A high-efficiency acid addition aeration and stirring device

Abstract

This utility model discloses a high-efficiency acid-adding aeration and stirring device, including a controller (1) and a closed raw water tank (2). A filter (3) is connected to the top of the raw water tank (2). An inlet pipe (4) and an outlet pipe (5) are respectively provided on both sides of the raw water tank (2). The side wall of the inlet pipe (4) is connected to a dosing pump (7) through an acid-adding pipe (6). A pH probe (8) is provided in the raw water tank (2) above the outlet pipe (5). Both the pH probe (8) and the dosing pump (7) are connected to the controller (1). Multiple partitions (9) are provided in the raw water tank (2). In the direction from the inlet pipe (4) to the outlet pipe (5), the top height of the partitions (9) decreases sequentially. An odd-numbered partition (9) has a gap with the bottom surface of the raw water tank (2), and an even-numbered partition (9) is connected to the bottom surface of the raw water tank (2). This utility model has the advantages of low energy consumption and environmental friendliness.

Description

Technical Field

[0001] This utility model belongs to the field of sewage treatment equipment, and in particular relates to a high-efficiency acid addition, aeration and stirring device used in sewage treatment. Background Technology

[0002] Traditional water utilities typically only supply water, but with industry development, many water utilities now also engage in wastewater treatment projects. MBR (membrane bioreactor) systems are commonly used equipment for wastewater treatment.

[0003] In an MBR system, the pH of the ultrafiltration effluent is between 7.0 and 8.5, while the pH of the nanofiltration and DTRO systems following ultrafiltration needs to be controlled between 6.3 and 6.8 during operation. The water is slightly acidic to avoid scaling of the nanofiltration and DTRO membranes. This requires an acidification device to be installed after ultrafiltration. The ultrafiltration effluent is acidified before entering the nanofiltration and DTRO systems.

[0004] The existing acid addition device includes a raw water tank that receives ultrafiltration effluent. The top of the raw water tank is open. A dosing pump that draws hydrochloric acid from the raw water tank is installed on the raw water tank. A circulation pump is installed on the circulation pipeline of the circulation pump. The dosing pump, circulation pump, and pH probe are all connected to a PLC. The dosing pump draws hydrochloric acid into the raw water tank. The circulation pump drives the water in the raw water tank to circulate, so that the hydrochloric acid is evenly mixed in the water. The pH probe detects the acidity of the water. When the acidity of the water is greater than a certain value, such as 6.7, the PLC turns on the dosing pump to input hydrochloric acid into the raw water tank. When the acidity of the water is less than a certain value, such as 6.4, the PLC turns off the dosing pump and stops adding acid. In short, the dosing pump turns on when the pH is high and turns off when the pH is low, so that the ultrafiltration effluent is reduced to between 6.3 and 6.8.

[0005] During use, it was found that the circulating pump was constantly running, resulting in significant energy consumption. Furthermore, hydrochloric acid is volatile, and the circulation pump's operation caused fluctuations in the water surface, further promoting its volatilization. This volatilization easily accumulates as acid mist above the surface of the raw water tank, which, under the influence of airflow, affects nearby wastewater treatment equipment, leading to increased equipment failure rates and causing environmental pollution. Utility Model Content

[0006] The purpose of this invention is to provide a highly efficient acid-adding aeration and stirring device. This invention has the advantages of low energy consumption and environmental friendliness.

[0007] The technical solution of this utility model is as follows: A high-efficiency acid-adding aeration and stirring device includes a controller and a closed raw water tank. A filter is connected to the top of the raw water tank. An inlet pipe and an outlet pipe are respectively provided on both sides of the raw water tank. The inlet pipe is connected to the top of the raw water tank. The side wall of the inlet pipe is connected to a dosing pump through an acid-adding pipe. The outlet pipe is connected to the bottom of the raw water tank. A pH probe is provided in the raw water tank above the outlet pipe. The pH probe and the dosing pump are both connected to the controller. Multiple baffles are provided in the raw water tank. In the direction from the inlet pipe to the outlet pipe, the top height of the baffles decreases sequentially. An odd-numbered baffle has a gap with the bottom surface of the raw water tank, and an even-numbered baffle is connected to the bottom surface of the raw water tank.

[0008] In the aforementioned high-efficiency acid addition aeration and stirring device, the number of baffles is even.

[0009] In the aforementioned high-efficiency acid aeration and stirring device, the filter includes a housing, one side of which is provided with an air inlet connected to the raw water tank, and the other side of which is provided with an exhaust port. The housing is filled with alkaline material.

[0010] In the aforementioned high-efficiency acid-adding aeration and stirring device, multiple parallel cavities are formed in the raw water tank through multiple baffles in the direction from the inlet pipe to the outlet pipe. The bottom of the even-numbered cavity is provided with an aeration branch pipe, and an aeration main pipe is provided on the outside of the raw water tank. One end of the aeration main pipe is connected to the aeration branch pipe, and the other end of the aeration main pipe is connected to a compressed air source. A valve is provided on the aeration main pipe.

[0011] In the aforementioned high-efficiency acid addition aeration and stirring device, multiple stirring rods are provided above the aeration branch pipe, and one end of the stirring rods is fixed to the partition plate.

[0012] Compared with existing technologies, the raw water tank of this invention adopts a closed structure. By setting multiple baffles with progressively decreasing top heights within the raw water tank, the ultrafiltration effluent repeatedly rises and falls under the influence of gravity. During this repeated upward and downward movement, the hydrochloric acid is uniformly mixed. Since the hydrochloric acid is mixed using the water's own gravity, a circulation pump is unnecessary, resulting in low energy consumption. Furthermore, a filter is installed at the top of the raw water tank, utilizing alkaline materials to absorb acid mist and prevent its leakage from affecting surrounding equipment, thus being environmentally friendly. Therefore, this invention has the advantages of low energy consumption and environmental friendliness.

[0013] Furthermore, by installing multiple stirring rods along the water flow path, the flow of the ultrafiltration effluent is disrupted, further promoting uniform mixing between the ultrafiltration effluent and the acid. Compressed air is introduced into the raw water tank through an aeration pipe, generating bubbles in the water. The buoyancy of these bubbles mixes the hydrochloric acid, and the compressed air creates a slight positive pressure within the raw water tank, promoting the removal of acid mist. Since aeration only serves as an auxiliary mixing mechanism, a lower-power compressed air source can be used. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the filter structure.

[0016] Figure 3 This is the electrical control schematic diagram of this utility model.

[0017] The labels in the attached diagram are as follows: 1-Controller, 2-Raw water tank, 3-Filter, 4-Inlet pipe, 5-Outlet pipe, 6-Acid addition pipe, 7-Dosing pump, 8-pH probe, 9-Baffle plate, 10-Shell, 11-Air inlet, 12-Exhaust outlet, 13-Aeration branch pipe, 14-Aeration main pipe, 15-Compressed air source, 16-Valve, 17-Agitator rod, 18-Seal door. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] Example: A high-efficiency acid-adding aeration and stirring device, such as Figure 1 As shown, it includes a controller 1 and a closed raw water tank 2. The controller 1 is an fx2n type PLC.

[0020] A filter 3 is connected to the top of the raw water tank 2. The filter 3 includes a housing 10. One side of the housing 10 has an air inlet 11 connected to the raw water tank 2, and the other side of the housing 10 has an exhaust port 12. The housing 10 is filled with an alkaline material. The alkaline material can be moist limestone particles, which form a rich porous structure that allows gas to pass through. Preferably, the housing 10 has an openable door for easy replacement of the limestone particles.

[0021] The raw water tank 2 has an inlet pipe 4 and an outlet pipe 5 on its two sides. The inlet pipe 4 is connected to the top of the raw water tank 2. The side wall of the inlet pipe 4 is connected to the dosing pump 7 through the acid addition pipe 6. The outlet pipe 5 is connected to the bottom of the raw water tank 2. The raw water tank 2 has a pH probe 8 located above the outlet pipe 5. The pH probe 8 and the dosing pump 7 are both connected to the controller 1. The raw water tank 2 has four partitions 9. In the direction from the inlet pipe 4 to the outlet pipe 5, the height of the top of the partitions 9 decreases sequentially. There is a gap between the first and third partitions 9 and the bottom surface of the raw water tank 2. The second and fourth partitions 9 are connected to the bottom surface of the raw water tank 2.

[0022] In the direction from the inlet pipe 4 to the outlet pipe 5, five parallel cavities are formed in the raw water tank 2 through four partitions 9. The bottom of the second and fourth cavities is provided with horizontal aeration branch pipes 13. Multiple air holes are provided on the outer circumference of the aeration branch pipes 13. An aeration main pipe 14 is provided on the outside of the raw water tank 2. One end of the aeration main pipe 14 is connected to the aeration branch pipes 13, and the other end of the aeration main pipe 14 is connected to the compressed air source 15. The compressed air source 15 can be a high-pressure blower. A valve 16 is provided on the aeration main pipe 14.

[0023] Multiple stirring rods 17 are provided above the aeration pipe 13, and one end of the stirring rod 17 is fixed to the partition plate 9.

[0024] Preferably, a one-way valve can be installed on the acid addition pipe 6 to prevent water from flowing back into the acid addition pipe 6 from the water inlet pipe 4.

[0025] Working principle: The inlet pipe 4 is connected to the ultrafiltration outlet. The ultrafiltration water enters the raw water tank through the inlet pipe 4, flows up and down, and is discharged from the outlet pipe 5, entering the subsequent nanofiltration or DTRO.

[0026] pH probe 8 detects the pH of the water near the outlet pipe 5 and sends the signal to controller 1. When the pH is below 6.4, controller 1 shuts off the dosing pump 7 to stop adding acid. When the pH is above 6.7, controller 1 turns on the dosing pump 7 to add acid. The hydrochloric acid first mixes with the ultrafiltration water in the inlet pipe 4 and then enters the raw water tank. At a higher flow rate, the mixing effect is improved.

[0027] After the ultrafiltration effluent enters the raw water tank 2, the upper end of the baffle 9 gradually decreases, and under the action of gravity, the water flows vertically back and forth through each baffle 9. During the back and forth flow, the hydrochloric acid is mixed evenly.

[0028] By incorporating the stirring rod 17, turbulence is created as the water flows through, resulting in a more uniform mixing of the hydrochloric acid. The stirring rod 17 is positioned in the second and fourth chambers, rather than the first, third, and fifth chambers, to ensure a smooth downward flow of water and prevent direct overflow from the top of the first, third, and fifth chambers.

[0029] Compressed air enters the bottom of the second and fourth chambers from the aeration main pipe 14 and aeration branch pipe 13. Valve 16 adjusts the air flow rate, and abundant bubbles are formed at the bottom of the second and fourth chambers. The bubbles rise and agitate the water, making the hydrochloric acid more evenly mixed. At the same time, the buoyancy of the bubbles counteracts the upward resistance of the stirring rod 17 to the water flow, ensuring that the water flows smoothly along the predetermined trajectory.

[0030] The acid mist in the raw water tank 2 enters the filter 3 through the air inlet 11 with the airflow. The acid and alkaline materials react and disappear, and the clean airflow leaves the filter 3 through the exhaust port 12.

Claims

1. A high-efficiency acid-adding aeration and stirring device, characterized in that: The system includes a controller (1) and a closed raw water tank (2). A filter (3) is connected to the top of the raw water tank (2). An inlet pipe (4) and an outlet pipe (5) are respectively provided on both sides of the raw water tank (2). The inlet pipe (4) is connected to the top of the raw water tank (2). The side wall of the inlet pipe (4) is connected to the dosing pump (7) through an acid addition pipe (6). The outlet pipe (5) is connected to the bottom of the raw water tank (2). A pH probe (8) is provided in the raw water tank (2) above the outlet pipe (5). The pH probe (8) and the dosing pump (7) are both connected to the controller (1). Multiple partitions (9) are provided in the raw water tank (2). The height of the top of the partitions (9) decreases sequentially in the direction from the inlet pipe (4) to the outlet pipe (5). There is a gap between the odd-numbered partitions (9) and the bottom surface of the raw water tank (2). The even-numbered partitions (9) are connected to the bottom surface of the raw water tank (2).

2. The high-efficiency acid-adding aeration and stirring device according to claim 1, characterized in that: The number of the partitions (9) is even.

3. The high-efficiency acid-adding aeration and stirring device according to claim 1, characterized in that: The filter (3) includes a housing (10), with an air inlet (11) connected to the raw water tank (2) on one side of the housing (10) and an exhaust port (12) on the other side of the housing (10). The housing (10) is filled with alkaline material.

4. The high-efficiency acid-adding aeration and stirring device according to claim 1, characterized in that: In the direction from the inlet pipe (4) to the outlet pipe (5), multiple partitions (9) form multiple parallel cavities in the raw water tank (2). The bottom of the even-numbered cavity is provided with an aeration branch pipe (13). An aeration main pipe (14) is provided on the outside of the raw water tank (2). One end of the aeration main pipe (14) is connected to the aeration branch pipe (13), and the other end of the aeration main pipe (14) is connected to the compressed air source (15). A valve (16) is provided on the aeration main pipe (14).

5. The high-efficiency acid-adding aeration and stirring device according to claim 4, characterized in that: Multiple stirring rods (17) are provided above the aeration pipe (13), and one end of the stirring rod (17) is fixed to the partition (9).

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