Magnesium-tricalcium aluminate fluidized bed device for pig raising wastewater recovery

Abstract

The utility model provides a magnesium-tricalcium aluminate fluidized bed device for recovering pig raising wastewater, which relates to the technical field of waste treatment and recovery equipment in the breeding industry and particularly comprises a main reaction area, a side reaction area and a reflux device communicated with the main reaction area and the side reaction area, the main reaction area is sequentially divided into a water inlet area, a reaction area and a clear water rising area in the wastewater flowing direction, the water inlet area is located at the bottommost part of the main reaction area, the reaction area is located on the side face of the water inlet area, wastewater guided in by the water inlet area directly enters the reaction area to react with magnesium-tricalcium aluminate, and the clear water rising area is located above the reaction area. A water outlet is formed in the clear water rising area and is used for connecting the main reaction area and the side reaction area, the side reaction area comprises a solid-liquid separation area, a water outlet and a sludge discharge port, one end of the reflux device is inserted into the separation area of the side reaction area, and the other end of the reflux device is inserted into the reaction area of the main reaction area, so that complete purification of wastewater is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of aquaculture waste treatment and recycling equipment, and particularly relates to a magnesium-tricalcium aluminate fluidized bed process device. Background Art

[0002] my country is the world's largest producer of large-scale pigs, and water pollution caused by pig farm wastewater has become a major source of agricultural pollution. Pig farm wastewater contains high concentrations of ammonia, nitrogen, and phosphorus. Direct discharge can lead to eutrophication, contaminating surface water and soil, posing a significant threat to the ecological environment.

[0003] The Chinese utility model with authorization number CN 203938564 U provides a pig farm wastewater recovery sedimentation and filtration equipment, including a primary sedimentation tank, a horizontal flow sedimentation tank, a fertilizer regulating tank, a material pump, a water pump, a pH monitoring device, a pH neutralization device and a dosing device. The primary sedimentation tank is a mother-and-child tank structure, wherein a solid-liquid mixed discharge port is provided on the child tank and is connected to the material pump, a liquid outlet is provided on the mother tank and is connected to the horizontal flow sedimentation tank through a water pump, a pH monitoring device and a pH neutralization device are provided in the horizontal flow sedimentation tank, and the horizontal flow sedimentation tank is connected to the fertilizer regulating tank through a water pump, and a dosing device is provided in the fertilizer regulating tank; the utility model utilizes the mother-and-child tank principle to perform solid-liquid separation on the precipitate, and adopts adsorption, filtration and biological fermentation self-purification to quickly purify the high-concentration pig farming waste liquid, discharge it in compliance with the standards, and make it into organic fertilizer. At the same time, the process is simple and the cost is low, effectively solving the problem of large-scale pig farming waste liquid polluting the environment.

[0004] However, the above patent provides a pig farm wastewater recovery sedimentation and filtration equipment. During the batch recovery process, the existing recovery device can only guarantee recovery but cannot guarantee complete purification, which poses a problem of environmental pollution. Therefore, it is necessary to provide a solution to improve this problem. Utility Model Content

[0005] The purpose of the utility model is to provide a magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater, which can ensure complete purification, prevent the discharge of harmful gases, and make recycling more convenient.

[0006] A magnesium-tricalcium aluminate fluidized bed device for recycling pig farming wastewater includes a main reaction zone and a secondary reaction zone, and also includes a reflux device connecting the main reaction zone and the secondary reaction zone. The main reaction zone is divided into a water inlet zone, a reaction zone, and a clean water rising zone in sequence along the wastewater flow direction, wherein the water inlet zone is located at the bottom of the main reaction zone, the reaction zone is located on the side of the water inlet zone, and the wastewater introduced into the water inlet zone directly enters the reaction zone, the clean water rising zone is located above the reaction zone, and a water outlet is provided in the clean water rising zone for connecting the main reaction zone and the secondary reaction zone, the secondary reaction zone includes a solid-liquid separation zone, a water outlet, and a mud discharge port, wherein the water outlet is located at the top of the secondary reaction zone, and the mud discharge port is located at the bottom of the secondary reaction zone, one end of the reflux device is inserted into the separation zone of the secondary reaction zone, and the other end is inserted into the reaction zone of the main reaction zone.

[0007] By adopting the above technical solution, wastewater is introduced from the water inlet area of the main reaction zone, and then flows into the reaction zone to undergo chemical reactions with the magnesium-tricalcium aluminate in the reaction zone to generate recyclable solid, liquid and gaseous products, wherein most of the solid products are discharged from the mud discharge port of the reaction zone, and the liquid products, a small part of the solid products and the incompletely reacted wastewater enter the clean water rising zone. In addition, the liquid products and a small part of the solid products after the reaction enter the secondary reaction zone from the water outlet of the clean water rising zone, and the liquid products and a small part of the solid products are subjected to solid-liquid separation in the separation zone, wherein the solid products are discharged from the mud discharge port at the bottom of the separation zone, and the liquid products are discharged from the water outlet of the secondary reaction zone, and the incompletely reacted wastewater is introduced into the reaction zone of the main reaction zone by the reflux device to continue the reaction, and the cycle is repeated to achieve the effect of complete purification.

[0008] Optionally, there is an isolation plate between the water inlet area and the reaction area, the diameter of the small holes on the isolation plate is smaller than that of magnesium-tricalcium aluminate, and the stop valve of the water inlet area is closed when the water inflow is sufficient to prevent wastewater backflow.

[0009] By adopting the above technical solution, when the operation is stopped, the stop valve of the water inlet area is closed to prevent the wastewater from flowing back out. In addition, the isolation plate between the water inlet area and the reaction area can prevent the solid biomass generated after the reaction from flowing back and blocking the water inlet of the water inlet area.

[0010] Optionally, a plug flow device is provided at the bottom of the reaction zone in the main reaction zone to accelerate the reaction between the wastewater and the magnesium-tricalcium aluminate in the reaction zone, and a mud discharge port is provided at the bottom of the reaction zone and the bottom of the sedimentation tank to discharge the solid product after the reaction.

[0011] By adopting the above technical solution, when wastewater flows into the reaction zone, the flow-pushing device accelerates the reaction between the wastewater and magnesium-tricalcium aluminate, and can push the liquid product after the reaction into the rising area of clean water to separate the solid and liquid products after the reaction. In addition, the mud discharge port of the reaction zone can discharge the solid product after the reaction, preventing the accumulation of solid products from affecting the reaction and facilitating recovery.

[0012] Optionally, the clean water rising area is provided with a liquid level sensor to monitor the water level to prevent overflow, and the clean water rising area is provided with a pH probe to monitor changes in the acidity and alkalinity of the water, so as to monitor whether the reaction area is the best reaction environment.

[0013] By adopting the above technical solution, when wastewater flows into the reaction zone, the pH probe monitors the reaction environment of the reaction zone, thereby controlling the reaction environment of the reaction zone and making the reaction environment of the reaction zone optimal. In addition, the liquid level sensing area in the clean water rising area is used to monitor the water level in the clean water rising area to prevent excessive wastewater from entering, prevent wastewater that has not been fully reacted from flowing into the subsequent area, and prevent wastewater from overflowing outside the device.

[0014] Optionally, the tail gas collection device in the tail gas collection area collects harmful gases generated after the reaction, and the observation port in the tail gas collection area facilitates observation of whether magnesium-tricalcium aluminate needs to be added and the specific reaction status.

[0015] By adopting the above technical solution, when the harmful gaseous products generated by the wastewater after the reaction in the reaction zone diffuse from the clean water rising area to the exhaust gas collection area, the exhaust gas collection device in the exhaust gas collection area collects the gaseous products diffused by the rising clean water to prevent them from diffusing outside the device and causing safety problems for the operators. In addition, the reaction between magnesium-tricalcium aluminate and the wastewater can be observed at the observation port at the top of the main reaction zone to determine whether magnesium-tricalcium aluminate needs to be added.

[0016] Optionally, the water outlet of the main reaction zone is provided with a triangular weir to reduce the water discharge volume so that magnesium-tricalcium aluminate in the reaction zone reacts fully with the wastewater and prevent the solid product from clogging the water outlet.

[0017] By adopting the above technical solution, a triangular weir is provided at the water outlet in the main reaction zone, which can reduce the water discharge volume and enable the magnesium-tricalcium aluminate in the reaction zone to fully react with the wastewater. In addition, when the wastewater and magnesium-tricalcium aluminate react, the liquid and solid products generated flow out of the triangular weir at the water outlet of the main reaction zone, and most of the solid products are blocked in the triangular weir, which plays the role of separating the products and can also prevent the solid products from clogging the water outlet.

[0018] Optionally, the diversion device in the secondary reaction zone can discharge the wastewater from the main reaction zone into the bottom of the sedimentation tank to accelerate solid-liquid separation, and the sedimentation tank is provided with a mud discharge port to collect solid products.

[0019] By adopting the above technical solution, the products generated after the reaction can be uniformly introduced into the bottom of the secondary reaction zone from the diversion device, and the solid products remain at the bottom of the secondary reaction zone due to density issues, while the liquid products flow out from the water outlet of the secondary reaction zone, thereby performing solid-liquid separation on the products, and the solid products are discharged from the mud outlet, which is convenient for classification and recovery.

[0020] Optionally, the main reaction zone and the auxiliary reaction zone have overflow outlets for accident warning situations.

[0021] By adopting the above technical solution, the water level conditions in the main reaction zone and the auxiliary reaction zone can be used to warn. When the water level is higher than the overflow outlet, the wastewater will flow out of the device, thereby reminding the operator to deal with the problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The utility model provides an overall structural schematic diagram of a magnesium-tricalcium aluminate fluidized bed device for treating piggery wastewater.

[0023] Explanation of the accompanying symbols: 1. Main reaction zone; 11. Water inlet zone; 111. Check valve; 12. Reaction zone; 121. Fine screen; 122. Flow-pushing device; 123. pH probe; 13. Clean water rising zone; 131. Triangular weir; 132. Overflow port of main reaction zone; 133. Water outlet of main reaction zone; 134. Liquid level sensor; 14. Tail gas collecting zone; 141. Tail gas collecting device; 142. Observation port; 2. Auxiliary reaction zone; 21. Overflow port of auxiliary reaction zone; 22. Water outlet of auxiliary reaction zone; 23. Central pipe of sedimentation tank; 24. Separation zone; 3. Main valve; 31. Mud discharge port of main reaction zone; 32. Mud discharge port of auxiliary reaction zone; 4. Reflux device; 5. Signal receiver. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs. The words "including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0025] See also Figure 1The utility model provides a magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater, comprising a main reaction zone 1 and a side reaction zone 2, and also comprising a reflux device 4 connecting the main reaction zone 1 and the side reaction zone 2, wherein the main reaction zone 1 is divided into a water inlet zone 11, a reaction zone 12, a clean water rising zone 13, and a tail gas collection zone 14 in sequence along the flow direction of the wastewater, wherein the water inlet zone 11 is located at the bottom of the main reaction zone 1 and is used to input wastewater, the reaction zone 12 is located on the side of the water inlet zone 11 and is used for the reaction of wastewater with magnesium-tricalcium aluminate, and a mud outlet is provided at the bottom of the reaction zone 12 for discharging solid products produced after the reaction, in addition, an isolation plate is provided between the water inlet zone 11 and the reaction zone 12, the clean water rising zone 13 is located above the reaction zone 12, and the clean water rising zone 13 is provided with a main reaction The zone outlet 133 is used to discharge the liquid product generated by the reaction. The main reaction zone outlet 133 connects the main reaction zone 1 and the secondary reaction zone 2. The tail gas collection zone 14 is located at the top of the main reaction zone 1 and is used to collect the gaseous product generated by the reaction. The secondary reaction zone 2 includes a solid-liquid separation zone 24, a secondary reaction zone outlet 22, and a secondary reaction zone mud discharge port 32, wherein the secondary reaction zone outlet 22 is located at the top of the secondary reaction zone 2, and the secondary reaction zone mud discharge port 32 is located at the bottom of the secondary reaction zone 2, wherein the separation zone 24 is used for solid-liquid separation of the product, the secondary reaction zone outlet 22 is used to discharge the liquid product, and the secondary reaction zone mud discharge port 32 is used to discharge the solid product. One end of the reflux device 4 is inserted into the separation zone 24 of the secondary reaction zone 2, and the other end is inserted into the reaction zone 12 of the main reaction zone 1. Specifically, the main reaction zone 1 is a fluidized bed, the secondary reaction zone 2 is a sedimentation tank, the reflux device 4 is a self-priming pump, and the main reaction zone mud discharge port 31 and the secondary reaction zone mud discharge port 32 are connected to a main valve 3 for uniformly collecting the discharged solid products.

[0026] In fact, wastewater is introduced from the water inlet of the water inlet zone 11, and then flows into the reaction zone 12 through the fine screen 121, and chemically reacts with the magnesium-tricalcium aluminate in the reaction zone 12 to generate recyclable solid, liquid and gaseous products, most of which are discharged from the mud discharge port of the reaction zone 12, a small part of the solid products, liquid products and unreacted wastewater enter the clean water rising zone 13, and the gaseous products are collected by the tail gas collection zone 14. In addition, when the solid products, liquid products and unreacted wastewater enter the separation zone 24 of the secondary reaction zone 2 from the main reaction zone outlet 133, the solid products and liquid products are separated into solid and liquid in the separation zone 24, and the solid products are discharged from the secondary reaction zone mud discharge port 32 at the bottom of the separation zone 24, and the liquid products are discharged from the secondary reaction zone outlet 22. The unreacted wastewater is guided back to the reaction zone by the reflux device 4 to continue the reaction. Specifically, the solid product is struvite crystals MgNH4PO4·6H2O, the liquid product is water, and the gaseous product is ammonia.

[0027] In some embodiments, the water inlet area 11 of the main reaction zone 1 is used to introduce wastewater into the inlet area, where wastewater can be discharged centrally and is equipped with a check valve 111. In fact, the check valve 111 can prevent the wastewater introduced into the water inlet area 11 from flowing back.

[0028] In some embodiments, a fine screen 121 is provided between the water inlet region 11 and the reaction region 12 to prevent magnesium-tricalcium aluminate from flowing back into the water inlet region 11 and clogging the water inlet. In practice, the pore diameter of the fine screen 121 is smaller than that of the magnesium-tricalcium aluminate.

[0029] In some embodiments, reaction zone 12 of main reaction zone 1 is used to react wastewater with magnesium-tricalcium aluminate. A flow-pushing device 122 is installed at the bottom of reaction zone 12 to promote the upward circulation of wastewater and magnesium-tricalcium aluminate, accelerating the reaction. Furthermore, magnesium-tricalcium aluminate immediately reacts with wastewater upon contact, making the reaction environment slightly alkaline. Specifically, flow-pushing device 122 is a flow-pushing device.

[0030] In fact, in the reaction zone 12, after magnesium-tricalcium aluminate is mixed with wastewater, a hydration reaction immediately occurs on the surface of magnesium-tricalcium aluminate to form calcium aluminum double hydroxide (CaAl-LDH), which adjusts the pH of the water to make it weakly alkaline, which helps ammonium nitrogen to escape in the form of ammonia gas. At the same time, the alkaline environment helps the formation of struvite crystals, and the filler releases a large amount of Mg. 2+ With NH4+, PO4 in sewage 3 - Formation of struvite crystals MgNH4PO4·6H2O precipitate in a molar ratio of 1:1:1.

[0031] In some embodiments, the clean water rising area 13 is provided with a liquid level sensor 134 to monitor the water level of the fluidized bed and prevent overflow.

[0032] In some embodiments, the reaction zone 12 is provided with a pH probe 123 to monitor changes in the pH of the water, thereby ensuring an optimal reaction environment in the reaction zone 12. In fact, magnesium-tricalcium aluminate reacts best with wastewater under alkaline conditions. Therefore, the pH probe 123 is used to monitor the pH of the reaction zone 12, allowing operators to detect changes in pH in a timely manner.

[0033] In some embodiments, the liquid level sensor 134 and the pH probe 123 are both connected to the signal receiver 5 to facilitate observation by the operator.

[0034] In some embodiments, a main reaction zone 1 has a main reaction zone sludge outlet 31 at the bottom of reaction zone 12 to discharge the solid product produced by magnesium-tricalcium aluminate for classification and recovery. After the reaction is complete, the resulting struvite crystals (MgNH₄PO₄·6H₂O) sink to the bottom of reaction zone 12 due to their greater density than the liquid in the fluidized bed. The main reaction zone sludge outlet 31 is then opened to discharge the resulting MgNH₄PO₄·6H₂O.

[0035] In some embodiments, the tail gas collection area 14 of the main reaction zone 1 is provided with a tail gas collection device 141 for collecting harmful gases generated by the reaction. In fact, the ammonia generated by the reaction is collected by the activated carbon in the tail gas collection device 141.

[0036] In some embodiments, the tail gas collection area 14 is provided with an observation port 142 to monitor the adequacy of magnesium tricalcium aluminate to ensure its continued reaction with the wastewater. A suitable diameter for the observation port 142 is 15 to 25 cm. A diameter too small can hinder maintenance personnel from observing and adding filler, while a diameter too large can create a safety hazard of falling. Furthermore, after opening the observation port 142, it should not be approached immediately to prevent the immediate release of ammonia and other toxic gases that could be absorbed by the human body. If necessary, the observation port 142 can be connected to a central control system to enable remote closure and automated filler addition.

[0037] In some embodiments, the clean water rising zone 13 of the primary reaction zone 1 is provided with a primary reaction zone outlet 133 for directing the liquid product generated after the reaction into the secondary reaction zone 2. In practice, the triangular weir 131 provided at the outlet can reduce the amount of water discharged, allowing for a full reaction between the magnesium-tricalcium aluminate and the wastewater in the reaction zone 12, and can also prevent the solid product from clogging the outlet.

[0038] In some embodiments, the separation zone 24 of the secondary reaction zone 2 can separate the solid product from the liquid product. In fact, the density of the solid product is greater than that of the liquid product, resulting in a solid-liquid separation state.

[0039] In some embodiments, a secondary reaction zone 24 is provided with a secondary reaction zone 2 having a sludge discharge port 32 at the bottom thereof for discharging the separated solid product. In practice, the secondary reaction zone sludge discharge port 32 is provided with a sludge discharge valve to control the discharge of the solid product and prevent the discharge of the liquid product from the sludge discharge port.

[0040] In some embodiments, a side reaction zone outlet 22 is provided at the top of the side reaction separation zone 24 to collect the overflowed liquid product. In practice, the liquid product generated after the reaction slowly overflows from the outlet at the top of the sedimentation tank, ensuring that the overflowed liquid product has a high purity.

[0041] In some embodiments, the main reaction zone outlet 133 of the clear water rising zone 13 is connected to the central pipe 23 of the sedimentation tank, allowing the products from the main reaction zone 1 to be centrally directed to the bottom of the sedimentation tank, thereby accelerating solid-liquid separation of the products. In practice, solid-liquid separation is possible because the density of the solid product is greater than that of the liquid product.

[0042] In some embodiments, a main reaction zone overflow port 132 and a secondary reaction zone overflow port 21 are provided at the top of the main reaction zone 1 and the secondary reaction zone 2, respectively, to prevent device failure or blockage and water overflow, thereby alerting the operator to shut down the device. In addition, the location of the problem can be quickly identified and repaired in time.

[0043] While the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations may be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the claims. Furthermore, the present invention described herein may have other embodiments and may be implemented or carried out in a variety of ways.

Claims

1. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater, characterized in that: It includes a main reaction zone and a secondary reaction zone, and also includes a reflux device connecting the main reaction zone and the secondary reaction zone. The main reaction zone is divided into a water inlet zone, a reaction zone, and a clean water rising zone in sequence along the flow direction of the wastewater, wherein the water inlet zone is located at the bottom of the main reaction zone, the reaction zone is located on the side of the water inlet zone, and the wastewater introduced into the water inlet zone directly enters the reaction zone to react with magnesium-tricalcium aluminate, the clean water rising zone is located above the reaction zone, and a water outlet is provided in the clean water rising zone for connecting the main reaction zone and the secondary reaction zone, the secondary reaction zone includes a separation zone, a water outlet, and a mud discharge port, wherein the water outlet is located at the top of the secondary reaction zone, and the mud discharge port is located at the bottom of the secondary reaction zone, one end of the reflux device is inserted into the separation zone of the secondary reaction zone, and the other end is inserted into the reaction zone of the main reaction zone.

2. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 1, characterized in that: There is an isolation plate between the water inlet area and the reaction area, and the stop valve of the water inlet area is closed after the work is completed.

3. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 2, characterized in that: A flow-pushing device and a mud discharge port are provided at the bottom of the reaction zone.

4. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 3, characterized in that: The clean water rising area is provided with a liquid level sensor to monitor the water level to prevent overflow, the reaction area is provided with a pH probe to monitor the changes in the pH of the water to ensure the best reaction environment in the reaction area, and an exhaust gas collection area is provided on the top of the clean water rising area.

5. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 4, characterized in that: The tail gas collection area is equipped with a tail gas collection device to collect the harmful gases produced after the reaction.

6. A magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 5, characterized in that: An observation port is provided on the top of the tail gas collection area to facilitate observation of whether magnesium-tricalcium aluminate needs to be added and the reaction status.

7. The magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 1, characterized in that: The water outlet of the main reaction zone is provided with a triangular weir to reduce the water discharge volume so that the magnesium-tricalcium aluminate in the reaction zone fully reacts with the wastewater and prevents the magnesium-tricalcium aluminate from clogging the water outlet.

8. The magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 1, characterized in that: The diversion device in the secondary reaction zone can discharge the wastewater after the reaction in the main reaction zone into the bottom of the sedimentation tank, thereby accelerating the solid-liquid separation.

9. The magnesium-tricalcium aluminate fluidized bed device for recycling piggery wastewater according to claim 1, characterized in that: Overflow ports are provided above the water outlets of the main reaction zone and the auxiliary reaction zone for accident warning.

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