve. The upper end of the outer sleeve is higher than the upper end of the inner sleeve, and the filtering part is clamped between the inner sleeve and the outer sleeve.

[0010] An annular connecting part, which is connected to the lower end of the inner sleeve and the lower end of the outer sleeve, so that the inner sleeve, the outer sleeve and the annular connecting part jointly enclose to form the filtering cavity, and the first liquid outlet is arranged adjacent to the lower end of the outer sleeve or is arranged on the annular connecting part.

[0011] Optionally, the filtering assembly further includes a weir, which is connected to the upper end of the inner sleeve and extends along the circumferential direction of the inner sleeve.

[0012] Optionally, an annular groove is arranged on the side of the annular connecting part facing the inner sleeve. The inner side wall of the annular groove is connected to the lower end of the inner sleeve, and the outer side wall of the annular groove is connected to the lower end of the outer sleeve. The filtering part is arranged to cover the notch of the annular groove, and the first liquid outlet penetrates through the outer side wall of the annular groove.

[0013] Optionally, a backwashing inlet also penetrates through the outer side wall of the annular groove. The backwashing inlet is used to introduce liquid and flush the filtering part from bottom to top.

[0014] Optionally, the filtering part includes a filter plate, a gravel layer, a sand layer and a sand layer arranged in sequence from bottom to top. The periphery of the filter plate is connected to the inner side wall of the filtering cavity, and the filter plate is provided with a plurality of filter holes. The aperture of the filter holes is smaller than the particle size of the gravel in the gravel layer, and the particle size of the sand grains in the sand layer is larger than the particle size of the sand grains in the sand layer.

[0015] Optionally, the wastewater treatment device further includes a water distribution filter cap, and the water distribution filter cap is arranged in each of the filter holes.

[0016] Optionally, the fluidized bed reactor includes an upper shell and a lower shell connected in the up-down direction. The upper shell and the lower shell enclose to form the cavity, and the upper shell is adjacent to the filtering assembly;

[0017] The fluidized bed reactor further includes a filter cylinder, which is arranged in the lower shell. In the up-down direction, the diameter of the filter cylinder decreases. The end of the filter cylinder close to the filtering assembly abuts against the inner wall surface of the upper shell. The side wall of the filter cylinder is provided with a plurality of filter slits, and each filter slit extends in the up-down direction. The plurality of filter slits are arranged at intervals along the circumferential direction of the filter cylinder;

[0018] The lower shell is provided with a crystal discharge port, a second liquid inlet and a medicine inlet, all of which are communicated with the cavity. The crystal discharge port is at the bottom of the lower shell, and the lower port of the filter cylinder is communicated with the crystal discharge port. The second liquid inlet and the medicine inlet are arranged opposite to the side wall of the filter cylinder.

[0019] Optionally, the width K of the filter slot is 0.05 mm ≤ K ≤ 0.1 mm.

[0020] Optionally, the main body is further provided with a circulating water outlet connected to the first chamber;

[0021] The lower shell is also provided with a circulating water inlet, and the circulating water inlet and the circulating water outlet are connected through a first pipe.

[0022] Optionally, the wastewater treatment device further comprises a first valve body, which is arranged on the first pipeline and is used to open or block the first pipeline; and / or

[0023] The wastewater treatment device further comprises a circulation pump, and the circulation pump is installed on the first pipeline.

[0024] Optionally, the lower shell includes a shell body and a connecting pipe group, the upper end of the shell body is connected to the lower end of the upper shell, the lower end of the shell body is provided with a connecting port, the connecting pipe group includes a first pipe segment extending in the up and down directions and a second pipe segment connected to the side wall of the first pipe segment, the second pipe segment is extended radially along the first pipe segment, the upper end of the first pipe segment is connected to the connecting port, the lower end of the first pipe segment forms the crystal row port, and the end of the second pipe segment away from the first pipe segment forms the circulating water inlet.

[0025] Optionally, along the up-down direction, the cross-sectional area of ​​the upper shell is larger than the cross-sectional area of ​​the lower shell.

[0026] Optionally, from bottom to top, the cross-sectional area of ​​the upper shell is at least partially arranged to increase.

[0027] In the wastewater treatment device according to the embodiments of the present application, the mixed reaction liquid in the fluidized reactor undergoes a crystallization reaction on the surface of the seed crystal. In this way, it helps to further purify the wastewater, remove the dissolved pollutants therein, and enable the wastewater to meet higher discharge standards or reuse requirements. Since the cavity of the fluidized reactor is used to accommodate the mixed reaction liquid (wastewater and reactant), and through the connection with the first cavity, the mixed reaction liquid can smoothly enter the first cavity of the filtering component, and the mixed reaction liquid can continue to flow to the filtering cavity and be filtered by the filtering part. In this way, impurities such as suspended solids and particulate matters in the mixed reaction liquid can be removed, ensuring that the liquid discharged from the first liquid outlet is clear. The wastewater treatment device integrates the filtering component and the fluidized reactor, making the structure of the wastewater treatment device compact, saving the floor area of the equipment, and reducing the equipment investment cost to a certain extent. The interfaces such as the seed crystal feeding port and the first liquid outlet provided in the wastewater treatment device enable the operator to conveniently add the seed crystal and collect the treated liquid, reducing the operation difficulty and labor intensity. The solid waste (such as the seed crystal) generated by the crystallization reaction can be further processed or recycled, realizing the maximum utilization of resources and the minimum discharge of waste, which is in line with the concept of environmental friendliness and sustainable development.

[0028] Other features and advantages of the present application will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] In order to more comprehensively understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals in the following description represent the same parts.

[0031] Figure 1 is the overall structural schematic diagram of the wastewater treatment device provided in the exemplary embodiment of the present disclosure;

[0032] Figure 2 is Figure 1 the sectional schematic diagram of the wastewater treatment device shown;

[0033] Figure 3 is Figure 1 the sectional schematic diagram of the filtering component shown;

[0034] Figure 4 is the three-dimensional structural diagram of the filter cartridge provided in the exemplary embodiment of the present disclosure;

[0035] Figure 5 isFigure 4 Front view schematic diagram of the filter cartridge shown

[0036] Explanation of reference numerals in the drawings:

[0037] 10. Wastewater treatment device;

[0038] 1. Filter assembly, 11. Main body part, 111. First chamber, 112. Filter chamber, 113. Crystal injection port, 114. First liquid outlet, 115. Inner sleeve, 116. Outer sleeve, 1161. Filter media outlet, 1162. Filter media inlet, 1163. Backwash outlet, 117. Annular connection part, 1171. Annular groove, 1172. Backwash inlet, 118. Circulation water outlet, 119. Cover plate, 12. Filter part, 121. Filter plate, 122. Gravel layer, 123. Sand layer, 124. Sand layer, 13. Effluent weir;

[0039] 2. Fluidized bed reactor, 21. Upper shell, 211. Second liquid outlet, 22. Lower shell, 221. Crystal discharge port, 222. Second liquid inlet, 223. Chemical inlet, 224. Circulation water inlet, 225. Shell main body, 226. Connection pipe group, 2261. First pipe section, 2262. Second pipe section, 23. Filter cartridge, 231. Filter slit;

[0040] 3. Water distribution filter cap;

[0041] 201. Cavity;

[0042] 31. Electric valve. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0044] The present application provides a wastewater treatment device. Please refer to Figure 1 and Figure 2 , Figure 1 which is the structural schematic diagram of the wastewater treatment device provided by the embodiment of the present application, Figure 2 and Figure 1 is the cross-sectional schematic diagram of the wastewater treatment device shown.

[0045] The wastewater treatment device 10 includes a filtration component 1 and a fluidized-bed reactor 2. The filtration component 1 includes a main body part 11 and a filtration part 12. The main body part 11 forms a first cavity 111 and a filtration cavity 112. The filtration part 12 is arranged in the filtration cavity 112 and is used for filtering the liquid flowing out of the first cavity 111. The main body part 11 is also provided with a seeding port 113 and a first liquid outlet 114. The seeding port 113 is arranged opposite to the first cavity 111. In this way, the seeds introduced from the seeding port 113 can enter the first cavity 111. The first liquid outlet 114 is communicated with the filtration cavity 112. In this way, the filtered liquid can be discharged from the first liquid outlet 114.

[0046] The fluidized-bed reactor 2 is located below the filtration component 1 and is integrally connected to the main body part 11.

[0047] It should be noted that there are various ways to integrally connect the fluidized-bed reactor 2 and the main body part 11. For example, in one embodiment, the fluidized-bed reactor 2 and the main body part 11 can be integrally formed. In another embodiment, the fluidized-bed reactor 2 and the main body part 11 can also be welded together. In other embodiments, the fluidized-bed reactor 2 and the main body part 11 can also be plugged and matched and then fixed by fasteners. Specifically, the way to integrally connect the fluidized-bed reactor 2 and the main body part 11 can be selected according to needs, and the present application does not limit this.

[0048] The fluidized-bed reactor 2 forms a cavity 201, which is used for accommodating a mixed reaction liquid. The mixed reaction liquid includes wastewater and a reactant. The cavity 201 is communicated with the first cavity 111 so that the mixed reaction liquid can enter the first cavity 111 from the cavity 201. In this way, the mixed reaction liquid can continue to flow to the filtration cavity 112 to be filtered by the filtration part 12, greatly reducing the turbidity of the discharged liquid. The mixed reaction liquid in the cavity 201 can perform a crystallization reaction on the surface of the seeds introduced from the seeding port 113. In this way, the dissolved pollutants in the wastewater can be removed.

[0049] In the wastewater treatment device 10 according to the embodiments of the present application, the mixed reaction liquid in the fluidized reactor 2 undergoes a crystallization reaction on the surface of the seed crystal. In this way, it helps to further purify the wastewater, remove the soluble pollutants therein, and enable the wastewater to meet higher discharge standards or reuse requirements. Since the cavity 201 of the fluidized reactor 2 is used to accommodate the mixed reaction liquid (wastewater and reactant), and through the connection with the first cavity 111, the mixed reaction liquid can smoothly enter the first cavity 111 of the filtering component 1, and the mixed reaction liquid can continue to flow to the filtering cavity 112 to be filtered by the filtering part 12. In this way, impurities such as suspended solids and particulate matters in the mixed reaction liquid can be removed, ensuring that the liquid discharged from the first liquid outlet 114 is clear. The wastewater treatment device 10 integrally arranges the filtering component 1 and the fluidized reactor 2, making the wastewater treatment device 10 have a compact structure, saving the floor area of the equipment, and reducing the equipment investment cost to a certain extent. The interfaces such as the seed crystal feeding port 113 and the first liquid outlet 114 provided in the wastewater treatment device 10 enable the operator to conveniently add the seed crystal and collect the treated liquid, reducing the operation difficulty and labor intensity. The solid waste (such as the seed crystal) generated by the crystallization reaction can be further processed or recycled, realizing the maximum utilization of resources and the minimum discharge of waste, which conforms to the concept of environmental friendliness and sustainable development.

[0050] It should be noted that there are various types of wastewater. For example, the wastewater can include fluoride-containing wastewater, phosphorus-containing wastewater, heavy metal-containing wastewater, etc. In addition, the wastewater treatment device 10 can also be applied to the hardening and softening of wastewater. When the wastewater is fluoride-containing wastewater, the reactant can include sodium hydroxide and calcium chloride, and the seed crystal is quartz sand or calcium fluoride, and the particle size of the seed crystal is greater than 0.1 mm. When the wastewater contains at least one of Ni, Zn, Cu, Fe, Ag, Pb, and Hg, the reactant can include Na2CO3. The seed crystal can include at least one of sand, porous ceramsite, and cow bone. Taking the treatment of phosphorus-containing wastewater as an example, the crystallization reaction in the fluidized reactor 2 can adjust the pH of the mixed reaction liquid to be alkaline, so that phosphate ions crystallize and deposit on the surface of the seed crystal in the form of various insoluble substances.

[0051] Refer to Figure 2 and Figure 3 , Figure 3 is Figure 1Cross-sectional schematic view of the filter assembly shown. In some embodiments, the filter assembly 1 includes an inner sleeve 115, an outer sleeve 116, and an annular connecting portion 117. The inner cavity of the inner sleeve 115 forms a first chamber 111. The outer sleeve 116 is sleeved outside the inner sleeve 115 and is spaced from the inner sleeve 115. The upper end of the outer sleeve 116 is higher than the upper end of the inner sleeve 115. The filtering portion 12 is clamped between the inner sleeve 115 and the outer sleeve 116. In this way, while maintaining a compact volume, the entire filter assembly 1 can provide a larger filtering area, thereby improving the filtering efficiency. The annular connecting portion 117 is connected to the lower ends of the inner sleeve 115 and the outer sleeve 116, so that the inner sleeve 115, the outer sleeve 116, and the annular connecting portion 117 jointly enclose and form a filtering chamber 112. In this way, the filtering chamber 112 is annular. In this way, it can be realized that the first chamber 111 and the filtering chamber 112 are connected and do not interfere with each other, ensuring that the seeds introduced from the seeding port 113 can accurately fall into the first chamber 111, and the mixed reaction liquid flowing out of the first chamber 111 can automatically flow into the filtering chamber 112 under the action of gravity, which can improve the filtering efficiency and effect of the filtering portion 12 on the mixed reaction liquid. The existence of the annular connecting portion 117 not only enhances the overall structural strength of the filter assembly 1, but also helps to prevent fluid leakage and improves the safety of the equipment. The first liquid outlet 114 is arranged adjacent to the lower end of the outer sleeve 116 or is arranged on the annular connecting portion 117. In this way, it can be ensured that particles, suspended matters, etc. in the liquid discharged from the first liquid outlet 114 can be filtered by the filtering portion 12, thereby improving the clarity of the water discharged from the first liquid outlet 114.

[0052] Referring to Figure 2 , in some embodiments, the main body portion 11 further includes a cover plate 119. The cover plate 119 covers the upper port of the outer sleeve 116. The cover plate 119 is provided with a seeding port 113. The existence of the cover plate 119 effectively prevents foreign substances from the outside (such as dust or sundries, etc.) from entering the inside of the first chamber 111 and the filtering chamber 112, ensuring the cleanliness and normal operation of the filter assembly 1. The design of the seeding port 113 enables the operator to conveniently add seeds into the first chamber 111 without opening the entire cover plate 119 or performing complex operations. This design simplifies the process of adding seeds, reduces the operation time, and improves the work efficiency. The tight fit between the cover plate 119 and the outer sleeve 116 enhances the sealing performance of the filter assembly 1, prevents liquid leakage, and ensures the filtering effect and wastewater treatment efficiency. The cover plate 119 plays a protective role for internal components such as the filtering portion 12, preventing damage caused by external factors.

[0053] Continuing to refer to Figure 2, in some embodiments, the filtering component 1 further includes an effluent weir 13. The effluent weir 13 is connected to the upper end of the inner sleeve 115 and extends circumferentially along the inner sleeve 115. The effluent weir 13 extending circumferentially along the inner sleeve 115 can ensure that the liquid flowing from the first chamber 111 to the filtering chamber 112 is evenly distributed on the entire upper peripheral edge of the inner sleeve 115. This uniform distribution helps to reduce the congestion and turbulence of the water flow, improve the efficiency of the liquid flowing to the filtering chamber 112, enable the liquid to flow evenly to the filtering chamber 112, and improve the filtering effect on the liquid. In addition, the setting of the effluent weir 13 can also prevent the seeds introduced from the seeding port 113 from moving to the filtering chamber 112. The design of the effluent weir 13 can reduce the possibility of unfiltered impurities or suspended substances escaping with the effluent, and ensure that the water quality discharged from the first liquid outlet 114 meets the requirements.

[0054] It should be noted that the effluent weir 13 includes a triangular weir, a trapezoidal weir, a rectangular weir, etc. In the embodiments of the present application, the effluent weir 13 of the present application is selected as a triangular weir. In this way, the structure of the triangular weir is relatively simple and does not require complex processing techniques and equipment, so the manufacturing cost is relatively low. Due to its simple structure, the triangular weir is also more convenient to maintain. The design of the triangular weir makes its measurement stability better and is not easily affected by external factors such as water flow fluctuations, thus ensuring the stability of the water output.

[0055] Refer to Figure 2 , in some embodiments, a circular groove 1171 is provided on the side of the annular connecting portion 117 facing the inner sleeve 115. The inner side wall of the circular groove 1171 is connected to the lower end of the inner sleeve 115, and the outer side wall of the circular groove 1171 is connected to the lower end of the outer sleeve 116. The filtering portion 12 is arranged to cover the notch of the circular groove 1171. In this way, this design makes the installation of the filtering portion 12 simple and fast. Just placing it on the circular groove 1171 can achieve preliminary fixation. This method enables the filtering portion 12 to be firmly held in a predetermined position during the filtering process and is not easily loosened or detached. When the filtering portion 12 needs to be replaced or cleaned, since it is arranged to cover the notch of the circular groove 1171, it can be taken out and replaced relatively conveniently, reducing the complexity and time cost of the maintenance work. The outer side wall of the circular groove 1171 is provided with a first liquid outlet 114 in a penetrating manner. In this way, it is realized that the filtered liquid can be discharged from the first liquid outlet 114 as much as possible, and the structure is simple and easy to process.

[0056] In some embodiments, a backwash inlet 1172 is also provided through the outer sidewall of the annular groove 1171. The backwash inlet 1172 is used to introduce liquid and flush the filter part 12 from bottom to top. This flushing method can more effectively strip the impurities and particulate matters attached to the surface of the filter part 12. Since the flushing liquid enters from the bottom, it can directly impact the bottom and side surfaces of the filter part 12, reducing the flushing dead angles and improving the flushing efficiency. The bottom-up flushing can ensure that all parts of the filter part 12 are thoroughly cleaned, avoiding the problem of incomplete local cleaning, thereby extending the service life of the filter part 12. The setting of the backwash inlet 1172 makes the cleaning of the filter part 12 more convenient and fast.

[0057] Referring to Figure 2 and Figure 3 , in some embodiments, a backwash outlet 1163 is also provided on the sidewall of the outer sleeve 116. The backwash outlet 1163 is located above the filter part 12. In this way, when the backwashing of the filter part 12 is completed, the liquid conveyed from the backwash inlet 1172 can also be directly and quickly discharged from the backwash outlet 1163, avoiding the retention of the backwash liquid in the filter chamber and ensuring that the filtering effect is not affected. In addition, discharging the backwash liquid in time can prevent the impurities or pollutants generated during the cleaning process from redepositing on the filter part 12 and affecting the filtering effect.

[0058] Continuing to refer to Figure 2 , in some embodiments, the filter part 12 includes a filter plate 121, a gravel layer 122, a sand layer 123, and a sand layer 124 arranged in sequence from bottom to top. The periphery of the filter plate 121 is connected to the inner sidewall of the filter chamber 112, and the filter plate 121 is provided with a plurality of filter holes. The aperture of the filter holes is smaller than the particle size of the gravel. In this way, the filter plate 121 can allow the liquid to pass through while blocking the gravel from falling through the filter holes, which can improve the filtering accuracy of the filter part 12 to a certain extent. The particle size of the sand grains in the sand layer 123 is larger than that of the sand grains in the sand layer 124. In this way, when the liquid flows through the sand layer 124, the sand layer 123, the gravel layer 122, and the filter plate 121 in sequence, multi-stage filtration of the liquid is achieved, thereby significantly reducing the turbidity of the liquid discharged from the first liquid outlet 114. Since the sand layer 124, the sand layer 123, the gravel layer 122, and the filter plate 121 all undertake part of the filtering task, the possibility of any one layer alone undertaking all the filtering pressure is reduced, thereby reducing the risk of blockage.

[0059] Referring to Figure 2, in some embodiments, the wastewater treatment device 10 further includes water distribution filter caps 3. Each water distribution filter cap 3 is disposed within each filtration hole. In this way, the filtered liquid can flow orderly through the multiple water distribution filter caps 3 to the first drain outlet, avoiding the disorderly diffusion and chaos of the water flow on the filter plate 121. This orderly flow helps reduce the impact and abrasion of the water flow on the filter plate 121, while improving the collection efficiency of the wastewater. Each filtration hole is equipped with a water distribution filter cap 3, ensuring that the filtered liquid can flow out evenly through each filtration hole, reducing dead corners and sludge accumulation areas caused by uneven water flow distribution. Since the wastewater flows out continuously through the multiple water distribution filter caps 3, the filtration process can continue without being affected by water flow stagnation, which helps maintain the stable working state of the filtration unit 12 and improves the continuity and efficiency of wastewater treatment. The design of the water distribution filter cap 3 helps prevent the filtration holes from being blocked. When the filtered liquid flows out through the water distribution filter cap 3, its internal microstructures can intercept some suspended solids and impurities, thus reducing the clogging pressure on the filtration holes. The installation and disassembly of the water distribution filter cap 3 are relatively convenient. When cleaning or replacement is required, it can be easily taken out for cleaning or replacement. The water distribution filter cap 3 can further intercept the tiny suspended solids and impurities in the wastewater, ensuring the clarity and transparency of the effluent quality.

[0060] Refer to Figure 1 and Figure 2 , in some embodiments, a filter media outlet 1161 is further provided at one end of the outer sleeve 116 adjacent to the annular connection portion 117. The filter media outlet 1161 is used for discharging gravel and / or sand out of the filtration chamber 112. In this way, the filter media (gravel and sand) may lose its filtration effect after long-term use due to abrasion or contamination. Providing the filter media outlet 1161 can conveniently discharge the abraded or contaminated gravel and sand without disassembling the entire filtration device, thus shortening the time for replacing the filter media and reducing the maintenance cost. After discharging the filter media through the filter media outlet 1161, it is convenient to inspect and clean the interior of the filtration chamber 112, keeping the filtration device clean and unobstructed, and improving its filtration efficiency and service life.

[0061] Refer to again Figure 1 and Figure 2, in some embodiments, a filter media inlet 1162 is further provided at one end of the outer sleeve 116 away from the annular connection portion 117. The filter media inlet 1162 is used for adding gravel and / or sand grains into the filtration chamber 112. In this way, through the filter media inlet 1162, an operator can directly add new filter media such as gravel and sand grains into the filtration chamber 112 without disassembling or moving other components, simplifying the process of adding filter media. Directly adding filter media can shorten the operation time, improve the maintenance efficiency, and ensure the continuous and efficient operation of the wastewater treatment device 10. According to different wastewater treatment requirements, the combination of the type, particle size, and number of layers of the filter media can be flexibly adjusted through the filter media inlet 1162 to achieve the best filtration effect. As the wastewater treatment progresses, the filter media will gradually be contaminated, blocked, or worn. Regularly replenishing new filter media through the filter media inlet 1162 can keep the amount of filter media in the filtration chamber 112 sufficient and extend the service life of the equipment.

[0062] Refer to Figure 2 , Figure 4 and Figure 5 , Figure 4 is a three-dimensional structural diagram of the filter cartridge provided in an exemplary embodiment of the present disclosure. Figure 5 is Figure 4Front view schematic diagram of the filter cartridge shown. In some embodiments, the fluidized reactor 2 includes an upper housing 21 and a lower housing 22 connected in the up-down direction. The upper housing 21 and the lower housing 22 enclose a cavity 201. The upper housing 21 is adjacent to the filter assembly 1. The fluidized reactor 2 further includes a filter cartridge 23 disposed in the lower housing 22. In the up-down direction, the diameter of the filter cartridge 23 decreases. The end of the filter cartridge 23 close to the filter assembly 1 abuts against the inner wall surface of the upper housing 21. A plurality of filter slits 231 are provided on the side wall of the filter cartridge 23. Each filter slit 231 extends in the up-down direction. The plurality of filter slits 231 are spaced along the circumferential direction of the filter cartridge 23. The lower housing 22 is provided with a crystal discharge port 221, a second liquid inlet 222, and a medicine inlet 223 that are all communicated with the cavity 201. The crystal discharge port 221 is at the bottom of the lower housing 22. The lower port of the filter cartridge 23 is communicated with the crystal discharge port 221. The second liquid inlet 222 and the medicine inlet 223 are disposed opposite to the side wall of the filter cartridge 23. Thus, when the wastewater enters the cavity 201 from the second liquid inlet 222 and the reactant enters the cavity 201 from the medicine inlet 223, the wastewater and the reactant collide with the filter cartridge 23 and immediately disperse in all directions to form a mixed flow, so that the wastewater and the reactant are fully contacted to form a supersaturated solution, and then enter the interior of the filter cartridge 23 from different filter slits 231 on the filter cartridge 23, achieving the purpose of more sufficient water distribution. The supersaturated solution enters the interior of the filter cartridge 23 through the filter slits 231 of the filter cartridge 23 and continues to flow upward. The supersaturated solution contacts the crystal seeds introduced from the crystal feeding port 113, and crystals are formed on the crystal seeds through the induced crystallization effect. The supersaturated solution can lift the crystal seeds staying on the gaps of the filter cartridge 23, preventing the crystal seeds from staying on the filter cartridge 23 for a long time. The crystal seeds quickly react through induced crystallization during the continuous lifting and settling process and continuously grow into coarse crystals. After a period of time, the particle size of the crystal seeds continuously grows. The coarse particle crystal seeds settle on the filter cartridge 23. The mixed reaction liquid after the reaction continues to rise into the upper housing 21 and continues to flow, thus sequentially passing through the first chamber 111 and the filter chamber 112. The wastewater is filtered by the filter part 12 and discharged from the first discharge port. When the crystal seeds grow to a certain particle size, the crystal seeds will slide along the inner side wall of the filter cartridge 23 and gather at the lower port of the filter cartridge 23. Since the lower port of the filter cartridge 23 is communicated with the crystal discharge port 221, the crystal seeds that grow to a certain particle size can be discharged from the crystal discharge port 221.

[0063] It should be noted that the number of the medicine inlets 223 can be set to one, or can be set to two, three or even more. Specifically, the number of the medicine inlets 223 can be set according to actual needs. The present application does not limit the number of the medicine inlets 223.

[0064] In some embodiments, the width K of the filtering slit 231 satisfies 0.05 mm ≤ K ≤ 0.1 mm. In this width range, the supersaturated solution can pass through the filtering slit 231, and at the same time, it can ensure that the crystal seeds are discharged from the crystal discharging port 221 and prevent the crystal seeds from falling through the filtering slit. In addition, when the width of the filtering slit 231 is in the range of 0.05 mm to 0.1 mm, the risk of reduced filtering efficiency caused by impurity blockage of the filtering slit 231 can be reduced.

[0065] Referring to Figure 2 , in some embodiments, the main body portion 11 is further provided with a circulating water outlet 118 communicating with the first chamber 111, and the lower housing 22 is further provided with a circulating water inlet 224. The circulating water inlet 224 and the circulating water outlet 118 are connected through a first pipeline. In this way, through the arrangement of the circulating water outlet 118 and the circulating water inlet 224, the recycling of wastewater is realized. During the wastewater treatment process, the water that has undergone the crystallization reaction can be discharged through the circulating water outlet 118 and then re-enter the cavity 201 through the circulating water inlet 224 to continue the crystallization reaction, improving the efficiency of treating pollutants in the wastewater. The circulating water system can ensure a certain flow rate and velocity of the wastewater during the treatment process, which is beneficial to the continuous progress of the crystallization reaction during the treatment process. Through the circulating treatment, the pollutants in the wastewater can be removed more thoroughly, improving the water quality of the effluent. The circulating water system can also reduce the water quality fluctuation during the wastewater treatment process. Since the wastewater is continuously treated in a cycle, the problem of unstable treatment effect caused by intermittent discharge of wastewater can be avoided.

[0066] In some embodiments, the wastewater treatment device 10 further includes a first valve body disposed in the first pipeline for conducting or blocking the first pipeline. In this way, the presence of the first valve body enables the operator to precisely control the flow state of the fluid in the first pipeline. When needed, the valve can be quickly opened to conduct the first pipeline, allowing the wastewater to circulate smoothly; when not needed, the valve can be timely closed to block the first pipeline, preventing unnecessary flow or leakage of the fluid. During the wastewater treatment process, various emergencies (such as equipment failures, water quality mutations, etc.) may occur. At this time, by quickly adjusting the opening and closing state of the first valve body, the on-off of the first pipeline can be quickly cut off or restored to cope with emergencies and ensure the smooth progress of the wastewater treatment process.

[0067] In some embodiments, the wastewater treatment device 10 further includes a circulating pump installed in the first pipeline. In this way, the circulating pump installed on the first pipeline can directly act on the circulating water flow, increasing the circulation speed and flow rate of the water flow, thereby enhancing the circulation effect of the wastewater in the treatment device. Through the arrangement of the circulating pump, the speed of the circulating water flow can be adjusted as needed, so as to ensure that the crystal seeds in the cavity 201 are always in a fluidized state, improving the efficiency of removing pollutants in the wastewater.

[0068] It should be noted that the state in which the seed crystal is continuously lifted upward and then falls downward under the action of the upward buoyancy of the mixed reaction liquid and its own gravity in the cavity 201 is called the fluidized state.

[0069] In some embodiments, a second liquid outlet 211 communicating with the cavity 201 is formed at the upper end of the upper housing 21, and the second liquid outlet 211 communicates with the first cavity 111. In this way, the liquid in the cavity 201 can flow to the first cavity 111 through the second liquid outlet 211.

[0070] In some embodiments, the lower housing 22 includes a housing main body 225 and a connecting pipe group 226. The upper end of the housing main body 225 communicates with the lower end of the upper housing 21. A connection port is provided at the lower end of the housing main body 225. The connecting pipe group 226 includes a first pipe section 2261 extending in the vertical direction and a second pipe section 2262 communicating with the side wall of the first pipe section 2261. The second pipe section 2262 extends radially along the first pipe section 2261. The upper end of the first pipe section 2261 is connected to the connection port, the lower end of the first pipe section 2261 forms a crystal discharge port 221, and the end of the second pipe section 2262 facing away from the first pipe section 2261 forms a circulating water inlet 224. In this way, the orientation of the crystal discharge port 221 is consistent with the sedimentation direction of the mature crystal under the action of gravity, so that the mature crystals in the cavity 201 can be smoothly discharged. The structure is simple and easy to process. In addition, the orientation of the circulating water inlet is exactly opposite to the natural sedimentation direction of the seed crystal, which is beneficial to the continuous sedimentation and being lifted of the seed crystal, increasing the movement path of the seed crystal, thereby prolonging the contact time and increasing the contact area between the mixed reaction liquid and the seed crystal, which is beneficial to the rapid growth of the seed crystal.

[0071] In some embodiments, electric valves 31 are provided at one end of the first pipe section 2261 adjacent to the connection port, one end of the first pipe section 2261 adjacent to the crystal discharge port 221, and the second pipe section 2262. In this way, the electric valves 31 can be quickly and accurately opened or closed, so as to achieve precise control of the flow of the mixed reaction liquid in the first pipe section 2261 and the second pipe section 2262. Compared with manual valves, the electric valves 31 can be integrated with an automatic control system to achieve remote or automatic operation. This reduces the need for manual intervention and improves the automation level and operating efficiency of the wastewater treatment device 10. In case of an emergency, the electric valves 31 can be quickly closed to cut off the fluid supply and prevent accidental safety. By adjusting the opening degree of the electric valves 31, the flow rate and velocity of the mixed reaction liquid can be controlled, so as to optimize the crystallization reaction and improve the wastewater treatment effect.

[0072] Refer to Figure 1 and Figure 2, in some embodiments, along the vertical direction, the cross-sectional area of the upper housing 21 is larger than that of the lower housing 22. In this way, the cross-sectional area of the water flow in the upper housing 21 is larger than that in the lower housing 22. According to the principle of fluid mechanics, the flow velocity will decrease as the cross-sectional area increases. Therefore, the water flow velocity in the upper housing 21 is slower. As a result, the seed crystal may be pushed upward by the water flow in the lower housing 22, but in the upper housing 21, due to the too small water flow velocity, it does not reach the minimum fluidization velocity of the crystal. Therefore, the crystal cannot continue to rise in the upper housing 21, so that when the seed crystal grows to a certain size, it will spontaneously sink on the side wall of the filter cartridge 23.

[0073] In some embodiments, in the direction from bottom to top, the cross-sectional area of the upper housing 21 is at least partially incrementally arranged. In this way, the compressive capacity of the upper housing 21 is enhanced. The incremental arrangement of the cross-sectional area of the upper housing 21 can affect the water flow velocity. At the same flow rate, the increase in the cross-sectional area means a decrease in the water flow velocity, which helps to achieve a more uniform water flow distribution and a longer residence time, thereby ensuring that the crystal does not continue to rise in the upper housing 21. The design of the incrementally increasing cross-sectional area of the upper housing 21 makes the fluid flow more smoothly. In applications involving crystal growth and deposition, since the water flow velocity in the upper housing 21 is slower and the cross-sectional area is larger, the crystal is not easily washed up by the water flow and deposits on the side wall. In this way, it helps to reduce the deposition of the crystal on the inner wall of the upper housing 21.

[0074] The following takes the wastewater treatment device 10 as an example to illustrate the treatment of fluoride-containing wastewater:

[0075] The seed crystal is quartz sand or calcium fluoride, and the particle size of the seed crystal is greater than 0.1 mm. The fluoride-containing wastewater enters the lower housing 22 through the second liquid inlet 222. At the same time, the calcium chloride solution and the sodium hydroxide solution enter the lower housing 22 through the chemical inlet 223. The wastewater, calcium chloride solution and sodium hydroxide solution collide with the filter cylinder 23 and immediately disperse in all directions to form a mixed flow, so that the wastewater, calcium chloride solution and sodium hydroxide solution are fully contacted to form a supersaturated calcium fluoride solution. The supersaturated calcium fluoride solution enters the filter cylinder 23 through the filter slots 231 of the filter cylinder 23, contacts with the quartz sand seed crystal input from the seed crystal inlet 113, and heterogeneously crystallizes on the quartz sand seed crystal to generate calcium fluoride crystals through induced crystallization. Since the stacking direction of the calcium fluoride crystals on the filter grid is at an acute angle to the filter slots 231, it is difficult for the calcium fluoride crystals to stack statically on the inner side wall of the filter cylinder 23. In this way, the phenomenon of scaling on the inner side wall of the filter cylinder 23 caused by long-term use can be avoided. At the same time, since the cross section of the bottom of the filter cylinder 23 is smaller than that of the top, the water flow velocity at the bottom of the filter cylinder 23 is relatively large and gradually slows down at the top, which is beneficial to realize the fluidization and expansion of the seed crystal. In addition, the supersaturated calcium fluoride solution lifts the seed crystal staying on the gap of the filter cylinder 23, preventing the seed crystal from staying in the filter cylinder 23 for a long time. The seed crystal grows into coarse crystals rapidly through induced crystallization during the continuous lifting and settling process; after a period of time, the particle size of the seed crystal grows continuously, and the coarse particle seed crystal settles on the filter cylinder 23; the fluoride-containing wastewater after reaction continues to rise and enters the upper housing 21. Most of the fluoride-containing wastewater after reaction passes through the circulating water outlet 118, and then is transported back to the lower port of the filter cylinder 23 through the circulating pump and the circulating water inlet, driving the seed crystal and immature coarse crystals deposited on the filter cylinder 23 to the upper end of the filter cylinder 23 for fluidized crystallization. When the crystal grows to a certain particle size, the crystal with a certain particle size will slide along the inner side wall of the filter cylinder 23 and converge to the lower port of the filter cylinder 23, and then is discharged through the discharge port 221 through the first pipe section 2261. A small part of the fluoride-containing wastewater after reaction flows into the filter chamber 112 by gravity through the weir 13. A small part of the fluoride-containing wastewater after reaction passes through the filtering part 12 composed of a sand layer 124, a sand layer 123, a gravel layer 122 and a filter plate 121 in turn under the action of gravity. In this way, the fine calcium fluoride crystals and other suspended substances in the wastewater can be intercepted by the filtering part 12. The water discharged after the filtering part 12 filters passes through the water distribution filter cap 3 and enters the annular groove 1171, and is discharged through the first liquid outlet 114, so as to obtain clarified effluent. As the interception of the filtering part 12 increases and the filtering effect of the filtering part 12 decreases significantly, the filtering will be stopped, and liquid is introduced through the backwashing inlet 1172 and the liquid is used to wash the filtering part 12 from bottom to top. In this way, the filtering part 12 is backwashed, and the fine calcium fluoride crystals on the filtering part 12 enter the cavity 201 through the weir 13 and continue to be used as seed crystals for reuse.Since the crystal discharging port 221 and the circulating water inlet are located below the exact center of the filter cartridge 23, the functions of crystal discharging and circulating water inlet are realized by switching the electric valve. The direction of the crystal discharging port 221 is consistent with the sedimentation direction of the mature crystals under the action of gravity, achieving the purpose of smooth crystal discharging. In addition, the circulating water inlet is directly opposite to the natural sedimentation direction of the crystal seeds, which is conducive to the continuous sedimentation and being lifted of the crystal seeds, increasing the movement path of the crystal seeds, thereby prolonging the contact time between the wastewater and the crystal seeds and increasing the contact area, which is beneficial to the rapid growth of the crystal seeds.

[0076] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0077] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0078] Among the embodiments, implementation manners and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0079] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A wastewater treatment device, characterized in that, Comprising: A filtering component, including a main body part and a filtering part. The main body part is formed with a first chamber and a filtering chamber. The filtering part is arranged in the filtering chamber and is used for filtering the liquid flowing out of the first chamber. The main body part is further provided with a crystal seeding port and a first liquid outlet. The crystal seeding port is arranged opposite to the first chamber, and the first liquid outlet is communicated with the filtering chamber and is used for discharging the filtered liquid. A fluidized reactor, located below the filtering component and integrally connected to the main body part. The fluidized reactor is formed with a cavity for accommodating a mixed reaction liquid. The mixed reaction liquid includes wastewater and a reactant. The cavity is communicated with the first chamber so that the mixed reaction liquid can enter the first chamber from the cavity. Among them, the mixed reaction liquid in the cavity can perform a crystallization reaction on the surface of the crystal seeds input from the crystal seeding port.

2. The wastewater treatment device according to claim 1, characterized in that, The main body part includes: An inner sleeve, the inner cavity of which forms the first chamber. An outer sleeve, sleeved outside the inner sleeve and spaced from the inner sleeve. The upper end of the outer sleeve is higher than the upper end of the inner sleeve, and the filtering part is clamped between the inner sleeve and the outer sleeve. An annular connecting part, connected to the lower ends of the inner sleeve and the outer sleeve, so that the inner sleeve, the outer sleeve and the annular connecting part jointly enclose to form the filtering chamber. The first liquid outlet is arranged adjacent to the lower end of the outer sleeve or is arranged on the annular connecting part.

3. The wastewater treatment device according to claim 2, wherein The filtering component further includes a water outlet weir, which is connected to the upper end of the inner sleeve and extends circumferentially along the inner sleeve.

4. The wastewater treatment device according to claim 2, characterized in that, An annular groove is arranged on the side of the annular connecting part facing the inner sleeve. The inner side wall of the annular groove is connected to the lower end of the inner sleeve, and the outer side wall of the annular groove is connected to the lower end of the outer sleeve. The filtering part is arranged to cover the notch of the annular groove, and the first liquid outlet penetrates through the outer side wall of the annular groove.

5. The wastewater treatment device according to claim 4, characterized in that The outer side wall of the annular groove also penetrates through an anti-flushing inlet, which is used for introducing liquid and flushing the filtering part from bottom to top.

6. The wastewater treatment device according to any one of claims 1 to 5, characterized in that, The filtering part includes a filtering plate, a gravel layer, a sand layer and a sand layer arranged in sequence from bottom to top. The periphery of the filtering plate is connected to the inner side wall of the filtering chamber, and the filtering plate is provided with a plurality of filtering holes. The aperture of the filtering holes is smaller than the particle size of the gravel in the gravel layer, and the particle size of the sand grains in the sand layer is larger than the particle size of the sand grains in the sand layer.

7. The wastewater treatment device according to claim 6, characterized in that, The wastewater treatment device further includes a water distribution filter cap, and each filtering hole is provided with the water distribution filter cap.

8. The wastewater treatment device according to any one of claims 1 to 5, characterized in that, The fluidized reactor includes an upper shell and a lower shell connected in the up-down direction. The upper shell and the lower shell enclose to form the cavity, and the upper shell is adjacent to the filtering component. The fluidized reactor further comprises a filter cartridge, which is arranged in the lower shell body, and the diameter of the filter cartridge is arranged to decrease from top to bottom, and the end of the filter cartridge close to the filter assembly abuts against the inner wall surface of the upper shell body, and the side wall of the filter cartridge is provided with a plurality of filter slots, each of which is extended in the up-down direction, and the plurality of filter slots are arranged at intervals along the circumference of the filter cartridge; The lower shell is provided with a crystal row port, a second liquid inlet and a drug inlet, all of which are connected to the cavity. The crystal row port is located at the bottom of the lower shell, and the lower port of the filter cartridge is connected to the crystal row port. The second liquid inlet and the drug inlet are arranged opposite to the side wall of the filter cartridge.

9. The wastewater treatment device according to claim 8, characterized in that, The width K of the filter slot is 0.05 mm ≤ K ≤ 0.1 mm.

10. The wastewater treatment device according to claim 8, characterized in that, The main body is also provided with a circulating water outlet connected to the first chamber; The lower shell is also provided with a circulating water inlet, and the circulating water inlet and the circulating water outlet are connected through a first pipe.

11. The wastewater treatment device according to claim 10, characterized in that, The wastewater treatment device further comprises a first valve body, which is arranged on the first pipeline and is used to open or block the first pipeline; and / or The wastewater treatment device further comprises a circulation pump, and the circulation pump is installed on the first pipeline.

12. The wastewater treatment device according to claim 10, characterized in that, The lower shell body includes a shell body and a connecting pipe group, the upper end of the shell body is connected with the lower end of the upper shell body, the lower end of the shell body is provided with a connecting port, the connecting pipe group includes a first pipe segment extending in the up-down direction and a second pipe segment connected with the side wall of the first pipe segment, the second pipe segment is extended radially along the first pipe segment, the upper end of the first pipe segment is connected with the connecting port, the lower end of the first pipe segment forms the crystal row port, and the end of the second pipe segment away from the first pipe segment forms the circulating water inlet.

13. The wastewater treatment device according to claim 8, characterized in that, Along the up-down direction, the cross-sectional area of ​​the upper shell is greater than the cross-sectional area of ​​the lower shell.

14. The wastewater treatment device according to claim 13, characterized in that, From bottom to top, the cross-sectional area of ​​the upper shell is at least partially arranged to increase.

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