Supernatant Collection Device and Its Operation Method

Abstract

This disclosure relates to the field of water resource recycling, and more particularly to a supernatant collection device and its operating method. The supernatant collection device includes: a clear water collection tank for collecting supernatant from a sewage tank; an inlet structure disposed on the inlet side of the clear water collection tank, the inlet structure including a weir structure to allow surface water from the sewage tank to enter the clear water collection tank via the weir structure; an outlet channel disposed at the bottom of the clear water collection tank; an electrically operated valve disposed on the outlet channel for controlling the opening or closing of the outlet channel; a detection sensor for detecting water quality parameters of the water in the sewage tank; and a control unit, electrically connected to the detection sensor and the electrically operated valve, for controlling the opening or closing of the electrically operated valve based on the water quality parameters detected by the detection sensor. This disclosure can automatically adjust the water intake depth according to the turbidity of the water, thereby maximizing the collection speed of the supernatant while meeting turbidity requirements and improving system efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of water resource recycling, and in particular to a supernatant collection device and its operation method. Background Technology

[0002] During the operation of sedimentation tanks, sludge tanks, or thickening tanks in wastewater treatment plants, a relatively clean supernatant usually forms at the top of the tank. To improve system operating efficiency, this supernatant is often collected in a timely manner and returned to subsequent treatment units or the effluent system for reuse.

[0003] The existing methods for collecting supernatant mainly include:

[0004] 1. Fixed weir collection: The surface supernatant is intercepted by an overflow weir of fixed height. However, it has poor water level adaptability and serious sludge entrainment.

[0005] 2. Siphon collection, which uses the siphon effect to extract surface liquid, has problems with energy consumption and stability. It requires continuous energy consumption to maintain a vacuum, and the sludge is severely disturbed.

[0006] 3. Pump suction collection: The supernatant is directly extracted by a submersible pump. It has poor selectivity and there is no stratification filtration at the pump inlet.

[0007] 4. Floating tanks collect siphon drainage. Existing floating tanks are complex to manufacture, have poor adjustability, and low siphon efficiency. However, their effect is not ideal, requires a lot of manual intervention, and cannot avoid material leakage and environmental pollution.

[0008] Public content

[0009] I. Technical problems to be solved

[0010] This disclosure aims to at least partially solve one of the aforementioned technical problems.

[0011] II. Technical Solution

[0012] The first aspect of this disclosure provides a supernatant collection device. The supernatant collection device includes:

[0013] Clear water collection tank, used to collect the supernatant from sewage tanks;

[0014] The water inlet structure is located on the water inlet side of the clear water collection tank. The water inlet structure includes a weir structure so that the surface water of the sewage tank can enter the clear water collection tank through the weir structure.

[0015] The water outlet channel is located at the bottom of the clean water collection tank;

[0016] An electric on / off valve is installed on the water outlet channel to control the opening or closing of the water outlet channel;

[0017] The detection sensor is used to detect the water quality parameters of the water in the sewage tank. The sampling area of ​​the detection sensor is located in one of the following two positions: at the same horizontal reference plane as the bottom surface of the weir structure; or, below the horizontal reference plane where the bottom surface of the weir structure is located and above the horizontal reference plane where the bottom of the clear water collection tank is located.

[0018] The control unit is connected to the detection sensor and the electric switch valve by an electrical signal. It is used to control the electric switch valve to open or close according to the water quality parameters detected by the detection sensor, so that the supernatant that meets the preset water quality conditions can be discharged through the outlet channel.

[0019] In some embodiments of this disclosure, the detection sensor includes one or more of the following types: optical turbidity sensor, infrared scattering turbidity sensor, laser scattering suspended matter concentration sensor, or ultrasonic suspended matter concentration sensor.

[0020] In some embodiments of this disclosure, the electric switching valve is an electric valve that can be controlled to open or close, including one of the following types: electric lift plug valve, electric ball valve, electric butterfly valve, electric gate valve, or solenoid valve.

[0021] In some embodiments of this disclosure, the detection sensor is an optical turbidity sensor, and the measurement sampling area corresponding to the optical turbidity sensor is on the same horizontal reference plane as the bottom surface of the weir structure.

[0022] In some embodiments of this disclosure, the electric switching valve is an electric lifting plug valve, and the water outlet channel is a drain hole located at the bottom of the clean water collection tank. The electric lifting plug valve includes: a switching valve, a valve stem, a valve plug, and a valve seat. The switching valve is fixed above the clean water collection tank by a horizontal mounting bracket and is electrically connected to the control unit for driving the valve stem to move vertically. The upper end of the valve stem is connected to the switching valve, and the lower end is connected to the valve plug. The valve seat is located at the drain hole at the bottom of the clean water collection tank. The valve plug is located above the valve seat and cooperates with the valve seat. When the switching valve drives the valve stem to move downward, the valve plug presses against the valve seat to close the drain hole. When the switching valve drives the valve stem to move upward, the valve plug leaves the valve seat to open the drain hole.

[0023] In some embodiments of this disclosure, a buoyancy assembly is further included, connected to a clean water collection tank, for adjusting the height position of the water inlet structure; the buoyancy assembly includes a fixed float and an adjustable float, wherein the fixed float provides basic buoyancy; the buoyancy of the adjustable float is controllable; and a control unit controls the buoyancy of the adjustable float based on the turbidity value detected by the detection sensor, thereby adjusting the height position of the clean water collection tank in the sewage tank.

[0024] In some embodiments of this disclosure, the fixed float includes one or more of the following types: sealed buoy float, buoy box float, buoy barrel float, or foam-filled float.

[0025] In some embodiments of this disclosure, the adjustable float includes one of the following types: airbag float, liquid bladder float, or telescopic cavity float.

[0026] In some embodiments of this disclosure, the adjustable float includes: N telescopic cavity floats evenly arranged below the clear water collection tank, where N≥2; the telescopic cavity float includes: an outer cylinder, an inner telescopic cylinder, a sealing telescopic structure, and a telescopic drive mechanism; the outer cylinder is arranged vertically; the inner telescopic cylinder can telescopically move along the axial direction of the outer cylinder to change the internal volume of the telescopic cavity float; the sealing telescopic structure is arranged between the outer cylinder and the inner telescopic cylinder to maintain the sealing of the interior of the telescopic cavity float during telescopic movement; the telescopic drive mechanism is electrically connected to the control unit and is used to drive the inner telescopic cylinder to telescopically move along the axial direction of the outer cylinder; the telescopic drive mechanism includes one of the following types: an electric push rod drive mechanism, a screw and nut drive mechanism, or a hydraulic drive mechanism.

[0027] In some embodiments of this disclosure, the clear water collection tank is an overall ring structure with the ends connected; the weir structure is disposed on the inner wall plate and / or outer wall plate of the clear water collection tank, and the weir orifice shape of the weir structure includes one or more of the following types: rectangular weir, triangular weir, trapezoidal weir or sawtooth weir.

[0028] In some embodiments of this disclosure, the outlet channel of the clear water collection tank extends downward to the water collection pipe via an outlet hose. The water collection pipe is connected to the drainage system. The supernatant discharged from the clear water collection tank flows downward through the outlet hose and is collected into the main outlet pipe via the water collection pipe.

[0029] In some embodiments of this disclosure, the clean water collection tank is connected to the bottom wall, side wall, or support structure of the sewage tank via a guide structure, so that the clean water collection tank can be raised and lowered in the vertical direction. The guide structure includes one of the following types: a guide rail sliding structure, a guide rod structure, or a pulley guide structure.

[0030] A second aspect of this disclosure provides a method for operating a supernatant collection device. The supernatant collection device is as described above, and the operating method includes:

[0031] Step S1: Obtain the turbidity value of the water in the inlet area;

[0032] Step S2: Compare the detected turbidity value with the preset turbidity target value. If the turbidity value is lower than the turbidity target value, proceed to step S3; if the turbidity value is higher than the turbidity target value, proceed to step S4.

[0033] Step S3: Control the electric switch valve to open, so that the supernatant in the clear water collection tank is discharged through the water outlet channel;

[0034] Step S4: Control the electric switch valve to close to stop the discharge of supernatant from the clean water collection tank.

[0035] In some embodiments of this disclosure, the supernatant collection device further includes: a buoyancy component for adjusting the height of the water intake structure; the buoyancy component includes a fixed float and an adjustable float, wherein the fixed float provides basic buoyancy; the buoyancy of the adjustable float is controllable; after step S3, the device further includes: step S31, comparing the detected turbidity value with the risk turbidity value; when the turbidity value is lower than the risk turbidity value, step S32 is executed; when the turbidity value is higher than the risk turbidity value, step S33 is executed; in step S32, controlling the adjustable float to change its volume to reduce buoyancy, thereby lowering the water intake height; in step S33, controlling the adjustable float to gradually change its volume to increase buoyancy, thereby raising the water intake height; wherein the risk turbidity value Trisk is set between 0.5 and 0.9 times the target turbidity value Ttarget, preferably 0.75 times.

[0036] III. Beneficial Effects

[0037] As can be seen from the above technical solution, this disclosure has at least one of the following beneficial effects compared to the prior art:

[0038] (1) In this disclosure, supernatant that meets the target turbidity value can be obtained by using a detection sensor and an electric switching valve. Furthermore, by setting a control method that controls the adjustable float to change the buoyancy based on the water quality detection results to adjust the height of the clear water collection tank, the device can automatically adjust the water intake depth according to the turbidity of the water, thereby increasing the collection speed of the supernatant as much as possible while meeting the turbidity requirements and improving the system efficiency.

[0039] (2) In this disclosure, by setting an optical turbidity sensor at a specific location, the detection sensor can detect the water body at a location close to the actual water intake area, so that the detected turbidity information can better reflect the water quality status of the actual water intake layer of the weir structure, improve the consistency between the water quality detection results and the actual water intake water quality, and thus help improve the accuracy of the control unit in controlling the water intake process.

[0040] (3) Existing sludge discharge tank supernatant collection devices mostly adopt local water intake or single-sided weir water intake structures. The water intake range is usually limited to one side or a local area of ​​the tank. When the water in the tank is disturbed or there is uneven flow field, it is easy to cause large differences in water quality at different locations, thus affecting the stability of water intake. This disclosure sets the clear water collection tank as a ring structure with the ends connected and sets weir structures on the inner and outer walls of the clear water collection tank. This allows the device to form a continuous water intake area around the sludge discharge tank, thereby expanding the water intake coverage range and allowing the supernatant from all directions to enter the clear water collection tank for collection. At the same time, the ring structure helps to make the device more uniformly stressed in the tank, improve the overall structural stability, and make the supernatant collection process more uniform and continuous, thus improving the efficiency and stability of supernatant collection in the sludge discharge tank.

[0041] (4) In this disclosure, by limiting the outlet hose to a downward flow arrangement, the discharged water can flow out naturally under gravity, thereby reducing the resistance generated during drainage, greatly simplifying the water outlet method, saving energy, and avoiding air blockage in the pipe. This is beneficial to improving the stability of the drainage process and reducing the complexity of construction. At the same time, it avoids the restriction of the device's floating movement by rigid pipes, improving the reliability and flexibility of the device during operation.

[0042] (5) In this disclosure, the up-and-down movement of the clear water collection tank is guided by a guide structure, so that the clear water collection tank can move stably in a predetermined direction during the change of buoyancy, thereby avoiding tilting or swaying of the device, thereby improving the stability and structural reliability of the device during the movement process.

[0043] (6) In this disclosure, the adjustable float can drive the inner telescopic cylinder to telescopically move through the telescopic drive mechanism, thereby changing the internal volume of the float and realizing continuous adjustment of buoyancy. This is beneficial to improving the accuracy and stability of water intake height adjustment, and to adapting to the water quality changes of different depths in the sludge discharge tank, thus providing more convenience for the flexibility of supernatant collection. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the sludge supernatant collection device in an embodiment of this disclosure.

[0045] Figure 2 for Figure 1 Enlarged view of the optical turbidity sensor and electric switching valve in the supernatant collection device of the sludge discharge tank shown.

[0046] Figure 3 This is a flowchart illustrating the operation method of the sludge supernatant collection device according to an embodiment of this disclosure. Detailed Implementation

[0047] The core objective of this disclosure is to systematically solve the key technical problems existing in traditional sludge discharge tank supernatant collection technology, such as complex construction, low efficiency, high energy consumption, and frequent maintenance, through the synergistic design of structural innovation, intelligent control, and energy efficiency optimization.

[0048] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0049] In one exemplary embodiment of this disclosure, a device for collecting supernatant from a sludge discharge tank is provided. This embodiment uses a sludge discharge tank from a wastewater treatment plant as an example. However, those skilled in the art should understand that sedimentation tanks, thickening tanks, etc., in wastewater treatment plants can also employ the technical solutions of this disclosure and are also within the scope of protection of this disclosure.

[0050] Figure 1 This is a schematic diagram of the structure of the sludge supernatant collection device in an embodiment of this disclosure. Figure 2 for Figure 1 The diagram shows an enlarged view of the optical turbidity sensor and the electric switching valve in the sludge supernatant collection device. As shown, the sludge supernatant collection device in this embodiment mainly consists of the following parts: a clear water collection tank 1, a float 2, a switching motor 3, a detection sensor 4, a guide seat 5, a guide rod 6, an outlet hose 7, a water collection pipe 8, a main outlet pipe 9, and a valve plug 10. Specifically, the specific structure of each component in the sludge supernatant collection device of this embodiment is as follows:

[0051] Clear water collection tank 1 is used to collect the supernatant from the sewage tank;

[0052] The water inlet structure is located on the water inlet side of the clear water collection tank. The water inlet structure includes a weir structure so that the surface water of the sewage tank can enter the clear water collection tank through the weir structure.

[0053] The water outlet channel is located at the bottom of the clean water collection tank;

[0054] An electric on / off valve is installed on the water outlet channel to control the opening or closing of the water outlet channel;

[0055] The detection sensor 4 is used to detect the water quality parameters of the water body. The measurement sampling area corresponding to the detection sensor is located in one of the following two positions: it is on the same horizontal reference plane as the bottom surface of the weir structure; or it is located below the horizontal reference plane where the bottom surface of the weir structure is located and above the horizontal reference plane where the bottom of the clear water collection tank is located.

[0056] The control unit is electrically connected to the detection sensor and the electric switching valve. It is used to control the electric switching valve to open or close according to the water quality parameters detected by the detection sensor, so that the supernatant that meets the preset water quality conditions can be discharged through the outlet channel.

[0057] The following sections will describe in detail each part of the sludge supernatant collection device in this embodiment.

[0058] As shown in the figure, the clear water collection tank 1 has a rectangular ring structure with its ends connected, specifically including four clear water collection tanks. The weir structure is set on the inner and outer wall panels of the clear water collection tank.

[0059] Existing sludge discharge tank supernatant collection devices mostly employ localized water intake or single-sided weir intake structures. The water intake range is typically limited to one side or a localized area of ​​the tank. When the water in the tank is disturbed or there is uneven flow field, it can easily lead to significant differences in water quality at different locations, thus affecting the stability of water intake. This disclosure addresses this issue by designing the entire clear water collection tank as a continuous annular structure with weir structures on the inner and outer walls of the clear water collection tank. This allows the device to form a continuous water intake area around the sludge discharge tank, thereby expanding the water intake coverage and ensuring that supernatant from all directions can enter the clear water collection tank for collection. Simultaneously, the annular structure helps to distribute the force more evenly within the tank, improving overall structural stability and making the supernatant collection process more uniform and continuous, thus improving the efficiency and stability of supernatant collection in the sludge discharge tank.

[0060] In this embodiment, the weir structure uses a triangular weir. Using a triangular weir for water intake ensures sufficient water output, improves production efficiency, and prevents impurities from accumulating on the pool surface. More importantly, the triangular weir is characterized by a narrow lower section and a wide upper section, resulting in different inlet cross-sections. In this configuration, the control unit, in conjunction with an adjustable float, can more conveniently and effectively control the water output speed.

[0061] Those skilled in the art should understand that in this embodiment, the triangular weir is directly installed on the front and rear wall panels on both sides of the clear water collection tank. However, in other embodiments of this disclosure, the triangular weir may also be installed only on the inner wall panel of the clear water collection tank. Besides the triangular weir, this disclosure may also employ trapezoidal weirs or sawtooth weirs, etc. Furthermore, the weir structure may not be directly installed on the wall panel of the clear water collection tank, but may be indirectly connected to the clear water collection tank via connecting pipes. These variations can also achieve this disclosure and are also within the scope of protection of this disclosure.

[0062] As shown in the figure, each clean water collection tank has a water outlet at the bottom center. Water flows from the water outlet to the water outlet hose 7, which extends downwards to connect to the fixed water collection pipe 8 below, and finally flows from the main water outlet pipe 9 to the clean water collection tank. The water outlet hose 7 can be one or more of the following types: rubber hose, corrugated hose, or reinforced composite hose.

[0063] In this embodiment, by arranging the outlet hose in a downward flow manner, the discharged water can flow out naturally under gravity, thereby reducing resistance during drainage, greatly simplifying the drainage method, saving energy, and preventing airlocks in the pipes. This improves the stability of the drainage process and reduces construction complexity. Furthermore, it avoids the restriction of the device's floating movement by rigid pipes, improving the reliability and flexibility of the device during operation.

[0064] In this embodiment, the clean water collection tank is connected to the bottom wall, side wall, or support structure of the sewage tank via a guide structure, enabling the clean water collection tank to move vertically up and down. This guide structure is a guide rod structure, comprising a guide rod 6 and a guide seat 5. Stops are set at appropriate positions on the guide rods. The upper and lower ends of the guide rod 6 are fixed to the four corners of the tank according to the design positions. The guide seat 5 is vertically positioned and fixed to the sewage tank wall or support structure, with one end connected to the clean water collection tank 1 and the other end threaded through the guide rod 6. The entire clean water collection tank, consisting of four clean water collection tanks 1, can move vertically up and down on the four guide rods 6.

[0065] In this embodiment, a guide structure is set to guide the up-and-down movement of the clean water collection tank, so that the clean water collection tank can move stably in a predetermined direction during the process of buoyancy change, thereby avoiding tilting or swaying of the device and improving the stability and structural reliability of the device during movement.

[0066] Those skilled in the art should understand that, in addition to the guide rod structure, a guide rail sliding structure, a pulley guide structure, etc., can also be used to enable the water collection tank to rise and fall in the vertical direction, which can also achieve the purpose of this disclosure and is also within the protection scope of this disclosure.

[0067] As shown in the figure, each clear water collection tank 1 is equipped with an electric switch valve in the middle, which is controlled by a control unit. The control unit controls the electric switch valve to open or close according to the water quality parameters detected by the detection sensor, so that the supernatant that meets the preset water quality conditions is discharged through the outlet channel.

[0068] Specifically, in this disclosure, the detection sensor 4 is an optical turbidity sensor, and the measurement sampling area corresponding to the optical turbidity sensor is on the same horizontal reference plane as the bottom surface of the weir structure; or, it is located below the horizontal reference plane where the bottom surface of the weir structure is located and above the horizontal reference plane where the bottom of the clear water collection tank is located.

[0069] It should be noted that in this embodiment, the detection sensor is an optical turbidity sensor, but this disclosure is not limited thereto. In other embodiments of this disclosure, the detection sensor may also be an infrared scattering turbidity sensor, a laser scattering suspended matter concentration sensor, or an ultrasonic suspended matter concentration sensor, etc., which can also achieve the purpose of this disclosure and are also within the protection scope of this disclosure.

[0070] In this embodiment, by setting an optical turbidity sensor at a specific location, the detection sensor can detect the water body at a location close to the actual water intake area. This allows the detected turbidity information to better reflect the water quality status of the actual water intake layer of the weir structure, improving the consistency between the water quality detection results and the actual water intake quality. This, in turn, helps to improve the accuracy of the control unit in controlling the water intake process.

[0071] Specifically, in this embodiment, the electric switching valve includes: a switching motor 3, a valve stem, a valve plug 10, and a valve seat. The switching motor 3 is fixed above the clean water collection tank by a horizontal mounting bracket and is electrically connected to the control unit to drive the valve stem to move vertically. The upper end of the valve stem is connected to the switching motor 3, and the lower end is connected to the valve plug 10. The valve seat is located at the drain hole at the bottom of the clean water collection tank. The valve plug 10 is located above the valve seat and cooperates with the valve seat. When the switching motor 3 drives the valve stem to move downward, the valve plug 10 presses against the valve seat to close the drain hole. When the switching motor 3 drives the valve stem to move upward, the valve plug 10 leaves the valve seat to open the drain hole.

[0072] During operation, the detection sensor 4 can detect the water quality on both sides of the clear water collection tank 1. When the turbidity is low enough to meet the collection standard, the electric switch valve will open. When the turbidity exceeds the collection standard, the valve will close.

[0073] In this embodiment, the valve structure is driven by an electric actuator to control its opening and closing, thereby forming a stable and reliable "detection-control-execution" work chain, which is beneficial to improving the response speed and control accuracy of the water intake control system.

[0074] It should be noted that the electrically operated valve in this embodiment is merely an example. In other embodiments of this disclosure, electrically operated ball valves, electrically operated butterfly valves, electrically operated gate valves, or solenoid valves can also be used to achieve the same purpose and are also within the scope of protection of this disclosure.

[0075] In this embodiment, the supernatant collection device further includes a buoyancy component for adjusting the height of the water inlet structure. The buoyancy component is evenly distributed along the circumference of the clear water collection tank. This arrangement ensures that the clear water collection tank receives uniform support during buoyancy adjustment, thereby reducing structural tilting or swaying caused by uneven force.

[0076] Furthermore, the buoyancy assembly includes a fixed float 2 and an adjustable float. The fixed float provides basic buoyancy, while the volume of the adjustable float changes according to the control signal from the control unit, thereby altering the buoyancy of the buoyancy assembly and adjusting the height of the clear water collection tank relative to the surface of the wastewater tank. Specifically, two fixed floats 2 with a density less than water are installed below each clear water collection tank 1. The adjustable float below the fixed floats allows for convenient control of the influent flow rate.

[0077] In this embodiment, the fixed float is a foam-filled float, but this disclosure is not limited thereto. In other embodiments of this disclosure, the fixed float may also include one or more of the following types: sealed pontoon float, pontoon box float, pontoon barrel float, etc., which can also achieve this disclosure and are also within the protection scope of this disclosure.

[0078] In this embodiment, the adjustable float is a telescopic cavity type float. The telescopic cavity type float includes: an outer cylinder, an inner telescopic cylinder, a sealing telescopic structure, and a telescopic drive mechanism. The inner telescopic cylinder can telescopically move along the axial direction of the outer cylinder to change the internal volume of the telescopic cavity type float; the sealing telescopic structure is disposed between the outer cylinder and the inner telescopic cylinder to maintain the internal sealing of the telescopic cavity type float during telescopic movement; the telescopic drive mechanism is electrically connected to the control unit and is used to drive the inner telescopic cylinder to telescopically move along the axial direction of the outer cylinder. The telescopic drive mechanism includes one of the following types: an electric push rod drive mechanism, a lead screw and nut drive mechanism, or a hydraulic drive mechanism.

[0079] Those skilled in the art should understand that the telescopic cavity type float is only a preferred embodiment, but this disclosure is not limited thereto. In other embodiments of this disclosure, the adjustable float can also be in the form of an airbag type float, a liquid bladder type float, etc., which can also achieve the present disclosure and are also within the protection scope of this disclosure.

[0080] In this embodiment, the adjustable float can be driven by the telescopic drive mechanism to extend and retract the inner telescopic cylinder, thereby changing the internal volume of the float and realizing continuous adjustment of buoyancy. This is beneficial to improving the accuracy and stability of water intake height adjustment, adapting to water quality changes at different depths in the sludge discharge tank, and providing more convenience for the flexibility of supernatant collection.

[0081] Based on the above-described supernatant collection device, this disclosure also provides an operating method for the supernatant collection device. This operating method is executed by the supernatant collection device, used to set a target turbidity value, and control ① the state of an electric switching valve and ② the height position of the clear water collection tank based on the turbidity value detected by the detection sensor.

[0082] Figure 3This is a flowchart illustrating the operation method of the sludge supernatant collection device according to an embodiment of this disclosure. As shown in the figure, the operation method of the sludge supernatant collection device in this embodiment includes:

[0083] Step S1: Obtain the turbidity value T of the water in the inlet area of ​​the weir structure from the detection sensor;

[0084] Step S2, compare the detected turbidity value T with the preset turbidity target value T target For comparison, when the turbidity value is lower than the target turbidity value T target When the turbidity value T is higher than the target turbidity value T, proceed to step S3; target When the time comes, proceed to step S4;

[0085] Step S3: Control the electric switch motor to turn on, so that the supernatant in the clear water collection tank is discharged through the water outlet channel;

[0086] Step S31: Compare the detected turbidity value with the risk turbidity value. If the turbidity value is lower than the risk turbidity value, proceed to step S32; if the turbidity value is higher than the risk turbidity value, proceed to step S33; wherein, the risk turbidity value T... risk At the target turbidity value T target The value is set between 0.5 and 0.9 times, preferably 0.75 times.

[0087] Step S32: Control the adjustable float to change its volume to reduce buoyancy, thereby lowering the water intake height and increasing the water intake speed; execute step S1.

[0088] Step S33: Control the adjustable float to gradually change its volume to increase buoyancy, thereby raising the water intake height and gradually reducing the water intake speed; execute step S1.

[0089] Step S4: Control the electric switch motor to turn off to stop the discharge of supernatant from the clean water collection tank;

[0090] In this embodiment, a supernatant meeting the target turbidity value can be obtained through a detection sensor and an electrically operated switching valve. Furthermore, by setting a control method that adjusts the buoyancy of an adjustable float to adjust the height of the clear water collection tank based on water quality detection results, the device can automatically adjust the water intake depth according to the water turbidity, thereby maximizing the collection speed of the supernatant while meeting the turbidity requirements and improving system efficiency.

[0091] In summary, this disclosure systematically solves the key technical problems of traditional sludge discharge tank supernatant collection technology, such as complex construction, low efficiency, high energy consumption, and frequent maintenance, through structural innovation, intelligent control, and system optimization.

[0092] Specific application scenario: In the renovation of a water plant's sludge system, the existing floating tank siphon-type supernatant collection system is inefficient. The on-site use of a suspended submersible pump to directly draw supernatant results in high energy consumption, high turbidity of the collected supernatant, and a large accumulation of floating impurities on the surface. The proposed renovation solution is the one described above. Simulation results show that this solution can improve production efficiency and ensure efficient system operation.

[0093] This concludes the description of the embodiments of this disclosure. Based on the above description, those skilled in the art should have a clear understanding of this disclosure.

[0094] It should be noted that for some implementation methods, if they are not key contents of this disclosure and are well known to those skilled in the art, they are not described in detail in the accompanying drawings or text due to space limitations. In such cases, relevant prior art can be referred to for understanding.

[0095] The directional terms used in this disclosure, such as "center," "lateral," "longitudinal," "top," "bottom," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," indicate orientations or positional relationships based solely on the orientations or positional relationships shown in the accompanying drawings. These terms are used only for the convenience of describing this disclosure and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, throughout the accompanying drawings, the same elements are represented by the same or similar reference numerals. Also, the shapes and dimensions of the components in the drawings do not reflect actual size and proportion, but are only schematic representations of embodiments of this disclosure.

[0096] The terms "connected" and "linked" used in this disclosure should be interpreted broadly, unless otherwise expressly specified and limited. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection of a portion of two components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0097] Those skilled in the art will understand that the modules or steps of this disclosure described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computing device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, this disclosure is not limited to any particular combination of hardware and software.

[0098] This disclosure can also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for performing part or all of the methods described herein. Such an implementation of the disclosure may be stored on a computer-readable medium or may take the form of one or more signals. Such signals may be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0099] This disclosure can be implemented using hardware comprising several different elements and a suitably programmed computer. Various component embodiments of this disclosure can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Physical implementations of the hardware structure include, but are not limited to, physical devices, including, but not limited to, transistors, memristors, DNA computers, microcontrollers, microprocessors, or digital signal processors (DSPs). Furthermore, this disclosure is not directed to any particular programming language. It should be understood that the contents of this disclosure can be implemented using various programming languages, and the description of specific languages ​​herein is for the purpose of disclosing the best mode of implementation of this disclosure.

[0100] Those skilled in the art will understand that in the claims and specification of this disclosure, the word "comprising" does not exclude the presence of elements (or steps) not listed in the claims. The word "a" or "an" preceding an element (or step) does not exclude the presence of a plurality of such elements (or steps).

[0101] Furthermore, the above embodiments are provided only to enable this disclosure to meet legal requirements, and this disclosure may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0102] Similarly, it should be understood that, for the sake of brevity, in the foregoing description of exemplary embodiments of this disclosure, various features of this disclosure are sometimes grouped together in a single embodiment, figure, or description thereof. However, this approach to disclosure should not be construed as reflecting an intention that the claimed disclosure requires more features than are expressly recited in each claim. Rather, as reflected in the claims, each aspect of the disclosure comprises fewer than all the features of the preceding single embodiment. Furthermore, embodiments may be used in combination with each other or with other embodiments based on design and reliability considerations; that is, technical features from different embodiments can be freely combined to form more embodiments. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this disclosure.

[0103] The above specific embodiments have provided a detailed description of the purpose, technical means, and beneficial effects of this disclosure. It should be understood that the purpose of the detailed description is to enable those skilled in the art to understand this disclosure more clearly, and it is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A supernatant collection device, characterized in that, include: Clear water collection tank, used to collect the supernatant from sewage tanks; A water inlet structure is provided on the water inlet side of the clear water collection tank. The water inlet structure includes a weir structure so that the surface water of the sewage tank enters the clear water collection tank through the weir structure. A water outlet channel is located at the bottom of the clean water collection tank; An electric switch valve is installed on the water outlet channel to control the opening or closing of the water outlet channel; A detection sensor is used to detect water quality parameters in the sewage tank. The sampling area of ​​the detection sensor is located in one of the following two positions: at the same horizontal reference plane as the bottom surface of the weir structure; or below the horizontal reference plane where the bottom surface of the weir structure is located and above the horizontal reference plane where the bottom of the clear water collection tank is located. The control unit is electrically connected to the detection sensor and the electric switch valve. It is used to control the electric switch valve to open or close according to the water quality parameters detected by the detection sensor, so that the supernatant that meets the preset water quality conditions is discharged through the outlet channel.

2. The supernatant collection device according to claim 1, characterized in that, The detection sensor includes one or more of the following types: optical turbidity sensor, infrared scattering turbidity sensor, laser scattering suspended matter concentration sensor, or ultrasonic suspended matter concentration sensor; and / or, The electric switching valve is an electric valve that can be controlled to open or close, including one of the following types: electric lift valve, electric ball valve, electric butterfly valve, electric gate valve, or solenoid valve.

3. The supernatant collection device according to claim 1 or 2, characterized in that, The detection sensor is an optical turbidity sensor, and the measurement sampling area corresponding to the optical turbidity sensor is on the same horizontal reference plane as the bottom surface of the weir structure; and / or, The electric switch valve is an electric lifting plug valve, and the water outlet channel is a drain hole located at the bottom of the clean water collection tank. The electric lifting plug valve includes a switch valve, a valve stem, a valve plug, and a valve seat. The switch valve is fixed above the clean water collection tank by a horizontal mounting bracket and is electrically connected to the control unit, used to drive the valve stem to move vertically. The upper end of the valve stem is connected to the switch valve, and the lower end is connected to the valve plug. The valve seat is located at the drain hole at the bottom of the clean water collection tank. The valve plug is located above the valve seat and cooperates with the valve seat. When the switch valve drives the valve stem to move downwards, the valve plug presses against the valve seat to close the drain hole; when the switch valve drives the valve stem to move upwards, the valve plug moves away from the valve seat to open the drain hole.

4. The supernatant collection device according to any one of claims 1 to 3, characterized in that, It also includes: a buoyancy component, connected to a clean water collection tank, used to adjust the height of the water inlet structure; The buoyancy assembly includes a fixed float and an adjustable float, wherein the fixed float provides basic buoyancy, and the buoyancy of the adjustable float is controllable; The control unit is used to control the buoyancy of the adjustable float according to the turbidity value detected by the detection sensor, thereby adjusting the height of the clean water collection tank in the sewage tank.

5. The supernatant collection device according to claim 4, characterized in that, The fixed floating body includes one or more of the following types: sealed pontoon type floating body, pontoon type floating body, float barrel type floating body, or foam-filled floating body; and / or, The adjustable float includes one of the following types: airbag float, liquid bladder float, or telescopic cavity float.

6. The supernatant collection device according to claim 5, characterized in that, The adjustable float includes: N telescopic cavity floats evenly arranged below the clear water collection tank, where N≥2; The telescopic cavity type float includes: an outer cylinder, an inner telescopic cylinder, a sealed telescopic structure, and a telescopic drive mechanism. The outer cylinder is arranged in a vertical direction; The inner telescopic cylinder can extend and retract along the axial direction of the outer cylinder to change the internal volume of the telescopic cavity float. The sealing telescopic structure is disposed between the outer cylinder and the inner telescopic cylinder to maintain the sealing of the interior of the telescopic cavity float during the telescopic process; The telescopic drive mechanism is electrically connected to the control unit and is used to drive the inner telescopic cylinder to move telescopically along the axial direction of the outer cylinder. The telescopic drive mechanism includes one of the following types: electric push rod drive mechanism, lead screw and nut drive mechanism, or hydraulic drive mechanism.

7. The supernatant collection device according to claim 1, characterized in that, The water collection tank has a ring structure with the ends connected. The weir structure is disposed on the inner wall plate and / or outer wall plate of the clear water collection tank, and the weir orifice shape of the weir structure includes one or more of the following types: rectangular weir, triangular weir, trapezoidal weir or sawtooth weir.

8. The supernatant collection device according to claim 7, characterized in that, The water outlet channel of the clear water collection tank extends downwards through a flexible outlet hose and connects to a water collection pipe. The water collection pipe is connected to a drainage system. The supernatant discharged from the clear water collection tank flows downwards through the flexible outlet hose and is collected in the main water outlet pipe via the water collection pipe; and / or, The clean water collection tank is connected to the bottom wall, side wall or support structure of the sewage tank through a guide structure so that the clean water collection tank can be raised and lowered in the vertical direction. The guide structure includes one of the following types: guide rail sliding structure, guide rod structure or pulley guide structure.

9. A method for operating a supernatant collection device, characterized in that, The supernatant collection device is the supernatant collection device according to claim 3, and the operating method includes: Step S1: Obtain the turbidity value of the water in the inlet area; Step S2: Compare the detected turbidity value with the preset turbidity target value. If the turbidity value is lower than the turbidity target value, proceed to step S3; if the turbidity value is higher than the turbidity target value, proceed to step S4. Step S3: Control the electric switch valve to open, so that the supernatant in the clear water collection tank is discharged through the water outlet channel; Step S4: Control the electric switch valve to close to stop the discharge of supernatant from the clean water collection tank.

10. The method of operating the supernatant collection device according to claim 9, characterized in that, The supernatant collection device further includes: a buoyancy component for adjusting the height of the water inlet structure; the buoyancy component includes a fixed float and an adjustable float, wherein the fixed float provides basic buoyancy; and the buoyancy of the adjustable float is controllable. The step S3 is followed by: Step S31: Compare the detected turbidity value with the risk turbidity value. If the turbidity value is lower than the risk turbidity value, proceed to step S32; if the turbidity value is higher than the risk turbidity value, proceed to step S33. Step S32: Control the adjustable float to change its volume to reduce buoyancy and lower the water intake height; Step S33: Control the adjustable float to gradually change its volume to increase buoyancy and raise the water intake height; Wherein, the risk turbidity value T risk At the target turbidity value T target The value is set between 0.5 and 0.9 times, preferably 0.75 times.

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