Automatic treatment control system for sludge water of waterworks

Abstract

The utility model discloses a kind of automatic treatment control system of sewage treatment plant sludge water, it is related to sewage treatment plant sludge water treatment technical field, including distribution well, flocculation sedimentation tank, sludge conditioning tank, thickening tank, balance tank, recovery tank, dewatering machine system, PAM dosing system and PLC control system;Through sludge conditioning tank ultrasonic level gauge, thickening tank on-line turbidimeter, balance tank MLSS instrument, balance tank ultrasonic level gauge, balance tank electric butterfly valve and the closed-loop control of PLC control system, realize function linkage;By setting automatic cleaning drainage sampling device, realize the accurate detection of reclaimed water quality under the intermittent reuse condition of thickening tank supernatant, optimize the linkage control of system.The utility model realizes the full-automatic operation of sludge, concentration, dosing, discharge, dehydration by integrating process monitoring instrument, equipment linkage optimization, PLC control logic upgrade and central control system integration.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology in waterworks, and more specifically to the field of an automatic sludge treatment control system for waterworks. Background Technology

[0002] Traditional sludge treatment systems in waterworks typically consist of a sludge equalization tank, a thickening tank, a balancing tank, a dewatering machine, and a PAM dosing system. They rely on manual operation and localized equipment control, and therefore have the following technical drawbacks:

[0003] (1) Low level of automation:

[0004] 1) The sludge mixture lift pump in the equalization tank is not linked with the thickener, and the thickener has no online liquid level or sludge level monitoring instruments, so manual sludge feeding and thickening are required.

[0005] 2) The PAM dosing pump is not linked with the sludge mixed liquor booster pump, so both sludge thickening and chemical dosing need to be done manually, resulting in low dosing efficiency.

[0006] 3) The sludge inlet valve of the balance tank is a manual gate valve, which is not linked to the liquid level and sludge concentration. It requires manual operation of the valve on site, resulting in frequent manual intervention.

[0007] 4) The sludge centrifugal dewatering system is not linked to the front end, and the centrifuge needs to be started and stopped manually.

[0008] (2) Lack of process monitoring:

[0009] The effluent channel of the thickener is not equipped with an online turbidity meter, making it impossible to monitor the recycled water quality in real time. The recycling process relies on manual monitoring, which means that there is no early warning when the turbidity of the recycled water is too high, posing a risk of water quality shock. The sludge concentration in the balancing tank is not linked to the sludge inlet valve, resulting in delayed control.

[0010] (3) Equipment defects:

[0011] The original system had insufficient analog input channels for the PLC, limited access to newly added instrument signals, and rigid control logic.

[0012] (4) High operation and maintenance costs:

[0013] Frequent manual operations (such as manual sludge removal, manual recycling, and valve adjustment) result in severe data silos, making remote monitoring and predictive maintenance impossible.

[0014] The sludge wastewater treatment system lacks instrumentation for each production stage, including chemical dosing, sludge inlet, and sludge outlet. Equipment is not interlocked, requiring extensive manual on-site operation, resulting in a low level of automation and intelligence. Existing technical upgrade solutions are mostly limited to upgrading single equipment (such as replacing the sludge mixed liquor lift pump), failing to systematically address the issue of full-process automation and intelligent linkage. For example, while publicly available technologies mention adding a sludge interface meter, it does not form a closed-loop control with the lift pump and chemical dosing system, leading to insufficient control accuracy. Utility Model Content

[0015] The purpose of this utility model is to provide an automatic treatment and control system for sludge discharge from waterworks in order to solve the above-mentioned technical problems.

[0016] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0017] One aspect of this utility model provides an automatic treatment and control system for sludge discharge from a waterworks, including a water distribution well, a flocculation sedimentation tank, a sludge equalization tank, a thickening tank, a balancing tank, a recovery water tank, a dewatering machine system, a PAM dosing system, and a PLC control system.

[0018] The distribution well, flocculation sedimentation tank, sludge equalization tank, thickening tank, balance tank, and dewatering system are set up in sequence; the recovery water tank and PAM dosing system are connected to the thickening tank respectively;

[0019] The sludge equalization tank is equipped with a sludge mixing liquor lift pump and an ultrasonic level gauge, both of which are connected to the PLC control system.

[0020] The concentration tank is equipped with an online turbidity meter and an automatic cleaning and drainage sampling device;

[0021] The balance tank is equipped with an MLSS instrument, an ultrasonic level gauge, and an electric butterfly valve for sludge inlet, all of which are connected to the PLC control system.

[0022] The dewatering system is equipped with a centrifugal dewatering machine and a sludge feed screw pump;

[0023] The PAM dosing system is equipped with a screw pump that is connected to the PLC control system and can automatically add PAM.

[0024] By using an online turbidity meter in the thickener, an MLSS meter in the balance tank, an ultrasonic level gauge in the balance tank, an electric butterfly valve in the balance tank, and a PLC control system in a closed loop, a fully automated control system is formed, covering the entire process from sludge inlet, thickening, dosing, discharge, and dewatering. This effectively solves the problems of lack of instruments, high dependence on manual labor, and insufficient control precision in traditional sludge wastewater treatment systems, and significantly improves treatment efficiency and operational reliability.

[0025] Hardware upgrade: Install an online turbidity meter in the effluent channel of the thickener, and equip it with an online turbidity meter automatic cleaning and drainage sampling device to sample and detect the quality of the recycled water in real time. Stop the sludge mixed liquor lift pump when the threshold exceeds the process requirement turbidity.

[0026] The PLC control logic has been upgraded as follows: First, the sludge mixed liquor lift pump is linked with the turbidity meter of the thickener effluent to achieve dynamic adjustment of the sludge feed rate; second, a PAM dosing system is added and softly linked with the sludge mixed liquor lift pump to ensure that sludge feed and dosing are synchronized, thereby improving the flocculation effect according to process requirements; third, the electric butterfly valve for sludge feed into the balancing tank is linked with the MLSS meter and ultrasonic level gauge to achieve automatic sludge feed into the balancing tank; and fourth, the sludge concentration MLSS meter is linked with the sludge dewatering system to provide real-time reminders to meet the requirements for sludge centrifugal dewatering.

[0027] Enhanced central control system functionality: A visual monitoring interface was developed based on the InTouch platform, displaying real-time parameters such as turbidity of the thickener effluent, MLSS of the balancing tank, and liquid level, and integrating equipment status (pump start / stop, valve opening, etc.). Multi-level alarm rules (such as excessive turbidity or abnormal sludge level) are set to trigger alarms in the central control system.

[0028] In one embodiment, the sludge equalization tank is equipped with two sludge mixed liquor lift pumps and two ultrasonic level gauges; the thickening tank is equipped with one online turbidity meter and one automatic cleaning and drainage sampling device; the balancing tank is equipped with one MLSS meter, one ultrasonic level gauge and one electric butterfly valve for sludge inlet; the dewatering system is equipped with one centrifugal dewatering machine and two screw pumps for sludge inlet; and the PAM dosing system is equipped with three screw pumps and one electromagnetic flow meter.

[0029] In one embodiment, the sludge solution in the sludge equalization tank comes from the solution generated by the automatic sludge discharge from the flocculation sedimentation tank; the sludge equalization tank is equipped with a sludge mixed liquor lift pump for lifting the sludge solution to the thickening tank, and the start / stop control signal of the sludge mixed liquor lift pump is connected to the PLC control system.

[0030] In one embodiment, the ultrasonic level gauge in the sludge equalization tank is connected to the PLC control system via a 4-20mA analog signal to monitor the liquid level in the sludge equalization tank in real time.

[0031] In one embodiment, an online turbidity meter is installed in the effluent channel of the thickener and is connected to the PLC control system via a 4-20mA analog signal to monitor the turbidity of the supernatant in real time. The sludge mixture lift pump in the sludge equalization tank is linked with the online turbidity meter in the thickener to achieve dynamic adjustment of the sludge feed rate.

[0032] In one embodiment, the MLSS meter of the balancing tank is installed in the middle of the balancing tank to detect the sludge concentration and transmit it to the PLC control system via a 4-20mA analog signal; the ultrasonic level gauge of the balancing tank is located at the top of the balancing tank to monitor the liquid level in real time and is connected to the PLC control system via a 4-20mA analog signal.

[0033] In one implementation, the electric butterfly valve for sludge inlet of the balancing tank replaces the original manual gate valve of the balancing tank, receives commands from the PLC control system to control its opening and closing, and provides real-time feedback to the PLC on the valve opening; the screw pump of the PAM dosing system is used for PAM dosing, and the start / stop control signal of the screw pump of the PAM dosing system is connected to the PLC control system; the electromagnetic flowmeter of the PAM dosing system is connected to the PLC control system through a 4-20mA analog signal to monitor the PAM dosing flow rate in real time.

[0034] In one implementation, the centrifugal dewatering machine issues a sludge preparation reminder after the PLC control system determines the values ​​of the MLSS meter and ultrasonic level gauge in the balance tank.

[0035] In one implementation, the PLC control system integrates a power supply, CPU, AI / AO module (for instrument signal acquisition), DI / DO module (for equipment control), data memory, and Ethernet communication module (for interacting with the central control system).

[0036] In one implementation, a central control system is also included. The central control system uses InTouch host computer software, which is deployed on the central control room server. It communicates with the PLC control system via TCP / IP protocol and integrates real-time data monitoring, alarm, and historical data storage functions. The main interface displays the real-time value of the sludge equalization tank liquid level, the status of the sludge mixed liquor lift pump, the real-time value of the turbidity of the thickener effluent, the real-time value of the MLSS meter liquid level in the balance tank, and the opening status of the sludge inlet electric butterfly valve.

[0037] The specific implementation process is as follows:

[0038] The central control system selects the sludge mixed liquor lift pump (1# or 2#), ultrasonic level gauge (1# or 2#), and screw pump (2# or 3#) of the PAM dosing system for the sludge equalization tank. When the sludge equalization tank level reaches the pump start level of the selected level gauge, the selected sludge mixed liquor lift pump and the selected screw pump of the PAM dosing system are started. When the turbidity of the thickener effluent reaches the upper limit, the sludge mixed liquor lift pump and the screw pump of the PAM dosing system are stopped. After the pump stops, if the abnormal turbidity start interval is exceeded, the pump is restarted. If the forced operation time exceeds the abnormal turbidity start judgment time, and the turbidity of the thickener is lower than the upper limit, the sludge mixed liquor lift pump and the screw pump of the PAM dosing system continue to run. If the turbidity is higher than the upper limit, the pump is stopped and the screw pump is restarted again, and the cycle is repeated.

[0039] Once the sludge solution in the balancing tank meets the standards, the system will remind the dewatering machine to start sludge. When the sludge concentration in the balancing tank reaches the process-set threshold through real-time monitoring by an online MLSS instrument, the system will automatically remind the centrifugal dewatering machine to start.

[0040] The PAM dosing system operates automatically, and the precise linkage control between the sludge mixed liquor lift pump and the PAM dosing system enables fully automated operation of the entire process. When the sludge lift pump (rated flow rate 10m³ / h) starts, the screw pump of the PAM dosing system starts simultaneously to ensure strict synchronization between sludge intake and chemical dosing. The PAM dosing ratio is a fixed value based on the fixed flow rate of the sludge mixed liquor lift pump according to process requirements.

[0041] The sludge inlet electric valve of the balancing tank operates automatically. The sludge inlet electric butterfly valve of the balancing tank is linked with the MLSS instrument and ultrasonic level gauge of the balancing tank to realize automatic sludge inlet of the balancing tank and reminder of sludge centrifugation dewatering after the sludge concentration reaches the standard. When the liquid level of the balancing tank reaches the valve opening level and the sludge concentration is above the process threshold, the No. 1 balancing tank sludge inlet valve opens the valve according to the automatic operation opening setting value. When the liquid level of the balancing tank reaches the valve closing level or the sludge concentration is below the process threshold, the No. 1 balancing tank sludge inlet valve closes.

[0042] The server implements data storage and management. The local server builds a water affairs data center to realize the fusion storage, analysis and remote traceability of multi-source data of the waterworks sludge system. Specifically, it includes multi-source data fusion storage; multi-source data fusion storage, the local server integrates the liquid level of the sludge equalization tank, the turbidity of the thickening tank effluent, the MLSS value of the balance tank and the ultrasonic liquid level, and uses a time-series database for high-frequency data storage, supporting historical data query and trend analysis.

[0043] In one embodiment, an automatic cleaning drainage sampling device is installed in the overflow area of ​​the thickener weir for online turbidity meter sampling of the thickener supernatant. The automatic cleaning drainage sampling device consists of two square sampling boxes, one a stabilization zone on the left and the other a detection zone on the right. The top of the stabilization zone is equipped with a nozzle for connecting to the plant's own water supply pipeline, and the middle of the stabilization zone is equipped with a float level switch. A perforated baffle is installed at the connection between the stabilization zone and the detection zone. The upper part of the detection zone is equipped with a turbidity meter mounting bracket and an outlet weir, and the bottom of the detection zone is equipped with a drain pipe with a solenoid valve. The area of ​​the stabilization zone is three times that of the detection zone, and the perforation rate of the perforated baffle is 50%, allowing the water flow to smoothly transition into the detection zone.

[0044] Both the bottom of the stabilization zone and the detection zone are designed with an inclination angle of ≥5° to make it easier for the sludge at the bottom to be drained. The inner wall is provided with rounded chamfers to prevent sludge from accumulating in dead corners.

[0045] Specifically, the nozzles are connected to the plant's own water supply pipelines, and the solenoid valves control the automatic start of flushing to wash away residual pollutants; the float level switch in the steady flow zone is linked to the online turbidity meter, and the online turbidity meter goes into sleep mode when the liquid level is low; the detection zone is equipped with an outlet weir, which can automatically adjust the weir height to control the water level in the detection zone.

[0046] The supernatant from the concentration tank enters the sampling box from the top of the steady flow zone, passes through a perforated baffle, enters the detection zone, and then overflows through the effluent weir. The online turbidity meter is installed at approximately halfway through the detection zone, with the probe's emission window plane parallel to the water flow direction to reduce particle impact. It is installed 100mm above the bottom of the tank to prevent sediment buildup. The system is designed to automatically open the solenoid valve before the nozzle periodically during supernatant recovery intervals, with a set opening duration, which in turn triggers the drain solenoid valve to automatically flush the tank and turbidity meter, ensuring accurate turbidity measurement. The float level switch is set to maintain a low liquid level greater than 100mm to ensure the online turbidity meter is submerged and does not dry-burn.

[0047] The beneficial effects of this utility model are as follows:

[0048] 1. Fully automated process: The entire process of sludge feeding, thickening, dosing, and sludge discharge is automatically controlled, reducing manual intervention by 80% and improving operating efficiency by 100%. The synchronization accuracy of PAM dosing is improved to 100%, eliminating chemical waste.

[0049] 2. Precise Monitoring and Early Warning: The turbidity meter at the effluent of the thickener enables real-time monitoring of effluent water quality, with an early warning response time of 0 seconds for excessive turbidity in the recycled water. The sludge inlet valve of the balancing tank is linked to the MLSS meter, ensuring zero error in sludge concentration control.

[0050] 3. Structural optimization and energy efficiency improvement: The settling efficiency of the thickener is increased by 40%, and the problem of horizontal short-flow is completely eliminated.

[0051] 4. Intelligent operation and maintenance support: The central control system supports historical data backtracking to ensure efficient and safe operation and maintenance decisions. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0053] Figure 1 This is a schematic diagram of the structure of an automatic treatment and control system for sludge discharge from a waterworks according to this utility model.

[0054] Figure 2This is a schematic diagram of the automatic cleaning and drainage sampling device of an automatic treatment and control system for sludge discharge from a waterworks, according to this utility model. Detailed Implementation

[0055] To make the technical problems, technical solutions, and technical effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0056] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0057] Example 1

[0058] like Figure 1 As shown, this embodiment provides an automatic treatment and control system for sludge discharge from a waterworks, including a water distribution well, a flocculation sedimentation tank, a sludge equalization tank, a thickening tank, a balancing tank, a recycled water tank, a dewatering system, a PAM dosing system, and a PLC control system.

[0059] The distribution well, flocculation sedimentation tank, sludge equalization tank, thickening tank, balance tank, and dewatering system are set up in sequence; the recovery water tank and PAM dosing system are connected to the thickening tank respectively;

[0060] The sludge equalization tank is equipped with a sludge mixing liquor lift pump and an ultrasonic level gauge, both of which are connected to the PLC control system.

[0061] The concentration tank is equipped with an online turbidity meter and an automatic cleaning and drainage sampling device;

[0062] The balance tank is equipped with an MLSS instrument, an ultrasonic level gauge, and an electric butterfly valve for sludge inlet, all of which are connected to the PLC control system.

[0063] The dewatering system is equipped with a centrifugal dewatering machine and a sludge screw pump;

[0064] The PAM dosing system is equipped with a screw pump that is connected to the PLC control system and can automatically add PAM.

[0065] The intelligent linkage of the sludge mixed liquor lift pump, the screw pump of the PAM dosing system, and the sludge inlet electric butterfly valve in the balance tank is achieved through closed-loop control of the online turbidity meter in the thickening tank, the MLSS meter in the balance tank, the ultrasonic level gauge in the balance tank, the electric butterfly valve in the balance tank, and the PLC control system.

[0066] Specifically, the system features automatic pump shutdown protection for excessive turbidity, automatic start-up of the screw pump in the PAM dosing system, and interlocking opening and closing of the electric butterfly valve in the balancing tank based on both liquid level and concentration parameters. This forms a fully automated control system that effectively solves the problems of lack of instruments, high dependence on manual labor, and insufficient control precision in traditional sludge treatment systems, significantly improving treatment efficiency and operational reliability.

[0067] Hardware upgrade: Install an online turbidity meter in the effluent channel of the thickener, and configure an online turbidity meter automatic cleaning and drainage sampling device to sample and detect the quality of the recycled water in real time. Stop the sludge mixed liquor lift pump when the threshold exceeds the process requirement turbidity.

[0068] PLC control logic upgrade: The sludge mixed liquor lift pump is linked to the turbidity meter of the thickener effluent to achieve dynamic adjustment of the sludge feed rate. A PAM dosing system is added with soft linkage to the sludge mixed liquor lift pump to ensure synchronous sludge feed and dosing, improving flocculation effect according to process requirements. The electric butterfly valve for sludge feed into the balancing tank is linked to the MLSS meter and ultrasonic level gauge to achieve automatic sludge feed into the balancing tank and reminders for sludge centrifugation dewatering after the sludge concentration reaches the standard.

[0069] Enhanced central control system functionality: A visual monitoring interface was developed based on the InTouch platform, displaying real-time parameters such as turbidity of the thickener effluent, MLSS of the balancing tank, and liquid level, and integrating equipment status (pump start / stop, valve opening, etc.). Multi-level alarm rules (such as excessive turbidity or abnormal sludge level) are set to trigger alarms in the central control system.

[0070] Example 2

[0071] This embodiment is a further optimization based on Embodiment 1, specifically:

[0072] The sludge equalization tank is equipped with two sludge mixed liquor lift pumps and two ultrasonic level gauges.

[0073] The concentration tank is equipped with one online turbidity meter and one automatic cleaning and drainage sampling device;

[0074] The balance tank is equipped with one MLSS instrument, one ultrasonic level gauge and one electric butterfly valve for sludge inlet.

[0075] The dewatering system is equipped with one centrifugal dewatering machine and two sludge feed screw pumps;

[0076] The PAM dosing system is equipped with three screw pumps and one electromagnetic flowmeter.

[0077] In one embodiment, the sludge solution in the sludge equalization tank comes from the solution generated by the automatic sludge discharge from the flocculation sedimentation tank; the sludge equalization tank is equipped with a sludge mixed liquor lift pump for lifting the sludge solution to the thickening tank, and the start / stop control signal of the sludge mixed liquor lift pump is connected to the PLC control system.

[0078] Example 3

[0079] This embodiment is a further optimization based on Embodiment 1, specifically:

[0080] The ultrasonic level gauge in the sludge equalization tank is connected to the PLC control system via a 4-20mA analog signal to monitor the liquid level in the sludge equalization tank in real time.

[0081] The online turbidity meter in the thickener is installed in the effluent channel of the thickener and is connected to the PLC control system via a 4-20mA analog signal to monitor the turbidity of the supernatant in real time. The sludge mixed liquor lift pump in the sludge equalization tank is linked with the online turbidity meter in the thickener to realize dynamic adjustment of the sludge feed rate.

[0082] In one embodiment, the MLSS meter of the balancing tank is installed in the middle of the balancing tank to detect the sludge concentration and transmit it to the PLC control system through a 4-20mA analog signal;

[0083] The ultrasonic level gauge in the balancing tank is located at the top of the tank and monitors the liquid level in real time. It is connected to the PLC control system via a 4-20mA analog signal.

[0084] The electric butterfly valve for sludge inlet in the balance tank replaces the original manual gate valve. It receives commands from the PLC control system to control the opening and closing of the valve and provides real-time feedback to the PLC on the valve opening.

[0085] The screw pump of the PAM dosing system is used for PAM dosing, and the start / stop control signal of the screw pump of the PAM dosing system is connected to the PLC control system.

[0086] The electromagnetic flowmeter of the PAM dosing system is connected to the PLC control system via a 4-20mA analog signal to monitor the PAM dosing flow rate in real time.

[0087] The PLC control system integrates a power supply, CPU, AI / AO module (for instrument signal acquisition), DI / DO module (for equipment control), data memory, and Ethernet communication module (for interaction with the central control system).

[0088] It also includes a central control system, which uses InTouch host computer software and is deployed on the central control room server. It communicates with the PLC control system via TCP / IP protocol and integrates real-time data monitoring, alarm, and historical data storage functions. The main interface displays the real-time value of the sludge equalization tank liquid level, the status of the sludge mixed liquor lift pump, the real-time value of the turbidity of the thickener effluent, the real-time value of the MLSS meter liquid level in the balance tank, and the opening status of the sludge inlet electric butterfly valve.

[0089] The specific implementation is as follows:

[0090] The central control system selects the sludge mixed liquor lift pump (1# or 2#), ultrasonic level gauge (1# or 2#), and screw pump (2# or 3#) of the PAM dosing system for the sludge equalization tank. When the sludge equalization tank level reaches the pump start level of the selected level gauge, the selected sludge mixed liquor lift pump and the selected screw pump of the PAM dosing system are started. When the turbidity of the thickener effluent reaches the upper limit, the sludge mixed liquor lift pump and the screw pump of the PAM dosing system are stopped. After the pump stops, if the abnormal turbidity start interval is exceeded, the pump is restarted. If the forced operation time exceeds the abnormal turbidity start judgment time, and the turbidity of the thickener is lower than the upper limit, the sludge mixed liquor lift pump and the screw pump of the PAM dosing system continue to run. If the turbidity is higher than the upper limit, the pump is stopped and the screw pump is restarted again, and the cycle is repeated.

[0091] Once the sludge solution in the balancing tank meets the standards, the system will remind the dewatering machine to start sludge. When the sludge concentration in the balancing tank reaches the process-set threshold through real-time monitoring by an online MLSS instrument, the system will automatically remind the centrifugal dewatering machine to start.

[0092] The PAM dosing system operates automatically, and the precise linkage control between the sludge mixed liquor lift pump and the PAM dosing system enables fully automated operation of the entire process. When the sludge lift pump (rated flow rate 10m³ / h) starts, the screw pump of the PAM dosing system starts simultaneously to ensure strict synchronization between sludge intake and chemical dosing. The PAM dosing ratio is a fixed value based on the fixed flow rate of the sludge mixed liquor lift pump according to process requirements.

[0093] The sludge inlet electric valve of the balancing tank operates automatically. The sludge inlet electric butterfly valve of the balancing tank is linked with the MLSS instrument and ultrasonic level gauge of the balancing tank to realize automatic sludge inlet of the balancing tank and reminder of sludge centrifugation dewatering after the sludge concentration reaches the standard. When the liquid level of the balancing tank reaches the valve opening level and the sludge concentration is above the process threshold, the No. 1 balancing tank sludge inlet valve opens the valve according to the automatic operation opening setting value. When the liquid level of the balancing tank reaches the valve closing level or the sludge concentration is below the process threshold, the No. 1 balancing tank sludge inlet valve closes.

[0094] The server implements data storage and management. The local server builds a water affairs data center to realize the fusion storage, analysis and remote traceability of multi-source data of the waterworks sludge system. Specifically, it includes multi-source data fusion storage; multi-source data fusion storage, the local server integrates the liquid level of the sludge equalization tank, the turbidity of the thickening tank effluent, the MLSS value of the balance tank and the ultrasonic liquid level, and uses a time-series database for high-frequency data storage, supporting historical data query and trend analysis.

[0095] Example 4

[0096] This embodiment is a further optimization based on embodiment 3, specifically:

[0097] An automatic cleaning and drainage sampling device is installed in the overflow area of ​​the thickener weir for online turbidity meter sampling of the thickener supernatant. The sampling device consists of two square sampling boxes: a flow stabilization zone 1 on the left and a detection zone 2 on the right. A nozzle 3 is installed at the top of the flow stabilization zone, and a float level switch 4 is installed in the middle of the flow stabilization zone. A perforated baffle 5 is installed between the flow stabilization zone and the detection zone. A turbidity meter mounting bracket 6 and an outlet weir 7 are installed at the top of the detection zone, and a drain pipe 8 and a solenoid valve 9 are installed at the bottom of the detection zone.

[0098] A flow stabilization zone 1 is added at the front end of detection zone 2. The area of ​​the flow stabilization zone is 3 times that of the detection zone. A perforated baffle 5 is set in the middle with an opening rate of 50%, so that the water flow can smoothly transition into the detection zone.

[0099] The bottom of the stabilization zone 1 and the detection zone 2 are designed with an inclination angle of ≥5° to make it easier to drain the sludge at the bottom. The inner wall is provided with rounded chamfers to prevent sludge from accumulating in dead corners.

[0100] Specifically, a nozzle 3 is installed at the top of the stabilizing flow zone, connected to the plant's own water supply pipeline. An electromagnetic valve controls the automatic flushing to remove residual contaminants. A float level switch 4 is installed in the stabilizing flow zone, linked to an online turbidity meter. Low water levels trigger the meter's sleep protection. An outlet weir 7 is installed in the detection zone, automatically adjusting the weir height to control the water level. A bottom drain pipe 8 is installed in the detection zone, equipped with a electromagnetic valve 9.

[0101] The supernatant from the concentration tank enters the sampling box from the upper side of the steady flow zone 1, passes through the perforated baffle 5, enters the detection zone, and then overflows through the effluent weir 7. The online turbidity meter is installed at approximately half the height of the detection zone, with the probe's emission window plane parallel to the water flow direction to reduce particle impact. It is installed 100mm above the bottom of the tank to prevent sediment buildup. The system is set to automatically open the solenoid valve before the nozzle periodically during the supernatant recovery interval, with a set opening duration, which in turn triggers the drain solenoid valve to automatically flush the tank and turbidity meter, ensuring accurate turbidity meter readings. The float level switch is set to maintain a low liquid level greater than 100mm to ensure the online turbidity meter is submerged and does not dry-burn.

Claims

1. An automatic treatment and control system for sludge discharge water from a waterworks, characterized in that, It includes a water distribution well, flocculation sedimentation tank, sludge equalization tank, thickening tank, balancing tank, recycled water tank, dewatering system, PAM dosing system and PLC control system; The water distribution well, flocculation sedimentation tank, sludge conditioning tank, thickening tank, balancing tank and dewatering system are arranged in sequence; The sludge equalization tank is equipped with a sludge mixture lift pump and an ultrasonic level gauge, both of which are connected to the PLC control system. The concentration tank is equipped with an online turbidity meter and an automatic cleaning and drainage sampling device, both of which are connected to the PLC control system. The balance tank is equipped with an MLSS instrument, an ultrasonic level gauge, and an electric butterfly valve for sludge inlet, all of which are connected to the PLC control system. The dewatering system is equipped with a centrifugal dewatering machine and a sludge feed screw pump, both of which are connected to the PLC control system. The PAM dosing system is equipped with a screw pump that is connected to the PLC control system and can automatically add PAM.

2. The automatic treatment and control system for sludge discharge from a waterworks according to claim 1, characterized in that, The sludge equalization tank is equipped with two sludge mixed liquor lift pumps and two ultrasonic level gauges. The concentration tank is equipped with one online turbidity meter and one automatic cleaning and drainage sampling device. The balance tank is equipped with one MLSS instrument, one ultrasonic level gauge and one electric butterfly valve for sludge inlet. The dewatering system is equipped with one centrifugal dewatering machine and two sludge feed screw pumps. The PAM dosing system is equipped with three screw pumps and one electromagnetic flowmeter.

3. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 2, characterized in that, The sludge solution in the sludge equalization tank comes from the solution generated by the automatic sludge discharge from the flocculation sedimentation tank; the sludge equalization tank is equipped with a sludge mixed liquor lift pump, which is used to lift the sludge solution to the thickening tank, and the start and stop control signal of the sludge mixed liquor lift pump is connected to the PLC control system.

4. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 3, characterized in that, The ultrasonic level gauge in the sludge equalization tank is connected to the PLC control system via a 4-20mA analog signal to monitor the liquid level in the sludge equalization tank in real time.

5. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 4, characterized in that, The online turbidity meter in the thickening tank is installed in the effluent channel of the thickening tank and is connected to the PLC control system through a 4-20mA analog signal to monitor the turbidity of the recycled water online. The sludge mixed liquor lift pump in the sludge conditioning tank is linked with the online turbidity meter in the thickening tank to realize dynamic adjustment of the sludge feed rate.

6. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 5, characterized in that, The MLSS instrument in the balancing tank is installed in the middle of the balancing tank, detects the sludge concentration and transmits it to the PLC control system through a 4-20mA analog signal.

7. The automatic treatment and control system for sludge discharge from a waterworks according to claim 6, characterized in that, The ultrasonic level gauge of the balance tank is located at the top of the balance tank and monitors the liquid level in real time. It is connected to the PLC control system as a 4-20mA analog signal. The electric butterfly valve for sludge inlet of the balance tank receives commands from the PLC control system to control its opening and closing, and provides real-time feedback to the PLC on the valve opening degree; the screw pump of the PAM dosing system is used for PAM dosing, and the start / stop control signal of the screw pump of the PAM dosing system is connected to the PLC control system; the electromagnetic flowmeter of the PAM dosing system is connected to the PLC control system through a 4-20mA analog signal to monitor the PAM dosing flow rate in real time.

8. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 2, characterized in that, The PLC control system integrates a power supply, CPU, AI / AO module, DI / DO module, data memory, and Ethernet communication module.

9. The automatic treatment and control system for sludge discharge water in a waterworks according to claim 8, characterized in that, It also includes a central control system, which uses InTouch host computer software and is deployed on the central control room server. It communicates with the PLC control system via TCP / IP protocol and integrates real-time data monitoring, alarm, and historical data storage functions. The main interface displays the real-time liquid level of the sludge equalization tank, the status of the sludge mixed liquor lift pump, the real-time turbidity of the thickener effluent, the real-time MLSS level of the balance tank, and the opening status of the sludge inlet electric butterfly valve.

10. An automatic treatment and control system for sludge discharge from a waterworks according to claim 1, wherein the automatic cleaning and drainage sampling device is installed in the overflow area of ​​the thickener weir and is used for online turbidity meter sampling of the supernatant of the thickener; the automatic cleaning and drainage sampling device consists of two square sampling boxes, namely a stabilizing zone (1) on the left and a detection zone (2) on the right; a nozzle (3) for connecting the self-use water pipe of the plant is provided at the top of the stabilizing zone (1); a float level switch (4) is provided in the middle of the stabilizing zone (1); a perforated baffle (5) is provided at the connection between the stabilizing zone (1) and the detection zone (2); a turbidity meter mounting bracket (6) and an outlet weir (7) are provided at the top of the detection zone (2); an empty pipe (8) is provided at the bottom of the detection zone (2); and a solenoid valve (9) is provided on the empty pipe (8); the area of ​​the stabilizing zone (1) is three times that of the detection zone (2); and the opening rate of the perforated baffle (5) is 50%, so that the water flow smoothly transitions into the detection zone; The bottom of both the stabilizing zone (1) and the detection zone (2) is designed with an inclination angle of ≥5° to make it easier to drain the sludge at the bottom. The inner wall is provided with rounded chamfers to prevent sludge from accumulating in dead corners.

Images