Sewage treatment system capable of flexibly switching AOA and AOAO

Abstract

The invention discloses a sewage treatment system capable of flexibly switching AOA and AOAO, and relates to the technical field of sewage treatment.The sewage treatment system comprises an AOA sewage treatment pool set, the AOA sewage treatment pool set comprises an anaerobic pool, an aerobic pool and an anoxic pool, and further comprises an anaerobic pool reaction promoting mechanism and an anti-impact secondary sedimentation pool mechanism, the anaerobic pool reaction promoting mechanism comprises a rotary drum, and the rotary drum is connected with the anaerobic pool reaction promoting mechanism; the sewage treatment system comprises an anaerobic tank, a plurality of supports are arranged at the top of the anaerobic tank at equal intervals, the middle of each support is rotatably connected with a vertical rotating drum through a bearing, the top of each rotating drum is connected with a rotating power assembly, and three mounting sleeves are arranged on the peripheral side of the bottom of each rotating drum in an annular array mode. The two sewage treatment modes of AOA and AOAO can be flexibly switched according to the sludge sedimentation condition in the secondary sedimentation tank, the sludge turning phenomenon in the secondary sedimentation tank can be avoided, meanwhile, the sewage treatment energy consumption is reduced, and the sewage treatment efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment system in which AOA and AOAO can be flexibly switched. Background Art

[0002] At present, in order to solve the problems of low efficiency of simultaneous nitrogen removal and phosphorus removal, high operating energy consumption, and large amount of carbon source addition in sewage treatment, the AOA sewage treatment system has become a hot topic in the current sewage treatment field. The AOA sewage treatment system is composed of an anaerobic zone, an aerobic zone, an anoxic zone, and a sedimentation tank in series. Its process does not require nitrification liquid reflux, and it also has a good denitrification and phosphorus removal effect for urban low carbon nitrogen ratio domestic sewage. Due to the low dissolved oxygen in the anoxic tank in the AOA sewage treatment system, the sludge entering the sedimentation tank forms nitrogen due to denitrification reaction, resulting in mud turning in the sedimentation tank. Therefore, the prior art has proposed an AOAO sewage treatment system, which adds a post-aerobic zone between the anoxic zone and the sedimentation tank. The post-aerobic zone performs indiscriminate aeration treatment on the sewage coming out of the anoxic zone, which increases energy consumption and affects the sewage treatment efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a sewage treatment system that can flexibly switch between AOA and AOAO. The system can flexibly switch between the two sewage treatment modes of AOA and AOAO according to the sludge settling conditions in the secondary sedimentation tank, thereby avoiding the mud turning over in the secondary sedimentation tank. At the same time, it is beneficial to reduce the energy consumption of sewage treatment, improve the sewage treatment efficiency, and effectively solve the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a sewage treatment system with flexible switch between AOA and AOAO, comprising an AOA sewage treatment tank group, wherein the AOA sewage treatment tank group comprises an anaerobic tank, an aerobic tank and an anoxic tank, wherein the anaerobic tank, the aerobic tank and the anoxic tank are connected in series in sequence through a pump assembly, and further comprising: The anaerobic tank reaction promotion mechanism comprises a bracket, a rotating drum, a mounting sleeve, a water spray radial pipe, a tangential nozzle, a rotating power assembly and a nozzle pitch control assembly. A plurality of brackets are arranged at equal distances on the top of the anaerobic tank. The middle of each bracket is respectively rotatably connected to a vertical rotating drum. The top of each rotating drum is respectively connected to a rotating power assembly. The bottom of the rotating drum extends into the anaerobic tank. Three mounting sleeves are respectively arranged in a circular array on the outer peripheral side of the bottom of each rotating drum. Each mounting sleeve is respectively rotatably connected to one end of a water spray radial pipe. The other end of the water spray radial pipe is provided with a tangential nozzle. The side of the water spray radial pipe is connected to the nozzle pitch control assembly. The impact-resistant secondary sedimentation tank mechanism has an anaerobic tank and an anoxic tank connected to the bottom through a sludge return mechanism, and the anoxic tank is connected to the impact-resistant secondary sedimentation tank mechanism through a pump water assembly.

[0005] The anaerobic tank, aerobic tank and anoxic tank are connected in series through the pump assembly in sequence. The sewage enters the water spray radial pipe through the drum and the installation sleeve, and then is sprayed into the anaerobic tank through the tangential nozzle. The sludge return mechanism returns the sludge precipitated in the impact-resistant secondary sedimentation tank mechanism to the anaerobic tank. The rotating power assembly drives the drum to rotate relative to the bracket and the anaerobic tank. The drum drives the water spray radial pipe and the tangential nozzle to mix the sludge returned to the anaerobic tank with the sewage in the anaerobic tank. The denitrifying bacteria in the sludge use the organic matter in the sewage to denitrify, and part of the organic matter is converted into internal Carbon source and phosphate are released. The stirring of the sludge and sewage mixture by the water spray radial pipe and tangential nozzle is conducive to the adsorption and absorption of organic matter in the sewage by anaerobic microorganisms. The nozzle pitch control component can change the pitch angle of the tangential nozzle. The water spray angle can be continuously changed during the rotation of the tangential nozzle, which is conducive to further improving the stirring effect of the sludge and sewage mixture. Then the sewage sludge mixture in the anaerobic tank is sent to the aerobic tank through the pump water component. The aeration device in the aerobic tank aerates the mud-water mixture, and aerobic reaction occurs in the aerobic tank. Oxygen absorption phosphorus reaction, nitrification reaction and synchronous nitrification and denitrification reaction, generate nitrate and absorb phosphorus at the same time, then the muddy water mixture in the aerobic tank is sent to the anoxic tank through the pump water component, the sludge return mechanism returns the sludge precipitated in the impact-resistant secondary sedimentation tank mechanism to the anoxic tank, completes the return of nitrate to the anoxic tank, denitrification and nitrogen removal in the anoxic tank, then the muddy water mixture in the anoxic tank is sent to the impact-resistant secondary sedimentation tank mechanism through the pump water component, let the sludge in the muddy water mixture settle, if the denitrification reaction occurs in the impact-resistant secondary sedimentation tank mechanism If the sludge settling performance deteriorates due to the formation of nitrogen, the sewage is subjected to secondary aeration treatment when added to the impact-resistant secondary sedimentation tank mechanism to supply oxygen to the mud-water mixture, inhibit the denitrification reaction of the sewage in the sludge sedimentation chamber in the impact-resistant secondary sedimentation tank mechanism, reduce the generation of nitrogen, improve the sludge settling performance, and avoid mud overturning in the secondary sedimentation tank. If there is no mud overturning in the impact-resistant secondary sedimentation tank mechanism during the operation of the sewage treatment system, no secondary aeration treatment is performed, or the sewage treatment time required for aeration is reduced, thereby saving energy consumption.

[0006] Furthermore, the nozzle pitch control assembly includes a follow-up frame, an electric telescopic rod, a synchronous ring, a push-pull rod and a convex rod. The rotating drum is located at the lower side of the bracket and is fixedly sleeved with the follow-up frame. The bottoms of both ends of the follow-up frame are respectively fixedly connected to the top ends of the two electric telescopic rods, and the bottom ends of the two electric telescopic rods are respectively fixedly connected to the two sides of the synchronous ring. The bottom of the synchronous ring is movably connected to the top ends of the three push-pull rods. The sides of each water spray radial pipe are respectively provided with convex rods, and the bottom ends of the three push-pull rods are respectively movably connected to the corresponding convex rod ends.

[0007] The follower frame rotates with the drum, and the electric telescopic rod extends to push the convex rod downward through the push-pull rod. The convex rod drives the water spray radial pipe to rotate relative to the drum through the mounting sleeve, so that the tangential nozzle at the end of the water spray radial pipe can be gradually lifted upward. The electric telescopic rod is shortened, and the push-pull rod and the convex rod can be used to make the water spray radial pipe rotate in the opposite direction, so that the tangential nozzle at the end of the water spray radial pipe can be gradually moved downward, thereby changing the pitch angle of the tangential nozzle, allowing the tangential nozzle to spray water into the anaerobic tank at different pitch angles, thereby promoting the flow of sewage in the anaerobic tank by spraying water, and promoting The sewage sludge entering the anaerobic tank is fully mixed, and the change of the pitch angle of the tangential nozzle cooperates with the rotation of the drum and the water spraying radial pipe to promote the stirring and mixing of the sewage sludge. Since the electric telescopic rod needs to be powered to control the extension and retraction of the electric telescopic rod, if the electric telescopic rod is directly connected by a cable, the cable will be broken as the drum rotates. Therefore, a conductive slip ring can be set on the top of the drum, which is specially used to transmit power supply and signal power supply during unlimited continuous rotation. With the help of the conductive slip ring, the electric telescopic rod can be powered and controlled while rotating.

[0008] Furthermore, the anaerobic tank reaction promotion mechanism also includes a circulating liquid pump, the top of each rotating drum is connected to one end of the arched tube through a rotating joint, the other end of each arched tube is connected to the outlet of the circulating liquid pump, the inlet of each circulating liquid pump is connected to one end of the filling pipe, and the filling pipe is equipped with a solenoid valve 1. The inlet of each circulating liquid pump is also connected to one end of the circulating extraction pipe, the other end of the circulating extraction pipe is connected to the anaerobic tank, and the circulating extraction pipe is equipped with a solenoid valve 2. The filling pipe is connected to the external sewage source, the electromagnetic valve 2 is closed, the electromagnetic valve 1 is opened, and the circulating liquid pump works to send the external sewage source into the drum through the filling pipe, the arch pipe and the rotary joint, and then send it into the anaerobic tank through the water spraying radial pipe and the tangential nozzle. When the amount of sewage in the anaerobic tank is sufficient, the electromagnetic valve 2 is opened, the electromagnetic valve 1 is closed, and the circulating liquid pump continues to work, which can complete the circulation and mixing of the sewage in the anaerobic tank. The sewage in the anaerobic tank is pumped out and then sent back into the anaerobic tank through the water spraying radial pipe and the tangential nozzle. With the rotation of the water spraying radial pipe and the tangential nozzle and the pitching activity of the tangential nozzle, the sewage in the anaerobic tank is fully mixed with the returned sludge, which promotes the denitrifying bacteria in the sludge to use the organic matter in the sewage for denitrification, and some of the organic matter is converted into internal carbon source, which accelerates the release of phosphate. A capping component can be added to the top of the anaerobic tank as needed to seal the top of the anaerobic tank, and methane and other gases generated during the reaction can be collected at the top of the anaerobic tank.

[0009] Furthermore, the impact-resistant secondary sedimentation tank mechanism includes a circular tank body, a mud collecting trough, a frustum-shaped tank bottom, and a secondary sedimentation tank peripheral water inlet and outlet assembly. The bottom of the circular tank body is provided with a frustum-shaped tank bottom, the bottom center of the frustum-shaped tank bottom is provided with a mud collecting trough, and the secondary sedimentation tank peripheral water inlet and outlet assembly is installed inside the circular tank body. The circular tank body, the mud collecting trough, and the frustum-shaped tank bottom constitute a basic secondary sedimentation tank structure. The secondary sedimentation tank peripheral water inlet and outlet assembly allows the mud-water mixture to enter from the peripheral bottom of the secondary sedimentation tank structure, and then allows the upper layer of clean water to be discharged from the peripheral top of the secondary sedimentation tank structure, which is conducive to increasing the water inlet section, making the water distribution more uniform, and is conducive to improving the volume utilization rate of the sedimentation tank, and can also increase its surface load.

[0010] Furthermore, the peripheral inlet and outlet water assembly of the secondary sedimentation tank includes an inner tank body, a circular inner tank body is arranged on the inner side of the circular tank body, the inner area of ​​the inner tank body is a sludge sedimentation chamber, an annular cavity is formed between the circular tank body and the inner tank body, and a peripheral water inlet is arranged in a circular array at the bottom of the inner tank body, an annular outlet channel is arranged on the inner side of the inner tank body, the outlet channel is connected to one end of a clean water pipe, and the other end of the clean water pipe extends to the outside of the circular tank body.

[0011] The mud-water mixture in the anoxic tank is sent to the annular cavity through the pump assembly. The mud-water mixture in the annular cavity enters the sludge sedimentation chamber through multiple peripheral water inlets. The peripheral water inlets serve as a water distribution structure, allowing the mud-water mixture to enter the bottom of the sludge sedimentation chamber more evenly and quickly diffuse in front of the sludge sedimentation chamber, entering the clarification area on the upper layer from the bottom of the sludge sedimentation chamber at the lowest speed. Since the water inlet speed is very small, the short-circuit phenomenon usually associated with high-speed water inlet can be avoided, thereby improving the effective utilization coefficient of the tank volume. Since the mud-water mixture presents a plane and slowly rises in the sludge sedimentation chamber, the activated sludge in the suspended layer flocculates and condenses, so that the activated sludge particles in the mixed liquid continuously collide, adsorb, flocculate, and combine with the activated sludge in the suspended layer, producing a good suspension clarification effect, thereby improving the sludge sedimentation efficiency of the sedimentation tank. The clear water on the upper layer of the sludge sedimentation chamber passes over the top inner edge of the outlet channel and enters the outlet channel, and then is discharged through the clean water pipe.

[0012] Furthermore, the impact-resistant secondary sedimentation tank mechanism also includes an annular partition, a downcomer and a downcomer control solenoid valve. An annular partition is provided between the outer side of the circular tank body and the outer side of the inner tank body. The annular partition divides the annular cavity into an impact-resistant aerobic zone on the upper side and a filling zone on the lower side. A vertical downcomer is provided in an annular array on the annular partition, and a downcomer control solenoid valve is installed in the middle of the downcomer. When the mud-water mixture in the anoxic tank is sent into the sludge sedimentation chamber, in order to quickly empty the anoxic tank for the treatment of the next pool of sewage, the mud-water mixture will quickly pass through the annular cavity and the surrounding water inlet into the sludge sedimentation chamber. At this time, the load in the sludge sedimentation chamber exceeds the standard and will be subjected to a greater impact. The sludge in the sludge sedimentation chamber will not have time to settle. Therefore, the annular cavity is divided into an impact-resistant aerobic zone and a filling zone by an annular partition. The mud-water mixture first enters the impact-resistant aerobic zone for temporary storage, and then is gradually allowed to pass through the filling zone through the control of the downcomer and the downcomer control solenoid valve. The water enters the sludge settling chamber through the surrounding water inlets, slowing down the speed of adding water in the sludge settling chamber. The shock-resistant aerobic zone plays a buffering role against water volume fluctuations. If mud turning over occurs in the sludge settling chamber, the sewage in the shock-resistant aerobic zone will be aerated to inhibit the denitrification reaction of the sewage in the sludge settling chamber and improve the sludge settling performance. The shock-resistant aerobic zone plays a temporary storage role and also serves as a post-aerobic zone. It can aerate the mud-water mixture entering the sludge settling chamber as needed, thereby realizing flexible switching of AOA and AOAO treatment processes.

[0013] Furthermore, it also includes a slow-flow overflow mechanism, which includes a water outlet weir, overflow retaining teeth, an annular fender and an annular filter screen. The inner peripheral side of the water outlet channel is provided with a water outlet weir, and the inner and outer edges of the top of the water outlet weir are respectively provided with overflow retaining teeth in an annular array. The inner peripheral side of the water outlet weir is provided with an annular fender, and the upper outer edge of the annular fender is detachably installed with an annular filter screen. The annular fender guides the rising water flow, and the clean water in the upper layer of the sludge sedimentation chamber passes over the upper edge of the annular fender, and then is filtered by the annular filter screen, and then passes over the overflow retaining teeth into the water outlet weir, and finally enters the water outlet channel, wherein the annular filter screen can filter the scum that occasionally appears, and the overflow retaining teeth are used for the uniform outflow of water flow to avoid the floating of sludge caused by the rising flow of local water flow too fast.

[0014] Furthermore, it also includes a pool bottom scraping mechanism, which includes a gallery bridge, a scraping motor, a scraping shaft, a side rod and a scraper. The top of the circular pool body is provided with a gallery bridge, the middle part of the gallery bridge is rotatably connected with a vertical scraping shaft, the top of the scraping shaft is fixedly connected with the output shaft of the scraping motor, the scraping motor is installed on the gallery bridge, and the bottom of the scraping shaft is connected with two scrapers through two side rods. The gallery bridge is used to install the scraping motor and the scraping shaft. The gallery bridge is also convenient for the staff to walk to the top of the circular pool body to observe the operation of the circular pool body, and it is also convenient to maintain the circular pool body. The scraping motor drives the scraping shaft to rotate, and the scraping shaft drives the scraper to rotate through the side rod. The scraper is used to scrape the sludge attached to the upper side of the frustum-shaped pool bottom, so that the sludge falls into the sludge collecting tank, which is convenient for being discharged by the sludge pump, so as to avoid the sludge staying at the bottom of the pool for too long and anaerobic decomposition, and to avoid the sludge floating in the form of blocks due to the gas produced by anaerobic.

[0015] Furthermore, it also includes a floating mud collection and cleaning mechanism, which includes a collection bucket, the scraper shaft is fixedly connected to one end of the spoke rod through a fixed sleeve, the collection bucket is evenly provided with leakage holes, and the collection bucket is located on the upper side of the annular mud guard, and a disassembly block is installed on the side of the collection bucket, and the disassembly block is detachably connected to the other end of the spoke rod. If suspended sludge appears, the suspended sludge will be filtered out by the annular filter screen, and the accumulation of suspended sludge will affect the discharge efficiency of clean water. Therefore, during the scraping process, the scraper shaft drives the collection bucket to rotate on the upper side of the annular mud guard through the fixed sleeve and the spoke rod, and the collection bucket can collect the floating sludge filtered out by the annular filter screen. A sinking port can be set on the corridor bridge, and when the collection bucket rotates to below the sinking port, the staff can take out the floating sludge in the collection bucket through the sinking port, and the disassembly block is set to facilitate the collection bucket to be removed from the end of the spoke rod.

[0016] Furthermore, it also includes an aerobic zone aeration mechanism, which includes an annular air pipe, a ring rail is fixedly connected to the inner circumference of the top of the circular pool body, a plurality of rollers are rotatably connected to the outer circumference of the annular air pipe in an annular array, and the rollers are rollingly connected to the track grooves of the annular rail, the bottom annular array of the annular air pipe is fixedly connected to the tops of a plurality of vertical pipes, and the bottom of each vertical pipe is fixedly connected to an aeration radial pipe, the aeration radial pipe is located at the bottom of the impact-resistant aerobic zone, aeration heads are equidistantly arranged on both sides of the aeration radial pipe, and the annular air pipe is connected to the air outlet of the air pump through a hose, and the annular air pipe is connected to an annular air pipe forward and reverse reciprocating movable component. The air pump pumps air into the annular air pipe through a hose. The gas in the annular air pipe enters the aeration radial pipe through a vertical pipe, and then is dispersed and discharged through an aeration head to aerate the mixed liquid in the impact-resistant aerobic zone, thereby increasing the oxygen content in the mixed liquid and inhibiting the denitrification reaction of microorganisms in the subsequent sludge sedimentation chamber. The annular air pipe forward and reverse reciprocating component is used to drive the annular air pipe to reciprocate at a certain angle, allowing the aeration radial pipe to reciprocate in the annular impact-resistant aerobic zone, thereby expanding the range of aeration and the uniformity of aeration.

[0017] Compared with the prior art, the beneficial effects of the sewage treatment system with flexible switching between AOA and AOAO are: 1. The rotating power assembly drives the drum to rotate relative to the bracket and the anaerobic tank. The drum drives the water spray radial pipes and tangential nozzles to mix the sludge returned to the anaerobic tank with the sewage in the anaerobic tank. The denitrifying bacteria in the sludge use the organic matter in the sewage to denitrify, and some of the organic matter is converted into internal carbon sources, and phosphates are released. The stirring of the sludge and sewage mixture by the water spray radial pipes and tangential nozzles is conducive to the anaerobic microorganisms to adsorb and absorb the organic matter in the sewage. The nozzle pitch control assembly can change the pitch angle of the tangential nozzle. The water spray angle can be continuously changed during the rotation of the tangential nozzle, which is conducive to further improving the stirring effect of the sludge and sewage mixture and promoting the biological reaction process in the anaerobic tank.

[0018] 2. If the sludge settling performance deteriorates due to the formation of nitrogen by the denitrification reaction in the shock-resistant secondary sedimentation tank mechanism, the mixed liquid shall be subjected to secondary aeration treatment when the mixed liquid is added to the shock-resistant secondary sedimentation tank mechanism to inhibit the denitrification reaction of microorganisms in the sludge sedimentation chamber in the shock-resistant secondary sedimentation tank mechanism, reduce the production of nitrogen, and avoid mud overturning in the secondary sedimentation tank. If there is no mud overturning in the shock-resistant secondary sedimentation tank mechanism during the operation of the sewage treatment system, no secondary aeration treatment shall be performed, or the sewage treatment time required for aeration shall be reduced, thereby saving energy consumption.

[0019] 3. The mud-water mixture in the anoxic tank is sent to the annular cavity through the pump assembly. The mud-water mixture in the annular cavity enters the sludge sedimentation chamber through multiple peripheral water inlets. The peripheral water inlets serve as water distribution structures, allowing the mud-water mixture to enter the bottom of the sludge sedimentation chamber more evenly and quickly diffuse before entering the sludge sedimentation chamber. It enters the clarification area on the upper layer from the bottom of the sludge sedimentation chamber at the lowest speed. Since the water inlet speed is very small, the short-circuit phenomenon usually associated with high-speed water inlet can be avoided, thereby improving the effective utilization coefficient of the tank volume. Since the mud-water mixture presents a plane and slowly rises in the sludge sedimentation chamber, the activated sludge in the suspended layer flocculates and condenses, so that the activated sludge particles in the mixed liquid continuously collide, adsorb, flocculate, and combine with the activated sludge in the suspended layer, resulting in a good suspension clarification effect and improving the sludge sedimentation efficiency of the sedimentation tank.

[0020] 4. The air pump pumps air into the annular air pipe through a hose. The gas in the annular air pipe enters the aeration radial pipe through a vertical pipe, and then is dispersed and discharged through an aeration head to aerate the mixed liquid in the impact-resistant aerobic zone, thereby increasing the oxygen content in the mixed liquid and inhibiting the denitrification reaction of the sewage in the subsequent sludge sedimentation chamber. The annular air pipe forward and reverse reciprocating component is used to drive the annular air pipe to reciprocate at a certain angle, allowing the aeration radial pipe to reciprocate in the annular impact-resistant aerobic zone, thereby expanding the range of aeration and the uniformity of aeration.

[0021] 5. It can flexibly switch between the AOA and AOAO sewage treatment modes according to the sludge settling conditions in the secondary sedimentation tank, which can avoid the mud turning over in the secondary sedimentation tank, and at the same time help reduce the energy consumption of sewage treatment and improve the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the sewage treatment system in which AOA and AOAO can be flexibly switched; Figure 2 For the present invention Figure 1 A schematic diagram of the partially enlarged structure at center A; Figure 3 It is a structural schematic diagram of the anaerobic tank reaction promotion mechanism in the sewage treatment system in which AOA and AOAO can be flexibly switched according to the present invention; Figure 4 It is a schematic diagram of the rear structure of the sewage treatment system in which AOA and AOAO can be flexibly switched according to the present invention; Figure 5 It is a schematic diagram of the partial structure of the sewage treatment system in which AOA and AOAO can be flexibly switched according to the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at B in the middle; Figure 7It is a structural schematic diagram of a floating mud collection and cleaning mechanism in a sewage treatment system in which AOA and AOAO can be flexibly switched according to the present invention; Figure 8 For the present invention Figure 5 A schematic diagram of a top view structure; Fig. 9 For the present invention Figure 8 Schematic diagram of the cross section at D in the middle; Fig.10 For the present invention Fig. 9 A schematic diagram of the partially enlarged structure at C in the middle; In the figure: 1 AOA sewage treatment tank group, 11 anaerobic tank, 12 aerobic tank, 13 anoxic tank, 14 aeration device, 15 sewage stirring device, 16 water supply pipeline, 17 water pump, 2 anaerobic tank reaction promotion mechanism, 21 bracket, 22 drum, 23 mounting sleeve, 24 water spray radial pipe, 25 tangential nozzle, 26 driven gear, 27 driving gear, 28 stirring motor, 29 rotary joint, 210 arch pipe, 211 circulating liquid pump, 212 filling pipe 、213 Solenoid valve 1、214 Circulation pumping pipe、215 Solenoid valve 2、216 Follower frame、217 Electric telescopic rod、218 Synchronous ring、219 Push-pull rod、220 Protruding rod、3 Impact-resistant second sedimentation tank mechanism、31 Round tank body、32 Mud collecting trough、33 Inner tank body、34 Peripheral water inlet、35 Outlet channel、36 Clean water pipe、37 Annular partition、38 Downpipe、39 Downpipe control solenoid valve、310 Sludge sedimentation chamber、311 Filling area , 312 impact-resistant aerobic zone, 313 frustum-shaped pool bottom, 4 slow-flow overflow mechanism, 41 outlet weir, 42 overflow gear, 43 annular fender, 44 annular filter, 5 pool bottom mud scraper mechanism, 51 gallery bridge, 52 mud scraper motor, 53 mud scraper shaft, 54 side rod, 55 scraper, 6 floating mud collection and cleaning mechanism, 61 fixed sleeve, 62 spoke rod, 63 disassembly block, 64 collection bucket, 7 aerobic zone aeration mechanism, 71 annular rail, 72 roller, 7 3 annular air pipe, 74 vertical pipe, 75 aeration radial pipe, 76 aeration head, 77 hose, 78 air pump, 79 motor seat, 710 control motor, 711 support plate, 712 arc track, 713 fan-shaped slider, 714 connecting rod, 715 rotary rod, 8 sludge return mechanism, 81 mud outlet pipe, 82 sludge pump, 83 sludge return pipe one, 84 solenoid valve three, 85 sludge return pipe two, 86 solenoid valve four, 87 mud discharge pipe, 88 solenoid valve five. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] For example, see Figures 1 to 10 The present embodiment provides a technical solution: a sewage treatment system with flexible switch between AOA and AOAO, including an AOA sewage treatment tank group 1, the AOA sewage treatment tank group 1 includes an anaerobic tank 11, an aerobic tank 12 and an anoxic tank 13, an aerobic tank 12 is provided with an aeration device 14, the aeration device 14 adopts a conventional aeration pipe, the anoxic tank 13 is provided with a sewage stirring device 15, the sewage stirring device 15 adopts a conventional stirring component, the anaerobic tank 11, the aerobic tank 12 and the anoxic tank 13 are connected in series in sequence through a pump water assembly.

[0025] An anaerobic tank reaction promotion mechanism 2, an impact-resistant secondary sedimentation tank mechanism 3 and a sludge return mechanism 8 are also provided.

[0026] The anaerobic tank reaction promotion mechanism 2 includes a bracket 21, a rotating drum 22, a mounting sleeve 23, a water spray radial pipe 24, a tangential nozzle 25, a rotating power assembly and a nozzle pitch control assembly. A plurality of brackets 21 are equidistantly arranged on the top of the anaerobic tank 11. The number of brackets 21 can be selected appropriately according to the length of the anaerobic tank 11. In this embodiment, three brackets are used. In order to reduce the dead angle of stirring, the inner sides of both ends of the anaerobic tank 11 can be set to be arc-shaped. The middle of each bracket 21 is rotatably connected to the vertical rotating drum 22 through a bearing, and the top of each rotating drum 22 is respectively connected to the rotating power assembly. The bottom of the rotating drum 22 extends into the anaerobic tank 11, and three mounting sleeves 23 are respectively arranged in a circular array on the outer peripheral side of the bottom of each rotating drum 22. Each mounting sleeve 23 is rotatably connected to one end of the water spray radial pipe 24, and the other end of the water spray radial pipe 24 is provided with a tangential nozzle 25, and the side of the water spray radial pipe 24 is connected to the nozzle pitch control assembly.

[0027] The rotating power assembly includes a driven gear 26, a driving gear 27, and a stirring motor 28. A driven gear 26 is fixedly sleeved on the top of each rotating drum 22, and a stirring motor 28 is installed on the bracket 21. The output shaft of the stirring motor 28 is fixedly connected with the driving gear 27. The driving gear 27 is meshed with the driven gear 26. When the stirring motor 28 works, the rotating drum 22 can be driven to rotate through the transmission of the driven gear 26 and the driving gear 27, thereby providing power for the rotation of the rotating drum 22.

[0028] The nozzle pitch control assembly includes a follower frame 216, an electric telescopic rod 217, a synchronous ring 218, a push-pull rod 219 and a protruding rod 220. The rotating drum 22 is located at the lower side of the bracket 21 and is fixedly sleeved with the follower frame 216. The bottoms of both ends of the follower frame 216 are respectively fixedly connected to the tops of the two electric telescopic rods 217. The bottoms of the two electric telescopic rods 217 are respectively fixedly connected to the two sides of the synchronous ring 218. The bottom of the synchronous ring 218 is movably connected to the tops of the three push-pull rods 219 through a pin shaft. The side surfaces of each water spray radial pipe 24 are respectively provided with protruding rods 220. The bottom ends of the three push-pull rods 219 are respectively movably connected to the corresponding ends of the protruding rods 220 through pin shafts.

[0029] The follower frame 216 rotates with the drum 22, and the electric telescopic rod 217 is extended to push the convex rod 220 downward through the push-pull rod 219. The convex rod 220 drives the water spray radial pipe 24 to rotate relative to the drum 22 through the mounting sleeve 23, so that the tangential nozzle 25 at the end of the water spray radial pipe 24 can be gradually lifted upward. The electric telescopic rod 217 is shortened, and the push-pull rod 219 and the convex rod 220 can be used to make the water spray radial pipe 24 rotate in the opposite direction, so that the tangential nozzle 25 at the end of the water spray radial pipe 24 can be gradually moved downward, thereby changing the pitch angle of the tangential nozzle 25, so that the tangential nozzle 25 can spray water into the anaerobic tank 11 at different pitch angles, and promote the water spraying method. The flow of sewage in the anaerobic tank 11 promotes the full mixing of sewage sludge in the anaerobic tank 11, and the change of the pitch angle of the tangential nozzle 25 cooperates with the rotation of the drum 22 and the water spraying radial pipe 24 to promote the stirring and mixing of sewage sludge. Since it is necessary to power the electric telescopic rod 217 to control the extension and retraction of the electric telescopic rod 217, if the electric telescopic rod 217 is directly connected by a cable, the cable will be torn off as the drum 22 rotates. Therefore, a conductive slip ring can be set on the top of the drum 22, which is dedicated to transmitting power supply and signal power supply during unlimited continuous rotation. With the help of the conductive slip ring, the electric telescopic rod 217 can be powered and controlled while rotating.

[0030] The anaerobic tank reaction promotion mechanism 2 also includes a rotary joint 29, an arched pipe 210, a circulating liquid pump 211, a filling pipe 212, an electromagnetic valve 1 213, a circulating extraction pipe 214 and an electromagnetic valve 2 215. The top of each rotating drum 22 is connected to one end of the arched pipe 210 through the rotary joint 29, and the other end of each arched pipe 210 is connected to the outlet of the circulating liquid pump 211. The inlet of each circulating liquid pump 211 is connected to one end of the filling pipe 212. The filling pipe 212 is equipped with an electromagnetic valve 1 213. The inlet of each circulating liquid pump 211 is also connected to one end of the circulating extraction pipe 214. The other end of the circulating extraction pipe 214 is connected to the anaerobic tank 11, and the circulating extraction pipe 214 is equipped with an electromagnetic valve 215. The filling pipe 212 is connected to the external sewage source, the electromagnetic valve 215 is closed, the electromagnetic valve 1 213 is opened, and the circulating liquid pump 211 works to send the external sewage source into the drum 22 through the filling pipe 212, the arch pipe 210 and the rotary joint 29, and then into the anaerobic tank 11 through the water spraying radial pipe 24 and the tangential nozzle 25. When the amount of sewage in the anaerobic tank 11 is sufficient, the electromagnetic valve 215 is opened, the electromagnetic valve 1 213 is closed, and the circulating liquid pump 211 continues to work, so that the circulation and mixing of the sewage in the anaerobic tank 11 can be completed. The water is pumped out and then sent back into the anaerobic tank 11 through the water spraying radial pipe 24 and the tangential nozzle 25. With the rotation of the water spraying radial pipe 24 and the tangential nozzle 25 and the pitching movement of the tangential nozzle 25, the sewage in the anaerobic tank 11 and the returned sludge are fully mixed, which promotes the denitrifying bacteria in the sludge to convert the organic matter in the sewage into an internal carbon source and accelerates the release of phosphate. If needed, a capping component can be added to the top of the anaerobic tank 11 to seal the top of the anaerobic tank 11, and gases such as methane generated during the reaction can be collected at the top of the anaerobic tank 11.

[0031] The bottom of the impact-resistant secondary sedimentation tank mechanism 3 is connected to the anaerobic tank 11 and the anoxic tank 13 through a sludge return mechanism 8, and the anoxic tank 13 is connected to the impact-resistant secondary sedimentation tank mechanism 3 through a pumping assembly.

[0032] The impact-resistant secondary sedimentation tank mechanism 3 includes a circular tank body 31, a mud collecting trough 32, a frustum-shaped tank bottom 313, and a secondary sedimentation tank peripheral water inlet and outlet assembly. The bottom of the circular tank body 31 is provided with a frustum-shaped tank bottom 313, and the bottom center of the frustum-shaped tank bottom 313 is provided with a mud collecting trough 32. The secondary sedimentation tank peripheral water inlet and outlet assembly is installed inside the circular tank body 31. The circular tank body 31, the mud collecting trough 32, and the frustum-shaped tank bottom 313 constitute a basic secondary sedimentation tank structure. The secondary sedimentation tank peripheral water inlet and outlet assembly can allow sewage to enter from the peripheral bottom of the secondary sedimentation tank structure, and then allow the upper layer of clean water to be discharged from the peripheral top of the secondary sedimentation tank structure, which is conducive to increasing the water inlet section, making the water distribution more uniform, and is conducive to improving the volume utilization rate of the sedimentation tank, and can also increase its surface load.

[0033] The peripheral inlet and outlet water components of the secondary sedimentation tank include an inner tank body 33, a peripheral water inlet 34, an outlet channel 35, a clean water pipe 36 and a sludge sedimentation chamber 310. A circular inner tank body 33 is arranged on the inner side of the circular tank body 31. The inner area of ​​the inner tank body 33 is the sludge sedimentation chamber 310. There is an annular cavity between the circular tank body 31 and the inner tank body 33, and a peripheral water inlet 34 is arranged in an annular array at the bottom of the inner tank body 33. An annular outlet channel 35 is arranged on the inner side of the inner tank body 33. The tops of the circular tank body 31 and the inner tank body 33 are flush, and the top horizontal position of the outlet channel 35 is lower than the top of the inner tank body 33. The outlet channel 35 is connected to one end of the clean water pipe 36, and the other end of the clean water pipe 36 extends to the outside of the circular tank body 31.

[0034] The water pump assembly includes a water supply pipe 16 and a water pump 17. The water pump 17 serves as a power source for pumping water. The mud-water mixture in the anaerobic tank 11 can be sent to the aerobic tank 12 by means of the water supply pipe 16 and the water pump 17. The mud-water mixture in the aerobic tank 12 can be sent to the anoxic tank 13 by means of the water supply pipe 16 and the water pump 17. The mud-water mixture in the anoxic tank 13 can be sent to the top of the annular cavity by means of the water supply pipe 16 and the water pump 17.

[0035] The muddy-water mixture in the anoxic tank 13 is sent to the annular cavity through the pump assembly. The muddy-water mixture in the annular cavity enters the sludge settling chamber 310 through multiple peripheral water inlets 34. The peripheral water inlets 34 serve as a water distribution structure, allowing the muddy-water mixture to enter the bottom of the sludge settling chamber 310 more evenly and quickly diffuse before entering the sludge settling chamber 310. It enters the upper clarifying area from the bottom of the sludge settling chamber 310 at the lowest speed. Since the water inlet speed is very low, the short circuit phenomenon usually associated with high-speed water inlet can be avoided. , which improves the effective utilization coefficient of the pool volume. Since the mud-water mixture presents a slowly rising flow state in a plane in the sludge sedimentation chamber 310, the activated sludge in the suspended layer flocculates and condenses, so that the activated sludge particles in the sewage mixture continuously collide, adsorb, flocculate, and combine with the activated sludge in the suspended layer, producing a good suspension clarification effect, thereby improving the sludge sedimentation efficiency of the sedimentation tank. The clean water in the upper layer of the sludge sedimentation chamber 310 passes over the top inner edge of the outlet channel 35 and enters the outlet channel 35, and then is discharged through the clean water pipe 36.

[0036] The impact-resistant secondary sedimentation tank mechanism 3 also includes an annular partition 37, a downcomer 38, a downcomer control solenoid valve 39, a filling area 311 and an impact-resistant aerobic area 312. An annular partition 37 is arranged between the outer side of the circular pool body 31 and the outer side of the inner pool body 33. The annular partition 37 divides the annular cavity into an upper impact-resistant aerobic area 312 and a filling area 311 on the lower side. A vertical downcomer 38 is arranged in an annular array on the annular partition 37, and a downcomer control solenoid valve 39 is installed in the middle of the downcomer 38. When the muddy and water mixture in the anoxic tank 13 is sent into the sludge settling chamber 310, in order to quickly empty the anoxic tank 13 for the treatment of the next pool of sewage, the muddy and water mixture will quickly enter the sludge settling chamber 310 through the annular cavity and the peripheral water inlet 34. At this time, the load in the sludge settling chamber 310 exceeds the standard and will be subjected to a large impact. The sludge in the sludge settling chamber 310 has no time to settle. Therefore, the annular cavity is divided into an impact-resistant aerobic zone 312 and a filling zone 311 through an annular partition 37. The sewage sludge mixture first enters the impact-resistant aerobic zone 312 for temporary storage, and then is gradually allowed to pass through the filling zone through the control of the downpipe 38 and the downpipe control solenoid valve 39. 311 and the surrounding water inlet 34 enter the sludge sedimentation chamber 310, slowing down the speed of adding in the sludge sedimentation chamber 310. The shock-resistant aerobic zone 312 plays a buffering role for a large amount of sewage. If mud turning occurs in the sludge sedimentation chamber 310, the mixed liquid in the shock-resistant aerobic zone 312 is aerated to inhibit the denitrification reaction of the sewage in the sludge sedimentation chamber 310 and improve the sludge sedimentation performance. The shock-resistant aerobic zone 312 plays a role in temporarily storing the mud-water mixed liquid. At the same time, it also serves as a post-aerobic zone, which can aerate the mixed liquid entering the sludge sedimentation chamber 310 as needed, thereby realizing flexible switching of the AOA and AOAO treatment processes.

[0037] The impact-resistant aerobic zone 312 is integrated with the sedimentation tank, and there is no need to occupy additional space to build a separate post-aerobic zone. The aerobic treatment operation can be quickly realized when needed. When not needed, the impact-resistant aerobic zone 312 is used only as a temporary storage area for the mixture, which slows down the speed of feeding the mixed liquid into the sludge sedimentation chamber 310 and improves the impact resistance of the sedimentation tank.

[0038] In order to allow the aeration process to be carried out in the impact-resistant aerobic zone 312, an aerobic zone aeration mechanism 7 is also provided. The aerobic zone aeration mechanism 7 includes an annular rail 71, rollers 72, annular air pipes 73, vertical pipes 74, aeration radial pipes 75, aeration heads 76, hoses 77, air pumps 78 and annular air pipe forward and reverse reciprocating components. The inner circumference of the top of the circular pool body 31 is fixedly connected to the annular rail 71, and the outer circumference of the annular air pipe 73 is rotatably connected to a plurality of rollers 72 in an annular array. In order to maintain the stability of the annular air pipe 73 when rotating, the number of rollers 72 is not less than six, and the rollers 72 and the track of the annular rail 71 are fixedly connected. The groove is rollingly connected, and the bottom annular array of the annular air pipe 73 is fixedly connected to the top of multiple vertical pipes 74. The number of vertical pipes 74 is not less than twelve, and the bottom of each vertical pipe 74 is fixedly connected with an aeration radial pipe 75. The aeration radial pipe 75 is distributed along the radial direction of the annular rail 71. The aeration radial pipe 75 is located at the bottom of the impact-resistant aerobic zone 312. Aeration heads 76 are equidistantly arranged on both sides of the aeration radial pipe 75, and the annular air pipe 73 is connected to the air outlet of the air pump 78 through a hose 77. The air pump 78 is installed on the outside of the circular pool body 31, and the annular air pipe 73 is connected to an annular air pipe forward and reverse reciprocating movable component.

[0039] The annular air pipe forward and reverse reciprocating component includes a motor seat 79, a control motor 710, a support plate 711, an arc track 712, a fan-shaped slider 713, a connecting rod 714, and a rotating rod 715. The top of the circular pool body 31 is fixedly connected with the arc track 712, and the center of the circle where the arc track 712 is located coincides with the center of the circle of the circular pool body 31. The fan-shaped slider 713 is slidably connected in the arc track 712, and the bottom of the fan-shaped slider 713 is fixedly connected to the top of the annular air pipe 73. The top of the fan-shaped slider 713 is movably connected to one end of the connecting rod 714 through a movable shaft 1, and the other end of the connecting rod 714 is movably connected to one end of the rotating rod 715 through a movable shaft 2. The other end of the rotary rod 715 is fixedly connected to the output shaft at the top of the control motor 710, and the end of the arc track 712 is fixedly connected to a support plate 711, and the support plate 711 is rotatably connected to the output shaft at the top of the control motor 710. The bottom of the control motor 710 is installed on the top outer peripheral side of the circular pool body 31 through the motor seat 79. The control motor 710 drives the rotary rod 715 to rotate when it works. The rotary rod 715 can drive the fan-shaped slider 713 to reciprocate in the arc track 712 through the connecting rod 714. Since the center of the circle where the arc track 712 is located coincides with the center of the circular pool body 31, the annular air pipe 73 can be driven to rotate back and forth at a certain angle.

[0040] The air pump 78 pumps air into the annular air pipe 73 through the hose 77. The gas in the annular air pipe 73 enters the aeration radial pipe 75 through the vertical pipe 74, and then is dispersed and discharged through the aeration head 76 to aerate the mixed liquid in the impact-resistant aerobic zone 312, thereby increasing the oxygen content in the mixed liquid and inhibiting the denitrification reaction of the sludge in the subsequent sludge sedimentation chamber. The annular air pipe forward and reverse reciprocating component is used to drive the annular air pipe 73 to rotate forward and reverse at a certain angle, allowing the aeration radial pipe 75 to reciprocate in the annular impact-resistant aerobic zone 312, thereby expanding the aeration range and the aeration uniformity.

[0041] The sludge return mechanism 8 includes a sludge discharge pipe 81, a sludge pump 82, a sludge return pipe 1 83, a solenoid valve 3 84, a sludge return pipe 2 85, a solenoid valve 4 86, a sludge discharge pipe 87, and a solenoid valve 5 88. The side of the sludge collecting tank 32 is connected to one end of the sludge discharge pipe 81, the other end of the sludge discharge pipe 81 is connected to the inlet of the sludge pump 82, the outlet of the sludge pump 82 is respectively connected to the sludge discharge pipe 87 and one end of the sludge return pipe 1 83, the solenoid valve 5 88 is installed on the sludge discharge pipe 87, the other end of the sludge return pipe 1 83 is connected to the anaerobic tank 11, the solenoid valve 3 84 is installed at one end of the sludge return pipe 1 83 close to the anaerobic tank 11, and the middle part of the sludge return pipe 1 83 is connected to the sludge return pipe 2 8 5, and the other end of the sludge return pipe 2 85 is connected to the anoxic tank 13. The solenoid valve 4 86 is installed on the sludge return pipe 2 85. The sludge pump 82 can discharge the sludge in the sludge collecting tank 32 with the help of the mud outlet pipe 81. The solenoid valve 3 84 and the sludge return pipe 2 85 are closed, and the solenoid valve 5 88 is opened. The sludge can be discharged for subsequent operations such as filter pressing. The sludge return pipe 2 85 and the solenoid valve 5 88 are closed, and the solenoid valve 3 84 is opened. The sludge can be returned to the anaerobic tank 11 through the sludge return pipe 1 83. The solenoid valve 3 84 and the solenoid valve 5 88 are closed, and the sludge return pipe 2 85 is opened. The sludge can be returned to the anoxic tank 13 through the sludge return pipe 2 85.

[0042] When in use, sewage enters the water spraying radial pipe 24 through the drum 22 and the mounting sleeve 23, and then is sprayed into the anaerobic tank 11 through the tangential nozzle 25. The sludge return mechanism 8 returns the sludge precipitated in the impact-resistant secondary sedimentation tank mechanism 3 to the anaerobic tank 11. The rotary power assembly drives the drum 22 to rotate relative to the bracket 21 and the anaerobic tank 11. The drum 22 drives the water spraying radial pipe 24 and the tangential nozzle 25 to mix the sludge returned to the anaerobic tank 11 with the sewage in the anaerobic tank 11. The denitrifying bacteria in the sludge use the organic matter in the sewage to denitrify, and some of the organic matter is The sludge and sewage mixture is converted into an internal carbon source, and the phosphate is released. The water spraying radial pipe 24 and the tangential nozzle 25 stir the sludge and sewage mixture, which is beneficial for anaerobic microorganisms to adsorb and absorb organic matter in the sewage. The nozzle pitch control component can change the pitch angle of the tangential nozzle 25. During the rotation of the tangential nozzle 25, the water spraying angle can be continuously changed, which is beneficial to further enhance the stirring effect of the sludge and sewage mixture. Then, the sludge-water mixture in the anaerobic tank 11 is sent to the aerobic tank 12 through the pump assembly. The aeration device 14 in the aerobic tank 12 stirs the sludge-water mixture. Combined liquid aeration, aerobic phosphorus absorption reaction, nitrification reaction and synchronous nitrification and denitrification reaction occur in the aerobic tank 12, nitrate is generated and phosphorus is absorbed at the same time, then the muddy water mixture in the aerobic tank 12 is sent to the anoxic tank 13 through the pumping assembly, the sludge return mechanism 8 returns the sludge precipitated in the impact-resistant secondary sedimentation tank mechanism 3 to the anoxic tank 13, completing the return of nitrate to the anoxic tank 13, denitrification and denitrification in the anoxic tank 13, then the muddy water mixture in the anoxic tank 13 is sent to the impact-resistant secondary sedimentation tank mechanism 3 through the pumping assembly, so that the sludge in the muddy water mixture is precipitated, If the sludge settling performance deteriorates due to the formation of nitrogen by the denitrification reaction in the shock-resistant secondary sedimentation tank mechanism 3, the sewage is subjected to secondary aeration treatment when the sewage is added to the shock-resistant secondary sedimentation tank mechanism 3 to inhibit the denitrification reaction of the mud-water mixture in the sludge sedimentation chamber in the shock-resistant secondary sedimentation tank mechanism 3, reduce the generation of nitrogen, and avoid mud overturning in the secondary sedimentation tank. If there is no mud overturning in the shock-resistant secondary sedimentation tank mechanism 3 during the operation of the sewage treatment system, secondary aeration treatment is no longer performed, or the sewage treatment time required for aeration is reduced, thereby saving energy consumption.

[0043] For example 2, please refer to Figures 1 to 10 This embodiment provides a technical solution: a sewage treatment system in which AOA and AOAO can be flexibly switched. The structure of this embodiment is roughly the same as that of the first embodiment, except that: In order to slow down the speed of clean water discharge and filter the floating mud that may be discharged, a slow-flow overflow mechanism 4 is also provided. The slow-flow overflow mechanism 4 includes a water outlet weir 41, overflow retaining teeth 42, an annular fender 43 and an annular filter screen 44. The inner peripheral side of the outlet channel 35 is provided with a water outlet weir 41, and the inner and outer edges of the top of the water outlet weir 41 are respectively provided with overflow retaining teeth 42 in an annular array. The inner peripheral side of the water outlet weir 41 is provided with an annular fender 43, and the cross-section of the annular fender 43 is an arc structure. The upper outer edge of the annular fender 43 is detachably installed with an annular filter screen 44, and the outer side of the annular filter screen 44 is close to the inner peripheral side of the water outlet weir 41, and the top horizontal position of the annular filter screen 44 is higher than the top of the overflow retaining teeth 42. The annular fender 43 guides the rising water flow, and the clean water in the upper layer of the sludge sedimentation chamber 310 passes over the upper edge of the annular fender 43, is filtered by the annular filter screen 44, then passes over the overflow tooth 42 and enters the outlet weir 41, and finally enters the outlet channel 35, wherein the annular filter screen 44 can filter the scum that occasionally appears, and the overflow tooth 42 is used for the uniform outflow of water, and the rising flow of some water is too fast to cause the sludge to float.

[0044] Due to the provision of the outlet weir 41, the overflow retaining teeth 42, the annular mud guard plate 43 and the annular filter screen 44, the sewage treatment system can easily handle the mud turning phenomenon in a short period of time, and put the aerobic zone aeration mechanism 7 into operation after the mud turning phenomenon occurs, with good working flexibility and high redundancy, avoiding excessive sludge impurities in subsequent clean water and reducing the pressure of subsequent sewage treatment equipment.

[0045] For example 3, please refer to Figures 1 to 10 This embodiment provides a technical solution: a sewage treatment system in which AOA and AOAO can be flexibly switched. The structure of this embodiment is roughly the same as that of the second embodiment, except that: In order to process the sludge at the top and bottom of the secondary sedimentation tank, a bottom scraper mechanism 5 and a floating mud collection and cleaning mechanism 6 are respectively provided, wherein the bottom scraper mechanism 5 includes a gallery bridge 51, a scraper motor 52, a scraper shaft 53, a side rod 54 and a scraper 55. A gallery bridge 51 is provided on the top of the circular pool body 31. The middle part of the gallery bridge 51 is rotatably connected to a vertical scraper shaft 53 through a bearing. The top of the scraper shaft 53 is fixedly connected to the output shaft of the scraper motor 52. The scraper motor 52 is installed on the gallery bridge 51. The bottom of the scraper shaft 53 is connected to two scrapers 55 through two side rods 54. The two scrapers 55 respectively cooperate with the upper side of the frustum-shaped pool bottom 313. The gallery bridge 51 is used to install the scraper motor 52 and the scraper shaft 53. The gallery bridge 51 is also convenient for the staff to walk to the top of the circular pool body 31 to observe the operation status inside the circular pool body 31, and it is also convenient to maintain the circular pool body 31. The scraper motor 52 drives the scraper shaft 53 to rotate, and the scraper shaft 53 drives the scraper 55 to rotate through the side rod 54. The scraper 55 is used to scrape off the sludge attached to the upper side of the frustum-shaped pool bottom 313, so that the sludge falls into the sludge collecting tank 32, which is convenient for being discharged by the sludge pump, avoiding the sludge from staying at the bottom of the pool for too long and anaerobic decomposition, and avoiding the sludge from floating up in the form of blocks due to the reduction of its density due to the anaerobic gas produced.

[0046] It also includes a floating mud collecting and cleaning mechanism 6, which includes a fixed sleeve 61, a spoke rod 62, a disassembly block 63, and a collecting bucket 64. One end of the spoke rod 62 is fixedly connected to the mud scraping shaft 53 through the fixed sleeve 61, and the collecting bucket 64 is evenly provided with leakage holes. The collecting bucket 64 is located on the upper side of the annular mud guard 43, and a disassembly block 63 is installed on the side of the collecting bucket 64. The disassembly block 63 is detachably connected to the other end of the spoke rod 62. If suspended sludge appears, the suspended sludge will be filtered out by the annular filter screen 44. The accumulation of suspended sludge will affect the discharge efficiency of clean water. Therefore, during the scraping process, the scraping shaft 53 drives the collecting bucket 64 to rotate on the upper side of the annular mud guard 43 through the fixed sleeve 61 and the spoke rod 62. The collecting bucket 64 can collect the floating sludge filtered out by the annular filter screen 44. A sinking port can be set on the corridor bridge 51. When the collecting bucket 64 rotates to the bottom of the sinking port, the staff can take out the floating sludge in the collecting bucket 64 through the sinking port. The disassembly block 63 is set to facilitate the removal of the collecting bucket 64 from the end of the spoke rod 62.

[0047] It is worth noting that the aeration device 14, sewage stirring device 15, stirring motor 28, electric telescopic rod 217, solenoid valve 1 213, solenoid valve 2 215, circulating liquid pump 211, water pump 17, drainage control solenoid valve 39, air pump 78, control motor 710, sludge pump 82, solenoid valve 3 84, solenoid valve 4 86, solenoid valve 5 88, and mud scraping motor 52 disclosed in the above embodiments are all controlled by an external PLC controller, and the control method thereof adopts the method commonly used in the prior art, wherein the mud scraping motor 52 adopts a servo motor.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sewage treatment system capable of flexibly switching between AOA and AOAO, comprising an AOA sewage treatment tank group (1), wherein the AOA sewage treatment tank group (1) comprises an anaerobic tank (11), an aerobic tank (12) and an anoxic tank (13), wherein the anaerobic tank (11), the aerobic tank (12) and the anoxic tank (13) are sequentially connected in series via a pump assembly, characterized in that: Also includes: An anaerobic tank reaction promotion mechanism (2) comprises a rotating drum (22), a water spraying radial pipe (24), a tangential nozzle (25) and a nozzle pitch control assembly. A plurality of brackets (21) are arranged at equal distances on the top of the anaerobic tank (11). The middle of each bracket (21) is rotatably connected to a vertical rotating drum (22). The top of each rotating drum (22) is connected to a rotating power assembly. The bottom of the rotating drum (22) extends into the anaerobic tank (11). Three mounting sleeves (23) are arranged in a circular array on the outer peripheral side of the bottom of each rotating drum (22). Each mounting sleeve (23) is rotatably connected to one end of the water spraying radial pipe (24). The other end of the water spraying radial pipe (24) is provided with a tangential nozzle (25). The side of the water spraying radial pipe (24) is connected to the nozzle pitch control assembly. The bottom of the impact-resistant secondary sedimentation tank mechanism (3) is connected to the anaerobic tank (11) and the anoxic tank (13) via a sludge return mechanism (8), and the anoxic tank (13) is connected to the impact-resistant secondary sedimentation tank mechanism (3) via a water pump assembly.

2. The sewage treatment system with flexible switch between AOA and AOAO according to claim 1, characterized in that: The nozzle pitch control assembly comprises a follower frame (216), an electric telescopic rod (217), a synchronous ring (218), a push-pull rod (219) and a protruding rod (220); the rotating drum (22) is located at the lower side of the bracket (21) and is fixedly sleeved with the follower frame (216); the bottoms of both ends of the follower frame (216) are respectively fixedly connected to the top ends of two electric telescopic rods (217); the bottom ends of the two electric telescopic rods (217) are respectively fixedly connected to the two sides of the synchronous ring (218); the bottom of the synchronous ring (218) is movably connected to the top ends of three push-pull rods (219); the side surfaces of each water spray radial pipe (24) are respectively provided with protruding rods (220); the bottom ends of the three push-pull rods (219) are respectively movably connected to the ends of the corresponding protruding rods (220).

3. The sewage treatment system with flexible switch between AOA and AOAO according to claim 1, characterized in that: The anaerobic tank reaction promotion mechanism (2) further comprises a circulating liquid pump (211); the top end of each rotating drum (22) is connected to one end of an arched tube (210) via a rotating joint (29); the other end of each arched tube (210) is connected to the outlet of the circulating liquid pump (211); the inlet of each circulating liquid pump (211) is connected to one end of a filling pipe (212); a solenoid valve 1 (213) is installed on the filling pipe (212); the inlet of each circulating liquid pump (211) is also connected to one end of a circulating pumping pipe (214); the other end of the circulating pumping pipe (214) is connected to the anaerobic tank (11); and a solenoid valve 2 (215) is installed on the circulating pumping pipe (214).

4. The sewage treatment system with flexible switch between AOA and AOAO according to claim 1, characterized in that: The impact-resistant secondary sedimentation tank mechanism (3) comprises a circular tank body (31), a mud collecting trough (32), a frustum-shaped tank bottom (313) and a secondary sedimentation tank peripheral water inlet and outlet assembly, wherein the bottom of the circular tank body (31) is provided with a frustum-shaped tank bottom (313), the bottom center of the frustum-shaped tank bottom (313) is provided with a mud collecting trough (32), and the interior of the circular tank body (31) is provided with a secondary sedimentation tank peripheral water inlet and outlet assembly.

5. The sewage treatment system with flexible switch between AOA and AOAO according to claim 4 is characterized by: The peripheral water inlet and outlet assembly of the secondary sedimentation tank comprises an inner tank body (33), a circular inner tank body (33) is arranged on the inner side of the circular tank body (31), the inner area of ​​the inner tank body (33) is a sludge sedimentation chamber (310), an annular chamber is formed between the circular tank body (31) and the inner tank body (33), and a peripheral water inlet (34) is arranged in an annular array at the bottom of the inner tank body (33), an annular water outlet channel (35) is arranged on the inner side of the inner tank body (33), the water outlet channel (35) is connected to one end of a clean water pipe (36), and the other end of the clean water pipe (36) extends to the outer side of the circular tank body (31).

6. The sewage treatment system with flexible switch between AOA and AOAO according to claim 5, characterized in that: The impact-resistant secondary sedimentation tank mechanism (3) further comprises an annular baffle (37), a downpipe (38) and a downpipe control solenoid valve (39). An annular baffle (37) is arranged between the outer side of the circular tank body (31) and the outer side of the inner tank body (33). The annular baffle (37) divides the annular cavity into an upper impact-resistant aerobic zone (312) and a lower filling zone (311). A vertical downpipe (38) is arranged in an annular array on the annular baffle (37). A downpipe control solenoid valve (39) is installed in the middle of the downpipe (38).

7. The sewage treatment system with flexible switch between AOA and AOAO according to claim 5, characterized in that: The invention also comprises a slow-flow overflow mechanism (4), the slow-flow overflow mechanism (4) comprising a water outlet weir (41), overflow retaining teeth (42), an annular fender (43) and an annular filter screen (44); the water outlet weir (41) is arranged on the inner peripheral side of the water outlet channel (35); the overflow retaining teeth (42) are arranged in an annular array on the inner and outer edges of the top of the water outlet weir (41); the annular fender (43) is arranged on the inner peripheral side of the water outlet weir (41); and the annular filter screen (44) is detachably mounted on the upper outer edge of the annular fender (43).

8. The sewage treatment system with flexible switch between AOA and AOAO according to claim 7, characterized in that: The invention also comprises a pool bottom scraping mechanism (5), the pool bottom scraping mechanism (5) comprising a gallery bridge (51), a scraping motor (52), a scraping shaft (53), side rods (54) and a scraper (55). The top of the circular pool body (31) is provided with a gallery bridge (51), the middle of the gallery bridge (51) is rotatably connected to a vertical scraping shaft (53), the top of the scraping shaft (53) is fixedly connected to the output shaft of the scraping motor (52), the scraping motor (52) is mounted on the gallery bridge (51), and the bottom of the scraping shaft (53) is connected to two scrapers (55) via two side rods (54).

9. The sewage treatment system with flexible switch between AOA and AOAO according to claim 8, characterized in that: The invention also comprises a floating mud collecting and cleaning mechanism (6), wherein the floating mud collecting and cleaning mechanism (6) comprises a collecting bucket (64), wherein the scraping mud rotating shaft (53) is fixedly connected to one end of a spoke rod (62) via a fixing sleeve (61), wherein the collecting bucket (64) is evenly provided with water leakage holes, and the collecting bucket (64) is located on the upper side of the annular mud guard (43), and a disassembly block (63) is installed on the side of the collecting bucket (64), and the disassembly block (63) is detachably connected to the other end of the spoke rod (62).

10. The sewage treatment system with flexible switch between AOA and AOAO according to claim 6, characterized in that: The aerobic zone aeration mechanism (7) is also included. The aerobic zone aeration mechanism (7) includes an annular air pipe (73). The inner circumference of the top of the circular pool body (31) is fixedly connected to an annular rail (71). The outer circumference of the annular air pipe (73) is rotatably connected to a plurality of rollers (72) in an annular array. The rollers (72) are rollingly connected to the track grooves of the annular rail (71). The bottom annular array of the annular air pipe (73) is fixedly connected to the tops of a plurality of vertical pipes (74). The bottom of each vertical pipe (74) is respectively fixedly connected to an aeration radial pipe (75). Aeration heads (76) are respectively arranged at equal distances on both sides of the aeration radial pipe (75). The annular air pipe (73) is connected to the air outlet of an air pump (78) via a hose (77). The annular air pipe (73) is connected to an annular air pipe forward and reverse reciprocating movable component.

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