Sewage purifying and recycling device for biological fermentation of organic water-soluble fertilizer and purifying method of sewage purifying and recycling device

Abstract

The invention belongs to the technical field of organic water-soluble fertilizer production sewage treatment, and particularly relates to a sewage purifying and recycling device for biological fermentation of organic water-soluble fertilizer and a purifying method thereof.The device comprises a primary sedimentation tank and a secondary evaporation tank which are communicated with each other, and the secondary evaporation tank is provided with a reflective mirror, a light gathering cup, a flue gas loop and a rotational flow paddle; the reflector is used for reflecting sunlight into the second-stage evaporation pond, sewage in the second-stage evaporation pond is evaporated through flue gas, a branch pipe, a reflector, a spoiler, a carbon film resistor disc and a detection circuit are arranged outside the flue gas annular channel, the rotational flow paddle stirs the sewage, impurities are gathered through centrifugal force of rotational flow, blockage is avoided, and the water level of an illumination and flue gas acting area is reduced; the method comprises steps 1-6. The middle water level is lowered through stirring rotational flow, high-temperature flue gas and focused light beams can be stacked in a thin water area, sediment is gathered at the edge to prevent blockage, and meanwhile steam flow can raise spoilers to indicate signals of the evaporation state.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment for the production of water-soluble organic fertilizers, and specifically relates to a sewage purification and reuse device for biologically fermented water-soluble organic 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 water-soluble organic fertilizers after fermentation. After fermentation, small molecule organic acids, amino acids, humic acids, etc. are generated, and the water solubility is more than 95%, which can be quickly absorbed by crops; the main sewage sources in the biological fermentation process of water-soluble organic fertilizers are raw material pretreatment sewage, fermentation process sewage, equipment cleaning sewage, and finished product dilution and packaging sewage; the purification methods of these sewage include filtration method, flocculation precipitation method, high-temperature concentration method, etc. After retrieval, there are the following related technologies:

[0003] 1. For example, a sewage treatment device and method for the production of organic fertilizers disclosed in Chinese invention patent with publication number CN118479578B can clean the organic fertilizers and sundries intercepted on the filter screen to avoid blocking the filter holes after filtering impurities with a filter screen.

[0004] 2. For example, a zero-emission system and method for treating high-concentration organic industrial sewage disclosed in Chinese invention patent with publication number CN115893750A uses an MVR evaporator to evaporate and concentrate the sewage, and the evaporation crystallization concentrate after MVR evaporation of the concentrated water generated in the reverse osmosis process for deep treatment is used in the blending and dehumidifying and slag-removing section.

[0005] In summary, for the sewage treatment in the production of water-soluble organic fertilizers, which contains blocky black soldier fly eggs and chicken manure, and part of it penetrates the filter screen. In addition, when it is introduced into the MVR evaporator, it is easy to scale and cause blockage. Therefore, the present invention proposes a sewage purification and reuse device for biologically fermented water-soluble organic fertilizers that uses high-temperature flue gas and solar energy concentration evaporation to avoid blockage, and a sewage purification method for such water-soluble organic fertilizers. Summary of the Invention

[0006] The purpose of the present invention is to provide a sewage purification and reuse device for biologically fermented water-soluble organic fertilizers and a purification method thereof, which can reduce the intermediate water level by stirring and swirling, can stack high-temperature flue gas and focused light beams in the thin water area, prevent blockage by aggregating precipitation at the edge, and at the same time, the steam flow will lift the spoiler to indicate the evaporation state signal.

[0007] The technical solution adopted by the present invention is specifically as follows:

[0008] A sewage purification and reuse device for biologically fermented water-soluble organic fertilizers includes a primary sedimentation tank and a secondary evaporation tank that are interconnected. The secondary evaporation tank is provided with:

[0009] A reflecting mirror and a condenser cup vertically distributed in sequence. The reflecting mirror is used to reflect sunlight into the secondary evaporation tank;

[0010] The flue gas loop evaporates the sewage in the secondary evaporation tank through the flue gas. A branch pipe, a reflective sheet, a spoiler, a carbon film resistor and a detection circuit are arranged outside the flue gas loop;

[0011] The swirl paddle stirs the sewage to gather impurities by the centrifugal force of the swirl, avoiding blockage and reducing the water level in the area affected by light and flue gas;

[0012] When the sewage evaporates, the flue gas is diffused by the spoiler, and the steam raises the spoiler, causing a change in the potential of the carbon film resistor, which is used to indicate the signal of the evaporation state.

[0013] As an alternative, a flexible whip spaced from the spoiler is fixed to the bottom of the reflective sheet. Alloy spikes for piercing foam are fixed to the outside of the flexible whip, and a floating member is fixed to the end of the flexible whip.

[0014] As an alternative, a first filter screen and a second filter screen are arranged at intervals inside the primary sedimentation tank, and a rotating horizontal shaft for rotating the second filter screen is arranged at the opening of the primary sedimentation tank;

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

[0016] As an alternative, an air outlet pipe, a transfer tank and a shunt pipe are sequentially connected to the top of the secondary evaporation tank, and a part of the shunt pipe is fixed outside the primary sedimentation tank.

[0017] As an alternative, a transfer liquid pump, an electric valve and a transfer pipe are sequentially connected 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 alternative, a rotating vertical shaft connected to the swirl paddle, a sealing bearing located outside the rotating vertical shaft, and a main drive motor connected to the rotating vertical shaft are sequentially installed vertically in the secondary evaporation tank, and the main drive motor is electrically connected to the external controller.

[0019] As an alternative, the secondary evaporation tank is provided with a flue gas pipe communicating with the flue gas loop, and a suspension rod for hanging it is fixed to the top of the flue gas loop.

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

[0021] As an alternative, a sealing flange ring and a central convex lens penetrate through the top of the secondary evaporation pond, and a hanging buckle clamped with the suspension 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 sewage of a biological fermentation organic water-soluble fertilizer comprises the following steps:

[0024] Step 1, filtration treatment: Using a slurry pump to discharge the biological fermentation sewage into a primary sedimentation pond, most of the impurities in the sewage are filtered, and the filtered sewage is sent to a secondary evaporation pond, leaving a certain space for evaporation;

[0025] Step 2, light evaporation: When there is sunlight, the sunlight is reflected by a condenser cup to a reflector, and the light beam is concentrated on the central axis of the secondary evaporation pond to heat the sewage. Through the evaporation effect, the water and impurities are separated, and the water is separated from the exhaust port of the secondary evaporation pond;

[0026] Step 3, flue gas evaporation: Supplying high-temperature flue gas to a flue gas loop to heat the sewage. At the same time, the high-temperature flue gas partially overlaps with the area where the light beam acts, so that the heat can be concentrated and the evaporation effect can be strengthened;

[0027] Step 4, state detection: A flue gas pipeline composed of a flue gas loop and a branch pipe sprays high-temperature flue gas at multiple points, and the reflector and the spoiler split the high-temperature flue gas to diffuse the flue gas. And the steam raises the spoiler, causing a potential change in the carbon film resistor for indicating the evaporation state signal;

[0028] Step 5, stirring treatment: Rotating the swirl paddle to gather impurities by the centrifugal force of the swirl, piling up at the inner edge of the secondary evaporation pond to avoid blocking the pipeline, and reducing the water level in the area where the light and the flue gas act for superimposing the high-temperature flue gas and the focused light beam;

[0029] Step 6, steam recovery: The steam of the secondary evaporation pond flows through the primary sedimentation pond to generate a temperature gradient. Under the action of the temperature gradient, part of the steam heat is transferred to the sewage in the primary sedimentation pond for preheating; the steam is condensed into tail water and reused for biological fermentation after post-treatment.

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

[0031] The present invention synchronously evaporates sewage by means of high-temperature flue gas and sunlight concentration, while stirring the sewage, and aggregates impurities by the centrifugal force of the swirl flow, which accumulates at the edge to avoid clogging the pipeline. The swirl flow presents a shape with a sunken middle and a raised periphery, so as to reduce the water level in the area affected by light and flue gas, making the sewage to be heated thinner per unit time, and improving the evaporation efficiency. Since the water level in the middle of the swirl flow drops, while maintaining the ejection of high-temperature flue gas 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, enabling the superposition of high-temperature flue gas and focused light beam in the thin water area, making it easier to generate steam. At the same time, the steam flow will lift the spoiler, indicating the signal of the evaporation state.

[0032] The present invention is provided with a flexible whip, alloy spikes and a floating piece at the bottom of the reflector, so that while the reflector gathers the light beam, it can carry them to float on the water surface of the sewage to clear the foam, can withstand the high-temperature environment, is not easily corroded, can pull the flexible whip to be in the water surface of the sewage for a long time, can continuously clear the foam, and can rise and fall synchronously with the water level change, and can also avoid high-temperature flue gas and light beam.

[0033] When the sewage is evaporated in the present invention, the flue gas pipeline composed of a flue gas ring channel and a branch pipe ejects high-temperature flue gas at multiple points, transferring as much heat as possible to the sewage, which is beneficial to reducing the escaped high-temperature flue gas, and the reflector and the spoiler further shunt the high-temperature flue gas to diffuse the flue gas.

[0034] In the aspect 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, can be applicable to a sewage treatment capacity of 1.2 t / d, does not require additional installation of an MVR evaporator, has a small floor area, and stirs the sewage, and concentrates and precipitates through the swirl flow method to prevent clogging; after evaporation, the precipitate is pressure-filtered and sintered into bricks, which can thoroughly kill the black soldier fly eggs and is harmless to the environment. Description of the Drawings

[0035] Figure 1 is the front view of a sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer in Embodiment 1 of the present invention;

[0036] Figure 2 is the top view of a sewage purification and reuse device for a biological fermentation organic water-soluble fertilizer in Embodiment 1 of the present invention;

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

[0038] Figure 4 is the front view of the secondary evaporation tank in Embodiment 1 of the present invention;

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

[0040] Figure 6 It is the front view of the flue gas loop in the first embodiment of the present invention;

[0041] Figure 7 It is the front view of the suspension rod in the first embodiment of the present invention;

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

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

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

[0045] Figure 11 It is the front view of the flexible whip in the first embodiment of the present invention;

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

[0047] Figure 13 It is the schematic diagram of the waste heat recovery pipeline in the first embodiment of the present invention;

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

[0049] Figure 15 It is the system block diagram of the external controller in the first embodiment of the present invention;

[0050] Figure 16 It is the flow chart of a sewage purification method for a biological fermentation organic water-soluble fertilizer in the second embodiment of the present invention.

[0051] In the drawings, the list of components represented by each reference numeral is 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. Condensing cup;

[0053] 5. Flue gas loop; 501. Flue gas pipe; 502. Suspension rod; 6. Branch pipe; 7. Reflective sheet; 8. Turbulence sheet; 9. Carbon film resistor; 10. Swirl paddle; 11. Flexible whip; 12. Alloy spike; 13. Floating piece; 14. Exhaust pipe; 15. Transfer tank; 16. Diverging pipe; 17. Main drive motor; 18. Rotating vertical shaft; 19. Sealing bearing; 20. External power supply; 21. External resistor; 22. Voltmeter; 23. Middle convex lens; 24. Sealing flange ring; 25. Suspension buckle; 26. Mud discharge window cover; 27. Airtight gasket; 28. Converging cylinder; 29. Sub-drive motor. Detailed implementation mode

[0054] In order to make the purpose and advantages of the present invention more clear, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation modes of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0055] Chicken manure is a high-quality organic fertilizer source, rich in nitrogen, phosphorus, potassium and medium and trace elements. However, direct application of untreated chicken manure may have problems such as excessive salt content, pathogen pollution, and root burning. Through biological 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 sewage in the biological fermentation process of organic water-soluble fertilizer are raw material pretreatment sewage, fermentation process sewage, equipment cleaning sewage, and finished product dilution and packaging sewage, which urgently need to be treated.

[0056] The source of chicken manure is mainly from surrounding chicken farms. The daily supply is limited by the scale of chicken farming. Generally, the throughput is 10 t / d, and the amount of sewage generated is about 1.2 t / d. In this way, the required sewage treatment scale is small. Based on the sewage treatment station, small-scale sewage purification and reuse work is carried out downstream of the sewage in biological fermentation.

[0057] Example 1:

[0058] As Figures 1 - 15 shown, a sewage purification and reuse device for biological fermentation of organic water-soluble fertilizer includes a primary sedimentation tank 1 and a secondary evaporation tank 2 that are interconnected. The sewage in biological fermentation is sucked by a slurry pump and discharged into the primary sedimentation tank 1 for primary filtration. The sediment with a particle size greater than 0.5 mm is collected and then transported to the secondary evaporation tank 2 to evaporate the sewage. After cooling, it is reused after post-treatment. The sediment of the sewage (blocky black soldier fly eggs and chicken manure) forms mud, which can be sintered into bricks at high temperature after pressure filtration.

[0059] I. Filtration treatment

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

[0061] Among them, a secondary drive motor 29 for driving the rotating horizontal shaft 101 is fixed outside the primary sedimentation tank 1, leaving a certain distance to prevent water splashing and heat insulation. Anti-rust coatings are provided on the surfaces of the rotating horizontal shaft 101, the first filter screen 102, and the second filter screen 103.

[0062] Refer to the appendix 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 a transfer liquid pump 104, an electric valve 106, and a transfer pipe 105 are connected in sequence between the primary sedimentation tank 1 and the secondary evaporation tank 2, the external controller 107 installed outside the primary sedimentation tank 1 can be used to control the opening of the electric valve 106, start the transfer liquid pump 104 to suck the sewage, and send it into the secondary evaporation tank 2 along the transfer pipe 105. Among them, 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 overfilling of the secondary evaporation tank 2 and leave a certain space for evaporation.

[0063] II. Evaporation treatment

[0064] Refer to the appendix Figure 1 、 Figure 3 and Figure 4 , when treating sewage in the secondary evaporation tank 2, in this embodiment, the reflecting mirrors 3 and the condenser cups 4 distributed vertically in sequence are fixed above the secondary evaporation tank 2 through alloy support rods. When there is sunlight, the sunlight is reflected to the reflecting mirror 3 through the condenser cup 4, and the reflecting mirror 3 is used to reflect the sunlight into the secondary evaporation tank 2. The light beam is concentrated on the central axis of the secondary evaporation tank 2 to heat the sewage, and the water and impurities are separated through the evaporation effect, so that the water escapes along the exhaust port of the secondary evaporation tank 2.

[0065] Refer to the appendix Figure 2 、 Figure 5 and Figure 14, affected by atmospheric movement, the sunlight intensity 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 communicate with each other are provided in the secondary evaporation tank 2. The closed gas furnace is connected to the flue gas pipe 501. While introducing gas, it is ignited by an electronic igniter. High-temperature flue gas is supplied to the flue gas loop 5 along the flue gas pipe 501. Also, a suspension rod 502 for hanging it is welded to the top of the flue gas loop 5. On one hand, the flue gas loop 5 can stably spray high-temperature flue gas into the secondary evaporation tank 2 to heat the sewage. Through the evaporation effect, water and impurities are separated, and the water escapes along the exhaust port of the secondary evaporation tank 2.

[0066] As an optional embodiment, the area where the high-temperature flue gas acts on the light beam can be partially overlapped, so that the heat can be concentrated and the evaporation effect can be strengthened. However, the exhaust port of the secondary evaporation tank 2 must be staggered from the light beam, and the steam flow direction avoids the light beam as much as possible to reduce the light beam refracted by the steam.

[0067] Refer to the appendix Figure 5 、 Figure 6 and Figure 10 , in order to expand the action surface of the flue gas, in this embodiment, a branch pipe 6, a reflector 7, a spoiler 8, a carbon film resistor 9 and a detection circuit are provided outside the flue gas loop 5. When the sewage evaporates, a flue gas pipeline is formed by the flue gas loop 5 and the branch pipe 6, and high-temperature flue gas is ejected from multiple points to transfer as much heat as possible to the sewage, which is beneficial to reducing the escaped high-temperature flue gas. Moreover, the reflector 7 and the spoiler 8 further divert the high-temperature flue gas and diffuse the flue gas. And the steam raises the spoiler 8, causing a potential change in the carbon film resistor 9, which is used as a signal indicating the evaporation state;

[0068] Furthermore, anti-sticking coatings are applied to the surfaces of both the reflector 7 and the spoiler 8 to avoid adhering 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, thus bending the carbon film resistor 9 and causing a potential change.

[0069] In the stationary state of the spoiler 8, refer to 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. Thus, a stationary signal is captured by the detection circuit, which is used to indicate the situation without steam before evaporation or the end of steam after evaporation, so that the staff can timely feed sewage into the secondary evaporation tank 2 and stop the high-temperature flue gas when the sewage treatment is completed.

[0070] In the raised state of the spoiler 8, refer to 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. Thus, an action signal is captured by the detection circuit. When it is higher than the threshold, it is used to indicate the situation of ongoing evaporation.

[0071] Referring to the attached Figure 8 、 Figure 9 and Figure 11 , since the sewage contains impurities, foam will be produced during the evaporation and concentration process. In this embodiment, a flexible whip 11 spaced from the spoiler 8 is welded to the bottom of the reflector 7. Since the flexible whip 11 is made of nylon material, it can withstand high-temperature environments. In addition, alloy spikes 12 for piercing the foam are bonded to the outside of the flexible whip 11, which can float on the water surface of the sewage to clear the foam. A floating member 13 is bonded to the end of the flexible whip 11. The floating member 13 made of a fluorosilicone rubber airbag can withstand high-temperature environments, is not easily corroded, can pull the flexible whip 11 to stay on the water surface of the sewage for a long time, can continuously clean the foam, and can rise and fall synchronously with the water level change, and can also avoid high-temperature flue gas and light beams.

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

[0073] See Figure 14 , after the sewage flows into the secondary evaporation tank 2, through the waste heat recovery pipeline, the heat gradually dissipates and condenses into tail water, which flows into the neutralization tank through the confluence cylinder 28, is adjusted to neutral pH by adding lime water, and then filtered to clean water by using molecular sieves before being reused for biological fermentation.

[0074] Referring to the attached Figure 3 、 Figure 12 and Figure 15 , in this embodiment, a swirl paddle 10 is arranged in the secondary evaporation tank 2 for stirring the sewage. Since a rotating vertical shaft 18 connected to the swirl paddle 10, a sealing bearing 19 located outside the rotating vertical shaft 18, and a main drive motor 17 connected to the rotating vertical shaft 18 are sequentially installed vertically in the secondary evaporation tank 2. See Figure 15 , by controlling the main drive motor 17 to start through the external controller 107, the rotating vertical shaft 18 and the swirl paddle 10 are rotated to gather impurities by the centrifugal force of the swirl and accumulate at the inner edge of the secondary evaporation tank 2 to avoid blocking the pipeline. The swirl presents a shape with a concave middle and a raised periphery to reduce the water level in the area affected by light and flue gas, making the sewage to be heated thinner per unit time, which can improve the evaporation efficiency;

[0075] Furthermore, as the intermediate water level of the swirling flow drops, while keeping the branch pipe 6 submerged, the reflector 7, the spoiler 8, the carbon film resistor 9, and the flexible whip 11 are suspended, enabling the reflector 7 to reflect the light beam refracted by the sewage so as to concentrate it on the high-temperature flue gas heating area, allowing the thin water area to superimpose the high-temperature flue gas and the focused light beam, and making it easier to generate steam.

[0076] Refer to the appendix Figure 5 、 Figure 6 and Figure 7 As shown in the figure, since the top of the secondary evaporation tank 2 is penetrated by the sealing flange ring 24 and the middle convex lens 23, the light beam emitted by the reflector 3 can be focused by the middle convex lens 23 to heat the sewage in the illumination area, and its energy is concentrated on 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 buckle 25 that is clamped with the suspension rod 502, it is convenient for the flue gas duct 5, the flue gas pipe 501, and the suspension rod 502 to be suspended, and to resist the impact of the swirling flow and maintain a stable state.

[0077] Refer to the appendix Figure 15 As shown in the figure, the detection circuit includes an external power supply 20 and an external resistor 21 that are electrically connected to the carbon film resistor 9. The external resistor 21 is connected in parallel with a voltmeter 22 that is signal-connected to 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 a voltage change in the external resistor 21, which is detected by the voltmeter 22 and the signal is sent to the external controller 107, facilitating the staff to timely understand the signal change in the cloud.

[0078] Refer to the appendix Figure 4 As shown in the figure, after evaporation is completed and cooled to room temperature, the sewage impurities form a precipitate in the secondary evaporation tank 2. Open the sludge discharge window cover 26 of the secondary evaporation tank 2, pass the pipeline of the slurry pump through the airtight gasket 27, extract the precipitate, and sinter it into bricks after pressure filtration to completely kill the black soldier fly eggs.

[0079] Embodiment 2:

[0080] As Figures 1 - 16 shown, a method for purifying sewage of a biological fermentation organic water-soluble fertilizer, which is applicable to the sewage purification and reuse device of the biological fermentation organic water-soluble fertilizer in Embodiment 1, includes the following steps:

[0081] Step 1, filtration treatment: the biological fermentation wastewater is discharged into the primary sedimentation tank 1 by a slurry pump, and the rotating horizontal axis 101 is driven by the auxiliary driving motor 29, and most of the impurities in the wastewater are blocked by the first curved filter screen 102, and the rotating horizontal axis 101 at the opening of the primary sedimentation tank 1 rotates the second filter screen 103; when the second filter screen 103 rotates, it is used to scrape off the impurities on one side of the first filter screen 102, and simultaneously filter the impurities in the wastewater, thereby reducing the filtering load of the first filter screen 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, and the transfer liquid pump 104 is started 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 the sewage from flowing back. After a certain period of time, the electric valve 106 is controlled to close to avoid the secondary evaporation tank 2 from being overfilled, leaving a certain space for evaporation;

[0083] Step 2, light evaporation: When there is sunlight, the sunlight is reflected to the reflector 3 through the focusing cup 4, and 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 to heat the sewage, separate the water and impurities through evaporation, and make the water escape along the exhaust port of the secondary evaporation pool 2;

[0084] Step 3, flue gas evaporation: Affected by atmospheric movement, the intensity of sunlight changes. 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 while it is introduced. 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 can be enhanced, while the exhaust port of the secondary evaporation pool 2 must be staggered from the light beam, and the steam flow direction avoids the light beam, so as to reduce the light beam refracted by the steam as much as possible;

[0086] Step 4, status detection: The flue gas pipeline is composed of the flue gas ring 5 and the branch pipe 6, and high-temperature flue gas is sprayed out 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, and the reflector 7 and the spoiler 8 further divert the high-temperature flue gas, diffuse the flue gas, and the steam lifts the spoiler 8, causing the potential change of the carbon film resistor 9, which is used to indicate the signal of the evaporation status;

[0087] Step 5. Stirring treatment: The main drive motor 17 is started by the external controller 107 to rotate the rotary vertical shaft 18 and the swirl paddle 10, so as to gather impurities by the centrifugal force of the swirl and accumulate them on the inner edge of the secondary evaporation tank 2, avoiding clogging the pipeline. The swirl presents a shape with a sunken middle and a raised periphery, so as to lower the water level in the area affected by light and flue gas, making the sewage to be heated thinner per unit time, and improving the evaporation efficiency.

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

[0089] Step 6. Steam recovery: The steam and tail gas of the secondary evaporation tank 2 flow to the outlet pipe 14 and are dispersed into the shunt pipes 16 with different heights in the transfer tank 15, so that a temperature gradient is generated between the shunt pipe 16 and the primary sedimentation tank 1. Therefore, part of the steam heat is transferred to the sewage in the primary sedimentation tank 1 under the action of the temperature gradient, and this part of the heat is recovered and used for preheating in the primary filtration, which can reduce the energy consumption during the evaporation process.

[0090] The steam flows through the waste heat recovery pipeline, and the heat gradually dissipates and condenses into tail water, which is concentrated through the neutralization tank, the pH is adjusted to neutral by adding lime water, and then filtered through the molecular sieve to clean water before being reused for biological fermentation.

[0091] After evaporation, it is cooled to room temperature, and the sewage impurities form precipitation in the secondary evaporation tank 2. The sludge discharge window cover 26 of the secondary evaporation tank 2 is opened, the pipeline of the slurry pump is passed through the airtight gasket 27, and the precipitation is extracted and sintered into bricks after pressure filtration, so as to completely kill the black soldier fly eggs.

[0092] In summary, in small-scale sewage treatment, Steps 1 to 6 are adopted, and high-temperature flue gas and sunlight are superimposed and concentrated to quickly evaporate sewage, which can be applied to a sewage treatment volume of 1.2 t / d. There is no need to additionally install an MVR evaporator, the floor area is small, and the sewage is stirred and concentrated and precipitated by swirling to prevent blockage. After evaporation, the precipitation is pressure-filtered and sintered into bricks, which can completely kill the black soldier fly eggs and is harmless to the environment.

[0093] The above is only an optional implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention are implemented according to the conventional means in the art without special description and limitation.

Claims

1. A wastewater purification and reuse device for biological fermentation of organic water-soluble fertilizer, 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 arranged in sequence vertically, 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 sheet (8), a carbon film resistor sheet (9) and a detection circuit are arranged outside the flue gas ring duct (5); A cyclone paddle (10), wherein the cyclone paddle (10) stirs the sewage, gathers impurities by the centrifugal force of the cyclone, 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 up 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 of a biological fermentation organic water-soluble fertilizer according to claim 1 is characterized in that: A flexible whip (11) spaced apart from the spoiler (8) is fixed at the bottom of the reflective sheet (7), an alloy spike (12) for piercing foam is fixed on the outside of the flexible whip (11), and a floating member (13) is fixed at the end of the flexible whip (11).

3. The sewage purification and reuse device of a biological fermentation organic water-soluble fertilizer according to claim 1 is characterized in that: A first filter screen (102) and a second filter screen (103) are arranged at intervals inside the primary sedimentation tank (1), and a rotating horizontal axis (101) for rotating the second filter screen (103) is arranged 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 wastewater purification and reuse device of 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 a portion of the diversion pipe (16) is fixed to the outside of the primary sedimentation tank (1).

5. The wastewater purification and reuse device of a biological fermentation organic water-soluble fertilizer according to claim 1 is 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); and 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 biological fermentation organic water-soluble fertilizer according to claim 5, characterized in that: 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), wherein the main drive motor (17) is electrically connected to an external controller (107).

7. The wastewater purification and reuse device of 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) connected to 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 biological fermentation organic water-soluble fertilizer according to claim 5, characterized in that: The detection circuit comprises an external power source (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 biological 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 clamped 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 biologically fermented organic water-soluble fertilizer, applied to a wastewater purification and reuse device for a biologically fermented organic water-soluble fertilizer as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Filtration treatment: The biological fermentation wastewater is discharged into the primary sedimentation tank (1) by using a slurry pump, and 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 space for evaporation; Step 2, light evaporation: when there is sunlight, the sunlight is reflected to the reflector (3) through the focusing cup (4), 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 making the water escape along the exhaust port of the secondary evaporation pool (2); Step 3, flue gas evaporation: high-temperature flue gas is supplied 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, state detection: a flue gas pipeline is formed by a flue gas ring (5) and a branch pipe (6), high-temperature flue gas is sprayed out at multiple points, and a reflector (7) and a spoiler (8) divert the high-temperature flue gas, diffuse the flue gas, and 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 state; Step 5: stirring: rotating the swirl paddle (10) to gather impurities with the centrifugal force of the swirl and deposit 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 smoke act, so as to superimpose high-temperature smoke and focused light beams; 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 heat of the steam is partially transferred to the sewage in the primary sedimentation tank (1) for preheating; the steam is condensed into tail water, which is then recycled for biological fermentation through post-treatment.

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