A device for purifying sewage by using bio-fermented organic water-soluble fertilizer and a purification method thereof

Abstract

The present application belongs to the technical field of sewage treatment of machine water-soluble fertilizer production, and particularly relates to a sewage purification and recycling device for bio-fermentation organic water-soluble fertilizer and a purification method thereof. The device comprises a primary sedimentation tank and a secondary evaporation tank which are in communication with each other. The secondary evaporation tank is provided with a reflector, a light condensing cup, a flue gas ring channel and a cyclone paddle. The reflector is used for reflecting sunlight into the secondary evaporation tank. The sewage in the secondary evaporation tank is evaporated by flue gas. The flue gas ring channel is externally provided with branch pipes, reflective sheets, spoiler sheets, carbon film resistance sheets and a detection circuit. The cyclone paddle stirs the sewage to gather impurities by centrifugal force of cyclone, so as to avoid blockage and reduce the water level in the area affected by light and flue gas. The method comprises steps one to six. The present application reduces the intermediate water level by stirring and cyclone, can superimpose high-temperature flue gas and focused light beams in the thin water area, gather and precipitate at the edge to prevent blockage, and the steam flow can lift the spoiler sheets to indicate the signal of evaporation state.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment in the production of organic water-soluble fertilizers, and particularly relates to a wastewater purification and reuse device for biologically fermented organic water-soluble fertilizers and a purification method thereof. Background Art

[0002] Chicken manure is rich in nitrogen, phosphorus, and potassium, and can be converted into high-value-added organic water-soluble fertilizer after fermentation. Fermentation produces small-molecule organic acids, amino acids, and humic acid, which are over 95% water-soluble and can be quickly absorbed by crops. The main sources of wastewater during the biological fermentation of organic water-soluble fertilizers include raw material pretreatment wastewater, fermentation process wastewater, equipment cleaning wastewater, and finished product dilution and packaging wastewater. Purification methods for this wastewater include filtration, flocculation sedimentation, and high-temperature concentration. A search revealed the following related technologies:

[0003] 1. For example, China's invention with announcement number CN118479578B discloses an organic fertilizer production wastewater treatment device and a treatment method thereof. After filtering impurities with a filter screen, the organic fertilizer and debris intercepted on the filter screen can be cleaned to avoid clogging the filter holes.

[0004] 2. For example, China's invention with announcement number CN115893750A discloses a zero-emission system and method for treating high-concentration organic industrial wastewater. The system uses an MVR evaporator to evaporate and concentrate the wastewater. The concentrated water produced by the deep treatment reverse osmosis process is evaporated by the MVR and the evaporated crystallized concentrate is used for blending in the dehumidification and slag removal section.

[0005] In summary, the wastewater treatment of organic water-soluble fertilizer production contains lumpy black soldier fly eggs and chicken manure, some of which penetrate the filter. In addition, when entering the MVR evaporator, it is easy to scale and cause blockage. Therefore, the present invention proposes a purification and reuse device for the wastewater of biological fermentation of organic water-soluble fertilizer, which adopts high-temperature flue gas and solar energy concentrated evaporation to avoid blockage, and a wastewater purification method for organic water-soluble fertilizer. Summary of the Invention

[0006] The purpose of the present invention is to provide a wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizer and a purification method thereof, which uses a stirring vortex to lower the middle water level, can superimpose high-temperature flue gas and a focused light beam in a thin water area, gather precipitation at the edge to prevent blockage, and at the same time, the steam flow will raise a spoiler to indicate the evaporation status signal.

[0007] The technical solutions adopted by the present invention are as follows:

[0008] A wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers, comprising a primary sedimentation tank and a secondary evaporation tank connected to each other, wherein the secondary evaporation tank is provided with:

[0009] Reflectors and focusing cups are vertically distributed in sequence, wherein the reflectors are used to reflect sunlight into the secondary evaporation pool;

[0010] A flue gas ring duct is used to evaporate the sewage in the secondary evaporation pool through flue gas, and a branch pipe, a reflector, a spoiler, a carbon film resistor and a detection circuit are provided on the outside of the flue gas ring duct;

[0011] A swirl paddle stirs the sewage, gathers impurities with the centrifugal force of the swirl, avoids clogging, and lowers the water level in the area where light and smoke are exposed;

[0012] When sewage evaporates, smoke is diffused through the spoiler, and steam lifts the spoiler, causing the potential of the carbon film resistor to change, which is used to indicate the evaporation status signal.

[0013] As an optional solution, a flexible whip spaced apart from the spoiler is fixed to the bottom of the reflective sheet, an alloy spike for puncturing the foam is fixed to the outside of the flexible whip, and a float is fixed to the end of the flexible whip.

[0014] As an optional solution, a first filter screen and a second filter screen are provided inside the primary sedimentation tank at intervals, and a rotating horizontal axis for rotating the second filter screen is provided at the opening of the primary sedimentation tank;

[0015] When the second filter screen rotates, it is used to scrape off impurities on one side of the first filter screen.

[0016] As an optional solution, the top of the secondary evaporation tank is connected in sequence with an air outlet pipe, a transfer tank and a diversion pipe, and the diversion pipe is partially fixed to the outside of the primary sedimentation tank.

[0017] As an optional solution, a transfer liquid pump, an electric valve, and a transfer pipe are connected in sequence between the primary sedimentation tank and the secondary evaporation tank. An external controller connected to the electric valve is installed outside the primary sedimentation tank, and the external controller is electrically connected to the carbon film resistor and the detection circuit.

[0018] As an optional solution, the secondary evaporation pool is vertically installed with a rotating vertical shaft connected to the swirl paddle, a sealed bearing located outside the rotating vertical shaft, and a main drive motor connected to the rotating vertical shaft, and the main drive motor is electrically connected to an external controller.

[0019] As an optional solution, the secondary evaporation pool is provided with a flue gas pipe connected to the flue gas ring duct, and a hanger for hanging the flue gas ring duct is fixed on the top of the flue gas ring duct.

[0020] As an optional solution, the detection circuit includes an external power supply and an external resistor electrically connected to the carbon film resistor sheet, and the external resistor is connected in parallel with a voltmeter connected to the external controller signal.

[0021] As an optional solution, a sealing flange ring and a central convex lens are passed through the top of the secondary evaporation pool, and a hanging buckle that is clamped with the hanging rod is fixed on the top of the sealing flange ring;

[0022] When the reflector reflects the light beam, it is focused by the central convex lens to heat the sewage in the illuminated area.

[0023] A method for purifying wastewater from biologically fermented organic water-soluble fertilizers comprises the following steps:

[0024] Step 1: Filtration treatment: Use a slurry pump to discharge the biological fermentation wastewater into the primary sedimentation tank, where most of the impurities in the wastewater are filtered out. The filtered wastewater is then sent to the secondary evaporation tank, leaving a certain amount of space for evaporation.

[0025] Step 2: Illumination evaporation: When there is sunlight, the sunlight is reflected by the focusing cup to the reflector, and the light beam is concentrated on the central axis of the secondary evaporation pool, heating the sewage, separating water and impurities through evaporation, and allowing the water to escape from the exhaust port of the secondary evaporation pool;

[0026] Step 3: Flue gas evaporation: High-temperature flue gas is supplied to the flue gas loop to heat the sewage. At the same time, the high-temperature flue gas partially overlaps with the light beam action area, so that the heat can be concentrated and the evaporation effect is enhanced;

[0027] Step 4: Status detection: The flue gas pipeline is composed of a flue gas ring and branch pipes, and high-temperature flue gas is ejected at multiple points. The reflector and spoiler divert the high-temperature flue gas, diffusing the flue gas. The steam lifts the spoiler, causing the potential of the carbon film resistor to change, which is used to indicate the evaporation status signal.

[0028] Step 5: Stirring: Rotate the swirl paddle to gather impurities with the centrifugal force of the swirl and accumulate them at the edge of the secondary evaporation pool to avoid clogging the pipeline and lower the water level in the area where light and flue gas act, so as to superimpose high-temperature flue gas and focused light beams;

[0029] Step 6: Steam recovery: The steam from the secondary evaporation tank flows through the primary sedimentation tank, generating a temperature gradient. Under the action of the temperature gradient, the steam heat is partially transferred to the sewage in the primary sedimentation tank for preheating; the steam condenses into tail water, which is then returned to biological fermentation through post-treatment.

[0030] The technical effects achieved by the present invention are:

[0031] The present invention uses high-temperature flue gas and sunlight to simultaneously evaporate sewage, while stirring the sewage. The centrifugal force of the vortex gathers impurities and accumulates them at the edge to avoid clogging the pipeline. The vortex presents a shape with a depression in the middle and a bulge on the periphery, so as to lower the water level in the area where light and flue gas act, making the sewage to be heated per unit time thinner and improving the evaporation efficiency. Since the water level in the middle of the vortex drops, while the high-temperature flue gas is kept sprayed underwater, the light beam refracted by the sewage is reflected above the water surface so as to be concentrated in the high-temperature flue gas heating area. The high-temperature flue gas and the focused light beam can be superimposed in the thin water area, making it easier to generate steam. At the same time, the steam flow will lift the spoiler to indicate the signal of the evaporation status.

[0032] The present invention provides a flexible whip, alloy spikes and a float at the bottom of the reflective sheet, so that the reflective sheet can gather the light beam and carry them to float on the surface of the sewage to clear the foam. The reflective sheet can withstand high temperature environments and is not easily corroded. The flexible whip can be pulled to stay on the surface of the sewage for a long time to continuously clear the foam, and rise and fall synchronously with the water level changes, and can also avoid high-temperature smoke and light beams.

[0033] When sewage evaporates, the present invention forms a flue gas pipeline composed of a flue gas ring and a branch pipe, sprays high-temperature flue gas at multiple points, transfers as much heat as possible to the sewage, and is beneficial to reducing the escape of high-temperature flue gas. In addition, the reflective sheet and the spoiler further divert the high-temperature flue gas and diffuse the flue gas.

[0034] In terms of small-scale sewage treatment, the present invention adopts steps one to six, superimposing high-temperature flue gas and sunlight concentration to quickly evaporate sewage. It can be applied to a sewage treatment capacity of 1.2 t / d, does not require the installation of an additional MVR evaporator, occupies a small area, and stirs the sewage to concentrate precipitation through cyclone to prevent clogging. After evaporation, the precipitate is filter-pressed and sintered into bricks, which kills black soldier fly eggs more thoroughly and is harmless to the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a front view of a wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers in Example 1 of the present invention;

[0036] Figure 2 This is a top view of a wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers in Example 1 of the present invention;

[0037] Figure 3 This is a cross-sectional view of a wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers in Example 1 of the present invention;

[0038] Figure 4 This is a front view of the secondary evaporation pond in Example 1 of the present invention;

[0039] Figure 5 is a schematic diagram of a flue gas pipeline in Example 1 of the present invention;

[0040] Figure 6 This is a front view of the flue gas annular duct in the first embodiment of the present invention;

[0041] Figure 7 This is a front view of the boom in the first embodiment of the present invention;

[0042] Figure 8 This is a front view of the spoiler in the static state in the first embodiment of the present invention;

[0043] Figure 9 This is a front view of the spoiler in the raised state in the first embodiment of the present invention;

[0044] Figure 10 is a side view of the spoiler in the first embodiment of the present invention;

[0045] Figure 11 This is a front view of the flexible whip in Example 1 of the present invention;

[0046] Figure 12 This is a front view of the swirl paddle in the first embodiment of the present invention;

[0047] Figure 13 Schematic diagram of the waste heat recovery pipeline in Example 1 of the present invention;

[0048] Figure 14 is a schematic diagram of the sewage flow direction in the first embodiment of the present invention;

[0049] Figure 15 is a system block diagram of an external controller in embodiment 1 of the present invention;

[0050] Figure 16 The present invention is a flowchart of a wastewater purification method for biological fermentation of organic water-soluble fertilizers in the second embodiment of the present invention.

[0051] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0052] 1. Primary sedimentation tank; 101. Rotating horizontal axis; 102. First filter screen; 103. Second filter screen; 104. Transfer liquid pump; 105. Transfer pipe; 106. Electric valve; 107. External controller; 2. Secondary evaporation tank; 3. Reflector; 4. Focusing cup;

[0053] 5. Flue gas duct; 501. Flue gas pipe; 502. Hanging rod; 6. Branch pipe; 7. Reflector; 8. Spoiler; 9. Carbon film resistor; 10. Swirl paddle; 11. Flexible whip; 12. Alloy spike; 13. Float; 14. Exhaust pipe; 15. Transfer tank; 16. Diverter pipe; 17. Main drive motor; 18. Rotating vertical axis; 19. Sealed bearing; 20. External power supply; 21. External resistor; 22. Voltmeter; 23. Center convex lens; 24. Sealing flange ring; 25. Hanging buckle; 26. Mud discharge window cover; 27. Airtight gasket; 28. Manifold; 29. ​​Auxiliary drive motor. DETAILED DESCRIPTION

[0054] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is described in detail below with reference to the following examples. It should be understood that the following text is only used to describe one or more specific embodiments of the present invention and does not strictly limit the scope of protection of the present invention.

[0055] Chicken manure is a high-quality source of organic fertilizer, rich in nitrogen, phosphorus, potassium and trace elements. However, direct application of untreated chicken manure may cause problems such as excessive salt content, pathogen contamination, and root burn. Through bio-fermentation technology, chicken manure can be converted into safe and efficient organic water-soluble fertilizer, realizing resource utilization and sustainable agricultural development. The main sources of wastewater in the bio-fermentation process of organic water-soluble fertilizer are raw material pretreatment wastewater, fermentation process wastewater, equipment cleaning wastewater, and finished product dilution and packaging wastewater, which urgently need to be treated.

[0056] The main source of chicken manure is the surrounding chicken farms. The daily supply is limited by the scale of chicken farming. The general throughput is 10t / d, and the amount of sewage generated is about 1.2t / d. Therefore, the required sewage treatment scale is relatively small. The present invention is based on a sewage treatment station and carries out small-scale sewage purification and reuse work downstream of the biological fermentation sewage.

[0057] Example 1:

[0058] like Figures 1-15 As shown, a wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers includes a primary sedimentation tank 1 and a secondary evaporation tank 2 which are interconnected. A slurry pump is used to suck the wastewater from the biological fermentation and discharge it into the primary sedimentation tank 1 for primary filtration to collect precipitates with a particle size greater than 0.5 mm. The precipitates are then transported to the secondary evaporation tank 2 for evaporation and cooling before post-treatment for reuse. The precipitates in the wastewater (lumpy black soldier fly eggs and chicken manure) form slurry, which can be sintered into bricks at high temperature after filtration.

[0059] 1. Filtration

[0060] Refer to the attached Figure 1 、 Figure 2 and Figure 3When sewage is discharged into the primary sedimentation tank 1, most of the impurities in the sewage are blocked by the curved first filter 102 because a first filter 102 and a second filter 103 with a pore size of 0.5 mm are arranged inside the primary sedimentation tank 1, and the rotating horizontal axis 101 at the opening of the primary sedimentation tank 1 rotates the second filter 103; when the second filter 103 rotates, it is used to scrape off impurities on one side of the first filter 102 and simultaneously filter impurities in the sewage, reducing the filtration load of the first filter 102.

[0061] Among them, an auxiliary drive motor 29 for driving the rotating horizontal shaft 101 is fixed on the outside of the primary sedimentation tank 1, leaving a certain distance to prevent splashing water and heat insulation. The surfaces of the rotating horizontal shaft 101, the first filter screen 102 and the second filter screen 103 are all coated with anti-rust coating.

[0062] Refer to the attached Figure 1 、 Figure 4 and Figure 15 The filtered sewage in the primary sedimentation tank 1 needs to be sent to the secondary evaporation tank 2. Since the primary sedimentation tank 1 and the secondary evaporation tank 2 are connected in sequence with a transfer liquid pump 104, an electric valve 106, and a transfer pipe 105, an external controller 107 installed outside the primary sedimentation tank 1 can be used to control the electric valve 106 to open, start the transfer liquid pump 104 to suck the sewage, and send it to the secondary evaporation tank 2 along the transfer pipe 105. The secondary evaporation tank 2 is lower than the primary sedimentation tank 1 to prevent sewage backflow. After a certain period of time, the electric valve 106 is controlled to close to avoid the secondary evaporation tank 2 being overfilled, leaving a certain space for evaporation.

[0063] 2. Evaporation treatment

[0064] Refer to the attached Figure 1 、 Figure 3 and Figure 4 When treating wastewater in the secondary evaporation pool 2, this embodiment uses a vertically distributed reflector 3 and a focusing cup 4 fixed above the secondary evaporation pool 2 via an alloy support rod. When sunlight is available, the focusing cup 4 reflects the sunlight to the reflector 3, and the reflector 3 is used to reflect the sunlight into the secondary evaporation pool 2. The light beam is focused on the central axis of the secondary evaporation pool 2, heating the wastewater and separating water and impurities through evaporation, so that the water escapes through the exhaust port of the secondary evaporation pool 2.

[0065] Refer to the attached Figure 2 、 Figure 5 and Figure 14Affected by atmospheric movement, the intensity of sunlight varies. When the light is weak, the evaporation rate approaches zero. Therefore, auxiliary heating is very necessary. In this embodiment, a flue gas loop 5 and a flue gas pipe 501 that are interconnected are provided in the secondary evaporation pool 2. The closed gas furnace is connected to the flue gas pipe 501, and the gas is introduced and ignited by an electronic igniter. High-temperature flue gas is supplied to the flue gas loop 5 along the flue pipe 501. A suspension rod 502 for its suspension is welded on the top of the flue gas loop 5. The flue gas loop 5 can stably spray high-temperature flue gas into the secondary evaporation pool 2 to heat the sewage, separate water and impurities through evaporation, and make the water escape from the exhaust port of the secondary evaporation pool 2.

[0066] As an optional embodiment, the high-temperature flue gas and the light beam action area can partially overlap to concentrate the heat and enhance the evaporation effect, while the exhaust port of the secondary evaporation pool 2 must stagger the light beam, and the steam flow direction avoids the light beam to minimize the light beam refracted by the steam.

[0067] Refer to the attached Figure 5 、 Figure 6 and Figure 10 To expand the flue gas's surface area, this embodiment is equipped with a branch pipe 6, a reflector 7, a spoiler 8, a carbon film resistor 9, and a detection circuit outside the flue gas ring 5. When wastewater evaporates, the flue gas ring 5 and the branch pipe 6 form a flue gas pipeline, which ejects high-temperature flue gas at multiple points, transferring as much heat as possible to the wastewater, thereby reducing the amount of high-temperature flue gas that escapes. Furthermore, the reflector 7 and spoiler 8 further divert and diffuse the high-temperature flue gas. Furthermore, the steam lifts the spoiler 8, causing the potential of the carbon film resistor 9 to change, which is used to indicate the evaporation status.

[0068] Furthermore, the surfaces of the reflector 7 and the spoiler 8 are coated with an anti-stick coating to prevent the adhesion of impurities. The reflector 7 can be made of a high-temperature resistant alloy material, and the spoiler 8 can be made of a fluorosilicone rubber material, which has a certain flexibility and is blown by the steam flow and floats upward, thereby bending the carbon film resistor 9 and causing a change in potential.

[0069] When the spoiler 8 is in a stationary state, see Figure 8 The contact area between the carbon film resistor 9 and the wire is the smallest, and the resistance value connected to the detection circuit is also the smallest, so that the detection circuit captures the static signal, which is used to indicate the absence of steam before evaporation or the end of steam after evaporation, so that the staff can promptly send sewage to the secondary evaporation pool 2 and stop the high-temperature flue gas when the sewage treatment is completed.

[0070] When the spoiler 8 is raised, see Figure 9 The contact area between the carbon film resistor 9 and the wire increases, and the resistance value connected to the detection circuit also increases, so that the action signal is captured by the detection circuit. When it is higher than the threshold, it is used to indicate the progress of evaporation.

[0071] Refer to the attached Figure 8 、 Figure 9 and Figure 11 Since sewage contains impurities, foam will be produced during the evaporation and concentration process. In this embodiment, a flexible whip 11 is welded to the bottom of the reflective sheet 7 and is spaced apart from the spoiler 8. Since the flexible whip 11 is made of nylon, it can withstand high temperature environments. In addition, alloy spikes 12 for puncturing foam are bonded to the outside of the flexible whip 11, which can float on the surface of the sewage to clear the foam. A float 13 is bonded to the end of the flexible whip 11. The float 13 uses a fluorosilicone rubber airbag, which can withstand high temperature environments and is not easily corroded. The flexible whip 11 can be pulled to stay on the surface of the sewage for a long time, can continuously clear foam, and rise and fall synchronously with changes in water level, and can also avoid high-temperature smoke and light beams.

[0072] Refer to the attached Figure 1 、 Figure 13 and Figure 14 To recover steam, in this embodiment, an outlet pipe 14, a transfer tank 15, and a diversion pipe 16 are sequentially connected at the top of the secondary evaporation tank 2 to serve as a waste heat recovery pipeline. During evaporation, the steam and exhaust gas from the secondary evaporation tank 2 flow into the outlet pipe 14 and are dispersed to the diversion pipes 16 at different heights in the transfer tank 15. Since the diversion pipes 16 are partially fixed to the outside of the primary sedimentation tank 1 by bolts, a temperature gradient is generated between the diversion pipes 16 and the primary sedimentation tank 1. Therefore, the steam heat is partially transferred to the sewage in the primary sedimentation tank 1 under the action of the temperature gradient. This part of the heat is recovered and used for preheating in the primary filtration, which can reduce energy consumption during the evaporation process.

[0073] See also Figure 14 After the sewage flows to the secondary evaporation pool 2, the heat is gradually lost through the waste heat recovery pipeline and condensed into tail water, which flows into the neutralization pool through the confluence tube 28 and is concentrated. Lime water is added to adjust the pH to neutral, and then the molecular sieve is used to filter it to clean water before it is reused for biological fermentation.

[0074] Refer to the attached Figure 3 、 Figure 12 and Figure 15 In this embodiment, a swirl paddle 10 is provided in the secondary evaporation pool 2 for stirring the sewage. The secondary evaporation pool 2 is vertically provided with a rotating vertical shaft 18 connected to the swirl paddle 10, a sealed bearing 19 located outside the rotating vertical shaft 18, and a main drive motor 17 connected to the rotating vertical shaft 18. Figure 15 The main drive motor 17 is started by the external controller 107, rotating the vertical rotating shaft 18 and the swirl paddle 10, and the impurities are gathered by the centrifugal force of the swirl and accumulated on the inner edge of the secondary evaporation tank 2 to avoid clogging the pipeline. The swirl presents a shape with a concave center and a convex periphery, which reduces the water level in the area where light and smoke are exposed, making the sewage to be heated thinner per unit time, thereby improving the evaporation efficiency.

[0075] Furthermore, as the water level in the middle of the vortex drops, the branch pipe 6 is kept submerged while the reflector 7, spoiler 8, carbon film resistor 9 and flexible whip 11 are suspended in the air, so that the reflector 7 reflects the light beam refracted by the sewage so as to concentrate it on the high-temperature flue gas heating area, which can superimpose the high-temperature flue gas and the focused light beam in the thin water area, making it easier to generate steam.

[0076] Refer to the attached Figure 5 、 Figure 6 and Figure 7 Since the top of the secondary evaporation pool 2 is penetrated by a sealing flange ring 24 and a central convex lens 23, the light beam emitted by the reflector 3 can be focused by the central convex lens 23 to heat the sewage in the illuminated area. Its energy is concentrated in the flue gas action area to improve the evaporation efficiency. At the same time, since the top of the sealing flange ring 24 is welded with a hanging buckle 25 that is clamped with the hanging rod 502, it is convenient to suspend the flue gas ring 5, the flue gas pipe 501 and the hanging rod 502, and resist the impact of the vortex to maintain a stable state.

[0077] Refer to the attached Figure 15 The detection circuit includes an external power supply 20 and an external resistor 21 electrically connected to the carbon film resistor 9. The external resistor 21 is connected in parallel with a voltmeter 22 connected to the signal of the external controller 107, so that the carbon film resistor 9, the external power supply 20 and the external resistor 21 form a closed loop. Once the resistance of the carbon film resistor 9 changes, it will cause the voltage of the external resistor 21 to change. The signal is detected by the voltmeter 22 and sent to the external controller 107, making it convenient for staff to understand the signal changes in a timely manner in the cloud.

[0078] Refer to the attached Figure 4 After the evaporation is completed, the sewage is cooled to room temperature, and the impurities in the sewage are precipitated in the secondary evaporation pool 2. The mud discharge window cover 26 of the secondary evaporation pool 2 is opened, and the pipe of the slurry pump is passed through the airtight gasket 27. The precipitate is extracted, filtered, and then sintered into bricks to completely kill the black soldier fly eggs.

[0079] Example 2:

[0080] like Figures 1-16 As shown, a method for purifying wastewater from biological fermentation of organic water-soluble fertilizers is applicable to the wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers in Example 1, comprising the following steps:

[0081] Step 1: Filtration: The biological fermentation wastewater is discharged into the primary sedimentation tank 1 using a slurry pump. The auxiliary drive motor 29 drives the rotating horizontal shaft 101, and most of the impurities in the wastewater are blocked by the curved first filter 102. The rotating horizontal shaft 101 at the opening of the primary sedimentation tank 1 rotates the second filter 103. When the second filter 103 rotates, it scrapes impurities on one side of the first filter 102 and simultaneously filters impurities in the wastewater, reducing the filtration load of the first filter 102.

[0082] The filtered sewage in the primary sedimentation tank 1 needs to be sent to the secondary evaporation tank 2. The external controller 107 installed outside the primary sedimentation tank 1 can be used to control the electric valve 106 to open, start the transfer liquid pump 104 to suck the sewage, and send it to the secondary evaporation tank 2 along the transfer pipe 105. The secondary evaporation tank 2 is lower than the primary sedimentation tank 1 to prevent sewage backflow. After a certain period of time, the electric valve 106 is controlled to close to prevent the secondary evaporation tank 2 from being overfilled and to leave a certain space for evaporation.

[0083] Step 2: Illumination evaporation: When sunlight is present, it is reflected by the focusing cup 4 to the reflector 3. The light beam emitted by the reflector 3 can be focused by the central convex lens 23 to heat the sewage in the illuminated area. The light beam is concentrated on the central axis of the secondary evaporation pool 2, heating the sewage and separating the water and impurities through evaporation, so that the water escapes through the exhaust port of the secondary evaporation pool 2.

[0084] Step 3, flue gas evaporation: Affected by atmospheric movement, the intensity of sunlight varies. When the light is weak, the evaporation rate approaches zero. Therefore, auxiliary heating is very necessary. The closed gas furnace is connected to the flue pipe 501, and the gas is ignited by an electronic igniter at the same time. High-temperature flue gas is supplied to the flue gas ring 5 along the flue pipe 501. A suspension rod 502 for its suspension is welded on the top of the flue gas ring 5. The flue gas ring 5 can stably spray high-temperature flue gas into the secondary evaporation pool 2 to heat the sewage, separate water and impurities through evaporation, and make the water escape along the exhaust port of the secondary evaporation pool 2.

[0085] At the same time, the high-temperature flue gas and the light beam action area can partially overlap, so that the heat can be concentrated and the evaporation effect is enhanced. The exhaust port of the secondary evaporation pool 2 must be staggered from the light beam, and the steam flow direction must avoid the light beam to minimize the light beam refracted by the steam.

[0086] Step 4: Status detection: The flue gas pipeline is composed of the flue gas loop 5 and the branch pipe 6. High-temperature flue gas is ejected at multiple points to transfer as much heat as possible to the sewage, which is conducive to reducing the escape of high-temperature flue gas. The reflector 7 and the spoiler 8 further divert the high-temperature flue gas and diffuse the flue gas. The steam lifts the spoiler 8, causing the potential of the carbon film resistor 9 to change, which is used to indicate the evaporation status signal.

[0087] Step 5: Agitation: The external controller 107 controls the main drive motor 17 to start, rotating the vertical shaft 18 and the swirl paddle 10. The centrifugal force of the swirl gathers impurities and deposits them on the inner edge of the secondary evaporation tank 2 to avoid clogging the pipeline. The swirl has a concave center and a convex periphery to reduce the water level in the area where light and smoke are exposed, making the wastewater to be heated thinner per unit time and improving evaporation efficiency.

[0088] Furthermore, as the water level in the middle of the swirl drops, the branch pipe 6 remains submerged while the reflector 7, spoiler 8, carbon film resistor 9 and flexible whip 11 are suspended in the air. This allows the reflector 7 to reflect the light beam refracted by the sewage so that it is concentrated on the high-temperature flue gas heating area. This allows the high-temperature flue gas and the focused light beam to be superimposed on the thin water area, making it easier to generate steam.

[0089] Step 6: Steam Recovery: The steam and tail gas from the secondary evaporation tank 2 flow to the outlet pipe 14 and are dispersed in the transfer tank 15 to the diversion pipes 16 at different heights, creating a temperature gradient between the diversion pipes 16 and the primary sedimentation tank 1. Therefore, due to the temperature gradient, the steam heat is partially transferred to the sewage in the primary sedimentation tank 1. This heat is recovered and used for preheating in the primary filtration process, thereby reducing energy consumption during the evaporation process.

[0090] The steam passes through the waste heat recovery pipeline, and the heat is gradually lost and condensed into tail water. It is concentrated in the neutralization tank, and lime water is added to adjust the pH to neutral. It is then filtered through molecular sieves to obtain clean water before being reused for biological fermentation.

[0091] After evaporation is completed, the sewage is cooled to room temperature and impurities are precipitated in the secondary evaporation pool 2. The mud discharge window cover 26 of the secondary evaporation pool 2 is opened, and the slurry pump pipe is passed through the airtight gasket 27. The precipitate is extracted, filtered and sintered into bricks to completely kill the black soldier fly eggs.

[0092] In summary, in small-scale sewage treatment, steps one to six are adopted, and high-temperature flue gas and sunlight are concentrated to quickly evaporate sewage. This can be applied to a sewage treatment capacity of 1.2t / d. There is no need to set up an additional MVR evaporator, which occupies a small area. In addition, the sewage is stirred and concentrated by cyclone to prevent blockage. After evaporation, the precipitate is filtered and sintered into bricks, which kills the black soldier fly eggs more thoroughly and is harmless to the environment.

[0093] The foregoing merely represents optional embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizers, comprising a primary sedimentation tank (1) and a secondary evaporation tank (2) connected to each other, characterized in that: The secondary evaporation pool (2) is provided with: A reflector (3) and a focusing cup (4) are vertically distributed in sequence, wherein the reflector (3) is used to reflect sunlight into the secondary evaporation pool (2); A flue gas ring duct (5) is used to evaporate the sewage in the secondary evaporation pool (2) through flue gas, and a branch pipe (6), a reflective sheet (7), a spoiler (8), a carbon film resistor (9) and a detection circuit are provided on the outside of the flue gas ring duct (5); A swirl paddle (10) stirs the sewage, gathers impurities with the centrifugal force of the swirl, avoids clogging, and lowers the water level in the area where light and smoke act; When sewage evaporates, smoke is diffused through the spoiler (8), and steam lifts the spoiler (8), causing the potential of the carbon film resistor (9) to change, which is used to indicate a signal of the evaporation state.

2. The sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 1, characterized in that: A flexible whip (11) spaced apart from the spoiler (8) is fixed to the bottom of the reflective sheet (7), an alloy spike (12) for puncturing foam is fixed to the outside of the flexible whip (11), and a float (13) is fixed to the end of the flexible whip (11).

3. The sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 1, characterized in that: A first filter screen (102) and a second filter screen (103) are provided inside the primary sedimentation tank (1), and a rotating horizontal axis (101) for rotating the second filter screen (103) is provided at the opening of the primary sedimentation tank (1); When the second filter screen (103) rotates, it is used to scrape off impurities on one side of the first filter screen (102).

4. The sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 1, characterized in that: The top of the secondary evaporation tank (2) is sequentially connected with an air outlet pipe (14), a transfer tank (15) and a diversion pipe (16), and the diversion pipe (16) is partially fixed to the outside of the primary sedimentation tank (1).

5. The sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 1, characterized in that: A transfer liquid pump (104), an electric valve (106), and a transfer pipe (105) are sequentially connected between the primary sedimentation tank (1) and the secondary evaporation tank (2). An external controller (107) connected to the electric valve (106) is installed outside the primary sedimentation tank (1). The external controller (107) is electrically connected to the carbon film resistor (9) and the detection circuit.

6. The wastewater purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 5, characterized in that: The secondary evaporation pool (2) is vertically installed with a rotating vertical shaft (18) connected to the swirl paddle (10), a sealed bearing (19) located outside the rotating vertical shaft (18), and a main drive motor (17) connected to the rotating vertical shaft (18), wherein the main drive motor (17) is electrically connected to an external controller (107).

7. The wastewater purification and reuse device for a biological fermentation organic water-soluble fertilizer according to claim 1, characterized in that: The secondary evaporation pool (2) is provided with a flue gas pipe (501) in communication with the flue gas ring duct (5), and a suspension rod (502) for suspending the flue gas ring duct (5) is fixed on the top of the flue gas ring duct (5).

8. The wastewater purification and reuse device for bio-fermentation organic water-soluble fertilizer according to claim 5, characterized in that: The detection circuit comprises an external power supply (20) and an external resistor (21) electrically connected to the carbon film resistor (9); the external resistor (21) is connected in parallel to a voltmeter (22) signal-connected to the external controller (107).

9. The wastewater purification and reuse device for bio-fermentation organic water-soluble fertilizer according to claim 7, characterized in that: A sealing flange ring (24) and a central convex lens (23) are passed through the top of the secondary evaporation pool (2); a hanging buckle (25) that is engaged with the hanging rod (502) is fixed to the top of the sealing flange ring (24); When the reflector (3) reflects the light beam, it is focused by the central convex lens (23) to heat the sewage in the illuminated area.

10. A method for purifying wastewater from a bio-fermented organic water-soluble fertilizer, applied to a wastewater purification and reuse device for a bio-fermented organic water-soluble fertilizer according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Filtration treatment: Use a slurry pump to discharge the bio-fermentation wastewater into the primary sedimentation tank (1), where most of the impurities in the wastewater are filtered out. The filtered wastewater is then sent to the secondary evaporation tank (2), leaving a certain amount of space for evaporation. Step 2: Illumination evaporation: When there is sunlight, the sunlight is reflected by the focusing cup (4) to the reflector (3), and the light beam is focused on the central axis of the secondary evaporation pool (2), heating the sewage, separating the water and impurities through evaporation, and allowing the water to escape along the exhaust port of the secondary evaporation pool (2); Step 3, flue gas evaporation: supply high-temperature flue gas to the flue gas loop (5) to heat the sewage. At the same time, the high-temperature flue gas partially overlaps with the light beam action area, so that the heat can be concentrated and the evaporation effect is enhanced. Step 4, status detection: The flue gas pipeline is composed of a flue gas ring duct (5) and a branch pipe (6), and high-temperature flue gas is ejected at multiple points. The reflector (7) and the spoiler (8) divert the high-temperature flue gas and diffuse the flue gas. The steam lifts the spoiler (8), causing the potential of the carbon film resistor (9) to change, which is used to indicate the signal of the evaporation status. Step 5, stirring treatment: rotating the swirl paddle (10) to gather impurities with the centrifugal force of the swirl and accumulate them on the inner edge of the secondary evaporation pool (2) to avoid clogging the pipeline and lowering the water level in the area where light and flue gas act, so as to superimpose high-temperature flue gas and focused light beam; Step 6, steam recovery: The steam from the secondary evaporation tank (2) flows through the primary sedimentation tank (1), generating a temperature gradient. Under the action of the temperature gradient, the steam heat is partially transferred to the sewage in the primary sedimentation tank (1) for preheating; the steam condenses into tail water, which is then recycled for bio-fermentation through post-treatment.

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