Efficient settling pond cleaning system for sewage treatment plant

Abstract

The utility model relates to the technical field of efficient sedimentation tanks, in particular to an efficient sedimentation tank cleaning system for a sewage treatment plant, which comprises a coagulation zone, a flocculation zone and a sedimentation zone. A water inlet control valve is arranged on the water inlet pipeline; an orthophosphate online monitor is mounted in the coagulation area; a cleaning device is arranged below the inclined plate, an online liquid level meter and an online turbidimeter are arranged above the inclined plate, a sludge discharge pump and a sludge discharge control valve are arranged on the sludge discharge pipeline, the cleaning device comprises a first aeration pipe and a second aeration pipe, the first aeration pipe is connected with an air blower, an aeration control valve is arranged on the first aeration pipe, and the second aeration pipe is connected with the air blower. Aeration holes are formed above the second aeration pipe, and all the online monitors and the control elements are connected with a field PLC (Programmable Logic Controller). According to the utility model, the automatic adding of the medicament and the automatic cleaning of the inclined plate can be realized, the hysteretic nature of medicament regulation and control is avoided, the sewage is prevented from flowing into the water outlet channel by regulating and controlling the liquid level during cleaning, and the positive effect on ensuring the water quality of the outlet water of the sedimentation tank is achieved.

Description

Technical Field

[0001] This utility model relates to the field of high-efficiency sedimentation tank technology, specifically to a high-efficiency sedimentation tank cleaning system for sewage treatment plants. Background Technology

[0002] High-efficiency sedimentation tanks are commonly used for tertiary wastewater treatment. Tertiary treatment can more thoroughly remove pollutants such as suspended solids and organic matter from the water, ensuring that the treated water meets national discharge standards. By employing advanced sedimentation technology, sedimentation efficiency can be significantly improved, resulting in more significant treatment effects. Furthermore, they have advantages such as a small footprint, which can greatly reduce the number of treatment equipment required and the area occupied, thereby saving land resources and better meeting the planning and design requirements in the process of urbanization.

[0003] High-efficiency sedimentation tanks require strict control of effluent water quality during use. However, fluctuations in effluent water quality often occur during actual operation. This is due to two main factors: firstly, the effluent water quality is affected by the influent water quality. When the influent water quality fluctuates and downstream control is not timely, effluent water quality will also fluctuate. Secondly, the sedimentation tank itself is affected. Over time, a large amount of sludge accumulates on the inclined plates, severely impacting the sedimentation efficiency. This leads to increased turbidity in the effluent, further affecting its quality. Therefore, certain measures need to be taken in actual production to ensure effluent water quality.

[0004] Regarding fluctuations in influent water quality, the plant currently uses an online orthophosphate monitor, which can effectively detect the orthophosphate content in the influent. However, in actual operation, it is not linked to the dosing pump, and adjustments are often made only after an influent anomaly is detected, resulting in a certain lag. Consequently, untimely adjustments can affect the effluent water quality. As for sludge accumulation on inclined plates, the plant currently uses aeration for cleaning, which does not require emptying the tank and is more efficient and convenient. However, long-term practice has shown that when cleaning by aeration without emptying the tank, some wastewater will flow into the effluent channel due to the turbulence of water in the tank under aeration conditions, which also affects the effluent water quality and causes inconvenience to actual production.

[0005] Therefore, the current problem that needs to be solved is to develop a high-efficiency sedimentation tank that can promptly regulate fluctuations in influent water quality and prevent tank turbulence during the cleaning process of the inclined plates, thereby ensuring stable and effective effluent water quality. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the existing technology by providing a high-efficiency sedimentation tank cleaning system for wastewater treatment plants, so as to ensure stable and effective effluent quality.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: a high-efficiency sedimentation tank cleaning system for a wastewater treatment plant, based on a high-efficiency sedimentation tank, comprising a coagulation zone, a flocculation zone, and a sedimentation zone. An inlet pipe is installed at the front end of the coagulation zone, an inclined plate is installed in the sedimentation zone, and a sludge discharge pipe is installed at the bottom of the sedimentation zone. The sludge discharge pipe is connected to a sludge discharge pump, and a sludge discharge control valve is installed on the sludge discharge pipe. A cleaning device is installed below the inclined plate. An online turbidity meter and an online level gauge are installed in the sedimentation zone, and an inlet control valve is installed on the inlet pipe. The online turbidity meter, online level gauge, inlet control valve, sludge discharge control valve, sludge discharge pump, and cleaning device are all connected to a field PLC.

[0008] Furthermore, the cleaning device includes a first aeration pipe and a second aeration pipe. The first aeration pipe is arranged below the inclined plate, and the second aeration pipe is arranged on both sides of the first aeration pipe. Vertically upward aeration holes are provided on the second aeration pipe. The first aeration pipe is directly or indirectly connected to a blower. An aeration control valve is installed on the first aeration pipe. The aeration control valve and the blower are respectively connected to the on-site PLC.

[0009] Furthermore, an online orthophosphate monitor is installed in the sedimentation zone, and a dosing pipeline is set at the front end of the coagulation zone. A dosing pump is installed on the dosing pipeline, and the dosing pump and the online orthophosphate monitor are respectively connected to the on-site PLC.

[0010] Furthermore, the online turbidity meter and online level meter are installed above the inclined plate in the sedimentation zone.

[0011] Furthermore, agitators are installed in both the coagulation zone and the flocculation zone, and a sludge scraper is installed in the sedimentation zone.

[0012] Furthermore, the agitator in the flocculation zone is located in the guide tube.

[0013] Furthermore, a flocculant delivery pipeline is provided in the flocculation zone, and a flocculant delivery pump is installed on the flocculant delivery pipeline.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model achieves control over the effluent quality of a high-efficiency sedimentation tank through automatic dosing and automatic cleaning, ensuring that the effluent meets discharge standards and playing a positive role in environmental protection.

[0016] 2. By setting up an orthophosphate monitor, this utility model can also detect the water quality in the pool and adjust the dosage of the agent in a timely manner. This not only avoids the lag in regulation and promotes the quality of the effluent, but also helps to save the agent, thereby saving resources and reducing production costs.

[0017] 3. This utility model uses an online level gauge and an online turbidity meter to determine the timing of automatic cleaning by detecting the turbidity of the effluent. After cleaning begins, some sludge is discharged, which on the one hand lowers the height of the liquid level in the tank and prevents sewage from surging into the effluent channel during aeration. On the other hand, the lower sludge level helps the sludge settle, which also plays a positive role in improving cleaning efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main sectional view of the overall structure of the high-efficiency sedimentation tank of this utility model;

[0019] Figure 2 This is a top view schematic diagram of the high-efficiency sedimentation tank of this utility model;

[0020] Figure 3 This is a utility model Figure 1 A magnified view of part A in the diagram.

[0021] The names corresponding to each mark in the diagram:

[0022] 1. Coagulation zone; 11. Inlet pipe; 111. Inlet control valve; 12. Dosing pipe; 121. Dosing pump; 2. Flocculation zone; 3. Sedimentation zone; 31. Inclined plate; 32. Water collection tank; 33. Outlet channel; 34. Cleaning device; 341. First aeration pipe; 342. Second aeration pipe; 343. Aeration control valve; 344. Blower; 35. Sludge discharge pipe; 351. Sludge discharge control valve; 352. Sludge discharge pump; 4. Orthophosphate online monitor; 5. Online level gauge; 6. Online turbidity meter. Detailed Implementation

[0023] 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.

[0024] Embodiments of this utility model:

[0025] like Figure 1-3As shown, in this embodiment, the high-efficiency sedimentation tank includes a coagulation zone 1, a flocculation zone 2, and a sedimentation zone 3 connected in sequence. Agitators are installed in both the coagulation zone 1 and the flocculation zone 2. The agitator in the flocculation zone 2 is located in a guide tube. A flocculant (PAM) delivery pipeline is installed in the flocculation zone 2, and a flocculant delivery pump is installed on the flocculant delivery pipeline. A sludge scraper is installed in the sedimentation zone 3, and an inclined plate 31 is installed in the sedimentation zone 3. A water collection tank 32 is installed above the inclined plate 31 and is connected to the outlet channel 33. A cleaning device 34 is installed below the inclined plate 31. The cleaning device 34 includes a first aeration pipe 341 and a second aeration pipe 342. The first aeration pipe 341 is directly or indirectly connected to a blower 344, and aeration holes are arranged on the second aeration pipe 342, with the aeration holes arranged vertically upward.

[0026] An inlet pipe 11 is provided at the front end of the coagulation zone 1, and an inlet control valve 111 is installed on the inlet pipe 11. A dosing pipe 12 is provided at the front end of the coagulation zone 1, and a dosing pump 121 is installed on the dosing pipe 12. An online orthophosphate monitor 4 is installed in the coagulation zone 1. An online level gauge 5 and an online turbidity meter 6 are installed in the sedimentation zone 3. An aeration control valve 343 is installed on the first aeration pipe 341. A sludge discharge pipe 35 is provided at the bottom of the sedimentation zone 3. The sludge discharge pipe 35 is connected to a sludge discharge pump 352. A sludge discharge control valve 351 is installed on the sludge discharge pipe 35.

[0027] The inlet control valve 111, dosing pump 121, orthophosphate online monitor 4, online level gauge 5, online turbidity meter 6, aeration control valve 343, sludge pump 352, and sludge control valve 351 are all connected to the on-site PLC.

[0028] The principle of this utility model is as follows:

[0029] This invention enables the regulation of effluent water quality through automatic dosing and automatic cleaning. The orthophosphate online monitor 4 monitors the concentration of orthophosphate in the coagulation zone 1 in real time and transmits the monitoring data to the on-site PLC. The on-site PLC regulates the flow rate of the dosing pump 121 in real time, avoiding the lag in regulation, thereby ensuring the effluent water quality and saving chemicals. During the process, the dosing pump 121 is a diaphragm pump used for the quantitative addition of chemicals, and the added chemicals are polyaluminum chloride. In this process, the dosing pump 121 and the orthophosphate online monitor 4 are existing mature equipment, and their structural principles will not be elaborated here. At the same time, the process involves simple signal transmission and control, which are existing mature technologies and are easy for those skilled in the art to understand, so they will not be elaborated here either.

[0030] When the online turbidity meter 6 detects that the turbidity of the effluent has reached the critical value, the signal is transmitted to the local PLC. The local PLC controls the inlet control valve 111 on the inlet pipe 11 to close, stopping the water intake, and controls the sludge discharge control valve 351 on the sludge discharge pipe 35 to open. At the same time, the sludge discharge pump 352 operates to discharge the sludge deposited at the bottom of the sedimentation zone 3. (It should be noted that sludge discharge is also required during normal operation of the sedimentation zone 3, at which time the sludge discharge pump 352 also needs to operate, but this is irrelevant to the technical solution to be protected by this utility model and will not be described further.) During this process, the online level gauge 5 monitors the turbidity in real time. The height of the liquid level in the tank is measured. When the liquid level drops to a certain level (about 20cm), the sludge discharge is stopped. At this time, the sludge discharge pump 352 and the sludge discharge control valve 351 are closed. Then, the on-site PLC controls the aeration control valve 343 and the blower to start. The inclined plate 31 is aerated and cleaned through the second aeration pipe 342. After cleaning for a period of time, the aeration is stopped. After settling for a period of time, the water inlet control valve 111 can be reopened to restore water inlet, thereby realizing the automatic cleaning process of the inclined plate 31. The signal transmission and control involved in the process are existing mature technologies, which are easy to understand for those skilled in the art, and will not be described in detail here.

Claims

1. A high-efficiency sedimentation tank cleaning system for a wastewater treatment plant, based on a high-efficiency sedimentation tank, comprising a coagulation zone (1), a flocculation zone (2), and a sedimentation zone (3) within the high-efficiency sedimentation tank; an inlet pipe (11) is provided at the front end of the coagulation zone (1); an inclined plate (31) is installed in the sedimentation zone (3); a sludge discharge pipe (35) is provided at the bottom of the sedimentation zone (3); the sludge discharge pipe (35) is connected to a sludge discharge pump (352); and a sludge discharge control valve (351) is installed on the sludge discharge pipe (35), characterized in that: A cleaning device (34) is installed below the inclined plate (31), an online turbidity meter (6) and an online level gauge (5) are installed in the sedimentation zone (3), and an inlet control valve (111) is installed on the inlet pipe (11). The online turbidity meter (6), the online level gauge (5), the inlet control valve (111), the sludge discharge control valve (351), the sludge discharge pump (352) and the cleaning device (34) are respectively connected to the on-site PLC.

2. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 1, characterized in that: The cleaning device (34) includes a first aeration pipe (341) and a second aeration pipe (342). The first aeration pipe (341) is arranged below the inclined plate (31), and the second aeration pipe (342) is arranged on both sides of the first aeration pipe (341). Vertical aeration holes are provided on the second aeration pipe (342). The first aeration pipe (341) is directly or indirectly connected to the blower (344). An aeration control valve (343) is installed on the first aeration pipe (341). The aeration control valve (343) and the blower (344) are respectively connected to the field PLC.

3. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 1, characterized in that: An online orthophosphate monitor (4) is installed in the sedimentation zone (3). A dosing pipe (12) is set at the front end of the coagulation zone (1). A dosing pump (121) is installed on the dosing pipe (12). The dosing pump (121) and the online orthophosphate monitor (4) are respectively connected to the on-site PLC.

4. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 1, characterized in that: The online turbidity meter (6) and the online level meter (5) are installed above the inclined plate (31) of the sedimentation zone (3).

5. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 1, characterized in that: Agitators are provided in both the coagulation zone (1) and the flocculation zone (2), and a sludge scraper is provided in the sedimentation zone (3).

6. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 5, characterized in that: The agitator in the flocculation zone (2) is located in the guide tube.

7. The high-efficiency sedimentation tank cleaning system for a wastewater treatment plant according to claim 1, characterized in that: The flocculation zone (2) is equipped with a flocculant delivery pipeline and a flocculant delivery pump is installed on the flocculant delivery pipeline.

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