A high ammonia-nitrogen wastewater treatment device

Abstract

The utility model provides a kind of high ammonia nitrogen wastewater treatment device, it is characterized in that, including the pH control area and reaction zone being separated and communicating by partition plate;The device is through the collaborative design of external circulating pump and reactor internal flow channel, to replace traditional mechanical stirring and aeration stirring completely with high-efficiency hydraulic stirring, both solve the technical problem of uneven stirring, also avoid the nitrogen-containing waste gas diffusion problem from the root;Without adding any chemical oxidant, only through electric field effect can drive ammonia nitrogen to occur direct and indirect oxidation reaction on the surface of anode, realize the efficient degradation of ammonia nitrogen;The whole set of device adopts modularization, integration design, significantly reduce the floor area, convenient transportation and installation, reduce equipment maintenance demand and operating cost simultaneously.

Description

Technical Field

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

[0002] With the continuous advancement of industrialization, high-ammonia-nitrogen and high-salinity wastewater discharged from industries such as electroplating, pharmaceuticals, and coking has become a severe challenge for water environment management. This type of wastewater has complex components and poor biodegradability. Traditional biological and physicochemical methods generally face bottlenecks such as low removal rates, long process flows, easy secondary pollution, or high operating costs. Electrocatalytic oxidation technology, as a green and efficient advanced oxidation process, has attracted much attention for its ability to directly degrade ammonia nitrogen. However, its engineering application still has significant drawbacks: existing devices mostly use a combination of mechanical stirring and aeration to achieve fluid mixing, which not only results in high energy consumption and uneven stirring effects but also poses a risk of waste gas leakage. At the same time, low system integration and large footprint lead to increased overall investment and operation and maintenance costs.

[0003] Addressing the technical bottlenecks in current high-ammonia nitrogen wastewater treatment, such as uneven stirring, waste gas emission, frequent maintenance, and low system integration in electrocatalytic oxidation devices, there is an urgent need to develop an integrated treatment device that achieves efficient mass transfer, zero waste gas generation, stable operation, and ease of installation and transportation. Based on this, this invention proposes a high-ammonia nitrogen wastewater treatment device. This device innovatively combines an electrocatalytic oxidation unit with a high-efficiency hydraulic circulation system, constructing an integrated synergistic treatment system of "electric field oxidation - hydraulic stirring - circulation treatment." Through the coordinated design of an external circulation pump and the internal flow channels of the reactor, high-efficiency hydraulic stirring completely replaces traditional mechanical stirring and aeration stirring, solving the technical problem of uneven stirring and fundamentally preventing the emission of nitrogen-containing waste gas. Without the addition of any chemical oxidants, ammonia nitrogen can undergo direct and indirect oxidation reactions on the anode surface solely through the action of an electric field, achieving efficient degradation of ammonia nitrogen. The entire device adopts a modular and integrated design, significantly reducing the footprint, facilitating transportation and installation, and simultaneously lowering equipment maintenance requirements and operating costs. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a high ammonia nitrogen wastewater treatment device, which adopts the following technical solution: The device includes a pH control zone and a reaction zone that are separated and connected by a partition; The pH control zone is equipped with an alkali inlet at the top, which is connected to an alkali inlet pipe extending into the bottom of the pH control zone. The upper side wall of the pH control zone is equipped with a water inlet and a circulating water outlet. The water inlet is connected to an inlet pipe and a second guide pipe, with a dosing pipe connected to the inlet pipe. The second guide pipe extends into the bottom of the pH control zone. The circulating water outlet is connected to a first guide pipe extending into the bottom of the pH control zone. A flow outlet is provided on the partition, which is connected to the bottom of the reaction zone via a third guide pipe. An online pH meter is installed within the pH control zone. The reaction zone is provided with at least one pair of alternating anode plates and cathode plates, forming a serpentine flow channel; the anode plates and cathode plates are respectively connected to a DC power supply through anode connection lines and cathode connection lines; the upper part of the side wall of the reaction zone is provided with an outlet and a circulation inlet, and the circulation inlet is connected to the circulation outlet of the pH control zone through a circulation pump, a circulation inlet pipe and a circulation outlet pipe.

[0005] Furthermore, the distance between the outlet of the first guide pipe and the bottom of the pH control zone is 10-15cm, and the parallel distance between the outlet and the side wall of the pH control zone is 5-10cm.

[0006] Furthermore, the outlet of the second guide pipe is 15-20cm from the bottom of the reaction zone and 10-15cm from the side wall of the reaction zone.

[0007] Furthermore, the outlet of the third guide pipe is 5-10 cm from the bottom of the reaction zone and 5-10 cm from the side wall of the reaction zone.

[0008] Furthermore, the distance between the outlet of the alkali addition tube and the bottom of the pH control zone is 15-20 cm.

[0009] Furthermore, the pH probe of the online pH meter is positioned 30-40 cm vertically below the outlet.

[0010] Furthermore, the bottom of the anode plate is inserted into the bottom of the reaction zone, and the top is 10-20cm away from the top of the reaction zone; the top of the cathode plate is flush with the top of the reaction zone, and the bottom is 10-20cm away from the bottom of the reaction zone; and the distance between the anode plate and the cathode plate is 5-10cm.

[0011] Furthermore, the dosing pipe and the water inlet pipe are connected in a "T" shape.

[0012] Compared with existing technologies, the advantages of this utility model are: (1) No oxidizing agent is required and there is no waste gas leakage. The environment is comfortable and friendly and will not cause harm to human health.

[0013] (2) It saves on building area, has a significant advantage in terms of land area, and has relatively low investment costs.

[0014] (3) This device has a simple structure and is easy to replicate and promote. It can easily meet the treatment needs of both large and small water volumes.

[0015] (4) By adopting hydraulic fluidization, the problem of equipment corrosion was successfully avoided, and the failure rate was greatly reduced.

[0016] (5) It can fully guarantee that the effluent meets the standards, and the ammonia nitrogen in the effluent meets the emission requirements of Zhejiang Provincial Local Standard "Indirect Emission Limits of Nitrogen and Phosphorus Pollutants in Industrial Wastewater" (DB33 / 887-2013, ammonia nitrogen <35 mg / L). Attached Figure Description

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention.

[0018] The components are as follows: 1-Inlet, 2-Dosing pipe, 3-Inlet pipe, 4-Circulation outlet, 5-First guide pipe, 6-Second guide pipe, 7-Alkali inlet, 8-Alkali pipe, 9-Flow outlet, 10-Online pH meter, 11-Baffle, 12-Third guide pipe, 13-Anode plate, 14-Cathode plate, 15-Outlet, 16-Circulation inlet, 17-Inlet pipe, 18-Circulation pump, 19-Circulation outlet, 20-Anode connection wire, 21-Cathode connection wire, 22-DC power supply. Detailed Implementation

[0019] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 and Figure 2 As shown, this utility model provides a high ammonia nitrogen wastewater treatment device, characterized in that it includes a pH control zone and a reaction zone separated and connected by a partition 11; The pH control zone is equipped with an alkali inlet 7 at the top, which is connected to an alkali inlet pipe 8 extending into the bottom of the pH control zone. The upper side wall of the pH control zone is equipped with an inlet 1 and a circulation outlet 4. The inlet 1 is connected to an inlet pipe 3 and a second guide pipe 6. A dosing pipe 2 is connected to the inlet pipe 3, and the second guide pipe 6 extends into the bottom of the pH control zone. The circulation outlet 4 is connected to a first guide pipe 5 extending into the bottom of the pH control zone. The partition 11 is equipped with a flow outlet 9, which is connected to the bottom of the reaction zone via a third guide pipe 12. An online pH meter 10 is installed within the pH control zone. The reaction zone is provided with at least one pair of alternating anode plates 13 and cathode plates 14, forming a serpentine flow channel; the anode plates 13 and cathode plates 14 are respectively connected to the DC power supply 22 through anode connection line 20 and cathode connection line 21; the upper part of the side wall of the reaction zone is provided with an outlet 15 and a circulation inlet 16, and the circulation inlet 16 is connected to the circulation outlet 4 of the pH control zone through a circulation pump 18, a circulation inlet pipe 17 and a circulation outlet pipe 19.

[0021] The outlet of the first guide pipe 5 is 10-15cm away from the bottom of the pH control zone and 5-10cm away from the side wall of the pH control zone.

[0022] The outlet of the second guide pipe 6 is 15-20cm from the bottom of the reaction zone and 10-15cm from the side wall of the reaction zone.

[0023] The outlet of the third guide pipe 12 is 5-10 cm from the bottom of the reaction zone and 5-10 cm from the side wall of the reaction zone.

[0024] The distance between the outlet of the alkali addition pipe 8 and the bottom of the pH control zone is 15-20cm.

[0025] The pH probe of the online pH meter 10 is positioned 30-40 cm vertically below the outlet 9.

[0026] The bottom of the anode plate 13 is inserted into the bottom of the reaction zone, and the top is 10-20cm away from the top of the reaction zone; the top of the cathode plate 14 is flush with the top of the reaction zone, and the bottom is 10-20cm away from the bottom of the reaction zone; and the distance between the anode plate 13 and the cathode plate 14 is 5-10cm.

[0027] The dosing pipe 2 and the water inlet pipe 3 are connected in a "T" shape.

[0028] The processing flow of the device is as follows: High-ammonia nitrogen wastewater first enters the system through inlet 1 via inlet pipe 3. Depending on the water quality, necessary auxiliary chemicals can be added to inlet pipe 3 via dosing pipe 2. The wastewater mixes thoroughly with the effluent from the first guide pipe 5 returning from the circulation outlet 4 within the pH control zone. Simultaneously, newly entering wastewater is directed to the bottom of the pH control zone via the second guide pipe 6 connected to inlet 1. An online pH meter 10 monitors the pH value of the mixture in real time, and alkali solution is automatically added via alkali addition pipe 8 connected to alkali addition port 7, precisely adjusting the wastewater to the optimal reaction pH value.

[0029] The pH-adjusted wastewater enters the bottom of the reaction zone through the flow port 9 on the baffle 11 and the third guide pipe 12. Driven by the circulating pump 18, it flows through a serpentine channel formed by alternating anode plates 13 and cathode plates 14. Each plate is connected to a DC power supply 22 via anode connection line 20 and cathode connection line 21. Under the action of the electric field, the ammonia nitrogen in the wastewater undergoes an electrochemical oxidation reaction on the surface of the anode plate and is efficiently degraded.

[0030] The treated effluent is divided into two parts: the qualified water is discharged through outlet 15; the other part is drawn by circulation pump 18 through circulation inlet 16 and returned to circulation outlet 4 through circulation inlet pipe 17 and circulation outlet pipe 19. The specific installation positions of the first guide pipe 5, the second guide pipe 6 and the third guide pipe 12 in this circulation process and the height difference of the outlet create optimized hydraulic conditions, generating strong hydraulic agitation at the bottom of the pH control zone, completely replacing the traditional mechanical agitation and aeration methods.

[0031] This invention innovatively combines an electrocatalytic oxidation unit with a high-efficiency hydraulic circulation system to construct an integrated synergistic treatment system of "electric field oxidation - hydraulic stirring - circulation treatment". Through the coordinated design of an external circulation pump and the internal flow channel of the reactor, high-efficiency hydraulic stirring completely replaces traditional mechanical stirring and aeration stirring, solving the technical problem of uneven stirring and fundamentally preventing the emission of nitrogen-containing waste gas. Without the addition of any chemical oxidant, ammonia nitrogen can be driven to undergo direct and indirect oxidation reactions on the anode surface solely through the action of the electric field, achieving efficient degradation of ammonia nitrogen. The entire device adopts a modular and integrated design, significantly reducing the footprint, facilitating transportation and installation, and reducing equipment maintenance requirements and operating costs. Example

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0033] A high ammonia nitrogen wastewater treatment device was trial-produced using the above technical solution, such as... Figure 1 .

[0034] The device includes an inlet 1, a dosing pipe 2, an inlet pipe 3, a circulating outlet 4, a first guide pipe 5, a second guide pipe 6, an alkali inlet 7, an alkali pipe 8, an overflow outlet 9, an online pH meter 10, a baffle 11, a third guide pipe 12, an anode plate 13, a cathode plate 14, an outlet 15, a circulating inlet 16, an inlet pipe 17, a circulating pump 18, a circulating outlet pipe 19, an anode connection wire 20, a cathode connection wire 21, and a DC power supply 22.

[0035] The device includes a pH control zone and a reaction zone that are separated and connected by a partition 11; The pH control zone is equipped with an alkali inlet 7 at the top, which is connected to an alkali inlet pipe 8 extending into the bottom of the pH control zone. The upper side wall of the pH control zone is equipped with an inlet 1 and a circulation outlet 4. The inlet 1 is connected to an inlet pipe 3 and a second guide pipe 6. A dosing pipe 2 is connected to the inlet pipe 3, and the second guide pipe 6 extends into the bottom of the pH control zone. The circulation outlet 4 is connected to a first guide pipe 5 extending into the bottom of the pH control zone. The partition 11 is equipped with a flow outlet 9, which is connected to the bottom of the reaction zone via a third guide pipe 12. An online pH meter 10 is installed within the pH control zone. The reaction zone is provided with at least one pair of alternating anode plates 13 and cathode plates 14, forming a serpentine flow channel; the anode plates 13 and cathode plates 14 are respectively connected to the DC power supply 22 through anode connection line 20 and cathode connection line 21; the upper part of the side wall of the reaction zone is provided with an outlet 15 and a circulation inlet 16, and the circulation inlet 16 is connected to the circulation outlet 4 of the pH control zone through a circulation pump 18, a circulation inlet pipe 17 and a circulation outlet pipe 19.

[0036] The outlet of the first guide pipe 5 is 10-15cm away from the bottom of the pH control zone and 5-10cm away from the side wall of the pH control zone.

[0037] The outlet of the second guide pipe 6 is 15-20cm from the bottom of the reaction zone and 10-15cm from the side wall of the reaction zone.

[0038] The outlet of the third guide pipe 12 is 5-10 cm from the bottom of the reaction zone and 5-10 cm from the side wall of the reaction zone.

[0039] The distance between the outlet of the alkali addition pipe 8 and the bottom of the pH control zone is 15-20cm.

[0040] The pH probe of the online pH meter 10 is located 30-40 cm vertically below the outlet (9).

[0041] The bottom of the anode plate 13 is inserted into the bottom of the reaction zone, and the top is 10-20cm away from the top of the reaction zone; the top of the cathode plate 14 is flush with the top of the reaction zone, and the bottom is 10-20cm away from the bottom of the reaction zone; and the distance between the anode plate 13 and the cathode plate 14 is 5-10cm.

[0042] The dosing pipe 2 and the water inlet pipe 3 are connected in a "T" shape.

[0043] A trial production of an ammonia nitrogen wastewater treatment device was conducted at a project site of our company in Ningbo City. The experimental results are as follows: Table 1. Raw water quality 2025.6.25 41625 104084 1.71 For the on-site water sample test conducted on June 25, 2025, a dynamic test was adopted, with the device reaction parameters set at a current density of 70 mA / cm². 2 The water retention time was 10 hours, the reaction pH was set to 8.0~9.0, and samples were taken every 2 hours after the device effluent was discharged to detect the ammonia nitrogen concentration in the supernatant. The experimental data are shown in Table 2.

[0044] Table 2 Dynamic Experimental Data Ammonia nitrogen concentration (mg / L) 20 25 23 20 The results show that in this project, the ammonia nitrogen removal rate of the ammonia nitrogen wastewater treatment device provided by this utility model is as high as 99.9% or more, and the effluent ammonia nitrogen concentration is less than 35 mg / L, which meets the emission requirements of Zhejiang Provincial Local Standard "Indirect Emission Limits for Nitrogen and Phosphorus Pollutants in Industrial Wastewater" (DB33 / 887-2013, ammonia nitrogen <35 mg / L).

[0045] The above-described embodiments are merely illustrative of one implementation of this utility model and are not intended to limit it. It should be noted that those skilled in the art can modify the technical solutions described in the above embodiments or make equivalent substitutions for some or all of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the protection scope of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

Claims

1. A high-ammonia nitrogen wastewater treatment device, characterized in that, It includes a pH control zone and a reaction zone that are separated and connected by a partition (11); The pH control zone is provided with an alkali inlet (7) at the top, and the alkali inlet (7) is connected to an alkali inlet pipe (8) extending into the bottom of the pH control zone; the upper part of the side wall of the pH control zone is provided with an inlet (1) and a circulation outlet (4), the inlet (1) is connected to an inlet pipe (3) and a second guide pipe (6), the inlet pipe (3) is connected to a dosing pipe (2), and the second guide pipe (6) extends into the bottom of the pH control zone; the circulation outlet (4) is connected to a first guide pipe (5) extending into the bottom of the pH control zone; the partition (11) is provided with a flow outlet (9), and the flow outlet (9) is connected to the bottom of the reaction zone through a third guide pipe (12); an online pH meter (10) is provided in the pH control zone. The reaction zone is provided with at least one pair of alternating anode plates (13) and cathode plates (14) to form a serpentine flow channel; the anode plates (13) and cathode plates (14) are respectively connected to a DC power supply (22) through anode connection line (20) and cathode connection line (21); the upper part of the side wall of the reaction zone is provided with an outlet (15) and a circulation inlet (16), and the circulation inlet (16) is connected to the circulation outlet (4) of the pH control zone through a circulation pump (18) via a circulation inlet pipe (17) and a circulation outlet pipe (19).

2. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The outlet of the first guide pipe (5) is 10-15cm away from the bottom of the pH control zone and 5-10cm away from the side wall of the pH control zone.

3. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The outlet of the second guide pipe (6) is 15-20cm from the bottom of the reaction zone and 10-15cm from the side wall of the reaction zone.

4. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The outlet of the third guide pipe (12) is 5-10cm from the bottom of the reaction zone and 5-10cm from the side wall of the reaction zone.

5. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The distance between the outlet of the alkali addition tube (8) and the bottom of the pH control zone is 15-20 cm.

6. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The pH probe of the online pH meter (10) is positioned 30-40 cm vertically below the outlet (9).

7. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The bottom of the anode plate (13) is inserted into the bottom of the reaction zone, and the top is 10-20cm away from the top of the reaction zone; the top of the cathode plate (14) is flush with the top of the reaction zone, and the bottom is 10-20cm away from the bottom of the reaction zone; and the distance between the anode plate (13) and the cathode plate (14) is 5-10cm.

8. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The dosing pipe (2) and the water inlet pipe (3) are connected in a "T" shape.

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