A circulating sewage treatment device

Abstract

The application discloses a circulating sewage treatment equipment, which comprises a sedimentation cavity, a separation cavity, a filter cavity and a first pumping mechanism, wherein the separation cavity comprises a cavity A and a cavity B, the cavity A is used for storing sewage discharged from the upper part of the sedimentation cavity, a circulating channel and the first pumping mechanism are arranged between the cavity A and the cavity B, a separation mechanism is arranged in the cavity B, the separation mechanism is used for separating the sewage discharged from the cavity A based on the first pumping mechanism, the cavity B is communicated with the cavity A through the circulating channel, and the filter cavity is used for filtering water delivered by the separation mechanism.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a circulating wastewater treatment device. Background Technology

[0002] In wastewater treatment processes, the front-end solid-liquid separation pretreatment stage is a crucial step connecting the biological treatment unit and the terminal membrane filtration unit. Since domestic sewage and industrial wastewater typically contain large amounts of suspended particles, flocculent colloids, and organic residues, the degree to which the front-end pretreatment removes these impurities directly affects the operating load and backwashing frequency of the terminal membrane modules. Therefore, the structural design and flow path organization of the solid-liquid separation unit are of paramount importance, directly impacting the operational stability and maintenance costs of the entire wastewater treatment system.

[0003] In related technologies, multi-stage sedimentation tanks are usually connected in series with liquid pumps to carry out graded sedimentation of sewage. For example, large-particle suspended solids are intercepted in the primary sedimentation tank, and the supernatant is pumped to the secondary sedimentation tank for further mud-water separation. Finally, the effluent from the secondary sedimentation tank is pumped into the membrane filtration unit for terminal purification. In this way, the suspended solids are removed in a gradient before the sewage enters the membrane module, thereby reducing the risk of membrane fouling and ensuring that the effluent quality meets the discharge or reuse standards.

[0004] However, in a multi-stage sedimentation process, wastewater transport between different tanks relies on multiple pumps working in succession. When the wastewater contains a large amount of impurities, the pump chambers and the inner walls of the transport pipes are prone to gradual sludge buildup and blockage due to prolonged contact with wastewater containing flocculent matter and sticky particles, requiring frequent shutdowns for cleaning and maintenance. At the same time, during the repeated pumping of wastewater between different tanks, the mechanical disturbance of the liquid flow and the temperature rise generated by the pump operation can easily cause the sludge layer that has settled at the bottom of the tank to be re-rolled up. Solid particles are mixed with the supernatant again and flow with the water into the next treatment unit, resulting in the actual solid phase retention load of the terminal membrane filter module being much higher than the design expectation. This accelerates the fouling rate of the membrane module and adversely affects the continuous operation cycle of the system and the stability of the effluent quality. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a circulating sewage treatment equipment, which mainly solves the technical problems of frequent pipe blockage, secondary sludge suspension and excessive solid load of terminal membrane modules caused by multi-stage liquid pump series connection in the existing sewage treatment process.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention provides a circulating sewage treatment device, comprising: Precipitation chamber; The separation chamber includes chamber A and chamber B, wherein chamber A is used to store wastewater discharged from the upper part of the sedimentation chamber, a circulation channel and a first pumping mechanism are provided between chamber A and chamber B, a separation mechanism is provided inside chamber B, and the separation mechanism is used to separate the wastewater discharged from chamber A based on the first pumping mechanism, and chamber B is connected to the interior of chamber A through the circulation channel; A filter chamber for filtering water supplied by a separation mechanism.

[0007] Preferably, the separation mechanism includes: The funnel cavity is spindle-shaped, and the slope of the upper inner wall of the funnel cavity relative to the central axis is greater than that of the lower part, and the inner diameter of the lower part of the funnel cavity is smaller than that of the upper part. An overflow pipe is located at the upper axial part of the funnel cavity; A high-pressure pump pipe, one end of which is connected to the first pumping mechanism, and the other end extends into the funnel cavity. The position of the high-pressure pump pipe is higher than the bottom of the overflow pipe. The ear chamber is located in a ring around the upper part of the funnel cavity. A communication port is provided between the ear chamber and the overflow pipe. A negative pressure pipe is installed on one side of the ear chamber and is connected to a second pumping mechanism. One end of the second pumping mechanism extends into the filter cavity.

[0008] Preferably, the bottom of the separation mechanism is provided with a sedimentation tank, and the lower part of the separation mechanism extends to the upper part of the sedimentation tank, wherein the sedimentation tank includes: The third screen, the middle of which is penetrated through the bottom of the funnel cavity; A sludge return pump, one end of which extends into the sedimentation tank.

[0009] Preferably, the sedimentation chamber has an L-shaped structure, wherein chamber A is embedded in the concave side of the sedimentation tank, and the sedimentation chamber includes: Water inlet pipe; The inlet weir has an L-shaped structure and a first screen is vertically installed on it. A siphon tube extends from the inside of the inlet weir toward chamber A. The second screen is located at the bottom of chamber A, and the aperture of the second screen is less than or equal to that of the first screen. An aeration pipe is located at the bottom of the sedimentation tank, and a microporous aeration head is provided at the top of the aeration pipe.

[0010] Preferably, the sedimentation chamber further includes a curved baffle, which is located at the bottom of the inlet pipe. The curved baffle is arranged with an upper concave and lower convex shape relative to the inlet pipe, and the bottom of the curved baffle is inclined towards the second screen. The curved baffle is located between the inlet weir and the inlet pipe.

[0011] Preferably, one end of the sludge return pump extends to the bottom of the second screen, the sedimentation tank is funnel-shaped, and the height of the circulation channel is lower than the bottom height of the pipe extending from the first pumping mechanism into chamber A.

[0012] Preferably, the filter chamber is equipped with an MBR membrane assembly and an outlet pipe, and one end of the second pumping mechanism is connected to the MBR membrane assembly.

[0013] Preferably, the upper circumferential part of the overflow pipe is provided with a grid hole, the grid hole is matched with the shape of the connecting port, and the negative pressure intensity inside the ear chamber is much less than the water flow pressure of the high pressure pump pipe; Both the first pumping mechanism and the second pumping mechanism are circulating pumps.

[0014] Preferably, it also includes an anaerobic tank, which is connected to the sedimentation chamber via an inlet pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention utilizes a separation mechanism that divides the separation chamber into chamber A and chamber B, which are bidirectionally connected by a circulation channel. Chamber B is equipped with a high-pressure pump pipe that supplies liquid tangentially into a spindle-shaped funnel cavity. When wastewater in chamber A is pumped into the funnel cavity in a single pass by the first pumping mechanism, the fluid forms a downward outward vortex under the guidance of the variable-cone angle inner wall of the funnel cavity. As the flow cross-section gradually narrows from top to bottom, the fluid undergoes a hydraulic reversal in the narrow diameter region at the bottom. The denser solid particles are discharged from the bottom outlet under the action of centrifugal force and fall into the sedimentation tank below. Meanwhile, the liquid phase, having had its solid phase removed, is drawn together by the suction effect of the central low-pressure zone, forming an upward inward vortex. This vortex then enters the surrounding ear chamber through the grid holes around the overflow pipe and is further compressed by the negative pressure provided by the second pumping mechanism. The liquid is continuously pumped into the filtration chamber, and the liquid carrying residual solid particles in the overflow is passively returned from the upper part of chamber B to chamber A through the circulation channel to participate in the next round of cyclone separation. This allows the entire equipment to achieve continuous driving between the sedimentation, cyclone separation, circulation return and membrane filtration treatment units with only two circulation pumps. This avoids frequent clogging of pump chambers and pipelines in multi-stage series pumping processes. At the same time, the cyclone separation is completed entirely in the closed chamber by the kinetic energy of the fluid itself without the introduction of external stirring components. This eliminates the liquid temperature rise caused by mechanical agitation and the secondary suspension of settled sludge. As a result, the solid load in the water entering the terminal MBR membrane module is effectively controlled, maintaining the membrane module in a low-pollution condition for a long time and ensuring the continuous stability of the effluent quality. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the separation mechanism of the present invention; Figure 3 This is a schematic diagram of the overflow pipe structure of the present invention; In the picture: 100. Sedimentation chamber; 110. Inlet pipe; 120. Inlet weir; 121. First screen; 122. Siphon pipe; 130. Second screen; 140. Aeration pipe; 150. Curved baffle; 200. Separation chamber; 210. Chamber A; 220. Chamber B; 230. First pumping mechanism; 240. Circulation channel; 250. Separation mechanism; 251. Funnel cavity; 252. Overflow pipe; 2521. Grille hole; 253. High-pressure pump pipe; 254. Ear chamber; 255. Connecting port; 256. Negative pressure pipe; 257. Second pumping mechanism; 260. Sedimentation tank; 261. Third screen; 262. Sludge return pump; 300, Filter chamber; 310, MBR filter membrane module; 320, Outlet pipe. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] In the first embodiment, as Figure 1-3 As shown, the present invention provides a circulating sewage treatment device, comprising: Precipitation chamber 100; The separation chamber 200 includes chamber A210 and chamber B220. Chamber A210 is used to store wastewater discharged from the upper part of sedimentation chamber 100. A circulation channel 240 and a first pumping mechanism 230 are provided between chamber A210 and chamber B220. A separation mechanism 250 is provided inside chamber B220. The separation mechanism 250 is used to separate wastewater discharged from chamber A210 based on the first pumping mechanism 230. Chamber B220 is connected to the interior of chamber A210 through the circulation channel 240. The filter chamber 300 is used to filter the water source delivered by the separation mechanism 250.

[0019] In existing wastewater recycling methods, the use of excessive liquid pump components makes it easy for impurities to cause blockages in the pumps or pipes during the recycling process. Adding centrifugal equipment to further separate the settled wastewater not only increases the overall process cost, but also causes the separated sludge to repeatedly mix with the wastewater due to internal agitation and uncontrollable eddies, ultimately increasing the power consumption of the filter membrane module.

[0020] Therefore, in the first embodiment, a separation chamber 200 structure is proposed, which is mainly divided into chamber A210 and chamber B220. Chamber A210 and chamber B220 are connected based on the liquid level of the circulation channel 240. The liquid overflowing from the separation structure mainly moves from chamber B220 to chamber A210 through the circulation channel 240, and is then output to the separation mechanism 250 through the first pumping mechanism 230 to realize the overall sewage treatment cycle.

[0021] Please see Figure 1 As shown, Figure 1 This is a schematic diagram of the overall structure of a circulating wastewater treatment device provided in one embodiment of this application. It can be understood that this circulating wastewater treatment device sequentially connects the sedimentation chamber 100, the separation chamber 200, and the filtration chamber 300, and forms an internal circulation loop through the circulation channel 240 between chambers A210 and B220 within the separation chamber 200. This allows wastewater to undergo multiple rounds of solid-liquid separation in the treatment process with only one pumping lift.

[0022] Specifically, the supernatant after initial settling in the sedimentation chamber 100 is temporarily stored in chamber A210. The first pumping mechanism 230 pumps the sewage in chamber A210 into the separation mechanism 250 in chamber B220 for cyclone separation. The separated clean liquid phase is transported to the filtration chamber 300 for terminal membrane filtration. The overflow liquid generated during the separation process, i.e., the liquid phase containing a small amount of residual solid particles, is passively returned from chamber B220 to chamber A210 through the circulation channel 240, where it mixes with the newly entered sewage to be treated in chamber A210 and undergoes separation treatment again. Thus, the chambers A210 and B220 inside the separation chamber 200 together with the circulation channel 240 form a self-circulating hydraulic loop, which allows suspended particles in the wastewater that are difficult to completely separate in a single operation to undergo repeated swirling separation in this loop until they agglomerate and increase in weight, and are then discharged into the sedimentation tank 260 through the underflow port at the bottom of the separation mechanism 250, without the need to add an intermediate pump station or return pump group. This reduces the number of pumps required for the equipment while ensuring sufficient solid-liquid separation.

[0023] Based on the first embodiment, the second embodiment provides a detailed structure of the separation structure, wherein the separation mechanism 250 includes: The funnel cavity 251 is spindle-shaped, and the slope of the upper inner wall of the funnel cavity 251 relative to the central axis is greater than that of the lower part, and the inner diameter of the lower part of the funnel cavity 251 is smaller than that of the upper part. Overflow pipe 252 is located in the upper part of the funnel cavity 251 in the axial direction; the upper part of the overflow pipe 252 is provided with a grid hole 2521 in the circumferential direction, the grid hole 2521 is matched with the shape of the connecting port 255, and the negative pressure intensity inside the ear chamber 254 is much less than the water flow pressure of the high pressure pump pipe 253. Both the first pumping mechanism 230 and the second pumping mechanism 257 are circulating pumps; High-pressure pump pipe 253, one end of which is connected to the first pumping mechanism 230, and the other end extends into the funnel cavity 251. The position of the high-pressure pump pipe 253 is higher than the bottom height of the overflow pipe 252, and the high-pressure pump pipe 253 extends tangentially into the funnel cavity 251. Ear chamber 254 is arranged in a ring around the upper part of funnel cavity 251. A communication port 255 is provided between ear chamber 254 and overflow pipe 252. A negative pressure pipe 256 is installed on one side of ear chamber 254. The negative pressure pipe 256 is connected to a second pumping mechanism 257. One end of the second pumping mechanism 257 extends into the filter cavity 300. In this embodiment, the separation mechanism 250 does not use a conventional stirring structure, and therefore does not require a complex separation structure. Its main principle is that, because its height is higher than the bottom of the overflow pipe 252, when the high-pressure pump pipe 253 pumps sewage tangentially, the fluid entering the funnel cavity 251 forms a downward external vortex under the guidance of the variable cone angle cone, such as... Figure 1-2 As shown, as the flow cross-sectional area towards the bottom decreases, the fluid undergoes a hydrodynamic reversal. The denser solid phase is discharged from the bottom outlet under centrifugal force, while the liquid phase that has been desolvated is affected by the low-pressure zone of the central axis and gathers into an upward internal vortex, which is eventually led out by the overflow pipe 252. Furthermore, since the upper part of the funnel cavity 251 is surrounded by the ear chamber 254, and the top and bottom of the overflow pipe 252 are through, the output channel is formed only by the side of the overflow pipe 252 and the connecting port 255. When the ear chamber 254 forms a negative pressure inside based on the second pumping mechanism 257, the internal vortex formed upward in the middle can be continuously drawn out laterally from the ear chamber 254. If excess wastewater is generated, such as wastewater mixed with particulate matter, the upward vortex in the middle will cause the particulate matter to gather in the middle and overflow from the top of the ear chamber 254 toward the inside of the cavity B220 until the liquid inside the cavity B220 is recirculated to the cavity A210 and undergoes secondary treatment by the separation mechanism 250 so that the particulate matter can agglomerate and fall.

[0024] To further ensure that the negative pressure extracted from the ear chamber 254 is more uniform and targeted, a grid is provided on the upper part of the overflow pipe 252. The distribution of the grid ensures that the negative pressure formed inside the ear chamber 254 is mainly extracted horizontally outward from the inner wall of the overflow pipe 252, while the sewage flowing upward from the center does not have a direct impact.

[0025] Please see Figure 2 As shown, Figure 2 This is an enlarged structural schematic diagram of the separation mechanism 250 provided in one embodiment of this application. It can be understood that the core of the separation mechanism 250 lies in using the swirling motion of fluid within a specific geometric cavity to achieve the separation of the solid and liquid phases based on their density difference.

[0026] Specifically, the funnel cavity 251 is spindle-shaped, meaning that the slope of its upper inner wall relative to the central axis is greater than that of the lower part. This implies that the flow cross-section of the funnel cavity 251 narrows rapidly near the top and gradually decreases in the lower part. This variable cone angle geometry, with its steep upper section and gentle lower section, causes the wastewater pumped at high speed tangentially by the high-pressure pump pipe 253 to quickly form a stable outer vortex with a high angular velocity in the upper part of the funnel cavity 251. As the fluid spirals down the cavity wall, the cross-section gradually narrows, accelerating the vortex. Under the increasing centrifugal force, solid particles accumulate towards the cavity wall and slide down the wall surface, eventually being discharged from the bottom outlet. At the narrowest cross-section at the bottom of the funnel cavity 251, due to the drastic limitation of the flow area, the outer vortex undergoes hydraulic reversal, forming a low-pressure zone in the central region. The liquid phase, after most of the solid phase has been removed, gathers into an upward inner vortex under the action of the axial pressure gradient and enters the overflow pipe 252.

[0027] With the overflow pipe 252 being a through-hole at both the top and bottom, the overflow pipe 252 is connected to the surrounding ear chamber 254 only through the circumferentially opened grid hole 2521 at its upper part. Under the negative pressure applied by the second pumping mechanism 257, the ear chamber 254 forms an annular low-pressure area outside the overflow pipe 252. The intensity of this negative pressure is configured to be much lower than the water flow pressure of the high-pressure pump pipe 253, thereby ensuring that the dominant driving force of the swirling flow in the funnel cavity 251 is always the tangential jet of the high-pressure pump pipe 253 rather than the suction of the negative pressure in the ear chamber 254, so that the swirling flow field remains stable without being disturbed by the suction of the ear chamber 254. As the inner vortex rises along the axis of the overflow pipe 252, the liquid phase that has been basically clarified in the outer layer of the vortex is smoothly extracted through the grid hole 2521 and transported to the filter chamber 300 under the lateral traction of the negative pressure in the ear chamber 254. If the central part of the vortex still contains a small amount of particulate matter, it will continue to rise along the overflow pipe 252 and overflow from the top of the overflow pipe 252 into the chamber B220. Then it will flow back to the chamber A210 through the circulation channel 240 to wait for the next round of separation treatment, so that the suspended particles that cannot be removed in one go can gradually agglomerate and eventually settle in the process of multiple cycles.

[0028] Based on the second embodiment, the third embodiment provides a corresponding sedimentation tank 260 structure. The bottom of the separation mechanism 250 is provided with a sedimentation tank 260, and the lower part of the separation mechanism 250 extends to the upper part of the sedimentation tank 260. The sedimentation tank 260 includes: The third screen 261 is penetrated by the bottom of the funnel cavity 251 in the middle. A sludge return pump 262, one end of which extends into the sedimentation tank 260.

[0029] Specifically, this structure allows impurities that have settled in the upper part of the sedimentation tank 260 to directly enter the sedimentation tank 260 from the funnel cavity 251. The top of the sedimentation tank 260 is equipped with a third screen 261, which can prevent the aggregated sludge from moving upward again. Only when there is a lot of sludge inside the sedimentation tank 260 will the sludge return pump 262 be started until the inner sludge is pumped into the sedimentation chamber 100.

[0030] It is understood that the sedimentation tank 260 receives the concentrated sludge and solid particles discharged from the bottom outlet of the funnel cavity 251. The third screen 261 runs through the lower periphery of the funnel cavity 251 from the bottom. Its function is to isolate the solid material discharged from the bottom outlet of the funnel cavity 251 from the supernatant in the sedimentation tank 260, and to prevent the sludge that has settled at the bottom of the sedimentation tank 260 from floating back to the inside of the funnel cavity 251 due to water flow fluctuations.

[0031] The third screen 261 has a through hole in its middle that matches the outer diameter of the bottom of the funnel cavity 251. This allows the bottom outlet of the funnel cavity 251 to pass through the third screen 261 and discharge the solid material directly into the lower middle area of ​​the sedimentation tank 260. The mesh surface of the third screen 261 forms a physical barrier in the upper area of ​​the sedimentation tank 260, preventing the upward movement of the bottom sludge. When the sludge in the sedimentation tank 260 accumulates to a certain thickness, the sludge return pump 262 is activated, pumping the concentrated sludge from the bottom of the tank back into the sedimentation chamber 100 via a pipeline. This sludge mixes with the newly introduced raw wastewater from the inlet pipe 110 and participates in the next round of sedimentation and separation treatment. This achieves centralized collection and return disposal of sludge, maintaining the effective volume of the sedimentation tank 260.

[0032] The fourth embodiment differs from the above embodiments in that it provides a corresponding sedimentation chamber 100 structure. The sedimentation chamber 100 has an L-shaped structure, wherein the chamber A210 is embedded in the concave side of the sedimentation tank 260. The sedimentation chamber 100 includes: Water inlet pipe 110; The inlet weir 120 has an L-shaped structure. The inlet weir 120 is vertically provided with a first screen 121. The inlet weir 120 has a siphon tube 122 extending towards the chamber A210 inside. The second screen 130 is located at the bottom of the chamber A210, and the aperture of the second screen 130 is less than or equal to that of the first screen 121. Aeration pipe 140 is located at the bottom of sedimentation tank 260, and microporous aeration heads are provided at the top of aeration pipe 140. A curved baffle 150 is located at the bottom of the inlet pipe 110. The curved baffle 150 is arranged with an upper concave and lower convex shape relative to the inlet pipe 110, and the bottom of the curved baffle 150 is inclined towards the second screen 130. The curved baffle 150 is located between the inlet weir 120 and the inlet pipe 110.

[0033] One end of the sludge return pump 262 extends to the bottom of the second screen 130. The sedimentation tank 260 is funnel-shaped. The height of the circulation channel 240 is lower than the bottom height of the pipe inside the chamber A210 where the first pumping mechanism 230 extends.

[0034] Precipitation chamber 100 Figure 1 As shown, the chamber A210 has an embedded structure. When sewage is pumped into the sedimentation chamber 100 through the inlet pipe 110, it is first blocked by the curved baffle 150. Due to the concave-convex structure of the curved baffle 150 relative to the inlet pipe 110, when sewage enters, larger agglomerates and flocculents will move downward along the curved baffle 150. Since the water flow is directed towards the second screen 130, when the impurities inside the sewage settle, they mainly form an L-shape, with the left corner being the most affected, extending continuously to the bottom of the second screen 130. Until the water flow moves to the bottom right side of the second screen 130, it impacts the inner wall and finally forms a reverse vortex. This not only allows the sewage to pass through the second screen 130 upward, but also allows the sludge at the bottom of the second screen 130 to keep turning. Furthermore, the curved baffle 150 guides the water flow when sewage is discharged from the sedimentation chamber 100, ensuring that the sewage in the area of ​​the inlet weir 120 maintains a certain degree of sedimentation. This allows the sewage in this area to enter the chamber A210 via the siphon pipe 122 after passing through the first screen 121, thus achieving a large-area and efficient rapid screening of the sewage.

[0035] Please see Figure 1 It can be understood that the L-shaped configuration of the sedimentation chamber 100 and the embedded arrangement of the chamber A210 together form a compact spatial combination. The chamber A210 is embedded in the lateral concave area of ​​the sedimentation tank 260, so that the sedimentation chamber 100 and the separation chamber 200 form an interlocking structure in the planar layout, reducing the overall planar footprint of the equipment.

[0036] Specifically, after the inlet pipe 110 introduces the raw sewage into the sedimentation chamber 100, the sewage first impacts the concave surface of the curved baffle 150. The curved baffle 150 has a concave-convex configuration, that is, its surface facing the inlet pipe 110 is concave and its surface facing away from the inlet pipe 110 is convex. This causes large-diameter flocs and heavy particles in the water flow to be guided downward after impacting the baffle and slide down along the convex back of the baffle to the bottom corner of the sedimentation chamber 100, while the main body of the water flow flows towards the second screen 130 after bypassing the lower edge of the baffle.

[0037] The inlet weir 120 has an L-shaped structure, and a first screen 121 is provided on its vertical wall. Wastewater entering the area of ​​the inlet weir 120 must first be filtered by the first screen 121 before it can enter the interior of chamber A210 through the siphon pipe 122. Due to the deflection and guiding effect of the curved baffle 150 on the water flow, the water flow velocity in the area of ​​the inlet weir 120 is relatively low, creating relatively stagnant hydraulic conditions for further gravity sedimentation of suspended particles. This results in the water in this area containing only lighter and finer suspended particles. The first screen 121 here performs the function of fine filtration and interception, blocking the remaining fine particles outside the inlet weir 120.

[0038] The aeration pipe 140 and microporous aeration heads installed at the bottom of the sedimentation tank 260 continuously supply dissolved oxygen to the water in the sedimentation tank 260, making the sedimentation tank 260 also an aerobic biological treatment zone, where organic pollutants in the wastewater are degraded by aerobic microorganisms. One end of the sludge return pump 262 extends to the bottom area of ​​the second screen 130, allowing the sludge deposited in this area to be periodically pumped out and returned to the front end of the sedimentation chamber 100, mixed with the influent, and re-entering the sedimentation and separation cycle to maintain the sludge layer thickness at the bottom of the sedimentation chamber 100 and chamber A210 within a reasonable range.

[0039] Furthermore, this embodiment also provides a corresponding subsequent processing structure, namely, the filter chamber 300 is provided with an MBR filter membrane assembly 310 and an outlet pipe 320, and one end of the second pumping mechanism 257 is connected to the MBR filter membrane assembly 310; the overall structure also includes an anaerobic tank, which is connected to the sedimentation chamber 100 through an inlet pipe 110.

[0040] Specifically, this significantly reduces impurities in the wastewater after secondary treatment inside the circulation chamber and outputs it to the filter chamber 300 for final filtration. This filtration can greatly remove residual particulate matter or oil in the wastewater, allowing the water output from the MBR membrane module 310 to be directly discharged from the outlet pipe 320. When needed, an anaerobic tank can be placed before the sedimentation chamber 100, and the sedimentation chamber 100 can be used as an aerobic tank. That is, an aeration pipe 140 is provided at the bottom of the sedimentation chamber 100 and extends to the top of the sedimentation chamber 100. After the treated wastewater in the anaerobic tank is discharged, it will enter the sedimentation chamber 100. Based on the treatment of the wastewater in the sedimentation chamber 100, the secondary centrifugation under the action of the circulation chamber reduces the filtration pressure that the subsequent MBR filter membrane module 310 needs to bear.

[0041] It is understandable that after the cyclone separation and circulation treatment by the separation mechanism 250, the solid particle content in the liquid phase transported from the ear chamber 254 to the filter chamber 300 via the second pumping mechanism 257 has been significantly reduced. Under this low solid load condition, the MBR membrane module 310 in the filter chamber 300 performs terminal interception of residual micro-suspended solids and colloidal substances, and the permeate is discharged through the outlet pipe 320. Since the front-end separation mechanism 250 has intercepted most of the solid particles in the circulation loop of the sedimentation tank 260 and the separation chamber 200, the membrane fouling rate experienced by the MBR membrane module 310 is significantly lower than that of traditional processes, the membrane cleaning cycle is extended, and the operating energy consumption is reduced.

[0042] In an optional embodiment of this application, an anaerobic tank is further provided at the front end of the sedimentation chamber 100, and the anaerobic tank is connected to the sedimentation chamber 100 through an inlet pipe 110. The anaerobic tank provides an anaerobic biochemical treatment environment for the wastewater. After the raw wastewater completes pretreatment reactions such as anaerobic phosphorus release or hydrolysis acidification in the anaerobic tank, it is discharged into the sedimentation chamber 100 through the inlet pipe 110 for subsequent aerobic treatment and solid-liquid separation. This allows the entire circulating wastewater treatment equipment to adapt to more complex influent water quality conditions, including but not limited to applications in municipal sewage treatment plants, integrated wastewater treatment systems in small industrial parks, and decentralized rural sewage treatment devices.

[0043] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circulating sewage treatment device, characterized in that, include: Precipitation chamber (100); A separation chamber (200) includes a chamber A (210) and a chamber B (220), wherein chamber A (210) is used to store wastewater discharged from the upper part of the sedimentation chamber (100), a circulation channel (240) and a first pumping mechanism (230) are provided between chamber A (210) and chamber B (220), a separation mechanism (250) is provided inside chamber B (220), the separation mechanism (250) is based on the first pumping mechanism (230) and is used to separate wastewater discharged from chamber A (210), and chamber B (220) is connected to the interior of chamber A (210) through the circulation channel (240); A filter chamber (300) is used to filter the water source delivered by the separation mechanism (250).

2. The circulating sewage treatment equipment according to claim 1, characterized in that, The separation mechanism (250) includes: The funnel cavity (251) is spindle-shaped, and the slope of the upper inner wall of the funnel cavity (251) relative to the central axis is greater than that of the lower part. The inner diameter of the lower part of the funnel cavity (251) is smaller than that of the upper part. Overflow pipe (252), the overflow pipe (252) is located in the upper part of the funnel cavity (251) in the axial direction; A high-pressure pump pipe (253) is connected at one end to the first pumping mechanism (230) and at the other end to the inside of the funnel cavity (251). The high-pressure pump pipe (253) is positioned higher than the bottom of the overflow pipe (252) and extends tangentially into the inside of the funnel cavity (251). The ear chamber (254) is located in a ring around the upper part of the funnel cavity (251). A communication port (255) is provided between the ear chamber (254) and the overflow pipe (252). A negative pressure pipe (256) is installed on one side of the ear chamber (254). The negative pressure pipe (256) is connected to the second pumping mechanism (257). One end of the second pumping mechanism (257) extends into the filter cavity (300).

3. The circulating sewage treatment equipment according to claim 2, characterized in that, The bottom of the separation mechanism (250) is provided with a sedimentation tank (260), and the lower part of the separation mechanism (250) extends to the upper part of the sedimentation tank (260). The sedimentation tank (260) includes: The third screen (261) has its center penetrated by the bottom of the funnel cavity (251); A sludge return pump (262) has a pipe extending from one end into the sedimentation tank (260).

4. The circulating sewage treatment equipment according to claim 3, characterized in that, The sedimentation chamber (100) has an L-shaped structure, wherein chamber A (210) is embedded in the recessed side of the sedimentation tank (260), and the sedimentation chamber (100) includes: Water inlet pipe (110); The inlet weir (120) has an L-shaped structure. The inlet weir (120) is vertically provided with a first screen (121). The inlet weir (120) has a siphon tube (122) extending towards the chamber A (210) inside. The second screen (130) is located at the bottom of chamber A (210), and the aperture of the second screen (130) is less than or equal to that of the first screen (121). An aeration pipe (140) is located at the bottom of a sedimentation tank (260), and a microporous aeration head is provided at the top of the aeration pipe (140).

5. A circulating sewage treatment device according to claim 4, characterized in that, The sedimentation chamber (100) also includes a curved baffle (150), which is located at the bottom of the inlet pipe (110). The curved baffle (150) is arranged with an upper concave and lower convex shape relative to the inlet pipe (110), and the bottom of the curved baffle (150) is inclined towards the second screen (130). The curved baffle (150) is located between the inlet weir (120) and the inlet pipe (110).

6. A circulating sewage treatment device according to claim 5, characterized in that, One end of the sludge return pump (262) extends to the bottom of the second screen (130), the sedimentation tank (260) is funnel-shaped, and the height of the circulation channel (240) is lower than the bottom height of the pipe extending from the first pumping mechanism (230) into the chamber A (210).

7. A circulating sewage treatment device according to claim 2, characterized in that, The filter chamber (300) is equipped with an MBR membrane assembly (310) and an outlet pipe (320), and one end of the second pumping mechanism (257) is connected to the MBR membrane assembly (310).

8. A circulating sewage treatment device according to claim 2, characterized in that, The overflow pipe (252) is provided with a grid hole (2521) in the upper circumferential direction. The grid hole (2521) matches the shape of the connecting port (255). The negative pressure intensity inside the ear chamber (254) is much smaller than the water flow pressure of the high pressure pump pipe (253). Both the first pumping mechanism (230) and the second pumping mechanism (257) are circulating pumps.

9. A circulating sewage treatment device according to claim 1, characterized in that, It also includes an anaerobic tank, which is connected to a sedimentation chamber (100) via an inlet pipe (110).

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