Cyclone inoculum metering mixer applied to AGS technology

Abstract

This invention provides a cyclone-type inoculum quantitative mixer for AGS technology, relating to the field of wastewater treatment. It includes a mixing chamber, a throat, and a diffuser chamber. The mixing chamber is cylindrical with a funnel-shaped bottom. The funnel-shaped bottom of the mixing chamber connects to the inlet of the throat. The outlet of the throat connects to the diffuser chamber. An outlet is located at the bottom of the diffuser chamber. The throat gradually narrows from the inlet to the outlet. The diffuser chamber is a frustum-shaped chamber, smaller at the top and larger at the bottom. The throat connects to the bottom surface of the frustum of the diffuser chamber. Multiple inlet pipes are provided on the sidewalls of the mixing chamber. The outlets of the inlet pipes are located along the cylindrical tangent of the chamber. All inlet pipes rotate in the same direction. This cyclone-type inoculum quantitative mixer for AGS technology solves the problems of uneven inoculum mixing and long particle formation time in existing technologies, thus extending the wastewater treatment cycle, and allows for uniform inoculum dispersion.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment, and in particular to a cyclone inoculum metering mixer applied to AGS technology. Background Technology

[0002] During the start-up of aerobic granular sludge (AGS), the uniform dispersion and mixing of the inoculum is a key factor in determining the granulation efficiency.

[0003] Currently, traditional processes commonly involve manually adding inoculum such as paddy field soil and flocculent sludge. However, when manually dumping or adding in batches, it is difficult for paddy field soil particles and flocculent sludge to fully contact the wastewater, leading to an imbalance in the distribution of the microbial community and affecting the granulation process. If clay minerals in the paddy field soil accumulate locally, they can form a barrier that is difficult for microorganisms to penetrate, inhibiting metabolic activity. Low mixing efficiency and insufficient collision frequency required for microbial self-aggregation will prolong the granulation time.

[0004] Increasing aeration to enhance shear is a conventional method, but this significantly increases energy consumption.

[0005] Some existing technologies employ mechanical stirring or static mixers. For example, an AGS-SBR integrated wastewater treatment device disclosed in Chinese patent application number 202323084536.X uses an impeller to stir wastewater and inoculum by installing a stirrer in the equalization tank. However, this method is prone to causing excessive shear force, which can lead to particle breakage. This may affect the stability of the microbial community, destroy the outer layer of aerobic bacteria and the inner layer of anaerobic bacteria in the granular sludge, and expose functional microorganisms (such as polyphosphate-accumulating bacteria and denitrifying bacteria) to an unfavorable environment, thus affecting the nitrogen and phosphorus removal efficiency. Utility Model Content

[0006] To address the aforementioned technical problems, the present invention provides a vortex inoculum quantitative mixer for AGS technology, which allows the inoculum to be dispersed evenly.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] This utility model provides a cyclone inoculum quantitative mixer for AGS technology, comprising a mixing chamber, a throat, and a diffuser chamber. The mixing chamber is cylindrical, with a funnel-shaped bottom. The funnel-shaped bottom of the mixing chamber connects to the inlet of the throat. The outlet of the throat connects to the diffuser chamber. An outlet is provided at the bottom of the diffuser chamber. The throat gradually narrows from the inlet to the outlet. The diffuser chamber is a frustum-shaped chamber, smaller at the top and larger at the bottom. The throat connects to the bottom surface of the frustum of the diffuser chamber. Multiple inlet pipes are provided on the sidewall of the mixing chamber. The outlets of the inlet pipes are arranged along the cylindrical tangent of the mixing chamber. All the inlet pipes rotate in the same direction.

[0009] The cyclone inoculum quantitative mixer for AGS technology provided by this utility model preferably has spiral-shaped guide protrusions on the cylindrical inner wall and the funnel inner wall of the mixing chamber; the guide protrusions spiral downward; the outlet direction of the inlet pipe is arranged downward along the guide protrusions.

[0010] The cyclone inoculum metering mixer for AGS technology provided by this utility model preferably has an expansion angle of 8° to 15° in the diffuser chamber.

[0011] The swirl-type inoculum metering mixer for AGS technology provided by this utility model preferably has a smooth transition connection between the mixing chamber and the throat tube; and a smooth transition connection between the throat tube and the diffuser chamber.

[0012] The cyclone inoculum metering mixer for AGS technology provided by this utility model preferably has a perforated plate at the outlet.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] This invention provides a cyclone-type inoculum quantitative mixer for AGS technology, relating to the field of wastewater treatment. It includes a mixing chamber, a throat, and a diffuser chamber. The mixing chamber is cylindrical with a funnel-shaped bottom. The funnel-shaped bottom of the mixing chamber connects to the inlet of the throat. The outlet of the throat connects to the diffuser chamber. An outlet is located at the bottom of the diffuser chamber. The throat gradually narrows from the inlet to the outlet. The diffuser chamber is a frustum-shaped chamber, smaller at the top and larger at the bottom. The throat connects to the bottom surface of the frustum of the diffuser chamber. Multiple inlet pipes are provided on the sidewalls of the mixing chamber. The outlets of the inlet pipes are tangential to the cylinder of the mixing chamber. All inlet pipes rotate in the same direction. This cyclone-type inoculum quantitative mixer for AGS technology solves the problems of uneven inoculum mixing and long particle formation time in existing technologies, thus extending the wastewater treatment cycle, and allows for uniform inoculum dispersion. Attached Figure Description

[0015] The present invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings. The drawings are not intentionally drawn to scale; the focus is on illustrating the gist of the invention.

[0016] Figure 1 This is a schematic diagram of the overall structure of the cyclone inoculum quantitative mixer applied to AGS technology provided in Embodiment 1 of this utility model.

[0017] Figure 2 This is a schematic diagram of the outlet structure of the cyclone inoculum quantitative mixer applied to AGS technology provided in Embodiment 1 of this utility model. Detailed Implementation

[0018] Example 1:

[0019] The cyclone inoculum metering mixer applied to AGS technology provided in Embodiment 1 of this utility model, such as Figures 1 to 2 As shown, it includes a mixing chamber 1, a throat tube 2, and a diffuser chamber 3; the mixing chamber 1 is a cylindrical chamber; the bottom of the mixing chamber 1 is funnel-shaped; the funnel-shaped bottom of the mixing chamber 1 is connected to the inlet of the throat tube 2; the outlet of the throat tube 2 is connected to the diffuser chamber 3; an outlet 31 is opened at the bottom of the diffuser chamber 3; the throat tube 2 gradually narrows from the inlet to the outlet; the diffuser chamber 3 is a frustum-shaped chamber that is smaller at the top and larger at the bottom; the throat tube 2 is connected to the bottom surface of the frustum of the diffuser chamber 3; multiple inlet pipes 4 are provided on the side wall of the mixing chamber 1; the outlet of the inlet pipe 4 is set along the cylindrical tangent direction of the mixing chamber; all the inlet pipes 4 have the same spiral direction.

[0020] The cyclone inoculum quantitative mixer provided in Embodiment 1 of this utility model, applied to AGS technology, operates by mixing wastewater and inoculum (such as paddy soil, flocculent sludge, and an appropriate amount of water to form a slurry, which is driven by a slurry pump) from different inlet pipes 4 into the mixing chamber 1. The wastewater and inoculum flow tangentially along the mixing chamber 1, causing strong radial and axial turbulence in the converging liquids, promoting the mixing of inoculum and wastewater. The mixed liquid flows into the throat 2 through the funnel-shaped bottom, where it is accelerated due to the constriction design of the throat 2, and then enters the diffuser chamber 3. The diffuser chamber 3 reduces the fluid velocity and increases the pressure by expanding the cross-sectional area, further achieving uniform mixing through turbulent diffusion. Finally, the mixed wastewater flows into the AGS reaction tank from the outlet 31. Compared with the existing technology of manually adding inoculum directly to the AGS reactor, this embodiment uses turbulence to achieve mixing of wastewater and inoculum; compared with the existing mechanical impeller stirring method, this embodiment avoids excessive water flow shear force that could cause particle breakage and affect particle effect because the impeller does not shear particles (particles include treated paddy soil particles and some solid particle components in flocculent sludge).

[0021] The cyclone inoculum quantitative mixer provided in Embodiment 1 of this utility model, applied to AGS technology, solves the problems of uneven inoculum mixing and long particle forming time in the prior art, thereby prolonging the sewage treatment cycle, and can make the inoculum dispersed evenly.

[0022] As a preferred embodiment, in this embodiment, the cylindrical inner wall and the funnel inner wall of the mixing chamber 1 are provided with spiral-shaped flow-guiding protrusions 5; the flow-guiding protrusions 5 spiral downwards; the outlet direction of the inlet pipe 4 is arranged downwards along the flow-guiding protrusions 5. The spiral-shaped flow-guiding protrusions 5 guide the fluid to flow along a fixed spiral path, which can reduce energy dissipation during the swirling process, making the swirling more stable and stronger. Moreover, when the fluid flows along the spiral protrusions, the path is lengthened, increasing the collision frequency between the inoculum and the wastewater, and enhancing the shearing action required for self-coagulation.

[0023] In this embodiment, the expansion angle of the diffuser 3 is 8° to 15°. The expansion angle of the diffuser 3 determines the rate of fluid diffusion. When the expansion angle is between 8° and 15°, the fluid is less prone to boundary layer separation during diffusion, which can maintain a stable pressure rise and avoid energy loss caused by increased turbulence.

[0024] As a preferred embodiment, in this case, the mixing chamber 1 and the throat 2 are smoothly connected; the throat 2 and the diffuser chamber 3 are also smoothly connected. This smooth transition avoids right angles or sharp corners in the fluid channel, reducing turbulent resistance and pressure loss when the fluid flows through the connection point, allowing for smoother fluid flow and enabling energy to be used efficiently for mixing rather than overcoming resistance.

[0025] In this embodiment, a perforated plate is installed at the outlet 31. The perforated plate can disperse the water flow at the outlet into multiple smaller water streams, avoiding the strong water flow from a single outlet from impacting the granular sludge in the AGS reactor and preventing particle breakage due to excessive shear force of the water flow.

[0026] In summary, this utility model provides a cyclone-type inoculum quantitative mixer for AGS technology, relating to the field of wastewater treatment. It includes a mixing chamber, a throat, and a diffuser chamber. The mixing chamber is cylindrical with a funnel-shaped bottom. The funnel-shaped bottom of the mixing chamber connects to the inlet of the throat. The outlet of the throat connects to the diffuser chamber. An outlet is provided at the bottom of the diffuser chamber. The throat gradually narrows from the inlet to the outlet. The diffuser chamber is a frustum-shaped chamber, smaller at the top and larger at the bottom. The throat connects to the bottom surface of the frustum of the diffuser chamber. Multiple inlet pipes are provided on the sidewall of the mixing chamber. The outlets of the inlet pipes are arranged along the cylindrical tangent of the mixing chamber. All inlet pipes rotate in the same direction. This cyclone-type inoculum quantitative mixer for AGS technology solves the problems of uneven inoculum mixing and long particle formation time in existing technologies, thus extending the wastewater treatment cycle, and allows for uniform inoculum dispersion.

[0027] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A cyclone inoculum metering mixer applied to AGS technology, characterized in that, Includes a mixing chamber, a larynx, and a diffuser chamber; The mixing chamber is cylindrical; the bottom of the mixing chamber is funnel-shaped; the funnel-shaped bottom of the mixing chamber is connected to the inlet of the throat tube; the outlet of the throat tube is connected to the diffuser chamber; and an outlet is provided at the bottom of the diffuser chamber. The throat gradually narrows from the inlet to the outlet; The diffuser chamber is a frustum-shaped cavity that is smaller at the top and larger at the bottom; the throat tube is connected to the bottom surface of the frustum of the diffuser chamber; The mixing chamber has multiple inlet pipes on its sidewalls; the outlets of the inlet pipes are located along the cylindrical tangent of the mixing chamber; all the inlet pipes have the same spiral direction.

2. The cyclone inoculum metering mixer applied to AGS technology as described in claim 1, characterized in that, The cylindrical inner wall and the funnel inner wall of the mixing chamber are provided with spiral-shaped flow-guiding protrusions; the flow-guiding protrusions spiral downwards; the outlet direction of the inlet pipe is arranged downwards along the flow-guiding protrusions.

3. The cyclone inoculum metering mixer applied to AGS technology as described in claim 1, characterized in that, The expansion angle of the diffuser chamber is 8° to 15°.

4. The cyclone inoculum metering mixer applied to AGS technology as described in claim 1, characterized in that, The mixing cavity and the larynx are smoothly connected; The throat tube and the diffuser cavity are smoothly connected.

5. The cyclone inoculum metering mixer applied to AGS technology as described in claim 2, characterized in that, A perforated plate is installed at the outlet.

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