Automatic environment-friendly device for reducing total phosphorus

Abstract

The utility model discloses an automatic environment-friendly device for reducing total phosphorus, which comprises a regulating reservoir, a mixing tank, a coagulation tank, a flocculation tank, a precipitator, a neutralizing tank and a filter which are sequentially arranged along the flowing direction of wastewater, a slag discharge pipeline of the precipitator is connected with a filter press, the mixing tank is connected with a lime milk adding device and a pressure reduction adding device, and the neutralizing tank is connected with a filter press. Feeding pipes, discharging pipes and liquid level meters in the mixing tank, the coagulation tank, the flocculation tank and the sedimentation tank are all in control connection with a DCS (Distributed Control System); the mixing tank comprises a tank body, a cover plate mounted at the top of the tank body, and a raw water pipeline and a material distribution pipeline which are mounted on the cover plate, spray holes are uniformly formed in the material distribution pipeline, a driving unit is coaxially and fixedly mounted at the top of the cover plate, an output end of the driving unit is coaxially and fixedly connected with a stirring unit, the stirring unit is coaxial with the tank body, and a liquid discharge pipe is connected to the bottom of the tank body. The effects of reducing the labor intensity of workers and improving the wastewater treatment quality and efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection devices, in particular to an automatic environmental protection device for reducing total phosphorus. Background Art

[0002] In industrial production, the treatment of phosphorus-containing wastewater is a critical environmental task. To ensure that wastewater meets discharge standards, it is typically treated using specialized environmental protection equipment. However, over long-term continuous operation, existing wastewater treatment equipment has exposed significant issues that not only affect treatment effectiveness but also increase operating costs and safety risks.

[0003] 1. High equipment failure rate: Some equipment has a high failure rate, resulting in frequent shutdowns for maintenance. Each startup and shutdown requires manual monitoring, which not only increases the workload of operators but also affects production continuity.

[0004] 2. High operational intensity and safety risks: Daily operations are all performed manually, which is very labor-intensive. Especially in high-intensity work environments, operators are prone to fatigue, increasing the risk of misoperation. In addition, manual operation carries certain safety risks, such as the possibility of accidents caused by equipment misoperation.

[0005] 3. Limited processing capacity: Because the mixing tank must thoroughly mix wastewater, alkali solution, and lime milk and adjust the pH to the desired level, the current unit's processing capacity is only 2 cubic meters per hour. This low wastewater treatment volume per unit time cannot meet the needs of large-scale production. This not only limits production efficiency but can also lead to wastewater backlogs, impacting production schedules. Summary of the Invention

[0006] The technical problems to be solved by the utility model are high equipment failure rate, frequent manual valve switching operations and low efficiency of mixed phosphorus removal in the mixing tank.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: an automated environmental protection device for reducing total phosphorus, comprising a regulating tank, a mixing tank, a coagulation tank, a flocculation tank, a precipitator, a neutralization tank and a filter arranged in sequence along the flow direction of wastewater, wherein the slag discharge pipe of the precipitator is connected to the filter press, the mixing tank is connected to a lime milk adding device and a pressure reducing adding device, and the feed pipes, discharge pipes and liquid level gauges in the mixing tank, the coagulation tank, the flocculation tank and the sedimentation tank are all controlled and connected to the DCS control system;

[0008] The mixing tank includes a tank body, a cover plate installed on the top of the tank body, a raw water pipe and a distribution pipe installed on the cover plate, spray holes are evenly arranged on the distribution pipe, a drive unit is coaxially fixedly installed on the top of the cover plate, the output end of the drive unit is coaxially fixedly connected to the stirring unit, the stirring unit is coaxial with the tank body, and a drain pipe is connected to the bottom of the tank body.

[0009] Preferably, the distribution pipe includes a lime milk pipe and a lye pipe, the lime milk pipe and the lye pipe are vertically arranged on both sides of the interior of the tank body respectively, and the spray holes are evenly arranged on the lime milk pipe and the lye pipe along the axial direction.

[0010] Preferably, the lime milk pipe and the alkali solution pipe are fixedly connected to the inner side wall of the tank body through connecting blocks respectively.

[0011] Preferably, the connecting blocks are axially arranged on the lime milk pipe and the alkali solution pipe, and the connecting blocks are distributed between two adjacent spray holes.

[0012] Preferably, the spray hole penetrates the material distribution pipe in the radial direction.

[0013] Preferably, the stirring unit includes a stirring shaft, a stirring blade fixedly connected to the middle of the stirring shaft, and a stirring disk coaxially fixedly connected to the bottom end of the stirring shaft. The stirring disk is in a frustum shape, and arc-shaped protrusions are evenly arranged on the side walls of the stirring disk.

[0014] Preferably, the drain pipe is located outside the stirring disk.

[0015] 1. The utility model provides an environmental protection device for reducing total phosphorus automatically. Through the distributed control system, all parts of the entire environmental protection device are uniformly controlled, which can facilitate the staff to monitor and control the operation of each section. With the corresponding monitoring instruments, the labor intensity of the staff is reduced while the accuracy of monitoring is improved.

[0016] 2. By improving the mixing tank and replacing the lime milk and alkali solution addition pipes with distribution pipes, the materials can be evenly distributed during feeding. In combination with the stirring unit, the working efficiency of the mixing tank can be improved, thereby improving the production efficiency of the environmental protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a process diagram of the environmental protection device in the embodiment of the present utility model.

[0019] Figure 2 This is a schematic diagram of the internal structure of the mixing tank in an embodiment of the present utility model.

[0020] In the figure: 1. Tank body; 2. Cover plate; 3. Raw water pipe; 4. Lime milk pipe; 5. Alkali liquid pipe; 6. Spray hole; 7. Connecting block; 8. Drain pipe; 9. Drive unit; 10. Agitator shaft; 11. Agitator blade; 12. Agitator plate. DETAILED DESCRIPTION

[0021] like Figure 1 and Figure 2 As shown, the utility model proposes an automated environmental protection device for reducing total phosphorus, comprising a regulating tank, a mixing tank, a coagulation tank, a flocculation tank, a precipitator, a neutralization tank and a filter arranged in sequence along the flow direction of the wastewater, wherein the slag discharge pipe of the precipitator is connected to the filter press, the mixing tank is connected to a lime milk adding device and a pressure reducing adding device, and the feed pipes, discharge pipes and liquid level gauges in the mixing tank, the coagulation tank, the flocculation tank and the sedimentation tank are all controlled and connected to the DCS control system;

[0022] The mixing tank includes a tank body 1, a cover plate 2 installed on the top of the tank body 1, a raw water pipe 3 and a distribution pipe installed on the cover plate 2, and spray holes 6 are evenly arranged on the distribution pipe. A drive unit 9 is coaxially fixedly installed on the top of the cover plate 2, and the output end of the drive unit 9 is coaxially fixedly connected to the stirring unit. The stirring unit is coaxial with the tank body 1, and a discharge pipe 8 is connected to the bottom of the tank body 1.

[0023] Liquid level gauges are installed in the tanks of each section of the environmental protection device to monitor the feeding situation in the tanks. pH detection units are installed in the mixing tank and the neutralization tank. During the phosphorus removal process in the mixing tank, the pH value of the wastewater is observed according to the pH detection unit. The pH value needs to be maintained at 9-11 to ensure the efficiency of phosphorus removal. Similarly, the amount of hydrochloric acid added in the neutralization tank is controlled by the pH detection unit, and the hydrochloric acid dosing device is controlled according to the test results.

[0024] In the regulating tank, the processing volume of the wastewater is adjusted according to the processing capacity of the mixing tank and the concentration of the wastewater, and the set volume of wastewater is transported to the mixing tank. The alkali solution and lime milk are transported to the tank body 1 of the mixing tank through the distribution pipe, and then the driving unit 9 is controlled to drive the stirring unit to stir the wastewater, alkali solution and lime milk. After the wastewater is stirred evenly, it is transported to the coagulation tank. The coagulation tank transports the coagulant into the wastewater through the coagulant adding device. At the same time, the stirring device in the coagulation tank stirs the wastewater and stirs the coagulant evenly in the wastewater. Then the wastewater is transported to the flocculation tank. The coagulant adding device transports the flocculant to the wastewater and further stirs the wastewater. After the stirring is completed, a large number of large alum flowers are formed in the wastewater. The wastewater is then transported to the sedimentator to make the wastewater still so that the alum flowers are precipitated. The upper clear liquid is then transported to the neutralization tank, and hydrochloric acid is added to the neutralization tank for neutralization. After the neutralization of the clear liquid is completed, it is transported to the filter and filtered using a ceramic ultrafiltration membrane. The filtered liquid is discharged or partially recycled. The stratum sediment in the sedimentator is transported to the filter press, which performs filtration to produce filter cakes. The filtrate is transported to the regulating tank for further treatment, and the filter cakes are transported outside.

[0025] like Figure 2As shown, the distribution pipeline includes lime milk pipes 4 and alkali liquid pipes 5, which are arranged vertically on both sides of the tank body 1. The spray holes 6 are evenly distributed along the axial direction on the lime milk pipes 4 and alkali liquid pipes 5. Wastewater is first transported into the tank body 1 through the raw water pipe 3. Then, an addition pump connected to the lime milk tank delivers lime milk through the lime milk pipes 4 into the tank body 1. Then, an addition pump connected to the alkali liquid tank delivers alkali liquid through the alkali liquid pipes 5 into the tank body 1. The evenly distributed spray holes 6 evenly distribute the lime milk and alkali liquid throughout each layer of the tank body 1. Then, the wastewater inside the tank body 1 is agitated to ensure uniform mixing of the wastewater, lime milk, and alkali liquid.

[0026] like Figure 2 As shown, to improve the stability of the lime milk pipe 4 and the alkali liquid pipe 5, the lime milk pipe 4 and the alkali liquid pipe 5 are respectively fixedly connected to the inner wall of the tank body 1 via a connecting block 7. The connecting block 7 supports the lime milk pipe 4 and the alkali liquid pipe 5, preventing them from shaking during the wastewater stirring process.

[0027] like Figure 2 As shown, the lime milk pipe 4 and the alkali liquid pipe 5 are both axially provided with a connecting block 7, which is distributed between two adjacent spray holes 6. After the lime milk pipe 4 and the alkali liquid pipe 5 respectively transport the lime milk and alkali liquid into the wastewater, the separating effect of the connecting block 7 allows the lime milk and alkali liquid to be evenly distributed in each layer of the wastewater, thereby improving the uniformity and efficiency of subsequent mixing.

[0028] like Figure 2 The spray hole 6 penetrates the distribution pipe in a radial direction. During the mixing process of the wastewater, the wastewater will pass through the spray hole 6 and can carry out the lime milk or alkali solution remaining in the distribution pipe, thereby ensuring the uniformity of mixing.

[0029] like Figure 2 As shown. The stirring unit includes a stirring shaft 10, a stirring blade 11 fixedly connected to the middle of the stirring shaft 10, and a stirring disk 12 coaxially fixedly connected to the bottom end of the stirring shaft 10, the stirring disk 12 is in the shape of a truncated cone, and arc-shaped convex pieces are evenly arranged on the side walls of the stirring disk 12. The driving unit includes a stirring motor and a reducer connected in a transmission manner, the reducer is connected to the stirring shaft 10, the stirring blade 11 located in the middle of the stirring shaft 10 stirs the wastewater in the middle, and the stirring disk 12 located at the bottom end of the stirring shaft 10 stirs the wastewater at the bottom, and at the same time, the truncated cone-shaped stirring disk 12 can push the wastewater to surge in the vertical direction, the mounting shaft at the bottom end of the stirring disk 12 is rotatably connected to the inner bottom of the tank body 1, and the bottom end of the stirring shaft 10 is fixedly connected to the top end of the stirring disk 12. This connection method can ensure that the stirring shaft 10 is prevented from bending during high-speed rotation.

[0030] As a preferred embodiment of the present invention, the drain pipe 8 is located outside the stirring disc 12. Since the stirring disc 12 is in a truncated cone shape, the waste water in the tank body 1 can be completely drained from the drain pipe 8 on one side of the stirring disc 12.

Claims

1. An automated environmental protection device for reducing total phosphorus, characterized by: It includes a regulating tank, a mixing tank, a coagulation tank, a flocculation tank, a precipitator, a neutralization tank and a filter arranged in sequence along the flow direction of the wastewater. The discharge pipe of the precipitator is connected to the filter press, the mixing tank is connected to a lime milk adding device and a pressure reducing adding device, and the feed pipes, discharge pipes and liquid level gauges in the mixing tank, coagulation tank, flocculation tank and sedimentation tank are all controlled and connected to the DCS control system; The mixing tank comprises a tank body (1), a cover plate (2) installed on the top of the tank body (1), a raw water pipe (3) and a distribution pipe installed on the cover plate (2), spray holes (6) are evenly arranged on the distribution pipe, a driving unit (9) is coaxially fixedly installed on the top of the cover plate (2), an output end of the driving unit (9) is coaxially fixedly connected to a stirring unit, the stirring unit is coaxial with the tank body (1), and a discharge pipe (8) is connected to the bottom of the tank body (1).

2. The automated environmental protection device for reducing total phosphorus according to claim 1, characterized in that: The distribution pipe comprises a lime milk pipe (4) and a lye pipe (5), the lime milk pipe (4) and the lye pipe (5) are respectively arranged vertically on both sides of the interior of the tank body (1), and the spray holes (6) are evenly arranged on the lime milk pipe (4) and the lye pipe (5) along the axial direction.

3. The automated environmental protection device for reducing total phosphorus according to claim 2, characterized in that: The lime milk pipe (4) and the alkali liquid pipe (5) are respectively fixedly connected to the inner side wall of the tank body (1) through a connecting block (7).

4. The automated environmental protection device for reducing total phosphorus according to claim 3, characterized in that: The connecting blocks (7) are both provided on the lime milk pipe (4) and the alkali solution pipe (5) along the axial direction, and the connecting blocks (7) are distributed between two adjacent spray holes (6).

5. An automated environmental protection device for reducing total phosphorus according to any one of claims 1 to 4, characterized in that: The spray hole (6) penetrates the material distribution pipe in the radial direction.

6. The automated environmental protection device for reducing total phosphorus according to claim 1, characterized in that: The stirring unit comprises a stirring shaft (10), a stirring blade (11) fixedly connected to the middle of the stirring shaft (10), and a stirring disk (12) coaxially fixedly connected to the bottom end of the stirring shaft (10); the stirring disk (12) is in a frustum shape, and arc-shaped protrusions are evenly arranged on the side wall of the stirring disk (12).

7. The automated environmental protection device for reducing total phosphorus according to claim 6, characterized in that: The drain pipe (8) is located outside the stirring disk (12).

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