A semi-continuous contact freezing type sewage / wastewater separation and treatment device

Abstract

The application discloses a kind of semi-continuous contact frozen type sewage / wastewater separation treatment device, the operation of device mainly through "precooling", "freezing", "ice" three processes realizes the treatment of wastewater, first using cold bed, water purification spray pipe, liftable sealing cover, to the contact piece on track is carried out "precooling" process, subsequently contact piece enters freezing box and is carried out "freezing" process, finally reaches heat transfer bed, carries out "ice" process, and the ice block that melts falls storage utilization.Can realize the semi-continuous efficient separation treatment of sewage wastewater.The device is highly integrated, simple and reliable, flexible operation, strong continuous processing capacity, low equipment operation cost, cold source separation, when environmental temperature is appropriate, can replace compressor unit, further reduce energy consumption.The ice produced can participate in the recycling of energy, and can be sold to cold chain and cold storage.

Description

Technical Field

[0001] This invention belongs to the field of cryogenic separation technology, and in particular relates to a semi-continuous contact cryogenic wastewater separation and treatment device. Background Technology

[0002] Water is an indispensable resource for the survival and development of human society. China is a country with a severe water shortage, therefore, water treatment should strive to achieve green and efficient processes. In recent years, with the development of urbanization and industrialization, the types of water pollution have gradually increased, and the volume of sewage and wastewater has also gradually increased, making water treatment increasingly difficult.

[0003] Freezing separation, as an effective water treatment method, utilizes the principle that water molecules, compared to other substances, more easily undergo phase change and condense into ice in a gradually decreasing temperature freezing environment. During the crystallization process of molecular rearrangement, water molecules repel foreign impurities, forming pure ice and a concentrated solution. Its advantages include obtaining relatively pure ice through a physical phase change process, concentrating wastewater volume, eliminating the need for chemical additives, simplifying the operation process, maintaining a consistently high level of process effectiveness, and providing ice with various applications.

[0004] Compared to other methods such as suspension crystallization freezing, the advantages of progressive freezing are more reflected in the fact that the ice formed by this method is a single layered crystal, the freezing process is more controllable, the solid-liquid separation is easier, and the required equipment is relatively simple and inexpensive.

[0005] For the construction of refrigeration units, ice-water separation, efficient energy utilization, and effective refrigeration treatment have always been key issues. Current designs are mostly intermittent processes, and some units are prone to energy loss. For example, a wastewater treatment method and system (CN109110853A) proposes a combination of refrigeration and evaporation methods. While utilizing the waste heat generated by the equipment, it directly heats the low-temperature wastewater, resulting in ineffective utilization of low-temperature energy and increasing equipment operating costs. Another example is a continuous refrigeration crystallization separation system for wastewater (CN205387483 U), which includes a separate ice crystal washing device. This increases equipment setup and operating costs, and reintroduces some ice crystals into the crystallization tank, potentially causing water quality instability. Furthermore, it has specific requirements for the operating environment temperature and washing water temperature, which can affect ice removal efficiency. In addition, current approaches often involve overall cold-heat changes in the continuity of each process stage, further wasting energy and reducing the processing rate. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a semi-continuous contact freezing type sewage / wastewater separation and treatment device. The freezing separation method and energy utilization have been redesigned, and a more reasonable semi-continuous ice-water separation device has been constructed while making full use of residual cooling, which can treat wastewater in a green and efficient manner.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a semi-continuous contact freezing type sewage / wastewater separation and treatment device, wherein a storage refrigerator is provided on one side of the bottom of the inner shell and a buffer slope is provided on the other side facing the storage refrigerator. The lower half of the buffer slope is located in the storage refrigerator. The freezing box is set on the top surface of the storage refrigerator on the side away from the buffer slope. A flip-up plate for dust prevention and heat preservation is provided between the storage refrigerator and the buffer slope to seal the top of the storage refrigerator. The flip-up plate can guide the ice blocks falling from the top into the storage refrigerator. A concentrated wastewater outlet communicating with the freezing box and an ice water outlet communicating with the storage refrigerator are provided on the outer side of the outer shell on the side opposite to the buffer slope. An external water inlet precooling pipe communicates with the freezing box through the buffer slope and the inside of the storage refrigerator.

[0008] A track is installed directly above the freezer box inside the outer shell. The track is constrained by three rotating rollers and divided into three parts. One part is parallel to the freezer box and adjacent to its top. Contact plates are equidistantly arranged on the outer side of the track. The contact plates can be immersed into the freezer box for a certain length and can be removed from the freezer box when a certain amount of ice is attached. Two cooling beds and one heat transfer bed are arranged in the triangular space enclosed by the track. The second cooling bed is located on the inner side of the track section that is adjacent to and parallel to the freezer box. The first cooling bed and the heat transfer bed are located on the inner side of the other two parts of the track. During the operation of the track, the contact plates can be pre-cooled by the first cooling bed, frozen by the second cooling bed, and then heated by the heat transfer bed to achieve de-icing. The track tilt corresponding to the heat transfer bed is located above the buffer slope and the tiltable plate.

[0009] A clean water spray pipe for cleaning the contact plates is provided on the outer side of the track corresponding to the first cooling bed. The first cooling bed, the second cooling bed, and a heat transfer bed are respectively installed on the slide rails perpendicular to the horizontally set track sections. The second cooling bed and the heat transfer bed are connected by a transmission rod. An elliptical transmission shaft is set in the triangular space formed by the track. A pair of steel plates are respectively connected to the first cooling bed and the second cooling bed on the outer side of the elliptical transmission shaft. When the elliptical transmission shaft rotates, it squeezes the steel plates to open and push the first cooling bed and the second cooling bed to move on the slide rails and make close contact with the track. At the same time, it drives the transmission rod to make the heat transfer bed move on the slide rails and also make close contact with the track.

[0010] At least one of the three rotating rollers is elastically connected to the outer casing or structural support of the device, while the other two are rigidly fixed.

[0011] The bottom surfaces of the first cooling bed, the second cooling bed, and the heat transfer bed that are in contact with the track are made of materials with high thermal conductivity, while the other surfaces are made of materials with low thermal conductivity.

[0012] The outer casing is equipped with a compressor unit and a refrigerant tank. The refrigerant is introduced into the first and second heat transfer beds through heat exchange hoses and circulates. The heat transfer beds contain heating wires to achieve temperature control.

[0013] The first and second cooling beds use the environment as a cold source, and the heat transfer bed contains heating wires to achieve temperature control.

[0014] The contact plates are made of a material with high thermal conductivity, and are arranged in multiple rows and columns with staggered intervals on the track.

[0015] A flexible, one-way opening and closing heat-insulating baffle is installed between the refrigeration box and the track.

[0016] The outside of the water purification spray pipe is equipped with a liftable sealing cover.

[0017] A stirring device is installed on one side of the freezer.

[0018] The beneficial effects of this invention are:

[0019] 1. The semi-continuous contact freezing wastewater separation device of the present invention highly integrates the processes of "pre-cooling", "freezing" and "de-icing". Based on the principle of freezing separation, it improves the treatment effect, makes the device more energy-efficient, has low operating costs, and is simple, reliable, easy and flexible to operate, and easy to replicate and scale up.

[0020] 2. The device achieves semi-continuous operation, has strong continuous processing capacity, and high efficiency in producing ice per batch. The volume of ice produced in a single freezing operation can reach 60% of the total water volume in the freezer. Wastewater can be concentrated through multiple treatments before being discharged and centrally disposed of. The produced ice can be used to pre-cool wastewater or stored directly, effectively ensuring the recycling of energy; it can also be sold to cold chain and cold storage facilities, creating value.

[0021] 3. The treated effluent from the device exhibits good performance in the removal rates of COD, TOC, inorganic salts, and heavy metal ions. When the concentration of impurities in the raw wastewater is below 1 g / L, the removal efficiency of the device can reach 95%; when the concentration of impurities in the raw wastewater is above 5 g / L, the removal efficiency of the device can reach 60%. Furthermore, the device parameters can be adjusted to target different types and volumes of wastewater for specific treatment purposes.

[0022] 4. In some cold regions and seasons, the environment can be used as a cold source instead of compressor units to further reduce energy consumption. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the semi-continuous contact freezing type sewage / wastewater separation and treatment device of the present invention.

[0024] Figure 2a This is a schematic diagram of the elliptical drive shaft of the semi-continuous contact freezing type sewage / wastewater separation and treatment device of the present invention when it is not in operation.

[0025] Figure 2b This is a schematic diagram of the elliptical drive shaft of the semi-continuous contact freezing type sewage / wastewater separation and treatment device of the present invention during transmission.

[0026] Figure 3 This is a schematic diagram showing the relative positions of the track and contact plates of the semi-continuous contact freezing type sewage / wastewater separation and treatment device of the present invention.

[0027] Figure 4 This is a graph showing the change in pollutant concentration before and after wastewater treatment using the device of the present invention.

[0028] Figure 5 The diagram shows the pollutant removal rate before and after wastewater treatment using the device of the present invention.

[0029] In the diagram: 1. Sealing cover, 2. Clean water spray pipe, 3-1 First cooling bed, 3-2 Second cooling bed, 4. Rotating roller, 5. Heat exchange hose, 6. Refrigerant box, 7. Compressor unit, 8. Freezer, 9. Concentrated wastewater outlet, 10. Ice water outlet, 11. Track, 12. Slide rail, 13. Contact plate, 14. Heat transfer bed, 15. Drive rod, 16. Steel sheet, 17. Elliptical drive shaft, 18. Insulation baffle, 19. Stirring device, 20. Tilting plate, 21. Buffer slope, 22. Storage refrigerator, 23. Water inlet precooling pipe, 24. Outer shell. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figure 1-3 As shown, the semi-continuous contact freezing type sewage / wastewater separation and treatment device of the present invention has a storage refrigerator 22 provided on one side of the bottom of the inner side of the outer shell 24, and a buffer slope 21 facing the storage refrigerator on the other side. The lower half of the buffer slope 21 is located in the storage refrigerator 22. The freezer 8 is set on the top surface of the storage refrigerator 22 on the side away from the buffer slope 21. A flip-top plate 20 for dust prevention and heat preservation is provided between the storage refrigerator 22 and the buffer slope 21 to seal the top of the storage refrigerator 22. The flip-top plate 20 can guide the ice blocks falling from the top into the storage refrigerator 22. A concentrated wastewater outlet 9 communicating with the freezer 8 and an ice water outlet 10 communicating with the storage refrigerator 22 are provided on the outer side of the outer shell 24 on the side opposite to the buffer slope 21. The external water inlet precooling pipe 23 communicates with the freezer 8 through the buffer slope 21 and the interior of the storage refrigerator 22.

[0034] A track 11 is installed directly above the freezer 8 inside the outer shell. The track 11 is constrained by three rotating rollers 4 and divided into three parts. One part is parallel to the freezer 8 and close to the top of the freezer 8. Contact plates 13 are equidistantly arranged on the outer side of the track 11. The contact plates 13 can be immersed into the freezer for a certain length and can be removed from the freezer 8 with a certain amount of ice attached. Two cooling beds and one heat transfer bed are arranged in the triangular space enclosed by the track 11. The second cooling bed 3-2 is located on the inner side of the part of the track 11 that is close to and parallel to the freezer 8. The first cooling bed 3-1 and the heat transfer bed 14 are located on the inner side of the other two parts of the track 11. During the operation of the track 11, the contact plates can be pre-cooled by the first cooling bed 3-1, frozen by the second cooling bed 3-2, and then heated by the heat transfer bed 14 to achieve de-icing. The track at the position corresponding to the heat transfer bed 14 is inclined above the buffer slope 21 and the tumbler plate 20.

[0035] A clean water spray pipe 2 for cleaning the contact plate 13 is provided on the outer side of the track 11 corresponding to the first cooling bed 3-1. The first cooling bed 3-1, the second cooling bed 3-2 and a heat transfer bed 14 are respectively installed on the slide rail 12 perpendicular to the horizontally set track section. The second cooling bed 3-2 and the heat transfer bed 14 are connected by a transmission rod 15. An elliptical transmission shaft 17 is provided in the triangular space enclosed by the track 11. A pair of steel plates 16 are provided on the outer side of the elliptical transmission shaft 17 and respectively connected to the first cooling bed 3-1 and the second cooling bed 3-2. When the elliptical transmission shaft 17 rotates, it squeezes the steel plates 16 to open and push the first cooling bed 3-1 and the second cooling bed 3-2 to move on the slide rail 12 and make close contact with the track 11. At the same time, it drives the transmission rod 15 to make the heat transfer bed 14 move on the slide rail 12 and also make close contact with the track 11.

[0036] At least one of the three rotating rollers 4 is elastically connected to the outer casing 24 or structural support of the device, while the other two are rigidly fixed.

[0037] The bottom surfaces of the first cooling bed 3-1, the second cooling bed 3-2, and the heat transfer bed 14 that are in contact with the track 11 are made of materials with high thermal conductivity, while the other surfaces are made of materials with low thermal conductivity.

[0038] The outer casing 24 is equipped with a compressor unit 7 and a refrigerant box 6. The refrigerant is introduced into the first cooling bed 3-1 and the second cooling bed 3-2 through the heat exchange hose 5 and circulates. The heat transfer bed 14 contains heating wires to achieve temperature control.

[0039] The first cooling bed 3-1 and the second cooling bed 3-2 use the environment as a cold source, and the heat transfer bed 14 contains heating wires to achieve temperature control.

[0040] The contact piece 13 is made of a material with high thermal conductivity, and the contact pieces are arranged in multiple rows and columns at staggered intervals on the track 11.

[0041] A flexible, one-way opening and closing heat-insulating baffle 17 is installed between the freezer box 8 and the track 11.

[0042] The outside of the water purification spray pipe 2 is equipped with a liftable sealing cover 1.

[0043] A stirring device 19 is installed on one side inside the freezer 8.

[0044] Specifically, a storage refrigerator 22 is located directly below the freezer 8; a concentrated wastewater outlet 9 and an ice water outlet 10 are respectively located on one side of the freezer 8 and the storage refrigerator 22, and a buffer slope 21 is fixed on the other side, with a tilting plate 20 at the connection point; a pre-cooling inlet pipe 23 connects to the freezer 8 via the buffer slope 21 and the storage refrigerator 22, and the wastewater is pre-cooled in the storage refrigerator 22 before entering the freezer 8; a stirring device 19 is installed on one side inside the freezer 8. Tracks 11 are installed directly above the freezer 8, with flexible one-way opening and closing heat-insulating baffles 17 installed between them. The track is constrained by three rotating rollers 4 and divided into three sections, one of which is parallel to the freezer compartment 8. Vertical contact plates 13 are equidistantly arranged on the outer side of the track 11. Two cooling beds 3-1 and 3-2 and one heat transfer bed 14 are all installed on the slide rail 12, which is perpendicular to the horizontally arranged track section (i.e., perpendicular to the ground and the freezer compartment 8), located on the inner side of the track 11. The second cooling bed 3-2 is parallel to the freezer compartment 8, and the first cooling bed 3-1 and the heat transfer bed 14 are located at the front and rear sections of the track 11 in the direction of rotation, respectively. At least one of the three rotating rollers 4 is elastically connected to the outer casing 24 or structural support of the device, while the others are rigidly fixed.

[0045] The contact plates 13 are all made of aluminum and aluminum alloy with high thermal conductivity. The contact plates are staggered on the track 11. The parts of the track connected to the contact plates are made of the same material, while the other parts not connected to the contact plates 13 are made of engineering plastic with low thermal conductivity. In addition, the bottom surface of the cooling bed and the heat transfer bed 14 that are in contact with the track are also made of aluminum and aluminum alloy with high thermal conductivity, while the other surfaces are made of foamed polyurethane with low thermal conductivity. The outer shell 24 is equipped with a refrigerant tank 6 for cooling by the compressor unit 7. The refrigerant is introduced into the cooling bed through the heat exchange hose 5 and circulates to achieve cooling control. The heat transfer bed 14 contains heating wires to achieve heating control.

[0046] When the elliptical drive shaft 17 rotates to the vertical position, it compresses the steel sheet 16, causing it to expand and drive the drive rod 15, which in turn pushes the cooling bed and the heat transfer bed 14 to move on the slide rail 12 and make close contact with the track 11. When the elliptical drive shaft returns to the horizontal position, the steel sheet 16 returns to its original position and is locked. The drive rod, the cooling bed, and the heat transfer bed also return to their original positions and separate from the track 11, realizing the lifting and pressing process.

[0047] The device operates primarily through three processes: pre-cooling, freezing, and de-icing to treat wastewater. A clean water spray pipe 2 is installed on the outer side of the conveyor belt 11 corresponding to the first cooling bed 3-1, and a liftable sealing cover 1 is mounted on its outer side. When the sealing cover 1 is lowered, the cooling bed and heat transfer bed 14 come into contact with the conveyor belt 11. The contact pieces 13 located inside the first cooling bed 3-1 and the sealing cover 1 undergo a pre-cooling process, being cleaned by the clean water spray pipe 2 and forming a clean ice layer on their surface. The contact pieces 13 located in the freezing chamber 8 undergo a freezing process, receiving low temperatures from the second cooling bed 3-2, further growing and condensing on the clean ice layer, thus achieving the separation and treatment of wastewater in the freezing chamber 8. The contact pieces 13 located on the heat transfer bed 14 absorb heat from the heat transfer bed and undergo a de-icing process. The melted ice blocks pass through the buffer slope 21 and the tilting plate 20, entering the storage refrigerator 22.

[0048] Subsequently, the sealing cover 1 rises, the elliptical drive shaft 17 rotates, and the cooling bed and heat transfer bed 14 separate from the track 11. The movement of the track allows the pre-cooled contact piece to enter the freezing chamber 8. The "frozen" contact piece 13 reaches the "de-icing" position, and the "de-iced" contact piece is directly below the sealing cover 1 and the clean water spray pipe 2. As the sealing cover 1 descends, the cooling bed and heat transfer bed 14 come into contact with the track 11, starting a new round of "pre-cooling," "freezing," and "de-icing" processes. The elastically connected rotating roller 4, under the lifting and pressing action of the cooling bed and heat transfer bed, increases the length of the contact piece extending into the freezing chamber and ensures the thermal conductivity and sealing between the components. In this way, the device repeatedly performs the "pre-cooling," "freezing," and "de-icing" processes, achieving semi-continuous and efficient separation processing.

[0049] The buffer slope is used to buffer the impact of falling ice blocks on the device and guide the ice blocks into the storage refrigerator. A flip plate is installed at the connection between the two for dust prevention and heat preservation. The water inlet precooling pipe is connected to the freezer through the buffer slope and the storage refrigerator. Wastewater can be precooled in the storage refrigerator before entering the freezer. The track is installed directly above the freezer and is constrained by three rotating rollers, divided into three parts, one of which is parallel to the freezer. Contact plates are equidistantly arranged on the outer side of the track, which can be immersed into the freezer for a certain length and can be removed from the freezer even when a certain amount of ice blocks are attached.

[0050] The system consists of two cooling beds and one heat transfer bed. One cooling bed is located inside the track section parallel to the freezing chamber, while the other cooling bed and heat transfer bed are located inside the other two sections of the track. Their relative positions ensure that during track operation, the contact plates undergo pre-cooling and freezing sequentially via the two cooling beds before being heated and de-iced by the heat transfer bed. A clean water spray pipe is installed on the outer side of the track corresponding to the cooling bed that performs the pre-cooling function. This cleans the contact plates while adhering some clean water, helping to form a clean ice crystal layer on the surface before entering the freezing chamber, thereby improving the cleanliness of the ice formation and ensuring effective wastewater treatment. A retractable sealing cover is installed outside the clean water spray pipe. When freezing occurs, the sealing cover lowers to enhance the pre-cooling effect and rises after freezing, without affecting the operation of the track.

[0051] When the elliptical drive shaft rotates to a certain position, such as from a locked horizontal position to a vertical position, the extruded steel sheet expands, driving the drive rod and further propelling the cooling and heat transfer beds on the slide, ensuring close contact with the track and achieving temperature conduction. When the elliptical drive shaft returns to its original position, the steel sheet returns to its original position, and the drive rod, cooling and heat transfer beds also return to their original positions and separate from the track. At least one of the three rotating rollers is elastically connected. When the elliptical drive shaft rotates, causing displacement of the drive rod, cooling and heat transfer beds, the track can achieve greater deformation accordingly, improving the fit with the cooling and heat transfer beds and increasing the length of the contact plates extending into the freezing chamber, ensuring effective freezing and condensation.

[0052] The parts of the track connected to the contact plates are made of a material with high thermal conductivity, while the other parts not connected to the contact plates are made of a material with low thermal conductivity, which reduces energy loss to a certain extent. The contact plates are also made of a material with high thermal conductivity and can be staggered at intervals on the track to prevent ice crystals from condensing too large on the contact plates, making it easier for ice to melt and fall off in time, while also reducing the burden on the track during ice making.

[0053] The device is equipped with a flexible, one-way opening and closing heat-insulating baffle between the freezing chamber and the track. When the contact plates in the freezing chamber are making ice, the heat-insulating baffle can seal the track and the freezing chamber, reducing energy loss and preventing dust. After freezing is completed, the heat-insulating baffle opens with the movement of the track. A flip-up heat-insulating baffle is set between the buffer slope and the freezing chamber, which can greatly keep the ice in the storage refrigerator warm while the ice blocks enter the storage refrigerator smoothly.

[0054] This invention, based on the principle of progressive freeze-separation, organically combines freeze-separation with the cyclic movement of a conveyor belt. Wastewater is treated through three stages: pre-cooling, freezing, and thawing separation. The wastewater crystallizes on contact plates and is then transferred by the conveyor belt, separating clean ice. The ice can be stored or reused for residual cooling. The relatively clean water obtained by melting the ice is then released. By controlling the conveyor belt, rotating rollers, inlet pre-cooling pipe, ice water outlet, concentrated wastewater outlet, cooling bed, and heat transfer bed, automatic water intake, freezing, and collection functions can be easily achieved. The structure is simple and stable, effectively solving the ice-water separation problem in wastewater treatment. It is highly adaptable to different types of wastewater, especially difficult-to-treat inorganic salts and volatile small-molecule organic compounds. Equipment parameters can be adjusted according to the type of wastewater, demonstrating strong adaptability and broad application prospects in various water treatment fields.

[0055] The device of this invention has high water production efficiency and high removal rate of dissolved substances, and the treatment effect is as follows: Figure 4 , 5 As shown in Table 1, when the solutes in the original wastewater are sodium sulfate and glucose and their concentrations are less than 1 g / L, after one treatment process, the device can achieve a removal efficiency of about 95% for the COD in sulfate ions and glucose, and can reduce the volume of wastewater by about 60%.

[0056] Table 1 shows the processing data of the device for solutes in solution.

[0057] sulfate ions 460 20 95.65％ Glucose (COD) 137.84 8.42 93.89％ Actual wastewater (sulfate ions) 73.8 7.15 90.68％ Actual wastewater (COD) 201.84 30 85.14％

[0058] In the treatment of MVR condensate wastewater, ion chromatography and potassium dichromate oxidation were used to detect the sulfate ion concentration and COD in the effluent, respectively. The removal rate of sulfate ions in the effluent was approximately 90%, and the COD removal rate was approximately 85%. The wastewater can be concentrated through multiple treatment processes before being discharged for centralized disposal. The ice produced can be used not only for pre-cooling the wastewater but also sold to cold chain and cold storage facilities, creating value.

[0059] In summary, the content of this invention is not limited to the above-described embodiments. Those skilled in the art can easily propose other embodiments within the technical guiding principles of this invention, but such embodiments are all included within the scope of this invention.

Claims

1. A semi-continuous contact freezing type sewage / wastewater separation and treatment device, characterized in that, A refrigerator (22) is provided on one side of the bottom inside the outer shell (24), and a buffer slope (21) is provided on the other side facing the refrigerator. The lower half of the buffer slope (21) is located in the refrigerator (22). The freezer (8) is located on the top surface of the refrigerator (22) on the side away from the buffer slope (21). A flip-top plate (20) for dust prevention and heat preservation is provided between the refrigerator (22) and the buffer slope (21) to seal the top of the refrigerator (22). The flip-top plate (20) can guide the ice blocks falling from the top into the refrigerator (22). A concentrated wastewater outlet (9) communicating with the freezer (8) and an ice water outlet (10) communicating with the refrigerator (22) are provided on the outside of the outer shell (24) on the side opposite to the buffer slope (21). An external water inlet precooling pipe (23) communicates with the freezer (8) through the buffer slope (21) and the inside of the refrigerator (22). A track (11) is installed directly above the freezer (8) inside the outer shell. The track (11) is constrained by three rotating rollers (4) and divided into three parts. One part is parallel to the freezer (8) and close to the top of the freezer (8). Contact plates (13) are equidistantly arranged on the outer side of the track (11). The contact plates (13) can be immersed into the freezer for a certain length and can be removed from the freezer (8) with a certain amount of ice attached. Two cooling beds and one heat transfer bed are arranged in the triangular space enclosed by the track (11). The cooling bed (3-2) is located on the inner side of the track (11) section that is adjacent to and parallel to the freezing box (8). The first cooling bed (3-1) and the heat transfer bed (14) are located on the inner side of the other two sections of the track (11), so that during the operation of the track (11), the contact plates can be pre-cooled by the first cooling bed (3-1), frozen by the second cooling bed (3-2), and then heated by the heat transfer bed (14) to achieve de-icing. The track tilt corresponding to the position of the heat transfer bed (14) is located above the buffer slope (21) and the flip-over plate (20). A clean water spray pipe (2) for cleaning the contact plate (13) is provided on the outside of the track (11) corresponding to the first cooling bed (3-1). The first cooling bed (3-1), the second cooling bed (3-2), and a heat transfer bed (14) are respectively installed on the slide (12) perpendicular to the horizontally set track section. The second cooling bed (3-2) and the heat transfer bed (14) are connected by a transmission rod (15). An elliptical transmission shaft (17) is provided in the triangular space enclosed by the track (11). A pair of steel plates (16) are provided on the outer side of the elliptical drive shaft (17) and connected to the first cooling bed (3-1) and the second cooling bed (3-2) respectively. When the elliptical drive shaft (17) rotates, the steel plates (16) are squeezed open and push the first cooling bed (3-1) and the second cooling bed (3-2) to move on the slide (12) and make close contact with the track (11). At the same time, the drive rod (15) is driven to make the heat transfer bed (14) move on the slide (12) and also make close contact with the track (11). At least one of the three rotating rollers (4) is elastically connected to the outer casing (24) or structural support of the device, while the other two are rigidly fixed. The bottom surfaces of the first cooling bed (3-1), the second cooling bed (3-2), the heat transfer bed (14) in contact with the track (11) are made of materials with high thermal conductivity, while the other surfaces are made of materials with low thermal conductivity. The contact piece (13) is made of a material with high thermal conductivity, and the contact pieces are arranged in multiple rows and columns at staggered intervals on the track (11).

2. The semi-continuous contact freezing type sewage / wastewater separation and treatment device according to claim 1, characterized in that, The outer casing (24) is equipped with a compressor unit (7) and a refrigerant tank (6). The refrigerant is fed into the first cooling bed (3-1) and the second cooling bed (3-2) through a heat exchange hose (5) and circulates. The heat transfer bed (14) contains heating wires to achieve temperature control.

3. The semi-continuous contact freezing type sewage / wastewater separation and treatment device according to claim 1, characterized in that, The first cooling bed (3-1) and the second cooling bed (3-2) use the environment as a cold source, and the heat transfer bed (14) contains heating wires to achieve temperature control.

4. The semi-continuous contact freezing type sewage / wastewater separation and treatment device according to claim 1, characterized in that, A flexible, one-way opening and closing heat-insulating baffle (18) is installed between the freezer (8) and the track (11).

5. The semi-continuous contact freezing type sewage / wastewater separation and treatment device according to claim 1, characterized in that, The water purification spray pipe (2) is equipped with a liftable sealing cover (1) on the outside.

6. The semi-continuous contact freezing type sewage / wastewater separation and treatment device according to claim 1, characterized in that, A stirring device (19) is installed on one side inside the freezer (8).

Images