Nitrogen-containing wastewater treatment device

Abstract

The utility model relates to the technical field of nitrogenous wastewater treatment, in particular to a nitrogenous wastewater treatment device. The device comprises a reactor, an aeration assembly, a water inlet assembly and a monitoring assembly, a guide cylinder is coaxially arranged in the reactor; the reactor is filled with microorganism balls; the monitoring assembly comprises a main controller and a plurality of detection probes; the main controller is arranged outside the reactor, and each detection probe is arranged inside the reactor; the main controller is respectively connected with each detection probe through a line; one end of the water inlet assembly is communicated with nitrogenous wastewater, and the other end is communicated with the bottom of the reactor; the water inlet assembly comprises a water inlet pump connected with the main controller; one end of the aeration assembly is communicated with air or oxygen, and the other end is communicated with the bottom of the reactor; and the aeration assembly comprises an air blower connected with the main controller. The device disclosed by the utility model has the effects of simple and compact structure, small occupied area, low operation cost and good nitrogen removal performance.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen-containing wastewater treatment technology, and specifically to a nitrogen-containing wastewater treatment device. Background Technology

[0002] Large amounts of nitrogen entering water bodies cause a decline in water quality and form nitrogen-containing wastewater. When the nitrogen content in water bodies accumulates to a certain level, eutrophication occurs, manifested as excessive algal blooms, decreased dissolved oxygen and water transparency, and rapid deterioration of water quality. The nitrate and nitrite nitrogen present in water bodies pose harm to humans and aquatic life. Long-term consumption of water containing nitrate nitrogen can cause chronic poisoning, while nitrite nitrogen can react with hemoglobin in humans and aquatic organisms to form methemoglobin, affecting oxygen transport capacity. Furthermore, nitrite nitrogen reacts with proteins in the human body to induce the formation of nitrosamines, thereby increasing the risk of cancer. Therefore, nitrogen-containing wastewater has a serious destructive effect on urban ecosystems, further impacting the daily lives of citizens.

[0003] Existing nitrogen-containing wastewater treatment methods in China can be broadly categorized into three main types: physical treatment, chemical treatment, and biological treatment. However, these methods suffer from the following main problems: lengthy process flow, complex facilities, large land area, and high infrastructure investment; slow proliferation rate of nitrifying bacteria and difficulty in maintaining high biological concentrations, resulting in poor nitrogen removal performance; and increasing the size of the aeration tank and extending the hydraulic retention time will further increase investment and operating costs.

[0004] In summary, there is a need to provide a nitrogen-containing wastewater treatment device to solve the problems of complex facilities, large footprint, high operating costs, and poor nitrogen removal performance in existing technologies. Utility Model Content

[0005] The purpose of this utility model is to provide a nitrogen-containing wastewater treatment device with a simple and compact structure, small footprint, low operating cost, and good nitrogen removal performance. The specific technical solution is as follows:

[0006] A nitrogen-containing wastewater treatment device includes a reactor, an aeration assembly, an influent assembly, and a monitoring assembly. A guide tube is coaxially arranged inside the reactor. Microbial balls are filled inside the reactor. The monitoring assembly includes a main controller and multiple detection probes. The main controller is located outside the reactor, while each detection probe is located inside the reactor. The main controller is connected to each detection probe via wiring. One end of the influent assembly is connected to the nitrogen-containing wastewater, and the other end is connected to the bottom of the reactor. The influent assembly includes an influent pump connected to the main controller. One end of the aeration assembly is connected to air or oxygen, and the other end is connected to the bottom of the reactor. The aeration assembly includes a blower connected to the main controller.

[0007] Optionally, the axial height of the guide tube is 1 / 2 to 3 / 4 times the axial height inside the reactor; the inner diameter of the guide tube is 1 / 4 to 1 / 2 times the inner diameter of the reactor; the axial height inside the reactor is 3 to 7 m, and the height-to-diameter ratio is 2 to 6.

[0008] Optionally, the diameter of the microbial balls is 3 to 6 mm.

[0009] Optionally, a ladder structure is provided on the side wall inside the reactor from bottom to top.

[0010] Optionally, the aeration assembly further includes an aeration pipeline, an aeration valve, and an aeration disc; one end of the aeration pipeline is connected to the air outlet of the blower, and the other end is connected to the aeration disc; the aeration valve is disposed on the aeration pipeline; the aeration disc is disposed at the bottom of the reactor, and includes a main air inlet and a plurality of pressurized outlet air inlets arranged circumferentially around the main air inlet; the main air inlet is connected to the aeration pipeline; each of the pressurized outlet air inlets is connected to the main air inlet.

[0011] Optionally, the water inlet assembly further includes a water inlet pipe, a water inlet valve, and a water distribution pipe; one end of the water inlet pipe is connected to the water inlet pump, and the other end is connected to the water distribution pipe; the water distribution pipe is located at the bottom of the reactor and has multiple water outlets thereon; the water inlet valve is located on the water inlet pipe;

[0012] The water distribution pipe, the aeration disc, and the guide tube are arranged sequentially from bottom to top inside the reactor;

[0013] The nitrogen-containing wastewater treatment device also includes a drain pipe and a drain valve; the drain pipe is connected to the bottom of the reactor; and the drain valve is installed on the drain pipe.

[0014] Optionally, a water collection tank is provided at the top of the reactor; one side of the water collection tank is connected to the nitrogen-containing wastewater in the reactor through an outlet baffle, while the other side is connected to an outlet pipeline; an outlet valve is provided on the outlet pipeline; the outlet baffle is connected and fixed by a bracket provided on the water collection tank.

[0015] Optionally, the reactor may include a top-opening structure with a narrow bottom and a wide top, or a reaction vessel structure;

[0016] An observation hole and a manhole are provided on the side wall of the reactor structure; a feeding hole is provided on the top of the reactor structure.

[0017] Optionally, the main controller includes a PLC controller; each of the detection probes includes a pH probe, dissolved oxygen probe, temperature probe, ammonia nitrogen probe, total nitrogen probe, COD probe, BOD probe, and total phosphorus probe.

[0018] The application of the technical solution of this utility model has at least the following beneficial effects:

[0019] This utility model provides a nitrogen-containing wastewater treatment device with simple and compact structure, small footprint, low operating cost, and good nitrogen removal performance. Specifically, a guide tube is coaxially arranged inside the reactor, allowing the influent to float upwards along the guide tube under aeration, increasing the contact time and area between the nitrogen-containing wastewater and the microbial balls. This not only improves the purification efficiency of the nitrogen-containing wastewater but also reduces operating costs. When the liquid level exceeds the guide tube, the nitrogen-containing wastewater overflows to both sides and moves downwards under gravity, forming a circulating flow. This helps maintain the uniform mixing of the nitrogen-containing wastewater in the reactor and avoids dead zones. The microbial balls contain aerobic denitrifying microorganisms, and air is introduced into the reactor through the aeration components. The addition of gas or oxygen increases the dissolved oxygen content in the water, which is beneficial for the respiration of aerobic denitrifying microorganisms and the degradation of nitrogenous organic matter. Furthermore, the bubbles generated by aeration can fluidize the microbial balls in the water through the guide tube, promoting the mixing and flow of nitrogenous organic matter to be degraded, thus improving mass transfer efficiency. Additionally, the microbial balls provide a stable environment for the growth and metabolism of aerobic denitrifying microorganisms, enabling them to more effectively treat organic matter in nitrogenous wastewater. The concentration of microorganisms in the reactor can be flexibly and dynamically controlled by adding or removing microbial balls. Moreover, this invention uses a main controller to adjust the influent flow rate of the influent component and the aeration flow rate of the aeration component in real time based on the information detected by each detection probe, ensuring sufficient purification of nitrogenous wastewater.

[0020] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of a nitrogen-containing wastewater treatment device in Example 1 (the arrows inside the reactor indicate the direction of water flow);

[0023] Figure 2 yes Figure 1 Top view of the reactor;

[0024] Figure 3 This is a top view of the aeration disc;

[0025] Figure 4 This is a schematic diagram of the water outlet baffle.

[0026] Figure 5 This is a schematic diagram of a nitrogen-containing wastewater treatment device in Example 2 (the arrows inside the reactor indicate the direction of water flow);

[0027] Figure 6 yes Figure 5 Top perspective view of the reactor;

[0028] The components include: 1. Reactor; 2. Aeration assembly; 2.1. Blower; 2.2. Aeration pipeline; 2.3. Aeration valve; 2.4. Aeration disc; 2.4.1. Main air inlet; 2.4.2. Pressurized air outlet; 3. Water inlet assembly; 3.1. Water inlet pump; 3.2. Water inlet pipeline; 3.3. Water inlet valve; 3.4. Water distribution pipe; 4. Monitoring assembly; 4.1. Main controller; 4.2. Detection probe; 5. Flow guide tube; 6. Microbial balls; 7. Drain pipeline; 8. Drain valve; 9. Water collection tank; 10. Water outlet baffle; 11. Water outlet pipeline; 12. Water outlet valve; 13. Ladder structure; 14. Observation hole; 15. Manhole; 16. Feeding hole. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 are within the protection scope of the present utility model.

[0030] Example 1:

[0031] See Figures 1-4A nitrogen-containing wastewater treatment device includes a reactor 1 (specifically, a top-opening structure with a narrow bottom and wide top), an aeration assembly 2, an inlet assembly 3, and a monitoring assembly 4. A guide tube 5 is coaxially arranged inside the reactor 1. Microbial balls 6 are filled inside the reactor 1. The monitoring assembly 4 includes a main controller 4.1 and multiple detection probes 4.2. The main controller 4.1 is located outside the reactor 1, while each of the detection probes 4.2 is located inside the reactor 1. The main controller 4.1 is connected to each of the detection probes 4.2 via wiring. One end of the inlet assembly 3 is connected to the nitrogen-containing wastewater, and the other end is connected to the bottom of the reactor 1. The inlet assembly 3 includes an inlet pump 3.1 connected to the main controller 4.1. One end of the aeration assembly 2 is connected to air, and the other end is connected to the bottom of the reactor 1. The aeration assembly 2 includes a blower 2.1 connected to the main controller 4.1.

[0032] A guide tube 5 is coaxially arranged inside the reactor 1, allowing the influent to float upwards along the guide tube 5 under aeration. This increases the contact time and area between the nitrogen-containing wastewater and the microbial balls 6, improving the purification efficiency of the nitrogen-containing wastewater and reducing operating costs. When the liquid level exceeds the guide tube 5, the nitrogen-containing wastewater overflows to both sides and moves downwards under gravity, forming a circulating flow. This helps maintain the uniform mixing of the nitrogen-containing wastewater within the reactor 1 and avoids dead zones. The microbial balls 6 contain aerobic denitrifying microorganisms (such as denitrifying bacteria), which are introduced into the reactor through the aeration component 2. Air is introduced into reactor 1, increasing the dissolved oxygen content in the water, which is beneficial for the respiration of aerobic denitrifying microorganisms and the degradation of nitrogen-containing organic matter. In addition, the bubbles generated by aeration can also achieve the fluidization of microbial balls 6 in the water through the guide tube 5, promoting the mixing and flow of nitrogen-containing organic matter to be degraded in the water, which is beneficial for improving mass transfer efficiency. Furthermore, microbial balls 6 provide a stable environment for the growth and metabolism of aerobic denitrifying microorganisms, enabling microorganisms to treat organic matter in nitrogen-containing wastewater more effectively. By supplementing or discharging microbial balls 6, the concentration of microorganisms in reactor 1 can be flexibly and dynamically controlled.

[0033] The axial height of the guide tube 5 is 2 / 3 times the axial height inside the reactor 1, and the inner diameter of the guide tube 5 is 1 / 3 times the inner diameter of the reactor 1, which can effectively increase the contact time and area between the nitrogen-containing wastewater and the microbial balls 6; the axial height inside the reactor 1 is 3-7m (6m can be selected specifically), and the height-to-diameter ratio is 2-6 (4 can be selected specifically), which can effectively increase the residence time of the nitrogen-containing wastewater in the reactor 1 and improve the purification effect.

[0034] The diameter of the microbial balls 6 is 3-6 mm (specifically 4 mm), which facilitates the reasonable loading of microbial content and the fluidization of the microbial balls 6 in the water.

[0035] A ladder structure 13 is provided on the side wall of the reactor 1 from bottom to top.

[0036] The aeration assembly 2 further includes an aeration pipe 2.2, an aeration valve 2.3, and an aeration disc 2.4; one end of the aeration pipe 2.2 is connected to the air outlet of the blower 2.1, and the other end is connected to the aeration disc 2.4; the aeration valve 2.3 is disposed on the aeration pipe 2.2; the aeration disc 2.4 is disposed at the bottom of the reactor 1, and includes a main air inlet 2.4.1 and a plurality of pressurized outlet air inlets 2.4.2 arranged circumferentially around the main air inlet 2.4.1; the main air inlet 2.4.1 is connected to the aeration pipe 2.2; each of the pressurized outlet air inlets 2.4.2 is connected to the main air inlet 2.4.1 to achieve uniform aeration. Each of the pressurized outlet vents 2.4.2 forms a high-density microporous structure. When gas passes through the micropores, the pore resistance of the micropores themselves will force the gas to accumulate pressure at the pore opening. When the pressure exceeds the pore resistance threshold, the gas is released uniformly in the form of smaller bubbles, achieving a pressurization effect. This forces the microbial ball 6 to have sufficient upward kinetic energy to float in the guide tube 5, or even rise through the guide tube 5.

[0037] The water inlet assembly 3 further includes an inlet pipe 3.2, an inlet valve 3.3, and a distribution pipe 3.4; one end of the inlet pipe 3.2 is connected to the inlet pump 3.1, and the other end is connected to the distribution pipe 3.4; the distribution pipe 3.4 is located at the bottom of the reactor 1, and has multiple outlets thereon to facilitate the uniform flow of nitrogen-containing wastewater; the inlet valve 3.3 is located on the inlet pipe 3.2;

[0038] See Figure 1 The water distribution pipe 3.4, the aeration disc 2.4, and the guide tube 5 are arranged sequentially from bottom to top in the reactor 1. This facilitates uniform mixing of water and air, and allows the influent to float upward along the guide tube 5 under the action of aeration, increasing the contact time and area between the nitrogen-containing wastewater and the microbial balls 6. This not only improves the purification efficiency of nitrogen-containing wastewater but also reduces operating costs.

[0039] The nitrogen-containing wastewater treatment device also includes a drain pipe 7 and a drain valve 8; the drain pipe 7 is connected to the bottom of the reactor 1; the drain valve 8 is installed on the drain pipe 7.

[0040] A water collection tank 9 is installed at the top of the reactor 1. One side of the water collection tank 9 is connected to the nitrogen-containing wastewater in the reactor 1 through an outlet baffle 10, while the other side is connected to an outlet pipe 11. An outlet valve 12 is installed on the outlet pipe 11. The outlet baffle 10 is connected and fixed by a bracket installed on the water collection tank 9. Specifically, the bracket on the water collection tank 9 is vertically installed, and the outlet baffle 10 is inclined towards the outer periphery of the water collection tank 9, forming an acute angle with the bracket to prevent the loss of microbial balls 6. An outlet grid is installed on the outlet baffle 10 to facilitate the blocking of pollutants.

[0041] The main controller 4.1 includes a PLC controller; each of the detection probes 4.2 includes a pH probe, dissolved oxygen probe, temperature probe, ammonia nitrogen probe, total nitrogen probe, COD probe, BOD probe and total phosphorus probe.

[0042] The method for treating nitrogen-containing wastewater using the nitrogen-containing wastewater treatment device is as follows:

[0043] The reactor 1 is fixed to the operating site using a mounting frame;

[0044] The main controller 4.1 starts the water inlet assembly 3 to introduce nitrogen-containing wastewater into the reactor 1 and controls the water inlet flow rate to be 0.2-17 m3 / h; the main controller 4.1 starts the aeration assembly 2 to introduce air into the reactor 1 and controls the air-to-water flow ratio to be 2.5-3.5.

[0045] The main controller 4.1 adjusts the influent flow rate of the influent component 3 and the aeration flow rate of the aeration component 2 in real time based on the information detected and fed back by each detection probe 4.2. If the C / N ratio is lower than 4, a carbon source (specifically sodium acetate) needs to be added to the reactor 1. The added carbon source is used to supplement the organic carbon source required for the denitrification process, provide electron donors for denitrifying bacteria, and promote the production of nitrates (specifically NO in nitrates). 3- The nitrogen is converted into nitrogen (N2) through a denitrification reaction, thereby improving the denitrification efficiency of the system and ensuring that the total nitrogen in the effluent meets the standards.

[0046] The nitrogen-containing wastewater flows through the long flow path formed by the reactor 1 and the guide tube 5, and after being purified by the microbial balls 6, it flows into the water collection tank 9 and flows out through the water outlet pipe 11.

[0047] Example 2:

[0048] Unlike Example 1, see [link to Example 1] Figures 5-6 The reactor 1 is a reaction vessel structure; an observation hole 14 and a manhole 15 are provided on the side wall of the reaction vessel structure; a transparent glass is provided on the observation hole 14 for easy observation; a feeding hole 16 is provided on the top of the reaction vessel structure.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A nitrogen-containing wastewater treatment device, characterized in that, The reactor includes a reactor (1), an aeration assembly (2), an influent assembly (3), and a monitoring assembly (4); a guide tube (5) is coaxially arranged inside the reactor (1); microbial balls (6) are filled inside the reactor (1); the monitoring assembly (4) includes a main controller (4.1) and multiple detection probes (4.2); the main controller (4.1) is located outside the reactor (1), while each of the detection probes (4.2) is located inside the reactor (1); the main controller (4.1) The components are connected to each of the detection probes (4.2) via lines; one end of the water inlet assembly (3) is connected to the nitrogen-containing wastewater, and the other end is connected to the bottom of the reactor (1); the water inlet assembly (3) includes a water inlet pump (3.1) connected to the main controller (4.1); one end of the aeration assembly (2) is connected to air or oxygen, and the other end is connected to the bottom of the reactor (1); the aeration assembly (2) includes a blower (2.1) connected to the main controller (4.1).

2. The nitrogen-containing wastewater treatment device according to claim 1, characterized in that, The axial height of the guide tube (5) is 1 / 2 to 3 / 4 times the axial height inside the reactor (1); the inner diameter of the guide tube (5) is 1 / 4 to 1 / 2 times the inner diameter of the reactor (1); the axial height inside the reactor (1) is 3 to 7 m, and the height-to-diameter ratio is 2 to 6.

3. The nitrogen-containing wastewater treatment device according to claim 1, characterized in that, The diameter of the microbial ball (6) is 3-6 mm.

4. The nitrogen-containing wastewater treatment device according to claim 1, characterized in that, A ladder structure (13) is provided on the side wall inside the reactor (1) from bottom to top.

5. The nitrogen-containing wastewater treatment device according to any one of claims 1 to 4, characterized in that, The aeration assembly (2) further includes an aeration pipe (2.2), an aeration valve (2.3), and an aeration disc (2.4); one end of the aeration pipe (2.2) is connected to the air outlet of the blower (2.1), and the other end is connected to the aeration disc (2.4); the aeration valve (2.3) is disposed on the aeration pipe (2.2); the aeration disc (2.4) is disposed at the bottom of the reactor (1), and includes a main air inlet (2.4.1) and a plurality of pressurized exhaust outlets (2.4.2) arranged circumferentially around the main air inlet (2.4.1); the main air inlet (2.4.1) is connected to the aeration pipe (2.2); each of the pressurized exhaust outlets (2.4.2) is connected to the main air inlet (2.4.1).

6. The nitrogen-containing wastewater treatment device according to claim 5, characterized in that, The water inlet assembly (3) further includes a water inlet pipe (3.2), a water inlet valve (3.3), and a water distribution pipe (3.4); one end of the water inlet pipe (3.2) is connected to the water inlet pump (3.1), and the other end is connected to the water distribution pipe (3.4); the water distribution pipe (3.4) is located at the bottom of the reactor (1), and multiple water outlets are provided thereon; the water inlet valve (3.3) is located on the water inlet pipe (3.2); The water distribution pipe (3.4), the aeration disc (2.4), and the guide tube (5) are arranged sequentially from bottom to top inside the reactor (1); The nitrogen-containing wastewater treatment device also includes a drain pipe (7) and a drain valve (8); the drain pipe (7) is connected to the bottom of the reactor (1); the drain valve (8) is installed on the drain pipe (7).

7. The nitrogen-containing wastewater treatment device according to claim 6, characterized in that, A water collection tank (9) is provided at the top of the reactor (1); one side of the water collection tank (9) is connected to the nitrogen-containing wastewater in the reactor (1) through an outlet baffle (10), and the other side is connected to an outlet pipeline (11); an outlet valve (12) is provided on the outlet pipeline (11); the outlet baffle (10) is connected and fixed by a bracket provided on the water collection tank (9).

8. The nitrogen-containing wastewater treatment device according to claim 7, characterized in that, The reactor (1) includes a top-opening structure with a narrow bottom and a wide top, or a reaction vessel structure; An observation hole (14) and a manhole (15) are provided on the side wall of the reactor structure; a feeding hole (16) is provided on the top of the reactor structure.

9. The nitrogen-containing wastewater treatment device according to claim 8, characterized in that, The main controller (4.1) includes a PLC controller; each of the detection probes (4.2) includes a pH probe, a dissolved oxygen probe, a temperature probe, an ammonia nitrogen probe, a total nitrogen probe, a COD probe, a BOD probe, and a total phosphorus probe.

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