Anaerobic sludge reflux device
By designing effluent recirculation and internal recirculation devices as well as a sludge recirculation system, the problems of uneven recirculation and sludge loss in the anaerobic reactor were solved, enabling the sustainable use of sludge and efficient operation of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING HUIDA ENVIRONMENTAL PROTECTION TECH CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-12
AI Technical Summary
Existing anaerobic reactors suffer from uneven reflux, easy clogging, and sludge loss problems, which affect treatment efficiency and cost.
An anaerobic sludge return system was designed, which includes an effluent return device, an internal return device, and a sludge return device. The effluent return pump and the internal return pump pressurize and lift the wastewater, and the sludge dewatering device performs dry and wet separation. The sludge is diluted in the anaerobic sludge thickening tank and then returned to the reactor.
This enables the sustainable use of sludge, prevents loss, improves the flexibility of reflux and the practicality of the device, enhances the reactor's treatment efficiency, and reduces operating costs.
Smart Images
Figure CN224226815U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment technology, specifically to an anaerobic sludge recirculation device. Background Technology
[0002] Most wastewater discharged from industries such as food, biology, and chemicals is high-concentration organic wastewater. Conventional physicochemical and biochemical treatments are difficult to achieve the desired results and also present a series of problems such as high investment, difficult operation and management, and high operating costs. With the continuous advancement of scientific research, anaerobic digestion, as a low-energy wastewater treatment technology, is playing an increasingly important role in the field of wastewater treatment.
[0003] The key to anaerobic reactor design is creating uniform and stable hydraulic conditions within the tank. The upward flow of the mixed liquor and the intense disturbance from biogas cause the sludge to expand and fluidize, enhancing the sludge-water surface contact and thus maintaining high sludge activity. To better control the upward flow velocity of the sludge-water mixture in the anaerobic reactor and maintain high anaerobic bacterial activity, a reflux device is generally required. However, existing technologies still have shortcomings.
[0004] (1) In the prior art, the commonly used reflux device for reactors is to reflux through a single pipe. Since the outlet is located in the upper part of the device, there are problems such as uneven reflux and easy blockage, which greatly affects the treatment efficiency of the reactor.
[0005] (2) When the sludge inside the reactor of the existing technology accumulates, the periodic discharge leads to the loss of organic matter and anaerobic fermentation bacteria in the anaerobic system. At the same time, it is easy to reduce the activity of anaerobic sludge, which not only affects the continuous operation of anaerobic sludge, but also results in high costs for off-site landfill.
[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content
[0007] The technical problem to be solved by this utility model is to overcome the above-mentioned defects and provide an anaerobic sludge return device.
[0008] To solve the above-mentioned technical problems, the technical solution provided by this utility model is: an anaerobic sludge recirculation device, comprising:
[0009] An upflow anaerobic reactor, wherein a three-phase separator is provided at the upper end of the interior of the upflow anaerobic reactor;
[0010] An outlet pipe is connected to the upper end of one side of the upflow anaerobic reactor, and an inlet pipe is connected to the lower end of one side of the upflow anaerobic reactor.
[0011] An effluent reflux device is provided at one end of an upflow anaerobic reactor. The effluent reflux device includes an effluent reflux pipe, one end of which is connected to an effluent pipe, and the other end of which is connected to an effluent reflux pump. The output pipe of the effluent reflux pump is connected to an inlet pipe.
[0012] An internal reflux device is provided inside the upflow anaerobic reactor. The internal reflux device includes an internal reflux intake branch pipe and an internal reflux main pipe located below the three-phase separator. One end of the internal reflux main pipe extends out of the upflow anaerobic reactor and the other end is connected to an internal reflux pump.
[0013] A sludge return device is provided at the other end of an upflow anaerobic reactor. The sludge return device includes a sludge discharge main pipe located at the bottom of the upflow anaerobic reactor. One end of the sludge discharge main pipe extends out of the upflow anaerobic reactor and is connected to a sludge dewatering device. One end of the sludge dewatering device is equipped with an anaerobic sludge thickening tank. The bottom of the anaerobic sludge thickening tank is connected to a sludge return pipe. One end of the sludge return pipe is connected to the middle of one end of the upflow anaerobic reactor. The output pipe of the internal return pump is connected to the sludge discharge main pipe.
[0014] Furthermore, the output pipe is equipped with an outlet water return flow meter.
[0015] Furthermore, the internal reflux suction branch pipe is connected to the internal reflux main pipe, the internal reflux pump output pipe is equipped with an internal reflux flow meter, and valves are installed on both the internal reflux pump output pipe and the sludge discharge main pipe.
[0016] Furthermore, the main sludge discharge pipe is connected to a branch sludge discharge pipe, the bottom of the sludge dewatering device is connected to a sewage discharge pipe, the sludge dewatering device is connected to the anaerobic sludge thickening tank by a dry sludge conveying pipe, a screw pump is installed on the dry sludge conveying pipe, and a screw pump is installed on the sludge return pipe.
[0017] The advantages of this utility model compared with the prior art are as follows:
[0018] (1) In this utility model, by setting up an effluent reflux device and an internal reflux device, the effluent and internal mixed liquid of the upflow anaerobic reactor are refluxed respectively. The reflux method is flexible and improves the shortcomings of previous reflux devices.
[0019] (2) In this utility model, by setting up a sludge return device, excess sludge is transported to the sludge dewatering device through the sludge discharge main pipe. The sludge is separated into dry and wet parts in the sludge dewatering device. The separated wastewater is discharged through the sewage discharge pipe, and the separated dry sludge enters the anaerobic sludge thickening tank through the dry sludge conveying pipe. After being diluted with water in the anaerobic sludge thickening tank, it is returned to the upflow anaerobic reactor through the sludge return pipe to ensure the sustainable use of anaerobic bacteria in the device and avoid loss, thereby improving the practicality of the device. Attached Figure Description
[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0021] Figure 1 This utility model relates to a three-dimensional anaerobic sludge recirculation device. Figure 1 .
[0022] Figure 2 This utility model relates to a three-dimensional anaerobic sludge recirculation device. Figure 2 .
[0023] Figure 3 This utility model relates to a three-dimensional anaerobic sludge recirculation device. Figure 3 .
[0024] Figure 4 This is a front sectional view of an anaerobic sludge recirculation device according to this utility model.
[0025] Figure 5 This is a top sectional view of an anaerobic sludge recirculation device according to this utility model. Figure 1 .
[0026] Figure 6 This is a top sectional view of an anaerobic sludge recirculation device according to this utility model. Figure 2 .
[0027] The diagram shows: 1. Upflow anaerobic reactor; 2. Three-phase separator; 3. Effluent pipe; 301. Inlet pipe; 4. Effluent reflux device; 401. Effluent reflux pipe; 402. Effluent reflux pump; 403. Effluent reflux flow meter; 5. Internal reflux device; 501. Internal reflux suction branch pipe; 502. Internal reflux main pipe; 503. Internal reflux pump; 504. Internal reflux flow meter; 6. Sludge reflux device; 601. Sludge discharge branch pipe; 602. Sludge discharge main pipe; 603. Sludge dewatering device; 604. Anaerobic sludge thickening tank; 605. Screw pump one; 606. Sludge reflux pipe; 607. Screw pump two; 608. Sewage pipe. Detailed Implementation
[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses consistent with some aspects of this disclosure as detailed in the appended claims.
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0030] like Figures 1 to 6 As shown, this embodiment proposes an anaerobic sludge return device, including an upflow anaerobic reactor 1. The upper end of the upflow anaerobic reactor 1 is equipped with a three-phase separator 2. An outlet pipe 3 is connected to the upper end of one side of the upflow anaerobic reactor 1, and an inlet pipe 301 is connected to the lower end of one side of the upflow anaerobic reactor 1. All of the above are existing technologies and will not be described in detail here.
[0031] The upflow anaerobic reactor 1 is equipped with an effluent reflux device 4 at one end. The effluent reflux device 4 includes an effluent reflux pipe 401. The diameter of the effluent reflux pipe 401 is determined according to the effluent reflux flow rate. The flow velocity in the pipe is preferably 0.6-1.5 m / s. One end of the effluent reflux pipe 401 is connected to the effluent pipe 3. Both the effluent reflux pipe and the effluent pipe are equipped with manual or automatic valves to facilitate the adjustment of the effluent reflux flow rate.
[0032] The other end of the effluent return pipe 401 is connected to an effluent return pump 402. The output pipe of the effluent return pump 402 is connected to the inlet pipe 301. The effluent return pump 402 facilitates the pressurization and lifting of the sewage in the effluent return pipe 401. An effluent return flow meter 403 is installed on the output pipe. The flow rate of the effluent return pump 402 is preferably 50%-200% of the inlet water volume. Its flow rate is measured by the effluent return flow meter 403. The effluent return flow meter 403 is an electromagnetic flow meter. The above is the prior art and will not be described in detail here.
[0033] The upflow anaerobic reactor 1 is equipped with an internal reflux device 5. The internal reflux device 5 includes an internal reflux intake branch pipe 501 and an internal reflux main pipe 502 located below the three-phase separator 2. The distance between the internal reflux intake branch pipe 501, the internal reflux main pipe 502 and the three-phase separator is 300-1000mm. The internal reflux intake branch pipe 501 and the internal reflux main pipe 502 are connected. The internal reflux intake branch pipe 501 needs to be arranged in a branch shape according to the reactor area. The reflux wastewater is discharged from the reactor through the internal reflux main pipe 502.
[0034] One end of the internal reflux main pipe 502 extends out of the upflow anaerobic reactor 1 and is connected to an internal reflux pump 503. An internal reflux flow meter 504 is installed on the output pipe of the internal reflux pump 503. The internal reflux pump 503 pressurizes and lifts the sewage in the internal reflux pipe. The flow rate of the internal reflux pump 503 is preferably 100%-300% of the influent flow rate. The flow rate is measured by the internal reflux flow meter 504, which is an electromagnetic flow meter. The above is the prior art and will not be described in detail here.
[0035] The other end of the upflow anaerobic reactor 1 is equipped with a sludge return device 6. The sludge return device 6 includes a sludge discharge main pipe 602 located at the bottom of the inside of the upflow anaerobic reactor 1. The sludge discharge main pipe 602 is connected to a sludge discharge branch pipe 601. The distance between the bottom of the pipe and the bottom of the tank is 200-500mm. The sludge discharge branch pipe 601 needs to be arranged in a branch pattern according to the area of the reactor.
[0036] The output pipe of the internal return pump 503 is connected to the sludge discharge main pipe 602. Both the output pipe of the internal return pump 503 and the sludge discharge main pipe 602 are equipped with valves. The internal return sewage can be easily returned to the bottom of the upflow anaerobic reactor 1 through the sludge discharge main pipe 602. The valves are manual or automatic valves to switch between internal return and sludge return.
[0037] One end of the sludge discharge main pipe 602 extends out of the upflow anaerobic reactor 1 and is connected to the end of the sludge dewatering device 603. The bottom of the sludge dewatering device 603 is connected to the sewage discharge pipe 608. The sludge dewatering device 603 is existing technology and will not be described in detail here. Excess sludge is transported into the sludge dewatering device 603 through the sludge discharge main pipe 602. The sludge undergoes dry-wet separation in the sludge return device 6, and the separated wastewater is discharged through the sewage discharge pipe 608.
[0038] The sludge dewatering device 603 is equipped with an anaerobic sludge thickening tank 604 at one end. The sludge dewatering device 603 and the anaerobic sludge thickening tank 604 are connected by a dry sludge conveying pipe. A screw pump 605 is installed on the dry sludge conveying pipe. By starting the screw pump 605, the dry sludge separated by the sludge dewatering device 603 enters the anaerobic sludge thickening tank 604 through the dry sludge conveying pipe. The above are all existing technologies and will not be described in detail here.
[0039] The bottom of the anaerobic sludge thickening tank 604 is connected to a sludge return pipe 606. One end of the sludge return pipe 606 is connected to the middle of one end of the upflow anaerobic reactor 1. A screw pump 607 is installed on the sludge return pipe 606. The anaerobic sludge thickening tank 604 is equipped with a stirring structure inside and a water injection pipe at the top. After dilution by adding water in the anaerobic sludge thickening tank 604, the sludge is returned to the upflow anaerobic reactor 1 through the sludge return pipe 606. All of the above are existing technologies and will not be described in detail here.
[0040] In practical implementation, this utility model uses an effluent return pump 402 to pressurize and lift the wastewater transported from the effluent pipe 3 to the effluent return pipe 401, and then returns the effluent to the bottom of the upflow anaerobic reactor 1 through the inlet pipe 301. An internal return pump 503 pressurizes and lifts the wastewater in the internal return pipe, and the returned wastewater is discharged from the reactor through the internal return main pipe 502. The internal return wastewater is then returned to the bottom of the upflow anaerobic reactor 1 through the sludge discharge main pipe 602. Excess sludge is then transported to the sludge dewatering device 603 through the sludge discharge main pipe 602. Dry and wet separation is performed in the sludge dewatering device 603. The separated wastewater is discharged through the sewage pipe 608, and the separated dry sludge enters the anaerobic sludge thickening tank 604 through the dry sludge conveying pipe. After being diluted with water in the anaerobic sludge thickening tank 604, it is returned to the upflow anaerobic reactor 1 through the sludge return pipe 606 to ensure the sustainable use of anaerobic bacteria in the device and avoid loss. At the same time, the effluent and internal mixed liquor of the upflow anaerobic reactor 1 can be returned separately. The return method is flexible, improves the shortcomings of previous return devices, and improves the practicality of the device.
[0041] All electrical components mentioned in this document are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device such as a computer. The specific embodiments disclosed herein omit detailed descriptions of known functions and components. To ensure device compatibility, the operating methods used are consistent with the parameters of commercially available devices. In addition, all contents not described in detail in this specification are prior art known to those skilled in the art. The accompanying drawings are structural schematic diagrams used to supplement the text of the specification.
[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An anaerobic sludge return device, characterized in that, include: An upflow anaerobic reactor (1) is provided with a three-phase separator (2) at the upper end of its interior. The outlet pipe (3) is connected to the upper end of one side of the upflow anaerobic reactor (1), and the lower end of one side of the upflow anaerobic reactor (1) is connected to the inlet pipe (301). The effluent return device (4) is located at one end of the upflow anaerobic reactor (1). The effluent return device (4) includes an effluent return pipe (401). One end of the effluent return pipe (401) is connected to the effluent pipe (3), and the other end of the effluent return pipe (401) is connected to an effluent return pump (402). The output pipe of the effluent return pump (402) is connected to the inlet pipe (301). An internal reflux device (5) is located inside the upflow anaerobic reactor (1). The internal reflux device (5) includes an internal reflux intake branch pipe (501) and an internal reflux main pipe (502) located below the three-phase separator (2). One end of the internal reflux main pipe (502) extends out of the upflow anaerobic reactor (1) and the end is connected to an internal reflux pump (503). A sludge return device (6) is provided at the other end of the upflow anaerobic reactor (1). The sludge return device (6) includes a sludge discharge main pipe (602) located at the bottom of the inside of the upflow anaerobic reactor (1). One end of the sludge discharge main pipe (602) extends out of the upflow anaerobic reactor (1) and is connected to a sludge dewatering device (603). One end of the sludge dewatering device (603) is provided with an anaerobic sludge thickening tank (604). The bottom of the anaerobic sludge thickening tank (604) is connected to a sludge return pipe (606). One end of the sludge return pipe (606) is connected to the middle of one end of the upflow anaerobic reactor (1). The output pipe of the internal return pump (503) is connected to the sludge discharge main pipe (602).
2. The anaerobic sludge recirculation device according to claim 1, characterized in that: The output pipe is equipped with a water return flow meter (403).
3. The anaerobic sludge recirculation device according to claim 1, characterized in that: The internal reflux suction branch pipe (501) is connected to the internal reflux main pipe (502). The internal reflux pump (503) output pipe is equipped with an internal reflux flow meter (504). Valves are provided on both the internal reflux pump (503) output pipe and the sludge discharge main pipe (602).
4. The anaerobic sludge recirculation device according to claim 1, characterized in that: The sludge discharge main pipe (602) is connected to a sludge discharge branch pipe (601), the bottom of the sludge dewatering device (603) is connected to a sewage discharge pipe (608), the sludge dewatering device (603) is connected to the anaerobic sludge thickening tank (604) by a dry sludge conveying pipe, a screw pump one (605) is installed on the dry sludge conveying pipe, and a screw pump two (607) is installed on the sludge return pipe (606).