High-efficiency aerobic granular sludge degassing system based on internal circulation degassing

Abstract

The utility model provides an efficient degassing system for aerobic granular sludge based on internal circulation degassing, which relates to the field of biological sewage treatment and comprises an aerobic reactor and an internal circulation degassing unit, the aerobic reactor is provided with a water inlet and an effluent weir, and an aerator is arranged inside the aerobic reactor; the internal circulation degassing unit comprises a degassing cylinder and a gas collecting cover arranged above the degassing cylinder, a guide cylinder is arranged in the degassing cylinder, the guide cylinder is opened up and down, the upper part of the guide cylinder is an inlet and is connected with an effluent weir through a guide pipe, a guide sheet is arranged in the guide cylinder, and an inclined baffle fixed on the inner wall of the degassing cylinder is arranged on the outer side of the guide cylinder; a water outlet in the upper part of the degassing cylinder is connected with the water inlet through a circulating pump; the degassing cylinder is communicated with the reactor through the flow guide pipe, the degassed sludge returns to the reactor through the circulating pump to form a closed loop, and through multi-mechanism collaborative degassing, the problem of particle floating caused by bubble adhesion, air bag and floc entrainment can be effectively solved, and the degassing effect is good.

Description

A High-Efficiency Degassing System for Aerobic Granular Sludge Based on Internal Circulation Degassing Technical Field

[0001] This utility model relates to the field of wastewater biological treatment technology, specifically to an efficient degassing system for aerobic granular sludge based on internal circulation degassing. Background Technology

[0002] In the field of biological wastewater treatment, aerobic granular sludge technology is widely used due to its high efficiency in removing organic matter, nitrogen, and phosphorus. For example, patent document CN113800727A discloses a wastewater biological processor. Through the combined action of an aerobic reactor body, a micro-nano aeration device, and aerobic granular sludge bacteria, the aerobic reactor body has a high sludge concentration, high dissolved oxygen efficiency, high volumetric loading, small volume, high mass transfer efficiency, low aeration energy consumption, and high treatment efficiency, and does not require a secondary sedimentation tank.

[0003] However, the gases (such as nitrogen and methane) generated during the operation of existing aerobic granular sludge treatment systems can easily cause the particles to float, affecting system performance; while existing degassing technologies (such as gravity degassing) have problems such as low efficiency, high energy consumption, or damage to sludge properties. Summary of the Invention

[0004] This invention addresses the aforementioned problems in the prior art by providing a highly efficient degassing system for aerobic granular sludge based on internal circulation degassing, thereby solving the problem of particle floating in aerobic granular sludge.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A high-efficiency degassing system for aerobic granular sludge based on internal circulation degassing, characterized in that it includes an aerobic reactor and an internal circulation degassing unit. The aerobic reactor is provided with an inlet and an outlet weir, and an aerator is installed inside the aerobic reactor. The internal circulation degassing unit includes a degassing cylinder and a gas collection hood installed above the degassing cylinder. A guide cylinder is installed inside the degassing cylinder. The guide cylinder is open at the top and bottom. The upper part of the guide cylinder is the inlet and is connected to the outlet weir through a guide pipe. The lower part of the guide cylinder is the outlet. A guide plate is installed inside the guide cylinder. An inclined baffle is fixed to the inner wall of the degassing cylinder on the outside of the guide cylinder. The outlet located at the top of the degassing cylinder is connected to the inlet through a circulation pump.

[0006] Furthermore, the guide tube is located at the center of the degassing cylinder, and the guide tube is fixed to the inner wall of the degassing cylinder by a bracket.

[0007] Furthermore, the guide vane has a spiral structure.

[0008] Furthermore, the baffle is fixed to the inner wall of the degassing cylinder at an upward angle and forms a preset angle with the inner wall of the degassing cylinder.

[0009] Furthermore, the baffle is provided with multiple layers in the vertical direction, and each layer contains multiple baffles arranged in an array along the axial direction of the degassing cylinder.

[0010] Furthermore, the baffles between adjacent upper and lower layers are arranged in an alternating pattern in the vertical direction.

[0011] The beneficial effects of this utility model are as follows: This utility model uses an aerobic reactor and an internal circulation degassing unit connected in sequence. The internal circulation degassing unit consists of a degassing cylinder, a gas collection hood, and a circulation pump. The degassing cylinder is connected to the reactor through a guide pipe. After degassing, the sludge is returned to the reactor through the circulation pump, forming a closed loop. Through multi-mechanism synergistic degassing, it can effectively solve the problem of particle floating caused by bubble adhesion, air bladders, and floc entrainment, resulting in excellent degassing effect. Attached Figure Description

[0012] Figure 1 is a structural schematic diagram of an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of the cross-sectional structure along the BB direction in Figure 1;

[0014] Figure 3 is a schematic diagram of the cross-sectional structure along direction AA in Figure 1;

[0015] In the diagram: 1. Aerobic reactor, 2. Internal circulation degassing unit, 3. Circulation pump, 4. Aerator, 5. Inlet, 6. Outlet weir, 7. Degassing cylinder, 8. Gas collection hood, 9. Guide cylinder, 10. Guide pipe, 11. Guide vane, 12. Baffle, 13. Outlet. Detailed Implementation

[0016] The principles and features of this utility model are described below. The embodiments given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0017] As shown in Figure 1, the aerobic granular sludge high-efficiency degassing system based on internal circulation degassing in this embodiment includes an aerobic reactor 1 and an internal circulation degassing unit 2. The aerobic reactor 1 is provided with an inlet 5 and an outlet weir 6, and an aerator 4 is installed inside the aerobic reactor 1.

[0018] The internal circulation degassing unit 2 includes a degassing cylinder 7 and a gas collection hood 8 disposed above the degassing cylinder 7. A guide cylinder 9 is located at the center of the degassing cylinder 7, and the diameter of the degassing cylinder is approximately half the diameter of the reactor. The guide cylinder 9 is fixed to the inner wall of the degassing cylinder 7 by a support. The guide cylinder 9 is disposed inside the degassing cylinder 7. The guide cylinder 9 is open at both the top and bottom. The upper part of the guide cylinder 9 is the inlet, which is connected to the outlet weir 6 via a guide pipe 10. The lower part of the guide cylinder 9 is the outlet. Spiral guide vanes 11 are disposed inside the guide cylinder 9. Inclined baffles 12 are fixed to the inner wall of the degassing cylinder 7 on the outside of the guide cylinder 9. The baffles 12 are inclined upwards and fixed to the inner wall of the degassing cylinder 7 at a 45° angle. Multiple layers of baffles 12 are disposed vertically, each layer containing multiple baffles 12 arranged in an array along the axial direction of the degassing cylinder 7. As shown in Figures 2 and 3, the baffles 12 between adjacent upper and lower layers are arranged in an alternating manner in the vertical direction; the water outlet 13 located at the top of the degassing cylinder 7 is connected to the water inlet 5 through the circulation pump 3.

[0019] When treating wastewater using the system of this embodiment, the wastewater enters the aerobic reactor 1 for aerobic reaction. The mixed liquid in the reactor enters the degassing cylinder 7 through the guide pipe 10 and first undergoes gravity separation. The mixed liquid forms a vortex under the action of the spiral guide plate 11 and the baffle 12, which promotes the release of bubbles. The gas is finally collected and discharged by the gas collection hood 8 at the top. After degassing, the mixed liquid is returned to the reactor through the circulation pump 3.

[0020] This invention utilizes a combination of gravity separation and eddy current shearing for multi-mechanism synergistic degassing, effectively solving the problem of particle floating caused by bubble adhesion, air pockets, and floc entrainment. Furthermore, by using internal circulating hydraulic energy instead of mechanical stirring, energy consumption is significantly reduced. In tests using this system to treat municipal wastewater, aerobic granular sludge cultivation was completed within 15 days, achieving a degassing efficiency of 92%, a sludge settling velocity increase of 25%, and a COD removal rate consistently above 90%.

Claims

1. A high-efficiency degassing system for aerobic granular sludge based on internal circulation degassing, characterized in that, The aerobic reactor (1) includes an aerobic reactor (1) and an internal circulation degassing unit (2). The aerobic reactor (1) is provided with an inlet (5) and an outlet weir (6). An aerator (4) is installed inside the aerobic reactor (1). The internal circulation degassing unit (2) includes a degassing cylinder (7) and a gas collection hood (8) installed above the degassing cylinder (7). A guide cylinder (9) is installed inside the degassing cylinder (7). The guide cylinder (9) is open at the top and bottom. The upper part of the guide cylinder (9) is the inlet and is connected to the outlet weir (6) through a guide pipe (10). The lower part of the guide cylinder (9) is the outlet. A guide plate (11) is installed inside the guide cylinder (9). An inclined baffle (12) is fixed to the inner wall of the degassing cylinder (7) on the outside of the guide cylinder (9). The outlet located at the top of the degassing cylinder (7) is connected to the inlet (5) through a circulation pump (3).

2. The aerobic granular sludge high-efficiency degassing system according to claim 1, characterized in that, The guide tube (9) is located at the center of the degassing tube (7), and the guide tube (9) is fixed to the inner wall of the degassing tube (7) by a bracket.

3. The aerobic granular sludge high-efficiency degassing system according to claim 1, characterized in that, The guide vane (11) has a spiral structure.

4. The aerobic granular sludge high-efficiency degassing system according to claim 1, characterized in that, The baffle (12) is fixed to the inner wall of the degassing cylinder (7) at an inclined upward angle and forms a preset inclined angle with the inner wall of the degassing cylinder (7).

5. The aerobic granular sludge high-efficiency degassing system according to claim 1 or 4, characterized in that, The baffle (12) is provided with multiple layers in the vertical direction, and each layer contains multiple baffles (12) arranged in an array along the axial direction of the degassing cylinder (7).

6. The aerobic granular sludge high-efficiency degassing system according to claim 5, characterized in that, The baffles (12) between adjacent upper and lower layers are arranged in an alternating manner in the vertical direction.

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