Mud level detection device

Abstract

This application provides a sludge level detection device, which includes a sampling tube and a sludge concentration sensor. The sampling tube includes a main sampling tube and multiple sampling branch tubes connected to the main sampling tube. The multiple sampling branch tubes are inserted into the sludge tank to be tested, and the lengths of the multiple sampling branch tubes are different, used to sample the sludge and water at different depths in the sludge tank. The sludge concentration sensor is connected to the sampling tube and is used to detect the sludge concentration of the sludge and water flowing through the sampling tube. This sludge level detection device has the characteristics of simple structure and high measurement efficiency. It can not only measure the sludge level with high precision, but also automatically execute process control commands based on the measurement results, realizing the intelligent and automated operation of the sedimentation tank. It can objectively reflect the sludge settling characteristics and sludge-water separation state, quickly determine the sludge layer thickness, and provide key data support for the dynamic control of wastewater treatment processes.

Description

Technical Field

[0001] This invention relates to the technical field of sludge treatment equipment, specifically to a sludge level detection device. Background Technology

[0002] Currently, the commonly used methods for mud level measurement in the industry are mainly as follows, but they all have certain limitations and cannot achieve precise closed-loop control: 1. Manual visual inspection method: This method is simple and low-cost, but it relies entirely on personal experience, is highly subjective, has poor accuracy, cannot achieve continuous online monitoring and automatic control, and has safety hazards. It can no longer meet the needs of modern water plant automation.

[0003] 2. Optical interface instrument: Its optical probe is easily contaminated by pollutants, which leads to the attenuation and failure of the measurement signal. It requires frequent manual cleaning and maintenance, has poor reliability, and is difficult to use as a stable and reliable signal source for the control system.

[0004] 3. Ultrasonic interface meter: This method is easily affected by scum, foam, water temperature changes, and bubbles and turbulence in the pool. The measurement signal fluctuates, and the stability and accuracy of automatic control based on its single detection value are insufficient.

[0005] 4. Immersive pressure sensor method: The sensor is easily blocked and corroded, requires multiple installations, the system is complex, and the initial investment and maintenance costs are high, making it difficult to promote and apply on a large scale and build an economical and reliable closed-loop control system.

[0006] In summary, existing technologies either cannot achieve online automatic monitoring and control, or suffer from problems such as susceptibility to pollution, environmental interference, unstable measurement signals, inability to support closed-loop control, and high maintenance workload or cost. Utility Model Content

[0007] This application provides a sludge level detection device, which includes a sampling tube and a sludge concentration sensor. The sampling tube includes a main sampling tube and multiple sampling branch tubes connected to the main sampling tube. The multiple sampling branch tubes are inserted into the sludge tank to be tested, and the lengths of the multiple sampling branch tubes are different, so as to sample the sludge and water at different depths in the sludge tank to be tested. The sludge concentration sensor is connected to the sampling tube and is used to detect the sludge concentration of the sludge and water flowing through the sampling tube.

[0008] In some optional embodiments, the mud level detection device further includes a suction device connected to the sampling header for providing driving force for suctioning mud and water.

[0009] In some alternative embodiments, the suction device is a sludge pump.

[0010] In some optional embodiments, the sludge concentration sensor is located on the sampling header and is used to detect the sludge concentration of the sludge water flowing through the sampling header.

[0011] In some alternative embodiments, the mud level detection device further includes a valve located on the sampling branch pipe.

[0012] In some alternative embodiments, each of the sampling branches is provided with one of the valves.

[0013] In some alternative embodiments, the valve is a pneumatic valve.

[0014] In some optional embodiments, the sludge level detection device further includes an observation tank connected to the discharge pipe of the sludge pump, for holding sludge and water and for operator observation.

[0015] In some optional embodiments, the mud level detection device further includes a return pipe connected to the bottom of the observation tank for draining mud and water from the observation tank.

[0016] In some optional embodiments, the sludge level detection device further includes a control unit connected to the sludge concentration sensor and the sludge pump, for receiving detection signals from the sludge concentration sensor and controlling the operating status of the sludge pump.

[0017] The sludge level detection device provided in this application embodiment has the characteristics of simple structure and high measurement efficiency. This detection device can not only measure the sludge level with high precision, but also automatically execute process control commands based on the measurement results, realizing the intelligent and automated operation of the sedimentation tank. By measuring the sludge level height and its changing trend in the sedimentation tank at regular intervals and with precision, this detection device objectively reflects the sludge settling characteristics and sludge-water separation state, quickly determines the sludge layer thickness, and provides key data support for the dynamic control of the wastewater treatment process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a radial flow sedimentation tank. Figure 2 This is a schematic diagram of the structure of an embodiment of the mud level detection device of this application; Figure 3 yes Figure 2A top view of a partial structure of the mud level detection device in the embodiment; Figure 4 This is a schematic diagram of the structure of the sludge level detection device and the sludge tank in this application. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The terms "first," "second," and "third" used in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movement of components in a specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. The terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] The sludge level detection device in this embodiment is mainly used for sludge level detection in radial flow sedimentation tanks. First, the design and workflow of the radial flow sedimentation tank are analyzed. Please refer to... Figure 1 , Figure 1This is a schematic diagram of a radial flow sedimentation tank. The structure consists of the tank body, influent system, effluent system, and sludge collection and discharge system. The process is a continuous physical sedimentation process, following the principle of "central influent, peripheral effluent, and bottom sludge discharge."

[0024] The working process of this radial flow sedimentation tank is as follows: a. Water Inlet and Distribution: The wastewater to be treated flows into the central guide tube at the center of the pool through the inlet pipe. The water flow velocity decreases within the guide tube, and then it diffuses evenly radially from the bottom of the tube to the periphery of the pool. The water flow velocity gradually decreases from the center to the edges.

[0025] b. Sedimentation Process: As the water flows slowly outwards, its velocity becomes very low, almost to the point of stillness. Suspended solids (SS) with a density greater than water begin to settle naturally under the influence of gravity, gradually sinking to the bottom of the pool. This process is called "solid-liquid separation." The closer to the center of the pool, the faster the water flow; the closer to the perimeter, the slower the flow and the better the sedimentation effect.

[0026] c. Effluent Collection: After sufficient sedimentation, the clarified water at the top (called "supernatant") reaches the effluent weir at the tank wall. The clarified water flows evenly over the effluent weir into the collection tank, and finally flows out of the sedimentation tank through the effluent pipe to enter the next treatment unit or be discharged after meeting standards. The scum baffle prevents scum on the water surface from entering the effluent with the water flow.

[0027] d. Sludge Collection and Discharge: Throughout the sedimentation process, the sludge scraper rotates slowly. Sludge scrapers installed at the bottom of the scraper continuously and gently scrape the sludge settled at the bottom of the tank towards the sludge hopper in the center of the tank, avoiding re-stirring up the settled sludge. In the sludge hopper, the sludge is further concentrated (some water is squeezed out). The concentrated sludge is discharged from the tank periodically or continuously through the sludge discharge pipe and enters the next treatment unit; the sludge deposited at the bottom of the tank is discharged periodically or continuously through the sludge discharge pipe. By scientifically controlling the frequency and timing of sludge discharge, the sludge level in the tank can be maintained within a reasonable range, preventing the sludge layer from becoming too high and causing flocs to re-flood, resulting in sludge carried over into the effluent.

[0028] In traditional operation and management, the sludge level inside sedimentation tanks cannot be directly observed. Operators mostly rely on visual indicators such as effluent turbidity and liquid surface appearance, combined with empirical values ​​of sludge concentration, to make comprehensive judgments. This method is highly dependent on personal experience, lacks quantitative basis, and is difficult to achieve precise control. Especially in the pulp and paper industry, wastewater has high organic matter concentration and high suspended solids load, placing extremely high demands on the stable operation of wastewater treatment facilities. To maximize the function of the facilities, the actual operating load usually needs to reach about 90% of the design capacity, close to the system's treatment limit. Under this high-load condition, accurate monitoring of the sludge level has become a key auxiliary parameter for improving process stability and ensuring effluent compliance, and is of great significance for optimizing sludge discharge operations, providing early warning of sludge bulking, and preventing sludge loss.

[0029] In view of this, this application provides a mud level detection device, which can be referred to in conjunction with the embodiments. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of an embodiment of the mud level detection device of this application. Figure 3 yes Figure 2 A top view of a partial structure of the sludge level detection device in this embodiment is shown. The sludge level detection device 10 in this embodiment includes a sampling tube 100 and a sludge concentration sensor 200.

[0030] Specifically, the sampling tube 100 includes a sampling main tube 110 and multiple sampling branch tubes 120 connected to the sampling main tube 110. Each sampling branch tube 120 is connected to the sampling main tube 110 via a tee connector 102. The sampling main tube 110 and the multiple sampling branch tubes 120 can be made of stainless steel and are connected by welding.

[0031] Please see Figure 4 , Figure 4 This is a schematic diagram of the sludge level detection device of this application in conjunction with a sludge tank. Multiple sampling branch pipes 120 are inserted into the sludge tank 20 to be tested. The lengths of the multiple sampling branch pipes 120 are different, used to sample sludge and water at different depths in the sludge tank 20. A sludge concentration sensor 200 is connected to the sampling pipe 100 and is used to detect the sludge concentration of the sludge flowing through the sampling pipe 100. Optionally, in this embodiment, the sludge concentration sensor 200 is located on the sampling main pipe 110 and is used to detect the sludge concentration of the sludge flowing through the sampling main pipe 110.

[0032] Alternatively, please continue reading Figure 2The mud level detection device 10 in this embodiment also includes a valve 300 and a control unit 400. The valve 300 is installed on the sampling branch pipe 120. Each sampling branch pipe 120 is equipped with a valve 300. The valve 300 can be a pneumatic valve. By connecting to the control unit 400 by electrical signal, the opening and closing of the valves 300 on different sampling branch pipes 120 can be automatically controlled, thereby selecting different mud and water sampling depth positions.

[0033] Optionally, the sludge level detection device 10 in this embodiment further includes a suction device 500, which is connected to the sampling header 110 and is used to provide driving force for suctioning sludge and water. In this embodiment, the suction device 500 can be a sludge pump.

[0034] The control unit 400 is connected to the sludge concentration sensor 200, the sludge pump 500 and multiple valves 300. The control unit 400 is used to receive the detection signal from the sludge concentration sensor 200 and to control the working status of the sludge pump 500 and the valves 300.

[0035] Optionally, the control unit 400 in this embodiment can be a programmable logic controller (PLC). The working principle is: "timed triggering, pump sampling, concentration discrimination, intelligent calculation, and automatic sludge discharge." Essentially, it involves extracting mixed liquor samples from different depths within the tank, detecting changes in sludge concentration in real time, utilizing the abrupt changes in sludge concentration at the sludge-water interface to accurately calculate the sludge level range, and completing the sludge discharge operation through PLC instructions. The core of the sludge level detection device in this embodiment is the integration of pump sampling, intelligent detection, and automatic control. The system mainly consists of a sampling unit, a detection unit, a control unit, and an execution unit. The sampling unit includes sampling branches at various depths, a pneumatic valve (valve 300), and a sludge pump; the control unit is a programmable logic controller (PLC); and the execution unit includes a pneumatic valve, a sludge pump, and a sludge discharge pump, among other equipment.

[0036] Alternatively, please continue reading Figure 2 The mud level detection device 10 in this embodiment also includes an observation tank 600, which is connected to the discharge pipe of the sludge pump 500 and is used to hold mud and water for the operator to observe. The bottom of the observation tank 600 is also connected to a return pipe 700, which is used to discharge the mud and water in the observation tank 600.

[0037] The sludge level detection device in this embodiment operates as a complete closed-loop control circuit: First, the PLC (control unit 400) initiates the measurement process after intelligently interlocking the sludge scraper status according to a preset cycle or upon receiving instructions from the upper-level monitoring system, controlling the sludge pump 500 to extract sludge samples from a specific depth (achieved by controlling the opening of different valves 300). The sludge sample flows through the sludge concentration sensor 200, which reads the concentration data in real time and uploads it to the PLC. The PLC's built-in intelligent algorithm (such as dynamic inflection point recognition technology) analyzes the concentration-time curve to accurately calculate the current sludge level. Subsequently, the PLC compares the real-time sludge level with built-in process parameters (such as reasonable range, warning range, and danger range) and automatically outputs control signals to the execution unit according to the preset control strategy. For example, when the sludge level continuously exceeds the warning value, the PLC can automatically start the sludge discharge pump and run it for a timer; when the sludge level returns to the normal range, it automatically stops sludge discharge. The entire process requires no manual intervention, enabling real-time monitoring, intelligent judgment, and automatic control of the sludge level in the sedimentation tank. This effectively ensures the stability of the effluent quality and the process, while significantly reducing the intensity of manual operation and operating costs.

[0038] Sludge level detection and automatic sludge discharge control process: 1. Detection Parameter Setting: During equipment installation and commissioning, manual sampling measurements (e.g., multiple measurements near the sampling tube using a sludge interface meter or sampler) can be used to compare the measured values ​​with those from the equipment. If a systematic deviation is found in the equipment measurements (e.g., consistently 10cm shallower than manual measurements), a fixed offset can be set in the PLC program for compensation, making the final displayed sludge level closer to the true value. Analyze the concentration-time curve (essentially a concentration-depth curve) throughout the sampling process. The PLC calculates the differential (rate of change) of the concentration data in real time. The position of the sludge-water interface corresponds to the point with the largest rate of concentration change (i.e., the inflection point of the curve). Equipment installation requirements: The detection device should be installed on the edge of the tank, away from the main agitation area of ​​the sludge scraper, and the equipment should be kept powered on. According to the tank design specifications, the sludge should be divided into three zones from bottom to top, based on the tank wall height (H): reasonable zone, warning zone, and danger zone. The ranges are as follows: reasonable zone [0 m, 15% * H m], warning zone (15% * H m, 35% * H m], danger zone (35% * H m, 40% * H m]; fix the sampling tube on the edge of the tank, and insert the tube end directly to the height limit of each zone. 2. Mud level detection process: (1) Timed Trigger and Automatic Sampling (“Timed Trigger”): The sampling period is preset by a timed control device (such as a PLC). In the PLC program, the “timed trigger” of the mud level detection is interlocked with the running status (walking / stopping, current position) of the sludge scraper. The sampling time is set at the static period after the sludge scraper completes a full stroke, allowing the stirred sludge enough time to settle again and the mud-water interface to become clear. This is the best time for sampling, and the measurement data is the most accurate.

[0039] (2) Upon reaching the set time, the control device simultaneously issues two commands: first, to open the pneumatic valve; second, to start the sludge pump. The opening of the pneumatic valve means that the sampling inlet is connected to the atmosphere, forming a negative pressure extraction channel from the sampling tube inlet to the sludge pump. After the sludge pump starts, it generates suction force, continuously extracting liquid samples from a specific depth in the pool (determined by the preset installation depth of the sampling tube inlet) through the sampling tube.

[0040] (3) Sample transport and real-time detection ("pump sampling, concentration discrimination"): The extracted mixed liquid sample flows through a sludge concentration detector (usually using an online sensor based on optical or ultrasonic principles). The concentration detector performs real-time, continuous concentration monitoring of the flowing sample and transmits the concentration signal (e.g., 4-20mA, RS485, etc.) instantaneously to the control device. Data interpretation and sludge level calculation ("concentration discrimination, intelligent calculation"): The control device (equipped with data acquisition and processing functions) continuously records and analyzes the concentration data. Its core discrimination logic is based on a physical phenomenon: there is an interface with a rapid change in concentration between the clear water layer (supernatant) and the sludge layer.

[0041] a. Supernatant zone: In the initial stage of sampling, if the sampling tube inlet is located above the sludge interface, the sampled supernatant is clearer and has a low and stable concentration.

[0042] b. Transition zone: As extraction continues and the liquid level drops, when the sampling tube inlet comes into contact with the sludge interface, the proportion of sludge in the extracted sample suddenly increases, and the concentration value shows a rapid and significant jump.

[0043] (4) Automatic interlocking sludge discharge control: The PLC compares the calculated real-time mud level with the preset range and executes the following automatic control: a. When the mud level is within the reasonable range [0 meters, 15% * H meters], no action is taken. When the mud level is normal, the system enters standby mode, waiting for the next cycle.

[0044] b. When the sludge level is within the warning range (15% * H meters, 35% * H meters), an early warning is triggered and timed sludge discharge is initiated. The PLC automatically starts the sludge discharge pump and triggers a fixed sludge discharge time T (e.g., 10-15 minutes; the T value needs to be verified on-site based on the sludge concentration and sludge discharge pump flow rate). The pump automatically stops after the time is up. This measure aims to gradually reduce the sludge layer thickness.

[0045] c. When the mud level is in the danger zone (35% * H meters, 40% * H meters), an emergency alarm is triggered and extended mud discharge is initiated. The PLC immediately starts the mud discharge pump and triggers a longer fixed mud discharge time T' (e.g., 25-35 minutes), or continues mud discharge until the mud level is continuously monitored and falls below the warning zone before stopping. At the same time, an audible and visual alarm is sent to the central control room.

[0046] (5) Measurement completion and system standby: After one sludge discharge cycle is completed, the system automatically enters the next detection cycle. If the sludge level is still in the warning or danger range in the next detection cycle, the sludge discharge procedure will be triggered again until the sludge level returns to normal.

[0047] The mud level detection device in this application embodiment has the following advantages and improvements: Compared to traditional sludge discharge methods that rely on experience-based judgment, this application presents an automatic sludge level control system. Through sludge level detection, it can accurately and in real-time monitor the sludge interface position, thereby providing reliable data support for precise control of sludge discharge operations, strengthening the linkage with the process, and finally realizing closed-loop control of the sludge level in the sedimentation tank through an automatic sludge discharge interlock function based on sludge level height. This truly achieves full automation of "detection-judgment-execution", greatly reducing the burden of manual operation and improving process stability.

[0048] Addressing the shortcomings of traditional detection equipment in complex water treatment configurations such as V-type sedimentation tanks, inclined tube sedimentation tanks, and inclined plate sedimentation tanks—including large blind spots, susceptibility to interference, and installation limitations—this system demonstrates outstanding adaptability and reliability. Its pump-suction sampling method can directly and quickly acquire representative sludge-water mixed samples, overcoming measurement distortions caused by internal component obstructions, water flow turbulence, or air bubbles. This enables accurate measurement of sludge levels in areas difficult to monitor using traditional methods. This technology provides water plant operators with intuitive and reliable process judgment, effectively avoiding sludge control errors due to missing or biased data, and comprehensively improving water quality safety assurance capabilities and the resilience of wastewater treatment systems to load fluctuations.

[0049] This mud level detection device has the following significant advantages: a. Automation and Intelligence: It integrates automatic sludge discharge interlock control function based on sludge level monitoring. The entire process is automatically completed by the timer controller and can be integrated into the central control system to realize remote monitoring, data recording and trend analysis, providing data support for process optimization. It realizes closed-loop control of sludge level in sedimentation tank, greatly reduces the intensity of manual operation and improves management efficiency.

[0050] b. Strong anti-interference capability: It avoids the sensor being directly immersed in sludge, fundamentally solving the industry problem of probes being easily contaminated, easily adhering, and requiring frequent cleaning.

[0051] c. High measurement accuracy: The interface is determined by detecting abrupt changes in concentration, rather than relying on absolute concentration values. This reduces the impact of medium changes, bubbles, liquid color, etc., resulting in more reliable results. Easy maintenance: The main moving parts are the sludge pump, pneumatic valves, and programmable logic controller (PLC), all mature and reliable industrial products, making maintenance and replacement simple and cost-effective.

[0052] d. Manual Priority Mode: The system should be equipped with a manual / automatic switch. In manual mode, operators can disregard the automatic control logic and directly force the start and stop of the sludge pump for maintenance, debugging, or handling of abnormal operating conditions.

[0053] e. Wide applicability: The principle is universal and it can be widely applied to tanks of various sizes, shapes and processes, such as primary sedimentation tanks, secondary sedimentation tanks, thickening tanks, equalization tanks, etc.

[0054] f. Improve process operation stability: Under the premise of ensuring stable effluent quality, enhance the operation stability of the sedimentation unit, effectively avoid sludge expansion or energy consumption caused by insufficient or excessive sludge discharge, give full play to the water flow capacity of the sedimentation tank under different hydraulic conditions, and significantly improve the tank capacity utilization and overall process stability.

[0055] 2. The impact of the mud level detection device in this application embodiment on the process: (1) Accurately grasping the sludge level range is of crucial guiding significance for the refined operation of wastewater treatment processes. Traditional sludge removal methods in sedimentation tanks mostly adopt timed and quantitative experience-based operations, which can only make rough judgments based on post-event indicators such as sludge concentration and upper effluent quality, resulting in significant lag. Its core drawback is that it is impossible to monitor the true height of the sedimentary sludge layer in the tank in real time, making it difficult to assess the settling effect of flocs after chemical dosing and to scientifically guide the adjustment of sludge removal volume. After installing the sludge level measuring device, accurate and real-time monitoring of the sludge layer interface is achieved. Operators can directly judge the changes in water load and sludge removal effect based on this, transforming sludge removal operations from "experience-driven" to "data-driven". This significantly improves the targeting and efficiency of sludge removal and optimizes the operating conditions of the sludge removal pump. Practice shows that the application of this device can shorten the average daily operating time of the sludge removal pump by 2 hours, effectively reducing equipment energy consumption and operating costs while ensuring stable effluent quality.

[0056] (2) Through continuous sludge level monitoring data, the actual operating load of the sedimentation tank can be accurately quantified and analyzed. By comparing the measured sludge level with the designed hydraulic surface load of the tank, the matching degree between the actual treatment efficiency and the design capacity of the sedimentation tank can be accurately evaluated, thereby providing a scientific basis for tapping the potential of the tank and optimizing operating parameters, and ensuring that its treatment capacity is maximized.

[0057] In addition, this data system can simultaneously verify the actual treatment capacity of sedimentation tanks when faced with different water qualities (such as changes in influent concentration and floc formation), providing precise guidance for daily process control and accumulating valuable first-hand data support for future process upgrades and expansion designs.

[0058] (3) Reduce chemical consumption in the later stages. Sludge level measurement provides data support for the growth period, ensuring stable production operation. According to operational data analysis, the SS in the AO tank influent decreased to <50 mg / L, a 37.5% reduction compared to when sludge level was not monitored (80 mg / L), increasing the removal efficiency of the biological treatment tank by 3%. Based on the COD of 900 mg / L in the primary sedimentation tank effluent, a 3% increase in removal efficiency can reduce COD by 30 mg / L, reducing the dosage of deep treatment water purification agent by 0.05 kg / m³. 3 .

[0059] Reduce biological sludge production. Sludge level measurement guides the sludge discharge time and volume in different sedimentation tanks, improving effluent quality, reducing SS in the downstream effluent by approximately 30 mg / L, and reducing the sludge discharge volume of the biological system by 2100 kg / day (based on a treatment capacity of 70,000 cubic meters / day).

[0060] (4) Reduced labor costs. Compared with traditional manual sampling, the use of a pump-suction mud level detection device significantly improves detection efficiency. According to the current process, sampling is carried out 3 times a day, and the sampling time is reduced from 18 minutes / time to 0 minutes / time, which saves 51 minutes per day.

[0061] The mud level detection device in this application embodiment solves the problems of existing technologies such as susceptibility to interference, frequent maintenance, and inability to achieve closed-loop control, and provides a mud level management solution that is accurate in measurement, has strong anti-interference ability, stable in operation, and can achieve fully automatic control.

[0062] In wastewater treatment processes, sedimentation tanks are crucial structures for achieving solid-liquid separation of mixed liquor, clarifying effluent, and concentrating and returning sludge. The height of the sludge interface (i.e., sludge level) within the tank is a critical operating parameter. Accurate and real-time monitoring and control of this level are essential for optimizing sedimentation tank operation, preventing sludge loss, ensuring effluent quality, and precisely controlling the sludge return ratio and discharge volume. This sludge level detection device can stably collect sludge level data over a long period, further guiding the optimization of sludge discharge strategies, adjusting hydraulic surface loading, systematically evaluating the actual operating load of the radial flow sedimentation tank against the design specifications, scientifically verifying the rationality and applicable boundaries of the hydraulic load values, and ultimately clarifying the safe upper limit and efficiency lower limit for this type of tank operation.

[0063] The sludge level detection device provided in this application embodiment has the characteristics of simple structure and high measurement efficiency. This detection device can not only measure the sludge level with high precision, but also automatically execute process control commands based on the measurement results, realizing the intelligent and automated operation of the sedimentation tank. By measuring the sludge level height and its changing trend in the sedimentation tank at regular intervals and with precision, this detection device objectively reflects the sludge settling characteristics and sludge-water separation state, quickly determines the sludge layer thickness, and provides key data support for the dynamic control of the wastewater treatment process.

[0064] The above description is only a part of the embodiments of the present invention and does not limit the scope of protection of the present invention. Any equivalent device or equivalent process transformation made based on the content of the present invention specification and drawings, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A mud level detection device, characterized in that, The sludge level detection device includes a sampling tube and a sludge concentration sensor. The sampling tube includes a main sampling tube and multiple sampling branch tubes connected to the main sampling tube. The multiple sampling branch tubes are inserted into the sludge tank to be tested. The lengths of the multiple sampling branch tubes are different, and they are used to sample the sludge and water at different depths in the sludge tank to be tested. The sludge concentration sensor is connected to the sampling tube and is used to detect the sludge concentration of the sludge and water flowing through the sampling tube.

2. The mud level detection device according to claim 1, characterized in that, The mud level detection device also includes a suction device, which is connected to the sampling main pipe and is used to provide the driving force for suctioning mud and water.

3. The mud level detection device according to claim 2, characterized in that, The suction device is a sludge pump.

4. The mud level detection device according to claim 1, characterized in that, The sludge concentration sensor is installed on the sampling header and is used to detect the sludge concentration of the sludge water flowing through the sampling header.

5. The mud level detection device according to claim 2, characterized in that, The mud level detection device also includes a valve, which is located on the sampling branch pipe.

6. The mud level detection device according to claim 5, characterized in that, Each of the aforementioned sampling branches is equipped with one of the aforementioned valves.

7. The mud level detection device according to claim 6, characterized in that, The valve is a pneumatic valve.

8. The mud level detection device according to claim 3, characterized in that, The sludge level detection device also includes an observation tank, which is connected to the discharge pipe of the sludge pump and is used to hold sludge and water for the operator to observe.

9. The mud level detection device according to claim 8, characterized in that, The mud level detection device also includes a return pipe, which is connected to the bottom of the observation tank and is used to drain the mud and water in the observation tank.

10. The mud level detection device according to claim 3, characterized in that, The sludge level detection device also includes a control unit, which is connected to the sludge concentration sensor and the sludge pump, and is used to receive the detection signal from the sludge concentration sensor and control the working status of the sludge pump.

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