Front efficient nitrogen and phosphorus removal device

Abstract

The utility model discloses a preposed efficient nitrogen and phosphorus removal device, which belongs to the technical field of food chemical industry wastewater treatment equipment, and comprises a mixing tank, a reaction tank and a sedimentation tank, a stirring mechanism is arranged in the mixing tank, an enhanced phosphorus removal agent feeding bin and an alkali dosing mechanism are arranged outside the mixing tank, and the reaction tank and the sedimentation tank are arranged in the mixing tank. A filler and a plurality of perforated aeration pipes are arranged in the reaction tank, an aeration fan is mounted outside the reaction tank, and an air outlet port of the aeration fan is communicated with an aeration main pipe; the soybean protein wastewater treatment device can optimize the soybean protein wastewater treatment process, improve the removal efficiency of nitrogen and phosphorus pollutants, reduce the sewage treatment operation cost and improve the wastewater treatment efficiency by utilizing an enhanced phosphorus removal agent adding bin and an alkali dosing mechanism in the mixing tank, filler, a perforated aeration pipe and biological strains in the reaction tank and a mud bucket and a special crystal discharge pump in the sedimentation tank. The civil construction and equipment investment cost of a sewage treatment area is reduced, and nitrogen and phosphorus substances are recycled while the sludge is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of food and chemical wastewater treatment equipment, and more specifically, to a pre-processing high-efficiency nitrogen and phosphorus removal device. Background Technology

[0002] Soy protein isolate is made from dehulled, defatted, cold-pressed soybean cake or low-temperature defatted soybean meal as raw materials, through processes such as dilute alkali extraction, acid precipitation, centrifugation, and spray drying.

[0003] Soy protein isolate production process: Soybean meal → Alkali dissolution → Acid precipitation → Neutralization → Heating modification → Drying → Soy protein isolate. Low-temperature defatted soybean meal is extracted with a dilute alkaline solution. Most of the protein in the soybean meal dissolves in the dilute alkaline solution. Centrifugation is then used to remove insoluble substances such as polysaccharides and residual protein from the soybean meal. The pH of the extract is then adjusted to approximately 4.5 with acid. At this point, the protein is at its isoelectric point and coagulates and precipitates. The protein precipitate is then separated, and finally, after washing, neutralization, and drying, soy protein is obtained.

[0004] Soybean protein wastewater mainly originates from the whey water separated by centrifugation during the acid precipitation and dehydration stage of soybean protein, followed by alkaline equipment rinsing water. The main pollutants in the whey water are high concentrations of solid or soluble proteins and polysaccharides, along with small amounts of inorganic components. The BOD / COD ratio is around 0.5, and the pH ranges from 4.2 to 4.5. Although the organic matter in soybean protein wastewater is easily degraded, with a degradation efficiency of over 95% for high-carbon organic matter after treatment with anaerobic and aerobic microorganisms, soybeans contain various amino acids and are rich in phosphorus, in addition to protein, fat, carbohydrates, and dietary fiber. Therefore, soybean protein wastewater generated during extraction leaves behind high concentrations of nitrogen and phosphorus pollutants. To prevent direct discharge into natural water bodies, which could damage the environment and harm human health, chemical phosphorus removal and biological nitrogen removal processes are used in actual wastewater treatment projects. While these methods are effective, they incur high operating costs for chemicals, energy, and sludge treatment. Furthermore, the formation of magnesium ammonium phosphate crystals in the anaerobic reactor easily causes pipe blockage, increasing maintenance rates, labor costs, and resulting in significant waste of nitrogen and phosphorus. Therefore, this study aims to improve the existing structure and provide a pre-treatment high-efficiency nitrogen and phosphorus removal device for greater practical value. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the purpose of this utility model is to provide a pre-processing high-efficiency nitrogen and phosphorus removal device. It can optimize the soybean protein wastewater treatment process by utilizing the enhanced phosphorus removal agent dosing tank and alkali dosing mechanism in the mixing tank, the packing material, perforated aeration pipe and biological inoculum in the reaction tank, and the sludge hopper and dedicated crystal discharge pump in the sedimentation tank. This improves the removal efficiency of nitrogen and phosphorus pollutants, reduces wastewater treatment operating costs, reduces civil construction and equipment investment costs in the wastewater treatment area, reduces sludge volume, and simultaneously achieves the reuse of nitrogen and phosphorus substances.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A pre-treatment high-efficiency nitrogen and phosphorus removal device includes a mixing tank, a reaction tank, and a sedimentation tank. The mixing tank is equipped with a stirring mechanism, and an enhanced phosphorus removal agent dosing chamber and an alkali dosing mechanism are installed outside the mixing tank. The reaction tank is equipped with packing material and multiple perforated aeration pipes. An aeration blower is installed outside the reaction tank, and the air outlet of the aeration blower is connected to an aeration main pipe. The aeration main pipe is connected to the corresponding perforated aeration pipes through aeration branch pipes. A sludge hopper is installed at the bottom of the sedimentation tank, and a dedicated crystal discharge pump is installed outside the sedimentation tank. The inlet of the dedicated crystal discharge pump is connected to a crystal discharge pipe, and one end of the crystal discharge pipe extends into the sedimentation tank.

[0010] Furthermore, the stirring mechanism includes a high-speed stirring motor fixed to the top of the mixing tank, the output shaft of which extends into the interior of the mixing tank and is connected to a high-speed stirring rod via a coupling.

[0011] Furthermore, a dry powder feeder is installed on the top of the enhanced phosphorus removal agent dosing bin, and the discharge port of the dry powder feeder is connected to the inside of the mixing tank through a conveying pipe.

[0012] Furthermore, the alkali dosing mechanism includes an alkali dosing tank located outside the mixing tank. An alkali dosing pump is connected between the alkali dosing tank and the mixing tank. An alkali dosing stirring motor is installed on the top of the alkali dosing tank. The output shaft of the alkali dosing stirring motor extends into the alkali dosing tank and is connected to an alkali dosing stirring rod via a coupling.

[0013] Furthermore, a central guide pipe is installed in the sedimentation tank, and a gravity flow pipe is connected to the outer periphery of the central guide pipe, with one end of the gravity flow pipe extending into the reaction tank.

[0014] Furthermore, an overflow weir is provided on the inner top wall of the sedimentation tank.

[0015] Furthermore, an online pH monitor is installed between the mixing tank and the alkali dosing pump, the reaction tank is filled with biological bacteria, and an electrical distribution box is installed on top of the enhanced phosphorus removal agent dosing chamber.

[0016] 3. Beneficial effects

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] (1) In this scheme, powdered enhanced phosphorus removal agent and liquid alkali are added to the wastewater in the mixing tank through a dry powder feeder and an alkali dosing mechanism, respectively. The mixture is then thoroughly stirred, dissolved, and reacted using a stirring mechanism. The reacted wastewater is then transported to the reaction tank, where biological bacteria are used as carriers. Under a micro-aeration environment, the enhanced phosphorus removal agent ions and NH4+ in the wastewater are removed. + and PO4 3- Crystals are formed, encapsulating the microbial strains, which are free or attached to the packing material, gradually forming large crystals. This allows nitrogen and phosphorus pollutants to be separated from the water, reducing the pollution of the wastewater.

[0019] (2) In this scheme, the wastewater enters the sedimentation tank again through the drainage diversion pipe and the crystals settle there. The crystals that fall off the packing can be taken out together with the crystals in the sedimentation tank as slow-release fertilizer, realizing the harmless migration and reuse of nitrogen and phosphorus elements. It can be greenly degraded in the natural environment, and the nitrogen and phosphorus elements are effectively and cyclically utilized to a large extent. At the same time, it also reduces the construction investment cost of the subsequent biochemical treatment unit. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the mixing tank location structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the reaction tank location structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the location and structure of the sedimentation tank of this utility model.

[0024] Explanation of the labels in the diagram:

[0025] 1. Mixing tank;

[0026] 2. Reaction tank;

[0027] 3. Sedimentation tank;

[0028] 4. Stirring mechanism; 401. High-speed stirring motor; 402. High-speed stirring rod;

[0029] 5. Strengthen the phosphorus removal agent dosing tank;

[0030] 6. Alkali dosing mechanism; 601. Alkali dosing tank; 602. Alkali dosing pump; 603. Alkali dosing stirring motor; 604. Alkali dosing stirring rod;

[0031] 7. Packing material;

[0032] 8. Perforated aeration pipe;

[0033] 9. Aeration blower;

[0034] 10. Aeration Supervisor;

[0035] 11. Aeration branch pipe;

[0036] 12. Mud bucket;

[0037] 13. Dedicated crystal removal pump;

[0038] 14. Crystal arrangement tube;

[0039] 15. Dry powder feeding machine;

[0040] 16. Conveying pipe;

[0041] 17. Central guide tube;

[0042] 18. Gravity flow pipes;

[0043] 19. Overflow weir;

[0044] 20. Online pH monitor;

[0045] 21. Biological strains;

[0046] 22. Distribution box. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0048] Example:

[0049] Please see Figures 1-4A pre-treatment high-efficiency nitrogen and phosphorus removal device includes a mixing tank 1, a reaction tank 2, and a sedimentation tank 3. The mixing tank 1 is equipped with a stirring mechanism 4, and an enhanced phosphorus removal agent dosing chamber 5 and an alkali dosing mechanism 6 are located outside the mixing tank 1. The reaction tank 2 is equipped with packing material 7 and multiple perforated aeration pipes 8. An aeration fan 9 is installed outside the reaction tank 2, and the outlet port of the aeration fan 9 is connected to an aeration main pipe 10. The aeration main pipe 10 is connected to the corresponding perforated aeration pipe 8 through aeration branch pipes 11. A sludge hopper 12 is installed at the bottom of the sedimentation tank 3. The sludge hopper 12 can be of a shaking type and has a smooth inner wall that is not easily adhered to. A dedicated crystal discharge pump 13 is installed outside the sedimentation tank 3. The inlet of the dedicated crystal discharge pump 13 is equipped with a crushing reamer to crush large crystal nuclei. The inlet of the crystal discharge pump 13 is connected to a crystal discharge pipe 14, and one end of the crystal discharge pipe 14 extends into the sedimentation tank 3. This crystal discharge pipe 14 adopts a special inner lining pipe with a smooth inner wall to prevent the dedicated crystal discharge pump 13 and the crystal discharge pipe 14 from being blocked, thus ensuring the smooth discharge of the slow-release fertilizer crystals. During use, the mixing tank 1 and the reaction tank 2 can be made of reinforced concrete anti-corrosion structure or carbon steel anti-corrosion structure. The sedimentation tank 3 can be made of carbon steel lining structure or stainless steel structure. In addition, the perforated aeration pipe 8 and the packing 7 are designed to be liftable. When the perforated aeration pipe 8 is damaged and needs to be replaced, it can be easily removed for maintenance at any time. When there is a lot of attached material on the packing 7, it can be easily removed for cleaning at any time. The detached crystals can be used as slow-release fertilizer together with the crystals in the sedimentation tank 3.

[0050] See Figure 2 The stirring mechanism 4 includes a high-speed stirring motor 401 fixed to the top of the mixing tank 1. The output shaft of the high-speed stirring motor 401 extends into the mixing tank 1 and is connected to a high-speed stirring rod 402 via a coupling. In use, the high-speed stirring motor 401 and the high-speed stirring rod 402 work together to fully stir and dissolve the powdered enhanced phosphorus removal agent added by the dry powder feeder 15 and the liquid alkali added by the alkali dosing mechanism, ensuring full mixing and reaction of the agents.

[0051] See Figure 2 The top of the phosphorus removal agent addition bin 5 is equipped with a dry powder feeder 15, and the discharge port of the dry powder feeder 15 is connected to the inside of the mixing tank 1 through the conveying pipe 16.

[0052] See Figure 2 The alkali dosing mechanism 6 includes an alkali dosing tank 601 located outside the mixing tank 1. An alkali dosing pump 602 is connected between the alkali dosing tank 601 and the mixing tank 1. An alkali dosing stirring motor 603 is installed on the top of the alkali dosing tank 601. The output shaft of the alkali dosing stirring motor 603 extends into the alkali dosing tank 601 and is connected to an alkali dosing stirring rod 604 via a coupling.

[0053] See Figure 4A central guide pipe 17 is installed in the sedimentation tank 3. A gravity flow pipe 18 is connected to the outer periphery of the central guide pipe 17. One end of the gravity flow pipe 18 extends into the reaction tank 2. In use, the wastewater in the reaction tank 2 can be discharged into the sedimentation tank 3 for sedimentation through the cooperation of the central guide pipe 17 and the gravity flow pipe 18.

[0054] See Figure 4 An overflow weir 19 is provided on the inner side wall of the top of the sedimentation tank 3.

[0055] See Figure 1 and Figure 2 A pH online monitoring instrument 20 is installed between the mixing tank 1 and the alkali dosing pump 602. The pH online monitoring instrument 20 can realize automatic control interlock function with the alkali dosing pump 602 to monitor the pH value of the mixing zone in real time. The reaction tank 2 is filled with biological bacteria 21. A power distribution box 22 is installed on the top of the enhanced phosphorus removal agent dosing tank 5.

[0056] When using the equipment: check the entire device, connect the power supply, and ensure that the entire device is operating normally;

[0057] First, the powdered enhanced phosphorus removal agent in the addition bin 5 is added to the mixing tank 1 using the dry powder feeder 15. Then, liquid alkali is added to the mixing tank 1 using the alkali dosing device 6. Next, the stirring device 4 is used to thoroughly stir and dissolve the powdered enhanced phosphorus removal agent, liquid alkali, and wastewater, so that the pH of the mixed solution is between 8.5 and 9.5. The enhanced phosphorus removal agent ion: NH4+ + :PO4 3- The molar ratio is 1:1:1. An appropriate excess of the enhanced phosphorus removal agent can be added. The mixing time is approximately 30 minutes to ensure thorough mixing and reaction of the agents. During this time, the pH online monitoring instrument 20 installed in mixing tank 1 is automatically interlocked with the alkali dosing pump 602 to monitor the pH value of the mixing zone in real time. When the pH value is below 8.5, the alkali dosing pump 602 is turned on to automatically add liquid alkali; when the pH value is above 9.5, the alkali dosing pump 602 is turned off to automatically stop adding liquid alkali, ensuring the reaction conditions. The hydraulic retention time in reaction tank 2 is 6 hours. Biological strain 21 is used as a carrier. Through the aeration blower 9, in conjunction with the main aeration pipe 10 and aeration branch pipes 11, the reaction tank 2 is kept in a micro-aeration environment. This reduces the phosphorus removal agent ions and NH4+ ions in the wastewater. + and PO4 3-Crystals are formed, encapsulating the biological strains 21, which are free or attached to the packing material 7, gradually forming large crystals. This allows nitrogen and phosphorus pollutants to be separated from the water. At the same time, the stirring effect of micro-aeration prevents the crystals from settling in the reaction tank 2. Under the guidance of the gravity flow pipe 18, they enter the sedimentation tank 3. The sedimentation tank 3 is equipped with a central guide pipe 17 and a shaking mud hopper 12 with an angle greater than 45°. The crystals settle here. Finally, the crystals are smoothly discharged using a special crystal discharge pump 13 and crystal discharge pipe 14. At this time, the crystals that fall off the packing material 7 and the crystals discharged from the sedimentation tank 3 are used together as slow-release fertilizer, realizing the harmless migration and reuse of nitrogen and phosphorus elements. They can be greenly degraded in the natural environment, and at the same time, the nitrogen and phosphorus elements are effectively and cyclically utilized to a large extent.

[0058] Finally, it should be noted that in the description of this utility model, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A front-end high-efficiency denitrification and dephosphorization device, comprising a mixing tank (1), a reaction tank (2) and a sedimentation tank (3), characterized in that: The mixing pool (1) is provided with a stirring mechanism (4), the outside of the mixing pool (1) is provided with a strengthened phosphorus removal agent adding bin (5) and an alkali dosing mechanism (6), the reaction pool (2) is provided with a filler (7) and a plurality of perforated aeration pipes (8), the outside of the reaction pool (2) is provided with an aeration fan (9), the aeration fan (9) is communicated with an aeration main pipe (10) at the gas outlet port, the aeration main pipe (10) is communicated with the corresponding perforated aeration pipe (8) through an aeration branch pipe (11), the bottom of the sedimentation tank (3) is provided with a mud bucket (12), the outside of the sedimentation tank (3) is provided with a special crystal discharge pump (13), the inlet of the special crystal discharge pump (13) is connected with a crystal discharge pipe (14), and one end of the crystal discharge pipe (14) extends into the sedimentation tank (3).

2. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: The stirring mechanism (4) comprises a rapid stirring motor (401) fixed to the top of the mixing pool (1), the output shaft of the rapid stirring motor (401) extends into the mixing pool (1), and a rapid stirring rod (402) is drivingly connected to the output shaft through a shaft coupling.

3. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: The top of the strengthened phosphorus removal agent adding bin (5) is provided with a dry powder feeder (15), and the discharge port of the dry powder feeder (15) is communicated with the inside of the mixing pool (1) through a conveying pipe (16).

4. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: The alkali dosing mechanism (6) comprises an alkali dosing tank (601) arranged outside the mixing pool (1), an alkali dosing pump (602) is arranged between the alkali dosing tank (601) and the mixing pool (1), an alkali dosing stirring motor (603) is arranged on the top of the alkali dosing tank (601), the output shaft of the alkali dosing stirring motor (603) extends into the alkali dosing tank (601), and an alkali dosing stirring rod (604) is drivingly connected to the output shaft through a shaft coupling.

5. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: The sedimentation tank (3) is provided with a central flow guide pipe (17), the outer periphery of the central flow guide pipe (17) is communicated with a self-flowing pipe (18), and one end of the self-flowing pipe (18) extends into the reaction pool (2).

6. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: The inside of the top of the sedimentation tank (3) is provided with an overflow weir (19).

7. The pre-high-efficiency denitrification and dephosphorization device according to claim 1, characterized in that: A pH on-line monitor (20) is arranged between the mixing pool (1) and the alkali dosing pump (602), the inside of the reaction pool (2) is filled with biological bacteria (21), and a distribution box (22) is arranged on the top of the strengthened phosphorus removal agent adding bin (5).

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