Low-concentration ammonia-nitrogen wastewater treatment and recycling system

Abstract

The utility model provides a low-concentration ammonia-nitrogen wastewater treatment and recycling system which comprises a low-concentration ammonia-nitrogen wastewater pool, and a water pump, wastewater reaction main equipment and a water outlet which are sequentially communicated with the low-concentration ammonia-nitrogen wastewater pool, and is characterized in that the wastewater reaction main equipment comprises an electromagnetic valve, a reaction device, an ammonia-nitrogen detection sensor and a check valve which are sequentially communicated through a pipeline; the other end of the electromagnetic valve is communicated with a water pump, the other end of the check valve is communicated with a water outlet, the reaction device comprises an upper purification regeneration tank and a lower sedimentation tank, the purification regeneration tank is filled with zeolite and used for purifying low-concentration ammonia nitrogen wastewater, and the sedimentation tank is used for reacting high-concentration ammonia nitrogen desorption liquid. According to the low-concentration ammonia-nitrogen wastewater treatment and recycling system, the low-concentration ammonia-nitrogen wastewater is economically, safely and effectively purified at low carbon, and meanwhile, the characteristics of cyclic regeneration of zeolite and recycling of zeolite desorption liquid are realized.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and specifically to a low-concentration ammonia nitrogen wastewater treatment and resource utilization system. Background Art

[0002] Ammonia-nitrogen wastewater, a major source of water pollution, poses a significant environmental threat. Discharged without proper treatment can severely disrupt the ecological balance of water bodies. It can also trigger eutrophication, leading to algae blooms that deplete dissolved oxygen, deteriorate water quality, and harm aquatic life. To address this issue, researchers have developed a variety of treatment methods designed to effectively remove ammonia-nitrogen wastewater. These methods can be broadly categorized as biological, physical, and chemical.

[0003] Biological methods mainly include traditional activated sludge method, nitrification and denitrification, and new activated sludge method; physical methods mainly include stripping method, adsorption method and membrane separation method; chemical methods mainly include chemical precipitation method, breakpoint chlorination method and capacitive deionization technology. The above methods have achieved certain results in treating ammonia nitrogen wastewater, but they still have their own shortcomings: the biological activity in the biological process is affected by many factors such as ambient temperature and wastewater quality; the conversion of liquid ammonia nitrogen into gas in the stripping method of the physical method will cause secondary pollution problems; the ion exchange capacity of the zeolite in the adsorption method of the physical method will continue to decrease after saturation of ammonia nitrogen, affecting the wastewater treatment effect; the chemical method requires the addition of a large amount of chemical agents, is relatively costly, and has limited effect on the treatment of low-concentration ammonia nitrogen wastewater, and has certain limitations.

[0004] Therefore, it is particularly important to propose an efficient, low-cost and environmentally friendly low-concentration ammonia nitrogen wastewater treatment and resource utilization system. While purifying low-concentration ammonia nitrogen wastewater economically, low-carbon, safely and effectively, it also realizes the characteristics of zeolite recycling and zeolite desorption liquid resource reuse. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a low-concentration ammonia nitrogen wastewater treatment and resource recovery system for efficient, economical and environmentally friendly low-concentration ammonia nitrogen wastewater treatment. In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The utility model discloses a low-concentration ammonia nitrogen wastewater treatment and resource utilization system, comprising a low-concentration ammonia nitrogen wastewater pool, a water pump, a wastewater reaction main device and a water outlet connected thereto in sequence, wherein the wastewater reaction main device comprises a solenoid valve, a reaction device, an ammonia nitrogen detection sensor and a check valve connected in sequence through pipelines, the other end of the solenoid valve is connected to the water pump, and the other end of the check valve is connected to the water outlet, the reaction device comprises an upper purification and regeneration pool and a lower sedimentation pool, the purification and regeneration pool is filled with zeolite for purifying low-concentration ammonia nitrogen wastewater, and the sedimentation tank is used for reacting high-concentration ammonia nitrogen desorption liquid.

[0007] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions: the purification and regeneration tank and the sedimentation tank are connected up and down through a gate valve, the purification and regeneration tank is cylindrical, and the sedimentation tank is cylindrical at the top and funnel-shaped at the bottom.

[0008] As an optimal technical solution of the present invention, the side wall of the purification and regeneration tank 12 is provided with a wastewater inlet and a clean water outlet, the wastewater inlet is lower than the clean water outlet, and the top of the purification and regeneration tank is provided with a valved injection port 1, the valved injection port 1 is used to inject regeneration liquid, and the regeneration liquid is used for zeolite regeneration.

[0009] As an optimal technical solution of the present utility model, the top of the sedimentation tank is provided with a second injection port with a valve, and the second injection port with a valve is used to inject a precipitant. A drain outlet is provided near the bottom of the side wall of the sedimentation tank, and a filter is provided at the connecting port between the drain outlet and the side wall. A valve is provided at the water outlet position of the drain outlet, and a sediment outlet is provided at the bottom of the sedimentation tank.

[0010] As an optimal technical solution of the present invention, a central axis is provided in the sedimentation tank, and a radial cleaning bracket is provided along the circumferential outer wall of the central axis. The contact surface between the cleaning bracket and the inner wall of the sedimentation tank is provided with bristles, and the bristles abut the inner wall of the sedimentation tank. The cleaning bracket rotates around the central axis.

[0011] As a preferred technical solution of the present invention, the gate valve is a ball valve, which includes a sphere and a valve seat. The sphere and the valve seat are respectively provided with aligned through holes. When the sphere rotates, it cooperates with the valve seat to form communication and sealing.

[0012] As an optimal technical solution of the present utility model, the wastewater treatment and resource utilization system also includes a linkage controller, which is respectively connected to the solenoid valve, reaction device, and ammonia nitrogen detection sensor of the wastewater reaction main equipment. The linkage controller opens and closes the solenoid valve of the wastewater reaction main equipment through the feedback value of the ammonia nitrogen detection sensor of the wastewater reaction main equipment. The linkage controller can also control the cleaning bracket of the wastewater reaction main equipment to start or stop rotation through the motor.

[0013] As an optimal technical solution of the present utility model, the wastewater treatment and resource utilization system also includes a wastewater reaction standby equipment, which also includes a solenoid valve, a reaction device, an ammonia nitrogen detection sensor and a check valve connected in sequence through pipelines. The other end of the solenoid valve of the wastewater reaction standby equipment is connected to a water pump, and the other end of the check valve of the wastewater reaction standby equipment is connected to a water outlet. The wastewater reaction main equipment, the wastewater reaction standby equipment and the linkage controller constitute a wastewater treatment and resource utilization unit, and the linkage controller realizes automatic start, stop and switching operations of the wastewater reaction main equipment and the wastewater reaction standby equipment.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] The device of the present utility model not only restores the adsorption performance of zeolite, making it recyclable, but also realizes the deep removal and purification of ammonia nitrogen in wastewater, while recovering ammonia nitrogen resources, realizing the effective utilization of resources and dual protection of the environment. The device can cleverly separate and increase the ammonia nitrogen concentration in low-concentration ammonia nitrogen wastewater, so that low-concentration ammonia nitrogen wastewater that was originally difficult to participate in fertilizer synthesis can also successfully react with the precipitant to obtain valuable fertilizer. This precipitation process realizes resource recycling in the wastewater treatment process of this system, effectively reduces or eliminates the generation of ammonia nitrogen regeneration waste liquid, avoids secondary wastewater pollution caused by zeolite desorption liquid, reduces the load of the wastewater treatment system, and realizes the resource utilization of low-concentration ammonia nitrogen wastewater.

[0016] This low-concentration ammonia nitrogen wastewater treatment and resource recovery system utilizes a linkage control connection relationship in which the main and backup equipment operate alternately. The linkage controller monitors the ammonia nitrogen concentration in real time and automatically switches between the main and backup wastewater reaction equipment, ensuring the continuity and stability of the wastewater treatment effect. This alternating main and backup operation mode allows the wastewater treatment system to maintain good treatment performance over long periods of operation, saving the regeneration time required to wait for the zeolite to lose its adsorption capacity.

[0017] The device of the utility model has high efficiency in treating low-concentration ammonia nitrogen wastewater and is easy to operate. It can work efficiently and continuously, and also reduces the environmental pollution of ammonia nitrogen in the wastewater, while promoting resource reuse. This system not only has significant environmental benefits, but also has broad market application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the main wastewater reaction equipment of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the wastewater reaction main equipment and wastewater reaction backup equipment of the utility model;

[0021] Figure 3 This is a schematic diagram of the wastewater treatment path of the wastewater reaction main equipment and the wastewater reaction backup equipment of the utility model;

[0022] Figure 4 The structure of the reaction device of the utility model is shown as follows Figure 1 ;

[0023] Figure 5 The structure of the reaction device of the utility model is shown as follows Figure 2 ;

[0024] Figure 6 This is a schematic diagram of the bristle structure on the cleaning bracket of the sedimentation tank;

[0025] Figure 7 It is a structural diagram of the gate valve of the reaction device and its internal valve core;

[0026] In the figure: low-concentration ammonia nitrogen wastewater pool 1; water pump 2; wastewater treatment and resource recovery unit 3; wastewater reaction main equipment 4; wastewater reaction backup equipment 5; solenoid valve 6; reaction device 7; ammonia nitrogen detection sensor 8; check valve 9; water outlet 10; linkage controller 11; purification and regeneration pool 12; sedimentation tank 13; wastewater inlet 14; valved injection port 16; clean water outlet 15; gate valve 17; valved injection port 2 18; sediment outlet 19; drain outlet 20; valve 21; cleaning bracket 22; brush 23; filter 24. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] like Figure 1As shown, the present invention discloses a low-concentration ammonia nitrogen wastewater treatment and resource recovery system, comprising a low-concentration ammonia nitrogen wastewater pool 1, a water pump 2, a wastewater reaction main unit 4, and a water outlet 10, which are sequentially connected thereto. The low-concentration ammonia nitrogen wastewater pool 1 is used to collect low-concentration ammonia nitrogen wastewater to be treated, and the water pump 2 is used to transport the wastewater from the pool to the wastewater reaction main unit 4. The wastewater reaction main unit 4 includes a solenoid valve 6, a reaction unit 7, an ammonia nitrogen detection sensor 8, and a check valve 9, which are sequentially connected by pipelines. The other end of the solenoid valve 6 is connected to the water pump 2 and controls the passage of wastewater to the main unit. The ammonia nitrogen detection sensor 8 is used to monitor the ammonia nitrogen content in the wastewater in real time to prevent the discharge of wastewater that does not meet the standards. The check valve 9 prevents the backflow of purified water that meets the standards. The other end of the check valve 9 is connected to the water outlet 10.

[0030] like Figure 4 As shown, the reaction device 7 includes an upper purification and regeneration tank 12 and a lower sedimentation tank 13. The purification and regeneration tank 12 is filled with zeolite for purifying low-concentration ammonia nitrogen wastewater. The sedimentation tank 13 is used to react with high-concentration ammonia nitrogen desorption liquid. The sedimentation tank 13 is placed below the purification and regeneration tank 12. The entire reaction device 7 has the characteristics of small footprint and green recyclability. The purification and regeneration tank 12 and the sedimentation tank 13 are connected up and down through a gate valve 17 to ensure that the high-concentration ammonia nitrogen desorption liquid enters the sedimentation tank 13. The purification and regeneration tank 12 is cylindrical, and the sedimentation tank 13 is cylindrical at the top and funnel-shaped at the bottom. This structure with a large top and a small bottom is conducive to the order in which the sediment first reacts and then naturally sinks. The funnel shape at the bottom is conducive to the waste sediment sliding into the outlet through the slope of the funnel, which is convenient for discharging the sediment and ensuring the cleanliness and efficient operation of the sedimentation tank 13.

[0031] The sidewalls of the purification and regeneration tank 12 are provided with a wastewater inlet 14 and a clean water outlet 15. Wastewater enters through the wastewater inlet 14, and purified water is discharged from the clean water outlet 15. The wastewater inlet 14 is lower than the clean water outlet 15. This high-low design helps the wastewater overcome gravity and slowly rise upward to fully contact the zeolite, making the purification process more efficient. It also ensures that the purified water can flow out smoothly, avoiding mixing of wastewater and purified water. The top of the purification and regeneration tank 12 is provided with a valved injection port 16. The valved injection port 16 is used to inject regeneration liquid, which is a sodium chloride liquid, to achieve zeolite regeneration and restore the zeolite's adsorption properties.

[0032] The purification and regeneration tank 12 of the reaction device 7 is densely filled with zeolite to maximize its contact area with the liquid. The full contact between the zeolite surface area and the maximum volume of the low-concentration ammonia nitrogen wastewater can efficiently purify the wastewater. The full contact between the zeolite surface area and the maximum volume of the regeneration liquid can also effectively regenerate the adsorption-saturated zeolite, ensuring that the zeolite is fully regenerated and improving the purification and regeneration efficiency. The zeolite is natural zeolite with a particle size of 20 to 40 mesh. Natural zeolite has high adsorption performance and can effectively remove ammonia nitrogen substances in water. The purification and regeneration tank 12 can efficiently purify wastewater or add regeneration liquid to regenerate the adsorption-saturated zeolite, ensuring the continuous and stable operation of the zeolite adsorption and purification of wastewater, and obtaining a desorption liquid with a high concentration of ammonia nitrogen. This device has high efficiency in treating low-concentration ammonia nitrogen wastewater, is easy to operate and has low operating costs. The valved injection port 16 of the purification regeneration tank 12 can be used to add regeneration liquid, which not only restores the adsorption performance of the zeolite and enables it to be recycled, but also achieves deep removal and purification of ammonia nitrogen in the wastewater, while recovering ammonia nitrogen resources, achieving effective resource utilization and dual protection of the environment.

[0033] like Figure 4 As shown, the top of the sedimentation tank 13 is provided with a valved injection port 2 18, the valved injection port 2 18 is used to inject a precipitant, which is magnesium chloride and disodium hydrogen phosphate, to promote the precipitation of high-concentration ammonia nitrogen desorption liquid. A drain port (20) is provided near the bottom of the sedimentation tank 13 side wall. The location of the drain port (20) close to the bottom of the sedimentation tank 13 is conducive to draining the precipitation solution. The drain port 20 and the side wall communication port are provided with a filter screen 24 to facilitate filtering out the precipitate and smoothly falling into the bottom of the sedimentation tank 13. The outlet position of the drain port 20 is provided with a valve (21), which can be opened or closed to control the resource recycling work. The bottom end of the sedimentation tank 13 is provided with a sediment outlet (19). The side wall of the sedimentation tank 13 is provided with a drain port 20, and the lower end is provided with a sediment outlet 19, which are used to discharge the sediment respectively. The valved injection port 2 18 is far away from the sediment outlet 19 and the drain port 20, which is conducive to the full reaction of the precipitant and the high-concentration ammonia nitrogen desorption liquid. This precipitation process realizes resource reuse in the wastewater treatment process of this system, effectively reduces or eliminates the generation of ammonia nitrogen regeneration waste liquid, effectively avoids secondary wastewater pollution caused by zeolite regeneration, reduces the load of the wastewater treatment system, and realizes resource utilization of low-concentration ammonia nitrogen wastewater.

[0034] like Figure 5-6As shown, the sedimentation tank 13 is provided with a central axis, and a radial cleaning bracket is provided along the outer circumference of the central axis. The cleaning bracket rotates around the central axis. The rotation of the cleaning bracket generates an annular flow that can fully stir the high-concentration ammonia nitrogen desorption liquid and the precipitant, thereby accelerating the mixing reaction of the precipitant and the high-concentration ammonia nitrogen desorption liquid. The contact surface between the cleaning bracket and the inner wall of the sedimentation tank 13 is provided with bristles 23, and the bristles 23 abut the inner wall of the sedimentation tank 13. The sedimentation tank 13 with magnesium chloride and disodium hydrogen phosphate as precipitants is prone to accumulation of sediment and easily forms dirt on the inner wall of the sedimentation tank 13. The cleaning bracket 22 rotates around the central axis, thereby driving the bristles 23 to scrape and clean the dirt on the wall and bottom of the sedimentation tank 13.

[0035] like Figure 7 As shown, the gate valve 17 is a ball valve, which includes a sphere and a valve seat. The sphere and the valve seat are respectively provided with aligned through holes. When the sphere rotates, it cooperates with the valve seat to form a connection and seal to prevent medium leakage, thereby completing the on-off of the pipeline. As a commonly used fluid accessory, the ball valve is simple and fast to operate, and has good sealing performance, which effectively prevents leakage.

[0036] like Figure 1 As shown, the wastewater treatment and resource utilization system also includes a linkage controller 11, which is respectively connected to the solenoid valve 6, the reaction device 7, and the ammonia nitrogen detection sensor 8 of the wastewater reaction main equipment 4. The linkage controller 11 controls the opening and closing of the solenoid valve 6 of the wastewater reaction main equipment through the feedback value of the ammonia nitrogen detection sensor 8 of the wastewater reaction main equipment 4, and can also control the rotation opening and stopping of the cleaning bracket of the wastewater reaction main equipment through the motor.

[0037] It should be noted that low-concentration ammonia nitrogen wastewater has a low reaction efficiency with the precipitant due to its low ammonia nitrogen content, and may even fail to generate a reaction. In order to overcome this limitation, the purification and regeneration tank 12 introduces a reaction system of zeolite and sodium chloride regeneration liquid. This method can cleverly separate and increase the ammonia nitrogen concentration in the wastewater, thereby making it difficult for low-concentration ammonia nitrogen wastewater that was originally difficult to participate in fertilizer synthesis. After treatment and purification, the ammonia nitrogen in the wastewater is separated and converted into a high-concentration ammonia nitrogen desorption liquid, which can directly react with magnesium chloride and disodium hydrogen phosphate and be efficiently converted into fertilizer. The utility model can cleverly separate and increase the ammonia nitrogen concentration in the low-concentration ammonia nitrogen wastewater through the low-concentration ammonia nitrogen wastewater treatment and resource utilization system, thereby making it difficult for low-concentration ammonia nitrogen wastewater that was originally difficult to participate in fertilizer synthesis. It can also successfully react with the precipitant to obtain valuable fertilizer, effectively solving the problem of the difficulty of treating low-concentration ammonia nitrogen wastewater, broadening the application scope of wastewater treatment, and providing strong support for the realization of resource recycling.

[0038] Example 2

[0039] On the basis of Example 1, Figure 2-3As shown, the wastewater treatment and resource utilization system also includes a wastewater reaction standby equipment 5, which also includes a solenoid valve 6, a reaction device 7, and an ammonia nitrogen detection sensor 8 connected in sequence through pipelines. The other end of the solenoid valve 6 of the wastewater reaction standby equipment 5 is connected to the water pump 2, and the other end of the check valve 9 of the wastewater reaction standby equipment 5 is connected to the water outlet 10. The wastewater reaction main equipment 4, the wastewater reaction standby equipment 5 and the linkage controller 11 constitute a wastewater treatment and resource utilization unit 3, wherein the two solenoid valves 6 and the two ammonia nitrogen detection sensors 8 are respectively connected to the linkage controller 11, and the linkage controller 11 controls the opening and closing of the solenoid valve 6 by receiving the feedback value of the ammonia nitrogen detection sensor 8, thereby realizing the automatic start, stop and switching operation of the wastewater reaction main equipment 4 and the wastewater reaction standby equipment 5, wherein the feedback value is the real-time content of ammonia nitrogen in the purified water during the operation of the system. When the linkage controller 11 receives feedback from the ammonia nitrogen sensor 8 that the ammonia nitrogen content in the purified water is greater than the standard, indicating that the adsorption capacity of one set of wastewater reaction equipment is not up to standard, the linkage controller 11 closes the solenoid valve 6 of the corresponding equipment and opens the other set of wastewater reaction equipment to purify the wastewater, thereby ensuring the continuity and reliability of the purification function. This active and standby alternating operation mode allows the wastewater treatment system to maintain excellent treatment performance during long-term operation, saving the regeneration time after the zeolite loses its adsorption capacity.

[0040] like Figure 3 As shown, the utility model low concentration ammonia nitrogen wastewater treatment process:

[0041] During low-concentration ammonia nitrogen wastewater operation, the wastewater is transported to the wastewater treatment and resource recycling unit via water pump 2. The main wastewater reaction device 4 and the standby wastewater reaction device 5 operate alternately. The linkage controller 11 activates the wastewater purification operation of the main wastewater reaction device 4. The valved inlet 16 and gate valve 17 in the main wastewater reaction device 4 are both closed. The solenoid valve 6 of the main wastewater reaction device 4 is opened. The water pump 2 transports the low-concentration ammonia nitrogen wastewater from the low-concentration ammonia nitrogen wastewater tank 1 to the reaction device 7. The purified wastewater is tested by the ammonia nitrogen detection sensor 8 and then transported to the outlet 10 through the check valve 9. When the ammonia nitrogen detection sensor 8 detects that the ammonia nitrogen concentration feedback value after purification of the main wastewater reaction device 4 is greater than the standard ammonia nitrogen content of the purified water, the information is transmitted to the linkage controller 11. Upon receiving this feedback value, the linkage controller 11 automatically closes the solenoid valve 6 of the main wastewater reaction device 4, thereby cutting off the purification operation of the main wastewater reaction device 4. At the same time, the linkage controller 11 starts the wastewater purification work of the wastewater reaction standby equipment 5, the linkage controller 11 automatically opens the solenoid valve 6 of the wastewater reaction standby equipment 5, the valved injection port 16 and the gate valve 17 of the wastewater reaction standby equipment 5 are both closed, and the water pump 2 sends the low-concentration ammonia nitrogen wastewater from the low-concentration ammonia nitrogen wastewater pool 1 to the reaction device 7. The purified wastewater is detected by the ammonia nitrogen detection sensor 8 and then sent to the water outlet 10 through the check valve 9. When the ammonia nitrogen detection sensor 8 detects that the feedback value of the ammonia nitrogen concentration after purification of the wastewater reaction standby equipment 5 is greater than the standard ammonia nitrogen content of the purified water, the information is transmitted to the linkage controller 11. After obtaining the feedback value, the linkage controller 11 automatically closes the solenoid valve 6 of the wastewater reaction standby equipment 5, thereby cutting off the purification work of the wastewater reaction standby equipment 5. The wastewater reaction main equipment 4 and the wastewater reaction standby equipment 5 are repeatedly operated alternately to ensure continuous and stable wastewater treatment.

[0042] Zeolite regeneration and resource reuse work, when the wastewater reaction standby equipment 5 is performing wastewater purification treatment, the wastewater reaction main equipment 4 is performing zeolite regeneration and resource reuse, and the specific working steps of the wastewater reaction main equipment 4 are as follows: the solenoid valve 6 and the gate valve 17 in the wastewater reaction main equipment 4 are closed, the valve injection port 16 is opened, and sodium chloride regeneration liquid is injected into the valve injection port 16. The sodium chloride regeneration liquid adopts 1mol / L NaCl solution, and the regeneration time is 24 hours. After the reaction is completed, the gate valve 17 is opened to allow the high-concentration ammonia nitrogen sodium chloride regeneration liquid in the purification regeneration tank 12 to enter the sedimentation tank 13, close the sediment outlet 19 and the valve 21, open the valve injection port 2 18, and start resource reuse work. Magnesium chloride and disodium hydrogen phosphate precipitant are injected through the valve injection port 2 18. The amount of magnesium chloride and disodium hydrogen phosphate precipitant is obtained by on-site proportioning according to the ammonia nitrogen concentration of the high-concentration ammonia nitrogen desorption liquid. The control proportion standard is The reaction formula is The reaction time is 24 hours. The generated magnesium ammonium phosphate (MgNH4PO4) can be used as a slow-release fertilizer and discharged through the sediment outlet 19. Opening valve 21 to discharge the precipitated solution can end the resource recycling work. When the wastewater reaction main equipment 4 is performing wastewater purification treatment, the wastewater reaction standby equipment 5 is performing zeolite regeneration and resource recycling. The working steps of the wastewater reaction standby equipment 5 are the same as the zeolite regeneration and resource recycling work flow of the wastewater reaction main equipment 4, and will not be repeated. This cycle ensures that the ammonia nitrogen in the wastewater is effectively treated and resource reused.

[0043] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0044] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A low-concentration ammonia nitrogen wastewater treatment and resource recovery system, comprising a low-concentration ammonia nitrogen wastewater pool (1), a water pump (2), a wastewater reaction main device (4) and a water outlet (10) connected thereto in sequence, characterized in that: The wastewater reaction main equipment (4) comprises a solenoid valve (6), a reaction device (7), an ammonia nitrogen detection sensor (8) and a check valve (9) which are sequentially connected through a pipeline. The other end of the solenoid valve (6) is connected to the water pump (2), and the other end of the check valve (9) is connected to the water outlet (10). The reaction device (7) comprises an upper purification and regeneration tank (12) and a lower sedimentation tank (13). The purification and regeneration tank (12) is filled with zeolite for purifying low-concentration ammonia nitrogen wastewater, and the sedimentation tank (13) is used for reacting high-concentration ammonia nitrogen desorption liquid.

2. The low-concentration ammonia nitrogen wastewater treatment and resource utilization system according to claim 1, characterized in that: The purification and regeneration tank (12) and the sedimentation tank (13) are connected up and down through a gate valve (17). The purification and regeneration tank (12) is cylindrical, and the sedimentation tank (13) is cylindrical in the upper part and funnel-shaped in the lower part.

3. The low-concentration ammonia nitrogen wastewater treatment and resource utilization system according to claim 2, characterized in that: The side wall of the purification regeneration tank (12) is provided with a wastewater inlet (14) and a clean water outlet (15), wherein the wastewater inlet (14) is lower than the clean water outlet (15), and the top of the purification regeneration tank (12) is provided with a valved injection port (16), wherein the valved injection port (16) is used to inject regeneration liquid, and the regeneration liquid is used for zeolite regeneration.

4. The low-concentration ammonia nitrogen wastewater treatment and resource recovery system according to claim 2, characterized in that: The top of the sedimentation tank (13) is provided with a second injection port (18) with a valve, and the second injection port (18) with a valve is used to inject a precipitant. A drain port (20) is provided near the bottom of the side wall of the sedimentation tank (13), a filter screen (24) is provided between the drain port (20) and the side wall communication port, a valve (21) is provided at the water outlet position of the drain port (20), and a sediment outlet (19) is provided at the bottom of the sedimentation tank.

5. The low-concentration ammonia nitrogen wastewater treatment and resource utilization system according to claim 4, characterized in that: A central axis is provided in the sedimentation tank (13), and a radial cleaning bracket (22) is provided along the circumferential outer wall of the central axis. Brushes (23) are provided on the contact surface between the cleaning bracket (22) and the inner wall of the sedimentation tank (13). The brushes (23) abut against the inner wall of the sedimentation tank (13), and the cleaning bracket (22) rotates circumferentially around the central axis.

6. The low-concentration ammonia nitrogen wastewater treatment and resource recovery system according to any one of claims 2 to 5, characterized in that: The gate valve (17) is a ball valve, comprising a sphere and a valve seat, wherein the sphere and the valve seat are respectively provided with aligned through holes, and when the sphere rotates, it cooperates with the valve seat to form communication and sealing.

7. The low-concentration ammonia nitrogen wastewater treatment and resource utilization system according to claim 6, characterized in that: The wastewater treatment and resource utilization system further comprises a linkage controller (11), wherein the linkage controller (11) is respectively connected to the electromagnetic valve (6), the reaction device (7), and the ammonia nitrogen detection sensor (8) of the wastewater reaction main equipment (4). The linkage controller (11) opens and closes the electromagnetic valve (6) of the wastewater reaction main equipment (4) based on the feedback value of the ammonia nitrogen detection sensor (8) of the wastewater reaction main equipment (4). The linkage controller (11) can also control the cleaning bracket (22) of the wastewater reaction main equipment (4) to start or stop rotation through a motor.

8. The low-concentration ammonia nitrogen wastewater treatment and resource recovery system according to claim 7, characterized in that: The wastewater treatment and resource utilization system further comprises a wastewater reaction standby device (5), which also comprises a solenoid valve (6), a reaction device (7), an ammonia nitrogen detection sensor (8) and a check valve (9) which are sequentially connected through a pipeline. The other end of the solenoid valve (6) of the wastewater reaction standby device (5) is connected to the water pump (2), and the other end of the check valve (9) of the wastewater reaction standby device (5) is connected to the water outlet (10). The wastewater reaction main device (4), the wastewater reaction standby device (5) and the linkage controller (11) constitute a wastewater treatment and resource utilization unit (3), and the linkage controller (11) realizes automatic start, stop and switching operations of the wastewater reaction main device (4) and the wastewater reaction standby device (5).

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