Livestock and poultry breeding wastewater MAP precipitation treatment and recovery device

Abstract

The utility model discloses a livestock and poultry breeding wastewater MAP precipitation treatment recovery device, which comprises a device main body, a water inlet system, a reaction system, a solid-liquid separation system, a drainage system and an electric control system are arranged on the device main body, the water inlet system comprises a water inlet pipe, a medicament pipe and a shunt pipe, and the water inlet pipe and the medicament pipe are respectively connected with the reaction system through the shunt pipe. The reaction system comprises two electrode plate groups, a mixing area is arranged between the two electrode plate groups, and the shunt pipe is communicated with the mixing area at the water outlet end. The water inlet system further comprises an outer circulating pipe and a pipeline pump, the outer circulating pipe and the pipeline pump of the water inlet system conduct backflow, liquid circulation in the reaction system is completed, and the mixing effect is improved. The solid-liquid separation system comprises a filter frame suspension and a filter screen, the filter frame suspension is detachably connected to the device body, a filter frame outlet and a sealing cover plate are arranged on the lower side of the device body, and collection of sediment products and cleaning of the filter screen are facilitated. The device is simple in structure and low in operation energy consumption.

Description

Technical field:

[0001] The invention belongs to the technical field of livestock and poultry breeding wastewater treatment, and relates to a treatment and recovery device for nitrogen-phosphorus-containing wastewater, in particular to a MAP precipitation treatment and recovery device for livestock and poultry breeding wastewater. Background technology:

[0002] High concentrations of nitrogen and phosphorus are the primary pollutants in livestock and poultry wastewater. Although essential nutrients for plant and animal growth, the discharge of livestock and poultry wastewater into water bodies can lead to excessive nitrogen and phosphorus levels, causing eutrophication and deteriorating water quality in the area, making it difficult to repair itself.

[0003] MAP (Magnesium Ammonium Phosphate), also known as magnesium ammonium phosphate crystallization method or struvite crystallization method, can efficiently recover ammonia nitrogen and phosphate from livestock and poultry wastewater. The mechanism of MAP process for nitrogen and phosphorus removal is that when Mg in solution 2+ NH4 + PO4 3- When the mass concentration product of the ion is greater than the solubility product constant Ksp (Ksp = 13.26), magnesium ammonium phosphate (MgNH4PO4·6H2O) will be spontaneously generated and precipitated to achieve NH4 + PO4 3- Remove at the same time. The MAP reaction formula is:

[0004] Mg 2+ +PO4 3- +NH4 + +6H2O→MgNH4PO4·6H2O↓

[0005] The reaction product, struvite crystals, is a high-quality slow-release nitrogen and phosphorus fertilizer that minimizes nutrient loss and is less prone to seedling burn. Its slightly soluble nature prevents eutrophication and makes it suitable for use as a fertilizer for ornamental plants, such as lawns, in river and lake basins. MAP effectively recycles and reuses nitrogen and phosphorus nutrients.

[0006] The traditional MAP process often adds magnesium salts to the wastewater, and at the same time, alkali needs to be added to control the pH during the reaction. However, the concentration of total phosphorus fluctuates greatly when the water enters, making it difficult to control the pH value of the solution. Therefore, the cost is high and the operation is more complicated. Inappropriate dosing ratios will result in poor nitrogen and phosphorus removal effects. For example, excessive use of alkaline compounds will result in low purity of the product struvite, and the morphology of the product struvite is also easily affected by interference factors. The electrochemical MAP precipitation method refers to the use of an electrochemical method, using a magnesium plate as an anode and an inert electrode as a cathode, so that the MAP reaction is carried out in an electrolytic cell consisting of an inert cathode and a magnesium anode (sacrificial anode). The reaction equation is:

[0007] Anode: Mg-2e- →Mg 2+

[0008] Cathode: 2H2O+2e - →H2↑+2OH -

[0009] Through the reduction reaction at the cathode, water molecules decompose into hydrogen and hydroxide ions. Hydroxides increase the pH of the wastewater and maintain it at around 9, eliminating the need to add alkaline compounds to the wastewater to adjust the pH. The oxidation process occurs at the anode, where magnesium ions enter the solution and react with phosphorus and nitrogen in the water to form MAP precipitates. While the structure of MAP treatment units varies significantly in actual production, the system characteristics are generally complex. Stirring and mixing are required during the reaction, and MAP sludge cannot be completely discharged after aggregation. The sedimentation screen is difficult to clean after one or several settling periods. Struvite that is not discharged or cleaned in a timely manner can deposit and scale on the screen, preventing the discharge of newly generated products and affecting the normal operation of the long-term MAP precipitation treatment and recovery equipment.

[0010] It should be noted that the above content falls within the technical knowledge of the inventor and does not necessarily constitute prior art. Summary of the invention:

[0011] The purpose of the present invention is to provide a MAP precipitation treatment and recovery device for livestock and poultry breeding wastewater to solve the technical problem of recycling nitrogen and phosphorus resources in livestock and poultry breeding wastewater. At the same time, the MAP precipitation treatment and recovery device has a simple structure, small footprint, low cost investment, low operating energy consumption, and easy product collection.

[0012] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater, comprising a device main body, on which a water inlet system, a reaction system, a solid-liquid separation system, a drainage system and an electronic control system are arranged. The water inlet system comprises a water inlet pipe, a chemical pipe and a diversion pipe, and the water inlet pipe and the chemical pipe are respectively connected to the reaction system via a diversion pipe. The reaction system comprises two electrode plate groups, each electrode plate group comprises a plurality of anode plates and cathode plates arranged at intervals and crosses, and a mixing zone is arranged between the two electrode plate groups in the reaction system, and the diversion pipe is connected to the mixing zone at the water outlet end.

[0013] Preferably, the diversion pipe includes two diversion branches, which are arranged in parallel and staggered, one of which is connected to the water inlet pipe, and the other is connected to the medicine pipe.

[0014] Preferably, the anode plate and cathode plate in the reaction system are respectively fixed in the device body through plate clamping slots.

[0015] Preferably, the anode plate is a magnesium or magnesium alloy plate, the cathode plate is a stainless steel plate, the spacing between adjacent anode plates and cathode plates in each electrode plate group is 1-3 cm, and the electrode plates opposite to each other on both sides of the mixing zone are electrode plates of different levels in the two electrode plate groups.

[0016] Preferably, the water inlet system also includes an external circulation pipe and a pipeline pump, which are arranged outside the device body, the water inlet end of the external circulation pipe is connected to the lower side of the mixing zone, and the water outlet end of the external circulation pipe is connected to the upper side of the mixing zone.

[0017] Preferably, the electronic control system is arranged on one side of the device body, and a pH meter and an electrode wiring groove are also provided on the device body. The pH meter probe is inserted into the liquid surface of the mixing zone, and the connecting wires of the two electrode plate groups are fixed in the electrode wiring groove. The connecting wires of the pH meter and the connecting wires of the two electrode plate groups are respectively electrically connected to the electronic control system.

[0018] Preferably, the solid-liquid separation system is arranged at the lower part of the device body, and the solid-liquid separation system includes a filter frame suspension and a filter screen. The filter screen is connected to the filter frame suspension, and the filter frame suspension is detachably connected to the device body. A filter frame outlet and a sealing cover plate are provided on the lower side of the device body. A rubber ring groove is provided around the filter frame outlet, and a sealing rubber ring is sleeved on the sealing cover plate. The sealing cover plate is fixed to the device body by bolts and the sealing rubber ring is squeezed into the rubber ring groove.

[0019] Preferably, frame tubes are provided on both sides of the filter frame suspension, the frame tubes are connected to the device body through notched pipe clamps, multiple groups of support rods are vertically inserted between the two frame tubes, and the filter screen is laid on the multiple groups of support rods.

[0020] Preferably, the drainage system is arranged at the bottom of the device body, and the drainage system includes a water collection area, a water outlet pipe and a slag discharge port. The water outlet pipe is connected to the upper side of the water collection area, and the slag discharge port is connected to the bottom of the water collection area.

[0021] Preferably, air holes are provided on the device body.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The utility model relates to a MAP precipitation treatment and recovery device for livestock and poultry breeding wastewater. The reaction system is a membraneless single-chamber electrolysis. The overall size of the device is small. The anode plates and cathode plates are flat-plate-shaped and cross-arranged as mixed layers. The structure can reduce the volume of the electrode chamber but increase the effective working surface of the electrode plate, which is beneficial to improving the ion migration in the device. At the same time, the magnesium anode area is increased, the anode passivation is weakened, and the distance between the anode and the cathode is close, the ion transfer rate between the electrodes is improved, the reaction time is shortened, and the reaction energy consumption is reduced.

[0024] This utility model utilizes a MAP sedimentation treatment and recovery device for livestock and poultry wastewater. The diverter pipe of the water inlet system connects to the mixing zone at the outlet. Two parallel, staggered branch pipes are arranged to introduce wastewater and reagents into the reaction system and mix them in the mixing zone. The external circulation pipe of the water inlet system and a pipeline pump provide backflow, completing the liquid circulation within the reaction system and improving the mixing effect. This eliminates the need for aeration and agitators, effectively removing target pollutants while simplifying the structure and reducing operating costs.

[0025] The utility model relates to a MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater. After sedimentation is completed, the drainage system discharges the sewage from the outlet pipe, and the crystals with smaller particle sizes are discharged from the slag discharge port and then collected. The filter frame suspension and filter screen of the solid-liquid separation system are both detachable, which is convenient for collecting the precipitation product and cleaning the filter screen, and solves the problem of excessive residue and incomplete self-drainage of existing MAP sediment.

[0026] The utility model is provided with a pH meter for the MAP precipitation treatment and recovery device for livestock and poultry breeding wastewater, which can monitor the pH value of the solution in the device in real time and make targeted adjustments to ensure that the pH value of the solution is always within the optimal range of MAP precipitation during the reaction time. Description of the drawings:

[0027] Figure 1 This is a schematic structural diagram of the MAP precipitation treatment and recovery device of this embodiment.

[0028] Figure 2 This is a partial structural diagram of the MAP precipitation treatment and recovery device in this embodiment.

[0029] Figure 3 This is a schematic diagram of the partial structure of the MAP precipitation treatment and recovery device in this embodiment.

[0030] Figure 4 This is a simplified process diagram of the MAP precipitation treatment recovery device in this embodiment.

[0031] Figure markings: 10. Device body, 11. Sealing cover, 12. Filter frame outlet, 13. Rubber ring groove, 14. Air hole, 21. Water inlet pipe, 22. Chemical pipe, 23. First branch pipe, 24. Second branch pipe, 25. External circulation pipe, 26. Pipeline pump, 30. Electronic control system, 31. pH meter, 32. Plate wiring groove, 41. Electrode plate group, 411. Anode plate, 412. Cathode plate, 42. Mixing zone, 43. Plate clamping slot, 51. Frame pipe, 52. Filter screen, 53. Notched pipe clamp, 54. Support rod, 61. Water outlet pipe, 62. Water collection area, 63. Slag discharge port. Specific implementation method:

[0032] The present invention is further described below with reference to the following examples. These examples are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention fall within the scope of protection claimed by the present invention.

[0033] refer to Figure 1 and Figure 2 The present embodiment provides a MAP sedimentation treatment and recovery device for livestock and poultry wastewater, comprising a device body 10, on which a water inlet system, a reaction system, a solid-liquid separation system, a drainage system and an electronic control system 30 are provided. In the present embodiment, the water inlet system comprises a water inlet pipe 21, a chemical pipe 22 and a diversion pipe. The water inlet pipe 21 and the chemical pipe 22 are respectively connected to the reaction system via diversion pipes. The diversion pipe comprises two diversion branches, wherein the first diversion branch 23 is connected to the water inlet pipe 21, and the second diversion branch 24 is connected to the chemical pipe 22. The first diversion branch 23 and the second diversion branch 24 are arranged in parallel and staggered, so that the solutions discharged from the first diversion branch 23 and the second diversion branch 24 can be better mixed. An air hole 14 is provided on the device body 10. Reference Figure 4 The pretreated raw water pipe is connected to a lift pump. The water inlet pipe 21 pumps the pretreated raw water into the device body 10 via the lift pump. The pretreated water here can be wastewater that has undergone ultrafiltration and concentration, followed by an initial pH adjustment. The device of this embodiment can also be combined with other processes for even higher nitrogen and phosphorus removal efficiency.

[0034] refer to Figure 2 The reaction system includes two electrode plate groups 41, each of which includes multiple anode plates 411 and cathode plates 412 arranged in an intersecting manner. In this embodiment, each electrode plate group 41 has a total of 7 plates, one of which has 4 anode plates 411 and 3 cathode plates 412, while the other has 4 cathode plates 412 and 3 anode plates 411. The two electrode plate groups 41 are ensured to be two electrode plates of different levels at opposite locations. A mixing zone 42 is provided between the two electrode plate groups 41, and the outlet ends of the first branch pipe 23 and the second branch pipe 24 are both connected to the mixing zone 42. The upper and lower ends of the anode plates 411 and the cathode plates 412 are respectively fixed in the device body 10 by the plate slots 43, so that the plates in the same electrode plate group 41 remain parallel and equidistant. The spacing between adjacent anode plates 411 and cathode plates 412 within the same electrode plate assembly 41 is 1-3 cm. This reduces reaction energy consumption and shortens the distance ions in the solution travel, shortening reaction time while increasing the MAP reaction rate and leaving ample space for the ions to react. In this embodiment, the anode plates 411 can be made of magnesium or a magnesium alloy, and the cathode plates 412 can be made of stainless steel.

[0035] The water inlet system in this embodiment also includes an external circulation pipe 25 and a pipeline pump 26. These are located outside the device body 10. The water inlet of the external circulation pipe 25 communicates with the lower side of the mixing zone 42, while the water outlet of the external circulation pipe 25 communicates with the upper side of the mixing zone 42. Through the backflow of the external circulation pipe 25 and the pipeline pump 26, the liquid in the reaction system circulates multiple times, continuously impacting the mixing zone 42, thereby agitating the solution within the reaction system and improving mixing efficiency. This eliminates the need for aeration and the use of a stirrer, effectively removing target pollutants while also simplifying the structural setup and reducing operating costs.

[0036] In this embodiment, the electronic control system 30 is mounted on one side of the device body 10. Also included are a pH meter 31 and an electrode plate wiring slot 32. The pH meter 31 probe is inserted into the liquid level of the mixing zone 42 to monitor and adjust the pH of the solution within the device in real time, ensuring that the solution pH remains within the optimal range for MAP precipitation during the reaction time, thereby enhancing nitrogen and phosphorus degradation. The connecting wires of the two electrode plate assemblies 41 are secured in the electrode plate wiring slot 32. The connecting wires of the pH meter 31 and the two electrode plate assemblies 41 are each electrically connected to the electronic control system 30. The aforementioned pipeline pump 26 is also electrically connected to the electronic control system 30. The electronic control system 30 enables comprehensive control of electrolysis and solution external circulation.

[0037] refer to Figure 2 and Figure 3 In this embodiment, the solid-liquid separation system is arranged at the lower part of the device body 10. The solid-liquid separation system includes a filter frame suspension and a filter screen 52. The filter screen 52 is connected to the filter frame suspension, and the filter frame suspension is detachably connected to the device body 10. A filter frame outlet 12 and a sealing cover plate 11 are arranged on the lower side of the device body 10. A rubber ring groove 13 is arranged around the filter frame outlet 12. A sealing rubber ring is sleeved on the sealing cover plate 11. The sealing cover plate 11 and the device body 10 are fixed by bolts. The sealing rubber ring is squeezed in the rubber ring groove 13, which can ensure that the sealing cover plate 11 seals the filter frame outlet 12. To show the internal structure of the device, Figure 2 yes Figure 1The diagram shows the structure of the device after removing the sealing cover plate 11 and the upper side panel of the device body 10. A frame tube 51 is provided on each side of the filter frame suspension. The frame tube 51 is connected to the device body 10 via a notched pipe clamp 53. Multiple sets of support rods 54 are vertically inserted between the two frame tubes 51. The filter screen 52 is laid on the multiple sets of support rods 54. On the lower side of the device body 10, the frame tube 51 can be pulled out of the device body 10 from the filter frame outlet 12 along the notched pipe clamp 53. To facilitate the extraction of the device, a hook can be provided at the end of the frame tube 51. The hook can be hooked with a tool to slowly pull the filter frame suspension out of the filter frame outlet. The appropriate mesh size of the filter screen 52 is selected according to the particle size of the MAP product. The mesh size can be selected from 100-400 mesh to allow the product to accumulate and precipitate on the filter screen 52. In this embodiment, the drainage system is set at the bottom of the device body 10, and the drainage system includes a water collection area 62, a water outlet pipe 61 and a slag discharge port 63. The water outlet pipe 61 is connected to the upper side of the water collection area 62, and the slag discharge port 63 is connected to the bottom of the water collection area 62. After the reaction time is completed, the sewage is discharged from the water outlet pipe 61. Figure 4 The outlet pipe 61 can be connected to the next device for other treatment. Crystals with smaller particle size can be discharged from the slag outlet 63 and then processed centrally. The filter frame suspension and filter screen 52 can be disassembled to facilitate the collection of precipitation products for subsequent treatment.

Claims

1. A MAP sedimentation treatment and recovery device for livestock and poultry wastewater, comprising a device body, on which a water inlet system, a reaction system, a solid-liquid separation system, a drainage system, and an electronic control system are arranged, characterized in that: The water inlet system includes a water inlet pipe, a reagent pipe and a diversion pipe. The water inlet pipe and the reagent pipe are respectively connected to the reaction system via the diversion pipe. The reaction system includes two electrode plate groups. Each electrode plate group includes multiple anode plates and cathode plates arranged at intervals and crosses. A mixing zone is set between the two electrode plate groups in the reaction system. The diversion pipe is connected to the mixing zone at the water outlet end.

2. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The diversion pipe includes two diversion branches, which are arranged in parallel and staggered. One of the diversion branches is connected to the water inlet pipe, and the other diversion branch is connected to the medicine pipe.

3. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1 or 2, characterized in that: The anode plate and cathode plate in the reaction system are respectively fixed in the device body through the plate clamping slots.

4. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 3 is characterized by: The anode plate is a magnesium or magnesium alloy plate, the cathode plate is a stainless steel plate, the spacing between adjacent anode plates and cathode plates in each electrode plate group is 1-3 cm, and the electrode plates opposite to each other on both sides of the mixing zone are electrode plates of different levels in the two electrode plate groups.

5. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The water inlet system also includes an external circulation pipe and a pipeline pump, which are arranged outside the device body. The water inlet end of the external circulation pipe is connected to the lower side of the mixing zone, and the water outlet end of the external circulation pipe is connected to the upper side of the mixing zone.

6. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The electronic control system is arranged on one side of the device body. A pH meter and an electrode wiring groove are also provided on the device body. The pH meter probe is inserted into the liquid surface of the mixing zone. The connecting wires of the two electrode plate groups are fixed in the electrode wiring groove. The connecting wires of the pH meter and the connecting wires of the two electrode plate groups are electrically connected to the electronic control system respectively.

7. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The solid-liquid separation system is arranged at the lower part of the device body, and the solid-liquid separation system includes a filter frame suspension and a filter screen. The filter screen is connected to the filter frame suspension, and the filter frame suspension is detachably connected to the device body. A filter frame outlet and a sealing cover plate are provided on the lower side of the device body. An apron groove is provided around the filter frame outlet, and a sealing apron is sleeved on the sealing cover plate. The sealing cover plate is fixed to the device body by bolts and the sealing apron is squeezed into the apron groove.

8. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 7, characterized in that: Frame tubes are respectively provided on both sides of the filter frame suspension, and the frame tubes are connected to the device body through notched pipe clamps. Multiple groups of support rods are vertically inserted between the two frame tubes, and the filter screen is laid on the multiple groups of support rods.

9. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: The drainage system is arranged at the bottom of the device body, and the drainage system includes a water collection area, a water outlet pipe and a slag discharge port. The water outlet pipe is connected to the upper side of the water collection area, and the slag discharge port is connected to the bottom of the water collection area.

10. The MAP sedimentation treatment and recovery device for livestock and poultry breeding wastewater according to claim 1, characterized in that: Air holes are arranged on the device body.

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