Automatic skimming system for secondary sedimentation tank of municipal sewage treatment

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a kind of municipal sewage treatment secondary sedimentation tank automatic skimming system, comprising: discharge device, control device and the mud scraper device electrically connected with control device;The mud scraper device includes the pedestal being set in the center of secondary sedimentation tank, and the mud scraper being set on pedestal;Control device includes the main control unit being set close to the outer wall of secondary sedimentation tank, the inductive sheet being set on mud scraper, the inductor being set on the end surface of secondary sedimentation tank and close to discharge device;Pedestal mud scraper is rotated based on pedestal, when inductive sheet is close to inductor, starting controller will float dross and float mud of secondary sedimentation tank be sucked into discharge device;Through the synergistic effect of discharge device, control device and mud scraper device, float mud and float dross are excluded, effectively reduce the pool surface float mud floating rate in secondary sedimentation tank.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an automatic slag skimming system for secondary sedimentation tanks in municipal wastewater treatment. Background Technology

[0002] Due to aging and disintegration of sludge, high levels of suspended solids in the wastewater, and uneven sludge settling, a large amount of floating mud and foam are scattered on the surface of the secondary sedimentation tank. The existing skimming port is generally higher than the water surface, and the floating mud is scraped to the skimming port by a sludge scraper and then discharged. However, the existing sludge scraper and skimming port are not very effective in cleaning floating mud, resulting in a large amount of floating mud overflowing into the effluent channel through the cofferdam, which can easily cause the effluent to exceed the standard. The large amount of floating mud and foam on the surface of the secondary sedimentation tank greatly affects the sensory experience of the secondary sedimentation tank.

[0003] To address this deficiency, existing technologies CN120037701A discloses a scum discharge device and scum cleaning system for secondary sedimentation tanks, and CN207012621U discloses a scum collection device for the surface of secondary sedimentation tanks. Both devices achieve scum discharge through nozzles. The former achieves scum removal by creating a liquid level difference and the gravitational effect of the scum mixture; the latter uses nozzles to simulate "artificial rain" to disperse and sink the scum and mud on the surface of the tank, pushing the scum and mud to the edge of the tank, where it is automatically removed by passing through a scum hopper along with a skimming plate. However, this approach still has certain limitations. The nozzles require a continuous water supply, increasing energy and water consumption. Furthermore, this approach results in higher maintenance costs, as the nozzles are prone to clogging and require regular cleaning and maintenance, making inspection difficult and reducing environmental benefits. Utility Model Content

[0004] To address the technical problems of high energy consumption, poor environmental benefits, and inconvenient maintenance associated with existing devices for removing scum and sludge, the purpose of this utility model is to provide an automatic scum skimming system for secondary sedimentation tanks in municipal wastewater treatment. The specific technical solution adopted is as follows:

[0005] The system includes a discharge device, a control device, and a sludge scraping device electrically connected to the control device; the sludge scraping device includes a base disposed at the center of the secondary sedimentation tank and a sludge scraper disposed on the base; the control device includes a main controller disposed near the outer wall of the secondary sedimentation tank, a sensor disposed on the sludge scraper, and a sensor disposed on the end face of the secondary sedimentation tank and near the discharge device.

[0006] The base scraper rotates based on the base. When the sensing plate approaches the sensor, the main controller is activated to suck the scum and sludge from the secondary sedimentation tank into the discharge device.

[0007] Preferably, the main controller includes an electrical control box, an electric valve, and a time relay installed in the electrical control box. When the electric valve is activated, the time relay starts timing.

[0008] Preferably, the timing range of the time relay and / or the working time of the electric valve is 1 min to 30 min.

[0009] Preferably, baffles are provided at intervals on the inner wall near the secondary sedimentation tank, and the discharge device includes a slag skimming port provided near the baffles and a slag discharge pipe provided along the slag skimming port.

[0010] Preferably, the sensor is positioned at an angle of 15°-30° between the scraping direction of the sludge scraper and the skimming port.

[0011] Preferably, the height of the skimming port is less than the liquid level in the secondary sedimentation tank.

[0012] Preferably, the length of the sludge scraper is less than the diameter of the secondary sedimentation tank, but greater than the diameter of the baffle after it is surrounded.

[0013] This utility model has the following beneficial effects:

[0014] Through the coordinated action of the discharge device, control device, and sludge scraping device, floating sludge and scum are removed, effectively reducing the floating sludge rate on the surface of the secondary sedimentation tank. Specifically, when the sludge scraper rotates and the induction plate and sensor approach each other, the main controller is activated to suck the floating scum and sludge in the secondary sedimentation tank into the discharge device using the siphon principle, ensuring that the effluent meets the standards. In addition, the main controller, sensor, and induction plate are not located inside the secondary sedimentation tank, which not only facilitates maintenance but also avoids interference with the environment inside the secondary sedimentation tank. Attached Figure Description

[0015] To more clearly illustrate the technical solutions and advantages in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a top view of an automatic skimming system for a secondary sedimentation tank in municipal wastewater treatment, provided in one embodiment of the present invention.

[0017] Figure 2 A cross-sectional view of an automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment, provided in one embodiment of this utility model;

[0018] In the picture:

[0019] 1. Discharge device; 2. Control device; 3. Sludge scraping device; 4. Secondary sedimentation tank; 5. Walkway slab;

[0020] 10. Skimming port; 11. Slag discharge pipe; 20. Main controller; 21. Electrical control box; 22. Electric valve; 30. Base; 31. Sludge scraper. Detailed Implementation

[0021] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of an automatic skimming system for secondary sedimentation tanks in municipal wastewater treatment according to this utility model. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] The following describes in detail, with reference to the accompanying drawings, the specific scheme of the automatic slag skimming system for secondary sedimentation tanks in municipal sewage treatment provided by this utility model.

[0024] Please combine Figure 1 and Figure 2 The diagram shows a top view and a cross-sectional view of an automatic skimming system for a secondary sedimentation tank in municipal wastewater treatment, provided in the first embodiment of this utility model, including:

[0025] The system includes a discharge device 1, a control device 2, and a sludge scraping device 3 electrically connected to the control device 2. The sludge scraping device 3 includes a base 30 located at the center of the secondary sedimentation tank 4 and a sludge scraper 31 located on the base 30. The control device 2 includes a main controller 20 located near the outer wall of the secondary sedimentation tank 4, a sensor plate located on the sludge scraper 31, and a sensor located on the end face of the secondary sedimentation tank 4 and near the discharge device 1. The base 30 and the sludge scraper 31 rotate based on the base 30. When the sensor plate approaches the sensor, the main controller is activated to suck the scum and sludge of the secondary sedimentation tank 4 into the discharge device 1.

[0026] To better illustrate, the secondary sedimentation tank 4 is used for sedimentation and separation of sewage, so that solid particles and some organic matter in it are settled to the bottom of the tank, thereby purifying the sewage. However, during the process, due to various reasons, some solid particles and organic matter may float on the water surface, forming scum and sludge. In addition, factors such as the concentration of suspended solids, temperature, and pH value in the sewage will also affect the formation of scum and sludge. If the scum and sludge are not discharged in time, they will accumulate, affecting the operation and management of the secondary sedimentation tank 4, and thus reducing the sewage treatment effect.

[0027] The sensor plate and the sensor work together to trigger the main controller 20 to start, thereby controlling the operation of the entire automatic slag skimming system. The sensor is installed on the end face of the secondary sedimentation tank 4, that is, on the walkway plate 5 of the secondary sedimentation tank 4, to cooperate with the sensor plate. Preferably, the sludge scraper 31 is a center-driven sludge scraper 31 arm, which fully covers the entire surface of the secondary sedimentation tank 4. The scum and sludge are scraped and collected to the discharge device 1 by the sludge scraper 31 arm, thereby improving the sewage treatment effect.

[0028] Furthermore, the main controller 20 includes an electrical control box 21, an electric valve 22, and a time relay installed in the electrical control box 21. When the electric valve 22 is activated, the time relay starts timing.

[0029] Furthermore, the timing range of the time relay and / or the operating time of the electric valve 22 is 1 min to 30 min.

[0030] Specifically, when the scraper 31 reaches the predetermined position, that is, when the sensor on the scraper 31 approaches or overlaps with the sensor on the walkway 5, at this time, when the scum and sludge on the surface of the pool are about to reach the discharge device 1, the electric valve 22 is activated, using the siphon principle to suck the scum and sludge from the secondary sedimentation tank 4 into the discharge device 1; at the same time, the time relay starts timing synchronously, setting the opening time of the electric valve 22 to 1-30 minutes. After the timing ends, the electric valve 22 is closed, completing one sludge discharge action. When the scraper 31 approaches the sensor again... When the device is activated, the floating sludge removal process is repeated. Optionally, during the entire floating sludge removal process, the opening and closing time of the electric valve 22 can be controlled by a time relay cycle control function. When there is a large amount of floating sludge, i.e., when it covers more than 85% of the pool surface, a sludge removal time of 30 minutes is set, and the time should not be too long to prevent affecting the treatment volume. After 24 hours of circulation, when the pool surface coverage rate drops to 10%, the sludge removal time is adjusted to 10 minutes. In addition, if there are any abnormalities in the floating sludge on the pool surface during the inspection, the sludge removal time can be adjusted at any time.

[0031] Furthermore, baffles are provided at intervals on the inner wall near the secondary sedimentation tank 4, and the discharge device 1 includes a slag skimming port 10 provided near the baffles and a slag discharge pipe 11 provided along the slag skimming port 10; that is, the direction of water flow is guided and controlled by the baffles; preferably, in practical applications, a coarse grid is provided at the slag skimming port 10 to improve the smoothness of the operation of the discharge device 1, reduce the risk of blockage of the slag discharge pipe 11, and extend the service life of the slag discharge pipe 11.

[0032] Furthermore, the sensor is positioned at an angle of 15°-30° between the sludge scraping direction of the sludge scraper 31 and the slag skimming port 10; that is, when the sensing plate on the sludge scraper 31 approaches the slag skimming port 10, it simultaneously approaches the sensor to improve the wastewater treatment efficiency.

[0033] Furthermore, the height of the skimming port 10 is less than the liquid level of the secondary sedimentation tank 4; this ensures that the skimming port 10 can work effectively while avoiding unnecessary interference with the liquid level of the secondary sedimentation tank 4.

[0034] Furthermore, the length of the sludge scraper 31 is less than the diameter of the secondary sedimentation tank 4, but greater than the diameter after the baffle is wrapped around it. This arrangement ensures that the large arm of the sludge scraper 31 can operate flexibly in the tank, and that the sludge scraper 31 can cover the entire baffle area, effectively scraping the sludge from the surface of the tank into the skimming port 10, and discharging it through the sludge discharge pipe 11.

[0035] Understandably, through the coordinated action of the discharge device 1, control device 2, and sludge scraping device 3, floating mud and scum are removed, effectively reducing the floating mud rate on the surface of the secondary sedimentation tank 4. That is, when the sludge scraper 31 rotates and the sensing plate and sensor approach each other, the main controller is activated to suck the scum and mud in the secondary sedimentation tank 4 into the discharge device 1 using the siphon principle, so as to ensure that the effluent meets the standards. In addition, the main controller 20, sensor, and sensing plate are not installed in the secondary sedimentation tank 4, which not only facilitates maintenance but also avoids interference with the environment inside the secondary sedimentation tank 4.

[0036] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0037] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. An automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment, characterized in that, include: The system includes a discharge device, a control device, and a sludge scraping device electrically connected to the control device; the sludge scraping device includes a base disposed at the center of the secondary sedimentation tank and a sludge scraper disposed on the base; the control device includes a main controller disposed near the outer wall of the secondary sedimentation tank, a sensor disposed on the sludge scraper, and a sensor disposed on the end face of the secondary sedimentation tank and near the discharge device. The base scraper rotates based on the base. When the sensing plate approaches the sensor, the main controller is activated to suck the scum and sludge from the secondary sedimentation tank into the discharge device.

2. The automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 1, characterized in that, The main controller includes an electrical control box, an electric valve, and a time relay installed in the electrical control box. When the electric valve is activated, the time relay starts timing.

3. The automatic sludge skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 2, characterized in that, The timing range of the time relay and / or the working time of the electric valve is 1 min to 30 min.

4. The automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 1, characterized in that, Baffles are spaced apart on the inner wall near the secondary sedimentation tank. The discharge device includes a skimming port near the baffles and a discharge pipe along the skimming port.

5. An automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 4, characterized in that, The sensor is positioned at an angle of 15°-30° between the scraping direction of the sludge scraper and the skimming port.

6. The automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 4, characterized in that, The height of the skimming port is less than the liquid level in the secondary sedimentation tank.

7. An automatic slag skimming system for a secondary sedimentation tank in municipal wastewater treatment according to claim 4, characterized in that, The length of the sludge scraper is less than the diameter of the secondary sedimentation tank, but greater than the diameter of the baffle after it is surrounded.

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