Sludge screening device for sequencing batch aerobic granular sludge technology

Abstract

The invention discloses a sludge screening device of a sequencing batch aerobic granular sludge technology, and relates to the technical field of sewage treatment.The sludge screening device comprises a sewage treatment tank, a sludge sediment bearing mechanism, a through groove sealing control mechanism, a middle-layer sludge removing mechanism, an arc groove gap sealing mechanism and an upper-layer sludge discharging mechanism; the top of the outer side of the sewage treatment tank is connected with a lifting beam through a supporting assembly, and the middle of the lifting beam is rotationally connected with the top of a vertical lifting rotary drum. According to the sewage treatment tank, flocculent sludge and water on the upper layer can be extracted, precipitated light sludge on the upper layer is removed by virtue of the sludge removal mechanism on the middle layer, aerobic granular sludge with good settling performance on the bottom layer is screened and left, microbial communities in the sewage treatment tank are optimized, and the sewage treatment effect of the aerobic granular sludge is favorably improved.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a sludge screening device using a sequencing batch aerobic granular sludge technology. Background Art

[0002] Aerobic granular sludge is a granular sludge formed by spontaneous aggregation of microorganisms under aerobic conditions, which achieves efficient removal of pollutants from wastewater. Compared with traditional flocculent activated sludge, aerobic granular sludge has larger sludge particle size, faster settling rate and more compact layered structure. It integrates aerobic, anoxic and anaerobic microorganisms, making the aerobic granular sludge process feasible for simultaneous removal of nitrogen and phosphorus. Among them, aerobic granular sludge with smooth surface, large particle size and good settling performance can withstand higher organic loads and is a high-quality microbial community. It should be retained in the reactor. Light, flocculent sludge has low activity and poor settling performance and should be discharged from the reactor. The existing sequencing batch aerobic granular sludge reactor does not have a sludge screening device and cannot remove the light sludge on the upper layer, resulting in the light sludge remaining in the reactor, occupying the resources of high-quality aerobic granular sludge and affecting the treatment effect of aerobic granular sludge on sewage. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a sludge screening device of sequencing batch aerobic granular sludge technology. After the upper clean water in the sewage treatment tank is discharged through the annular overflow weir and the clean water discharge pipe, the upper flocculent sludge and water can be extracted and the sludge can be separated through a cyclone. The precipitated light sludge in the upper layer can be removed with the help of the middle layer sludge removal mechanism, and the aerobic granular sludge with good sedimentation performance in the bottom layer can be screened to optimize the microbial community in the sewage treatment tank, which is conducive to improving the treatment effect of aerobic granular sludge on sewage, and can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a sludge screening device for sequencing batch aerobic granular sludge technology, comprising a sewage treatment tank, and further comprising: The sludge sedimentation support mechanism includes a support tray. The outer top of the sewage treatment tank is connected to a lifting beam through a lifting assembly, and the middle part of the lifting beam is rotatably connected to the top of the vertical lifting drum. The outer peripheral side of the bottom of the lifting drum is fixedly connected to the middle part of a circular cover. The circular cover is connected to the top of the round seat. The outer side of the round seat is fixedly sleeved with a support tray. The support tray is provided with a plurality of rectangular through slots in a circular array. The through slot closing control mechanism is installed on the lifting drum and the round seat; The middle layer sludge removal mechanism is installed on the side of the sewage treatment tank, and an arc groove gap sealing mechanism is installed on the outside of the sewage treatment tank at a position corresponding to the middle layer sludge removal mechanism; The upper sludge discharge mechanism is installed on the outside of the sewage treatment tank.

[0005] An aeration device is installed at the bottom of the sewage treatment tank to aerate the bottom of the sewage treatment tank and promote the growth of aerobic granular sludge in the sewage treatment tank. An annular overflow weir is set at the top of the sewage treatment tank. The annular overflow weir is connected to one end of the clean water discharge pipe, and the other end of the clean water discharge pipe extends to the outside of the sewage treatment tank. A hybrid power component is connected to the top of the lifting drum. The hybrid power component is used to drive the lifting drum to rotate, and the lifting drum drives the support tray to rotate in the sewage treatment tank. With the help of the through-channel closing control mechanism, the aerobic granular sludge and newly added sewage in the sewage treatment tank can be stirred to promote the full reaction of aerobic granular sludge and newly added sewage. The lifting component drives the lifting drum, the support tray and the through-channel closing control mechanism to move up and down in the sewage treatment tank through the lifting beam. By changing the height of the through slot closing control mechanism in the sewage treatment tank, the aerobic granular sludge and the newly added sewage in the sewage treatment tank can be fully stirred. During stirring, continuous aeration is carried out with the help of the aeration device to promote the rapid growth and formation of aerobic granular sludge. Then the hybrid power component and the aeration device stop working, and the lifting component drives the lifting drum, the support tray and the through slot closing control mechanism to the lowest position in the sewage treatment tank. The through slot closing control mechanism works to close the rectangular through slot on the support tray, and waits for the aerobic granular sludge to settle. Since the rectangular through slot on the support tray has been closed, the high-quality aerobic granular sludge with good settling performance first settles to the upper side of the support tray to form a thick high-quality aerobic granular sludge sedimentation layer, and then the light aerobic granular sludge with general settling performance settles. , and finally the flocculent sludge settles. The upper layer in the sewage treatment tank is clean water. The lifting component drives the lifting drum, the support tray and the through-trough closing control mechanism to move upward in the sewage treatment tank through the lifting beam. At the same time, the sewage to be treated is added to the space below the support tray in the sewage treatment tank. Due to the thick and high-quality aerobic granular sludge sedimentation layer, the sewage below the support tray will not be mixed with the clean water on the upper layer of the sewage treatment tank. At this time, the clean water on the upper layer of the sewage treatment tank enters the annular overflow weir and is then discharged through the clean water discharge pipe until the clean water on the upper layer is completely discharged. The upper sludge discharge mechanism works to pump away the flocculent sludge mixed with water for easy flow on the upper layer, and then the middle sludge removal mechanism works to push open the arc groove gap sealing mechanism to remove the lightweight sludge with generally good sedimentation performance. The aerobic granular sludge is removed and discharged from the sewage treatment tank, leaving the high-quality aerobic granular sludge sedimentation layer on the upper side of the tray. The through slot closing control mechanism opens the rectangular through slot on the tray, and the hybrid power component, aeration device and lifting component start working, and continue to add sewage to be treated into the sewage treatment tank. The sewage in the sewage treatment tank is stirred by the tray and the through slot closing control mechanism, so that the high-quality aerobic granular sludge sedimentation layer is mixed with the sewage, which promotes the formation of more aerobic granular sludge. The aerobic granular sludge treats the sewage. The sewage treatment tank serves as the main body of the sequencing batch aerobic granular sludge reactor. It treats the sewage through the sequencing batch sewage treatment process. After the sewage is treated, the flocculent sludge on the upper layer can be pumped away, and the lightweight aerobic granular sludge with general sedimentation performance can be removed and discharged.Screening and retaining aerobic granular sludge with good settling performance is beneficial to improving the efficiency and effect of sewage treatment.

[0006] Furthermore, the through-slot closure control mechanism includes a rotation control component, a transmission component, and a through-slot closure component. The transmission component is installed inside the lifting drum and the round seat. The top of the transmission component is connected to the rotation control component. The through-slot closure component is installed in the rectangular through-slot, and the through-slot closure component is connected to the transmission component. The rotation control component drives the through-slot closure component to work through the transmission component, allowing the through-slot closure component to open or close the rectangular through-slot. When the through-slot closure component opens the rectangular through-slot, the through-slot closure component itself can serve as a stirring blade, and can stir the sewage in the sewage treatment tank as the support tray rotates. When the through-slot closure component closes the rectangular through-slot, aerobic granular sludge can settle on the upper side of the support tray without falling through the rectangular through-slot to the bottom of the support tray. The support tray can support the settled aerobic granular sludge layer to move upward, and discharge the upper clean water through the annular overflow weir.

[0007] Furthermore, the through-slot sealing assembly includes a sealing bearing, a control shaft, and a sealing movable plate. The side of the round seat corresponding to the middle position of each rectangular through-slot is rotatably connected to a control shaft via a sealing bearing. One end of the control shaft located in the rectangular through-slot is fixedly connected to the center of the end of the sealing movable plate. The control shaft can rotate relative to the round seat through the sealing bearing, thereby driving the sealing movable plate to move in the rectangular through-slot. When the sealing movable plate is in a horizontal state in the rectangular through-slot, the sealing movable plate closes the rectangular through-slot. At this time, aerobic granular sludge can be deposited on the upper side of the support tray. Even if there is a gap between the sealing movable plate and the rectangular through-slot, the deposited aerobic granular sludge will also block the gap. When the sealing movable plate is in a vertical distribution state in the rectangular through-slot, the sealing movable plate opens the rectangular through-slot. The sealing movable plate can act as a blade to stir the sewage in the sewage treatment tank as the support tray rotates. At the same time, the sewage in the upper and lower layers of the support tray can exchange and flow through the rectangular through-slot, and the air blown out by the aeration device at the bottom of the sewage treatment tank can also overflow upward through the rectangular through-slot.

[0008] Furthermore, the transmission assembly includes a control drum, an end gear, and a control gear. The control drum is rotatably mounted on the inner side of the lifting drum. The bottom end of the control drum extends through a through hole at the bottom of the round seat to the underside of the round seat. The control drum is located at the inner bottom of the round seat and is fixedly sleeved with an end gear. Each control shaft is fixedly connected to a control gear at one end within the round seat. The end gears are meshed with each end gear. The top of the control drum is connected to the top outer side of the lifting drum via a rotation control assembly. The rotation control assembly is used to drive the control drum to rotate relative to the lifting drum, thereby driving the end gears to rotate. The end gears can synchronously drive the rotation of each control shaft through each control gear.

[0009] Furthermore, the middle-layer sludge removal mechanism includes a removal arc groove, a rotating shaft, a removal motor, a motor bracket and an arc control panel. A removal arc groove is opened on the side of the sewage treatment tank. One end of the removal arc groove is rotatably connected to a vertical rotating shaft. The rotating shaft is located on one side of the removal arc groove and is fixedly connected to one end of the arc control panel. The top end of the rotating shaft extends to the upper side of the sewage treatment tank and is fixedly connected to the output shaft of the removal motor. The removal motor is installed on the top of the sewage treatment tank through the motor bracket. The lifting component drives the lifting drum, the supporting tray and the through-groove closing control mechanism to move upward in the sewage treatment tank through the lifting beam. After the upper clean water is discharged through the annular overflow weir and the clean water discharge pipe, the upper sludge discharge mechanism works to extract the upper flocculent sludge mixed with water for easy flow, and then the removal motor works to drive the rotating shaft to rotate clockwise. The arc control plate extends into the interior of the sewage treatment tank as the rotating shaft rotates clockwise, and at the same time opens the removal arc groove. The hybrid power component drives the lifting drum and the supporting tray to rotate counterclockwise. The light aerobic granular sludge with general sedimentation performance encounters the outer arc surface of the arc control plate and is guided by the outer arc surface of the arc control plate to be discharged from the sewage treatment tank from the removal arc groove, completing the removal of the light aerobic granular sludge with general sedimentation performance. The removal motor works to drive the rotating shaft to rotate counterclockwise, allowing the arc control plate to re-close the removal arc groove.

[0010] Furthermore, the intermediate sludge removal mechanism further includes an intermediate sludge receiving box, a collection hopper, and a transfer pipeline. The intermediate sludge receiving box is fixedly connected to the outside of the sewage treatment tank, below the removal arc trough. The bottom of the intermediate sludge receiving box is fixedly connected to the top of the collection hopper, and the bottom of the collection hopper is connected to the transfer pipeline. Lightweight aerobic granular sludge with moderate settling properties discharged from the removal arc trough falls into the intermediate sludge receiving box, is collected by the collection hopper, and then can be transferred through the transfer pipeline.

[0011] Furthermore, the arc groove gap sealing mechanism includes a sealing arc plate, and a sealing arc plate is provided on the outside of the sewage treatment tank at a position corresponding to the removed arc groove, and the top of the sealing arc plate is fixedly connected to two sliding sleeves, and two horizontal sliding columns are slidably connected in the two sliding sleeves, one end of the two sliding columns is fixedly connected to the outside of the sewage treatment tank, and the other end of the two sliding columns is threadedly connected to a limiting nut, and the part of the limiting nut located between the limiting nut and the sliding sleeve is sleeved with a compression spring, and an arc groove is provided at the end of the removed arc groove close to the rotating shaft, and an arc expansion rod is fixedly connected to the position of the arc groove at the end of the arc control plate, and a roller is rotatably installed on the end of the arc expansion rod away from the arc control plate, and an arc sealing gasket is provided on the side of the sealing arc plate close to the sewage treatment tank, and an anti-wear notch is provided in the area of the arc sealing gasket corresponding to the arc groove. When the arc control plate rotates clockwise with the shaft and extends into the interior of the sewage treatment tank, the arc expansion rod extends from the arc groove, and the roller at the end of the arc expansion rod pushes the sealing arc plate in the direction away from the sewage treatment tank. At this time, the sealing arc plate slides along the sliding column through the sliding sleeve to compress the compression spring. During this period, the roller rolls in contact with the inner arc surface of the sealing arc plate through the anti-wear notch to reduce the friction on the sealing arc plate. Since the sealing arc plate is away from the sewage treatment tank, after the arc groove is opened, the light aerobic granular pollutants with general sedimentation performance are The mud can fall smoothly into the middle sludge receiving box through the removal arc groove. When the arc control plate moves counterclockwise with the rotating shaft to close the removal arc groove, the arc expansion rod also enters the arc groove. The arc expansion rod no longer pushes the sealing arc plate through the roller. The compression spring resets and extends, pushing the sealing arc plate along the sliding column to approach the outside of the sewage treatment tank again. The gap between the removal arc groove and the arc control plate is sealed with the help of a rubber arc sealing gasket to prevent sewage from leaking through the gap here when sewage is treated in the sewage treatment tank.

[0012] Furthermore, the upper sludge discharge mechanism includes a sludge pump, a lifting platform, a cyclone and a sludge discharge height control component. Two vertical slide rails are fixedly connected to the outer side of the top of the sewage treatment tank. Two sliders are slidably connected in the two slide rails. Both sliders are fixedly connected to the side of the lifting platform. The cyclone and the sludge pump are respectively installed on the lifting platform. The water outlet of the sludge pump is connected to the inlet of the cyclone. The water inlet of the sludge pump is fixedly connected to one end of the arched discharge pipe. The other end of the arched discharge pipe extends to the inner side of the top of the sewage treatment tank. The arched discharge pipe is a hard pipe. The bottom of the lifting platform is connected to the sludge discharge height control component. The sludge discharge height control component is used to drive the lifting platform to move up and down along the slide rail, so that the height of the end of the arch discharge pipe in the sewage treatment tank can be adjusted so that one end of the arch discharge pipe in the sewage treatment tank is just at the bottom of the flocculent sludge. The sludge pump works by sucking out the flocculent sludge and mixed water with the help of the arch discharge pipe, and then sends them into the cyclone. The flocculent sludge flows out from the bottom flow port of the cyclone, and the separated water is discharged through the overflow port of the cyclone, completing the discharge and separation of the flocculent sludge. Since the mixture of flocculent sludge and sewage is still fluid, it can be discharged with the help of the arch discharge pipe, while the light aerobic granular sludge with general sedimentation performance has general fluidity, so it is removed with the help of the middle layer sludge removal mechanism.

[0013] Furthermore, the system also includes a tray lift limit mechanism, which includes a U-shaped frame, a lift height control assembly, and a limit switch. The top of the sewage treatment tank is mounted with a U-shaped frame via the lift height control assembly. The U-shaped frame is located above the end of the lifting beam, and a limit switch is installed in the middle of the lifting beam at a position corresponding to the lifting beam. The lift height control assembly can adjust the height of the U-shaped frame and the limit switch. When the lifting assembly drives the lifting beam and the tray to lift and discharge the upper layer of clean water, the lifting beam gradually approaches the limit switch. When the upper layer of clean water is almost completely discharged, the lifting beam just contacts the limit switch, at which point the lifting assembly can be stopped in time to prevent flocculent sludge from entering the annular overflow weir.

[0014] Furthermore, the support tray lifting limit mechanism also includes a bent frame, a sealing baffle ring and an annular protrusion. The inner wall of the sewage treatment tank is vertically slidably connected with the sealing baffle ring. The bottom of the sealing baffle ring is arranged on the annular protrusion. The top edge of the support tray is provided with an annular sealing groove corresponding to the support tray. The top of the sealing baffle ring is fixedly connected to the two sides of the U-shaped frame through two bent frames, and the distance between the bottom of the limit switch and the upper side of the lifting beam is equal to the distance between the bottom of the sealing baffle ring and the upper side of the support tray. When the lifting beam touches the limit switch, the lifting assembly stops in time. At this time, the top edge of the support tray contacts the bottom of the sealing ring, and the annular protrusion cooperates with the annular sealing groove to seal the gap between the outer peripheral side of the support tray and the inner wall of the sewage treatment tank. Although the thick high-quality aerobic granular sludge sedimentation layer can block the gap here when the clean water is discharged, and prevent the sewage added to the lower layer of the support tray from mixing with the clean water on the upper layer, the thick high-quality aerobic granular sludge sedimentation layer may be disturbed when the intermediate sludge removal mechanism removes the aerobic granular sludge with general sedimentation performance. The aerobic granular sludge may fall from the gap between the outer peripheral side of the support tray and the inner wall of the sewage treatment tank, which may also cause The sewage added below the tray moves upward through the gap between the outer peripheral side of the tray and the inner wall of the sewage treatment tank, which may allow untreated sewage to be discharged through the removal arc groove. Therefore, a sealing ring and an annular protrusion are provided to cooperate with the annular sealing groove to block the gap between the outer peripheral side of the tray and the inner wall of the sewage treatment tank when the middle sludge removal mechanism is working. Since there will be a gap when the sealing movable plate closes the rectangular through groove, a sealing strip can be provided on the side of the sealing movable plate to close the gap as much as possible. The above-mentioned method of closing the gap or gap is only to add a protective insurance. Smaller gaps will generally be blocked and closed by a thick layer of high-quality aerobic granular sludge sedimentation, and no problems will occur.

[0015] Compared with the existing technology, the sludge screening device of this sequencing batch aerobic granular sludge technology has the following beneficial effects: 1. The sludge screening device of the sequencing batch aerobic granular sludge technology uses a sewage treatment tank as the main body of the sequencing batch aerobic granular sludge reactor to treat sewage through a sequencing batch sewage treatment process. After the sewage is treated, the upper flocculent sludge can be pumped away, and the lightweight aerobic granular sludge with general settling performance can be removed and discharged, and the aerobic granular sludge with good settling performance can be screened out, which is beneficial to improving the treatment efficiency and treatment effect of sewage.

[0016] 2. The sludge screening device of the sequencing batch aerobic granular sludge technology drives the lifting drum, the supporting tray and the through-channel closing control mechanism to move upward in the sewage treatment tank through the lifting beam. After the upper clean water is discharged through the annular overflow weir and the clean water discharge pipe, the upper sludge discharge mechanism works to extract the flocculent sludge mixed with water for easy flow. Then the removal motor works to drive the rotating shaft to rotate clockwise. The arc control plate extends into the interior of the sewage treatment tank as the rotating shaft rotates clockwise, and at the same time opens the removal arc trough. The hybrid power component drives the lifting drum and the supporting tray to rotate counterclockwise. The light aerobic granular sludge with general settling performance encounters the outer arc surface of the arc control plate and is guided by the outer arc surface of the arc control plate to be discharged from the sewage treatment tank from the removal arc trough, completing the removal of the light aerobic granular sludge with general settling performance. The removal motor works to drive the rotating shaft to rotate counterclockwise, allowing the arc control plate to re-close the removal arc trough.

[0017] 3. The sludge screening device of the sequencing batch aerobic granular sludge technology, when the arc control plate rotates clockwise with the shaft and extends into the interior of the sewage treatment tank, the arc expansion rod extends from the arc groove, and the roller at the end of the arc expansion rod pushes the sealing arc plate in the direction away from the sewage treatment tank. At this time, the sealing arc plate slides along the sliding column through the sliding sleeve to compress the compression spring. During this period, the roller rolls with the inner arc surface of the sealing arc plate through the anti-wear notch to reduce the friction on the sealing arc plate. Since the sealing arc plate is away from the sewage treatment tank, after the arc groove is opened, the lightweight sediment Aerobic granular sludge with general performance can fall smoothly into the middle sludge receiving box through the arc groove. When the arc control plate moves counterclockwise with the rotating shaft to close the arc groove, the arc expansion rod also enters the arc groove. The arc expansion rod no longer pushes the sealing arc plate through the roller. The compression spring resets and extends, pushing the sealing arc plate along the sliding column to the outside of the sewage treatment tank again. The gap between the arc groove and the arc control plate is closed with the help of a rubber arc sealing gasket to prevent sewage from leaking through the gap here when sewage is treated in the sewage treatment tank.

[0018] 4. The sludge screening device of the sequencing batch aerobic granular sludge technology can extract the flocculent sludge and water in the upper layer and separate the sludge through a cyclone after the clean water in the upper layer of the sewage treatment tank is discharged through the annular overflow weir and the clean water discharge pipe. It can also use the middle-layer sludge removal mechanism to remove the precipitated light sludge in the upper layer, and screen out the aerobic granular sludge with good settling performance in the bottom layer, thereby optimizing the microbial community in the sewage treatment tank and improving the treatment effect of the aerobic granular sludge on sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a sludge screening device for the sequencing batch aerobic granular sludge technology of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the partially enlarged structure at center A; Figure 3 For the present invention Figure 1 A schematic diagram of the partially enlarged structure at point B in the middle; Figure 4 This is a schematic diagram of the rear structure of the sludge screening device of the sequencing batch aerobic granular sludge technology of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the partially enlarged structure at point C in the middle; Figure 6 For the present invention Figure 4 The schematic diagram of the partially enlarged structure at D in the middle; Figure 7 Schematic diagram of the partial structure of the sludge screening device of the sequencing batch aerobic granular sludge technology of the present invention Figure 1 ; Figure 8 For the present invention Figure 7 The schematic diagram of the local enlarged structure at E in the middle; Figure 9 Schematic diagram of the partial structure of the sludge screening device of the sequencing batch aerobic granular sludge technology of the present invention Figure 2 ; Figure 10 For the present invention Figure 9 Schematic diagram of the structure from above; Figure 11 For the present invention Figure 10 Schematic diagram of the cross-section structure at F in the middle; Figure 12 For the present invention Figure 11 Schematic diagram of the partially enlarged structure at G in the middle; Figure 13 Schematic diagram of the partial structure of the sludge screening device of the sequencing batch aerobic granular sludge technology of the present invention Figure 3 ; Figure 14 Schematic diagram of the partial structure of the sludge screening device of the sequencing batch aerobic granular sludge technology of the present invention Figure 4 ; In the figure: 1 sewage treatment tank, 2 sludge sedimentation support mechanism, 21 vertical rail, 22 sliding block, 23 support rod, 24 lifting beam, 25 lifting drum, 26 round cover, 27 round seat, 28 supporting tray, 29 rectangular through slot, 210 annular sealing slot, 211 lifting screw 1, 212 screw nut 1, 213 driven gear 1, 214 power motor 1, 215 driving gear 1, 216 lifting motor, 3 through slot closing control mechanism, 31 control drum, 32 driven gear 2, 33 driving gear 2, 34 control motor, 35 motor mounting sleeve, 36 end gear, 37 sealing bearing, 38 control shaft, 39 control gear, 310 sealing movable plate, 311 sealing ring, 4 middle layer sludge removal mechanism, 41 removing arc slot, 42 rotating shaft, 43 removing motor, 44 motor bracket, 45 arc control plate, 46 middle layer sludge receiving box, 47 collecting bucket, 48 transfer pipe, 5 arc groove gap sealing mechanism, 51 sliding column, 52 sealing arc plate, 53 sliding sleeve, 54 compression spring, 55 limit nut, 56 arc sealing gasket, 57 anti-wear notch, 58 arc groove, 59 arc expansion rod, 510 roller, 6 upper sludge discharge mechanism, 61 arched discharge pipe, 62 sludge pump, 63 slide rail, 64 slider, 65 lifting platform, 66 cyclone, 67 boss, 68 electric telescopic rod, 7 tray lifting limit mechanism, 71 column, 72 U-shaped frame, 73 screw nut 2, 74 lifting screw 2, 75 knob, 76 limit switch, 77 bent frame, 78 sealing retaining ring, 79 annular protrusion, 8 sewage adding mechanism, 81 rotary joint, 82 hard conduit, 83 conduit bracket, 84 soft and hard pipe joint, 85 follow-up hose, 9 annular overflow weir, 10 clean water discharge pipe. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] For example 1, please refer to Figures 1 to 14 This embodiment provides a technical solution: a sludge screening device for sequencing batch aerobic granular sludge technology, including a sewage treatment tank 1, a sludge sedimentation support mechanism 2, a through trough sealing control mechanism 3, a middle layer sludge removal mechanism 4, an arc groove gap sealing mechanism 5 and an upper layer sludge discharge mechanism 6.

[0022] The sludge sedimentation supporting mechanism 2 includes a lifting beam 24, a lifting drum 25, a round cover 26, a round seat 27, a supporting tray 28, a rectangular through-slot 29, a lifting component and a hybrid power component. The outer top of the sewage treatment tank 1 is connected to the lifting beam 24 through the lifting component. The lifting beam 24 spans the upper middle part of the sewage treatment tank 1, and the middle part of the lifting beam 24 is rotatably connected to the top of the vertical lifting drum 25 through a bearing. The outer peripheral side of the bottom of the lifting drum 25 is fixedly connected to the middle part of the round cover 26, and the round cover 26 is fixedly connected to the top of the round seat 27 by screws. The outer side of the round seat 27 is fixedly sleeved with a supporting tray 28. A plurality of rectangular through-slots 29 are provided in a circular array on the supporting tray 28. The centers of the lifting drum 25, the round cover 26, the round seat 27 and the supporting tray 28 coincide. A circular groove is provided on the upper side of the round seat 27, and the outer diameter of the supporting tray 28 is slightly smaller than the inner diameter of the sewage treatment tank 1. The lifting assembly includes a vertical rail 21, a sliding block 22, a support rod 23, a lifting screw 211, a screw nut 212, and a lifting motor 216. Two vertical rails 21 are fixedly connected to the outside of the sewage treatment tank 1 on both sides. Two sliding blocks 22 are vertically slidably connected in the two vertical rails 21. The two sliding blocks 22 are fixedly connected to the bottom ends of the two support rods 23 by bolts. The top ends of the two support rods 23 are fixedly connected to the two ends of the lifting beam 24. A vertical lifting screw 211 is rotatably connected in one of the vertical rails 21. A screw nut 212 is fixedly connected to the sliding block 22 in the vertical rail 21. The screw nut 212 It is connected with the lifting screw 211, and the top of the lifting screw 211 is fixedly connected to the output shaft of the lifting motor 216. The lifting motor 216 is installed on the top of the corresponding vertical rail 21. The lifting motor 216 drives the lifting screw 211 to rotate clockwise, and the threaded action of the lifting screw 211 and the screw nut 212 drives the sliding block 22 to move up along the vertical rail 21, thereby driving the lifting beam 24 to move up. The lifting motor 216 drives the lifting screw 211 to rotate counterclockwise, and the threaded action of the lifting screw 211 and the screw nut 212 drives the sliding block 22 to move down along the vertical rail 21, thereby driving the lifting beam 24 to move down.

[0023] The hybrid power assembly includes a driven gear 213, a power motor 214, and a driving gear 215. The lifting drum 25 is located at the lower side of the lifting beam 24 and is fixedly connected to the driven gear 213. The power motor 214 is installed on the lifting beam 24. The output shaft of the power motor 214 is fixedly connected to the driving gear 215. The driving gear 215 is meshed with the driven gear 213. When the power motor 214 works, the lifting drum 25 is driven to rotate relative to the lifting beam 24 through the transmission of the driven gear 213 and the driving gear 215.

[0024] The through slot closing control mechanism 3 is mounted on the lifting drum 25 and the round seat 27; The through-slot closure control mechanism 3 includes a rotation control component, a transmission component, and a through-slot closure component. The transmission component is installed inside the lifting drum 25 and the round seat 27. The top of the transmission component is connected to the rotation control component. The through-slot closure component is installed in the rectangular through-slot 29, and the through-slot closure component is connected to the transmission component. The rotation control component drives the through-slot closure component to work through the transmission component, allowing the through-slot closure component to open or close the rectangular through-slot 29. When the through-slot closure component opens the rectangular through-slot 29, the through-slot closure component itself can serve as a stirring blade, and as the support tray 28 rotates, it can stir the sewage in the sewage treatment tank 1. When the through-slot closure component closes the rectangular through-slot 29, aerobic granular sludge can settle on the upper side of the support tray 28 without falling through the rectangular through-slot 29 to the bottom of the support tray 28. The support tray 28 can support the settled aerobic granular sludge layer to move upward, and discharge the upper clean water through the annular overflow weir 9.

[0025] The through-slot closing assembly includes a sealed bearing 37, a control shaft 38 and a sealed movable plate 310. The side of the round seat 27 corresponding to the middle of each rectangular through-slot 29 is rotatably connected to a control shaft 38 through a sealed bearing 37. One end of the control shaft 38 located in the rectangular through-slot 29 is fixedly connected to the end center of the sealed movable plate 310, and the control shaft 38 is distributed radially along the round seat 27. The control shaft 38 can rotate relative to the round seat 27 through the sealed bearing 37, thereby driving the sealing movable plate 310 to move in the rectangular groove 29. When the sealing movable plate 310 is in a horizontal state in the rectangular groove 29, the sealing movable plate 310 closes the rectangular groove 29. At this time, aerobic granular sludge can be deposited on the upper side of the support tray 28. Even if there is a gap between the sealing movable plate 310 and the rectangular groove 29, the deposited aerobic granular sludge will also block the gap. When the sealing movable plate 310 is in a vertically distributed state in the rectangular groove 29, the sealing movable plate 310 opens the rectangular groove 29. The sealing movable plate 310 can act as a blade to stir the sewage in the sewage treatment tank 1 as the support tray 28 rotates. At the same time, the sewage in the upper and lower layers of the support tray 28 can exchange and flow through the rectangular groove 29, and the air blown out by the aeration device at the bottom of the sewage treatment tank 1 can also overflow upward through the rectangular groove 29.

[0026] Among them, when the sealing movable plate 310 acts as a blade and rotates with the support tray 28 and moves up and down to stir the sewage in the sewage treatment tank 1, the angle between the sealing movable plate 310 and the support tray 28 can also be changed as needed. For example, the angle between the sealing movable plate 310 and the support tray 28 is set to 45 degrees. When the sealing movable plate 310 acts as a blade to stir the sewage, due to the angle of the sealing movable plate 310, it can also promote the exchange flow of sewage above and below the rectangular through groove 29.

[0027] The transmission assembly includes a control drum 31, an end gear 36, and a control gear 39. The control drum 31 is rotatably mounted inside the lifting drum 25. The bottom end of the control drum 31 extends through a through-hole at the bottom of the round seat 27 to the underside of the round seat 27. The control drum 31 is located at the bottom of the round seat 27 and is fixedly sleeved with the end gear 36. Each control shaft 38 is fixedly connected to a control gear 39 at one end within the round seat 27. The end gears 36 mesh with each end gear 36. The top of the control drum 31 is higher than the top of the lifting drum 25. The top of the control drum 31 is connected to the top outer side of the lifting drum 25 via the rotation control assembly. The rotation control assembly is used to drive the control drum 31 to rotate relative to the lifting drum 25, thereby driving the end gears 36 to rotate. The end gears 36 can synchronously drive the rotation of each control shaft 38 through each control gear 39.

[0028] The rotation control assembly includes a driven gear 2 32, a driving gear 2 33, a control motor 34, and a motor mounting sleeve 35. The control motor 34 is installed on the top outer side of the lifting drum 25 through the motor mounting sleeve 35. The output shaft of the control motor 34 is fixedly connected to the driving gear 2 33. The driven gear 2 32 is fixedly installed on the top outer side of the control drum 31. The driven gear 2 32 is meshed with the driving gear 2 33. When the control motor 34 works, the control drum 31 is driven to rotate relative to the lifting drum 25 through the transmission of the driven gear 2 32 and the driving gear 2 33. Since the lifting drum 25 also rotates, the cable will be entangled when power is supplied to the control motor 34 through the cable. Therefore, it is necessary to install a conductive slip ring on the top of the lifting drum 25 to supply power to the control motor 34 with the help of the conductive slip ring to avoid the entanglement problem caused by direct power supply through the cable.

[0029] The through-groove closing control mechanism 3 also includes a sealing ring 311. A rubber sealing ring 311 is provided at the connection between the lifting drum 25 and the round seat 27. The sealing ring 311 prevents sewage from entering the interior of the round seat 27 through the connection between the lifting drum 25 and the round seat 27. The same sealing ring 311 can also be provided at the connection between the bottom of the lifting drum 25 and the control drum 31 to seal the gap between the lifting drum 25 and the control drum 31.

[0030] A sewage adding mechanism 8 is also provided, which includes a rotary joint 81, a hard conduit 82, a conduit bracket 83, a soft and hard pipe joint 84, and a follower hose 85. The top of the control drum 31 is connected to one end of the hard conduit 82 through the rotary joint 81, and the hard conduit 82 is installed on the lifting beam 24 through the conduit bracket 83. Due to the setting of the rotary joint 81, the control drum 31 still maintains a communication state with the control drum 31 when it rotates. The other end of the hard conduit 82 is connected to one end of the follower hose 85 through the soft and hard pipe joint 84, and the other end of the follower hose 85 Connect to the external water supply pump. Due to the existence of the follow-up hose 85, sewage can still be delivered through the follow-up hose 85 when the control drum 31 moves up and down. The external water supply pump delivers the external sewage to be treated into the hard conduit 82 through the follow-up hose 85, and then enters the control drum 31, and is delivered to the area below the support tray 28 in the sewage treatment tank 1 through the bottom end of the control drum 31. A water distributor can be installed at the bottom end of the control drum 31 to allow the delivered sewage to be evenly diffused in the area below the support tray 28, making it easier to evenly mix with the aerobic granular sludge delivered to the sewage treatment tank 1.

[0031] The middle layer sludge removal mechanism 4 is installed on the side of the sewage treatment tank 1, and the arc groove gap sealing mechanism 5 is installed on the outside of the sewage treatment tank 1 at a position corresponding to the middle layer sludge removal mechanism 4; The middle-layer sludge removal mechanism 4 includes a removal arc groove 41, a rotating shaft 42, a removal motor 43, a motor bracket 44 and an arc control panel 45. A removal arc groove 41 is provided on the side of the sewage treatment tank 1. The removal arc groove 41 is located in the upper middle part of the sewage treatment tank 1. One end of the removal arc groove 41 is rotatably connected to a vertical rotating shaft 42. The rotating shaft 42 is located on one side of the removal arc groove 41 and is fixedly connected to one end of the arc control panel 45. The top of the rotating shaft 42 extends to the upper side of the sewage treatment tank 1 and is fixedly connected to the output shaft of the removal motor 43. The removal motor 43 is installed on the top of the sewage treatment tank 1 through the motor bracket 44. The lifting assembly drives the lifting drum 25, the supporting tray 28 and the through slot closing control mechanism 3 to move upward in the sewage treatment tank 1 through the lifting beam 24. After the upper clean water is discharged through the annular overflow weir 9 and the clean water discharge pipe 10, the upper sludge discharge mechanism 6 works to remove the flocculent sludge mixed with water on the upper layer that is easy to flow. Then the removal motor 43 works, drives the rotating shaft 42 to rotate clockwise, and the arc control plate 45 extends into the interior of the sewage treatment tank 1 as the rotating shaft 42 rotates clockwise, and at the same time opens The arc groove 41 is removed, and the hybrid power component drives the lifting drum 25 and the supporting tray 28 to rotate counterclockwise. The aerobic granular sludge with light sedimentation performance and general performance encounters the outer arc surface of the arc control plate 45, and is guided by the outer arc surface of the arc control plate 45 to be discharged from the sewage treatment tank 1 from the arc groove 41, completing the removal of the aerobic granular sludge with light sedimentation performance and general performance. The removal motor 43 works and drives the rotating shaft 42 to rotate counterclockwise, so that the arc control plate 45 can re-close the arc groove 41.

[0032] The middle-layer sludge removal mechanism 4 also includes a middle-layer sludge receiving box 46, a collection hopper 47, and a transfer pipe 48. The middle-layer sludge receiving box 46 is fixedly connected to the outside of the sewage treatment tank 1 below the removal arc groove 41. The bottom of the middle-layer sludge receiving box 46 is fixedly connected to the top of the collection hopper 47, and the bottom of the collection hopper 47 is connected to the transfer pipe 48. Lightweight aerobic granular sludge with average settling performance discharged from the removal arc groove 41 falls into the middle-layer sludge receiving box 46, is collected by the collection hopper 47, and then can be transferred through the transfer pipe 48.

[0033] The arc groove gap sealing mechanism 5 includes a sliding column 51, a sealing arc plate 52, a sliding sleeve 53, a compression spring 54, a limiting nut 55, an arc sealing gasket 56, an anti-wear notch 57, an arc groove 58, an arc expansion rod 59 and a roller 510. A sealing arc plate 52 is provided on the outside of the sewage treatment tank 1 at a position corresponding to the removal of the arc groove 41. The top of the sealing arc plate 52 is fixedly connected to two sliding sleeves 53. Two horizontal sliding columns 51 are slidably connected in the two sliding sleeves 53. One end of the two sliding columns 51 is fixedly connected to the outside of the sewage treatment tank 1, and the other end of the two sliding columns 51 is separately connected. A limiting nut 55 is separately threadedly connected, and a compression spring 54 is sleeved on the part of the limiting nut 55 located between the limiting nut 55 and the sliding sleeve 53. An arc groove 58 is provided at the end of the arc groove 41 close to the rotating shaft 42. The end of the arc control plate 45 is fixedly connected to an arc expansion rod 59 corresponding to the position of the arc groove 58. A roller 510 is rotatably installed on the end of the arc expansion rod 59 away from the arc control plate 45. An arc sealing gasket 56 is provided on the side of the sealing arc plate 52 close to the sewage treatment tank 1, and an anti-wear notch 57 is provided in the area of the arc sealing gasket 56 corresponding to the arc groove 58. When the arc control plate 45 rotates clockwise with the rotating shaft 42 and extends into the interior of the sewage treatment tank 1, the arc expansion rod 59 extends from the arc groove 58, and the roller 510 at the end of the arc expansion rod 59 pushes the sealing arc plate 52 in the direction away from the sewage treatment tank 1. At this time, the sealing arc plate 52 slides along the sliding column 51 through the sliding sleeve 53 to compress the compression spring 54. During this period, the roller 510 rolls in contact with the inner arc surface of the sealing arc plate 52 through the anti-wear notch 57 to reduce the friction on the sealing arc plate 52. Since the sealing arc plate 52 is away from the sewage treatment tank 1, after the arc groove 41 is opened, the lightweight aerobic particles with general sedimentation performance The granular sludge can smoothly fall into the middle sludge receiving box 46 through the removal arc groove 41. When the arc control plate 45 moves counterclockwise with the rotating shaft 42 to close the removal arc groove 41, the arc expansion rod 59 also enters the arc groove 58. The arc expansion rod 59 no longer pushes the sealing arc plate 52 through the roller 510. The compression spring 54 resets and extends, pushing the sealing arc plate 52 along the sliding column 51 to approach the outside of the sewage treatment tank 1 again. With the help of the rubber arc sealing gasket 56, the gap between the removal arc groove 41 and the arc control plate 45 is closed to prevent sewage from leaking through the gap here when sewage treatment is carried out in the sewage treatment tank 1.

[0034] The upper sludge discharge mechanism 6 is installed on the outside of the sewage treatment tank 1 .

[0035] During use, an aeration device is installed at the bottom of the sewage treatment tank 1 to aerate the bottom of the sewage treatment tank 1 to promote the growth of aerobic granular sludge in the sewage treatment tank 1. An annular overflow weir 9 is provided at the top of the sewage treatment tank 1. The annular overflow weir 9 is connected to one end of the clean water discharge pipe 10, and the other end of the clean water discharge pipe 10 extends to the outside of the sewage treatment tank 1. A hybrid power component is connected to the top of the lifting drum 25. The hybrid power component is used to drive the lifting drum 25 to rotate, and the lifting drum 25 drives the supporting tray 28 to rotate in the sewage treatment tank 1. With the help of the through-groove closing control mechanism 3, the aerobic granular sludge and the newly added sewage in the sewage treatment tank 1 can be stirred to promote the full reaction of the aerobic granular sludge and the newly added sewage. The lifting component drives the lifting drum 25 through the lifting beam 24. The descending drum 25, the supporting tray 28 and the through-channel closing control mechanism 3 move up and down in the sewage treatment tank 1, and the height of the through-channel closing control mechanism 3 in the sewage treatment tank 1 can be changed to fully stir the aerobic granular sludge and the newly added sewage in the sewage treatment tank 1. During stirring, the aeration device is used for continuous aeration to promote the rapid growth and formation of aerobic granular sludge. Then the hybrid power component and the aeration device stop working, and the lifting component drives the lifting drum 25, the supporting tray 28 and the through-channel closing control mechanism 3 to descend to the lowest position in the sewage treatment tank 1. The through-channel closing control mechanism 3 works to close the rectangular through-channel 29 on the supporting tray 28, and waits for the aerobic granular sludge to settle. Since the rectangular through-channel 29 on the supporting tray 28 has been closed, the sedimentation performance is good. The aerobic granular sludge first settles to the upper side of the support tray 28 to form a thick high-quality aerobic granular sludge sedimentation layer, which is the lower sludge. Then the light aerobic granular sludge with general sedimentation performance settles to form the middle sludge. Finally, the flocculent sludge settles to form the upper sludge. The upper sludge is a mixture of flocculent sludge and water, which is easy to flow. The upper layer in the sewage treatment tank 1 is clean water. The lifting component drives the lifting drum 25, the support tray 28 and the through-channel closing control mechanism 3 to move upward in the sewage treatment tank 1 through the lifting beam 24. At the same time, the sewage to be treated is added to the space below the support tray 28 in the sewage treatment tank 1. Due to the thick high-quality aerobic granular sludge sedimentation layer, the sewage below the support tray 28 will not mix with the clean water in the upper layer of the sewage treatment tank 1. At this time, the sewage is The clean water in the upper layer of the treatment tank 1 enters the annular overflow weir 9 and is then discharged through the clean water discharge pipe 10 until the clean water in the upper layer is completely discharged. The upper sludge discharge mechanism 6 works to pump away the flocculent sludge mixed with water in the upper layer for easy flow. Then the middle sludge removal mechanism 4 works to push open the arc groove gap sealing mechanism 5 to remove the lightweight aerobic granular sludge with general sedimentation performance and discharge it from the sewage treatment tank 1, leaving the high-quality aerobic granular sludge sedimentation layer on the upper side of the tray 28. The through slot closing control mechanism 3 opens the rectangular through slot 29 on the tray 28, and the hybrid power component, aeration device and lifting component start working to continue adding sewage to be treated into the sewage treatment tank 1. The sewage in the sewage treatment tank 1 is stirred through the tray 28 and the through slot closing control mechanism 3.The high-quality aerobic granular sludge sedimentation layer is mixed with the sewage to promote the formation of more aerobic granular sludge. The aerobic granular sludge then treats the sewage. The sewage treatment tank 1 serves as the main body of the sequencing batch aerobic granular sludge reactor. It treats the sewage through the sequencing batch sewage treatment process. After the sewage is treated, the flocculent sludge on the upper layer can be pumped away, and the light aerobic granular sludge with poor settling performance can be removed and discharged. The aerobic granular sludge with good settling performance is screened and retained, which is conducive to improving the treatment efficiency and treatment effect of the sewage.

[0036] For example 2, please refer to Figures 1 to 14 , this embodiment provides a technical solution: a sludge screening device for sequencing batch aerobic granular sludge technology, and this embodiment is a further explanation of the embodiment; The upper sludge discharge mechanism 6 includes an arched discharge pipe 61, a sludge pump 62, a slide rail 63, a slider 64, a lifting platform 65, a cyclone 66 and a sludge discharge height control component. Two vertical slide rails 63 are fixedly connected to the outside of the top of the sewage treatment tank 1. Two sliders 64 are respectively slidably connected in the two slide rails 63. The two sliders 64 are fixedly connected to the side of the lifting platform 65. The cyclone 66 and the sludge pump 62 are respectively installed on the lifting platform 65. The water outlet of the sludge pump 62 is connected to the inlet of the cyclone 66, and the water inlet of the sludge pump 62 is fixedly connected to one end of the arched discharge pipe 61. The other end of the arched discharge pipe 61 extends to the inside of the top of the sewage treatment tank 1. The arched discharge pipe 61 is a hard pipe, and the bottom of the lifting platform 65 is connected to the sludge discharge height control component.

[0037] The mud discharge height control component includes a boss 67 and an electric telescopic rod 68. The bottom of the lifting platform 65 is fixedly connected to the top of the electric telescopic rod 68. The bottom end of the electric telescopic rod 68 is fixedly connected to the outside of the sewage treatment tank 1 through the boss 67. The electric telescopic rod 68 is extended and retracted to drive the lifting platform 65 to move up and down.

[0038] When in use, the sludge discharge height control component is used to drive the lifting platform 65 to move up and down along the slide rail 63, so that the height of the end of the arched discharge pipe 61 in the sewage treatment tank 1 can be adjusted, so that one end of the arched discharge pipe 61 located in the sewage treatment tank 1 is just at the bottom of the flocculent sludge. The sludge pump 62 works by means of the arched discharge pipe 61 to just suck out the flocculent sludge and the mixed water, and then send them into the cyclone 66. The flocculent sludge flows out from the bottom flow port of the cyclone 66, and the separated water is discharged through the overflow port of the cyclone 66, completing the discharge and separation of the flocculent sludge. Since the mixture of flocculent sludge and sewage is still fluid, it can be discharged with the help of the arched discharge pipe 61, and the light aerobic granular sludge with general sedimentation performance has general fluidity because it is removed with the help of the middle layer sludge removal mechanism 4.

[0039] For example three, please refer to Figures 1 to 14This embodiment provides a technical solution: a sludge screening device for sequencing batch aerobic granular sludge technology. The structure of this embodiment is roughly the same as that of the second embodiment, except that: It also includes a tray lifting limit mechanism 7, which includes a U-shaped frame 72, a lifting height control component and a limit switch 76. The top of the sewage treatment tank 1 is installed with a U-shaped frame 72 through the lifting height control component. The U-shaped frame 72 is located above the end of the lifting beam 24, and a limit switch 76 is installed in the middle of the lifting beam 24 corresponding to the position of the lifting beam 24.

[0040] The lifting height control component can adjust the height of the U-shaped frame 72 and the limit switch 76. When the lifting component drives the lifting beam 24 and the supporting tray 28 to rise and discharge the upper layer of clean water, the lifting beam 24 gradually approaches the limit switch 76. When the upper layer of clean water is almost drained, the lifting beam 24 just touches the limit switch 76. At this time, the lifting component can stop working in time to prevent flocculent sludge from entering the annular overflow weir 9.

[0041] The tray lifting limit mechanism 7 also includes a bent frame 77, a sealing retaining ring 78 and an annular protrusion 79. The inner wall of the sewage treatment tank 1 is vertically slidably connected with the sealing retaining ring 78. The bottom of the sealing retaining ring 78 is arranged with the annular protrusion 79. The top edge of the tray 28 is provided with an annular sealing groove 210 corresponding to the tray 28. The top of the sealing retaining ring 78 is fixedly connected to the two sides of the U-shaped frame 72 through two bent frames 77, and the distance between the bottom of the limit switch 76 and the upper side of the lifting beam 24 is equal to the distance between the bottom of the sealing retaining ring 78 and the upper side of the tray 28.

[0042] When the lock is unlocked, the lock is unlocked, and the lock is unlocked, so that the lock is unlocked, and the lock is unlocked, and the lock is unlocked, so that the lock is unlocked, and the lock is unlocked. The further the distance, the more sludge settled on the support tray 28 will be removed, and the thickness of the sludge left on the support tray 28 will become smaller, which means that the remaining sludge has better sedimentation properties. The lifting screw 24 is driven by the knob 75 to rotate counterclockwise, and the threaded action of the lifting screw 24 and the screw nut 23 drives the U-shaped frame 72 to move downward along the column 71. When the aerobic granular sludge with general settling performance is cleaned by the middle-layer sludge removal mechanism 4, the support tray 28 can move up a closer distance, and the aerobic granular sludge removed by the middle-layer sludge removal mechanism 4 on the support tray 28 is reduced, and the sludge thickness left on the support tray 28 becomes larger. Therefore, the lifting height control component can control the range of the up and down movement of the support tray 28 and the lifting beam 24, control the thickness of the aerobic granular sludge with general settling performance removed by the middle-layer sludge removal mechanism 4, and also control the thickness of the aerobic granular sludge left on the support tray 28.

[0043] When the lifting beam 24 touches the limit switch 76, the lifting assembly stops in time. At this time, the top edge of the support tray 28 contacts the bottom of the sealing ring 78, and the annular protrusion 79 cooperates with the annular sealing groove 210 to seal the gap between the outer peripheral side of the support tray 28 and the inner wall of the sewage treatment tank 1. Although the thick high-quality aerobic granular sludge sedimentation layer can block the gap here when the clean water is discharged, and the sewage added to the lower layer of the support tray 28 is not mixed with the clean water on the upper layer, the middle sludge removal mechanism 4 may disturb the thick high-quality aerobic granular sludge sedimentation layer when removing the aerobic granular sludge with average sedimentation performance. The aerobic granular sludge may fall from the gap between the outer peripheral side of the support tray 28 and the inner wall of the sewage treatment tank 1, which may also cause the support tray to The sewage added below the tray 28 moves upward through the gap between the outer peripheral side of the tray 28 and the inner wall of the sewage treatment tank 1, which may allow untreated sewage to be discharged through the arc groove 41. Therefore, a sealing ring 78 and an annular protrusion 79 are provided to cooperate with the annular sealing groove 210 to block the gap between the outer peripheral side of the tray 28 and the inner wall of the sewage treatment tank 1 when the middle sludge removal mechanism 4 is working. Since there will be a gap when the sealing movable plate 310 closes the rectangular through groove 29, a sealing strip can be provided on the side of the sealing movable plate 310 to close the gap as much as possible. The above-mentioned method of closing the gap or gap is only to add a protective insurance. Smaller gaps will generally be blocked and closed by the thick high-quality aerobic granular sludge sedimentation layer, and no problems will occur.

[0044] See also Figures 1 to 14 , a method for using a sludge screening device of a sequencing batch aerobic granular sludge technology, comprising the following steps; Sewage is fed into the sewage treatment tank 1 through the control drum 31 in the through slot closing control mechanism 3 and mixed with the aerobic granular sludge originally left in the sewage treatment tank 1; The rotation control assembly is used to drive the control drum 31 to rotate relative to the lifting drum 25, thereby driving the end gear 36 to rotate. The end gear 36 can synchronously drive the control shafts 38 to rotate through the control gears 39. The sealing movable plate 310 is in a vertically distributed state within the rectangular through-slot 29. At this time, the sealing movable plate 310 opens the rectangular through-slot 29. The hybrid power assembly drives the lifting drum 25 to rotate, and the lifting drum 25 drives the receiving tray 28 to rotate in the sewage treatment tank 1. The receiving tray 28 stirs the sewage in the sewage treatment tank 1 through the sealing movable plate 310 in the through-slot closing control mechanism 3; The lifting assembly drives the lifting drum 25, the supporting tray 28 and the through slot closing control mechanism 3 to move up and down in the sewage treatment tank 1 through the lifting beam 24, thereby changing the height of the through slot closing control mechanism 3 in the sewage treatment tank 1 and achieving sufficient agitation of the aerobic granular sludge and the newly added sewage in the sewage treatment tank 1; During the stirring, the aeration device is used to continuously aerate the bottom of the sewage treatment tank 1, thereby promoting the rapid growth and formation of aerobic granular sludge. Then, the hybrid power assembly and the aeration device stop working, and the lifting assembly drives the lifting drum 25, the supporting tray 28 and the through-channel closing control mechanism 3 to descend to the lowest position in the sewage treatment tank 1. The rotation control component in the slot closing control mechanism 3 works, and the sealing movable plate 310 is in a horizontal state in the rectangular slot 29 through the transmission component, so that the rectangular slot 29 on the receiving tray 28 is closed, and the aerobic granular sludge is left to settle. Since the rectangular slot 29 on the receiving tray 28 has been closed, the high-quality aerobic granular sludge with good settling performance first settles to the upper side of the receiving tray 28 to form a thick high-quality aerobic granular sludge sedimentation layer, which is the lower sludge layer. Then the light aerobic granular sludge with average settling performance settles to form the middle sludge layer, and finally the flocculent sludge settles to form the upper sludge layer. The upper sludge layer is a mixture of flocculent sludge and water, which is easy to flow. The upper layer in the sewage treatment tank 1 is clear water. The lifting assembly drives the lifting drum 25, the receiving tray 28 and the through-channel closing control mechanism 3 upward in the sewage treatment tank 1 through the lifting beam 24, and at the same time, uses the control drum 31 to add sewage to the space below the receiving tray 28 in the sewage treatment tank 1. Due to the thick, high-quality aerobic granular sludge sedimentation layer, the sewage below the tray 28 will not mix with the clean water in the upper layer of the sewage treatment tank 1. At this time, the clean water in the upper layer of the sewage treatment tank 1 enters the annular overflow weir 9 and is then discharged through the clean water discharge pipe 10. After the upper layer of clean water is completely discharged, the upper sludge discharge mechanism 6 works to pump away the flocculent sludge mixed with water on the upper layer for easy flow; The removal motor 43 drives the rotating shaft 42 to rotate clockwise, and the arc control plate 45 extends into the interior of the sewage treatment tank 1 as the rotating shaft 42 rotates clockwise, and at the same time opens the removal arc groove 41, and the arc expansion rod 59 extends from the arc groove 58. With the help of the roller 510 at the end of the arc expansion rod 59, the sealing arc plate 52 is pushed in the direction away from the sewage treatment tank 1. At this time, the sealing arc plate 52 slides along the sliding column 51 through the sliding sleeve 53, compressing the compression spring 54. Since the sealing arc plate 52 is away from the sewage treatment tank 1, after the removal arc groove 41 is opened, the light aerobic granular sludge with general settling performance smoothly falls into the middle sludge receiving box 46 through the removal arc groove 41; The hybrid power assembly drives the lifting drum 25 and the support tray 28 to rotate counterclockwise. The light aerobic granular sludge with moderate settling performance encounters the outer arc surface of the arc control plate 45 and is guided by the outer arc surface of the arc control plate 45 to be discharged from the sewage treatment tank 1 through the removal arc groove 41, completing the removal of the light aerobic granular sludge with moderate settling performance. The removal motor 43 drives the rotating shaft 42 to rotate counterclockwise, allowing the arc control plate 45 to reclose the removal arc groove 41, and the arc opening rod 59 also enters the arc groove 58. The arc opening rod 59 no longer pushes the sealing arc plate 52 through the roller 510, and the compression spring 54 resets and extends, pushing the sealing arc plate 52 along the sliding column 51 to re-close to the outside of the sewage treatment tank 1. The gap between the removal arc groove 41 and the arc control plate 45 is sealed with the help of the rubber arc sealing gasket 56, so as to prevent sewage from leaking out through the gap here when sewage treatment is being carried out in the sewage treatment tank 1; The sewage to be treated is continued to be added into the sewage treatment tank 1 by controlling the drum 31 , and then the above steps are repeated to complete the sludge screening work in the sewage treatment process using the sequencing batch aerobic granular sludge technology.

[0045] The screening of aerobic granular sludge does not require separate equipment and is directly attached to the main body of the sequencing batch aerobic granular sludge reactor.

[0046] It is worth noting that the power motor 214, lifting motor 216, control motor 34, removal motor 43, sludge pump 62, and electric telescopic rod 68 disclosed in the above embodiments are all controlled by an external PLC controller, and the control method adopts the method commonly used in the prior art, among which the power motor 214, lifting motor 216, control motor 34, and removal motor 43 all adopt servo motors.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sludge screening device for sequencing batch aerobic granular sludge technology, comprising a sewage treatment tank (1), characterized in that: Also includes: A sludge sedimentation support mechanism (2) includes a support tray (28), the outer top of the sewage treatment tank (1) is connected to a lifting beam (24) through a lifting assembly, and the middle of the lifting beam (24) is rotatably connected to the top of a vertical lifting drum (25), the bottom outer peripheral side of the lifting drum (25) is fixedly connected to the middle of a round cover (26), the round cover (26) is connected to the top of a round seat (27), the outer side of the round seat (27) is fixedly sleeved with a support tray (28), and a plurality of rectangular through slots (29) are formed in a circular array on the support tray (28); A through slot closing control mechanism (3) is mounted on the lifting drum (25) and the round seat (27); A middle-layer sludge removal mechanism (4) is installed on the side of the sewage treatment tank (1), and an arc groove gap sealing mechanism (5) is installed on the outside of the sewage treatment tank (1) at a position corresponding to the middle-layer sludge removal mechanism (4); The upper sludge discharge mechanism (6) is installed outside the sewage treatment tank (1).

2. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 1, characterized in that: The through slot closing control mechanism (3) comprises a rotation control component, a transmission component and a through slot closing component. The transmission component is installed inside the lifting drum (25) and the round seat (27). The top of the transmission component is connected to the rotation control component. The through slot closing component is installed in the rectangular through slot (29), and the through slot closing component is connected to the transmission component.

3. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 2, characterized in that: The through slot closing assembly includes a sealing bearing (37), a control shaft (38) and a sealing movable plate (310). The side surface of the round seat (27) corresponds to the middle of each rectangular through slot (29) and is rotatably connected to a control shaft (38) via a sealing bearing (37). One end of the control shaft (38) located in the rectangular through slot (29) is fixedly connected to the end center of the sealing movable plate (310).

4. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 3, characterized in that: The transmission assembly includes a control drum (31), an end face gear (36) and a control gear (39). The control drum (31) is rotatably mounted on the inner side of the lifting drum (25). The bottom end of the control drum (31) passes through the through hole at the bottom of the round seat (27) and extends to the lower side of the round seat (27). The control drum (31) is located at the bottom of the round seat (27) and is fixedly sleeved with the end face gear (36). One end of each control shaft (38) located in the round seat (27) is fixedly connected to the control gear (39). The end face gear (36) is meshed with each end face gear (36). The top of the control drum (31) is connected to the outer side of the top of the lifting drum (25) through the rotating control assembly.

5. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 1, characterized in that: The middle layer sludge removal mechanism (4) comprises a removal arc groove (41), a rotating shaft (42), a removal motor (43), a motor bracket (44) and an arc control board (45). The side of the sewage treatment tank (1) is provided with a removal arc groove (41). One end of the removal arc groove (41) is rotatably connected to a vertical rotating shaft (42). The rotating shaft (42) is located on one side of the removal arc groove (41) and is fixedly connected to one end of the arc control board (45). The top end of the rotating shaft (42) extends to the upper side of the sewage treatment tank (1) and is fixedly connected to the output shaft of the removal motor (43). The removal motor (43) is installed on the top of the sewage treatment tank (1) through the motor bracket (44).

6. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 5, characterized in that: The middle-layer sludge removal mechanism (4) further comprises a middle-layer sludge receiving box (46), a collecting bucket (47) and a transfer pipe (48). The middle-layer sludge receiving box (46) is fixedly connected to a position outside the sewage treatment tank (1) below the removal arc groove (41). The bottom of the middle-layer sludge receiving box (46) is fixedly connected to the top of the collecting bucket (47), and the bottom of the collecting bucket (47) is connected to the transfer pipe (48).

7. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 5, characterized in that: The arc groove gap sealing mechanism (5) includes a sealing arc plate (52), and a sealing arc plate (52) is provided on the outside of the sewage treatment tank (1) at a position corresponding to the removal of the arc groove (41). The top of the sealing arc plate (52) is fixedly connected to two sliding sleeves (53), and two horizontal sliding columns (51) are respectively slidably connected in the two sliding sleeves (53). One end of the two sliding columns (51) is fixedly connected to the outside of the sewage treatment tank (1), and the other ends of the two sliding columns (51) are respectively threadedly connected to the limiting nut (55), and the limiting nut (55) is located between the limiting nut (55) and the sliding sleeve (53). ) is sleeved with a compression spring (54), an arc groove (58) is provided at one end of the arc groove (41) close to the rotating shaft (42), an arc spreading rod (59) is fixedly connected to the end of the arc control plate (45) corresponding to the position of the arc groove (58), and the arc control plate (45) is rotatably mounted on one end of the arc spreading rod (59) away from the arc control plate (45), an arc sealing gasket (56) is provided on one side of the sealing arc plate (52) close to the sewage treatment tank (1), and an anti-wear notch (57) is provided in the area of the arc sealing gasket (56) corresponding to the arc groove (58).

8. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 1, characterized in that: The upper sludge discharge mechanism (6) includes a sludge pump (62), a lifting platform (65), a cyclone (66) and a sludge discharge height control component. Two vertical slide rails (63) are fixedly connected to the outer side of the top of the sewage treatment tank (1). Two sliders (64) are slidably connected in the two slide rails (63). The two sliders (64) are fixedly connected to the side of the lifting platform (65). The cyclone (66) and the sludge pump (62) are respectively installed on the lifting platform (65). The water outlet of the sludge pump (62) is connected to the inlet of the cyclone (66). The water inlet of the sludge pump (62) is fixedly connected to one end of the arched discharge pipe (61). The other end of the arched discharge pipe (61) extends to the inner side of the top of the sewage treatment tank (1). The bottom of the lifting platform (65) is connected to the sludge discharge height control component.

9. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 1, characterized in that: The apparatus further comprises a tray lifting limit mechanism (7), wherein the tray lifting limit mechanism (7) comprises a U-shaped frame (72), a lifting height control component and a limit switch (76), wherein the top of the sewage treatment tank (1) is provided with a U-shaped frame (72) via the lifting height control component, wherein the U-shaped frame (72) is located above the end of the lifting beam (24), and a limit switch (76) is installed in the middle of the lifting beam (24) at a position corresponding to the lifting beam (24).

10. The sludge screening device of the sequencing batch aerobic granular sludge technology according to claim 9, characterized in that: The support tray lifting limit mechanism (7) further includes a bent frame (77), a sealing retaining ring (78) and an annular protrusion (79). The inner wall of the sewage treatment tank (1) is vertically slidably connected to the sealing retaining ring (78). The bottom of the sealing retaining ring (78) is arranged with the annular protrusion (79). The top edge of the support tray (28) is provided with an annular sealing groove (210) corresponding to the support tray (28). The top of the sealing retaining ring (78) is fixedly connected to both sides of the U-shaped frame (72) through two bent frames (77), and the distance between the bottom of the limit switch (76) and the upper side of the lifting beam (24) is equal to the distance between the bottom of the sealing retaining ring (78) and the upper side of the support tray (28).

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