Automatic sludge discharge sedimentation tank

Abstract

The utility model discloses an automatic sludge discharge sedimentation tank, which relates to the technical field of water treatment and comprises a tank body used for accommodating wastewater; the water pump is connected to the pool body through a pipeline; the overflow weir is located at the edge of the top of the tank body, and a weir plate is arranged at the junction of the overflow weir and the interior of the tank body; the clear water container is located in the pool body, a filter screen is arranged at the top of the clear water container, and a water outlet channel is connected to the bottom of the clear water container; the sludge scraping structure is positioned at the funnel-shaped bottom of the tank body and is matched with a sludge outlet in the bottom of the tank body; the turbidimeter is arranged in the overflow weir; the flow meter is arranged on a pipeline of the water pump; and the controller is electrically connected to the water pump, the turbidimeter and the flow meter. The device can be used for finely controlling the water treatment amount and the precipitation time, and is simple, convenient and efficient in sludge discharge operation.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to an automatic mud discharge sedimentation tank. Background Art

[0002] Water treatment sedimentation is an important water purification technology. It uses the density difference between solid particles and water to separate these particles from the water under the action of gravity to purify the water. Construction wastewater is basically not allowed to be discharged directly into the surrounding water bodies. At present, the main treatment method for construction wastewater in my country is to collect construction wastewater in three-level or multi-level sedimentation tanks, and reuse it for car washing or road sprinkling after simple sedimentation and neutralization treatment. However, traditional sedimentation tanks cannot finely control the amount of treated water and sedimentation time, resulting in unsatisfactory sedimentation effect. The effluent water quality does not meet the water quality requirements of "Urban Wastewater Recycling Urban Miscellaneous Water Quality" (GB / T 18920-2020), and the sludge discharge operation of traditional sedimentation tanks is very complicated. Therefore, a new type of sedimentation tank is urgently needed to ensure the sedimentation effect while simplifying the sludge discharge operation. Utility Model Content

[0003] Technical problems to be solved by utility models

[0004] Aiming at the technical problems that the existing sedimentation devices have unsatisfactory sedimentation effects and the mud discharge operation is complicated and inefficient, the utility model provides an automatic mud discharge sedimentation tank, which can precisely control the amount of processed water and the sedimentation time, and the mud discharge operation is simple and efficient.

[0005] Technical Solution

[0006] In order to solve the above problems, the technical solution provided by the utility model is:

[0007] An automatic mud discharge sedimentation tank comprises a tank body for containing wastewater; a water pump, a pipeline connected to the tank body; an overflow weir, located at the top edge of the tank body, a weir plate is provided at the junction of the overflow weir and the interior of the tank body; a clean water container, located inside the tank body, a filter is provided on the top of the clean water container, and a water outlet channel is connected to the bottom of the clean water container; a mud scraping structure, located at the funnel-shaped bottom of the tank body, cooperating with the mud outlet at the bottom of the tank body; a turbidity meter, arranged in the overflow weir; a flow meter, arranged in the pipeline of the water pump; and a controller, electrically connected to the water pump, the turbidity meter and the flow meter.

[0008] The flow meter transmits the flow value to the controller. When the flow reaches the set value, the controller can turn off the water pump to stop the water intake. The overflow weir is provided with a weir plate to increase the uniformity of the water intake, prevent short-circuiting, and block some suspended matter from entering the sedimentation area. The turbidity meter transmits the turbidity data of the incoming water to the controller, and the controller calculates the required sedimentation time through data processing. After the above-mentioned sedimentation time, the sludge is discharged. The filter can be tightly connected with the outer wall of the clean water container, and can filter some colloids that are difficult to precipitate to improve the water quality of the effluent. The clean water container is used to collect the clean water on the upper part after the wastewater is settled.

[0009] Optionally, the weir plate is a triangular weir plate distributed in a ring shape, wherein the triangular weir plate is provided with a triangular gap for passing waste water and is arranged from bottom to top.

[0010] The triangular gap area of ​​the triangular weir plate is small, which can effectively filter the wastewater preliminarily; at the same time, the flow length is increased and the triangular weir plates are distributed in a ring shape. The completely symmetrical arrangement can effectively increase the uniformity of water inlet.

[0011] Optionally, the scraping structure includes a truss, a drive motor and a scraping blade. The truss includes a transmission shaft located in the center, scraping arms located around it and pull rods connected to the scraping arms. A scraping blade adapted to the funnel-shaped bottom of the pool body is provided under the scraping arm. The drive motor is connected to the transmission shaft, and the scraping blade rotates with the truss.

[0012] When the settled sludge adheres to the inner wall of the sedimentation area, the scraping equipment can be started to clean the sludge stuck on it and assist in automatic sludge discharge without manual sludge discharge.

[0013] Optionally, the top of the transmission shaft is rotatably connected to a fixed structure inside the pool body.

[0014] The top of the transmission shaft is rotatably connected to the fixed structure, which improves the stability of the transmission shaft.

[0015] Optionally, a guide plate is also included, which is connected to the top of the pool body and separates the overflow weir and the clean water container.

[0016] The guide plate can effectively prevent water short-flow, that is, water does not flow along the designed trajectory, but takes a shortcut, thereby improving the sedimentation effect and reducing the volume of the sedimentation tank.

[0017] Optionally, the guide plate is located in the middle of the overflow weir and the clean water container.

[0018] The cross-sectional area of ​​water flow between the guide plate and the inner wall of the sedimentation tank is the same as the cross-sectional area of ​​water flow between the guide plate and the clean water container, avoiding different flow rates on both sides of the guide plate and making the flow velocity on both sides of the guide plate the same to avoid affecting the sedimentation effect due to excessive flow velocity on one side.

[0019] Optionally, a bracket is provided below the cell body, and the bracket is connected to the funnel-shaped bottom of the cell body.

[0020] The brackets provide structural support and allow space underneath the tank for sludge collection.

[0021] Optionally, a rubber support foot and a support leg are connected to the bottom of the bracket, and the rubber support foot and the support leg are fastened together by a nut.

[0022] Each support leg can be independently adjusted in height via a nut, allowing the pool to be level even on uneven ground, and the rubber support feet improve shock absorption.

[0023] Optionally, the bottom of the pool body is funnel-shaped and has an inclination angle of 40° to 80°.

[0024] It is convenient for the sludge to slide down and be discharged from the mud outlet.

[0025] Optionally, a solenoid valve is provided at the mud outlet and is electrically connected to the controller.

[0026] The controller opens the solenoid valve to achieve automatic mud discharge.

[0027] Beneficial Effects

[0028] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0029] The technical solution provided by the utility model includes a tank body; a water pump, the pipeline of which is connected to the tank body; an overflow weir, located at the top edge of the tank body, and a weir plate is provided at the junction of the overflow weir and the interior of the tank body; a clean water container, located inside the tank body, a filter screen is provided on the top of the clean water container, and a water outlet channel is connected to the bottom of the clean water container; a mud scraping structure, located at the funnel-shaped bottom of the tank body, and cooperating with the mud outlet at the bottom of the tank body; a turbidity meter, arranged in the overflow weir; a flow meter, arranged in the pipeline of the water pump; and a controller, electrically connected to the water pump, the turbidity meter and the flow meter. The flow meter transmits the flow value to the controller, and when the flow reaches the set value, the controller can turn off the water pump to stop water intake. The overflow weir is provided with a weir plate to increase the uniformity of water intake, prevent short-flow, and block part of the suspended matter from entering the sedimentation area. The turbidity meter transmits the inlet turbidity data to the controller, and the controller calculates the required sedimentation time through data processing. After the above-mentioned sedimentation time, mud discharge begins. The filter can be tightly fastened to the outer wall of the clean water container, and can filter out some colloids that are difficult to precipitate to improve the quality of the effluent water. The scraping structure includes a truss, a drive motor and a scraping plate. The truss includes a transmission shaft located in the center, scraping arms located around and a pull rod connected to the scraping arm. A scraping plate adapted to the funnel-shaped bottom of the pool body is provided below the scraping arm. The drive motor is connected to the transmission shaft, and the scraping plate rotates with the truss. When the settled sludge adheres to the inner wall of the sedimentation area, the scraping device can be started to clean the sludge adhered to it and automatically discharge the sludge without manual discharge. The sludge discharge operation is simple and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of an automatic mud discharge sedimentation tank proposed in an embodiment of the utility model;

[0031] Figure 2 A schematic diagram of the structure of an overflow weir of an automatic mud discharge sedimentation tank proposed in an embodiment of the utility model;

[0032] Figure 3 A schematic diagram of a structure of a sludge scraping structure of an automatic sludge discharge sedimentation tank proposed in an embodiment of the utility model;

[0033] Figure 4 A schematic structural diagram of a bracket for an automatic mud discharge sedimentation tank proposed in an embodiment of the utility model;

[0034] 1. Water pump; 2. Flow meter; 3. Overflow weir; 31. Triangular weir plate; 4. Turbidimeter; 5. Sedimentation area; 6. Guide plate; 7. Filter; 8. Clean water container; 9. Controller; 10. Solenoid valve; 11. Bracket; 111. Rubber support foot; 112. Nut; 113. Support leg; 12. Truss; 121. Drive motor; 122. Drive shaft; 123. Pull rod; 124. Scraper arm; 125. Scraper blade. DETAILED DESCRIPTION

[0035] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0036] Example

[0037] Combined with Figure 1 , an automatic sludge sedimentation tank, including a tank body for accommodating wastewater; a water pump 1, with a pipeline connected to the tank body; an overflow weir 3, located at the top edge of the tank body, and a weir plate is provided at the junction of the overflow weir 3 and the interior of the tank body; a clean water container 8, located inside the tank body, and a filter screen 7 is provided on the top of the clean water container 8, the filter screen 7 can filter large particles of solid to ensure that the clean water outlet is not blocked, and the filter screen 7 is easy to disassemble and clean and replace, the filter screen 7 is tightly fitted to the outer wall of the clean water container 8 through a longer metal clamp, the filter screen 7 is a multi-layer dense metal mesh, which can filter some colloids that are difficult to precipitate to improve the water quality of the effluent, and the filter screen 7 is easy to disassemble and clean. The bottom of the clean water container 8 is connected to a water outlet channel; a mud scraping structure is located at the funnel-shaped bottom of the pool body and cooperates with the mud outlet at the bottom of the pool body; a turbidity meter 4 is arranged in the overflow weir 3; a flow meter 2 is arranged in the pipeline of the water pump 1; a controller 9 is electrically connected to the water pump 1, the turbidity meter 4 and the flow meter 2.

[0038] The body of the sedimentation tank is made of stainless steel and is circular in shape. The ratio of the diameter to the depth of the tank body is 2:1 to 3:1, and the super height is 0.3m. The ratio of the diameter of the clean water container 8 to the diameter of the tank body is 1:4, and the bottom of the clean water container 8 is conical and has an inclination angle of 30°. The bottom of the sedimentation area 5 is conical and has an inclination angle of 40°, 60° or 80°. The precipitated particles can gather at the bottom of the sedimentation area 5, and a scraper structure is provided to assist in mud discharge. The diameter of the mud discharge pipe is 100mm.

[0039] The flow meter 2 transmits the flow value to the controller 9. When the flow reaches the set value, the controller 9 can turn off the water pump 1 to stop the water intake. The overflow weir 3 is provided with a triangular weir plate 31 to increase the uniformity of the water intake, prevent short-flow, and block some suspended matter from entering the sedimentation area 5. The turbidity meter 4 transmits the turbidity data of the incoming water to the controller 9, and the controller 9 calculates the required sedimentation time through data processing. The guide plate 6 can effectively prevent water short-flow, improve the sedimentation effect and reduce the volume of the sedimentation tank. After the above-mentioned sedimentation time, the controller 9 opens the sludge solenoid valve 10 to realize automatic sludge discharge. The filter screen 7 can be tightly connected with the outer wall of the clean water container 8, and can filter out some colloids that are difficult to precipitate to improve the water quality of the effluent.

[0040] Combined with Figure 2 The weir plate is a triangular weir plate 31 distributed in a ring shape. The triangular weir plate 31 is provided with a triangular gap for passing wastewater and is arranged from bottom to top. When the water is lower than the weir top, the water will not flow through. At this time, the weir only serves to block the water. When the water continues to flow, the triangular weir plate 31 raises the water level. When the water level is higher than the weir top, the water overflows from the weir top. The water passes through the triangular weir plate 31 through the lifting and blocking effect, blocking some impurities in front of the triangular weir plate 31. The water flowing through the triangular weir plate 31 is relatively clean, achieving the purpose of preliminary water purification. At the same time, the increase in the flow length and the completely symmetrical arrangement of the triangular weir plates 31 can effectively increase the uniformity of water inlet.

[0041] The inlet flow rate Q can be calculated by the following formula: The inlet load is not more than 1.7L / (m·s).

[0042] Q=α*L

[0043] Where:

[0044] Q——water inlet flow, L / s.

[0045] α——water inlet load, L / (m·s).

[0046] L——Length of overflow weir 3, m.

[0047] The flow meter 2 transmits the flow value to the controller 9. When the water volume reaches 10 cubic meters, the controller 9 can turn off the water pump 1 to stop the water intake. The water intake load is controlled to be 1.5L / (m·s). The NTU (Nephelometric Turbidity Units) turbidity of the incoming water is 8000. The turbidity meter 4 transmits the incoming water turbidity data to the controller 9. The controller 9 calculates the required sedimentation time to be 6h through data processing. The guide plate 6 can effectively prevent water short-flow, improve the sedimentation effect and reduce the volume of the sedimentation tank. After the above-mentioned sedimentation time, the controller 9 opens the solenoid valve 10 to realize automatic sludge discharge, and the sludge discharge time is set to 10min. The treated clean water can be reused for car washing and road sprinkling. The wastewater reuse rate in the whole process can reach more than 90%, and one cycle can save 9 cubic meters of water.

[0048] The calculation of wastewater settling time usually involves the consideration of multiple factors, including wastewater characteristics, settling tank design, treatment objectives, etc. In actual operation, the controller 9 (such as PLC, DCS or other intelligent control systems) dynamically adjusts or predicts the settling time through built-in algorithms and programs combined with field sensor data. The following are the steps and methods for generally calculating or determining wastewater settling time, and the controller 9 will be programmed according to these principles:

[0049] Wastewater characteristics analysis:

[0050] Properties of suspended matter: particle size, shape, density, and whether it is easy to flocculate directly affect the sedimentation rate.

[0051] Wastewater flow rate: The influent flow rate determines the loading of the sedimentation tank and affects the opportunities for particle collision and flocculation.

[0052] Wastewater temperature: Temperature affects the speed of Brownian motion of particles, and low temperature is conducive to precipitation.

[0053] Chemical parameters such as pH and conductivity: may affect the charge state of suspended matter and the flocculation effect.

[0054] Sedimentation tank design parameters:

[0055] Pool type: Different pool types such as horizontal flow, vertical flow, radial flow, etc. have different effects on sedimentation efficiency.

[0056] Surface load: The volume of wastewater treated per unit area per hour, which affects the sedimentation rate and effect.

[0057] Water depth: The time required for particles to settle varies in sedimentation tanks of different depths.

[0058] Residence time: Calculated based on the design flow rate and pool capacity, and is the basis for determining sedimentation time.

[0059] Processing target:

[0060] Effluent turbidity requirements: Set target turbidity according to discharge standards or reuse requirements, which affects the required sedimentation time.

[0061] Sludge treatment requirements: Considering factors such as sludge production and dewatering performance, it may be necessary to adjust the settling time to optimize the sludge properties.

[0062] In actual application, the controller 9 does not directly "calculate" the settling time, but adjusts and controls it through a preset control logic or model based on the above factors and real-time monitoring data (such as inlet flow, turbidity, temperature, etc.). The following is an example of how to achieve settling time control through the controller 9:

[0063] Based on turbidity feedback control: The controller 9 continuously monitors the turbidity of the effluent from the sedimentation tank. When the effluent turbidity approaches or exceeds the set threshold, the sedimentation time is extended, otherwise it is appropriately shortened. This requires the installation of an online turbidity sensor and the setting of a suitable PID (proportional-integral-differential) or other control algorithm.

[0064] Calculation based on flow and residence time: The controller 9 calculates the theoretical residence time based on the influent flow and the sedimentation tank volume, and dynamically adjusts it in combination with the actual sedimentation effect (such as turbidity, SS concentration, etc.). For example, when the influent flow increases, the residence time may need to be increased to ensure the sedimentation effect.

[0065] Model-based predictive control: A more advanced controller 9 may use a sedimentation model that, based on wastewater characteristics and sedimentation tank parameters, can predict the required sedimentation time under given conditions. The controller 9 adjusts the sedimentation time based on the model output and real-time monitoring data to achieve the optimal treatment effect.

[0066] In summary, the controller 9 integrates information such as wastewater characteristics, sedimentation tank design parameters, and treatment objectives, combines real-time monitoring data, and uses preset control logic or models to achieve effective control of wastewater sedimentation time. In actual operation, the controller 9 may also need to consider other factors, such as seasonal changes, equipment status, etc., and have certain self-learning and self-adaptive capabilities to cope with fluctuations in wastewater characteristics and changes in treatment requirements.

[0067] Combined with Figure 3 The scraping structure includes a truss 12, a driving motor 121 and a scraping blade 125. The truss 12 includes a transmission shaft 122 located in the center, scraping arms 124 located around and a pull rod 123 connected to the scraping arm 124. A scraping blade 125 adapted to the funnel-shaped bottom of the tank body is provided below the scraping arm 124. The driving motor 121 is connected to the transmission shaft 122, and the scraping blade 125 rotates with the truss 12. The driving motor 121 is located below the sedimentation tank and fixed on the outer wall of the sedimentation tank; the upper and lower ends of the transmission shaft 122 are fixed with mechanical seal bearings respectively, and the entire transmission shaft 122 rotates in a circle with the center of the circle, and the scraping blade 125 is fixed on the scraping arm 124. When the precipitated sludge adheres to the inner wall of the sedimentation area 5, the driving motor 121 can be started to clean the sludge adhered thereto and assist in mud discharge.

[0068] The top of the transmission shaft 122 is rotatably connected to the fixed structure inside the pool body. The fixed structure is the bottom of the clean water container 8, and the clean water container 8 itself can be fixedly connected to the inside of the pool body through a connecting rod or the like.

[0069] The guide plate 6 is connected to the top of the tank body, separating the overflow weir 3 and the clean water container 8. The guide plate 6 is located in the middle of the overflow weir 3 and the clean water container 8. The water flow cross-sectional area between the guide plate 6 and the inner wall of the sedimentation tank is the same as the water flow cross-sectional area between the guide plate 6 and the clean water container 8.

[0070] Combined with Figure 4 A bracket 11 is provided below the pool body, and the bracket 11 is connected to the funnel-shaped bottom of the pool body. A rubber support foot 111 and a support leg 113 are connected to the bottom of the bracket 11, and the rubber support foot 111 and the support leg 113 are fastened together by a nut 112. The rubber support foot 111 and the support leg 113 are sleeved, and the support height is adjusted by the nut 112 to adapt to uneven ground.

[0071] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An automatic mud discharge sedimentation tank, characterized in that: include A tank body for containing wastewater; A water pump, with a pipeline connected to the tank body; An overflow weir is located at the top edge of the pool body, and a weir plate is provided at the junction of the overflow weir and the interior of the pool body; A clean water container is located inside the pool body, a filter screen is provided on the top of the clean water container, and a water outlet channel is connected to the bottom of the clean water container; A mud scraping structure, located at the funnel-shaped bottom of the pool body and cooperating with a mud outlet at the bottom of the pool body; a turbidity meter, disposed in the overflow weir; A flow meter, arranged in the pipeline of the water pump; A controller is electrically connected to the water pump, the turbidity meter and the flow meter.

2. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: The weir plate is a triangular weir plate distributed in a ring shape, wherein the triangular weir plate is provided with a triangular gap for passing waste water and is arranged from bottom to top.

3. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: The scraping structure includes a truss, a driving motor and a scraping blade. The truss includes a transmission shaft located in the center, scraping arms located around it and pull rods connected to the scraping arms. A scraping blade adapted to the funnel-shaped bottom of the pool body is provided under the scraping arm. The driving motor is connected to the transmission shaft, and the scraping blade rotates with the truss.

4. The automatic mud discharge sedimentation tank according to claim 3, characterized in that: The top of the transmission shaft is rotatably connected to a fixed structure inside the pool body.

5. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: It also includes a guide plate, which is connected to the top of the pool body and separates the overflow weir and the clean water container.

6. The automatic mud discharge sedimentation tank according to claim 5, characterized in that: The guide plate is located in the middle of the overflow weir and the clean water container.

7. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: A bracket is provided below the pool body, and the bracket is connected to the funnel-shaped bottom of the pool body.

8. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: The bottom of the pool body is funnel-shaped and has an inclination angle of 40° to 80°.

9. The automatic mud discharge sedimentation tank according to claim 1, characterized in that: A solenoid valve is provided at the mud outlet and is electrically connected to the controller.

Images