A constant pressure stabilizing treatment system for filtrate water recycling

Abstract

This application discloses a constant-pressure stabilizing treatment system for filtrate water recycling, including a dehydration and filtration device. The dehydration and filtration device is connected to an automatic turbidity diversion unit, which is connected to a sedimentation and recovery unit and a thickening tank. The sedimentation and recovery unit is connected to a backwash clear water tank, which is connected to a constant-pressure stabilizing water supply unit, which is connected to the dehydration and filtration device. The beneficial effects of this application include: significant water saving, stable pressure, strong filter plate protection, stable water quality, fully automatic operation, and outstanding environmental benefits.

Description

Technical Field

[0001] This application belongs to the technical field of mine solid-liquid separation water treatment, industrial wastewater recycling and water-saving equipment for ceramic filters. Specifically, it relates to a constant pressure stabilization system for filtrate water recycling and reuse. It is a closed-loop reuse system that can be used for filtrate collection, purification, constant pressure stabilization and automatic diversion of turbidity in backwash water of ceramic filters. Background Technology

[0002] Ceramic filters are widely used in the dewatering of concentrates and tailings in industries such as mining, metallurgy, and chemicals due to their high efficiency, energy saving, and environmental friendliness. Their core working component is the ceramic filter plate, which achieves solid-liquid separation through capillary action. In actual operation, to ensure the filter plate maintains good permeability over a long period, it is necessary to periodically clean the micropores of the filter plate using a backwashing process. The stability of the backwash water quality and pressure directly determines the service life of the filter plate and the overall dewatering efficiency of the machine.

[0003] Currently, conventional ceramic filtration systems in the industry typically discharge the filtrate directly into thickening tanks or tailings ponds, while simultaneously introducing fresh industrial water or clean water as a backwashing source. This "one-time use, direct discharge" model results in extremely high consumption of fresh water and serious waste of water resources, especially in water-scarce mining areas or regions with strict environmental protection requirements, where companies face enormous water costs and environmental pressures.

[0004] Meanwhile, existing systems generally lack multi-stage pressure stabilization design in their backwash water supply stages. Water supply is mostly directly connected to the workshop pipeline network, and the pressure fluctuates drastically due to the start and stop of other water usage points. Instantaneous high pressure can easily cause micropores of the filter plate to rupture or the filter plate itself to break, while excessively low pressure leads to insufficient backwashing force, aggravated filter plate clogging, and thus frequent filter plate replacements, significantly increasing operation and maintenance costs.

[0005] Furthermore, in actual production, fluctuations in feed concentration, changes in slurry particle size, or the condition of the filter itself can cause occasional "turbidity" in the filtrate, meaning a sharp increase in the concentration of suspended solids (SS) in the filtrate. Current technology lacks online monitoring and automatic diversion devices for filtrate quality. Once turbid water enters the circulation system, its fine particles quickly clog the micropores of the filter plates, causing irreversible damage and contaminating the entire backwash water circulation loop, potentially leading to system failure in severe cases.

[0006] To address the issues of direct discharge of filtrate and water quality, some companies have attempted to install filtrate collection tanks for natural sedimentation. However, traditional collection tanks have a simple structure, are prone to accumulating large amounts of sludge at the bottom, are difficult to clean, and lack corresponding purification processes. The suspended solids (SS) concentration in the supernatant after sedimentation remains as high as 50–100 mg / L, far below the SS ≤ 15 mg / L requirement for backwashing ceramic filters. Long-term use of substandard backwash water accelerates the clogging of filter plate micropores, forcing an increase in backwashing frequency, further exacerbating fresh water consumption and energy consumption.

[0007] Furthermore, the existing system suffers from low overall automation, with processes such as filtrate discharge, backwashing switching, and sludge removal from the water tank all relying on manual inspection and operation. When the filtrate becomes turbid or the water supply pressure is abnormal, it cannot respond in a timely manner, leading to the escalation of the malfunction, poor production continuity, and the need for dedicated operators, resulting in high labor costs.

[0008] In summary, existing ceramic filter backwashing systems suffer from a series of problems, including severe water waste, large fluctuations in water supply pressure, inability to automatically isolate turbid water, insufficient purification capacity, and low automation levels. These issues have become common technical bottlenecks in the industry, hindering the efficient and stable operation of the equipment. Therefore, developing a system that enables filtrate recycling, multi-stage pressure stabilization, online water quality monitoring and automatic purification, and intelligent control throughout the entire process has urgent market demand and significant engineering application value. Summary of the Invention

[0009] The purpose of this application is to provide a constant pressure stabilizing treatment system for filtrate recycling, which solves the following problems: 1. It solves the problems of direct discharge of filtrate from ceramic filters and high consumption of fresh water for backwashing; 2. It solves the problems of large fluctuations in backwash water pressure and inability to stabilize it within the rated range of 0.08 to 0.12 MPa; 3. It solves the problems of filtrate running turbid without diversion, turbid water contaminating the circulation system, and easy clogging of filter plates; 4. It solves the problems of poor filtrate purification effect and failure to meet suspended solids standards; 5. It achieves fully closed-loop automatic recycling of filtrate, zero wastewater discharge, and full recovery of mineral sludge.

[0010] The objective of this application is achieved through the following technical solution: A constant pressure stabilizing treatment system for filtrate water recycling includes a dehydration and filtration device, which is connected to an automatic turbidity diversion unit. The automatic turbidity diversion unit is connected to a sedimentation and recovery unit and a thickening tank, respectively. The sedimentation and recovery unit is connected to a backwash clear water tank, and the backwash clear water tank is connected to a constant pressure stabilizing water supply unit. The constant pressure stabilizing water supply unit is connected to the dehydration and filtration device.

[0011] Furthermore, the dehydration and filtration equipment is a ceramic filter.

[0012] Furthermore, the automatic turbidity diversion unit includes an online turbidity meter, a three-way valve, and a PLC control cabinet. The dewatering and filtration equipment is connected to the online turbidity meter, which is connected to the three-way valve. The three-way valve is connected to the sedimentation and recovery unit and the thickening tank, respectively. Both the online turbidity meter and the three-way valve are electrically connected to the PLC control cabinet.

[0013] Furthermore, the three-way valve is an electric three-way valve.

[0014] Furthermore, the sedimentation and recovery unit includes a filtrate collection tank, a clarification tank, and a precision filter. The automatic turbidity diversion unit is connected to the filtrate collection tank, the filtrate collection tank is connected to the clarification tank, the clarification tank is connected to the precision filter, and the precision filter is connected to the backwash water tank.

[0015] Furthermore, the filtrate collection tank is divided into an energy dissipation zone and a coarse settling zone along the flow direction. A lift pump is provided at the top of the coarse settling zone, and a sludge collection hopper is provided at the bottom of the coarse settling zone. A sewage pump is provided inside the sludge collection hopper.

[0016] Furthermore, the clarification tank is an inclined tube clarification tank, and the precision filter is a multi-media precision filter.

[0017] Furthermore, the pressure-stabilizing and constant-pressure water supply unit includes a variable frequency water supply pump set, a pressure-stabilizing and pressure-reducing main pipe, a pressure-regulating branch pipe, and a PLC control cabinet. The backwash clear water tank is connected to the variable frequency water supply pump set, the variable frequency water supply pump set is connected to the pressure-stabilizing and pressure-reducing main pipe, the pressure-stabilizing and pressure-reducing main pipe is equipped with a pressure-stabilizing and pressure-reducing valve, the pressure-stabilizing and pressure-reducing main pipe is connected to the pressure-regulating branch pipe, the pressure-regulating branch pipe is equipped with a pressure-regulating valve, the pressure-regulating branch pipe is connected to the dewatering and filtration equipment, and both the variable frequency water supply pump set and the pressure-regulating valve are electrically connected to the PLC control cabinet.

[0018] Furthermore, the pressure stabilizing and constant pressure water supply unit also includes a clear water tank level gauge, a main pipe pressure sensor, and a branch pipe pressure sensor, all of which are electrically connected to the PLC control cabinet.

[0019] Furthermore, the PLC control cabinet includes an audible and visual alarm.

[0020] The beneficial effects of this application are: 1. Significant water-saving effect: filtrate reuse rate ≥90%, and backwashing fresh water consumption reduced by more than 85%.

[0021] 2. Stable pressure: The backwash pressure remains constant within the rated range, with no impact or water hammer.

[0022] 3. Strong filter plate protection: 100% automatic diversion of runoff, reducing filter plate clogging frequency by more than 70%.

[0023] 4. Stable water quality: effluent SS ≤ 15 mg / L, meeting the stringent requirements of backwashing.

[0024] 5. Fully automatic operation: unattended, fault alarm, and data traceability.

[0025] 6. Outstanding environmental benefits: zero wastewater discharge and full recycling of mine sludge, meeting the standards for green mines.

[0026] The aforementioned main solution and its various further alternatives can be freely combined to form multiple solutions, all of which are solutions that can be adopted and claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding this solution, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the application process.

[0028] Figure 2 This is a schematic diagram of the control logic of the automatic diversion unit for turbidity in this application.

[0029] Figure 3 This is a schematic diagram of the control logic of the (Level 4) stabilizing and constant pressure water supply unit in this application.

[0030] In the diagram: 1-Dehydration and filtration equipment, 2-Online turbidity meter, 3-Three-way valve, 4-Filtrate collection tank, 5-Clarification tank, 6-Precision filter, 7-Backwash clear water tank, 8-Variable frequency water supply pump set, 9-Pressure stabilizing and reducing main pipe, 10-Pressure stabilizing and reducing valve, 11-Pressure regulating branch pipe, 12-Pressure regulating valve, 13-PLC control cabinet, 14-Thickening tank. Detailed Implementation

[0031] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0032] Example refer to Figure 1 As shown, a constant pressure stabilizing treatment system for filtrate water recycling includes a dewatering and filtration device 1, an automatic turbidity diversion unit, a sedimentation and recovery unit, a backwash clear water tank 7, a constant pressure stabilizing water supply unit, a PLC control cabinet 13, and a thickening tank 14.

[0033] The dehydration and filtration device 1 is the filtrate generation end. It is connected to the automatic turbidity diversion unit, which diverts the filtrate to this unit for further processing. The automatic turbidity diversion unit is connected to both the sedimentation and recovery unit and the thickening tank 14. It monitors the concentration of suspended solids (SS) in the filtrate. When the concentration exceeds a threshold, the filtrate is sent to the thickening tank 14; when the concentration falls below the threshold, the filtrate is sent to the sedimentation and recovery unit for further processing.

[0034] The sedimentation and recovery unit is connected to the backwash clear water tank 7. The sedimentation and recovery unit performs sedimentation separation and filtration recovery on the filtrate, so that the filtered clear water can be reused and sent to the clear water tank, while the settled sludge can be recycled. The backwash clear water tank 7 is used for the unified collection of new water and recycled water.

[0035] The backwash water tank 7 is connected to the constant pressure water supply unit, which is connected to the dehydration and filtration equipment 1. The constant pressure water supply unit draws clean water from the backwash water tank 7 and precisely adjusts the water volume and pressure to supply backwash water to the dehydration and filtration equipment 1 under stable pressure, thus avoiding damage to the equipment caused by fluctuations in water pressure.

[0036] The PLC control cabinet 13 is used to monitor and regulate the working status of the entire system. The PLC control cabinet 13 monitors the concentration of suspended solids in the turbidity diversion unit and regulates the diversion. The PLC control cabinet 13 also monitors and regulates the pressure and flow of the constant pressure water supply unit.

[0037] The dewatering and filtration equipment 1 is a ceramic filter, but other equipment can also be used. That is, this system can be used for water circulation treatment of ceramic filters used for solid-liquid separation in mines, and can also be applied to other related equipment with filtrate reuse treatment requirements.

[0038] The automatic turbidity diversion unit includes an online turbidity meter 2, a three-way valve 3, and a PLC control cabinet 13. The dewatering and filtration equipment 1 is connected to the online turbidity meter 2, which monitors the suspended solids in the filtrate in real time. The online turbidity meter 2 is also connected to the three-way valve 3, which is connected to both the sedimentation and recovery unit and the thickening tank 14. The three-way valve 3 is an electrically operated three-way valve, which determines the diversion direction of the filtrate.

[0039] Both the online turbidity meter 2 and the three-way valve 3 are electrically connected to the PLC control cabinet 13. The online turbidity meter 2 transmits the filtrate monitoring data to the PLC control cabinet 13. The PLC control cabinet 13 judges the data and determines the diversion direction of the three-way valve 3, whether to divert the filtrate to the sedimentation and recovery unit through the three-way valve 3 or to the thickening tank 14 through the three-way valve 3.

[0040] refer to Figure 2 As shown, the online turbidity meter and the electric three-way valve constitute an automatic turbidity diversion unit. It automatically switches the flow direction with a threshold of 50 NTU. When the concentration is less than 50 NTU, the filtrate enters the sedimentation and recovery unit; when the concentration is greater than 50 NTU, it enters the thickening tank 14. The automatic turbidity diversion unit has a response time of ≤3 seconds and automatically switches to the reflux position upon power failure, meaning the filtrate enters the thickening tank 14, ensuring that turbid water does not enter the circulation system.

[0041] The sedimentation and recovery unit includes a filtrate collection tank 4, a clarifier tank 5, and a precision filter 6. The three-way valve 3 of the automatic turbidity diversion unit is connected to the filtrate collection tank 4, which collects the filtrate and performs initial sedimentation. The filtrate collection tank 4 is connected to the clarifier tank 5, which in turn is connected to the precision filter 6. The precision filter 6 is connected to the backwash water tank 7. The clarifier tank 5 and the precision filter 6 perform secondary filtration of the filtrate, and the sludge is recovered through the clarifier tank 5. The resulting clean water is then sent to the water tank for reuse.

[0042] The filtrate collection tank 4 is divided into an energy dissipation zone and a coarse settling zone along the flow direction. The energy dissipation zone dissipates energy and slows down the incoming filtrate to avoid disturbing the normal settling process. The coarse settling zone achieves physical sedimentation and stratification of solids and liquids. A lift pump is installed at the top of the coarse settling zone to send the coarsely filtered water to the clarifier tank 5. A sludge collection hopper is installed at the bottom of the coarse settling zone, and a sludge discharge pump is installed in the sludge collection hopper to discharge the settled sludge.

[0043] Clarification tank 5 is an inclined tube clarifier, preferably using ethylene-propylene copolymer inclined tubes, to achieve filtrate filtration and sludge recovery. Precision filter 6 is a multi-media precision filter, using quartz sand and anthracite filter media to achieve precise filtration of the filtrate, ultimately obtaining clean water which is sent to the clear water tank for reuse.

[0044] The constant pressure water supply unit includes a variable frequency water supply pump set 8, a pressure stabilizing and reducing main pipe 9, pressure regulating branch pipes 11, and a PLC control cabinet 13. The backwash clear water tank 7 is connected to the variable frequency water supply pump set 8, which boosts the pressure of the clear water. The variable frequency water supply pump set 8 is connected to the pressure stabilizing and reducing main pipe 9, which in turn is connected to the pressure regulating branch pipes 11. The pressure regulating branch pipes 11 are connected to the dewatering and filtration equipment 1. The pressure stabilizing and reducing main pipe 9 provides unified delivery of clear water, while the several pressure regulating branch pipes 11 distribute the clear water. A pressure regulating branch pipe 11 is arranged for each dewatering and filtration equipment 1 to achieve independent water supply, ensuring that the equipment does not interfere with each other.

[0045] The variable frequency water supply pump set 8 achieves constant pressure supply of clean water through its own frequency conversion, which is the first stage of pressure stabilization. A pressure stabilizing and reducing valve 10 is installed on the main pressure stabilizing and reducing pipe 9. This valve utilizes outlet pressure feedback and automatically balances with the regulating spring force to dynamically control the valve core opening, stabilizing the inlet high pressure to the set outlet low pressure, which is the second stage of pressure stabilization. A pressure regulating valve 12 is installed on the pressure regulating branch pipe 11. This valve 12 is a pneumatic diaphragm regulating valve. Through control signal air pressure, it drives diaphragm deformation, causing valve core displacement and changing the flow area between the valve core and valve seat, thereby precisely regulating parameters such as medium flow rate and pressure, which is the third stage of pressure stabilization.

[0046] The constant pressure water supply unit also includes a clear water tank level gauge, a main pipe pressure sensor, and a branch pipe pressure sensor. The clear water tank level gauge is used to monitor the water level in the backwash clear water tank 7. The main pipe pressure sensor is used to monitor the water pressure on the pressure stabilizing and reducing main pipe 9. The branch pipe pressure sensor is used to monitor the water pressure on the pressure regulating branch pipe 11. The clear water tank level gauge, the main pipe pressure sensor, and the branch pipe pressure sensor are all electrically connected to the PLC control cabinet 13. The variable frequency water supply pump group 8 and the pressure regulating valve 12 are both electrically connected to the PLC control cabinet 13. The PLC control cabinet 13 includes an audible and visual alarm.

[0047] PLC control cabinet 13 serves as the control core, forming an intelligent control system with a touch screen, pressure sensors, pressure transmitters, and audible and visual alarms. It collects real-time signals such as main pipe pressure, branch pipe pressure, clear water tank level, and pump operating status, comparing them with the set pressure value to achieve automatic adjustment. When the pressure is too high, it reduces the pump frequency or closes the regulating valve opening; when the pressure is too low, it increases the frequency or opens the valve wider. If the pressure continues to exceed the limit, an audible and visual alarm is triggered to alert maintenance personnel. It is a four-level pressure stabilization system. (Reference) Figure 3 As shown, the variable frequency constant pressure pump group, the main pipe pressure stabilizing and reducing valve, the branch pipe pressure regulating valve, and the PLC control cabinet closed-loop control constitute a four-level constant pressure stabilization system, which stabilizes the backwash pressure at 0.08 to 0.12 MPa.

[0048] The system purifies the effluent with SS ≤ 15 mg / L, maintains a backwash pressure of 0.08–0.12 MPa, achieves a filtrate reuse rate ≥ 90%, and reduces fresh water consumption by more than 85%.

[0049] Example 2 refer to Figures 1-3 As shown, a constant-pressure stabilizing system for filtrate water recycling is an extended implementation based on Example 1. This example uses 6 JDTC units. The following is a detailed explanation using the 60-type ceramic filter system as an example.

[0050] System components: Filtrate collection tank: effective volume ≥ 80m³, bottom slope 5‰, equipped with a conical sludge hopper, lift pump, sewage pump, and level gauge; Inclined tube clarifier: dimensions 5.5m × 3.2m × 3.2m, water retention time 40min, equipped with ethylene-propylene copolymer inclined tubes; Multi-media precision filter: 2 GLQ units Type 90, one in operation and one on standby, quartz sand + anthracite filter media, effluent SS ≤ 15 mg / L; filtrate booster pumps: 2 ISG80 units 50 200, flow rate 90m³ / h, one in use and one on standby.

[0051] Four-stage voltage stabilization system: Variable frequency pump set: 3 CDLF85 units 10 vertical multistage pumps, two in operation and one on standby; main pipe pressure reducing valve: Y42X 16C, DN150; Branch pipe pressure regulating valve: ZJHP 16 pneumatic control valves, one per filter, totaling 6; PLC + pressure transmitter + touch screen + audible and visual alarm; turbidity diversion system: TUR 2000 Online Turbidity Meter + D941X 16-way electric three-way valve, threshold 50 NTU; backwash water tank: made of 304 stainless steel, effective volume 47.25 m³, automatic replenishment of fresh water when the liquid level is low.

[0052] Connection sequence: Ceramic filter filtrate outlet → mains pipe → turbidity monitoring point → three-way valve → filtrate collection tank → booster pump → inclined tube clarifier → multi-media filter → clear water tank → variable frequency pressure stabilizing pump set → pressure reducing valve → branch pipe regulating valve → backwash inlet of each filter. When turbidity exceeds the standard, the three-way valve directly switches to the thickener return pipe.

[0053] Workflow: Normal operation: Filtrate is collected → settled → filtered through precision → supplied with constant pressure water → backwashed and reused. Turbidity operation: When turbidity > 50 NTU, the valve switches within 3 seconds, and the turbid water is directly discharged into the thickening tank without entering the circulation. Pressure stabilization control: The PLC adjusts the frequency and valve opening in real time, maintaining a constant pressure of 0.08–0.12 MPa. Sludge treatment: Sludge from the collection tank and clarifier is recovered to the production system via a sludge hopper.

[0054] Control logic: Pressure over-limit → alarm + automatic adjustment; Turbidity over-limit → diversion + alarm; Power failure → three-way valve automatically switches to the return position to protect the system; Supports automatic / manual dual modes.

[0055] The foregoing basic examples and their further alternative examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed in this application. In the scheme of this application, each alternative example can be arbitrarily combined with any other basic example and alternative example.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A constant pressure stabilizing treatment system for filtrate recycling, comprising a dehydration and filtration device (1), characterized in that: The dewatering and filtration equipment (1) is connected to the automatic turbidity diversion unit, which is connected to the sedimentation and recovery unit and the thickening tank (14) respectively. The sedimentation and recovery unit is connected to the backwash clear water tank (7), which is connected to the pressure stabilizing and constant pressure water supply unit, which is connected to the dewatering and filtration equipment (1).

2. The filtrate water recycling and constant pressure stabilization system according to claim 1, characterized in that: The dehydration and filtration equipment (1) is a ceramic filter.

3. The filtrate water recycling and constant pressure stabilization system according to claim 1, characterized in that: The automatic turbidity diversion unit includes an online turbidity meter (2), a three-way valve (3), and a PLC control cabinet (13). The dewatering and filtration equipment (1) is connected to the online turbidity meter (2), the online turbidity meter (2) is connected to the three-way valve (3), the three-way valve (3) is connected to the sedimentation and recovery unit and the thickening tank (14) respectively, and the online turbidity meter (2) and the three-way valve (3) are both electrically connected to the PLC control cabinet (13).

4. The filtrate water recycling and constant pressure stabilization system according to claim 3, characterized in that: The three-way valve (3) is an electric three-way valve.

5. The filtrate water recycling and constant pressure stabilization system according to claim 1, characterized in that: The sedimentation and recovery unit includes a filtrate collection tank (4), a clarifier (5), and a precision filter (6). The automatic turbidity diversion unit is connected to the filtrate collection tank (4), the filtrate collection tank (4) is connected to the clarifier (5), the clarifier (5) is connected to the precision filter (6), and the precision filter (6) is connected to the backwash water tank (7).

6. The filtrate water recycling and constant pressure stabilization system according to claim 5, characterized in that: The filtrate collection tank (4) is divided into an energy dissipation zone and a coarse sedimentation zone along the flow direction. A lifting pump is provided at the top of the coarse sedimentation zone, and a sludge collection hopper is provided at the bottom of the coarse sedimentation zone. A sewage pump is provided in the sludge collection hopper.

7. The filtrate water recycling and constant pressure stabilization system according to claim 5 or 6, characterized in that: The clarifier (5) is an inclined tube clarifier, and the precision filter (6) is a multi-media precision filter.

8. The filtrate water recycling and constant pressure stabilization system according to claim 1, characterized in that: The pressure-stabilizing and constant-pressure water supply unit includes a variable frequency water supply pump group (8), a pressure-stabilizing and pressure-reducing main pipe (9), a pressure-regulating branch pipe (11), and a PLC control cabinet (13). The backwash clear water tank (7) is connected to the variable frequency water supply pump group (8), the variable frequency water supply pump group (8) is connected to the pressure-stabilizing and pressure-reducing main pipe (9), the pressure-stabilizing and pressure-reducing main pipe (9) is equipped with a pressure-stabilizing and pressure-reducing valve (10), the pressure-stabilizing and pressure-reducing main pipe (9) is connected to the pressure-regulating branch pipe (11), the pressure-regulating branch pipe (11) is equipped with a pressure-regulating valve (12), the pressure-regulating branch pipe (11) is connected to the dewatering and filtration equipment (1), and the variable frequency water supply pump group (8) and the pressure-regulating valve (12) are both electrically connected to the PLC control cabinet (13).

9. The filtrate water recycling and constant pressure stabilization system according to claim 8, characterized in that: The pressure stabilizing and constant pressure water supply unit also includes a clear water tank level gauge, a main pipe pressure sensor, and a branch pipe pressure sensor. The clear water tank level gauge, the main pipe pressure sensor, and the branch pipe pressure sensor are all electrically connected to the PLC control cabinet (13).

10. The filtrate water recycling and constant pressure stabilization system according to claim 3 or 8, characterized in that: The PLC control cabinet (13) includes an audible and visual alarm.

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