Flushing device for dephosphorization agent feeding pipeline of sewage treatment plant

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a flushing device for a dephosphorization agent feeding pipeline of a sewage treatment plant, which comprises a first agent storage tank, a second agent storage tank, a communicating pipeline, a first agent feeding pipe, a second agent feeding pipe, a water washing storage tank and an acid pickling storage tank. The first chemical storage tank and the second chemical storage tank are respectively connected with the communicating pipeline, the communicating pipeline is respectively connected with the first chemical feeding pipe and the second chemical feeding pipe, and the first chemical feeding pipe and the second chemical feeding pipe are respectively provided with a chemical feeding pump and a flow indication transmitting instrument; one end of the communicating pipeline is respectively connected with the washing storage tank and the pickling storage tank, and a third control valve is arranged on the communicating pipeline between the first dosing pipe and the second dosing pipe. According to the utility model, on one hand, the daily maintenance of the dosing pipeline can be realized, and on the other hand, the regular maintenance of the dosing pipeline and the cleaning when the dosing pipeline is blocked can also be realized, so that the stable operation of the dosing system is ensured, and the positive effect on ensuring the effluent quality of sewage treatment is achieved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a flushing device for phosphorus removal agent dosing pipelines in wastewater treatment plants. Background Technology

[0002] In wastewater treatment, to ensure effluent quality, phosphorus removal is typically enhanced in advanced treatment units. This involves adding coagulants, such as polyaluminum chloride (PAC), to the high-efficiency sedimentation tank to coagulate phosphorus in the water. Further phosphorus removal is achieved through flocculation and sedimentation, ensuring effluent quality.

[0003] In actual production, chemical dosing is metered into the high-efficiency sedimentation tank using dosing pumps, such as peristaltic pumps. However, due to the long dosing pipeline and slow flow velocity within it, sediment will form on the inner wall of the dosing pipeline during long-term operation of the dosing device. When the sediment accumulates, it will cause blockage of the pipeline, affecting the stable dosing of phosphorus removal agents and consequently affecting the quality of the effluent.

[0004] In the original production practice, the operators used daily water washing to flush the pipes. Flushing alleviated the pipe blockage to some extent, but after the pipes had been running for a long time, blockages would still occur, and the problem was not fundamentally solved. Experimental research showed that the precipitate on the inner wall of the pipes was mostly aluminum hydroxide, which could be effectively removed by soaking in a weak organic acid, achieving a very good removal effect.

[0005] Therefore, this utility model proposes a dosing device for phosphorus removal agent dosing pipeline. Through daily maintenance combined with regular acid cleaning, it effectively avoids blockage of the dosing pipeline, ensures stable operation of the dosing pipeline, and plays a positive role in ensuring the quality of the effluent. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the existing technology by providing a flushing device for phosphorus removal agent dosing pipelines in wastewater treatment plants, so as to clean and maintain the dosing pipelines and ensure the long-term continuous and stable operation of the dosing device.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a flushing device for phosphorus removal agent dosing pipeline in a sewage treatment plant, comprising a first agent storage tank, a water washing tank, and an acid washing tank; the first agent storage tank is connected to a first dosing pipe, a first dosing pump is installed on the first dosing pipe and a first flow indicator transmitter is installed thereon, and the first dosing pipe is connected to the water washing tank and the acid washing tank respectively.

[0008] Furthermore, it also includes a second reagent storage tank, which is connected to the first dosing pipe.

[0009] Furthermore, it also includes a second dosing pipe, which is connected in parallel with the first dosing pipe. The second dosing pipe is connected to the first chemical storage tank, the second chemical storage tank, the water washing tank, and the acid washing tank, respectively. A second dosing pump is installed on the second dosing pipe, and a second flow indicator transmitter is installed on it.

[0010] Furthermore, it also includes a connecting pipeline, wherein the first reagent storage tank is connected to the connecting pipeline through a first liquid outlet pipe, and the second reagent storage tank is connected to the connecting pipeline through a second liquid outlet pipe; the first dosing pipe and the second dosing pipe are respectively connected to the connecting pipeline.

[0011] Furthermore, a first control valve is installed on the first outlet pipe, and a second control valve is installed on the second outlet pipe; a first liquid level indicator transmitter is installed on the first pharmaceutical storage tank, and a second liquid level indicator transmitter is installed on the second pharmaceutical storage tank.

[0012] Furthermore, a third control valve is installed on the connecting pipe between the first dosing pipe and the second dosing pipe.

[0013] Furthermore, one end of the connecting pipe is connected to both the water washing tank and the acid washing tank.

[0014] Furthermore, the connecting pipe is connected to the water washing tank via a water washing pipe; the connecting pipe is connected to the acid washing tank via an acid washing pipe; a fourth control valve is installed on the water washing pipe, and a fifth control valve is installed on the acid washing pipe; a first liquid level indicator is installed on the water washing tank, and a second liquid level indicator is installed on the acid washing tank.

[0015] Furthermore, it also includes a field PLC, wherein the first control valve, the second control valve, the fourth control valve, and the fifth control valve are electric valves; the first liquid level indicator transmitter, the second liquid level indicator transmitter, the first flow indicator transmitter, the second flow indicator transmitter, the first dosing pump, and the second dosing pump are signal inputs of the field PLC, and the first control valve, the second control valve, the fourth control valve, and the fifth control valve are actuators of the field PLC.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model enables daily maintenance of the dosing pipeline by using a water washing tank to flush the dosing pipeline, which plays a positive role in ensuring the long-term stable operation of the dosing pipeline;

[0018] 2. This utility model enables regular maintenance and cleaning of the dosing pipeline when it is blocked, ensuring the stable operation of the dosing system and playing a positive role in ensuring the quality of the treated wastewater.

[0019] 3. This utility model can also be used to repair and handle blockages in the outlet pipe without affecting the continuous operation of the dosing device, making it convenient for use in sewage treatment. 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 PLC control logic of this utility model.

[0022] The names corresponding to each mark in the diagram:

[0023] 1. First chemical storage tank; 11. First level indicator transmitter; 12. First outlet pipe; 121. First control valve; 2. Second chemical storage tank; 21. Second level indicator transmitter; 22. Second outlet pipe; 221. Second control valve; 3. First dosing pipe; 31. First dosing pump; 32. First flow indicator transmitter; 4. Second dosing pipe; 41. Second dosing pump; 42. Second flow indicator transmitter; 5. Connecting pipe; 51. Third control valve; 6. Water washing tank; 61. First level indicator; 62. Water washing pipe; 621. Fourth control valve; 7. Acid washing tank; 71. Second level indicator; 721. Fifth control valve; 8. PLC. Detailed Implementation

[0024] 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 are within the protection scope of the present utility model.

[0025] Embodiments of this utility model:

[0026] like Figure 1 As shown, in this embodiment, two pharmaceutical storage tanks are provided, namely a first pharmaceutical storage tank 1 and a second pharmaceutical storage tank 2. A first liquid level indicator transmitter 11 is provided on the first pharmaceutical storage tank 1, and a second liquid level indicator transmitter 21 is provided on the second pharmaceutical storage tank 2. A first outlet pipe 12 is provided on the first pharmaceutical storage tank 1, and a first control valve 121 is installed on the first outlet pipe 12. A second outlet pipe 22 is provided on the second pharmaceutical storage tank 2, and a second control valve 221 is installed on the second outlet pipe 22. In this embodiment, the pharmaceutical agent in the two pharmaceutical storage tanks is PAC.

[0027] The first outlet pipe 12 and the second outlet pipe 22 are respectively connected to the connecting pipe 5, which is connected to the first dosing pipe 3 and the second dosing pipe 4. A first dosing pump 31 is installed on the first dosing pipe 3, and a first flow indicator transmitter 32 is installed on the first dosing pipe 3. A second dosing pump 41 is installed on the second dosing pipe 4, and a second flow indicator transmitter 42 is installed on the second dosing pipe 4. A third control valve 51 is installed on the connecting pipe 5 between the first dosing pipe 3 and the second dosing pipe 4. In this embodiment, the first dosing pump 31 and the second dosing pump 41 are peristaltic pumps.

[0028] One end of the connecting pipe 5 is connected to the water washing tank 6 and the acid washing tank 7 respectively. The water washing tank 6 is equipped with a first liquid level indicator 61 and is connected to the water washing pipe 62. A fourth control valve 621 is installed on the water washing pipe 62. The acid washing tank 7 is equipped with a second liquid level indicator 71 and is connected to the acid washing pipe. A fifth control valve 721 is installed on the acid washing pipe. The water washing pipe 62 and the acid washing pipe are respectively connected to the connecting pipe 5. In this embodiment, the acid in the acid washing pipe is a weak organic acid, such as formic acid.

[0029] like Figure 2 As shown, a PLC8 is set up on site, wherein the first control valve 121, the second control valve 221, the fourth control valve 621 and the fifth control valve 721 are electric valves, the first liquid level indicator transmitter 11, the second liquid level indicator transmitter 21, the first flow indicator transmitter 32 and the second flow indicator transmitter 42 are the signal inputs of the PLC8, and the first control valve 121, the second control valve 221, the fourth control valve 621, the fifth control valve 721, the first dosing pump 31 and the second dosing pump 41 are the field actuators of the PLC8.

[0030] The principle of this utility model is as follows:

[0031] First, it should be noted that this utility model is installed in two sets on site, one as a backup and one for use, to ensure the stable operation of the dosing device, thereby ensuring the quality of the effluent.

[0032] In use, taking the first reagent storage tank 1 as an example, the first control valve 121 is opened and the second control valve 221 is closed. At this time, the first dosing pump 31 and / or the second dosing pump 41 are started, and the phosphorus removal agent PAC in the first reagent storage tank 1 is transported to the high-efficiency sedimentation tank for coagulation and phosphorus removal. When the agent in the first reagent storage tank 1 is used up, the first control valve 121 is closed and the second control valve 221 is opened, and the agent in the second reagent storage tank 2 is transported to the high-efficiency sedimentation tank. At this time, the agent is replenished in the first reagent storage tank 1. The first reagent storage tank 1 and the second reagent storage tank 2 alternate in a cycle to realize the continuous dosing process of the phosphorus removal agent.

[0033] The water washing tank 6 is used for routine maintenance of the dosing pipeline. During routine maintenance, the first control valve 121 and the second control valve 221 are closed, and the fourth control valve 621, the first dosing pump 31, and the second dosing pump 41 are opened. This allows for flushing of the first dosing pipe 3 and the second dosing pipe 4. The flushing time is short, about 10 minutes, and does not affect the quality of the effluent. A larger flow rate can be used during flushing. The flushing waste liquid is discharged into the waste liquid tank. (Note that the dosing pipeline uses a combination of rigid pipe and flexible hose connection.)

[0034] The pickling storage tank 7 is used for regular maintenance of the dosing pipeline or for cleaning when the pipeline is blocked (when the pipeline is blocked, the flow rate on the dosing pipeline is significantly reduced, prompting on-site personnel to handle it in time). When used for regular maintenance, it can be maintained once a quarter. During maintenance or cleaning, the first control valve 121 and the second control valve 221 are closed, and the fifth control valve 721, the first dosing pump 31 and the second dosing pump 41 are opened to achieve pipeline maintenance or cleaning. The whole process takes a long time, about 1 hour. During this time, the quality of the effluent may be affected. Therefore, the dosing device is switched to the standby dosing device at this time, and the generated flushing waste liquid is discharged into the waste liquid tank.

[0035] During the operation of the device, although the first outlet pipe 12 and the second outlet pipe 22 are relatively short, blockage may still occur during long-term operation. When the flow rate in the first dosing pipe 3 and the second dosing pipe 4 decreases, after the on-site personnel have ruled out the blockage faults in the first dosing pipe 3 and the second dosing pipe 4, they can further determine whether the blockage is in the first outlet pipe 12 or the second outlet pipe 22. When a blockage occurs, the third control valve 51 (the third control valve 51 is a manual valve and is kept open) is closed, and the first outlet pipe 12 or the second outlet pipe 22 can be disassembled and maintained. At this time, the first outlet pipe 12 and the second outlet pipe 22 are maintained separately without switching to the standby device.

[0036] In the implementation of this utility model, it can be used in conjunction with a field PLC8 for control, so as to improve the accuracy and timeliness of regulation and reduce labor intensity. The control logic of the field PLC8 is as described above, which is easy for those skilled in the art to understand, and will not be repeated here.

Claims

1. A flushing device for phosphorus removal agent dosing pipelines in a wastewater treatment plant, characterized in that: The utility model provides a kind of automatic control system of pickling and washing, including first medicament tank (1), water washing tank (6) and pickling tank (7);The first medicament tank (1) is connected with first dosing pipe (3), first dosing pump (31) is provided on first dosing pipe (3) and is equipped with first flow indicating transmitter instrument (32), first dosing pipe (3) is connected with water washing tank (6) and pickling tank (7) respectively.

2. The phosphorus removal agent dosing pipeline flushing device for sewage treatment plants according to claim 1, characterized in that: It also includes second medicament tank (2), and the second medicament tank (2) is connected with the first dosing pipe (3).

3. The phosphorus removal agent dosing pipeline flushing device for a sewage treatment plant according to claim 2, characterized in that: It also includes second dosing pipe (4), and the second dosing pipe (4) is connected with the first dosing pipe (3) in parallel, and the second dosing pipe (4) is connected with the first medicament tank (1), the second medicament tank (2), the water washing tank (6) and the pickling tank (7) respectively, and the second dosing pipe (4) is provided with the second dosing pump (41) and is equipped with the second flow indicating transmitter instrument (42).

4. The phosphorus removal agent dosing pipeline flushing device for sewage treatment plants according to claim 3, characterized in that: It also includes communication pipeline (5), and the first medicament tank (1) is connected with the communication pipeline (5) through the first liquid outlet pipe (12), and the second medicament tank (2) is connected with the communication pipeline (5) through the second liquid outlet pipe (22); the first dosing pipe (3) and the second dosing pipe (4) are connected with the communication pipeline (5) respectively.

5. The device according to claim 4, characterized in that: The first liquid outlet pipe (12) is provided with the first control valve (121), and the second liquid outlet pipe (22) is provided with the second control valve (221); the first medicament tank (1) is provided with the first liquid level indicating transmitter instrument (11), and the second medicament tank (2) is provided with the second liquid level indicating transmitter instrument (21).

6. The phosphorus removal agent dosing pipeline flushing device for sewage treatment plants according to claim 4, characterized in that: The communication pipeline (5) between the first dosing pipe (3) and the second dosing pipe (4) is provided with the third control valve (51).

7. The device according to claim 4, characterized in that: One end of the communication pipeline (5) is connected with the water washing tank (6) and the pickling tank (7) respectively.

8. The device according to claim 7, characterized in that: The communication pipeline (5) is connected with the water washing tank (6) through the water washing pipe (62), and the communication pipeline (5) is connected with the pickling tank (7) through the pickling pipe; the fourth control valve (621) is installed on the water washing pipe (62), and the fifth control valve (721) is installed on the pickling pipe; the first liquid level indicating instrument (61) is installed on the water washing tank (6), and the second liquid level indicating instrument (71) is installed on the pickling tank (7).

9. The dosing pipe flushing device for phosphorus removal reagent of sewage treatment plant according to claims 1-8, characterized in that: It also includes the on-site PLC (8), and the first control valve (121), the second control valve (221), the fourth control valve (621) and the fifth control valve (721) are electric valves; the first liquid level indicating transmitter instrument (11), the second liquid level indicating transmitter instrument (21), the first flow indicating transmitter instrument (32), the second flow indicating transmitter instrument (42), the first dosing pump (31) and the second dosing pump (41) are signal inputs of the on-site PLC (8), and the first control valve (121), the second control valve (221), the fourth control valve (621) and the fifth control valve (721) are execution elements of the on-site PLC (8).

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