A combined urban greywater treatment device

Abstract

This invention relates to the field of urban wastewater treatment technology and discloses a combined treatment device for urban greywater, including a treatment tank. The cleaning components include cleaning scrapers, a rotating shaft, and partition plates. Three partition plates are fixed on the rotating shaft, and cleaning scrapers are arranged between adjacent partition plates. By rotating the partition plates, the treatment chamber is divided into three functional areas: treatment, transition, and settling. The rotation of these zones is automatically triggered by a water level sensor, achieving a continuous and seamless connection between the dosing, reaction, and sedimentation processes. The cleaning scrapers are guided by a specially shaped track groove to perform scraping of attached sediment, oscillation mixing to promote reaction, and static sedimentation in different areas, effectively preventing blockage of aeration pipes and inner walls, improving reagent utilization and phosphorus removal efficiency. The overall structure has a high degree of integration, achieving fully automatic control of automatic sediment scraping, zoned circulation, and sludge discharge, significantly improving the stability and efficiency of phosphorus removal treatment.

Description

Technical Field

[0001] This invention relates to the field of urban wastewater treatment technology, specifically to a combined treatment device for urban greywater. Background Technology

[0002] Phosphorus removal in urban wastewater treatment is a crucial step in preventing eutrophication. Chemical precipitation has become one of the most widely used phosphorus removal technologies due to its high efficiency and relatively simple operation.

[0003] Current technologies for phosphorus removal from urban wastewater typically involve adding phosphorus removal agents (such as aluminum and iron salts) to react with phosphates in the wastewater, forming insoluble precipitates. This is followed by aeration and stirring to promote the reaction, and gravity settling to achieve solid-liquid separation. While this method effectively improves treatment efficiency and stability, in actual operation, the resulting flocculent precipitates easily adhere to the reactor walls, stirring components, and aeration devices. This adhesion not only reduces the effective reaction volume and mass transfer efficiency but also causes blockage of aeration pipes, severely affecting aeration uniformity and reaction efficiency. Frequent shutdowns for cleaning are necessary, limiting continuous operation. Furthermore, traditional continuous flow reactors struggle to strictly separate the different functional stages of mixing, reaction, and sedimentation in space. This leads to frequent short-circuiting of water flow and sludge back-mixing, interfering with the stability of the sedimentation process, resulting in poor settling, fluctuating effluent quality, and even floc carryover, ultimately affecting the final phosphorus removal effect.

[0004] Therefore, it does not meet the existing needs, so we propose a combined urban greywater treatment device. Summary of the Invention

[0005] This invention provides a combined urban greywater treatment device. A rotating partition divides the treatment chamber into three functional zones: treatment, transition, and settling. Automatic zone rotation is triggered by a water level sensor, enabling seamless integration of dosing, reaction, and sedimentation processes. A specially shaped track groove guides a cleaning scraper to perform scraping of adhering sediment, oscillation mixing to promote reaction, and static sedimentation in different zones, effectively preventing blockage of aeration pipes and inner walls, improving reagent utilization and phosphorus removal efficiency. The highly integrated overall structure achieves fully automated control of sediment scraping, zoned circulation, and sludge discharge, significantly improving the stability and efficiency of phosphorus removal treatment and solving the problems mentioned in the background section.

[0006] The present invention provides the following technical solution: a combined treatment device for urban greywater, including a treatment tank, an inlet pipe installed on the treatment tank, a pair of symmetrically arranged receiving cavities inside the treatment tank, a turntable rotatably arranged in each receiving cavity, an eccentric roller fixedly arranged on the turntable, and both turntables being fixedly connected to a rotating wheel arranged in the inlet pipe through a rotating rod; the treatment tank also has an air storage cavity inside. The processing chamber inside the processing box is equipped with a cleaning assembly, which includes a cleaning scraper, a rotating shaft, and partition plates. Three partition plates are evenly distributed and fixed on the rotating shaft, with an included angle of 120 degrees between adjacent partition plates. A movement track groove is provided on the inner wall of the processing chamber, and a cleaning scraper that slides within the movement track groove is provided between adjacent partition plates.

[0007] As an optional solution of the combined urban wastewater treatment device of the present invention, the moving trajectory groove is composed of a first moving trajectory, a second moving trajectory and a third moving trajectory. The first moving trajectory is a downward-sloping arc-shaped groove structure, the second moving trajectory is a corrugated groove structure with a specific waveform, and the third moving trajectory is a smooth arc-shaped groove structure.

[0008] As an optional embodiment of the combined urban wastewater treatment device of the present invention, wherein: a rotating base is fixedly sleeved on the rotating shaft, a plurality of aeration pipes are fixedly installed on the rotating base, a cleaning scraper is provided with cleaning grooves corresponding to the number and position of the aeration pipes, an external motor is fixedly connected to the top of the rotating shaft, and the plurality of aeration pipes are all connected to the air storage chamber.

[0009] As an optional embodiment of the combined urban wastewater treatment device described in this invention, each of the partition plates is provided with a slidable blocking slider, which is slidably disposed inside the moving trajectory groove on the inner wall of the treatment tank.

[0010] As an optional embodiment of the combined urban wastewater treatment device described in this invention, the inlet pipe has a diversion channel at one end near the treatment chamber, a venturi channel is provided downstream of the diversion channel, the large flared end of the venturi channel is connected to the diversion channel, and the small flared end points to the treatment area through a nozzle. A connecting channel is also provided inside the treatment box, one end of the connecting channel is connected to the negative pressure area of ​​the venturi channel throat, and the other end is connected to the gas storage chamber.

[0011] As an optional embodiment of the combined urban wastewater treatment device described in this invention, a one-way gas valve is provided at the connection between the connecting channel and the Venturi channel.

[0012] As an optional embodiment of the combined urban wastewater treatment device described in this invention, the rotating chassis is provided with a plurality of sludge discharge troughs arranged in a circular array, each sludge discharge trough is provided with a sludge discharge pipe, and a sludge discharge hopper is fixedly installed inside the air storage chamber, and the outlet end of the sludge discharge hopper is connected to the outside.

[0013] As an optional embodiment of the combined urban wastewater treatment device of the present invention, each of the receiving cavities is further provided with a pressure plate slidably disposed therein, the position of the pressure plate corresponding to the movement trajectory of the eccentric roller, and each of the receiving cavities is further provided with a corrugated airbag, the air outlets of the two corrugated airbags being connected to an air storage cavity opened inside the treatment box.

[0014] As an alternative to the combined urban wastewater treatment device described in this invention, the eccentric rollers on the two turntables are symmetrically arranged, and each corrugated airbag is connected to an external air source through a one-way valve.

[0015] As an optional embodiment of the combined urban wastewater treatment device of the present invention, the inlet pipe is provided with a filter plate, and the filter plate is provided with a blocking plate on the side facing the water flow. The bottom of the blocking plate is elastically connected to the treatment tank wall through a sliding rod and a connecting spring. Under normal conditions, the blocking plate closes the inlet of the discharge tank, and the bottom end of the sliding rod is slidably disposed in the output end of the embedded cylinder.

[0016] The present invention has the following beneficial effects: This combined urban wastewater treatment device, by installing a rotating wheel inside the inlet pipe, not only utilizes the flow of sewage to drive the rotating wheel to rotate, which in turn drives a symmetrically arranged eccentric roller mechanism to alternately compress corrugated air chambers, achieving continuous aeration without external power and effectively improving phosphorus removal efficiency, but also utilizes hydraulic action to achieve automatic detection and cleaning of impurities on the filter plate. Combined with the redundant design of the built-in cylinder, it significantly enhances the reliability of slag discharge. The overall structure ingeniously converts fluid kinetic energy into mechanical motion and the air pressure required for aeration, achieving energy self-sufficiency and continuous and stable operation of the process.

[0017] This urban wastewater treatment system uses a combined design to divide the treatment chamber into three functional zones: treatment, transition, and settling. A water level sensor automatically triggers the rotation of these zones, enabling seamless integration of the dosing, reaction, and sedimentation processes. A specially shaped track guides the cleaning scraper to perform scraping of adhering sediment, oscillation mixing to promote reaction, and static sedimentation in different areas. This effectively prevents blockage of the aeration pipes and inner walls, improving reagent utilization and phosphorus removal efficiency. The system boasts high overall integration, achieving fully automated control of sediment scraping, zoned circulation, and sludge discharge, significantly enhancing the stability, efficiency, and automation level of phosphorus removal treatment.

[0018] The combined wastewater treatment device for this city cleverly utilizes the residual pressure of the influent to drive the Venturi effect by setting a diversion channel and a Venturi channel at the end of the influent pipe. This creates a negative pressure at the throat to automatically draw gas from the gas storage chamber, achieving efficient gas-liquid mixing and microbubble jetting. This significantly enhances the stirring intensity, mass transfer efficiency, and phosphorus flocculation effect within the treatment zone. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the local processing box of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the first cross-sectional structure of the local processing box of the present invention.

[0020] Figure 5 This is a schematic diagram of the second cross-sectional structure of the local processing box of the present invention; Figure 6 This is a schematic diagram of the cleaning component structure of the present invention; Figure 7 This is a schematic diagram of the first cross-sectional structure inside the local processing box of the present invention; Figure 8 This is a schematic diagram of the second cross-sectional structure inside the local processing box of the present invention.

[0021] In the diagram: 1. Processing box; 2. Cleaning component; 101. Liquid inlet pipe; 102. Discharge tank; 103. Rotating wheel; 104. Filter plate; 105. Sliding rod; 106. Connecting spring; 107. Sealing plate; 108. Air storage chamber; 109. Aeration pipe; 110. Turntable; 111. Eccentric roller; 112. Pressure plate; 113. Corrugated airbag; 114. Moving trajectory groove; 1141. First moving trajectory; 1142. Second moving trajectory; 1143. Third moving trajectory; 115. Venturi groove; 116. Connecting groove; 117. Diverting groove; 201. Cleaning scraper; 202. Cleaning scraper groove; 203. Rotating shaft; 204. Divider plate; 205. Rotating chassis; 206. Sludge discharge hopper; 207. Sludge discharge pipe. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1, please refer to Figures 1-8 After the urban sewage undergoes solid-liquid separation, it still needs to undergo phosphorus removal treatment. The phosphorus removal device involved in this solution includes a treatment tank 1, on which an inlet pipe 101 is installed. A rotating wheel 103 is set between the inlet pipe 101 and the treatment tank 1. The sewage after solid-liquid separation can be continuously fed into the treatment tank 1 through the inlet pipe 101. During this process, the flowing sewage will drive the rotating wheel 103 to rotate. This structural design utilizes the kinetic energy of the sewage flow to directly drive the rotating parts, realizing the initial utilization of energy.

[0024] To prevent residual solid impurities in the wastewater after preliminary solid-liquid separation, this solution includes a filter plate 104 inside the inlet pipe 101. The mesh of the filter plate 104 can effectively intercept most small particulate solid impurities.

[0025] According to the design of this scheme, the filter plate 104 may be gradually clogged by impurities in the water during long-term operation. It should be noted that the mesh size of the filter plate 104 is specially designed to trap most solid impurities on the water-facing side of the filter plate 104, rather than clogging the inside of the mesh. In other words, after cleaning the impurities accumulated on the water-facing side of the filter plate 104, the filter plate 104 can restore its filtration function and be reused. In addition, the clogging will reduce the water flow in the inlet pipe 101, which will cause the upstream water level of the clogging area to rise and the local pressure to increase.

[0026] At this time, the solid impurities accumulated on the side of the filter plate 104 facing the water flow will act on the sealing plate 107 together with their gravity and the increased water pressure. When the combined force exceeds the pre-tightening force of the connecting spring 106, the sealing plate 107 will be pushed down and drive the sliding rod 105 to slide. When the sealing plate 107 moves down to be flush with the inlet of the discharge tank 102, the connecting channel is opened. The continuously entering high-pressure sewage will generate fluid impact force, which will flush the accumulated solid impurities out of the treatment tank 1 through the discharge tank 102, thereby realizing automatic hydraulic sludge removal.

[0027] After the slag discharge process is completed, the pressure acting on the sealing plate 107 decreases accordingly. The restoring force of the connecting spring 106 will push the sliding rod 105 and the sealing plate 107 to reset, resealing the inlet of the discharge channel 102, and the system will return to normal operation. This mechanism uses the system's own hydraulic power to achieve automatic cleaning of impurities. The process includes the entire process from blockage warning and channel opening to impurity removal, without the need for external energy input.

[0028] It should be noted that the bottom end of the sliding rod 105 is slidably disposed within the output end of the embedded cylinder. In automatic slag discharge mode, the sliding rod 105 can slide freely within this output end without affecting its movement. When special working conditions occur, such as impurities causing automatic slag discharge to fail, the user can activate the embedded cylinder, whose output end will forcefully push the sliding rod 105 and the sealing plate 107 downwards to mechanically open the channel for material discharge. Through this setting, the built-in forced drive device is used as a redundant backup for the automatic mode, effectively improving the reliability of the slag discharge system and its ability to cope with complex working conditions, ensuring the continuous and stable operation of the system.

[0029] Since a pair of symmetrically arranged receiving cavities are provided inside the processing box 1, and a turntable 110 is rotatably arranged in each receiving cavity, and an eccentric roller 111 is fixedly arranged on the turntable 110, and the two turntables 110 are fixedly connected to the rotating wheel 103 through a rotating rod, the rotation of the rotating wheel 103 will synchronously drive the two turntables 110 to rotate in the same way. A pressure plate 112 is also slidably arranged in each receiving cavity, and its position corresponds to the movement trajectory of the eccentric roller 111. The eccentric rollers 111 on the two turntables 110 are symmetrically arranged, that is, when the eccentric roller 111 on one turntable 110 rotates to the highest point, the eccentric roller 111 on the other turntable 110 is at the lowest point. This symmetrically arranged eccentric roller 111 mechanism converts the rotational motion into two reciprocating motions with opposite phases.

[0030] Since each receiving cavity is also equipped with a corrugated airbag 113, initially, one corrugated airbag 113 is in a compressed state, while the other corrugated airbag 113 is in an inflated state. When the rotating wheel 103 drives the turntable 110 to rotate, the eccentric roller 111 in the higher position presses down on the corresponding pressure plate 112, causing the pressure plate 112 to compress the corrugated airbag 113 below it. At the same time, the other eccentric roller 111 in the lower position rises with the rotation of the turntable 110, releasing the pressure of the corresponding pressure plate 112, allowing the corrugated airbag 113 to expand and be released from the outside. A one-way valve draws in gas, and each corrugated airbag 113 is connected to an external gas source via a one-way valve, ensuring that gas can only enter the airbag from the external gas source. The outlets of both corrugated airbags 113 are connected to the gas storage chamber 108 inside the treatment tank 1. Therefore, the compressed corrugated airbags 113 can discharge their internal gas into the gas storage chamber 108. Since the gas storage chamber 108 is connected to several aeration pipes 109 installed on the treatment tank 1, the gas entering the gas storage chamber 108 is eventually evenly released into the sewage in the treatment tank 1 through the aeration pipes 109, achieving the aeration function. This alternating compression and expansion action ensures that gas is continuously forced into the gas storage chamber 108.

[0031] Since the sewage injection is continuous, the rotating wheel 103 and the two rotating disks 110 it drives will also rotate continuously. The two symmetrically arranged eccentric rollers 111 cause the two pressure plates 112 to alternately compress their respective corrugated air bags 113: when one corrugated air bag 113 is compressed and vented, the other corrugated air bag 113 is in the air intake state. This alternating working mode allows the two corrugated air bags 113 to supply gas to the air storage chamber 108 in turn. This alternating gas supply mechanism realizes a continuous and uninterrupted gas supply to the aeration pipe 109, providing a stable and efficient aeration effect for the sewage phosphorus removal process.

[0032] Example 2 aims to improve upon Example 1 by addressing the issue of phosphorus precipitation and adhesion during wastewater removal. For details, please refer to Example 1. Figures 1-8 Because a cleaning component 2 is installed in the processing cavity inside the processing box 1, and the rotating shaft 203 in the cleaning component 2 is rotatably installed inside the processing cavity, the top end of the rotating shaft 203 is fixedly connected to an external motor, and three partition plates 204 are evenly distributed and fixed on the rotating shaft 203 in the circumferential direction, and the included angle between adjacent partition plates 204 is 120 degrees. Through the arrangement of the three partition plates 204, the processing cavity is effectively divided into three functional areas: processing area, transition area and resting area.

[0033] Furthermore, in the initial state of the equipment, the wastewater introduced into the treatment tank 1 from the inlet pipe 101 is designed to directly enter one of the cavities in the three functional areas. At the same time, the operator puts in the phosphorus removal agent inside the treatment tank 1, with the dosing target clearly directed towards the treatment area.

[0034] Because the wastewater will precipitate after being treated with phosphorus removal agents and aerated by aeration pipe 109 inside the treatment area, and these precipitates are attached to the top surface of the rotating chassis 205, the surface of the partition plate 204, and the inner wall of the treatment chamber before the partition plate 204 rotates, in order to avoid excessive precipitation reducing phosphorus removal efficiency and to achieve centralized treatment of precipitates, this solution sets up a water level sensor (not shown in the figure) in the treatment area of ​​treatment tank 1. When the wastewater level reaches the sensor detection position, it sends a signal to the controller, and the controller then drives the external motor to rotate 120 degrees. In other words, through the linkage design of water level sensing and motor, the automatic response to the sediment accumulation state in the treatment area is effectively realized, providing triggering conditions for subsequent cleaning actions.

[0035] The rotation of the external motor will drive the fixedly connected rotating shaft 203 to rotate synchronously. Since the rotating base 205 is fixedly sleeved on the rotating shaft 203, and several aeration pipes 109 are fixedly installed on the rotating base 205, the aeration pipes 109 will also rotate. It should be noted that although the aeration pipes 109 rotate with the rotating base 205, the connection between them and the air storage chamber 108 adopts a dynamic sealing structure (such as a mechanical seal or rotary joint). This structure can effectively prevent gas leakage in the air storage chamber 108 and ensure a continuous and stable supply of air to the aeration pipes 109. Since there is a cleaning scraper 201 that can be limited and slidable between adjacent partition plates 204, and since a moving trajectory groove 114 is opened on the inner wall of the processing chamber, the moving trajectory groove 114 is composed of a first moving trajectory 1141, a second moving trajectory 1142 and a third moving trajectory 1143. The cleaning scraper 201 is slidably installed in the moving trajectory groove 114 by a slider. In other words, the aforementioned rotating linkage structure ensures that the cleaning mechanism and the processing area move synchronously during the functional transition, providing a power basis for the removal of sediment.

[0036] It should be noted that each partition plate 204 is equipped with a sliding blocking slider, which is also slidably installed inside the moving track groove 114 on the inner wall of the treatment tank 1. Through the sealing effect of the blocking slider, the fluid mutual seepage between the treatment area, transition area and settling area that may be caused by the opening of the moving track groove 114 is avoided. In other words, this setting can avoid the risk of cross-area pollution to a certain extent, ensure the independence of each functional area in the treatment process and the phased treatment effect, and guarantee the final effluent water quality.

[0037] It should be noted that the cleaning scraper 201 initially located in the processing area has its slider embedded in the first moving trajectory 1141. Since the first moving trajectory 1141 is an arc sloping downwards, when the partition plate 204 rotates with the shaft, it will force the cleaning scraper 201 to slide downwards along the trajectory towards the second moving trajectory 1142. This setting can effectively utilize the forced guiding effect of the sloping trajectory to convert the rotational motion into the linear downward movement of the cleaning scraper 201. During this downward movement, the edge of the cleaning scraper 201 continuously scrapes the surface of the partition plate 204, thereby effectively peeling off the adhering deposits on the surface of the partition plate 204.

[0038] Because the cleaning scraper 201 has cleaning grooves 202 corresponding to the number and position of the aeration pipes 109, when the scraper moves down to the height of the aeration pipes 109, the cleaning grooves 202 are precisely fitted into the aeration pipes 109. As the cleaning scraper 201 continues to move down, the sediment adhering to the pipe wall of the aeration pipes 109 will be scraped off. In other words, by setting the cleaning grooves 202, the sediment on the surface of the aeration pipes 109 can be effectively and accurately removed, so as to avoid excessive sediment adhering to the surface of the aeration pipes 109, which may eventually cause blockage.

[0039] After the external motor completes a 120-degree rotation, the sewage in the original treatment zone will enter the transition zone along with the rotation of the partition plate 204. At this time, the idle chamber corresponding to the settling zone where sewage discharge has been completed will be simultaneously moved into the treatment zone. The idle chamber will then receive the newly flowing sewage and restart the phosphorus removal agent dosing and aeration treatment process. When the treatment zone reaches the preset water level again, the external motor will repeat the aforementioned rotation command. In other words, this setting can effectively realize the cyclic rotation of the treatment zone, transition zone and settling zone, so that the dosing, reaction and sedimentation stages of sewage treatment are seamlessly connected in continuous operation.

[0040] With the secondary start of the external motor, the cleaning scraper 201 will enter the second moving trajectory 1142 corresponding to the transition zone along the moving trajectory groove 114. Since the second moving trajectory 1142 is designed as a corrugated trajectory with a specific waveform, the cleaning scraper 201 will perform vertical reciprocating motion in the sewage. In other words, the rotational power can be converted into the periodic oscillation of the cleaning scraper 201 by using the constraint effect of the corrugated trajectory, thus creating directional turbulence conditions for the sewage in the transition zone.

[0041] Meanwhile, the reciprocating oscillation of the cleaning scraper 201 effectively enhances the turbulence intensity of the fluid in the transition zone. This disturbance also effectively promotes the forced mixing of unreacted phosphorus removal agents with wastewater, shortens the agent diffusion path, accelerates solid-liquid mass transfer efficiency, and thus effectively improves the formation rate and removal rate of phosphorus precipitation.

[0042] When the sewage is transferred from the transition zone to the settling zone, the cleaning scraper 201 simultaneously slides into the third moving track 1143. The third moving track 1143 is a smooth arc-shaped groove structure. In other words, when the motor is stopped, the third moving track 1143 can effectively maintain the stationary position of the cleaning scraper 201, providing a zero-interference sedimentation environment for the sewage, thereby achieving efficient separation of sediment and clear liquid.

[0043] It should be noted that when the cleaning scraper 201 moves with the system to the transition zone and enters the second moving trajectory 1142, it will undergo high-frequency, small-amplitude vertical reciprocating motion under the constraint of the corrugated trajectory. This violent oscillation causes strong shear flow and turbulence on the surface of the cleaning scraper 201, which can effectively peel off and remove the loose sediment attached to its surface. At the same time, the sewage rich in unreacted agents in the transition zone flows over its surface, which also plays a role in flushing and chemical cleaning. During the process of the cleaning scraper 202 being inserted into and removed from the aeration pipe 109, its inner wall will slide and mechanically rub against the outer surface of the aeration pipe 109. This "scraping others" action is also a "scraping itself" process, which can effectively remove the sediment attached to the inner wall of the cleaning scraper 202. At the same time, when the cleaning scraper 201 reciprocates in the transition zone, the groove structure of the cleaning scraper 202 will guide the sewage to flow in and out at high speed, forming a continuous fluid flushing of the inner wall of the groove, thereby preventing the sediment from being stably attached and accumulated in the groove.

[0044] In summary, the cleaning scraper 201 and its cleaning groove 202 are not static components. Their self-cleaning ability is constituted by their own movement, vibration, sliding, and the scouring and chemical action of the fluid environment during operation, which ensures their working efficiency and reliability under long-term operation and avoids the problem of functional failure due to their own clogging.

[0045] It should be noted that the settling process will be completed before the motor starts again, and the clear liquid after solid-liquid separation can be discharged from the treatment tank 1 through the drain pipe. After the clear liquid is discharged, since a mud discharge hopper 206 is fixedly installed inside the air storage chamber 108 of the treatment tank 1, and a discharge arc surface with an inclined angle is opened inside the rotating chassis 205, and several mud discharge grooves are opened around the circumference of the rotating chassis 205, each of which is equipped with a mud discharge pipe 207. Each mud discharge pipe 207 is equipped with an electrically controlled one-way valve (not shown in the figure). When the rotating chassis 205 rotates with the mud discharge pipe 207... After rotating to the settling area, with the next rotation, the operator can control the opening of the electrically controlled one-way valve in the corresponding sludge discharge pipe 207. Once the valve is open, the sediment that has undergone solid-liquid separation in the settling area will flow along the discharge arc under gravity and ultimately be quickly discharged through the sludge discharge pipe 207 into the fixed sludge discharge hopper 206 below, and finally discharged outside the treatment tank 1. It should be noted that this setup ensures that most of the sediment is discharged above the rotating chassis 205; even if a small amount of residual sediment remains, it will not affect the wastewater treatment effect in the next cycle. After the rotation is complete, the chamber, having completed sedimentation and cleaning, moves into the treatment area to receive new inflowing wastewater and restart the treatment cycle.

[0046] Example 3 aims to improve the treatment efficiency of wastewater within the treatment area. This example is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1-8 Since the wastewater still retains some fluid pressure after driving the rotating wheel 103 in the inlet pipe 101, this design incorporates a diversion channel 117 at the end of the inlet pipe 101 near the treatment chamber to utilize this energy. This means that some wastewater is diverted into the diversion channel 117 before entering the treatment chamber. This diversion structure effectively utilizes the residual pressure of the inlet water, providing a high-pressure power source for the subsequent Venturi effect.

[0047] Because a Venturi trough 115 is provided downstream of the diversion trough 117, its structural features are that both ends are funnel-shaped and the middle is a slender throat. The large funnel end is connected to the diversion trough 117, and the small funnel end is pointed to the treatment area through a nozzle. When the high-pressure diverted sewage flows through the throat of the Venturi trough 115 at high speed, the flow velocity reaches its peak. According to Bernoulli's principle, the pressure here drops to the lowest point, forming a significant negative pressure zone. In other words, the pressure energy of the diverted sewage can be converted into kinetic energy and a strong negative pressure can be created by using the Venturi trough 115, which provides the core conditions for gas suction.

[0048] Because a connecting groove 116 is provided inside the treatment tank 1, one end of the connecting groove 116 is connected to the negative pressure zone of the throat of the Venturi trough 115, and the other end is connected to the gas storage chamber 108. A gas one-way valve is provided at the connection between the connecting groove 116 and the Venturi trough 115. By setting the gas one-way valve, not only can the gas be smoothly entered into the Venturi trough 115, but the sewage can also be prevented from flowing back into the gas storage chamber 108. When a negative pressure is generated in the throat of the Venturi trough 115, the gas in the gas storage chamber 108 is violently drawn in under the action of pressure difference, so that it gradually enters the Venturi trough 115 and mixes with the sewage. By using this negative pressure to automatically draw gas from the gas storage chamber 108, efficient mixing of gas and liquid phases without additional power is effectively achieved.

[0049] It should be noted that the air supply rate of the corrugated airbag 113 is much greater than the maximum air extraction rate of the Venturi system under different operating conditions. This can effectively ensure that the air storage chamber 108 always maintains positive pressure, so that the aeration pipe 109 can always output air normally.

[0050] It is worth noting that the driving water flow of this Venturi system originates from the water inlet pipe 101. Therefore, the greater the water inlet flow, the higher the rotation speed of the rotating wheel 103, and the more gas the corrugated air bladder 113 produces. At the same time, the faster the ejector water flow rate, the stronger the Venturi effect, and the amount of gas drawn from the air storage chamber 108 increases synchronously. In other words, the aeration intensity can be adjusted according to the water inlet flow through the above settings, thereby always maintaining the dynamic optimal match between air, water, and treatment load.

[0051] Once the mixed gas-water two-phase flow forms a uniform jet rich in microbubbles in the Venturi tank 115, it can be injected into the treatment zone at high speed through the nozzle. This high-energy jet can generate a strong stirring effect on the sludge, reagents and wastewater in the treatment zone, which not only effectively improves the mass transfer efficiency and mixing degree in the treatment zone, but also effectively accelerates the precipitation of phosphorus and the formation of flocs.

[0052] When the influent flow rate decreases, the suction and mixing intensity of the Venturi system automatically weakens, and the system enters a low-energy operation state. In addition, the aeration pipe 109 installed in the system serves as the main aeration method and is activated when the influent flow rate is extremely low or during maintenance of the Venturi tank 115, ensuring that basic biological treatment is not interrupted.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0054] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A combined urban wastewater treatment device, comprising a treatment tank, characterized in that: The processing box is equipped with a liquid inlet pipe. A pair of symmetrically arranged receiving cavities are provided inside the processing box. A turntable is rotatably arranged in each receiving cavity. An eccentric roller is fixedly arranged on the turntable. Both turntables are fixedly connected to the rotating wheel arranged in the liquid inlet pipe through a rotating rod. A gas storage cavity is also provided inside the processing box. The processing chamber inside the processing box is equipped with a cleaning assembly, which includes a cleaning scraper, a rotating shaft, and partition plates. Three partition plates are evenly distributed and fixed on the rotating shaft in the circumferential direction. The included angle between adjacent partition plates is 120 degrees. A moving trajectory groove is opened on the inner wall of the processing chamber. A cleaning scraper that slides within the moving trajectory groove is provided between adjacent partition plates. The moving trajectory groove is composed of a first moving trajectory, a second moving trajectory and a third moving trajectory. The first moving trajectory is a downward-sloping arc-shaped groove structure, the second moving trajectory is a wavy track groove structure with a specific waveform, and the third moving trajectory is a smooth arc-shaped groove structure. A rotating base is fixedly sleeved on the rotating shaft, and several aeration pipes are fixedly installed on the rotating base. The cleaning scraper has cleaning grooves corresponding to the number and position of the aeration pipes. An external motor is fixedly connected to the top of the rotating shaft, and several aeration pipes are connected to the air storage chamber. The rotating chassis is provided with a number of mud discharge troughs arranged in a circular array. Each mud discharge trough is provided with a mud discharge pipe inside, and a mud discharge hopper is fixedly installed inside the air storage chamber. The outlet end of the mud discharge hopper is connected to the outside. Each of the aforementioned accommodating cavities is also slidably equipped with a pressure plate, the position of which corresponds to the movement trajectory of the eccentric roller. Each of the aforementioned accommodating cavities is also equipped with a corrugated airbag, the air outlets of which are connected to an air storage chamber opened inside the processing box. The two symmetrically arranged eccentric rollers cause the two pressure plates to alternately compress their respective corrugated airbags.

2. The combined urban wastewater treatment device according to claim 1, characterized in that: Each of the partition plates is equipped with a slidable blocking slider, which is slidably disposed inside the movement trajectory groove on the inner wall of the processing box.

3. The combined urban wastewater treatment device according to claim 1, characterized in that: A diversion groove is provided at one end of the inlet pipe near the processing chamber. A venturi groove is provided downstream of the diversion groove. The large flared end of the venturi groove is connected to the diversion groove, and the small flared end is pointed to the processing area through a nozzle. A connecting groove is also provided inside the processing box. One end of the connecting groove is connected to the negative pressure area of ​​the venturi groove throat, and the other end is connected to the gas storage chamber.

4. A combined urban wastewater treatment device according to claim 3, characterized in that: A gas check valve is provided at the connection between the connecting groove and the venturi groove.

5. A combined urban wastewater treatment device according to claim 1, characterized in that: Each of the corrugated airbags is connected to an external air source via a one-way valve.

6. A combined urban wastewater treatment device according to claim 1, characterized in that: A filter plate is installed inside the inlet pipe, and a blocking plate is installed on the side of the filter plate facing the water flow. The bottom of the blocking plate is elastically connected to the treatment tank wall through a sliding rod and a connecting spring. Under normal conditions, the blocking plate closes the inlet of the discharge tank, and the bottom end of the sliding rod is slidably installed in the output end of the embedded cylinder.

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