CN118545831A - Sewage treatment equipment applying activated sludge treatment technology - Google Patents

Abstract

The invention discloses a sewage treatment device using an activated sludge treatment process, belonging to the technical field of sewage treatment, comprising a reaction tank, a return pipe, a side conduit, a driving assembly and an aeration pipe. Two groups of guide grooves at the bottom of the reaction tank are respectively connected to a sewage inlet pipe and a sludge inlet pipe. The return pipe is rotatably arranged in the reaction tank. A plurality of side conduits are circumferentially arranged on the return pipe. A sleeve is rotatably sleeved on the side conduit. A piston is slidably arranged in the return pipe. The driving assembly is used to drive the rotation of the return pipe and the side conduit. The aeration pipe is rotatably arranged at the bottom of the reaction tank and is linked to the return pipe. A rotating cylinder is rotatably sleeved on the aeration pipe. The invention can capture the activated sludge floating on the liquid surface during the aeration process by rotatably arranging the return pipe and the side conduit in the reaction tank, and transport it to the bottom of the tank to be fully mixed with the sewage, thereby increasing the contact area between the activated sludge and the sewage. At the same time, the siltation problem caused by conventional aeration equipment can be avoided, thereby improving the sewage purification energy efficiency.

Description

A sewage treatment equipment using activated sludge treatment process

Technical Field

The invention belongs to the technical field of sewage treatment, and in particular relates to sewage treatment equipment using an activated sludge treatment process.

Background Art

Activated sludge is formed by a mixture of microbial communities such as bacteria, fungi, protozoa, and metazoa with suspended matter and colloidal substances in sewage. It is a flocculent sludge particle with strong adsorption and decomposition ability of organic matter and good sedimentation performance. It is called activated sludge because of its biochemical activity.

The activated sludge treatment process is essentially an artificial enhancement of the natural water body's self-purification function. It can remove dissolved and colloidal biodegradable organic matter from sewage, as well as suspended solids and other substances that can be adsorbed by activated sludge. It has the characteristics of wide adaptability to water quality and quantity, flexible and diverse operation modes, and good controllability. It has become the main body of biological treatment methods. The basic process flow of active sludge treatment is usually composed of grid filters, sediment filtration tanks, primary sedimentation tanks, aeration tanks, secondary sedimentation tanks, disinfection tanks, return systems, oxygen supply systems, and sludge recovery systems.

The traditional activated sludge method is also called the ordinary activated sludge method. It is the earliest operating mode of the activated sludge method. The aeration tank is in the shape of a rectangular corridor, and generally adopts multiple parallel corridors. Air diffusers are evenly laid on the bottom of the tank. Sewage and return sludge enter at the head of the aeration tank and flow to the tail end of the tank in the form of plug flow. In this process, the organic matter in the sewage is adsorbed by the activated sludge microorganisms and is gradually converted during the aeration process, so that it can be degraded. The aeration equipment used in the traditional activated sludge method usually relies on the diffuser aerator fixedly arranged at the bottom of the tank to connect the air pipeline for aeration. When the sludge is pushed along the bottom of the tank, it is easy to accumulate in the dead corner, and then form anaerobic sludge precipitation, resulting in excessive effluent ammonia nitrogen, and the suspension and dispersion effect of the sludge during the flow process is poor, which makes the utilization rate of the activated sludge low.

Summary of the invention

In view of the deficiencies in the prior art, an object of an embodiment of the present invention is to provide a sewage treatment device using an activated sludge treatment process to solve the problems in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

A sewage treatment device using an activated sludge treatment process comprises a reaction tank component, wherein the reaction tank component comprises a reaction tank, a first gear ring, a second gear ring, a sewage inlet pipe, a sludge inlet pipe and a guide groove, wherein the first gear ring and the second gear ring are fixedly arranged on the top of the reaction tank, and two groups of guide grooves are arranged at the bottom of the reaction tank, and the sewage inlet pipe and the sludge inlet pipe are connected to the two groups of guide grooves respectively;

A back-filter mechanism, the back-filter mechanism comprises a reflux pipe, a side conduit, an upper notch, a rotating shaft, a first transmission tooth, a screw, a sleeve, a second transmission tooth and a piston member, the reflux pipe is rotatably arranged in the reaction tank, and a plurality of side conduits are circumferentially mounted on the reflux pipe, the side conduit is connected to the reflux pipe and an upper notch is provided on the top of the side conduit, one end of the side conduit is also rotatably mounted with a rotating shaft, one end of the rotating shaft is fixedly mounted with a first transmission tooth, the first transmission tooth is meshed with a first gear ring, the other end of the rotating shaft is fixedly mounted with a screw, the screw is rotatably arranged in the side conduit, the side conduit is also limitedly rotatably sleeved with a sleeve, one side of the sleeve is fixedly mounted with a second transmission tooth, the second transmission tooth is meshed with the second gear ring, and a piston member is slidably mounted on the top of the reflux pipe;

A driving assembly, the driving assembly comprising a bracket, a driven disc, a crankshaft and a driving arm, the bracket being fixedly mounted on the return pipe and the side conduit, the driven disc being rotatably mounted on the bracket, the crankshaft being rotatably mounted on one side of the driven disc, the driving arm being rotatably sleeved on the crankshaft, the end of the driving arm being movably connected to the piston member to drive the reciprocating motion of the piston member;

The flow stirring mechanism includes an aeration pipe and a rotating drum. The aeration pipe is rotatably arranged at the bottom of the reaction tank and is linked to the return pipe. A plurality of aeration holes are arranged on the top of the aeration pipe. A rotating drum is also rotatably sleeved on the aeration pipe. The rotating drum is used to rotatably clean the sludge at the bottom of the reaction tank.

As a further solution of the present invention, the reaction tank component also includes an aeration main pipe, a rotating body and a third gear ring. The aeration main pipe is fixedly installed at the bottom of the reaction tank. The rotating body is rotatably sleeved on the aeration main pipe and fixedly connected to the reflux pipe. A plurality of aeration pipes are fixedly arranged circumferentially on the rotating body. The third gear ring is fixedly installed on the reaction tank.

As a further solution of the present invention, the two groups of guide grooves are arranged obliquely at the bottom of the reaction tank, the two groups of guide grooves are centrally symmetrical, and the arrangement direction of the two groups of guide grooves is parallel to the tangent direction of the inner diameter of the reaction tank and is located at a non-center position.

As a further solution of the present invention, the backfiltration mechanism also includes a scraper and a flow release port. The sleeve and the scraper are fixedly connected to form a spoon-shaped structure. A plurality of filtering slits are also arranged on the surface of the scraper. The flow release port is arranged on the bottom side of the reflux pipe and is arranged close to one side of the rotating body.

As a further solution of the present invention, the drive assembly also includes a transmission disk, a frame, a driver and a fixed gear disk, the transmission disk is fixedly mounted on one side of the driven disk, the frame is fixedly mounted on the reaction pool, the frame is equipped with a driver, the driver is assembled and connected to the bracket, and is used to drive the rotation of the bracket, and the frame is also fixedly equipped with a fixed gear disk, the fixed gear disk is meshed and connected with the transmission disk, and is used to drive the rotation of the driven disk.

As a further solution of the present invention, the reaction tank component also includes a curved ring, which is fixedly mounted on the inner wall of the reaction tank. The agitation mechanism also includes a spiral gear disk, a silt removal plate and an abutment. The spiral gear disk is limited and rotatably sleeved on the aeration pipe, and one end is meshed with the third gear ring, and the other end is elastically slidably connected with the rotating cylinder. The silt removal plate is fixedly mounted on the rotating cylinder, and the end of the rotating cylinder is also fixedly mounted with an abutment, and the abutment is arranged toward one side of the curved ring and is slidably connected with the curved ring.

As a further solution of the present invention, the flow stirring mechanism further comprises an annular groove, a plurality of annular grooves are arranged in an array on the rotating drum, aeration holes on the aeration pipe are arranged in an array, and the rotating drum is used to movably block the aeration holes arranged in the array.

In summary, compared with the prior art, the embodiments of the present invention have the following beneficial effects:

The present invention can capture the activated sludge floating on the liquid surface during aeration by rotatably disposing a reflux pipe and a side duct in the reaction tank, and transport it to the bottom of the tank to be fully mixed with sewage, thereby increasing the contact area between the activated sludge and sewage. At the same time, it can also avoid the siltation problem caused by conventional aeration equipment and improve the energy efficiency of sewage purification.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a sewage treatment device using an activated sludge treatment process provided in an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a sewage treatment device using an activated sludge treatment process provided in an embodiment of the present invention.

FIG. 3 is an enlarged schematic diagram of the reference numeral A in FIG. 2 .

FIG. 4 is an enlarged schematic diagram of the reference numeral B in FIG. 2 .

FIG5 is a schematic diagram of an aeration main pipe in a sewage treatment plant using an activated sludge treatment process according to an embodiment of the present invention.

FIG. 6 is an enlarged schematic diagram of the reference numeral C in FIG. 5 .

Figure numerals: 1-reaction tank component, 101-reaction tank, 102-first gear ring, 103-second gear ring, 104-drainage pipe, 105-sewage inlet pipe, 106-sludge inlet pipe, 107-guide groove, 108-aeration main pipe, 109-rotating body, 110-third gear ring, 111-curved ring, 2-return filter mechanism, 201-return pipe, 202-side guide tube, 203-upper notch, 204-rotating shaft, 205-first transmission tooth, 206-screw, 207- Sleeve, 208-scraper, 209-second transmission tooth, 210-piston, 211-flow outlet, 3-drive assembly, 301-bracket, 302-driven disk, 303-crankshaft, 304-drive arm, 305-transmission disk, 306-frame, 307-driver, 308-fixed tooth disk, 4-stirring mechanism, 401-aeration tube, 402-aeration hole, 403-rotating tooth disk, 404-rotating cylinder, 405-annular groove, 406-dredging plate, 407-abutment.

DETAILED DESCRIPTION

In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 6. In one embodiment of the present invention, a sewage treatment device using an activated sludge treatment process includes a reaction tank component 1, wherein the reaction tank component 1 includes a reaction tank 101, a first gear ring 102, a second gear ring 103, a sewage inlet pipe 105, a sludge inlet pipe 106 and a guide groove 107. The top of the reaction tank 101 is fixedly provided with the first gear ring 102 and the second gear ring 103, and the bottom of the reaction tank 101 is provided with two groups of guide grooves 107, and the two groups of guide grooves 107 are respectively connected to the sewage inlet pipe 105 and the sludge inlet pipe 106; a backfiltration mechanism 2, wherein the backfiltration mechanism 2 includes a reflux pipe 201, a side guide The reflux pipe 201 is rotatably arranged in the reaction tank 101, and a plurality of side conduits 202 are circumferentially mounted on the reflux pipe 201. The side conduits 202 are connected to the reflux pipe 201 and an upper notch 203 is provided on the top of the side conduits 202. The side conduits 202 are also rotatably mounted with a reflux pipe 202. The reflux pipe 201 is fixedly mounted with a first transmission tooth 205 at one end of the reflux pipe 204. The first transmission tooth 205 is meshed with the first gear ring 102. The reflux pipe 201 is rotatably arranged in the reaction tank 101, and a plurality of side conduits 202 are circumferentially mounted on the reflux pipe 201. The side conduits 202 are connected to the reflux pipe 201 and an upper notch 203 is provided on the top of the side conduits 202. The side conduits 202 are also rotatably mounted with a reflux pipe 204. The first transmission tooth 205 is meshed with the first gear ring 102. The reflux pipe 201 is rotatably mounted with a reflux pipe 202 and a first transmission tooth 205 is fixedly mounted on one end of the reflux pipe 204. The first transmission tooth 205 is meshed with the first gear ring 102. The other end is fixedly equipped with a screw 206, and the screw 206 is rotatably arranged in the side conduit 202. The side conduit 202 is also provided with a sleeve 207 for limiting rotation. A second transmission tooth 209 is fixedly equipped on one side of the sleeve 207. The second transmission tooth 209 is meshed with the second gear ring 103. A piston member 210 is also slidably equipped on the top of the return pipe 201; a driving component 3, the driving component 3 includes a bracket 301, a driven disk 302, a crankshaft 303 and a driving arm 304. The bracket 301 is fixedly equipped on the return pipe 201 and the side conduit 202, and a driven disk 302 is rotatably equipped thereon. A crankshaft 303 is rotatably mounted on one side of the moving disk 302, and a driving arm 304 is rotatably sleeved on the crankshaft 303. The end of the driving arm 304 is movably connected to the piston member 210 to drive the reciprocating motion of the piston member 210; a stirring mechanism 4, the stirring mechanism 4 includes an aeration pipe 401 and a rotating cylinder 404. The aeration pipe 401 is rotatably arranged at the bottom of the reaction tank 101 and is linked to the return pipe 201. A plurality of aeration holes 402 are arranged on the top of the aeration pipe 401. A rotating cylinder 404 is also rotatably sleeved on the aeration pipe 401. The rotating cylinder 404 is used to rotate and clean the sludge at the bottom of the reaction tank 101.

In actual application of this embodiment, when the activated sludge sewage treatment equipment is used to biologically treat sewage, the organic sewage after primary sedimentation and the return sludge in the secondary sedimentation tank are input into the tank body of the reaction tank 101 through the sewage inlet pipe 105 and the sludge inlet pipe 106 arranged at the bottom of the reaction tank 101, so that the sewage and the activated sludge are output longitudinally from the bottom of the tank. At the same time, the return pipe 201 and the side guide pipe 202 rotate around the fixed axis under the driving action. During the rotation, the aeration pipe 401 connected to the aeration equipment rotates with the return pipe 201, so that oxygen is transported through the aeration A plurality of aeration holes 402 on the surface of the tube 401 release into the sewage, and the rotating drum 404 rotatably mounted on the aeration tube 401 can stir the sludge accumulated at the bottom of the pool, mix it with the bubble flow, and float toward the liquid surface following the bubbles. The activated sludge in the floc state is continuously washed by the bubbles and the liquid flow during the floating process, thereby being dispersed into biological flocs with smaller diameters, which are then combined with organic matter in the sewage to reduce the BOD load of the sewage, and the reacted sewage and the activated sludge components therein are discharged to the secondary sedimentation tank through the discharge pipe 104 on the liquid surface side for separation. The device can maintain the dissolved oxygen content of the sewage entering the pool through continuous aeration, thereby ensuring the continuous iteration of aerobic bacteria in the return sludge, and when the return sludge is suspended and distributed in the tank body of the reaction tank 101, some floccules that are not combined with organic matter float to the upper layer of the liquid surface, and the side conduit 202 rotates circumferentially at the liquid surface end, and the sleeve 207 rotatably sleeved on the side conduit 202 can rotate and filter the activated sludge floating on the upper layer of the liquid surface to the upper notch 203, and when the side conduit 202 rotates in the reaction tank 101, the first transmission tooth 205 at one end of the side conduit 202 can drive the screw 206 in the process of meshing with the first gear ring 102 It rotates continuously so that the sludge dropped into the upper notch 203 moves toward the return pipe 201 under the push of the screw 206, and the piston member 210 movably assembled at one end of the return pipe 201 can continuously press the sludge collected in the side conduit 202 into the return pipe 201 under the driving action of the driving component 3, and make the sludge return to the side of the bottom of the pool, so that the activated sludge can be repeatedly adsorbed by microorganisms, and the suspended amount of activated sludge in the pool body is increased to fully contact the organic components in the sewage, thereby improving the sewage purification efficiency. At the same time, it can also avoid the defect of easy siltation in traditional aeration pipes, and prevent anaerobic sludge accumulated in the dead corners of the pipeline from causing high ammonia nitrogen in the effluent.

Please refer to Figures 2, 4 and 5. In a preferred embodiment of the present invention, the reaction tank component 1 also includes an aeration main pipe 108, a rotating body 109 and a third gear ring 110. The aeration main pipe 108 is fixedly assembled at the bottom of the reaction tank 101. The rotating body 109 is rotatably sleeved on the aeration main pipe 108 and fixedly connected to the reflux pipe 201. A plurality of aeration pipes 401 are fixedly arranged circumferentially on the rotating body 109. The third gear ring 110 is fixedly assembled on the reaction tank 101.

In actual application of this embodiment, the aeration main pipe 108 is arranged at the bottom of the reaction tank 101, and the oxygen components required for the iteration of aerobic bacteria can be introduced into the reaction tank 101. The rotor 109 can be assembled on the aeration main pipe 108 through a rotating sealing valve core to keep the rotor 109 sealed during the rotation of the aeration main pipe 108, and the rotor 109 is connected to a plurality of aeration pipes 401, so that when the rotor 109 rotates, oxygen can be released into the tank body through a plurality of aeration holes 402 on the aeration pipes 401.

Please refer to Figure 2. In a preferred embodiment of the present invention, the two groups of guide grooves 107 are arranged obliquely at the bottom of the reaction pool 101, the two groups of guide grooves 107 are centrally symmetrical, and the arrangement directions of the two groups of guide grooves 107 are parallel to the tangent direction of the inner diameter of the reaction pool 101 and are located at non-center positions.

In actual application of this embodiment, the two groups of guide grooves 107 are arranged obliquely in the reaction tank 101, so that the sewage and activated sludge are output to the reaction tank 101 along the oblique direction, and the layout direction of the guide groove 107 is parallel to the tangent direction of the inner diameter of the reaction tank 101 and is located at a non-center position. Its main purpose is to make the sewage output from the sewage inlet pipe 105 impact the inner wall of the reaction tank 101 along the tangent direction, so that the sewage in the reaction tank 101 forms a vortex, so that the organic components contained in the sewage move nonlinearly but in a curved path when following the upwelling of the fluid. On the one hand, it increases its movement time in the tank body to ensure sufficient aeration, and on the other hand, it can cooperate with the stirring of the floating bubbles to make the bubbles evenly mixed with the sludge, so that the sludge components are placed in the tank body in a dispersed suspended state.

Please refer to Figure 3. In a preferred embodiment of the present embodiment, the backfiltration mechanism 2 also includes a scraper 208 and a flow release port 211. The sleeve 207 and the scraper 208 are fixedly connected to form a spoon-shaped structure. A plurality of filtering slits are also arranged on the surface of the scraper 208. The flow release port 211 is arranged on the bottom side of the reflux pipe 201 and is arranged close to one side of the rotating body 109.

In actual application of this embodiment, the sleeve 207 and the scraper 208 form a spoon-shaped structure. The second transmission tooth 209 on one side of the sleeve 207 drives the sleeve 207 to rotate on the liquid surface during the process of meshing with the second gear ring 103. The sludge floating on the liquid surface can be scooped up and drained through the filter gap. The sludge is poured into the upper groove 203 by gravity during rotation. With the driving action of the screw 206, the sludge components are transported back to the bottom of the pool along the reflux pipe 201, so that the sludge can be evenly dispersed in the pool body and fully contact with organic matter.

Please refer to Figure 6. In a preferred embodiment of the present invention, the driving assembly 3 also includes a transmission disk 305, a frame 306, a driver 307 and a fixed gear disk 308. The transmission disk 305 is fixedly assembled on one side of the driven disk 302. The frame 306 is fixedly assembled on the reaction pool 101. The frame 306 is equipped with a driver 307. The driver 307 is assembled and connected with the bracket 301 to drive the rotation of the bracket 301. The frame 306 is also fixedly assembled with a fixed gear disk 308. The fixed gear disk 308 is meshed and connected with the transmission disk 305 to drive the rotation of the driven disk 302.

In actual application of this embodiment, since the frame 306 is fixedly mounted on the reaction pool 101, the driver 307 can drive the support 301 to rotate as a whole during the rotation process, thereby driving the reflux pipe 201 and the side conduit 202 to rotate synchronously. Since the fixed toothed disc 308 is fixedly mounted on the frame 306, the drive disc 305 at one end of the driven disc 302 can drive the crankshaft 303 to rotate in the process of meshing with the fixed toothed disc 308 during the rotation of the support 301. The drive arm 304 sleeved on the crankshaft 303 and the drive disc 305 form a crankshaft. The handle rocker structure can drive the piston member 210 to slide back and forth on one side of the return pipe 201 during the reciprocating motion, and when the piston member 210 is at the highest point, the bottom of the piston member 210 is away from one end of the side conduit 202, so that the sludge components in the side conduit 202 can be connected to the return pipe 201 and continuously rotated into the return pipe 201. The sludge components in the return pipe 201 can be moved along the return pipe 201 to the side of the release port 211 through the pressing of the piston member 210, and released to the bottom of the pool through the release port 211, so as to realize the circulation motion of the sludge in the aeration stage.

Please refer to Figures 2 and 4. In a preferred embodiment of the present invention, the reaction tank component 1 also includes a curved ring 111, which is fixedly mounted on the inner wall of the reaction tank 101. The agitation mechanism 4 also includes a spiral toothed disk 403, a silt removal plate 406 and an abutment 407. The spiral toothed disk 403 is limitedly rotatably sleeved on the aeration pipe 401, and one end is meshed with the third toothed ring 110, and the other end is elastically slidably connected with the rotating cylinder 404. The silt removal plate 406 is fixedly mounted on the rotating cylinder 404, and the end of the rotating cylinder 404 is also fixedly mounted with an abutment 407, and the abutment 407 is arranged toward one side of the curved ring 111 and is slidably connected with the curved ring 111.

In actual application of this embodiment, since the spiral toothed disk 403 is rotatably sleeved on the aeration pipe 401, one end of the spiral toothed disk 403 is meshed with the third gear ring 110 and rotates during the rotation process, and the other end drives the rotating drum 404 thereon to rotate synchronously. When the rotating drum 404 rotates, the silt-collecting plates 406 thereon can be used to continuously scrape the silt components on the bottom of the pool, so that the sludge floats toward the liquid surface layer, and after leaving the bottom of the pool, it contacts the bubbles generated by aeration, so that the sludge components are quickly dispersed into the sewage, preventing the accumulation of anaerobic mud balls in dead corners, resulting in higher ammonia nitrogen in the effluent of the sewage, affecting the subsequent effluent quality.

Please refer to Figure 4. In a preferred embodiment of the present invention, the stirring mechanism 4 also includes an annular groove 405. A plurality of annular grooves 405 are arranged in an array on the rotating cylinder 404. The aeration holes 402 on the aeration tube 401 are arranged in an array. The rotating cylinder 404 is used to flexibly block the aeration holes 402 arranged in an array.

In actual application of this embodiment, when the aeration tube 401 rotates in the reaction tank 101 following the rotating body 109, the abutment member 407 on the end side of the rotating cylinder 404 can push the rotating cylinder 404 to slide back and forth during the elastic sliding contact with the curved ring 111, so that any annular groove 405 can slide back and forth between two adjacent groups of aeration holes 402, thereby making the two adjacent aeration holes 402 intermittently connected and allowing bubbles to be discharged intermittently, which can increase the mixing effect of the bubbles on the one hand, and on the other hand, the reciprocating sliding of the rotating cylinder 404 can scrape the through-hole position of the aeration hole 402 to prevent silt from blocking the air hole and avoid uneven oxygen supply in the tank body.

The above-mentioned embodiment of the present invention provides a sewage treatment equipment using an activated sludge treatment process, and by rotatably disposing a return pipe 201 and a side conduit 202 in a reaction tank 101, the activated sludge floating on the liquid surface during the aeration process can be captured and transported to the bottom of the tank to be fully mixed with the sewage, thereby increasing the contact area between the activated sludge and the sewage. At the same time, it can also avoid the siltation problem caused by conventional aeration equipment and improve the energy efficiency of sewage purification.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A sewage treatment apparatus employing an activated sludge treatment process, the sewage treatment apparatus employing an activated sludge treatment process comprising:

The reaction tank component comprises a reaction tank, a first toothed ring, a second toothed ring, a sewage inlet pipe, a sludge inlet pipe and guide grooves, wherein the first toothed ring and the second toothed ring are fixedly arranged on the tank top of the reaction tank, two groups of guide grooves are arranged on the bottom of the reaction tank, and the two groups of guide grooves are respectively connected with the sewage inlet pipe and the sludge inlet pipe;

The back filtering mechanism comprises a back pipe, a side guide pipe, an upper notch, a rotating shaft, first transmission teeth, a screw rod, a sleeve, second transmission teeth and a piston member, wherein the back pipe is rotationally arranged in a reaction tank, a plurality of side guide pipes are circumferentially assembled on the back pipe, the side guide pipes are communicated with the back pipe, the upper notch is formed in the top of each side guide pipe, one end of each side guide pipe is rotationally assembled with the rotating shaft, one end of each rotating shaft is fixedly assembled with the first transmission teeth, the first transmission teeth are meshed with the first toothed ring and connected with each other, the other end of each rotating shaft is fixedly assembled with the screw rod, the screw rod is rotationally arranged in the corresponding side guide pipe, the sleeve is further sleeved by a limiting rotation sleeve, one side of the sleeve is fixedly assembled with the second transmission teeth, the second transmission teeth are meshed with the second toothed ring, and the piston member is also slidingly assembled on the top of the back pipe;

The driving assembly comprises a bracket, a driven disc, a crankshaft and a driving arm, wherein the bracket is fixedly assembled on the return pipe and the side guide pipe, the driven disc is rotatably assembled on the bracket, the crankshaft is rotatably assembled on one side of the driven disc, the driving arm is rotatably sleeved on the crankshaft, and the tail end of the driving arm is movably connected with the piston part to drive the piston part to reciprocate;

the stirring mechanism comprises an aeration pipe and a rotary cylinder, the aeration pipe is rotationally arranged at the bottom of the reaction tank and is connected with the return pipe in a linkage manner, a plurality of aeration holes are arranged at the top of the aeration pipe, the rotary cylinder is further rotationally sleeved on the aeration pipe, and the rotary cylinder is used for rotationally cleaning sludge at the bottom of the reaction tank.

2. The sewage treatment device applying the activated sludge treatment process according to claim 1, wherein the reaction tank component further comprises an aeration main pipe, a revolving body and a third toothed ring, the aeration main pipe is fixedly assembled at the bottom of the reaction tank, the revolving body is rotatably sleeved on the aeration main pipe and fixedly connected with the return pipe, a plurality of aeration pipes are fixedly arranged on the revolving body in the circumferential direction, and the third toothed ring is fixedly assembled on the reaction tank.

3. The sewage treatment apparatus using activated sludge treatment process according to claim 1, wherein the two sets of guide grooves are arranged at the bottom of the reaction tank in an inclined manner, the two sets of guide grooves are centrosymmetric, and the arrangement direction of the two sets of guide grooves is parallel to the tangential direction of the inner diameter of the reaction tank and is positioned at the non-center position.

4. The sewage treatment device applying the activated sludge treatment process according to claim 1, wherein the back filtering mechanism further comprises a scraping plate and a releasing port, the sleeve and the scraping plate are fixedly connected and form a spoon-shaped structure, a plurality of filtering slits are further arranged on the surface of the scraping plate, and the releasing port is arranged on the bottom side of the return pipe and is arranged close to one side of the revolving body.

5. The sewage treatment apparatus using an activated sludge treatment process according to claim 1, wherein the driving assembly further comprises a driving plate fixedly assembled to one side of the driven plate, a frame fixedly assembled to the reaction tank, a driver assembled to the frame, the driver assembled to the bracket for driving the bracket to rotate, and a fixed fluted plate engaged to the driving plate for driving the driven plate to rotate.

6. The sewage treatment device applying the activated sludge treatment process according to claim 1, wherein the reaction tank component further comprises a curved ring, the curved ring is fixedly assembled on the inner wall of the reaction tank, the stirring mechanism further comprises a rotary fluted disc, a dredging plate and an abutting piece, the rotary fluted disc is limited and rotatably sleeved on the aeration pipe, one end of the rotary fluted disc is meshed with the third toothed ring, the other end of the rotary fluted disc is elastically and slidably connected with the rotary drum, the dredging plate is fixedly assembled on the rotary drum, the abutting piece is fixedly assembled at the tail end of the rotary drum, and the abutting piece is arranged towards one side of the curved ring and is slidably connected with the curved ring.

7. The sewage treatment apparatus using an activated sludge treatment process according to claim 1, wherein the stirring mechanism further comprises annular grooves, a plurality of annular grooves are arranged on the rotary drum in an array manner, aeration holes on the aeration pipe are arranged in an array manner, and the rotary drum is used for movably plugging the aeration holes arranged in the array manner.