Resource recovery device suitable for fish meal production wastewater

Abstract

The utility model provides a resource recovery device suitable for fish meal production wastewater. According to the technical scheme, the resource recovery device comprises a heat exchange mechanism; a heating mechanism; the heating mechanism is connected with the heat exchange mechanism; an air floatation mechanism; the input end of the air floatation mechanism is connected with the heating mechanism; the first output end of the air flotation mechanism is connected with the heat pump drying mechanism, and the second output end of the air flotation mechanism is connected with the heat exchange mechanism; a heat pump drying mechanism; the heat pump drying mechanism is connected with the air flotation mechanism; the device has the advantages that the fish meal can be recycled without adding chemicals into the wastewater, and the resource utilization efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of fishmeal recycling technology, and in particular to a resource recycling device suitable for fishmeal production wastewater. Background Technology

[0002] Fishmeal, as a versatile raw material, is often used in food consumption, feed processing, and aquaculture. However, the production of fishmeal often generates a large amount of wastewater, which contains a large amount of protein and is characterized by high ammonia nitrogen, high organic matter, and high turbidity. The protein in the wastewater not only has a significant impact on subsequent wastewater treatment but also leads to resource waste. Most existing fishmeal recycling technologies involve adding chemicals to the wastewater, which reduces the subsequent utilization value of the recycled material and therefore needs improvement. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a resource recovery device suitable for fishmeal production wastewater, thereby solving the problems existing in related technologies. The technical solution is as follows:

[0004] This application provides a resource recovery device suitable for fishmeal production wastewater, comprising: a heat exchange mechanism; a heating mechanism; the heating mechanism being connected to the heat exchange mechanism; an air flotation mechanism; the input end of the air flotation mechanism being connected to the heating mechanism; a first output end of the air flotation mechanism being connected to a heat pump drying mechanism; a second output end of the air flotation mechanism being connected to the heat exchange mechanism; and a heat pump drying mechanism being connected to the air flotation mechanism.

[0005] In one embodiment, the heat exchange mechanism includes: a heat exchanger; a cold inlet, a cold outlet, a hot inlet, and a hot outlet are provided on the heat exchanger; the cold inlet is connected to the upstream fishmeal production wastewater end; the cold outlet is connected to the heating mechanism; the hot inlet is connected to the air flotation mechanism; and the hot outlet is connected to the downstream wastewater treatment end.

[0006] In one embodiment, the heating mechanism includes: a heating zone; a heating plate and a stirrer for continuously mixing wastewater are provided in the heating zone; the input end of the heating zone is connected to the cold water outlet, and the output end of the heating zone is connected to the air flotation mechanism.

[0007] In one embodiment, the flotation mechanism includes: a flotation tank, a sludge scraper, a pressurized dissolved air tank, and a sludge collector; one end of the pressurized dissolved air tank is connected to the output end of the heating zone, and the other end of the pressurized dissolved air tank is connected to the flotation tank; the sludge scraper is disposed at the upper end of the flotation tank; the sludge collector is disposed on one side of the flotation tank and is located below the sludge scraper; the sludge collector is connected to the heat pump drying mechanism.

[0008] In one embodiment, a high-temperature air flotation outlet is provided on the air flotation tank; the high-temperature air flotation outlet is connected to the hot water inlet.

[0009] In one embodiment, the heat pump drying mechanism includes: a hot air drying zone; a condenser, an evaporator, and a compressor are disposed in the hot air drying zone; the hot air drying zone is connected to the slag collector.

[0010] In one embodiment, the condenser is connected to the evaporator; an expansion valve is provided at the connection between the condenser and the evaporator.

[0011] In one embodiment, a heat source mechanism is further included; one end of the heat source mechanism is connected to the heating mechanism, and the other end of the heat source mechanism is connected to the heat pump drying mechanism.

[0012] In one embodiment, the heat source is residual heat energy from factory processes and waste condensate from the factory.

[0013] The advantages or beneficial effects of the above technical solutions include at least the following:

[0014] The resource recovery device of this application is used to recover protein from wastewater generated during the production process. The wastewater passes through a heat exchange mechanism, a heating mechanism, an air flotation mechanism and a heat pump drying mechanism in sequence to produce dried fishmeal. No chemicals need to be added during the entire wastewater treatment process. The heat source utilizes residual heat energy and waste condensate generated by the factory process, which reduces treatment costs, improves resource utilization efficiency, and also improves the usability of the recovered fishmeal.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0017] Figure 1 This is a schematic diagram of the connection of the first module of this utility model;

[0018] Figure 2 This is a schematic diagram of the connection of the second module of this utility model.

[0019] In the diagram: 1. Heat exchange mechanism; 11. Heat exchanger; 12. Cold water inlet; 13. Cold water outlet; 14. Hot water inlet; 15. Hot water outlet; 2. Heating mechanism; 21. Heating plate; 22. Agitator; 3. Air flotation mechanism; 31. Air flotation tank; 32. Sludge scraper; 33. Pressurized dissolved air tank; 34. Sludge collector; 4. Heat pump drying mechanism; 41. Condenser; 42. Evaporator; 43. Compressor; 44. Expansion valve; 5. High-temperature air flotation outlet; 6. Heat source mechanism. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described to make the objectives, features, and advantages of this invention more apparent. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 and Figure 2 As shown, this utility model provides a resource recovery device suitable for fishmeal production wastewater, including: a heat exchange mechanism 1; a heating mechanism 2; the heating mechanism 2 is connected to the heat exchange mechanism 1; an air flotation mechanism 3; the input end of the air flotation mechanism 3 is connected to the heating mechanism 2; the first output end of the air flotation mechanism 3 is connected to a heat pump drying mechanism 4, and the second output end of the air flotation mechanism 3 is connected to the heat exchange mechanism 1; the heat pump drying mechanism 4; and the heat pump drying mechanism 4 is connected to the air flotation mechanism 3.

[0023] In this embodiment, the two ports of the heat exchange mechanism 1 are respectively connected to the upstream fishmeal production process wastewater end and the downstream wastewater treatment end, and the two different output ends of the air flotation mechanism 3 are respectively connected to the heat exchange mechanism 1 and the heat pump drying mechanism 4. After the wastewater passes through the heat exchange mechanism 1, the heating mechanism 2, the air flotation mechanism 3 and the heat pump drying mechanism 4 in sequence, dried fishmeal can be produced.

[0024] The wastewater generated during the fishmeal production process is at a low temperature. The wastewater first enters the heat exchange mechanism 1 and exchanges heat with the effluent from the air flotation mechanism 3. After passing through the heat exchange mechanism 1, the low-temperature wastewater is preheated and then flows into the heating mechanism 2. Meanwhile, the temperature of the air flotation effluent in the heat exchange mechanism 1 decreases, transforming into the final effluent and flowing to the downstream wastewater treatment end. The wastewater in the heating mechanism 2 is heated non-contactly and reaches the set temperature before flowing into the air flotation mechanism 3. The fishmeal collected by the air flotation mechanism 3 has a high moisture content. The water-containing fishmeal enters the heat pump drying mechanism 4 for dehydration, drying, and purification, achieving the effect of fishmeal recovery.

[0025] Under one implementation condition, the low-temperature wastewater at the front end is maintained at 0-20°C. After passing through heat exchange mechanism 1, the temperature is raised to 30-40°C. The wastewater is then transported through pipelines to heating mechanism 2, where it is heated to 55-65°C using a steam heat source for non-contact heating. The heating mechanism 2 is continuously stirred, and the wastewater is then transported to flotation mechanism 3. After being treated by flotation mechanism 3, water-containing fishmeal is separated and discharged from the slag discharge section. The separated fishmeal has a water content of 80-90%. The effluent then passes through heat exchange mechanism 1 again to cool down to 30-35°C before being connected to the subsequent biological treatment process.

[0026] No chemicals need to be added during the above wastewater treatment process. The heat source utilizes the residual heat energy and waste condensate produced by the factory process, which reduces treatment costs, improves resource utilization efficiency, and also improves the usability of recycled fishmeal.

[0027] Further, the heat exchange mechanism 1 includes: a heat exchanger 11; a cold inlet 12, a cold outlet 13, a hot inlet 14, and a hot outlet 15 are provided on the heat exchanger 11; the cold inlet 12 is connected to the upstream fishmeal production wastewater end; the cold outlet 13 is connected to the heating mechanism 2; the hot inlet 14 is connected to the air flotation mechanism 3; and the hot outlet 15 is connected to the downstream wastewater treatment end.

[0028] In this embodiment, the heat exchanger 11 uses a heat exchanger with a relatively large aperture to prevent blockage caused by fishmeal precipitation. The heat exchanger 11 is provided with four ports, namely a cold inlet 12, a cold outlet 13, a hot inlet 14, and a hot outlet 15. The cold inlet 12 is connected to the upstream fishmeal production process wastewater end (due to the requirements of the upstream production process, the wastewater is kept at a low temperature). The heat exchanger 11 initially heats the wastewater, so that the heated wastewater is output to the heating mechanism 2 through the cold outlet 13. The hot inlet 14 is connected to the air flotation mechanism 3. The high-temperature air flotation effluent generated by the air flotation mechanism 3 flows into the heat exchanger 11 through the hot inlet 14 and exchanges heat with the initial wastewater to achieve a heating effect and improve resource utilization efficiency. The hot outlet 15 is connected to the downstream wastewater treatment end, and the hot outlet 15 can output the final cooled effluent to the downstream wastewater treatment end.

[0029] Furthermore, the heating mechanism 2 includes: a heating zone; a heating plate 21 and a stirrer 22 for continuously mixing wastewater are provided in the heating zone; the input end of the heating zone is connected to the cold water outlet 13, and the output end of the heating zone is connected to the air flotation mechanism 3.

[0030] In this embodiment, the heating zone is connected to the external plant area and the cold water outlet 13 of the heat exchanger 11. A heating plate 21 is arranged in the heating zone. The residual heat energy produced in the external plant area flows through the heating plate 21 in the form of high-temperature condensate or steam. The heating plate 21 continuously supplies heat to the heating zone to heat the wastewater in a non-contact manner. During the heating stage, proteins precipitate and coagulate, so that the fishmeal wastewater passing through the heating zone reaches the target temperature. The stirrer 22 is set in the heating zone and above the heating plate 21. The stirrer 22 can continuously stir and mix the fishmeal wastewater passing through the heating zone to ensure that all substances in the wastewater are in a completely mixed state.

[0031] Further, the flotation mechanism 3 includes: a flotation tank 31, a slag scraper 32, a pressurized dissolved air tank 33, and a slag collector 34; one end of the pressurized dissolved air tank 33 is connected to the output end of the heating zone, and the other end of the pressurized dissolved air tank 33 is connected to the flotation tank 31; the slag scraper 32 is located at the upper end of the flotation tank 31; the slag collector 34 is located on one side of the flotation tank 31, and the slag collector 34 is located below the slag scraper 32; the slag collector 34 is connected to the heat pump drying mechanism 4.

[0032] In this embodiment, the fully heated wastewater output by the heating mechanism 2 first enters the pressurized dissolved air tank 33. Air dissolves in the wastewater under ultra-high pressure. Subsequently, the wastewater enters the flotation tank 31. The supersaturated air in the dissolved air water is released in the form of microbubbles. The bubbles of the precipitates in the wastewater gradually become larger, and the overall specific gravity of the precipitates becomes lighter and lighter. The proteins precipitated in the wastewater will gradually separate from the wastewater under the action of flotation and eventually float to the surface. The sludge scraper 32 is set at the upper end of the flotation tank 31. The sludge scraper 32 can collect the precipitated proteins into the sludge collector 34. The sludge collector 34 can output the water-containing fishmeal to the heat pump drying mechanism 4 for drying to remove moisture.

[0033] Furthermore, a high-temperature air flotation outlet 5 is provided on the air flotation tank 31; the high-temperature air flotation outlet 5 is connected to the hot water inlet 14.

[0034] In this embodiment, a high-temperature flotation outlet 5 is provided on the outside of the flotation tank 31. The high-temperature flotation outlet water generated by the flotation tank 31 is connected to the heat exchanger 11 through the high-temperature flotation outlet 5. The high-temperature flotation outlet water exchanges heat with the initial low-temperature wastewater. After passing through the heat exchanger 11, the flotation outlet water is transformed into cooling outlet water.

[0035] Furthermore, the heat pump drying mechanism 4 includes: a hot air drying zone; a condenser 41, an evaporator 42 and a compressor 43 are provided in the hot air drying zone; the hot air drying zone is connected to the slag collector 34.

[0036] In this embodiment, the condenser 41, evaporator 42, and compressor 43 together constitute a heat pump system. The initial heat source of the heat pump system comes from the residual heat energy (condensate or steam) produced in the industrial plant. In the evaporator 42 unit, the refrigerant absorbs heat energy and evaporates into gas at low temperature and low pressure. The gas is further pressurized and heated by the compressor 43, and then the room temperature air is heated to high temperature air in the condenser 41. The fish meal collected by the air flotation mechanism 3 has a high water content. After the water-containing fish meal is transported to the hot air drying zone, the high temperature air dries the water-containing fish meal and produces dried fish meal.

[0037] Furthermore, the condenser 41 is connected to the evaporator 42; an expansion valve 44 is provided at the connection between the condenser 41 and the evaporator 42.

[0038] In this embodiment, the expansion valve 44 is located between the condenser 41 and the evaporator 42. The refrigerant cools down and releases heat to become liquid in the condenser 41, and then passes through the expansion valve 44 to reduce its pressure before entering the next cycle. The expansion valve 44 throttles the medium-temperature, high-pressure liquid refrigerant to become low-temperature, low-pressure wet vapor. The refrigerant then absorbs heat in the evaporator 42 to achieve a cooling effect. The expansion valve 44 controls the valve flow rate by changing the superheat at the end of the evaporator 42 to prevent insufficient utilization of the evaporator 42 area and knocking.

[0039] Furthermore, it also includes a heat source mechanism 6; one end of the heat source mechanism 6 is connected to the heating mechanism 2, and the other end of the heat source mechanism 6 is connected to the heat pump drying mechanism 4. The heat source mechanism 6 is the residual heat energy from the factory process and the factory waste condensate.

[0040] In this embodiment, the heat source mechanism 6 is the residual heat energy from the factory process and the waste condensate from the factory. The two ends of the heat source mechanism 6 are connected to the heating mechanism 2 and the heat pump drying mechanism 4, respectively. The residual heat energy (condensate or steam) output by the heat source mechanism 6 is connected to the heating mechanism 2, which can heat the wastewater in the heating mechanism 2 in a non-contact manner, so that the wastewater is continuously heated to the set temperature and becomes fully heated wastewater. The residual heat energy (condensate or steam) output by the heat source mechanism 6 is connected to the heat pump drying mechanism 4. In the evaporator 42 unit, the refrigerant absorbs heat energy under low temperature and low pressure and evaporates into gas. The gas is further pressurized and heated by the compressor 43, and then the room temperature air is heated to high temperature air in the condenser 41, thereby forming the high temperature gas conditions of the hot air drying zone.

[0041] This utility model discloses a resource recovery device for fishmeal production wastewater. The functions of each module in each device in the embodiment can be found in the corresponding description in the above method. It has the advantages of recovering fishmeal without adding chemicals to the wastewater and improving resource utilization efficiency.

[0042] In this specification, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0043] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature. The terms "vertical," "horizontal," "left," "right," "above," "below," and similar expressions are for illustrative purposes only and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0044] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A resource recovery device suitable for fish meal production wastewater, characterized by, It comprises: a heat exchange mechanism; a heating mechanism; the heating mechanism is connected to the heat exchange mechanism; an air floatation mechanism; an input end of the air floatation mechanism is connected to the heating mechanism; a first output end of the air floatation mechanism is connected to a heat pump drying mechanism, and a second output end of the air floatation mechanism is connected to the heat exchange mechanism; a heat pump drying mechanism; the heat pump drying mechanism is connected to the air floatation mechanism.

2. The resource recovery device suitable for fish meal production wastewater according to claim 1, characterized in that, The heat exchange mechanism comprises a heat exchanger, and cold water inlets, cold water outlets, hot water inlets and hot water outlets are arranged on the heat exchanger; the cold water inlets are connected to an upstream fish meal production wastewater end; the cold water outlets are connected to the heating mechanism; the hot water inlets are connected to the air floatation mechanism; and the hot water outlets are connected to a downstream wastewater treatment end.

3. The resource recovery device suitable for fish meal production wastewater according to claim 2, characterized in that, The heating mechanism comprises a heating zone, a heating disc arranged in the heating zone, and a stirrer for continuously mixing wastewater; an input end of the heating zone is connected to the cold water outlets, and an output end of the heating zone is connected to the air floatation mechanism.

4. The resource recovery device suitable for fish meal production wastewater according to claim 3, characterized in that, The air floatation mechanism comprises an air floatation tank, a slag scraper, a pressurized dissolved gas tank and a slag collector; one end of the pressurized dissolved gas tank is connected to the output end of the heating zone, and the other end of the pressurized dissolved gas tank is connected to the air floatation tank; the slag scraper is arranged at the upper end of the air floatation tank; the slag collector is arranged at one side of the air floatation tank and below the slag scraper; and the slag collector is connected to the heat pump drying mechanism.

5. The resource recovery device suitable for fish meal production wastewater according to claim 4, characterized in that, A high-temperature air floatation water outlet end is arranged on the air floatation tank; and the high-temperature air floatation water outlet end is connected to the hot water inlets.

6. The resource recovery device suitable for fish meal production wastewater according to claim 4, characterized in that, The heat pump drying mechanism comprises a hot air drying zone, a condenser, an evaporator and a compressor arranged in the hot air drying zone; and the hot air drying zone is connected to the slag collector.

7. The resource recovery device suitable for fish meal production wastewater according to claim 6, characterized in that, The condenser is connected to the evaporator; and an expansion valve is arranged at the connection between the condenser and the evaporator.

8. The resource recovery device for fish meal production wastewater according to any one of claims 1 to 7, characterized in that, It further comprises a heat source mechanism; one end of the heat source mechanism is connected to the heating mechanism, and the other end of the heat source mechanism is connected to the heat pump drying mechanism.

9. The resource recovery device suitable for fish meal production wastewater according to claim 8, characterized in that, The heat source mechanism is factory process residual heat energy and factory waste condensate water.

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