Integrated high-precision deslagging and sand-removing aeration system for sewage treatment plant

Abstract

The present application relates to sewage treatment technical field, disclose a kind of integrated high-precision deslagging and desanding aeration system of sewage treatment plant, including sewage treatment tank, its front end is equipped with water inlet, channel is equipped in pool along the direction of water flow extension, water inlet is connected with channel inlet end by flange one;Inner inflow type fine grid, by bolt fixed in channel inner wall front end, grid gap≤5mm;High-efficiency grit aeration tank, it is set to sewage treatment tank rear end, its water inlet is communicated with channel outlet end by gravity flow pipeline, water outlet is connected with the water outlet pipeline of sewage treatment tank front end by flange two;Rotational flow aeration system, integrated in high-efficiency grit aeration tank.The present application is installed by inner inflow type fine grid, rotational flow aeration system and high-efficiency grit tank in sewage treatment tank, realize integration, it is favorable to reduce floor area, especially suitable for underground sewage treatment plant or upgrading project.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an integrated high-precision slag and sand removal aeration system for wastewater treatment plants. Background Technology

[0002] In traditional wastewater treatment processes, the wastewater first passes through a fine screen to intercept small suspended solids (such as hair, fibers, and plastics), and then enters a grit chamber to remove floating solids such as grease and inorganic particles such as sand and gravel.

[0003] However, fine screens, grit chambers, and aeration tanks are usually designed separately, which presents the following problems:

[0004] 1. Large footprint: It requires three independent structures, which increases construction costs, especially for projects with limited land.

[0005] 2. High hydraulic losses: The water undergoes three stages of treatment, leading to increased energy consumption (e.g., the booster pump needs to overcome greater resistance);

[0006] 3. Complex operation and management: Separate maintenance of the bar screen, aeration tank and grit chamber is required, increasing labor costs;

[0007] 4. Unstable sand removal efficiency: Traditional grit chambers (such as vortex grit chambers) have a low removal rate for fine sand (0.1-0.2mm) (usually only 50%).

[0008] 5. Environmental and construction issues: Split structures have long construction cycles, high carbon emissions, and may cause problems such as sand leakage and blockage due to improper connection.

[0009] Therefore, there is an urgent need for an integrated high-precision slag and sand removal aeration system for wastewater treatment plants to solve the above problems. Summary of the Invention

[0010] To address the technical problems mentioned in the background section, this invention provides an integrated high-precision slag and sand removal aeration system for wastewater treatment plants.

[0011] This invention is achieved using the following technical solution: an integrated high-precision slag and sand removal aeration system for wastewater treatment plants, comprising:

[0012] The sewage treatment tank has an inlet at its front end and a channel extending along the water flow direction inside the tank. The inlet is connected to the inlet end of the channel via a flange.

[0013] An internal flow fine screen is fixed to the front end of the inner wall of the channel with bolts, and the screen gap is ≤5mm;

[0014] The high-efficiency grit aeration tank is located at the rear end of the sewage treatment tank. Its inlet is connected to the outlet end of the channel through a gravity flow pipe, and its outlet is connected to the effluent pipe at the front end of the sewage treatment tank through flange two.

[0015] A swirling aeration system, integrated into a high-efficiency grit aeration tank, includes;

[0016] The disc is fixed to the support frame at the bottom of the high-efficiency grit aeration tank by welding.

[0017] The main aeration pipe runs vertically through the center hole of the disc and is dynamically sealed to the disc via a rotating sealing ring.

[0018] The rotating shaft component is coaxially sleeved to the outer wall of the aeration main pipe via a bearing;

[0019] Multiple "L"-shaped aeration branch pipes are radially welded and fixed to the outer surface of the rotating shaft component at the long arm end, and the short arm end extends in the direction of water flow. Aeration holes with a diameter of 0.5-1mm are evenly opened on the surface of the branch pipe, with a hole density of ≥20 holes / m.

[0020] Among them, the L-shaped aeration branch pipe is driven only by the aeration airflow, and the aeration branch pipe rotates around the rotating shaft component, pushing the water flow to form a high-speed vortex of >0.3m / s.

[0021] As a further improvement to the above scheme, the water distribution channel has its inlet and outlet ends integrally formed by concrete pouring. The outlet end is connected to the inlet flanges of two parallel high-efficiency sedimentation and aeration tanks through a diversion pipe. The diversion pipe is equipped with a manual flow regulating valve.

[0022] As a further improvement to the above scheme, the phase liquid conveyor is horizontally set in the channel, and its inlet is connected to the slag outlet of the internal flow fine screen through the slag guide trough.

[0023] As a further improvement to the above scheme, the screenings press is located outside the sewage treatment pond, and its inlet is connected to the outlet of the phase liquid conveyor via flange four.

[0024] As a further improvement to the above solution, a dry sand suction pump is fixed to the side wall of the sand hopper of the high-efficiency sand settling aeration tank by bolts, and its inlet is connected to the bottom of the sand settling hopper through a sand suction pipe.

[0025] As a further improvement to the above solution, the integrated sand washing and separating machine is installed outside the sewage treatment tank, and its sand inlet is connected to the outlet of the dry sand suction pump through flange five.

[0026] As a further improvement to the above solution, the backwash water tank is fixed to the bottom of the sewage treatment tank by welding with bracket two;

[0027] The backwash pump for the grit chamber has its inlet connected to the outlet flange of the backwash water tank via a pipe, and its outlet connected to the flushing nozzles on the inner wall of the high-efficiency grit chamber aeration tank via a pipe.

[0028] As a further improvement to the above solution, the fine screen backwash pump has its inlet connected to the outlet of the backwash water tank via a tee fitting, and its outlet connected to the flushing nozzle of the internal flow fine screen via a pipe.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. This invention integrates the internal flow fine screen, swirl aeration system and high-efficiency grit chamber into the sewage treatment tank, which helps to reduce the footprint and is especially suitable for underground sewage treatment plants or upgrading projects.

[0031] 2. This invention reduces the pump lift head through integrated design, and combines a swirling aeration system with gravity flow optimization for efficient grit settling, which helps to reduce operating power consumption.

[0032] 3. This invention reduces independent components by using integrated equipment, which helps to reduce the failure rate.

[0033] 4. This invention achieves seamless integration of internal flow fine screen, swirling aeration system and high-efficiency grit chamber. It adopts a combination of disc vortex composite grit chamber + swirling aeration + mechanical fine screen, which helps to reduce the hydraulic transition zone and reduce head loss.

[0034] 5. This invention reduces the sand content of sludge in subsequent processes through physical interception, aeration cyclone, and efficient grit settling, which helps to reduce the amount of flocculant added.

[0035] 6. This invention effectively separates sand particles from organic suspended matter. Aeration increases the water flow rate per unit time, resulting in higher sand settling efficiency and lower water content, which facilitates resource utilization.

[0036] 7. This invention reduces the amount of concrete used through modular design, which is beneficial to reducing carbon emissions throughout the entire life cycle. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of an integrated high-precision slag and sand removal aeration system for a wastewater treatment plant proposed in this invention.

[0038] Figure 2 This is a partial structural schematic diagram of the integrated high-precision slag and sand removal aeration system for wastewater treatment plants according to the present invention.

[0039] Figure 3 This is a schematic diagram of the swirling aeration system of the present invention.

[0040] Explanation of key symbols:

[0041] 1. Wastewater treatment tank; 2. Internal flow fine screen; 3. High-efficiency grit aeration tank; 4. Water distribution channel; 5. Phase-liquid conveyor; 6. Screenings press; 7. Dry sand suction pump; 8. Sand washing and separating integrated machine; 9. Backwash water tank; 10. Grit chamber backwash pump; 11. Fine screen backwash pump; 12. Aeration main pipe; 13. Aeration branch pipe; 14. Aeration holes; 15. Rotary shaft components; 16. Disc. Detailed Implementation

[0042] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0043] Example:

[0044] Please combine Figures 1-3 This embodiment of a high-precision integrated slag and sand removal aeration system for a wastewater treatment plant includes a wastewater treatment tank 1, an internal flow fine screen 2, a high-efficiency grit settling and aeration tank 3, and a swirling aeration system.

[0045] Specifically, the sewage treatment tank 1 is configured as a rectangular frame structure.

[0046] Wastewater treatment tank 1 has an inlet at its front end and a channel extending along the water flow direction inside the tank. The inlet is connected to the inlet end of the channel via a flange.

[0047] Specifically, the sewage flows into the channel from the inlet of sewage treatment pond 1.

[0048] The internal flow fine screen 2 is fixed to the front end of the inner wall of the channel by bolts, and the screen gap is ≤5mm.

[0049] Specifically, the internal flow fine screen 2 is equipped with mechanical fine screens, and there are two of them. The channel has two inlets, and the two internal flow fine screens 2 are respectively installed in the two inlets, so that sewage can enter the two internal flow fine screens 2. The use of two internal flow fine screens 2 can improve the efficiency of removing screenings from sewage.

[0050] The high-efficiency grit aeration tank 3 is located at the rear end of the sewage treatment tank 1. Its inlet is connected to the outlet end of the channel through a gravity flow pipe, and its outlet is connected to the outlet pipe at the front end of the sewage treatment tank 1 through flange 2.

[0051] A swirling aeration system, integrated within the high-efficiency grit aeration tank 3, includes;

[0052] Disc 16 is fixed to the support frame at the bottom of the high-efficiency grit aeration tank 3 by welding;

[0053] Specifically, the disc 16 is conical with a cone angle of 30°, and the surface is evenly covered with guide holes of 5 mm in diameter, with a hole spacing of 10 mm; the vertical distance between the disc and the short arm end of the L-shaped aeration branch pipe 13 is 50 mm, which guides the water flow to form a vortex.

[0054] The aeration main pipe 12 vertically penetrates the center hole of the disc 16 and is dynamically sealed to the disc 16 through a rotating sealing ring.

[0055] Specifically, the rotary sealing ring adopts a polytetrafluoroethylene lip seal, which is nested between the inner wall of the center hole of the disc 16 and the aeration main pipe 12. Its embedded spring clamp ensures that the sealing lip is in close contact with the outer wall of the main pipe when rotating; the sealing ring has a pressure resistance of ≥0.2MPa and a leakage rate of <1%.

[0056] The rotating shaft component 15 is coaxially sleeved to the outer wall of the aeration main pipe 12 via a bearing;

[0057] Multiple "L"-shaped aeration branch pipes 13 have their long arm ends radially welded and fixed to the outer surface of the rotating shaft component 15, and their short arm ends extend in the direction of water flow. Aeration holes 14 with a diameter of 0.5-1mm are evenly opened on the surface of the branch pipes, with a hole density of ≥20 holes / m.

[0058] Among them, the L-shaped aeration branch pipe 13 is driven only by the aeration airflow, and the aeration branch pipe 13 rotates around the rotating shaft component 15, pushing the water flow to form a high-speed vortex >0.3m / s.

[0059] Specifically, the high-efficiency sedimentation tank is configured as a disc / vortex composite type. Wastewater passes sequentially through an internally inflow fine screen 2 and a high-efficiency grit aeration tank 3 within the wastewater treatment tank 1 to achieve oil, sludge, and sand removal. Thus, by installing both the internally inflow fine screen 2 and the high-efficiency grit aeration tank 3 within the wastewater treatment tank 1, achieving integration, it helps reduce the floor space by 40%–50%, making it particularly suitable for underground wastewater treatment plants or upgrading projects. The integrated design reduces the pump lift head, and combined with the gravity flow optimization of the high-efficiency grit aeration tank, operating power consumption is reduced by 10%–15%. The integrated equipment reduces independent components, lowering the failure rate by 30%.

[0060] Secondly, the internal flow fine screen 2 and the high-efficiency grit aeration tank 3 are seamlessly connected. The combination of disc 16 vortex composite grit aeration + swirling aeration + mechanical fine screen is beneficial to reduce the hydraulic transition zone and reduce head loss.

[0061] Furthermore, by combining physical interception, swirl aeration, and high-efficiency grit removal, the sludge sand content in subsequent processes such as primary sedimentation tanks and biological treatment tanks is reduced, thus decreasing the amount of flocculant required. Sand particles are effectively separated from suspended organic matter, resulting in grit with a lower moisture content (≤60%), facilitating resource utilization such as in building backfill. The modular design reduces concrete usage and lowers carbon emissions throughout the entire lifecycle.

[0062] In this embodiment, prefabricated steel structures or fiberglass materials can be used, which can shorten the construction cycle by more than 50% compared to traditional concrete structures. This is suitable for green construction, reducing on-site wet work and reducing dust and construction waste.

[0063] Secondly, the high-efficiency grit aeration tank 3 improves the removal rate of fine sand ≥0.1mm to over 90% through the dual action of vortex composite grit settling + swirl aeration + inclined plate settling.

[0064] It can be applied to municipal wastewater treatment plants: suitable for upgrading and renovation or new projects with limited land.

[0065] Industrial wastewater pretreatment: such as simultaneous removal of fibers and sand particles from wastewater from the food and textile industries.

[0066] Rural decentralized sewage treatment: Modular design facilitates transportation and rapid installation.

[0067] Secondly, the internal flow fine screen 2 and the high-efficiency grit aeration tank 3 can be bolted to the sewage treatment tank 1.

[0068] Optionally, such as Figure 1 As shown, to improve the sand removal efficiency of wastewater, the integrated high-precision slag and sand removal aeration system of the wastewater treatment plant also includes a water distribution channel 4. Its inlet end and outlet end are integrally formed by concrete pouring. The outlet end is connected to the inlet flanges of two parallel high-efficiency grit settling and aeration tanks 3 through a diversion pipe. A manual flow regulating valve is installed on the diversion pipe.

[0069] Specifically, by setting up a water distribution channel 4 and two high-efficiency grit aeration tanks 3, the sewage enters the water distribution channel 4 after passing through two internal flow fine screens 2, and the water distribution channel 4 distributes the sewage to the two high-efficiency grit aeration tanks 3, which helps to improve the efficiency of sand and oil removal.

[0070] Optionally, such as Figure 1 As shown, to facilitate the discharge of screenings, the integrated high-precision slag and sand removal aeration system of the wastewater treatment plant also includes a phase-liquid conveyor 5 and a screenings press 6. The phase-liquid conveyor 5 is horizontally set in the channel, and its inlet is connected to the screenings outlet of the internal flow fine screen 2 through a slag guide trough. The screenings press 6 is set outside the wastewater treatment tank 1, and its inlet is connected to the outlet of the phase-liquid conveyor 5 through flange 4.

[0071] Specifically, the phase liquid conveyor 5 is arranged laterally in the left-right direction and is positioned behind the two internal flow fine screens 2.

[0072] Specifically, the screenings in the internal flow fine screen 2 are discharged into the phase liquid conveyor 5, and the phase liquid conveyor 5 is used to transport the screenings to the screenings press 6 for compaction and dewatering.

[0073] Optionally, such as Figure 1 and Figure 2 As shown, to facilitate sand removal, the integrated high-precision slag and sand removal aeration system of the sewage treatment plant also includes a dry sand suction pump 7, which is bolted to the side wall of the sand hopper of the high-efficiency sand settling aeration tank 3. Its inlet is connected to the bottom of the sand settling hopper through a sand suction pipe. The integrated sand washing and separating machine 8 is set outside the sewage treatment tank 1, and its sand inlet is connected to the outlet of the dry sand suction pump 7 through flange five.

[0074] Specifically, two dry sand suction pumps 7 are provided, installed at the left and right ends inside the sewage treatment tank 1. The integrated sand washing and separating machine 8 is installed outside the sewage treatment tank 1, and the dry sand suction pumps 7 are connected to the integrated sand washing and separating machine 8.

[0075] Specifically, using two dry sand suction pumps 7 to suck sand from the high-efficiency sedimentation and aeration tank 3 into the integrated sand washing and separating machine 8 is beneficial to improving sand suction efficiency.

[0076] Optionally, such as Figure 2 As shown, the structure reduces backwashing. The integrated high-precision slag and sand removal aeration system for wastewater treatment plants also includes a backwash water tank 9, a grit chamber backwash pump 10, and a fine screen backwash pump 11. The backwash water tank 9 is welded and fixed to the bottom of the wastewater treatment tank 1 via a bracket. The inlet of the grit chamber backwash pump 10 is connected to the outlet flange of the backwash water tank 9 via a pipe, and the outlet is connected to the flushing nozzles on the inner wall of the high-efficiency grit chamber aeration tank 3 via a pipe. The inlet of the fine screen backwash pump 11 is shared with the outlet of the backwash water tank 9 via a tee fitting, and the outlet is connected to the flushing nozzles of the internal flow fine screen 2 via a pipe.

[0077] Specifically, by integrating the backwash water tank 9, the grit chamber backwash pump 10, and the fine screen backwash pump 11 at the lower end of the sewage treatment tank 1, it is beneficial to further reduce the footprint. Furthermore, connecting the grit chamber backwash pump 10 and the fine screen backwash pump 11 to the backwash water tank 9 allows for the use of a single backwash water tank 9 to backwash the internal flow fine screen 2 and the high-efficiency grit chamber aeration tank 3.

[0078] Optionally, such as Figure 3As shown, a swirling aeration system is used to clean small particles of screenings and grease. The system includes a main aeration pipe 12, branch aeration pipes 13, aeration holes 14, a rotating shaft assembly 15, and discs 16. Discs 16 are installed inside the high-efficiency grit aeration tank 3. The main aeration pipe 12 is installed in the center of the disc 16. The rotating shaft assembly 15 is mounted on the main aeration pipe 12, and numerous branch aeration pipes 13 are mounted on the rotating shaft assembly 15. The branch aeration pipes 13 are L-shaped, fixed to the outer surface of the rotating shaft assembly 15, and arranged in the direction of water flow. Numerous aeration holes 14 are evenly distributed on the branch aeration pipes 13. When water flows into the discs inside the high-efficiency grit aeration tank 3, a vortex is formed.

[0079] When the aeration system is activated, the "L"-shaped aeration branch pipe 13 will rotate in the direction of water flow. Activating the aeration function at this time will help the water flow to swirl at high speed, increasing the swirling speed of the water flow per unit time and the efficiency of aeration and sand removal, which is beneficial to improving the efficiency of sand and oil removal.

[0080] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An integrated high-precision slag and sand removal aeration system for wastewater treatment plants, characterized in that, include: Wastewater treatment tank (1) has an inlet at its front end and a channel extending along the water flow direction inside the tank. The inlet is connected to the channel inlet end via a flange. An internal flow fine screen (2) is fixed to the front end of the inner wall of the channel by bolts, with a screen gap of 0.5-1mm; The high-efficiency grit aeration tank (3) is set at the rear end of the sewage treatment tank (1). Its inlet is connected to the channel outlet end through a gravity flow pipe, and its outlet is connected to the outlet pipe at the front end of the sewage treatment tank (1) through flange two. A swirling aeration system, integrated into a high-efficiency grit aeration tank (3), includes; The disc (16) is fixed to the support at the bottom of the high-efficiency grit aeration tank (3) by welding; The aeration main pipe (12) penetrates vertically through the center hole of the disc (16) and is dynamically sealed to the disc (16) through a rotating sealing ring; The rotating shaft component (15) is coaxially sleeved to the outer wall of the aeration main pipe (12) via a bearing; Multiple "L"-shaped aeration branch pipes (13) have their long arm ends radially welded and fixed to the outer surface of the rotating shaft component (15), and their short arm ends extend in the direction of water flow. Aeration holes (14) with a diameter of 0.5-1mm are evenly opened on the surface of the branch pipes, with a hole density of ≥20 holes / m. Among them, the L-shaped aeration branch pipe (13) is driven only by the aeration airflow, and the aeration branch pipe (13) rotates around the rotating shaft component (15), pushing the water flow to form a high-speed vortex >0.3m / s; Also includes: The water distribution channel (4) has its inlet end and outlet end formed by concrete pouring. The outlet end is connected to the inlet flanges of two parallel high-efficiency sedimentation and aeration tanks (3) through a diversion pipe. The diversion pipe is equipped with a manual flow regulating valve. The phase liquid conveyor (5) is horizontally set in the channel, and its inlet is connected to the slag outlet of the internal flow fine screen (2) through the slag guide trough; The screenings press (6) is located outside the sewage treatment tank (1), and its inlet is connected to the outlet of the phase liquid conveyor (5) through flange four. The dry sand suction pump (7) is fixed to the side wall of the sand hopper of the high-efficiency sand settling aeration tank (3) by bolts, and its inlet is connected to the bottom of the sand settling hopper through a sand suction pipe; The integrated sand washing and separating machine (8) is set outside the sewage treatment tank (1), and its sand inlet is connected to the outlet of the dry sand suction pump (7) through flange five; The backwash tank (9) is welded to the bottom of the sewage treatment tank (1) by bracket two; The inlet of the backwash pump (10) is connected to the outlet flange of the backwash water tank (9) via a pipe, and the outlet is connected to the flushing nozzle on the inner wall of the high-efficiency grit aeration tank (3) via a pipe. The fine screen backwash pump (11) has its inlet connected to the outlet of the backwash water tank (9) via a three-way fitting, and its outlet is connected to the flushing nozzle of the internal flow fine screen (2) via a pipe.

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