Municipal sewage treatment system and method

Abstract

The invention relates to the field of sewage treatment, and particularly discloses a municipal sewage treatment system and method.The municipal sewage treatment system comprises a grid filter part, a sedimentation tank, an aeration tank and an ultraviolet exposure tank which are used for sewage to flow through in sequence; wherein a cloth bag filter part is arranged between the grid filter part and the sedimentation tank; the cloth bag filter part comprises flexible filter cloth and a plurality of connecting blocking parts; filter holes for sewage to flow through are formed in the flexible filter cloth; the connecting blocking parts are provided with supporting surfaces which repel the flexible filter cloth; a filter cloth roller; a winding member; and a guide member. The device has the effects that large-particle solids can be intercepted, small-particle solids can also be intercepted, and when sludge is intercepted, sludge blockage can be better prevented, and the sludge can be conveyed outwards.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a municipal sewage treatment system and method. BACKGROUND

[0002] At present, sewage treatment is a process of removing particulate matter in sewage and disinfecting sewage to change sewage into non-polluted water quality.

[0003] In the related art, a Chinese patent with application number CN202411756877.3 proposes to filter sewage by using an intercepting grid, so that solid particles in the sewage are intercepted, and then a fishing mechanism is used to separate the solid particles intercepted by the intercepting grid from the intercepting grid, thereby avoiding the situation that the intercepting grid is blocked and the sewage treatment is slowed down. The fishing mechanism adopts a straight-line moving tooth harrow which contacts the intercepting grid to clean the intercepting grid.

[0004] In view of the above related art, the inventors believe that the following defects exist: The intercepting grid can only intercept solid objects with relatively large particles. When a smaller size intercepting grid is used to intercept solid objects with small particles, if there is too much sludge intercepted on the intercepting grid when the tooth harrow cleans the intercepting grid, the tooth harrow is difficult to clean the sludge. Moreover, when the sludge is plugged into the gap in the intercepting grid, the tooth harrow is also difficult to clean it. SUMMARY

[0005] In order to improve the problem that when the intercepting grid intercepts small particles such as sludge, the sludge is difficult to be cleaned when it is plugged into the gap in the intercepting grid, the present application provides a municipal sewage treatment system and method.

[0006] The municipal sewage treatment system and method provided by the present application adopts the following technical solution: A municipal sewage treatment system, comprising: a grid filter, a sedimentation tank, an aeration tank and an ultraviolet exposure tank through which sewage flows in sequence; wherein a bag filter is arranged between the grid filter and the sedimentation tank; the bag filter comprises: a flexible filter cloth forming filter holes through which sewage flows and a plurality of connecting blocking parts having repelling supporting surfaces with the flexible filter cloth; a filter cloth roller arranged above the water surface of the sewage; a winding member for winding the flexible filter cloth on the filter cloth roller into the winding member; a guide member for moving the flexible filter cloth along a first preset track in the sewage and moving the flexible filter cloth along a second preset track at least partially outside the sewage; the first preset track makes the flexible filter cloth inclined to the water surface of the sewage, and when the flexible filter cloth is conveyed away from the sewage, the supporting surface is located on the side of the flexible filter cloth close to the sewage; an injection port is formed on the sedimentation tank, and the flexible filter cloth contacts the inner wall of the injection port.

[0007] Through the technical scheme, the sewage is firstly filtered by the grid filter, and large garbage such as plastic bottles is filtered. Then, the sewage is filtered by the flexible filter cloth, and the filtered sewage is deposited in the sedimentation tank, so that the solid particles in the sewage are deposited at the bottom of the sedimentation tank, and the liquid flows into the aeration tank, and the solid particles with light quality in the sewage are further treated in the aeration tank. Then, the sewage is treated by sterilization in the ultraviolet exposure tank. The flexible filter cloth is arranged to treat the small solid particles in the sewage, so that the content of the solid particles in the sewage is reduced, the treatment speed is fast when the sewage is treated in the sedimentation tank and the aeration tank, and the overall treatment speed of the sewage is increased. In addition, the supporting surface formed on the flexible filter cloth can not only filter the dirt but also remove the dirt, that is, transport the dirt outward. Therefore, the application can not only intercept and remove the large solid particles but also intercept and remove the small solid particles, so that compared with the traditional scheme of arranging multiple sedimentation tanks, the space is saved, the cost is reduced, and the efficiency is improved.

[0008] In addition, the flexible filter cloth is transported to intercept the dirt, and when the dirt blocks the flexible filter cloth, the flexible filter cloth is transported to make the flexible filter cloth that is not blocked intercept the small solid particles, so that the speed of the sewage flowing through the flexible filter cloth is kept good at all times, and the interception effect of the flexible filter cloth is kept good. When the flexible filter cloth is below the water surface, the flexible filter cloth is reversely inclined relative to the transportation of the sewage, so that the area of the flexible filter cloth for filtering and treating the sewage is increased, and the treatment effect of the sewage is improved.

[0009] Optionally, the flexible filter cloth forms multiple bending parts in the width direction to form multiple concave grooves on the flexible filter cloth. The multiple bending parts of the flexible filter cloth increase the area of the flexible filter cloth in the sewage, and the filtering effect of the flexible filter cloth is better.

[0010] Optionally, the connecting blocking part forms accommodating cavities on the flexible filter cloth, and multiple accommodating cavities are arranged. The multiple accommodating cavities all have openings, and the opening directions of the openings are matched with the transportation direction of the flexible filter cloth.

[0011] Through the above technical scheme, the accommodating cavities can accommodate the dirt, that is, the small solid particles, so that the small solid particles are intercepted and transported outward.

[0012] Optionally, the flexible filter cloth is provided with quick release parts at both ends, and the two quick release parts are combined to fix one section of the flexible filter cloth and another section of the flexible filter cloth.

[0013] By adopting the technical scheme, after the filter cloth roller is completely placed, the new filter cloth roller is directly placed at the corresponding position, and then the flexible filter cloth on the new filter cloth roller is connected together with the flexible filter cloth on the old filter cloth roller through the quick release part, so that the old filter cloth roller itself is directly replaced, and the replacement process is simple and fast.

[0014] Optionally, the quick release part comprises a first docking portion, a second docking portion, and a connecting portion connecting the first docking portion and the second docking portion, a docking groove is formed between the first docking portion and the second docking portion, a locking member is arranged in the docking groove, the docking groove is used for inserting the first docking portion or the second docking portion, and the locking member locks the first docking portion or the second docking portion when the first docking portion or the second docking portion is inserted into the docking groove.

[0015] Optionally, the municipal sewage treatment system further comprises a storage tank, a storage cavity is formed in the storage tank, and an inlet and an outlet are communicated with the storage cavity, the inlet is used for feeding the flexible filter cloth into the storage cavity, the outlet is used for discharging the flexible filter cloth in the storage cavity, a stopper is arranged at the outlet and used for stopping the flexible filter cloth from being discharged outwards, a feeder is arranged at the inlet and used for continuously or discontinuously feeding the flexible filter cloth into the storage cavity, a drying device is arranged in the storage cavity and used for drying the flexible filter cloth in the storage cavity, and a scraping part is further arranged at the outlet and used for abutting against both sides of the flexible filter cloth.

[0016] By adopting the technical scheme, the flexible filter cloth is dried, so that the sludge on the flexible filter cloth is dried, thereby making the soil dry, and the sludge is easily crushed into sand particles and separated from the flexible filter cloth, so that the sludge is separated from the flexible filter cloth, and the sludge is separated from the flexible filter cloth without using water, thereby saving water and cleaning the flexible filter cloth.

[0017] Optionally, a bearing body having a hollow region is arranged in the storage cavity, and a driving device is arranged and used for driving the bearing body to rotate around a fixed axis from a first rotation position to a second rotation position, the bearing body is arranged in the storage cavity at an angle relative to the flexible filter cloth in the storage tank when the bearing body is located at the first rotation position, and the bearing body is horizontally arranged in the storage cavity relative to the flexible filter cloth in the storage tank when the bearing body is located at the second rotation position.

[0018] By adopting the technical scheme, the bearing body is used to apply an external beating force to the flexible filter cloth, so that the dried sludge on the flexible filter cloth is more easily crushed and separated from the flexible filter cloth.

[0019] Optionally, the municipal sewage treatment system further comprises a cleaning member for cleaning the flexible filter cloth discharged outwardly from the outlet; the cleaning member comprises a cleaning box, a profiling structure, a water injection structure and a water drainage structure; the profiling structure forms a profiling surface abutting against the flexible filter cloth and elastically deforming the flexible filter cloth; the profiling structure forms a plurality of discharge ports on the profiling surface; the profiling structure is arranged in the cleaning box; the water injection structure is configured to inject water into the discharge ports; and the water drainage structure is located on a side of the flexible filter cloth away from the profiling surface.

[0020] Optionally, a part of the flexible filter cloth in contact with the profiling surface is transported downwardly in the conveying direction; and the water drainage direction of the discharge ports is inclined downwardly.

[0021] A municipal sewage treatment method comprises the following steps: sequentially making the sewage flow through a grid filter, a cloth bag filter, a sedimentation tank, an aeration tank and an ultraviolet exposure tank; the method for making the sewage flow through the cloth bag filter comprises the following steps: arranging a flexible filter cloth forming filter holes for the sewage to flow through in the sewage, the flexible filter cloth having a plurality of connecting blocking portions abutting against repelling surfaces of the flexible filter cloth; arranging a filter cloth roller having the flexible filter cloth wound thereon above the water surface of the sewage; using a winding member to wind the flexible filter cloth on the filter cloth roller into the winding member; using a guide member to make the flexible filter cloth move along a first preset track in the sewage and at least partially outside the sewage along a second preset track; the first preset track makes the flexible filter cloth be inclined to the water surface of the sewage, and when the flexible filter cloth is conveyed away from the sewage, the repelling surfaces are located on a side of the flexible filter cloth close to the sewage; and forming an injection port on the sedimentation tank, and the flexible filter cloth is in contact with the inner wall of the injection port.

[0022] In summary, the present application has at least one of the following beneficial technical effects: 1. The present application can intercept both large and small solid particles, and can better prevent sludge from being blocked and convey the sludge outwardly when intercepting the sludge; 2. The present application can better convey the intercepted sludge outwardly during the conveying process by using the arrangement of the containing chamber; 3. The present application can better separate the sludge on the flexible filter cloth from the flexible filter cloth by using the arrangement of the storage box to dry the flexible filter cloth, and then dry the sludge on the flexible filter cloth to become a state easy to be crushed into sand particles. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a whole schematic view according to an embodiment of the present application; Figure 2 is a structural schematic view of a part of the embodiment, mainly showing the structure of Figure 1 from another viewing angle; Figure 3 is a structural diagram that is part of an embodiment, mainly showing the structure of the sewage pool and part of the surrounding parts; Figure 4 is a structural diagram that is part of an embodiment, mainly showing the structure of Figure 3 from another viewing angle; Figure 5 is a structural diagram that is part of an embodiment, mainly showing the structure of the rotating part and the profiled structure; Figure 6 is a structural diagram that is part of an embodiment, mainly showing the structure of the driving part and the carrier; Figure 7 is a structural diagram that is part of an embodiment, mainly showing the structure of Figure 3 in cross section; Figure 8 is a structural diagram that is part of an embodiment, mainly showing the partial structure of Figure 7 ; Figure 9 is a structural diagram that is part of an embodiment, mainly showing the structure when two flexible filter cloths are butted together; Figure 10 is a structural diagram that is part of an embodiment, mainly showing a schematic diagram of the bending part; Figure 11 is a structural diagram that is part of an embodiment, mainly showing the structure of the first butt joint and the second butt joint; Figure 12 is a structural diagram that is part of an embodiment, mainly showing another schematic diagram of the bending part; Figure 13 is a structural diagram that is part of an embodiment, mainly showing the cross-sectional structure of Figure 9 ; Figure 14 is a structural diagram that is part of an embodiment, mainly showing an exploded view of Figure 13 ; Figure 15 is a structural diagram that is part of an embodiment, mainly showing the structure of the connecting stop and the flexible filter cloth.

[0024] Reference signs: 1, sewage pool; 11, sewage storage cylinder; 12, grid filter; 2, sedimentation tank; 3, aeration tank; 4, ultraviolet exposure tank; 5, flexible filter cloth; 51, opening; 52, connecting stop; 53, bending part; 54, concave gap; 55, containing chamber; 56, first docking part; 57, second docking part; 58, connecting part; 59, locking member; 6, filter cloth roller; 61, winding part; 7, guide part; 8, storage box; 81, stop part; 82, feeding part; 83, scraping part; 84, carrier; 841, elastic structure; 85, driving part; 9, cleaning part; 91, cleaning box; 92, profile structure; 93, water injection structure; 94, drainage structure; 95, rotating part. DETAILED DESCRIPTION

[0025] The following will be described in detail with reference to the accompanying drawings. Figures 1-15 The application will be described in further detail.

[0026] A municipal sewage treatment system comprises a grid filter 12, a sedimentation tank 2, an aeration tank 3 and an ultraviolet exposure tank 4 through which sewage flows in sequence. A bag filter is arranged between the grid filter 12 and the sedimentation tank 2. The grid filter 12 forms a large filter opening to filter out large garbage waste. The bag filter is used to filter out small garbage waste. The system further comprises a sewage storage cylinder 11 and a sewage pool 1. The sewage storage cylinder 11 is used to store sewage to be treated. The purpose of the sewage storage cylinder 11 is to store sewage and then gradually treat the sewage. A pump body is used to add the sewage in the sewage storage cylinder 11 to the sewage pool 1. The grid filter 12 and the bag filter are both located in the sewage pool 1. After the sewage passes through the grid filter 12 and the bag filter, it enters the sedimentation tank 2.

[0027] The bag filter comprises a flexible filter cloth 5, a filter cloth roller 6, a winding part 61 and a guide part 7.

[0028] The flexible filter cloth 5 forms filter holes through which sewage flows and a plurality of connecting stop parts 52 having a supporting surface repelling the flexible filter cloth 5. In this embodiment, the connecting stop part 52 is a part of the flexible filter cloth 5. The connecting stop part 52 can be a protruding cloth. The connecting stop part 52 forms a supporting surface relative to the protruding part of the flexible filter cloth 5. The connecting stop part 52 can also be a rigid body, such as a plate body, arranged on the flexible filter cloth 5. The plate body is fixed to the flexible filter cloth 5 by means of bolts or adhesion, so that the plate body forms the supporting surface. The supporting surface repelling the flexible filter cloth 5 means that the supporting surface does not overlap the flexible filter cloth 5. Therefore, the supporting surface protrudes outward relative to the flexible filter cloth 5.

[0029] The filter cloth roller 6 is arranged above the water surface of the sewage, and the winding member 61 is used for winding the flexible filter cloth 5 on the filter cloth roller 6 into the winding member 61. The filter cloth roller 6 is a roller body winding the flexible filter cloth 5 for multiple turns, and the winding member 61 is a structure composed of a motor and a winding roller, which is used for winding the flexible filter cloth 5, so that the flexible filter cloth 5 is transported between the filter cloth roller 6 and the winding member 61. The guide member 7 is used for moving the flexible filter cloth 5 along a first preset track in the sewage and at least partially along a second preset track outside the sewage. The guide member 7 adopts a plurality of guide rollers, the flexible filter cloth 5 is arranged on the guide rollers, and the number and spatial position of the guide rollers set the transport track of the flexible filter cloth 5. Therefore, the flexible filter cloth 5 moves along the first preset track and the second preset track. The first preset track is inclined to the water surface of the sewage, and when the flexible filter cloth 5 is transported away from the sewage, the supporting surface is located on the side of the flexible filter cloth 5 close to the sewage. Therefore, when the flexible filter cloth 5 is transported below the liquid surface of the sewage, the flexible filter cloth 5 filters the sewage, and the dirt in the sewage is left on the flexible filter cloth 5. With the transport of the flexible filter cloth 5, the dirt falls down, so that the supporting surface is used to support the falling dirt, so that the flexible filter cloth 5 can transport the dirt, the flexible filter cloth 5 filters the dirt in the sewage and moves the dirt above the liquid surface of the sewage, thereby realizing filtering and removing. The sedimentation tank 2 is provided with an injection port, and the flexible filter cloth 5 is in contact with the inner wall of the injection port. The injection port of the sedimentation tank 2 is communicated with the grid filter 12. The grid filter 12 is arranged in a pool body, and the flexible filter cloth 5 is also arranged in the pool body. The pool body is communicated with the sedimentation tank 2 through the injection port, so that the flexible filter cloth 5 is in contact with the inner wall of the injection port, and the sewage can reach the next process after passing through the flexible filter cloth 5, that is, the position of the sedimentation tank 2.

[0030] In the embodiment, the flexible filter cloth 5 is transported in the sewage from top to bottom into the sewage, and then from bottom to top out of the sewage. The part of the flexible filter cloth 5 out of the sewage is in contact with the inner wall of the injection port, and the part of the flexible filter cloth 5 into the sewage is located in the sedimentation tank 2 or the position of the injection port. In addition, the second preset track is a transport track above the liquid surface of the sewage. In the embodiment, the preferred second preset track is located on the side away from the sedimentation tank 2 of the first preset track. Therefore, when the flexible filter cloth 5 outputs the dirt on the flexible filter cloth 5 in the sewage, the dirt can fall into the sewage and be filtered again, so as to avoid entering the sedimentation tank 2 and improve the filtering and removing effect. The positions of the plurality of guide rollers are shown in the drawings and will not be described in detail. Figure 7

[0031] ​In the embodiment, the flexible filter cloth 5 is attached to the inner wall of the injection port. The flexible filter cloth 5 can be attached to the inner wall of the injection port by setting a block with a guide groove on the inner wall of the injection port, setting a press wheel in the guide groove, and locating the edge of the flexible filter cloth 5 in the guide groove and pressing the edge by the press wheel.

[0032] Through the above technical solution, the sewage is first filtered by the grid filter 12 to filter large pieces of garbage such as plastic bottles. Then the sewage is filtered by the flexible filter cloth 5, and the filtered sewage enters the sedimentation tank 2 for sedimentation, so that the solid particles in the sewage sink to the bottom of the sedimentation tank 2, and the liquid flows into the aeration tank 3, which further processes the solid particles with light weight in the sewage. Then it enters the ultraviolet exposure tank 4 for sterilization treatment. The use of the flexible filter cloth 5 can process small solid particles in the sewage, thereby reducing the content of solid particles in the sewage, and increasing the processing speed of the sewage in the sedimentation tank 2 and the aeration tank 3, thereby increasing the overall processing speed of the sewage. In addition, the support surface formed on the flexible filter cloth 5 can not only filter the dirt but also remove the dirt, thereby saving space, reducing cost and improving efficiency compared with the traditional scheme of setting multiple sedimentation tanks 2.

[0033] In one specific scheme, the flexible filter cloth 5 forms a plurality of bending portions 53 in the width direction to form a plurality of concave grooves 54 on the flexible filter cloth 5. In this scheme, the bending portions 53 on the flexible filter cloth 5 are formed by bending the flexible filter cloth 5 multiple times. The use of the bending portions 53 can increase the area of the flexible filter cloth 5 in the sewage for filtering the sewage, and the concave grooves 54 can accommodate the dirt filtered out of the sewage, so that the support surface can carry more dirt outwards.

[0034] In one specific scheme, the connecting barrier 52 forms an accommodation chamber 55 on the flexible filter cloth 5, and a plurality of accommodation chambers 55 are provided. Each of the plurality of accommodation chambers 55 has an opening 51, and the opening 51 is arranged in the same direction as the conveying direction of the flexible filter cloth 5. The accommodation chamber 55 is arranged to directly accommodate the dirt in the sewage, thereby preventing the dirt from falling off the flexible filter cloth 5, so that the dirt can be carried out of the sewage with the flexible filter cloth 5. In addition, the opening 51 of the accommodation chamber 55 is arranged in the same direction as the conveying direction of the flexible filter cloth 5, that is, upward when the flexible filter cloth 5 is conveyed outward in the sewage, thereby preventing the dirt from falling off.

[0035] In some embodiments, the guide 7 is also used to make the flexible filter cloth 5 at least partially transport downward after leaving the water surface. More specifically, a collection tank is arranged above the liquid surface of the sewage, wherein the projection of the downwardly transporting portion of the flexible filter cloth 5 on the liquid surface is completely located inside the projection of the collection tank on the liquid surface. Therefore, the opening 51 of the containing chamber 55 is made to face downward by making the flexible filter cloth 5 transport downward, so that the dirt contained in the containing chamber 55 is poured outwards and into the collection tank, thereby achieving self-cleaning of the flexible filter cloth 5.

[0036] In some embodiments, the municipal sewage treatment system further comprises a storage tank 8. A storage chamber is formed in the storage tank 8, and an inlet and an outlet are formed in the storage tank 8 and communicate with the storage chamber. The inlet is used for feeding the flexible filter cloth 5 into the storage chamber, and the outlet is used for discharging the flexible filter cloth 5 in the storage chamber. A stopper 81 is arranged at the outlet and used to stop the flexible filter cloth 5 from being discharged outwards from the storage chamber. In this embodiment, the stopper 81 comprises two pressure rollers, and a motor is arranged on each pressure roller. When the motor controls the pressure rollers to rotate, the pressure rollers transport the flexible filter cloth 5, and when the motor controls the pressure rollers to stop, the flexible filter cloth 5 is pressed by the two pressure rollers, so that the flexible filter cloth 5 stops transporting. When the flexible filter cloth 5 stops transporting, the flexible filter cloth 5 cannot be discharged outwards from the outlet. A feeder 82 is arranged at the inlet and used to continuously or stop feeding the flexible filter cloth 5 into the storage chamber. In this embodiment, the feeder 82 can be the same as the stopper 81 and also comprises two pressure rollers and a motor. Therefore, the flexible filter cloth 5 cannot be discharged outwards from the storage chamber, and the flexible filter cloth 5 is continuously fed into the storage chamber, so that the flexible filter cloth 5 in the storage chamber is accumulated. The transporting of the flexible filter cloth 5 in the sewage can ensure the filtering effect of the sewage and avoid the flexible filter cloth 5 from being blocked to affect the flow of the sewage. Therefore, the flexible filter cloth 5 is accumulated in the storage chamber while the flexible filter cloth 5 is transported in the sewage.

[0037] The drying piece is used for drying the flexible filter cloth 5 in the storage chamber. The drying piece adopts a drying device such as a hair dryer, and the drying process adopts normal-temperature air drying. The purpose is to evaporate the water on the flexible filter cloth 5, so that only stains exist on the flexible filter cloth 5. Since the stains adhere to the flexible filter cloth 5 after the water is dried, the stains are easy to be cleaned. Therefore, the outlet is further provided with a scraping part 83 used for abutting against both sides of the flexible filter cloth 5. The scraping part 83 is a plate body, and the scraping part 83 is in contact with the flexible filter cloth 5, so that the stains on the flexible filter cloth 5 are cleaned. After the flexible filter cloth 5 is cleaned of the stains and is then wound, the quality of the wound flexible filter cloth 5 is ensured, the flexible filter cloth 5 is convenient to clean in the later period, and the wound flexible filter cloth 5 is light in weight and is convenient to transport. In another scheme of the embodiment, the drying piece can also be a heating pipe, and the water on the flexible filter cloth 5 is dried by heating. In another scheme of the stopper 81, the stopper 81 can also be a pneumatic clamping jaw. The pneumatic clamping jaw clamps the flexible filter cloth 5, so that the flexible filter cloth 5 is stopped and is output from the storage chamber.

[0038] Specifically, the storage chamber is provided with a bearing body 84 with a hollow region and a driving piece 85 used for driving the bearing body 84 to rotate around at least a fixed axis from a first rotating position to a second rotating position. The driving piece 85 adopts a driving motor. When the bearing body 84 is located at the first rotating position, the bearing body 84 is obliquely arranged in the storage chamber relative to the flexible filter cloth 5 in the storage box 8. When the bearing body 84 is located at the second rotating position, the bearing body 84 is horizontally arranged in the storage chamber relative to the flexible filter cloth 5 in the storage box 8. The driving piece 85 drives the bearing body 84 to switch between the first rotating position and the second rotating position, so that the bearing body 84 is continuously in contact with and separated from the flexible filter cloth 5 in the storage chamber, that is, the flexible filter cloth 5 is pressed, which is beneficial to extruding the water in the flexible filter cloth 5 outward and increases the drying or drying speed of the flexible filter cloth 5. In addition, after the flexible filter cloth 5 is dried, the extrusion of the bearing body 84 to the flexible filter cloth 5 can change the shape of the flexible filter cloth 5 continuously, so that the stains adhered to the flexible filter cloth 5 fall off the flexible filter cloth 5, and the cleaning effect of the flexible filter cloth 5 is increased.

[0039] More specifically, the storage box 8 is located close to the ground, and a drawer is further arranged in the storage box 8 and located below the bearing body 84. That is, when the bearing body 84 is located at the first rotating position or the second rotating position, the drawer is located below the bearing body 84. The drawer can be drawn out relative to the storage box 8, so that the stains on the flexible filter cloth 5 directly fall into the drawer and are convenient to collect. Since the storage box 8 is located close to the ground, the drawer is convenient to be removed by workers in the subsequent period and is convenient to be centrally treated.

[0040] More specifically, the drawer contains water, and the stains fall into the water in the drawer, thereby preventing the stains from floating and facilitating the collection of the stains.

[0041] One of the solutions for the outlet and the inlet is that both of them are located in the upper part of the storage chamber, and the fixed axis is located in the upper part of the storage chamber. When the outlet and the inlet are both in the upper part of the storage chamber, the flexible filter cloth 5 can be accommodated in the storage chamber more. Thus, more flexible filter cloths 5 can be subjected to the drying process.

[0042] Another solution for the outlet and the inlet is that the inlet is located at the top of the storage tank 8, and the outlet is located at the side of the lower part of the storage tank 8. Thus, the conveying direction of the flexible filter cloth 5 in the storage tank 8 is vertical downward conveying. Therefore, when the flexible filter cloth 5 is stopped from conveying out of the storage tank 8 by the stopper 81, the flexible filter cloth 5 can be better stacked inside the storage chamber, so that the storage chamber can accommodate more flexible filter cloths 5, and thus more flexible filter cloths 5 can be subjected to the stain cleaning process at the same time. At this time, the opening 51 of the accommodating chamber 55 on the flexible filter cloth 5 faces downward, and when the flexible filter cloth 5 is subjected to the cleaning process, the dried stains in the accommodating chamber 55 can also be better discharged outward due to the downward opening 51 of the accommodating chamber 55. In the storage tank 8, a pressure roller is also arranged to guide the flexible filter cloth 5 to enter the storage tank 8 from the inlet and to discharge the storage tank 8 from the outlet.

[0043] One of the solutions for the scraping part 83 is a plate body fixed with the storage tank 8 at the outlet. Another solution for the scraping part 83 is a plate body arranged on the inner wall surface of the outlet. In other solutions for the scraping part 83, since the flexible filter cloth 5 is outputted from the outlet, the opening 51 of the accommodating chamber 55 is outputted outward against the scraping part 83, the scraping part 83 is easy to contact with the opening 51, the opening 51 is lifted, and the stability of the output of the flexible filter cloth 5 is affected. Therefore, in the present solution, the scraping part 83 adopts a cylindrical rod, and the arc outer wall surface of the cylindrical rod is used to press the opening 51, so as to better ensure the stability of the conveying of the flexible filter cloth 5.

[0044] In addition, in one of the schemes of the carrier 84, the carrier 84 can be a grid, and the grid itself forms the hollowed region. In another scheme of the carrier 84, the carrier 84 is composed of a plurality of horizontal bars and a plurality of vertical bars intersecting together, and the elastic structures 841 are arranged on part of the horizontal bars and part of the vertical bars. The elastic structures 841 can be elastic rubber, and a plurality of protrusions and a plurality of recesses are formed on the elastic structures 841. Therefore, when the carrier 84 extrudes the flexible filter cloth 5, the flexible filter cloth 5 can be deformed more. Then, after the flexible filter cloth 5 is dried, the stains in the sewage are mainly large sludge, so that the sludge is also dried. The dried sludge is agglomerated on the flexible filter cloth 5. When the sludge is impacted by the outside, the sludge is broken into smaller particles, so that the sludge is separated from the flexible filter cloth 5. The deformation of the flexible filter cloth 5 also causes the dried sludge to be separated. Increasing the deformation degree of the flexible filter cloth 5 can make the sludge be separated more thoroughly.

[0045] In some embodiments, the municipal sewage treatment system further comprises a cleaning member 9. The cleaning member 9 is used to clean the flexible filter cloth 5 discharged outwardly from the outlet. The cleaning member 9 comprises a cleaning box 91, a profiling structure 92, a water injection structure 93, and a water drainage structure 94. The profiling structure 92 forms a profiling surface abutting against the flexible filter cloth 5 and elastically deforming the flexible filter cloth 5. A plurality of discharge ports are formed on the profiling surface. The profiling structure 92 is arranged in the cleaning box 91. The water injection structure 93 is used to inject water into the discharge ports. The water drainage structure 94 is located on the side of the flexible filter cloth 5 away from the profiling surface. In this embodiment, the profiling structure 92 can be a block abutting against the flexible filter cloth 5. The profiling structure 92 elastically deforms the flexible filter cloth 5, so that the filter holes of the flexible filter cloth 5 are enlarged. Therefore, the sludge or other stains adhered to the flexible filter cloth 5 can be more easily removed. In addition, the water injection structure 93 can be a water injection pump connected to a water source. The water drainage structure 94 can be a water drainage pump connected to a sewage tank or a sewage pool. The water injection pump injects water from the plurality of discharge ports formed on the profiling surface, so that the water is directly discharged outwardly on the profiling surface. The water penetrates through the flexible filter cloth 5, and the impact force of the water and the enlargement of the filter holes of the flexible filter cloth 5 make the sludge or other stains adhered to the flexible filter cloth 5 more easily and more thoroughly separated from the flexible filter cloth 5.

[0046] Specifically, the part of the flexible filter cloth 5 in contact with the profiled surface is transported downward in the conveying direction. The cleaning box 91 is also provided with a pressure roller, which guides the flexible filter cloth 5 so that the part of the flexible filter cloth 5 in contact with the profiled surface is transported downward, i.e., the opening 51 of the accommodation chamber 55 faces downward. When the flexible filter cloth 5 is cleaned by water flushing, the water can pass through the flexible filter cloth 5 to clean more dirt on the flexible filter cloth 5. At the same time, the flexible filter cloth 5 allows the water to enter the accommodation chamber 55, and then part of the water flows out of the opening 51 of the accommodation chamber 55. Since the opening 51 of the accommodation chamber 55 faces downward, the water carrying the dirt is discharged from the opening 51 of the accommodation chamber 55. Therefore, the opening 51 of the accommodation chamber 55 is cleaned to prevent the accumulation of sludge or other dirt. The drainage direction of the drain is inclined downward. The drainage direction of the drain is determined by the opening direction of the drain. The inclined downward drainage direction of the drain can make the water more easily discharged from the opening 51 of the accommodation chamber 55.

[0047] More specifically, the profiled surface is a spherical surface, which can make the flexible filter cloth 5 more smoothly contact and slide with the profiled surface.

[0048] In another embodiment, the cleaning box 91 is also provided with a rotating member 95, which drives the profiled structure 92 to rotate. The rotating member 95 adopts a motor and a set of transmission gears. The profiled structure 92 is formed with a connecting section, which is connected to a rotating joint. The rotating joint is connected to a water injection pump. Therefore, the water injection pump can inject water into the drain, and the profiled structure 92 can rotate. The drain is in communication with the water injection pump. Therefore, the rotation of the profiled structure 92 can make the plurality of drains rotate, so that the drains can drain and clean more positions of the flexible filter cloth 5. Specifically, the profiled surface of the profiled structure 92 has a plurality of protruding portions and a plurality of recessed portions. Therefore, the profiled structure 92 can make the flexible filter cloth 5 vibrate relative to the profiled structure 92 by using the recesses and protrusions. Thus, the dirt on the flexible filter cloth 5 can be better removed by inertia.

[0049] In some embodiments, the flexible filter cloth 5 is provided with quick release members at both ends. The two quick release members combine to fix one section of the flexible filter cloth 5 with another section of the flexible filter cloth 5. In actual use, the winding member 61 winds up the flexible filter cloth 5. However, after the flexible filter cloth 5 on the filter cloth roller 6 is completely unwound, the filter cloth roller 6 needs to be replaced. Directly replacing the filter cloth roller 6 will cause the flexible filter cloth 5 to be rewound on the guide roller, which makes the replacement process too complicated. Therefore, the quick release members are provided. After the filter cloth roller 6 is completely unwound, a new filter cloth roller 6 is directly placed at the corresponding position. The flexible filter cloth 5 on the new filter cloth roller 6 is connected to the flexible filter cloth 5 on the old filter cloth roller 6 by the quick release members. Thus, the old filter cloth roller 6 itself is directly replaced, which makes the replacement process simple and fast.

[0050] In a specific embodiment, the quick release member comprises a first abutting portion 56, a second abutting portion 57, and a connecting portion 58 connecting the first abutting portion 56 and the second abutting portion 57, and an abutting slot is formed between the first abutting portion 56 and the second abutting portion 57; and a locking member 59 is arranged in the abutting slot. The abutting slot is used for inserting the first abutting portion 56 or the second abutting portion 57. When the first abutting portion 56 or the second abutting portion 57 is inserted into the abutting slot, the locking member 59 locks the first abutting portion 56 or the second abutting portion 57. The first abutting portion 56, the second abutting portion 57, and the connecting portion 58 are all plate bodies made of flexible rubber material. The locking member 59 is a clamping hole formed on the first abutting portion 56 and the second abutting portion 57. The clamping hole is a through hole. The first abutting portion 56 and the second abutting portion 57 are both formed with a clamping portion capable of being inserted into the clamping hole. When the first abutting portion 56 or the second abutting portion 57 is inserted into the abutting slot, the clamping portion is inserted into the clamping hole, so that the two quick release members are abutted together. One of the quick release members is arranged at the end of one flexible filter cloth 5, and the other quick release member is arranged at the end of the other flexible filter cloth 5, so that the two flexible filter cloths 5 are connected together. The first abutting portion 56 and the second abutting portion 57 are arranged so that the two parts of the flexible filter cloth 5 can be abutted together regardless of how the flexible filter cloth 5 is installed on the filter cloth roller 6.

[0051] More specifically, the clamping portion is made of flexible material, and a slope and a clamping surface are formed on the clamping portion. During the process of inserting the first abutting portion or the second abutting portion into the abutting slot, the slope is close to the insertion slot, and the clamping surface is away from the insertion slot. When the first abutting portion or the second abutting portion is inserted into the abutting slot, the clamping surface abuts against the clamping hole, so that when the two flexible filter cloths 5 are subjected to a pulling force, the clamping surface and the clamping hole abut against each other, which makes the two flexible filter cloths 5 unable to be separated. When it is needed to separate the two flexible filter cloths 5, the two quick release members are moved close to each other until the clamping portion is separated from the clamping hole, and then the two quick release members are moved laterally relative to each other until the two quick release members are separated from each other.

[0052] Some other embodiments provide a sewage treatment method using the sewage treatment system of at least one of the above embodiments. The sewage treatment method comprises the following steps: sequentially making the sewage flow through the grid filter 12, the cloth bag filter, the sedimentation tank 2, the aeration tank 3 and the ultraviolet exposure tank 4; the method for making the sewage flow through the cloth bag filter comprises: arranging the flexible filter cloth 5 forming filter holes for the sewage to flow through in the sewage, the flexible filter cloth 5 having a plurality of connecting blocking parts 52 of repelling surfaces of the flexible filter cloth 5; arranging the filter cloth roller 6 with the flexible filter cloth 5 wound thereon above the water surface of the sewage; using the winding member 61 to wind the flexible filter cloth 5 on the filter cloth roller 6 into the winding member 61; moving the flexible filter cloth 5 in the sewage along a first preset track and at least partially outside the sewage along a second preset track by the guide member 7; the first preset track makes the flexible filter cloth 5 be inclined to the water surface of the sewage, and when the flexible filter cloth 5 is transported away from the sewage, the repelling surface is located at the side of the flexible filter cloth 5 close to the sewage; and forming an injection port on the sedimentation tank 2, and the flexible filter cloth 5 is in contact with the inner wall of the injection port.

[0053] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A municipal wastewater treatment system, characterized in that, include: The wastewater flows through sequentially through a grid filter, a sedimentation tank, an aeration tank, and an ultraviolet exposure tank. A bag filter is provided between the grid filter and the sedimentation tank; The filter bag includes: A flexible filter cloth, forming filter holes through which sewage flows and multiple connecting baffles having a support surface that repels the flexible filter cloth; The filter cloth roller is positioned above the surface of the wastewater. A winding member is used to wind up the flexible filter cloth on the filter cloth roller into the winding member; A guide is provided for moving the flexible filter cloth along a first preset trajectory in the wastewater and along a second preset trajectory at least partially outside the wastewater; the first preset trajectory causes the flexible filter cloth to tilt relative to the water surface of the wastewater, and when the flexible filter cloth is conveyed in a direction away from the wastewater, the support surface is located on the side of the flexible filter cloth closer to the wastewater; An injection port is formed on the sedimentation tank, and the flexible filter cloth is in contact with the inner wall of the injection port.

2. A municipal wastewater treatment system according to claim 1, characterized in that: The flexible filter cloth has multiple bends along its width to create multiple slits.

3. A municipal wastewater treatment system according to claim 1 or 2, characterized in that: The connecting baffle forms a receiving chamber on the flexible filter cloth, and multiple receiving chambers are provided; each of the multiple receiving chambers has an opening, and the opening direction matches the conveying direction of the flexible filter cloth.

4. A municipal wastewater treatment system according to claim 1 or 2, characterized in that: The flexible filter cloth is provided with quick-release parts at both ends, and the two quick-release parts are combined to fix one section of the flexible filter cloth to the other section of the flexible filter cloth.

5. A municipal wastewater treatment system according to claim 4, characterized in that: The quick-release component includes: a first docking part, a second docking part, and a connecting part that connects the first docking part and the second docking part, wherein a docking groove is formed between the first docking part and the second docking part; A locking component is provided in the docking groove; the docking groove is used for the insertion of the first docking part or the second docking part. When the first docking part or the second docking part is inserted into the docking groove, the locking member locks the first docking part or the second docking part.

6. A municipal wastewater treatment system according to claim 1 or 2, characterized in that: The municipal wastewater treatment system also includes a storage tank; the storage tank forms a storage chamber and an inlet and an outlet connected to the storage chamber; the inlet is for feeding flexible filter cloth into the storage chamber, and the outlet is for discharging the flexible filter cloth from the storage chamber; The outlet is provided with a stop device to prevent the flexible filter cloth from being discharged outward from the storage chamber; The inlet is provided with a feeding device for continuously or stopping the flexible filter cloth from being fed into the storage chamber. The storage chamber is equipped with a drying element for drying the flexible filter cloth inside the storage chamber; The outlet is also provided with a scraper for contacting the two sides of the flexible filter cloth.

7. A municipal wastewater treatment system according to claim 6, characterized in that: The storage chamber is provided with a carrier having a hollow area and a drive component for driving the carrier to rotate from a first rotation position to a second rotation position around at least one fixed axis. When the carrier is in the first rotational position, the carrier is obliquely placed in the storage chamber relative to the flexible filter cloth in the storage tank; when the carrier is in the second rotational position, the carrier is horizontally placed in the storage chamber relative to the flexible filter cloth in the storage tank.

8. A municipal wastewater treatment system according to claim 7, characterized in that: The municipal wastewater treatment system also includes a cleaning component, which is used to clean the flexible filter cloth discharged outward from the outlet; The cleaning components include: a cleaning box, a molding structure, a water injection structure, and a drainage structure; The forming structure forms a forming surface that abuts against the flexible filter cloth and causes the flexible filter cloth to elastically deform; the forming structure forms a plurality of outlets on the forming surface; The molding structure is installed in the cleaning box, the water injection structure is used to inject water into the outlet, and the drainage structure is located on the side of the flexible filter cloth opposite to the molding surface.

9. A municipal wastewater treatment system according to claim 8, characterized in that: The portion of the flexible filter cloth in contact with the molding surface is conveyed downwards; the drainage direction of the outlet is inclined downwards.

10. A method for treating municipal wastewater, characterized in that, Includes the following steps: The wastewater flows sequentially through the grid filter, bag filter, sedimentation tank, aeration tank, and ultraviolet exposure tank. Methods for wastewater to flow through bag filters include: A flexible filter cloth with filter holes for wastewater to flow through is placed in the wastewater. The flexible filter cloth has multiple connecting baffles that are opposed to the flexible filter cloth surface. The filter cloth roller wrapped with flexible filter cloth is placed above the water surface of the sewage; The flexible filter cloth on the filter cloth roller is wound into the winding device using a winding device; The flexible filter cloth is moved along a first preset trajectory in the sewage and at least partially outside the sewage along a second preset trajectory by a guide; the first preset trajectory causes the flexible filter cloth to be inclined with the water surface of the sewage, and when the flexible filter cloth is transported in a direction away from the sewage, the support surface is located on the side of the flexible filter cloth closer to the sewage; An injection port is formed on the sedimentation tank, and the flexible filter cloth is in contact with the inner wall of the injection port.

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