A sewage treatment system

Abstract

The present application relates to the technical field of sewage treatment, and discloses a sewage treatment system, including an upper filter belt and a lower filter belt for squeezing sludge, a gravity dehydration section is provided at the portion of the upper filter belt away from the lower filter belt, an extrusion dehydration section is formed between the upper filter belt and the lower filter belt, and also includes a guide plate for guiding the sludge in the gravity dehydration section to the extrusion dehydration section, a control box with upper and lower openings is provided between the gravity dehydration section and the extrusion dehydration section, the lower end of the guide plate is close to the upper opening of the control box, the length direction of the control box extends along the width direction of the lower filter belt, the control box is located above the lower filter belt, a spacing is left between the control box and the lower filter belt, and the control box is provided with a vibrating assembly. The present application can obtain a filter cake with a lower water content.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment system. Background Art

[0002] The sewage treatment system containing sludge is a comprehensive system, which mainly includes the following parts: the pretreatment unit will initially filter the sludge; the main treatment units such as biochemical tanks, sedimentation tanks, etc., remove suspended matter in the sewage through physical and chemical methods; the sludge treatment unit will concentrate and squeeze the sludge, and finally discharge it into the effluent or reuse unit.

[0003] Reference Figure 1 In the sewage treatment system using sludge pressing, belt sludge dewatering machine is often used. The main working principle is that the sludge pretreated by chemical treatment is evenly fed into the upper filter belt 3 through the cloth hopper. The upper filter belt 3 close to the cloth hopper is tilted upward to form a gravity dewatering section. The main purpose is to make the sludge run upward with the upper filter belt 3. During the process, the free water enters the water receiving tank through the upper filter belt 3 under the action of its own weight. This step is mainly to remove the free water of the sludge and reduce the fluidity of the sludge, so as to prepare for the subsequent extrusion dewatering method. The sludge gradually enters between the upper filter belt 3 and the lower filter belt 4 along with the filter belt. The distance between the upper filter belt 3 and the lower filter belt 4 gradually decreases to form an extrusion dewatering section 2. The sludge begins to be subjected to slight pressure, and as the upper filter belt 3 and the lower filter belt 4 run, the pressure gradually increases, so that the free water in the sludge is squeezed out. After the sludge forms a filter cake, the water content of the sludge is greatly reduced.

[0004] With regard to the above-mentioned related technologies, during the gravity dewatering process of sludge, because the water content of sludge is different, if there is more free water in the sludge, the volume of sludge on the filter belt entering the extrusion dewatering section 2 is smaller, and if there is less free water in the sludge, the volume of sludge on the filter belt entering the extrusion dewatering section 2 is larger. When the distance between the upper filter belt 3 and the lower filter belt 4 gradually decreases, the distance between the two filter belts in the extrusion dewatering section 2 is determined according to the sludge volume. In the extrusion dewatering section 2, there is an unequal distance between the upper filter belt 3 and the lower filter belt 4. Therefore, the pressure of the upper filter belt 3 and the lower filter belt 4 to squeeze the sludge is also uneven, resulting in the part with less sludge volume between the upper filter belt 3 and the lower filter belt 4 being squeezed less, and the water content of the sludge finally forming the filter cake needs to be reduced. Summary of the invention

[0005] In order to further reduce the water content of the sludge after being squeezed, the present application provides a sewage treatment system.

[0006] The present application provides a sewage treatment system, which adopts the following technical solution:

[0007] A sewage treatment system comprises an upper filter belt and a lower filter belt for squeezing sludge, wherein a gravity dewatering section is arranged at the portion of the upper filter belt facing away from the lower filter belt, an extrusion dewatering section is formed between the upper filter belt and the lower filter belt, and further comprises a material guide plate for guiding the sludge in the gravity dewatering section to the extrusion dewatering section, wherein a quantity control box with upper and lower openings is arranged between the gravity dewatering section and the extrusion dewatering section, wherein the lower end of the material guide plate is close to the upper portion of the opening of the quantity control box, wherein the length direction of the quantity control box extends along the width direction of the lower filter belt, wherein the quantity control box is located above the lower filter belt, and a spacing is left between the quantity control box and the lower filter belt, and wherein the quantity control box is provided with a vibration assembly.

[0008] By adopting the above technical scheme, after the sludge is initially dehydrated through the gravity dehydration section, it gradually enters the lower filter belt through the guide plate. The quantity control box is located above the lower filter belt. The quantity control box has the effect of gathering the sludge, and the vibration of the sludge by the vibrating assembly can also enhance the density of the sludge, so that the sludge can enter between the lower filter belt and the upper filter belt in sufficient quantity. There is a gap between the bottom of the quantity control box and the lower filter belt. The bottom of the quantity control box is also equivalent to a scraper. When the lower filter belt moves forward with the sludge, the bottom of the quantity control box has the effect of leveling the sludge, so that the sludge can maintain a uniform thickness and enter between the upper filter belt and the lower filter belt. In the extrusion dehydration section, there is a situation where the distance between the upper filter belt and the lower filter belt remains basically equal. Therefore, the pressure of the upper filter belt and the lower filter belt to squeeze the sludge is equal. After the sludge is evenly squeezed, a filter cake with a lower water content can be obtained.

[0009] Optionally, the vibrating assembly includes a vibrating rod and a driving member that drives the vibrating rod to move up and down, the vibrating rod is installed in the quantity control box, and the driving member is installed outside the quantity control box.

[0010] By adopting the above technical solution, the driving member drives the vibrating rod to move up and down in the control box to vibrate the sludge. Through the vibration treatment, the water and solid particles in the sludge are better separated, and the dehydration effect of the sludge is improved. At the same time, the vibration effect can also prevent the sludge from clogging in the control box, ensuring the smooth operation of the system.

[0011] Optionally, a plurality of vibrating rods are provided, and a plurality of the vibrating rods are connected to the same linkage rod.

[0012] By adopting the above technical solution, this design not only improves the vibration efficiency, but also ensures the uniform treatment of sludge in each area, avoiding the occurrence of insufficient or excessive local treatment.

[0013] Optionally, a compaction assembly is also installed in the quantity control box, and the compaction assembly corresponds to the vibrating rod one by one. The compaction assembly includes a support rod and a pressure plate, one side of the pressure plate is rotatably mounted on the support rod, and the vibrating rod is fixedly mounted with a guide rod, and the other side of the pressure plate slides on the guide rod.

[0014] By adopting the above technical scheme, the pressing plate moves up and down under the guidance of the vibrating rod, and the sludge is compacted by the pressing rod and the pressure plate. The compaction treatment can further remove moisture from the sludge and improve the dryness of the sludge. At the same time, the compaction effect can also make the sludge fit more closely on the lower filter belt, thereby improving the pressing effect. When the pressing plate rotates upward and is in a horizontal state, the pressing plate can take over part of the sludge in the control box, thereby achieving the weight reduction effect of the lower filter belt and keeping the lower filter belt in an appropriately tensioned state.

[0015] Optionally, a pressure rod is rotatably mounted on the lower surface of the pressure plate, and a pressure plate is fixedly mounted on the lower end of the pressure rod.

[0016] By adopting the above technical solution, when the pressure plate swings, because the pressure rod is rotatably installed on the lower surface of the pressure plate, it can better maintain a vertical state due to the effect of gravity, so that the pressure plate can maintain its shape and press down the sludge, thereby enhancing the sludge density.

[0017] Optionally, the linkage rod is located outside the quantity control box, the linkage rod is equipped with a connecting rod for connecting with the vibrating rod, and the side wall of the quantity control box is provided with a sliding groove for the connecting rod to slide.

[0018] Optionally, the chute is located on the side of the control box away from the conveying direction of the lower filter belt.

[0019] By adopting the above technical solution, the chute is located in the conveying direction of the quantity control box away from the lower filter belt. Even if the sludge leaves the quantity control box from the chute and falls onto the lower filter belt, the sludge must pass through the quantity control box along with the lower filter belt so that the sludge is re-controlled and enters the extrusion and dehydration section.

[0020] Optionally, the slide groove is located on a side of the quantity control box close to the conveying direction of the lower filter belt, and a sealing plate for blocking the slide groove is installed on the linkage rod, and the sealing plate slides on the outer wall of the quantity control box.

[0021] By adopting the above technical solution, the chute is located on the side of the quantity control box close to the conveying direction of the lower filter belt. The sludge leaving the chute will no longer pass through the quantity control box, which will affect the sludge maintaining uniform thickness entering the extrusion dehydration section. Therefore, it is necessary to close the chute with a sealing plate.

[0022] Optionally, a metering strip and a sensor for sensing the metering strip are installed at the bottom of the metering control box. The sensor is located at the bottom of the metering control box on a side away from the lower filter belt, and the metering strip is located at the bottom of the metering control box on a side close to the lower filter belt.

[0023] By adopting the above technical solution, the sludge accumulation amount can be monitored in real time to ensure that the sludge amount is always kept within an appropriate range, thereby avoiding the sludge entering the extrusion dehydration section without maintaining uniform thickness due to insufficient sludge amount.

[0024] In summary, the present application includes at least one of the following beneficial effects:

[0025] 1. The quantity control box allows the sludge to maintain uniform thickness when entering the extrusion dehydration section. The spacing between the upper filter belt and the lower filter belt is close to the same, and the sludge pressure between the upper filter belt and the lower filter belt is also relatively equal. The upper filter belt and the lower filter belt have basically the same effect on sludge extrusion, which can better squeeze the sludge and reduce the water content of the filter cake;

[0026] 2. Combined with the use of compaction components, the sludge can be compacted during the vibration process to further remove the moisture inside the sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a belt-type sludge dewatering machine of the related art;

[0028] Figure 2 is a cross-sectional view of the overall structure of the belt-type sludge dewatering machine according to an embodiment of the present application;

[0029] Figure 3 yes Figure 2 A magnified schematic diagram of point A;

[0030] Figure 4 This is a schematic diagram of the overall structure of the volume control box in an embodiment of the present application;

[0031] Figure 5 This is a cross-sectional view of the overall structure of the volume control box in an embodiment of the present application;

[0032] Figure 6 is a cross-sectional view of a compaction assembly of an embodiment of the present application connected to a pressure plate;

[0033] Figure 7 It is a structural schematic diagram of an embodiment of the present application in which the chute is located on the side of the quantity control box away from the conveying direction of the lower filter belt;

[0034] Figure 8 is a structural cross-sectional view of an embodiment of the present application in which the chute is located on the side of the quantity control box away from the conveying direction of the lower filter belt;

[0035] Fig. 9 This is a schematic diagram of the structure of an embodiment of the present application in which the chute is located on the side of the quantity control box close to the conveying direction of the lower filter belt;

[0036] Fig.10 This is a structural cross-sectional view of an embodiment of the present application in which the chute is located on the side of the quantity control box close to the conveying direction of the lower filter belt.

[0037] Explanation of the accompanying drawings: 1. Gravity dehydration section; 2. Extrusion dehydration section; 3. Upper filter belt; 4. Lower filter belt; 5. Quantity control box; 51. Quantity verification strip; 52. Sensor; 53. Slide; 6. Guide plate; 7. Vibrating assembly; 71. Vibrating rod; 72. Driving member; 73. Linkage rod; 74. Connecting rod; 8. Compacting assembly; 81. Support rod; 82. Pressing plate; 821. Sliding rod; 822. Limiting block; 83. Pressing rod; 84. Pressure plate; 9. Guide rod; 91. Guide groove; 10. Sealing plate. DETAILED DESCRIPTION

[0038] The following is combined with Figure 2-10 This application is described in further detail.

[0039] The present application discloses a sewage treatment system. A sewage treatment system includes a pretreatment unit to perform preliminary filtration of sludge: a main treatment unit such as a biochemical tank, a sedimentation tank, etc., to remove suspended matter in sewage by physical and chemical methods, a sludge treatment unit to concentrate and squeeze the sludge, and finally to discharge the effluent or reuse the unit.

[0040] Reference Figure 2 In the sludge treatment unit, the sludge is lifted from the thickening tank or the thickening tank and put into the sludge pressing treatment equipment for sludge pressing. The sludge pressing treatment equipment mainly uses a belt-type sludge dewatering machine, which includes an upper filter belt 3 and a lower filter belt 4 for squeezing sludge. The portion of the upper filter belt 3 away from the lower filter belt 4 is provided with a gravity dewatering section 1. The portions of the upper filter belt 3 and the lower filter belt 4 that are close to each other pass through a plurality of transmission rollers in turn, so that an extrusion dewatering section 2 is formed between the upper filter belt 3 and the lower filter belt 4. The sludge is continuously squeezed by the upper filter belt 3 and the lower filter belt 4, so that the free water leaves the sludge, and the sludge forms a filter cake and is discharged.

[0041] In order to make the sludge enter the squeeze dewatering section 2 from the gravity dewatering section 1 and the thickness of the sludge sandwiched between the upper filter belt 3 and the lower filter belt 4 approach the same thickness, a material guide plate 6 and a control box 5 with upper and lower openings are arranged between the gravity dewatering section 1 and the squeeze dewatering section 2, and the length direction of the control box 5 extends along the width direction of the lower filter belt 4. The lower end of the material guide plate 6 tilted downward is located above the opening of the control box 5, and a gap is left between the bottom end surface of the control box 5 and the lower filter belt 4. After passing through the control box 5, the sludge enters the lower filter belt 4, and the sludge is accumulated in the control box 5. The setting of the quantity control box 5 ensures that only the sludge within the distance between the quantity control box 5 and the lower filter belt 4 will move with the lower filter belt 4, so that the sludge maintains a uniform thickness and enters between the lower filter belt 4 and the upper filter belt 3, so that when the extrusion and dewatering section 2 squeezes the sludge, the sludge volume between the upper filter belt 3 and the lower filter belt 4 is basically equal, the distance between the upper filter belt 3 and the lower filter belt 4 is close to the same, and the sludge pressure between the upper filter belt 3 and the lower filter belt 4 is also relatively equal.

[0042] Reference Figure 3 , the bottom of the volume control box 5 is equipped with a metering strip 51 and a sensor 52 for sensing the metering strip 51. The sensor 52 is installed at the bottom of the volume control box 5 on the side away from the transmission direction of the lower filter belt 4, and the metering strip 51 is installed at the bottom of the volume control box 5 on the side close to the lower filter belt 4. Generally, the sludge in the volume control box 5 falls on the lower filter belt 4 and is located between the sensor 52 and the metering strip 51. The sensor 52 cannot sense the metering strip 51, and the belt-type sludge dewatering machine can operate normally. If the sensor 52 senses the position of the metering strip 51, an alarm will sound, indicating that the amount of sludge in the volume control box 5 is very small, and the thickness of the sludge to enter the upper filter belt 3 and the lower filter belt 4 is thinning. You can stop the belt-type sludge dewatering machine first and check the situation.

[0043] Reference Figure 3 , there is sludge constantly accumulating in the quantity control box 5. In order to increase the density of the sludge, the quantity control box 5 is provided with a vibrating assembly 7. The vibration of the vibrating assembly 7 can also remove some free moisture from the sludge. The vibrating assembly 7 includes a vibrating rod 71 and a driving member 72 that drives the vibrating rod 71 to move up and down. Among them, the vibrating rod 71 is directly installed in the quantity control box 5, responsible for direct contact with the sludge and vibrating operation; and the driving member 72 is installed on the outside of the quantity control box 5, and is connected to the vibrating rod 71 through an appropriate transmission mechanism to provide it with the power required for up and down movement. Such a design not only ensures the effectiveness of the vibration operation, but also facilitates the maintenance and management of the driving member 72.

[0044] Reference Figure 4 , this embodiment further optimizes the number and layout of the vibrating rods 71. Specifically, a plurality of vibrating rods 71 ​​are arranged in the quantity control box 5, and these vibrating rods 71 ​​are connected to each other through a linkage rod 73, so that they can move up and down synchronously. The linkage rod 73 is equivalent to a transmission mechanism. The arrangement of a plurality of vibrating rods 71 ​​increases the contact area with the sludge and improves the efficiency of the vibrating operation.

[0045] The driving member 72 can be a cylinder, a hydraulic cylinder or an electric telescopic rod. The piston rod of the driving member 72 is fixedly connected to the linkage rod 73. A protective shell for covering the driving member 72 is installed on the control box 5 to prevent the driving member 72 from contacting with water.

[0046] Reference Figure 4 and Figure 5, this embodiment further introduces a compaction assembly 8 to enhance the treatment effect of sludge. The compaction assembly 8 is arranged in a one-to-one correspondence with the vibrating rod 71, and each compaction assembly 8 includes a support rod 81 and a pressure plate 82. One side of the pressure plate 82 is connected to the support rod 81 by a rotating connection, so that it can swing freely within a certain range; and the vibrating rod 71 is fixedly installed with a horizontally arranged guide rod 9, and the other side of the pressure plate 82 is slidably installed on the guide rod 9. A guide groove 91 is provided on the guide rod 9, and the length direction of the guide groove 91 and the length direction of the vibrating rod 71 are perpendicular to each other. The pressure plate 82 is hinged with a slide bar 821, and the slide bar 821 is slidably installed in the guide groove 91. The slide bar 821 passes through the guide groove 91 and is fixedly connected to a limit block 822, and the limit block 822 limits the slide bar 821 from leaving the guide groove 91. In the process of the vibrating rod 71 moving up and down, the pressure plate 82 is affected by it and slides accordingly along the guide rod 9, and compacts the sludge. Through such a design, not only the dewatering efficiency of the sludge is improved, but also the internal structure of the sludge is made more compact, which is convenient for subsequent processing.

[0047] Reference Figure 6 A pressure rod 83 is rotatably mounted on the lower surface of the pressure plate 82, and a pressure plate 84 is fixedly mounted on the lower end of the pressure rod 83. This design allows the pressure rod 83 and the pressure plate 84 to apply additional pressure to the sludge during the sliding of the pressure plate 82, thereby further improving its dehydration effect. At the same time, due to the rotational connection between the pressure rod 83 and the pressure plate 82, the pressure plate 84 can more flexibly adapt to the shape changes of the sludge surface, ensuring the uniformity and effectiveness of the compaction operation.

[0048] The linkage rod 73 is located outside the volume control box 5, and the linkage rod 73 is equipped with a connecting rod 74, which is fixedly connected to the vibrating rod 71, and the connecting rod 74 corresponds to the vibrating rod 71. The side wall of the volume control box 5 is provided with a slide groove 53 for the sliding of the connecting rod 74, and the slide groove 53 also corresponds to the connecting rod 74.

[0049] Reference Figure 7 and Figure 8 The chute 53 can be located on the side of the quantity control box 5 away from the conveying direction of the lower filter belt 4. Although part of the sludge in the quantity control box 5 flows out of the quantity control box 5 through the chute 53, the sludge still has to accompany the lower filter belt 4 to pass under the quantity control box 5, and the sludge amount will still be controlled by the quantity control box 5. The sludge maintains a uniform thickness and enters between the lower filter belt 4 and the upper filter belt 3.

[0050] Reference Fig. 9 and Fig.10The chute 53 can also be located on the side of the control box 5 close to the conveying direction of the lower filter belt 4. If the sludge flows out of the control box 5, the sludge is no longer controlled by the control box 5, so it is necessary to install a sealing plate 10 on the control box 5 to block the chute 53. The sealing plate 10 is fixedly installed on the linkage rod 73. The sealing plate 10 is located outside the control box 5 and fits the outer wall of the control box 5. It also moves with the movement of the linkage rod 73, so that the chute 53 is always in a closed state.

[0051] The implementation principle of a sewage treatment system in the embodiment of the present application is:

[0052] The gravity dewatering section 1 makes the sludge move upward, and the free water enters the water receiving trough through the upper filter belt 3 under the action of its own weight. The fluidity of the sludge gradually decreases, and the sludge first enters the control box 5 along with the guide plate 6. The control box 5 has a gathering effect on the sludge. A fixed distance is left between the control box 5 and the lower filter belt 4. After the sludge falls on the lower filter belt 4, the movement of the lower filter belt 4 brings the sludge forward, but due to the control of the control box 5, the part of the sludge leaving the control box 5 is accompanied by the movement of the lower filter belt 4 and is flattened by the bottom of the control box 5, so that the sludge can maintain a uniform thickness and enter between the lower filter belt 4 and the upper filter belt 3, reducing the occurrence of unequal sludge volumes between the upper filter belt 3 and the lower filter belt 4, and can also make the sludge be squeezed out of water better, further reducing the water content of the sludge after being squeezed;

[0053] When sludge accumulates in the quantity control box 5, the cooperation of the vibrating assembly 7 and the compacting assembly 8 can make the sludge enter more densely between the upper filter belt 3 and the lower filter belt 4, and the pressing plate 82 moves upward along with the vibrating plate, and the pressing plate 82 intermittently approaches a horizontal state. The pressing plate 82 can play a role in indirectly receiving the sludge, reducing the sludge pressure on the lower filter belt 4. The lower filter belt 4 can receive the accumulated sludge by maintaining an appropriate tension state.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sewage treatment system, comprising an upper filter belt (3) and a lower filter belt (4) for squeezing sludge, wherein a portion of the upper filter belt (3) away from the lower filter belt (4) is provided with a gravity dewatering section (1), a squeezing dewatering section (2) is formed between the upper filter belt (3) and the lower filter belt (4), and further comprising a guide plate (6) for guiding the sludge in the gravity dewatering section (1) to the squeezing dewatering section (2), characterized in that: A volume control box (5) with upper and lower openings is arranged between the gravity dehydration section (1) and the extrusion dehydration section (2); the lower end of the material guide plate (6) is close to the upper part of the opening of the volume control box (5); the length direction of the volume control box (5) extends along the width direction of the lower filter belt (4); the volume control box (5) is located above the lower filter belt (4); a distance is left between the volume control box (5) and the lower filter belt (4); the volume control box (5) is provided with a vibrating assembly (7); the vibrating assembly (7) comprises a vibrating rod (71) and a driving member (72) for driving the vibrating rod (71) to move up and down; the vibrating rod (71) is installed on the volume control box. The control box (5) is provided with a plurality of vibrating rods (71), and a plurality of the vibrating rods (71) are connected to the same linkage rod (73); a compaction assembly (8) is also installed in the control box (5), the compaction assembly (8) and the vibrating rods (71) correspond one to one, the compaction assembly (8) comprises a support rod (81) and a pressure plate (82), one side of the pressure plate (82) is rotatably mounted on the support rod (81), the vibrating rod (71) is fixedly mounted with a guide rod (9), and the other side of the pressure plate (82) slides on the guide rod (9).

2. A sewage treatment system according to claim 1, characterized in that: A pressure rod (83) is rotatably mounted on the lower surface of the pressure plate (82), and a pressure plate (84) is fixedly mounted on the lower end of the pressure rod (83).

3. A sewage treatment system according to claim 1, characterized in that: The linkage rod (73) is located outside the volume control box (5), and the linkage rod (73) is provided with a connecting rod (74) for connecting to the vibrating rod (71). A sliding groove (53) for sliding the connecting rod (74) is provided on a side wall of the volume control box (5).

4. A sewage treatment system according to claim 3, characterized in that: The chute (53) is located on a side of the quantity control box (5) that is away from the conveying direction of the lower filter belt (4).

5. A sewage treatment system according to claim 3, characterized in that: The slide groove (53) is located on a side of the quantity control box (5) close to the conveying direction of the lower filter belt (4), and a sealing plate (10) for sealing the slide groove (53) is installed on the linkage rod (73), and the sealing plate (10) slides on the outer wall of the quantity control box (5).

6. A sewage treatment system according to claim 1, characterized in that: A metering strip (51) and a sensor (52) for sensing the metering strip (51) are installed at the bottom of the metering box (5); the sensor (52) is located at the bottom of a side of the metering box (5) facing away from the lower filter belt (4); and the metering strip (51) is located at the bottom of a side of the metering box (5) close to the lower filter belt (4).

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