Multi-stage oxidation sludge degradation device

Abstract

The utility model relates to multistage oxidation sludge degradation device belongs to sewage treatment equipment technical field, including primary digestion pond, secondary digestion pond, tertiary digestion pond, four digestion pond, five digestion pond and coagulation sedimentation tank in proper order series connection, and is equipped with aeration tank and sedimentation tank in each digestion pond, and the aeration tank is divided into multiple aeration single pool, and the aeration single pool is equipped with microporous aerator, and the sedimentation tank of each is connected mud pipe, sludge return pipe, sludge return pump, and the other end of sludge return pipe is connected in the front end of corresponding same grade aeration tank. The utility model discloses through five series connection aeration - sedimentation unit's step - by - step oxidation and concentration, forms gradient degradation environment, and the low dissolved oxygen of front section promotes hydrolytic acidification bacteria metabolism, and the macromolecular organic matter is decomposed, and the dissolved oxygen of back section is gradually promoted and strengthens the mineralization of aerobic bacteria, and the degradation efficiency is promoted, and sludge concentration is reduced, realizes sludge organic matter phased efficient degradation, and the treatment efficiency and the effect of reduction are good, and the resource utilization rate is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewage treatment equipment, specifically relating to a multi-stage oxidation sludge degradation device. Background Technology

[0002] With the acceleration of urbanization and the widespread adoption of wastewater treatment facilities, the production of sludge, an inevitable byproduct of wastewater treatment, is increasing year by year, posing a serious challenge to environmental governance and sustainable development. Sludge treatment is difficult; dewatering and stabilization processes are energy-intensive, leading to high treatment costs. Landfilling and incineration pose a risk of secondary pollution, and countries are increasingly stringent in their emission standards for pollutants from sludge. Traditional sludge disposal methods such as landfilling and incineration not only occupy large amounts of land resources but also may cause secondary pollution, failing to meet increasingly stringent environmental protection requirements. Therefore, developing efficient, economical, and environmentally friendly sludge reduction technologies to achieve source reduction and resource utilization of sludge has become a research hotspot in the field of environmental engineering.

[0003] Waste sludge is a byproduct of biological treatment units in wastewater treatment, mainly composed of microbial metabolic residues, undegraded organic matter, inorganic particles, and colloidal substances. The treatment and disposal of waste sludge is a crucial step in wastewater treatment. Traditional waste sludge treatment methods, such as landfill, incineration, land application, and anaerobic digestion, have played a role in long-term practice. However, with increasingly stringent environmental standards and growing demand for resource recovery, their limitations are becoming increasingly apparent. Traditional sludge treatment processes suffer from insufficient treatment efficiency and volume reduction, as well as low resource utilization rates, making it difficult to meet the sustainable development requirements under the "dual carbon" (carbon dioxide, carbon sequestration, and carbon emissions) goals. Utility Model Content

[0004] Therefore, it is necessary to provide a multi-stage oxidation sludge degradation device to address the existing technical problems.

[0005] To solve the problems of the existing technology, the technical solution adopted by this utility model is as follows: The multi-stage oxidation sludge degradation device includes a primary digester, a secondary digester, a tertiary digester, a quaternary digester, a quinary digester, and a coagulation sedimentation tank connected in series. The primary digester is connected to the raw water inlet pipe, and the coagulation sedimentation tank is connected to the effluent pipe. Each digester stage is equipped with an aeration tank and a sedimentation tank. The aeration tank is divided into multiple aeration single tanks by multiple guide plates. Each aeration single tank is equipped with a microporous aerator at the bottom. Each sedimentation tank stage is equipped with a sludge suction pipe at the bottom, which is connected to a sludge return pipe. The sludge return pipe is equipped with a sludge return pump, and the other end of the sludge return pipe is connected to the front end of the corresponding aeration tank of the same stage. Each sedimentation tank stage is equipped with a guide cylinder in the middle. The bottom of the guide cylinder is equipped with a conical slow-flow baffle coaxial with it. The upper part of the guide cylinder is connected to a connecting pipe, and the other end of the connecting pipe is connected to the rear end of the corresponding aeration tank.

[0006] As a preferred embodiment, each aeration tank is equipped with a sludge guide pipe extending to its lower part at the front end. The top of the sludge guide pipe is connected to the sludge return pipe, and an inlet pipe is fixed to the upper part of the sludge guide pipe. The inlet pipe of the primary digester is connected to the raw water inlet pipe, and the inlet pipes of the secondary, tertiary, quaternary, and quinary digesters are connected to the upper part of the previous stage sedimentation tank. The height of the inlet pipes on the primary, secondary, tertiary, quaternary, and quinary digesters gradually decreases. The sludge guide pipe extends to the lower part of the front end of the aeration tank, achieving bottom inlet and top outlet, increasing the treatment effect. Furthermore, the sludge returned by the sludge guide pipe is initially mixed with the water entering through the inlet pipe within the sludge guide pipe, and the piping setup is reduced.

[0007] As a preferred option, the inlet pipe is inclined, with one end of the inlet pipe connected to the sludge guide pipe being lower than the other end, so that the sludge flowing back into the sludge guide pipe will not obstruct the water overflowing from the inlet pipe from entering.

[0008] As a preferred embodiment, the outer edge of the flow-slowing baffle is provided with an upward-curved arc-shaped flow-guiding bend, so that the water entering the flow-guiding tube has an upward tendency when flowing through the flow-slowing baffle, preventing it from impacting the sludge settled at the bottom. The flow-slowing baffle is provided with two mounting holes symmetrical about its central axis, and a connecting rod is fixed in the mounting hole. The top of the connecting rod is fixed to the outer wall of the flow-guiding tube.

[0009] As a preferred embodiment, two positioning protrusions symmetrical about their central axis are fixed on the outer wall of the guide tube, and the top of the connecting rod is provided with a positioning groove that cooperates with the positioning protrusions, which facilitates the quick positioning and installation of the flow-slowing baffle.

[0010] As a preferred embodiment, the top front and rear sides of the guide tube are fixed with support plates, and the support plates are provided with arc-shaped welding grooves.

[0011] As a preferred embodiment, the coagulation sedimentation tank includes a coagulation tank and an effluent sedimentation tank. The coagulation tank is equipped with a double-layer paddle mixer, and the effluent sedimentation tank has an effluent weir at the top, with an effluent pipe connected to the effluent sedimentation tank at the effluent weir. The coagulation tank with double-layer paddle mechanical agitation ensures more uniform mixing of sludge and chemicals. Combined with the effluent sedimentation tank, this results in good sludge-water separation, reduces sludge moisture content, and significantly lowers subsequent dewatering treatment costs.

[0012] As a preferred design, each microporous aerator is connected to a branch duct. Branch ducts in the same level of aeration tank connect to the same secondary main duct, and multiple secondary main ducts connect to the same main duct. The main duct is connected to an aeration fan. Valves are installed on the branch ducts, secondary main ducts, and main duct. The aeration system uses independent branch ducts for air supply, with branches connecting to the microporous aerators in each aeration tank at each level. The branch ducts are equipped with segmented valves, allowing for precise control of the dissolved oxygen gradient at each level. This design aligns with the laws of microbial succession, enriching facultative bacteria in the pre-stage and directionally cultivating nitrifying bacteria and autotrophic sludge-degrading bacteria in the post-stage, forming a highly efficient composite microbial community system and optimizing the microbial community structure.

[0013] The advantages of this utility model compared with the prior art are: Through the step-by-step oxidation and concentration of five-stage series aeration-sedimentation units, a gradient degradation environment is formed. The low dissolved oxygen in the front stage promotes the metabolism of hydrolytic acidifying bacteria and decomposes large molecular organic matter. The dissolved oxygen in the back stage is gradually increased to enhance the mineralization of aerobic bacteria, improve degradation efficiency, reduce sludge concentration, and achieve efficient degradation of sludge organic matter in stages.

[0014] Multiple baffles are installed in each aeration tank to form an interconnected multi-compartment structure, which facilitates the control of aeration intensity and uniform distribution, while extending the sludge retention time, allowing recalcitrant substances to fully contact microorganisms, avoiding short-circuiting, and reducing the overall footprint. The multi-stage buffer design makes the system's resistance to shock loads outstanding, with a higher resistance to load shocks than a single-stage system.

[0015] Each sedimentation tank is equipped with a return port at the bottom. Incompletely degraded sludge is returned to the front end of the aeration tank of the same stage through the bottom sludge pumping pipe, sludge return pipe and sludge return pump to form a local circulation and realize dynamic return to enhance reaction efficiency.

[0016] The combination of the guide tube and the slow-flow baffle allows the sludge to enter the sedimentation zone at a low speed. Combined with the bottom inclined sedimentation tank design, the solid-liquid separation efficiency is high and the loss of activated sludge is effectively controlled. Attached Figure Description

[0017] Figure 1 This is a system flowchart of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the top structure of the primary digester; Figure 4 This is a schematic diagram of the mud guide pipe structure; Figure 5 This is a schematic diagram of the structure at the flow-slowing baffle. The numbers on the map are: 1. Raw water inlet pipe; 2. Inlet pipe; 3. Sludge return pipe; 4. Aeration tank; 5. Sludge return pump; 6. Sludge pumping pipe; 7. Sedimentation tank; 8. Sludge guide pipe; 9. Baffle plate; 10. Connecting pipe; 11. Microporous aerator; 12. Branch duct; 13. Secondary main duct; 14. Main duct; 15. Aeration blower; 16. Double-layer paddle mixer; 17. Outlet pipe; 18. Outlet sedimentation tank; 19. Coagulation tank; 20. Flow guide cylinder; 21. Slow-flow baffle; 22. Support plate; 23. Positioning protrusion; 24. Connecting rod; 25. Arc-shaped flow guide bend. Detailed Implementation

[0018] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0019] Example 1, Reference Figures 1 to 5 The multi-stage oxidation sludge degradation device includes a primary digester, a secondary digester, a tertiary digester, a quaternary digester, a quinary digester, and a coagulation sedimentation tank 7 connected in series. The primary digester is connected to the raw water inlet pipe 1, and the coagulation sedimentation tank is connected to the effluent pipe 17. Each digester is equipped with an aeration tank and a sedimentation tank 7. The aeration tank is divided into multiple aeration single tanks 4 by multiple guide plates 9. Each aeration single tank 4 is equipped with a microporous aerator 11 at the bottom. Each sedimentation tank 7 is equipped with a sludge suction pipe 6 at the bottom. The sludge suction pipe 6 is connected to a sludge return pipe 3. The sludge return pipe 3 is equipped with a sludge return pump 5. The other end of the sludge return pipe 3 is connected to the front end of the corresponding aeration tank of the same stage. Each sedimentation tank 7 is equipped with a guide cylinder 20 in the middle. The bottom of the guide cylinder 20 is equipped with a conical slow-flow baffle 21 coaxial with it. The upper part of the guide cylinder 20 is connected to a connecting pipe 10. The other end of the connecting pipe 10 is connected to the rear end of the aeration tank of the same stage.

[0020] During operation, the high-moisture-content residual sludge raw water enters the primary digester through the raw water inlet pipe 1. After aeration in the aeration tank within the primary digester, it enters the primary sedimentation tank 7 for sedimentation. The sludge is then pumped out through the sludge pumping pipe 6 and returned to the front end of the same-stage aeration tank through the sludge return pipe 3, completing the primary digestion and concentration. The upper layer of sludge enters the next stage digester and repeats the aeration, sedimentation, and internal return process until the fifth stage digester. The upper layer of sludge enters the coagulation sedimentation tank. After coagulation and sedimentation, the upper clear liquid is discharged through the effluent pipe, and the sludge settled at the bottom is discharged through the sludge discharge pipe for further treatment.

[0021] In Example 2, based on Example 1, each aeration tank is equipped with a sludge guide pipe 8 extending to its lower part at the front end. The top of the sludge guide pipe 8 is connected to the sludge return pipe 3, and an inlet pipe 2 is fixed to the upper part of the sludge guide pipe 8. The inlet pipe 2 of the primary digester is connected to the raw water inlet pipe 1, and the inlet pipes 2 of the secondary, tertiary, quaternary, and quinary digesters are connected to the upper part of the previous sedimentation tank 7. The height of the inlet pipes 2 on the primary, secondary, tertiary, quaternary, and quinary digesters gradually decreases. The guide plate 9 divides the tank into multiple aeration single tanks 4. The sludge passes through each aeration single tank 4 in sequence, forming an "S"-shaped flow path, effectively extending the actual hydraulic retention time. The baffle guides the fluid to form a push-flow motion, and combined with the evenly distributed aerators, dead zones in the tank are eliminated, improving the volume utilization rate. The inlet pipe 2 of the five-stage digester adopts a stepped layout with progressively decreasing elevations. Through gravity flow, optimized flow pattern, and enhanced shock resistance, it solves the problems of traditional multi-stage processes that rely on power transportation, are prone to clogging, and have uneven loads. This significantly reduces energy consumption and operation and maintenance costs while improving treatment efficiency and stability. This design is a key innovation for achieving high-efficiency, energy-saving, and low-maintenance operation of multi-stage oxidation processes.

[0022] The water inlet pipe 2 is installed at an angle, and one end of the water inlet pipe 2 is lower than the other end when it is connected to the mud guide pipe 8.

[0023] The outer edge of the flow-slowing baffle 21 is provided with an upward-curving arc-shaped guide bend 25. The flow-slowing baffle 21 has two mounting holes symmetrical about its central axis. A connecting rod 24 is fixed in the mounting holes, and the top of the connecting rod 24 is fixed to the outer wall of the guide cylinder 20. The coagulation tank 19 is connected to the PAC inlet pipe and the PAM inlet pipe.

[0024] Two positioning protrusions 23, symmetrical about their central axis, are fixed on the outer side wall of the guide tube 20, and the top of the connecting rod 24 is provided with a positioning groove that cooperates with the positioning protrusions 23.

[0025] The top front and rear sides of the guide tube 20 are fixed with support plates 22, and the support plates 22 are provided with arc-shaped welding grooves. During installation, the connecting rod 24 is welded and fixed in the mounting hole, and then the positioning protrusion 23 is inserted into the positioning slot for quick positioning. Then the connecting rod 24 is welded and fixed to the guide tube 20.

[0026] The coagulation sedimentation tank 7 includes a coagulation tank 19 and an effluent sedimentation tank 18. The coagulation tank 19 is equipped with a double-layer paddle mixer 16. The effluent sedimentation tank 18 is equipped with an effluent weir at the top. The effluent pipe 17 is connected to the effluent sedimentation tank 18 at the effluent weir.

[0027] Each microporous aerator 11 is connected to a branch duct 12. The branch duct 12 of the same level aeration tank is connected to the same secondary main duct 13. Multiple secondary main ducts 13 are connected to the same main duct 14. The main duct 14 is connected to an aeration blower 15. Valves are provided on the branch duct 12, the secondary main duct 13 and the main duct 14.

[0028] The specific workflow is as follows: raw water enters through the raw water inlet pipe 1 at the top of the primary digester and enters the bottom of the primary aeration tank through the sludge guide pipe 8 connected to the inlet pipe 2. In the four aeration tanks 4 of the primary aeration tank, a portion of the sludge undergoes a preliminary aeration reaction to dissolve the sludge. Then, it enters the guide tube 20 of the primary sedimentation tank 7 through the connecting pipe 10 at the top of the primary aeration tank, and slowly enters the primary sedimentation tank 7 through the guide tube 20 and the slow-flow baffle 21 at the bottom of the guide tube 20. In the primary sedimentation tank 7, a portion of the sludge settles and is returned to the front end of the primary aeration tank through the sludge return pump 5. The upper sludge flows by gravity into the next primary digester to continue the reaction, and the above steps are repeated until the fifth-stage digester. After five stages of digestion and return, the sludge concentration is significantly reduced. The digested sludge then enters the coagulation tank 19, where it coagulates into flocs under the action of coagulant and stirring. The separation of clear water and sludge is completed in the effluent sedimentation tank 18. The upper clear liquid is discharged through the effluent pipe 17, and the settled sludge is discharged through the sludge discharge pipe for further treatment.

[0029] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-stage oxidative sludge degradation device, comprising a primary digester, a secondary digester, a tertiary digester, a quaternary digester, a quinary digester, and a coagulation sedimentation tank connected in series, wherein the primary digester is connected to the raw water inlet pipe (1), and the coagulation sedimentation tank is connected to the effluent pipe (17), characterized in that: Each digester is equipped with an aeration tank and a sedimentation tank (7). The aeration tank is divided into multiple aeration single tanks (4) by multiple guide plates (9). Each aeration single tank (4) is equipped with a microporous aerator (11) at the bottom. Each sedimentation tank (7) is equipped with a sludge suction pipe (6) at the bottom. The sludge suction pipe (6) is connected to a sludge return pipe (3). The sludge return pipe (3) is equipped with a sludge return pump (5). The other end of the sludge return pipe (3) is connected to the front end of the corresponding aeration tank of the same level. Each sedimentation tank (7) is equipped with a guide cylinder (20) in the middle. The bottom of the guide cylinder (20) is equipped with a conical slow-flow baffle (21) coaxial with it. The upper part of the guide cylinder (20) is connected to a connecting pipe (10). The other end of the connecting pipe (10) is connected to the rear end of the aeration tank of the same level.

2. The multi-stage oxidation sludge degradation device according to claim 1, characterized in that, Each aeration tank is equipped with a sludge guide pipe (8) extending into its lower part. The top of the sludge guide pipe (8) is connected to the sludge return pipe (3). An inlet pipe (2) is fixed on the upper part of the sludge guide pipe (8). The inlet pipe (2) of the first-stage digester is connected to the raw water inlet pipe (1). The inlet pipes (2) of the second-stage digester, third-stage digester, fourth-stage digester, and fifth-stage digester are connected to the upper part of the previous sedimentation tank (7). The height of the inlet pipes (2) on the first-stage digester, second-stage digester, third-stage digester, fourth-stage digester, and fifth-stage digester gradually decreases.

3. The multi-stage oxidation sludge degradation device according to claim 2, characterized in that, The water inlet pipe (2) is set at an angle, and the end of the water inlet pipe (2) connected to the mud guide pipe (8) is lower than the other end.

4. The multi-stage oxidation sludge degradation device according to claim 1, characterized in that, The outer edge of the flow-slowing baffle (21) is provided with an upward-curving arc guide bend (25). The flow-slowing baffle (21) is provided with two mounting holes symmetrical about its central axis. A connecting rod (24) is fixed in the mounting hole. The top of the connecting rod (24) is fixed on the outer wall of the guide tube (20).

5. The multi-stage oxidation sludge degradation device according to claim 4, characterized in that, Two positioning protrusions (23) are fixed on the outer side wall of the guide tube (20) and are symmetrical about its central axis. The top of the connecting rod (24) is provided with a positioning groove that cooperates with the positioning protrusions (23).

6. The multi-stage oxidation sludge degradation device according to claim 5, characterized in that, The top front and rear sides of the guide tube (20) are fixed with support plates (22), and the support plates (22) are provided with arc-shaped welding grooves.

7. The multi-stage oxidation sludge degradation device according to claim 1, characterized in that, The coagulation sedimentation tank includes a coagulation tank (19) and an effluent sedimentation tank (18). The coagulation tank (19) is equipped with a double-layer paddle mixer (16). The effluent sedimentation tank (18) is equipped with an effluent weir at the top. The effluent pipe (17) is connected to the effluent sedimentation tank (18) at the effluent weir.

8. The multi-stage oxidation sludge degradation device according to claim 1, characterized in that, Each microporous aerator (11) is connected to a branch pipe (12). The branch pipes (12) on the same level of aeration tank are connected to the same secondary main pipe (13). Multiple secondary main pipes (13) are connected to the same main pipe (14). The main pipe (14) is connected to an aeration blower (15). Valves are provided on the branch pipes (12), secondary main pipes (13) and main pipes (14).

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