Anaerobic ammonia oxidation strain interception device
By installing a microbial retention device with inclined plate attachment components inside the anaerobic ammonia oxidation tank, the problems of high cost and incomplete microbial retention in the existing technology are solved, achieving low-cost and efficient microbial recovery and wastewater treatment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHONGQING ENVIRONMENT & SANITATION GRP CO LTD
- Filing Date
- 2026-03-27
- Publication Date
- 2026-05-01
AI Technical Summary
Existing microbial interceptors are costly to use and do not completely separate and retain microorganisms, resulting in significant loss of anaerobic ammonia-oxidizing bacteria and affecting wastewater treatment efficiency.
An anaerobic ammonia-oxidizing bacteria retention device is designed. The device uses an inclined plate attachment component to adsorb and precipitate bacteria inside the shell, and recovers the bacteria by gravity. The device combines multiple adsorption and the inclined plate angle design to increase the contact area and flow path, ensuring thorough retention of bacteria.
It achieves low-cost and efficient microbial retention, reduces microbial loss, and improves wastewater treatment efficiency.
Smart Images
Figure CN121948611A_ABST
Abstract
Description
An anaerobic ammonia-oxidizing bacteria retention device Technical Field
[0001] This invention relates to the field of wastewater treatment, and in particular to a device for retaining anaerobic ammonia-oxidizing bacteria. Background Technology
[0002] Anaerobic ammonia oxidation (AAO) is a novel autotrophic denitrification process in wastewater treatment, capable of denitrification without the need for an external carbon source. However, the growth time of AAO bacteria is as long as 11 days, and their growth rate is relatively low. When using an AAO tank to treat wastewater, the AAO bacteria inside convert ammonia nitrogen and nitrite nitrogen in the wastewater into nitrogen gas and water, achieving efficient denitrification. The denitrified wastewater is then discharged from the tank through a sludge discharge system. During this discharge process, some bacteria are lost along with the wastewater, severely impacting the system's wastewater treatment efficiency. Therefore, it is necessary to install a bacterial retention device inside the AAO tank to retain the bacteria mixed in the discharged wastewater, allowing for their reuse.
[0003] To address the aforementioned issues, Chinese Patent Publication No. 211026745 discloses a microbial inoculum trap, comprising an inoculum body. The inoculum body includes a tangential feed pipe, a cyclone pipe, and a tapered cylinder connected to the lower end of the cyclone pipe and tapering downwards. A material separation chamber is formed within the cyclone pipe and the tapered cylinder. A microbial inoculum outlet is located at the bottom of the tapered cylinder. The outlet end of the tangential feed pipe is tangentially positioned along the cyclone pipe. A sludge outlet is located at the top of the cyclone pipe, and the outlet end of the tangential feed pipe is located on the side wall of the cyclone pipe. The tangential feed pipe, the microbial inoculum outlet, and the sludge outlet are all connected to the material separation chamber. This microbial inoculum trap uses a pump to rapidly introduce sludge containing microorganisms into the tangential feed pipe. Utilizing the principle of centrifugal gravity separation, microorganisms with different densities are separated from the sludge, allowing most of the microorganisms to be used. However, this trap requires a large centrifugal force from the pump body to achieve this, which increases the cost of use. In addition, this method of separation by trapping bacteria has the problem of incomplete separation. Multiple traps need to be set up and interconnected to achieve complete separation, and there are also requirements for installation space. Summary of the Invention
[0004] To address the aforementioned shortcomings of existing technologies, the present invention aims to solve the problems of high operating costs and insufficient bacterial retention and separation in existing bacterial strain interceptors. It provides an anaerobic ammonia oxidation bacterial strain interception device that can adsorb and retain anaerobic bacteria in wastewater after it enters the wastewater. Once the anaerobic bacteria have accumulated to a certain thickness, they fall and are recovered under gravity. The device features a simple structure, a wide bacterial adhesion surface, and excellent bacterial retention and separation effects.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: an anaerobic ammonia oxidation bacteria interception device is installed inside an anaerobic ammonia oxidation tank and located at the upper end of the anaerobic ammonia oxidation tank. It includes a shell with an internal interception chamber, and a liquid inlet and bacteria return outlet are provided at the lower end of the shell. At least one bacteria attachment component is fixedly installed in the height direction of the interception chamber. The bacteria attachment component includes multiple spaced inclined plates. An outlet pipe communicating with the interception chamber is provided on the shell and above the bacteria attachment component. The interception device is fixedly installed at the upper end of the anammox tank (after installation, the lower end is immersed in the wastewater of the anammox tank). After denitrification, the wastewater mixed with bacteria enters the shell of the interception device through the inlet and bacteria return port at the lower end of the shell. As the bacteria particles in the wastewater flow past the inclined plates of the bacteria attachment component, the bacteria are continuously attached and precipitated on each inclined plate of the bacteria attachment component. This ensures that the wastewater flowing into the upper part of the shell is wastewater without bacteria or with only a very small amount of bacteria, and is finally discharged from the anammox tank through the outlet pipe. After long-term use, more and more bacteria are attached to the inclined plates, making the attached and precipitated bacteria heavier. Under the action of gravity, they will automatically detach and eventually fall back to the inlet and bacteria return port, falling back to the bottom of the tank, preventing the bacteria from being lost. Multiple bacteria attachment components are set inside the shell, arranged along the direction of wastewater overflow, so that the bacteria in the wastewater flowing into the shell can be adsorbed multiple times, resulting in more thorough bacteria interception. Meanwhile, each bacterial attachment component mainly consists of multiple spaced inclined plates. These inclined plates have a certain angle, which increases the contact area between the sewage and the inclined plates when the sewage flows to that point, and also facilitates extending the sewage flow length, allowing sufficient time for attachment and sedimentation on the inclined plates. In addition, the arrangement of the inclined plates also makes it easier for the bacterial strains to fall off quickly.
[0006] Furthermore, the bacterial attachment components are provided in two units, arranged vertically at intervals. The inclined plates of the upper and lower bacterial attachment components have opposite inclination directions. This vertical arrangement of the bacterial attachment components aligns with the wastewater discharge path, effectively ensuring that the wastewater has two opportunities for bacterial adsorption after entering the interception device, thus ensuring more thorough bacterial adsorption and sedimentation. The opposite inclination directions of the upper and lower bacterial attachment components further increase the wastewater flow, the contact area between the bacterial particles and the inclined plates, and extend the wastewater flow path.
[0007] Furthermore, the inclination angle of each inclined plate on the bacterial attachment component is 30-75° or 110-175°, and the left and / or right sides of each inclined plate are in close contact with or penetrate the corresponding sidewall of the shell, and are sealed to the sidewall. The inclination angle of the inclined plates is reasonable, which can not only increase the contact area of sewage, but also facilitate the falling of bacterial cultures after a certain period of sedimentation. The side ends of the inclined plates are in close contact with or adjacent to the inner wall of the shell, which can fully cover the flow space of sewage.
[0008] Furthermore, the upper or lower end of the microbial attachment component also includes multiple spaced-apart reinforcing plates. Each reinforcing plate has multiple slots spaced along its length that correspond one-to-one with the inclined plates. The upper or lower end of each inclined plate of the microbial attachment component is securely connected to the slots on the respective reinforcing plates. The reinforcing plates connect multiple inclined plates into a single unit, while simultaneously increasing the stability of each inclined plate.
[0009] Furthermore, a water guide channel is provided inside the shell and above the bacterial attachment component. Both ends of the water guide channel are fixedly connected to the inner wall of the shell, with one end corresponding to the outlet pipe. Multiple water passage holes are spaced apart on the side walls of both sides of the water guide channel. After the water guide channel is installed, the wastewater intercepted by the bacterial culture enters the water guide channel through the water passage holes, and is ultimately guided to the outlet pipe for discharge.
[0010] Furthermore, the water guide channel is U-shaped, and the end of the water guide channel near the outlet pipe has a slope. The slope of the section of the water guide channel near the outlet pipe facilitates the rapid guidance of sewage to the outlet pipe.
[0011] Furthermore, the middle of the water guide channel is connected to a channel reinforcement plate, which is arranged perpendicular to the length direction of the water guide channel. The channel reinforcement plate fixed to the water guide channel can effectively increase the strength of the water guide channel, making it more stable.
[0012] Furthermore, the shell is composed of an upper cylindrical body and a lower conical body. The inoculum attachment component is installed in the upper cylindrical body, and the diameter of the lower conical body gradually decreases from top to bottom, with the lower end forming the liquid inlet and inoculum return port. The shell is generally circular, so the water flow will not cause significant disturbance and the flow rate will be stable. The diameter component at the lower end of the shell narrows, giving the lower end a conical arc surface, which facilitates the guidance of the water flow direction. At the same time, when the inoculum falls under the influence of gravity, it can slide down the conical arc surface and exit through the liquid inlet and inoculum return port.
[0013] Furthermore, two mounting flanges are fixed at intervals on the outer side of the upper cylindrical body, and multiple reinforcing plates with their inner ends fixedly connected to the upper cylindrical body are fixed at intervals on each mounting flange. The mounting flanges facilitate the installation of the support device when the shell is suspended and fixed. At the same time, in specific implementation, the upper cylindrical body can be composed of multiple cylindrical sections fixedly connected by the mounting flanges, reducing the difficulty of shell manufacturing; while the reinforcing plates can increase the strength of the shell and the mounting flanges.
[0014] Furthermore, at least two suspension lugs are fixed at intervals at the upper end of the shell. The suspension lugs at the upper end can be used to attach the lifting hook when hoisting the inoculum trap. Attached Figure Description
[0015] To make the objectives, technical solutions, and advantages of the invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein:
[0016] Figure 1 is a three-dimensional structural schematic diagram of the anaerobic ammonia-oxidizing bacteria retention device in the embodiment;
[0017] Figure 2 is a top view of the anaerobic ammonia-oxidizing bacteria retention device in the embodiment;
[0018] Figure 3 is a cross-sectional view of AA in Figure 2. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0021] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the terms "horizontal," "vertical," etc., do not indicate that the component is required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0022] Example: Referring to Figure 1, this example provides an anaerobic ammonia oxidation bacteria interception device, installed inside an anaerobic ammonia oxidation tank and located at the upper end of the tank. It includes a shell 1 with an internal interception chamber. A liquid inlet and bacteria return port 11 is provided at the lower end of the shell 1. Two bacteria attachment components 2 are fixedly installed at vertical intervals along the height of the interception chamber. Each bacteria attachment component 2 includes multiple spaced inclined plates 21 (each inclined plate 21 has the same size and installation height). A water guide trough 3, communicating with the interception chamber, is provided on the shell 1 above the bacteria attachment components 2. Both ends of the water guide trough 3 are fixedly connected to corresponding sides of the shell 1. A water outlet pipe 4, corresponding to the water outlet pipe, is provided at one end of the water guide trough 3. The water outlet pipe 4 extends outside the shell 1 and is fixedly connected to a flange, allowing wastewater to be piped outside the anaerobic ammonia oxidation tank. The interception device is fixedly installed at the upper end of the anaerobic ammonia oxidation tank (where the content of sludge and bacteria is relatively low). After denitrification, the wastewater mixed with bacteria enters the shell 1 through the inlet and bacteria return port 11 at the lower end of the interception device shell 1. As it passes through the inclined plates 21 of each bacteria attachment component 2, the bacteria continuously attach and settle onto the inclined plates 21, ensuring that the wastewater flowing into the upper part of the shell 1 contains no bacteria or only a very small amount of bacteria. Finally, it is discharged from the anaerobic ammonia oxidation tank through the outlet pipe 4. After prolonged use, more and more bacteria attach to the inclined plates 21, making the attached and settled bacteria heavier. Under the action of gravity, they automatically detach and eventually fall back to the inlet and bacteria return port 11, falling back to the bottom of the tank, preventing the bacteria from being lost. Multiple bacterial attachment components 2 are installed inside the shell 1 and are arranged along the direction of sewage overflow, enabling multiple adsorptions of bacteria in the sewage flowing into the shell 1, resulting in more thorough bacterial retention. Simultaneously, each bacterial attachment component 2 mainly consists of multiple spaced inclined plates 21. These inclined plates 21 have a certain angle, which increases the contact area between the sewage and the inclined plates 21 when the sewage flows to them, and also extends the sewage flow length, allowing sufficient time for attachment and sedimentation on the inclined plates 21. Furthermore, the arrangement of the inclined plates 21 facilitates the rapid falling off of the bacteria.
[0023] As shown in Figure 2, in this embodiment, the inclined plates 21 of the two bacterial attachment components 2 have opposite inclination directions. The inclined plate 21 at the lower end has an inclination angle of 60°, and the inclined plate 21 at the upper end has an inclination angle of 120°. Both sides of each inclined plate 21 are tightly attached to or extend through the corresponding side wall of the housing 1, and are sealed to the corresponding side wall of the housing with adhesive (specifically, the housing has multiple inclined holes for inserting the inclined plates). The bacterial attachment components 2 are arranged vertically, following the same wastewater discharge path, effectively ensuring that the wastewater has two opportunities for bacterial adsorption after entering the interception device, thus ensuring more thorough bacterial adsorption and sedimentation. With each inclined plate 21 tightly attached to the side wall of the housing 1, and the inclined plates 21 of the upper and lower bacterial attachment components 2 arranged with opposite inclination directions, the wastewater flows in an S-shaped path, further increasing the water flow and the contact area between the bacterial particles and the inclined plates 21, and extending the wastewater flow path.
[0024] In practice, three or more microbial attachment components 2 can be provided, but this will increase the length of the shell 1. Alternatively, the microbial adsorption area can be increased by increasing the diameter of the shell 1 and increasing the number of inclined plates 21 in each microbial attachment component 2.
[0025] In this embodiment, both the inclined plate 21 and the shell 1 are made of PP material, which has stable chemical properties and can provide a substrate for bacterial adhesion. In specific applications, the inclined plate 21 has a certain degree of roughness to facilitate bacterial adhesion, and after a certain number of bacteria have adhered, they can detach from the inclined plate 21.
[0026] As shown in Figures 2 and 3, at the lower end of the lower inoculum attachment component 2 and at the upper end of the upper inoculum attachment component 2, multiple reinforcing plates 22 are spaced apart, connecting to all the inclined plates 21 on the inoculum attachment component 2. Specifically, each reinforcing plate 22 has multiple slots spaced apart along its length, corresponding one-to-one with the inclined plates 21. The upper or lower ends of each inclined plate 21 of the inoculum attachment component 2 are locked and fixedly connected to the slots on the respective reinforcing plates 22. The reinforcing plates 22 can connect multiple inclined plates 21 into a whole, while increasing the stability of each inclined plate 21.
[0027] As shown in Figure 1, the water guiding channel 3 is U-shaped, with multiple water passage holes 31 spaced apart on both sides of the sidewalls. The end of the water guiding channel 3 near the outlet pipe 4 has a slope. A reinforcing plate connects to the middle of the water guiding channel 3, and the reinforcing plate is perpendicular to the length of the water guiding channel 3. The slope of the section of the water guiding channel 3 near the outlet pipe 4 facilitates the rapid guidance of wastewater to the outlet pipe 4. The reinforcing plate fixed to the water guiding channel 3 effectively increases its strength, making it more stable.
[0028] Furthermore, the shell 1 is composed of an upper cylindrical body and a lower conical body. The inoculum attachment component is installed in the upper cylindrical body, and the diameter of the lower conical body gradually decreases from top to bottom, with the lower end forming the liquid inlet and inoculum return port. The shell 1 is generally circular, so the water flow will not cause significant disturbance and the flow rate will be stable. The diameter component at the lower end of the shell 1 narrows, giving the lower end a conical arc surface, which facilitates the guidance of the water flow direction. At the same time, when the inoculum falls under the action of gravity, it can slide down the conical arc surface and exit through the liquid inlet and inoculum return port 11.
[0029] Furthermore, two mounting flanges 12 are fixed at intervals on the outer side of the upper cylindrical body, and multiple reinforcing plates 13 fixed at intervals on each mounting flange 12 and fixedly connected to the upper cylindrical body. The mounting flanges facilitate the installation of the support device when the shell is suspended and fixed, and increase the strength of the upper cylindrical body, while the reinforcing plates increase the strength of the shell.
[0030] Four suspension lugs 14 are fixed circumferentially on the shell 1, and the suspension lugs 14 are evenly distributed, providing four lifting points during lifting. The suspension lugs 14 provided at the upper end can be used to attach the lifting hook when lifting the inoculum trap.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.
Claims
1. An anaerobic ammonia oxidation bacteria retention device, installed inside an anaerobic ammonia oxidation tank and located at the upper end of the tank, comprising a shell with an internal retention chamber, characterized in that, A liquid inlet and a bacterial culture return port are provided at the lower end of the shell. At least one bacterial culture attachment component is fixedly installed in the height direction of the interception chamber. The bacterial culture attachment component includes multiple spaced inclined plates. A water outlet pipe connected to the interception chamber is provided on the shell above the bacterial culture attachment component.
2. The anaerobic ammonia-oxidizing bacteria retention device according to claim 1, characterized in that, The microbial attachment component is provided in two parts, which are arranged at an interval between the upper and lower parts. The inclined plates of the microbial attachment component at the upper end and the inclined plates of the microbial attachment component at the lower end are inclined in opposite directions.
3. The anaerobic ammonia-oxidizing bacteria retention device according to claim 1 or 2, characterized in that, The inclination angle of each inclined plate on the strain attachment component is 30-75° or 110-175°, and the left and / or right sides of each inclined plate are closely attached to or penetrate the corresponding side wall of the shell and are sealed to the side wall.
4. The anaerobic ammonia-oxidizing bacteria retention device according to claim 3, characterized in that, The upper or lower end of the microbial attachment component also includes multiple spaced reinforcing plates. Each reinforcing plate has multiple slots that correspond one-to-one with the inclined plates along its length. The upper or lower end of each inclined plate of the microbial attachment component is locked and fixedly connected to the slots on each reinforcing plate.
5. An anaerobic ammonia-oxidizing bacteria retention device according to claim 1, 2, or 4, characterized in that, Inside the shell and above the bacterial attachment component, there is a water guide channel. The two ends of the water guide channel are fixedly connected to the inner wall of the shell, and one end is corresponding to the water outlet pipe. Multiple water passage holes are provided at intervals on the side walls on both the left and right sides of the water guide channel.
6. The anaerobic ammonia-oxidizing bacteria retention device according to claim 5, characterized in that, The water guide channel is U-shaped, and the end of the water guide channel near the water outlet pipe has a slope.
7. The anaerobic ammonia-oxidizing bacteria retention device according to claim 6, characterized in that, The middle part of the water guide channel is connected to a channel body reinforcing plate, and the channel body reinforcing plate is set perpendicular to the length direction of the water guide channel.
8. An anaerobic ammonia-oxidizing bacteria retention device according to claim 1, 2, 4, or 7, characterized in that, The shell consists of an upper cylindrical body and a lower conical body. The microbial attachment component is installed in the upper cylindrical body. The diameter of the lower conical body gradually decreases from top to bottom, and the lower end forms the liquid inlet and microbial return outlet.
9. The anaerobic ammonia-oxidizing bacteria retention device according to claim 8, characterized in that, Two mounting flanges are fixed at intervals on the outer side of the upper cylindrical body, and multiple reinforcing plates with their inner ends fixedly connected to the upper cylindrical body are fixed at intervals on each mounting flange.
10. The anaerobic ammonia-oxidizing bacteria retention device according to claim 9, characterized in that, At least two suspension lugs are fixed at intervals at the upper end of the housing.