Combined sewage sludge treatment device

Abstract

This invention discloses a combined wastewater and sludge treatment device, relating to the field of wastewater and sludge treatment technology. It includes a belt filter press, a filter belt, a detection belt, and a metal sheet wrapped within the detection belt. It also includes a sealed differential pressure detection chamber, which forms a closed detection cavity to detect the pressure difference across the filter belt in real time. A detection port is provided for detecting the metal sheet. The sealed differential pressure detection chamber includes a mounting frame, an elastic seal, a spring-loaded floating support, and a cleaning unit. It also includes a re-selection filter tank located below the cleaning unit. The differential pressure detection unit, located within the mounting frame, detects the pressure difference and controls the cleaning unit to adjust the cleaning mode. This invention enables proactive filter belt cleaning, accurately detects abnormal states such as filter belt damage and breakage, significantly improves the reliability of filter belt damage detection, extends the filter belt's service life, improves differential pressure detection accuracy, saves water resources, and significantly reduces equipment operating costs.

Description

Technical Field

[0001] This invention relates to the field of wastewater and sludge treatment technology, and in particular to a combined wastewater and sludge treatment device. Background Technology

[0002] Belt filter presses are among the most widely used solid-liquid separation devices in the field of wastewater and sludge treatment. They dewater and dry sludge through the pressing action of the filter belt, offering advantages such as large processing capacity, continuous operation, and simple operation. The working process of a belt filter press typically includes three stages: gravity dewatering, wedge pressing, and roller pressing dewatering. The sludge is driven by the filter belt through these areas in sequence. After solid-liquid separation, the dewatered sludge cake is discharged, and the filtrate is collected, discharged, or reused.

[0003] Existing belt filter presses are prone to damage to their filter belts due to wear, tearing, and aging during long-term operation. Current methods rely mainly on manual inspection or single-sensor detection, which can easily lead to large-scale sludge leakage due to delayed detection. Single-sensor detection is also prone to false alarms or missed detections due to sludge adhesion and poor contact, and cannot differentiate the degree of damage, only triggering a simple shutdown, severely impacting the continuous operating efficiency of the equipment. The edges of the filter belt are the most easily worn parts. Traditional seals are in direct contact with the filter belt surface, and long-term sliding friction causes rapid wear of the filter belt edges, significantly shortening the filter belt's lifespan and increasing equipment maintenance costs. Existing filter belt cleaning methods mostly use timed cleaning modes, which cannot adjust the cleaning frequency and intensity according to the actual degree of filter belt blockage. This easily leads to water waste and may result in incomplete cleaning when the filter belt is severely blocked, affecting filtration performance and treatment efficiency. Existing gravity dewatering zones mostly use an integrated filtrate collection structure, where filtrate from all stages is collected and treated uniformly. However, the filtrate quality varies significantly at different stages of gravity dehydration. The filtrate from the first stage has low suspended solids content and can be reused directly, while the filtrate from the second stage requires deep treatment. The mixed collection method leads to the waste of high-quality filtrate and increases the load and operating costs of subsequent treatment. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention adopts the following technical solution:

[0005] A combined wastewater and sludge treatment device includes a belt filter press and a filter belt mounted on the belt filter press, and further includes:

[0006] A detection strip is provided along the edge of the filter strip, and the detection strip is made of a fold-resistant rubber material;

[0007] A metal sheet is wrapped inside the detection strip. When the metal sheet breaks, the signal is cut off to trigger a shutdown and maintenance command.

[0008] A sealed differential pressure detection box is installed at the detection station of the belt filter press. A closed detection chamber is formed inside the sealed differential pressure detection box to detect the pressure difference on both sides of the filter belt in real time.

[0009] The detection port is located on the side of the sealed differential pressure detection box, with a power supply head and a detection head respectively located at the upper and lower ends near the detection belt.

[0010] The differential pressure testing chamber includes:

[0011] The mounting frame is installed on the belt filter press;

[0012] Two sets of elastic seals are provided and located at both ends of the filter belt, respectively, to form a closed area between the filter belt and the mounting frame to detect pressure difference;

[0013] The spring floating frame has two sets and is fixedly installed at the upper and lower ends of the mounting frame. The elastic seal elastically abuts against the filter belt through the spring floating frame and applies pressure to the filter belt.

[0014] A cleaning unit is disposed on the side of the mounting frame, and its length direction is consistent with the width direction of the filter belt;

[0015] The re-selection filter is located below the cleaning unit;

[0016] A differential pressure detection unit is installed within the mounting frame to detect pressure differences and control the cleaning unit to adjust the cleaning mode.

[0017] Preferably, there are two metal plates that do not intersect each other. When the signal of one metal plate is cut off, an alarm is triggered. When the signals of both metal plates are cut off, a shutdown and maintenance command is triggered.

[0018] Preferably, the outer edge of the metal sheet penetrates the detection strip and extends outward, the power supply head abuts and adheres to the extended end of the metal sheet to provide power, and the detection head abuts and adheres to the extended end of the metal sheet to collect the electrical signal of the metal sheet.

[0019] Preferably, the detection port is further provided with a brush head for cleaning the extension of the metal sheet.

[0020] Preferably, the elastic seal includes a sealing strip and a rubber sealing roller; the sealing strip is arranged along a side parallel to the running direction of the filter belt, and the sealing strip slides in cooperation with the detection belt; the rubber sealing roller is arranged along a side perpendicular to the running direction of the filter belt, and the rotational linear velocity of the rubber sealing roller is consistent with the running speed of the filter belt to achieve follow-up sealing, and the rubber sealing roller is driven to rotate by a servo motor mounted on the spring floating frame.

[0021] Preferably, the detection strip is provided with a low-friction slide for the sealing strip to slide.

[0022] Preferably, the shaft end of the rubber sealing roller passes through the sealing strip, and a supplementary sealing strip is provided at the junction of the shaft end of the rubber sealing roller and the sealing strip. A disc spring and a retaining ring are provided between the supplementary sealing strip and the spring floating frame. The disc spring is disposed between the retaining ring and the spring floating frame, and the retaining ring is in contact with the supplementary sealing strip.

[0023] Preferably, the upper end of the rubber sealing roller is provided with an elastic abutment plate, which elastically abuts against the upper surface of the rubber sealing roller to prevent leakage between the upper end of the rubber sealing roller and the wall of the detection box.

[0024] Preferably, the gravity dewatering zone of the belt filter press includes multiple independent collection chambers arranged sequentially along the running direction of the filter belt.

[0025] Preferably, the reprocessing filter includes an inclined plate sedimentation separation tank, which is connected to the collection chamber and is used to perform gravity sedimentation separation on the collected filtrate to remove suspended solid particles from the filtrate; an overflow weir, located at the outlet end of the inclined plate sedimentation separation tank, is used to control the liquid level of the filtrate and to achieve stratified overflow separation of the clear liquid and the concentrated liquid; and a screw conveyor, located at the bottom of the inclined plate sedimentation separation tank, is used to continuously transport the sedimented and concentrated sludge to the sludge collection end.

[0026] The present invention has the following beneficial effects:

[0027] 1. This invention features a detection strip made of foldable rubber material at the edge of the filter belt. This strip possesses excellent tensile and fracture-resistant properties, allowing the filter belt to withstand repeated bending without cracking. It also serves as a wear-resistant protective layer for the filter belt edge, preventing direct contact and wear between the filter belt edge and the sealing components. Furthermore, by incorporating two non-intersecting metal detection strips at the filter belt edge, a dual-path graded detection system is constructed: a single metal strip breakage triggers a level one alarm, allowing the equipment to continue operating and remaining in a pre-warning monitoring state; a double metal strip breakage triggers a level two shutdown command. This mechanism effectively solves the problem of false shutdowns or missed detections caused by a single alarm threshold, balancing continuous operation efficiency and safety protection. Simultaneously, a brush head located beside the detection end continuously removes sludge adhering to the extended end of the metal strips, ensuring good electrical contact between the power supply head, detection head, and the metal strips, further reducing the false alarm rate.

[0028] 2. The differential pressure detection box of this invention achieves a non-slip, follow-up seal through sealing strips and rubber sealing rollers, protecting the filter belt during operation and extending its service life. Simultaneously, a multi-layered sealing system is formed by supplementary sealing strips, disc springs, and an upper elastic clamping plate, effectively sealing all possible leakage points and ensuring the airtightness of the sealed detection chamber. The elastic clamping force provided by the spring floating frame allows the filter belt to float up and down within a certain range, avoiding damage to the filter belt from rigid contact. This invention uses the differential pressure detection box to detect the pressure difference across the filter belt in real time, accurately determining the degree of filter belt blockage. When the pressure difference exceeds a preset threshold, the control system automatically starts the cleaning unit or adjusts the cleaning mode, achieving proactive responsive cleaning based on the actual blockage state. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of a belt filter press, which is a combined sewage and sludge treatment device.

[0030] Figure 2 This is a three-dimensional structural diagram of a combined sewage and sludge treatment device, including a sealed differential pressure detection box, filter belt, inclined plate sedimentation separation tank, and collection chamber.

[0031] Figure 3 This is a three-dimensional structural diagram of a sealed differential pressure detection box, filter belt, and inclined plate sedimentation separation tank in a combined sewage and sludge treatment device.

[0032] Figure 4 A three-dimensional structure of a sealed differential pressure detection box in a combined sewage and sludge treatment device. Figure 1 ;

[0033] Figure 5 This is a three-dimensional structural diagram of an elastic sealing element in a combined sewage and sludge treatment device;

[0034] Figure 6 A three-dimensional structure of a sealed differential pressure detection box in a combined sewage and sludge treatment device. Figure 2 ;

[0035] Figure 7 This is a partial structural side view of an elastic seal in a combined sewage and sludge treatment device;

[0036] Figure 8 This is a three-dimensional structural diagram of the detection port in a combined sewage and sludge treatment device;

[0037] Figure 9 yes Figure 3 Enlarged view of point A in the middle;

[0038] Figure 10 This is a cross-sectional view of the detection belt and the sealed differential pressure detection box in a combined sewage and sludge treatment device.

[0039] In the diagram: 1. Belt filter press; 2. Filter belt; 3. Detection belt; 4. Metal sheet; 5. Sealing differential pressure detection box; 6. Detection port; 7. Power supply head; 8. Detection head; 9. Mounting frame; 10. Elastic seal; 11. Spring floating frame; 12. Cleaning unit; 13. Recycle filter tank; 14. Brush head; 15. Sealing strip; 16. Rubber sealing roller; 18. Servo motor; 19. Low friction slide; 20. Replenishment seal; 21. Disc spring; 22. Anchoring ring; 23. Elastic anchoring plate; 24. Collection chamber; 25. Inclined plate settling separation tank; 26. Overflow weir; 27. Screw conveyor. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Reference Figures 1-10 A combined wastewater and sludge treatment device includes a belt filter press 1 and a filter belt 2 mounted on the belt filter press 1. It further includes: a detection belt 3 along the edge of the filter belt 2, the detection belt 3 being made of a fold-resistant rubber material; a metal sheet 4, wrapped inside the detection belt 3, which cuts off the signal when the metal sheet 4 breaks, triggering a shutdown and maintenance command; a sealed differential pressure detection box 5, located at the detection station of the belt filter press 1, forming a closed detection chamber to detect the pressure difference across the filter belt 2 in real time; and detection ports 6 located beside the sealed differential pressure detection box 5, with a power supply head 7 and a detection head 8 respectively located at the upper and lower ends near the detection belt 3. The sealed differential pressure detection box 5 includes: a mounting frame. 9. Installed on the belt filter press 1; 10. Two sets of elastic seals 10 are provided and located at both ends of the filter belt 2, used to form a closed area between the filter belt 2 and the mounting frame 9 to detect the pressure difference; 11. Two sets of spring floating frames 11 are provided and fixedly installed at the upper and lower ends inside the mounting frame 9. The elastic seals 10 elastically abut against the filter belt 2 through the spring floating frames 11 and apply pressure to the filter belt 2; 12. The cleaning unit is located beside the mounting frame 9, and its length direction is consistent with the width direction of the filter belt 2; 13. The back-selection filter tank 13 is located below the cleaning unit 12; 14. The differential pressure detection unit is located inside the mounting frame 9 to detect the pressure difference and control the cleaning unit 12 to adjust the cleaning mode.

[0042] The sludge is evenly distributed on the upper surface of the filter belt 2 through the feed inlet. It passes through the gravity dewatering zone, the wedge pressing zone and the roller pressing dewatering zone in sequence with the filter belt 2. After solid-liquid separation is completed, the dewatered sludge cake is discharged and the filtrate is collected and discharged or reused.

[0043] The detection belt 3 is made of fold-resistant rubber material, possessing tensile and breakage resistance, and can be repeatedly bent around the roller with the filter belt 2 without cracking. The detection belt 3 also protects the edges of the filter belt 2 and prevents edge wear. The metal sheet 4 continuously transmits electrical signals during normal operation; when the filter belt 2 breaks and causes the detection belt 3 to tear simultaneously, the metal sheet 4 breaks accordingly, cutting off the signal. Upon receiving the signal interruption command, the control system triggers a shutdown and maintenance action, promptly protecting equipment and personnel safety. The power supply head 7 is in contact with the extended end of the metal sheet 4 to provide continuous power, and the detection head 8 is in contact with the extended end of the metal sheet 4 to collect the electrical signal status of the metal sheet 4 in real time.

[0044] A closed detection chamber is formed inside the sealed differential pressure detection box 5. Elastic seals 10 seal the upper and lower parts of the filter belt 2 to detect the pressure difference between the two sides of the filter belt 2 in real time, thereby determining the degree of blockage in the pores of the filter belt 2. The elastic seals 10 form a closed area between the filter belt 2 and the mounting frame 9, working in conjunction with the differential pressure detection unit to detect the pressure difference between the two sides of the filter belt 2. The elastic seals 10 elastically abut against the filter belt 2 via a spring-loaded floating frame 11. The spring-loaded floating frame 11 provides continuous elastic clamping force between the elastic seals 10 and the filter belt 2, ensuring a reliable seal while allowing the filter belt 2 to float up and down within a certain range, avoiding damage to the filter belt 2 due to rigid contact. The cleaning unit 12 performs high-pressure spray cleaning on the filter belt 2 after it has passed through the detection station, restoring the filtration performance of the filter belt 2's pores. The recycling filter tank 13 collects cleaning waste liquid and filtrate, and further sorts and processes them for reuse. The differential pressure detection unit detects the pressure difference value in the closed detection chamber in real time and transmits the differential pressure signal to the control system. When the differential pressure exceeds the preset threshold, the control system controls the cleaning unit 12 to start or adjust the cleaning mode, so as to realize the active response cleaning management of the filter belt 2 blockage state.

[0045] There are two metal plates 4 that do not intersect each other. When the signal of one of the metal plates 4 is cut off, an alarm is triggered. When the signals of both metal plates 4 are cut off, a shutdown and maintenance command is triggered.

[0046] Two metal strips 4 are wrapped side-by-side within the detection belt 3 along its length, maintaining an insulating distance to prevent interference. When the filter belt 2 experiences minor damage or partial tearing, only the first metal strip 4 breaks, cutting off its signal circuit. Upon receiving this single-channel signal interruption, the control system triggers a level one alarm, alerting operators to the status of the filter belt 2. The equipment can continue operating but is under early warning monitoring; operators should arrange maintenance as soon as possible. If the damage to the filter belt 2 worsens, the second metal strip 4 also breaks, cutting off both signals. Upon receiving this dual-channel signal interruption, the control system triggers a level two shutdown and maintenance command, immediately stopping the equipment to prevent sludge leakage or further equipment malfunction due to severe damage to the filter belt 2. This bimetallic strip 4 graded alarm structure achieves gradient detection and graded response to the filter belt 2 damage status, effectively avoiding false shutdowns or missed detections caused by a single alarm threshold, thus improving the reliability and intelligence of the equipment.

[0047] The outer edge of the metal sheet 4 penetrates the detection strip 3 and extends outward. The power supply head 7 abuts against the extended end of the metal sheet 4 to provide power. The detection head 8 abuts against the extended end of the metal sheet 4 to collect the electrical signal of the metal sheet 4.

[0048] The power supply head 7 at detection port 6 is in contact with the extended end of the metal sheet 4. The power supply head 7 continuously supplies power to the metal sheet 4 through an external power source, maintaining the normal energization of the signal circuit of the metal sheet 4. The detection head 8 is in contact with the extended end of the metal sheet 4, acquiring the electrical signal of the metal sheet 4 in real time. When the metal sheet 4 is intact, the detection head 8 continuously receives a stable electrical signal; when the metal sheet 4 breaks, the detection head 8 detects a signal interruption and transmits the interruption signal to the control system, triggering the corresponding alarm or shutdown command. Both the power supply head 7 and the detection head 8 are mounted on the detection port 6 through an elastic clamping mechanism to ensure that they maintain a stable contact pressure with the extended end of the metal sheet 4 that moves with the filter belt 2, preventing false alarms caused by poor contact due to vibration or misalignment of the filter belt 2.

[0049] The detection port 6 is also equipped with a brush head 14 for cleaning the extension of the metal sheet 4.

[0050] During the operation of the belt filter press 1, solid particles in the sludge and wastewater may adhere to the surface of the extended end of the metal sheet 4 as the filter belt 2 moves, forming a sludge adhesion layer. This increases the electrical contact resistance between the power supply head 7 and the detection head 8 and the extended end of the metal sheet 4, affecting the accuracy of signal transmission and even causing false alarms. The brush head 14 continuously brushes the extended end of the metal sheet 4 as the filter belt 2 moves, removing the sludge and solid particles adhering to the surface of the extended end, maintaining its cleanliness, and ensuring good electrical contact between the power supply head 7 and the detection head 8 and the extended end of the metal sheet 4, thus improving the stability and reliability of the detection signal. The brush head 14 can be made of corrosion-resistant nylon bristles or stainless steel wire bristles and is mounted on the detection port 6 via an elastic bracket, allowing the bristle tips to continuously adhere to the surface of the extended end of the metal sheet 4 with appropriate pressure, balancing cleaning effectiveness with protection of the extended end surface.

[0051] The elastic seal 10 includes a sealing strip 15 and a rubber sealing roller 16; the sealing strip 15 is arranged along the side parallel to the running direction of the filter belt 2, and the sealing strip 15 slides in cooperation with the detection belt 3; the rubber sealing roller 16 is arranged along the side perpendicular to the running direction of the filter belt 2, and the rotational linear speed of the rubber sealing roller 16 is consistent with the running speed of the filter belt 2 to achieve follow-up sealing, and the rubber sealing roller 16 is driven to rotate by a servo motor 18 mounted on the spring floating frame 11.

[0052] The sealing strip 15 is arranged parallel to the running direction of the filter belt 2, meaning it is located at both edges of the closed detection chamber along the running direction of the filter belt 2. The sealing strip 15 slides with the detection belt 3, achieving dynamic sealing through the low-friction surface of the detection belt 3, preventing the sealing strip 15 from directly contacting the surface of the filter belt 2 and causing wear. The rubber sealing roller 16 is arranged perpendicular to the running direction of the filter belt 2, meaning it is located at both ends of the closed detection chamber along the width of the filter belt 2. The rotational linear speed of the rubber sealing roller 16 is consistent with the running speed of the filter belt 2, achieving dynamic sealing and eliminating relative sliding friction between the rubber sealing roller 16 and the filter belt 2, avoiding scratch damage to the surface of the filter belt 2, and ensuring the sealing reliability of the closed detection chamber. The rubber sealing roller 16 is driven to rotate by a servo motor 18 mounted on the spring floating frame 11. The rotational speed of the servo motor 18 is precisely controlled by the control system according to the real-time running speed signal of the filter belt 2, ensuring that the linear speed of the rubber sealing roller 16 is synchronized with the running speed of the filter belt 2 in real time.

[0053] The detection belt 3 is provided with a low-friction slide 19 for the sealing strip 15 to slide.

[0054] The sealing strip 15 slides in conjunction with the low-friction slide rail 19. This significantly reduces the sliding friction resistance between the sealing strip 15 and the detection belt 3, minimizing wear on both and extending their service life. Furthermore, it prevents the sealing strip 15 from directly contacting and damaging the filter belt 2 body, thus protecting the filtration accuracy and structural integrity of the filter belt 2. This is to prevent the sealing strip 15 from directly contacting and damaging the surface of the filter belt 2.

[0055] The shaft end of the rubber sealing roller 16 passes through the sealing strip 15. A supplementary seal 20 is provided at the junction of the shaft end of the rubber sealing roller 16 and the sealing strip 15. A disc spring 21 and a retaining ring 22 are provided between the supplementary seal 20 and the spring floating frame 11. The disc spring 21 is located between the retaining ring 22 and the spring floating frame 11. The retaining ring 22 is in contact with the supplementary seal 20.

[0056] A supplementary seal 20 is provided at the junction of the shaft end of the rubber sealing roller 16 and the sealing strip 15 to compensate for the structural gap between the shaft end of the rubber sealing roller 16 and the sealing strip 15, preventing gas or liquid in the sealed detection chamber from leaking out from this junction. A disc spring 21 and a retaining ring 22 are provided between the supplementary seal 20 and the spring floating frame 11. The disc spring 21 is located between the retaining ring 22 and the spring floating frame 11. The disc spring 21 continuously applies an elastic clamping force to the retaining ring 22 in the axial direction. The retaining ring 22 fits against the supplementary seal 20, transmitting the elastic clamping force of the disc spring 21 to the supplementary seal 20, so that the supplementary seal 20 is always tightly pressed against the junction of the shaft end of the rubber sealing roller 16 and the sealing strip 15, achieving reliable sealing to compensate for any leakage at this junction. The elastic compensation characteristics of the disc spring 21 allow the supplementary seal 20 to adapt to the slight displacement caused by vibration, thermal expansion, and other factors during the operation of the shaft end of the rubber sealing roller 16, maintaining the continuous effectiveness of the supplementary seal.

[0057] The upper end of the rubber sealing roller 16 is provided with an elastic abutment plate 23, which elastically abuts against the upper surface of the sealing roller to prevent leakage between the upper end of the rubber sealing roller 16 and the wall of the detection box.

[0058] The elastic clamping plate 23, under the action of elastic force, continuously adheres to the upper surface of the rubber sealing roller 16, effectively sealing any gaps between the upper end of the rubber sealing roller 16 and the test chamber wall caused by machining tolerances, assembly clearances, or operational vibrations. This prevents the test medium within the sealed test chamber from leaking from the upper end of the rubber sealing roller 16, ensuring the accuracy of the differential pressure test data. The elastic clamping plate 23 can be made of materials such as wear-resistant rubber sheet, polyurethane elastic sheet, or elastic metal sheet. Its elastic deformation can accommodate the radial runout of the rubber sealing roller 16 during operation, maintaining a continuous and effective upper seal.

[0059] The gravity dewatering zone of the belt filter press 1 includes multiple independent collection chambers 24 arranged sequentially along the running direction of the filter belt 2.

[0060] Along the direction of the filter belt 2, the gravity dewatering zone from the sludge feed end to the wedge-shaped inlet is divided into several independent collection chambers 24. For example, three to six chambers can be set, and the specific number can be adjusted according to the actual sludge properties and treatment volume. In the early section of the gravity dewatering zone, the sludge has a high water content, the filtrate production is large, and the suspended solids content in the filtrate is relatively low, resulting in clearer water. As the sludge moves forward along the filter belt 2, the water content gradually decreases, and the filtrate production decreases. However, due to the formation of sludge cake, the amount of fine sludge particles carried in the filtrate may change. Each independent collection chamber 24 collects the filtrate of its corresponding section, realizing the graded and independent collection of filtrate with different water quality characteristics, providing a basis for subsequent targeted reuse treatment. The filtrate from the better-quality early chambers can be reused directly or after simple treatment, while the filtrate from the poorer-quality later chambers is sent to the re-selection filter 13 for deep treatment, thereby reducing the overall treatment volume and lowering operating energy consumption. Each chamber collects filtrate from different dehydration stages and sorts it by quality based on the suspended solids concentration or turbidity of the filtrate in each chamber. High-quality filtrate is reused for cleaning nozzles or process water, while low-quality filtrate is returned to the feed end for reprocessing.

[0061] The backfill filter 13 includes an inclined plate sedimentation separation tank 25, which is connected to the collection chamber 24 and is used to perform gravity sedimentation separation on the collected filtrate to remove suspended solid particles from the filtrate; an overflow weir 26, located at the outlet end of the inclined plate sedimentation separation tank 25, is used to control the liquid level of the filtrate and realize the stratified overflow separation of the clear liquid and the concentrated liquid; and a screw conveyor 27, located at the bottom of the inclined plate sedimentation separation tank 25, is used to continuously transport the sedimented and concentrated sludge to the sludge collection end.

[0062] The inclined plate settling separator 25 and screw conveyor 27 are used for rapid removal of suspended solids, while the supernatant flows upward to the overflow weir 26. After reaching the height of the weir top, the supernatant overflows over the overflow weir 26, achieving stratified overflow separation of the clear liquid and the concentrate. The clear liquid that overflows the overflow weir 26 has better water quality and can be directly reused in the filter belt 2 cleaning unit 12 of the belt filter press 1 as cleaning water, thereby reducing the consumption of fresh water and lowering operating costs.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A combined sewage and sludge treatment device, comprising a belt filter press (1) and a filter belt (2) disposed on the belt filter press (1), characterized in that, Also includes: The detection strip (3) is provided along the edge of the filter strip (2), and the detection strip (3) is made of rubber fold-resistant material; A metal sheet (4) is wrapped inside the detection strip (3). When the metal sheet (4) breaks, the signal is cut off to trigger a shutdown and maintenance command. A sealed differential pressure detection box (5) is set at the detection station of the belt filter press (1). A closed detection chamber is formed inside the sealed differential pressure detection box (5) to detect the pressure difference on both sides of the filter belt (2) in real time. The detection port (6) is located on the side of the sealed differential pressure detection box (5), and the upper and lower ends of the detection strip (3) are respectively provided with a power supply head (7) and a detection head (8). The differential pressure testing box (5) includes: Mounting frame (9) is installed on the belt filter press (1); The elastic seal (10) is provided in two sets and is located at both ends of the filter belt (2) respectively, for forming a closed area between the filter belt (2) and the mounting frame (9) to detect pressure difference; The spring floating frame (11) has two sets and is fixedly installed at the upper and lower ends inside the mounting frame (9). The elastic seal (10) elastically abuts against the filter belt (2) through the spring floating frame (11) and applies pressure to the filter belt (2). A cleaning unit (12) is disposed on the side of the mounting frame (9), and its length direction is consistent with the width direction of the filter belt (2); The re-selection filter (13) is located below the cleaning unit (12); A differential pressure detection unit is installed within the mounting frame (9) to detect the differential pressure and control the cleaning unit (12) to adjust the cleaning mode.

2. The combined sewage and sludge treatment device according to claim 1, characterized in that, The metal sheet (4) is provided in two parts and does not intersect with each other. When the signal of one of the metal sheets (4) is cut off, an alarm is triggered. When the signals of both metal sheets (4) are cut off, a shutdown and maintenance command is triggered.

3. The combined sewage and sludge treatment device according to claim 2, characterized in that, The outer edge of the metal sheet (4) penetrates the detection strip (3) and extends outward. The power supply head (7) abuts against the extended end of the metal sheet (4) to provide power. The detection head (8) abuts against the extended end of the metal sheet (4) to collect the electrical signal of the metal sheet (4).

4. The combined sewage and sludge treatment device according to claim 3, characterized in that, The detection port (6) is also provided with a brush head (14) for cleaning the extension of the metal sheet (4).

5. A combined sewage and sludge treatment device according to claim 2, characterized in that, The elastic seal (10) includes a sealing strip (15) and a rubber sealing roller (16); the sealing strip (15) is arranged along a side parallel to the running direction of the filter belt (2), and the sealing strip (15) slides in cooperation with the detection belt (3); the rubber sealing roller (16) is arranged along a side perpendicular to the running direction of the filter belt (2), and the rotational linear speed of the rubber sealing roller (16) is consistent with the running speed of the filter belt (2) to achieve follow-up sealing, and the rubber sealing roller (16) is driven to rotate by a servo motor (18) mounted on the spring floating frame (11).

6. A combined sewage and sludge treatment device according to claim 5, characterized in that, The detection strip (3) is provided with a low-friction slide (19) for the sealing strip (15) to slide.

7. A combined sewage and sludge treatment device according to claim 6, characterized in that, The shaft end of the rubber sealing roller (16) passes through the sealing strip (15). A supplementary seal (20) is provided at the junction of the shaft end of the rubber sealing roller (16) and the sealing strip (15). A disc spring (21) and a retaining ring (22) are provided between the supplementary seal (20) and the spring floating frame (11). The disc spring (21) is located between the retaining ring (22) and the spring floating frame (11). The retaining ring (22) is in contact with the supplementary seal (20).

8. A combined sewage and sludge treatment device according to claim 7, characterized in that, The upper end of the rubber sealing roller (16) is provided with an elastic abutment plate (23), which elastically abuts against the upper surface of the rubber sealing roller (16) to prevent leakage between the upper end of the rubber sealing roller (16) and the wall of the detection box.

9. A combined sewage and sludge treatment device according to claim 1, characterized in that, The gravity dewatering zone of the belt filter press (1) includes multiple independent collection chambers (24) arranged sequentially along the running direction of the filter belt (2).

10. A combined sewage and sludge treatment device according to claim 9, characterized in that, The recirculation filter (13) includes an inclined plate sedimentation separation tank (25), which is connected to the collection chamber (24) and is used to perform gravity sedimentation separation on the collected filtrate to remove suspended solid particles in the filtrate; an overflow weir (26) is provided at the outlet end of the inclined plate sedimentation separation tank (25) and is used to control the liquid level of the filtrate and realize the stratified overflow separation of the clear liquid and the concentrated liquid; a screw conveyor (27) is provided at the bottom of the inclined plate sedimentation separation tank (25) and is used to continuously transport the sedimented and concentrated sludge to the sludge collection end.

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