A multistage anaerobic expanded bed

Abstract

The utility model relates to sewage treatment technical field, concretely relates to a multistage anaerobic expanded bed, including anaerobic reactor main part, the anaerobic reactor main part is equipped with water inlet and water outlet, the anaerobic reactor main part is divided into several reaction cavities through the baffle, is equipped with baffle plate in each reaction cavity, the baffle is equipped with water pass hole, the anaerobic reactor main part below is equipped with the backflow pipe, the bottom of one reaction cavity is equipped with the water pump of intercommunication with backflow pipe, is equipped with the communicating pipe between backflow pipe and remaining reaction cavities, and the scheme establishes even hydraulic cycle through initiative backflow, avoids the problem that front end reaction cavity matrix is overloaded (microorganism activity is inhibited), rear end reaction cavity matrix is starved (microorganism efficiency is low), makes the matrix concentration, hydraulic condition of each reaction cavity tend to unity, significantly promotes the overall activity of anaerobic microorganism.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a multi-stage anaerobic expanded bed. Background Technology

[0002] Anaerobic expanded bed wastewater treatment is widely used in food processing, printing and dyeing, chemical industry, and domestic sewage due to its advantages such as high degradation efficiency of organic pollutants, low energy consumption, and low sludge production.

[0003] In practical operation, existing anaerobic expanded bed technologies often rely solely on water passages in the partitions to achieve water flow between chambers, without establishing an effective hydraulic circulation mechanism. This design results in slow and uneven water exchange between reaction chambers, with significant differences in substrate concentration and hydraulic conditions within each chamber. This makes it impossible to form a uniform and stable anaerobic reaction environment. For example, the front-end reaction chamber may experience microbial overload due to excessively high substrate concentration, while the rear-end reaction chamber may suffer from microbial starvation due to excessively low substrate concentration. This severely affects the activity of anaerobic microorganisms and consequently reduces the overall treatment stability. Therefore, improvements are necessary. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-stage anaerobic expanded bed to solve the above problems.

[0005] The purpose of this utility model is achieved as follows: a multi-stage anaerobic expanded bed includes an anaerobic reactor body, which is provided with an inlet and an outlet. The anaerobic reactor body is divided into several reaction chambers by partitions, and each reaction chamber is provided with a baffle plate. The partitions are provided with water passage holes. A return pipe is provided at the bottom of the anaerobic reactor body. A water pump connected to the return pipe is provided at the bottom of one of the reaction chambers. A connecting pipe is provided between the return pipe and the other reaction chambers.

[0006] Preferably, the connecting pipe is equipped with an electric valve.

[0007] Preferably, a water distributor is provided at the bottom of the reaction chamber. The water distributor includes an annular pipe that communicates with the upper end of the connecting pipe. Several water outlet pipes are distributed in a circumferential array on the annular pipe, and the water outlet pipes are inclined.

[0008] Preferably, the anaerobic reactor body is provided with a top cover at the upper end, and the top cover is provided with a number of manholes, each manhole being located above each reaction chamber.

[0009] Preferably, the water inlet, water passage, and water outlet are all located at the same horizontal height.

[0010] This utility model has the following beneficial effects: 1. In this multi-stage anaerobic expanded bed, wastewater first enters the first reaction chamber through the inlet. Guided by baffles, it flows slowly, comes into contact with anaerobic microorganisms in the chamber, and undergoes initial degradation. Some wastewater flows naturally into subsequent reaction chambers through the water passages on the baffles, achieving multi-stage progressive degradation. At the same time, the water pump is started to pump water from the chamber with lower substrate concentration at the rear end into the return pipe. Then, the return water is distributed to the chambers with higher substrate concentration at the front and middle ends through the connecting pipe. Finally, the wastewater that has undergone multi-stage degradation and circulation regulation is discharged through the outlet. This scheme establishes a uniform hydraulic circulation through active return, avoiding the problems of substrate overload in the front reaction chamber (inhibition of microbial activity) and substrate starvation in the rear reaction chamber (low microbial efficiency). This makes the substrate concentration and hydraulic conditions of each reaction chamber tend to be uniform, significantly improving the overall activity of anaerobic microorganisms.

[0011] 2. The connecting pipes are equipped with electric valves. By adjusting the on / off state or opening degree of the electric valves, the return flow of each connecting pipe can be precisely controlled. For example, if the matrix concentration in a certain reaction chamber is too high (such as the front chamber), the electric valve of the corresponding connecting pipe can be opened wider to increase the return water flow to dilute the matrix. If the matrix concentration in a certain reaction chamber is too low (such as the rear chamber), the corresponding electric valve can be closed or closed to reduce the return water flow to retain the matrix.

[0012] 3. A water distributor is installed at the bottom of the reaction chamber. Through the porous design or flow channel of the water distributor, the water flow is evenly distributed to the entire bottom area of ​​the reaction chamber. When the evenly distributed water flows upward, it can fully contact the anaerobic microorganisms in the reaction chamber, avoiding local water flow concentration or dead corners. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the existing technology; Figure 2 This is a schematic diagram of the overall structure of this utility model; Figure 3 This is a schematic diagram of the overall structure of the water distributor of this utility model; The labels in the attached diagram are: 1. Anaerobic reactor body; 2. Inlet; 3. Outlet; 4. Baffle; 5. Reaction chamber; 6. Baffle plate; 7. Water passage hole; 8. Return pipe; 9. Water pump; 10. Electric valve; 11. Water distributor; 111. Circular pipe; 112. Outlet pipe; 12. Top cover; 13. Manhole; 14. Connecting pipe. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the technical solutions in the specific embodiments of this utility model are clearly and completely described below to further illustrate this utility model. Obviously, the specific embodiments described are only a part of the embodiments of this utility model, and not all of them.

[0016] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0017] Example 1: A multi-stage anaerobic expanded bed includes an anaerobic reactor body 1, which has an inlet 2 and an outlet 3. The anaerobic reactor body 1 is divided into several reaction chambers 5 by a partition 4. Each reaction chamber 5 is provided with a baffle 6. The partition 4 is provided with water passage holes 7. A return pipe 8 is provided below the anaerobic reactor body 1. A water pump 9 connected to the return pipe 8 is provided at the bottom of one of the reaction chambers 5. A connecting pipe 14 is provided between the return pipe 8 and the other reaction chambers 5.

[0018] In operation, wastewater first enters the first reaction chamber 5 through inlet 2 and flows slowly under the guidance of baffle 6, contacting the anaerobic microorganisms in the chamber and undergoing initial degradation. Some wastewater flows naturally into the subsequent reaction chamber 5 through the water passage 7 on the baffle 4, achieving multi-stage progressive degradation. At the same time, the water pump 9 is started to pump water from the chamber with lower substrate concentration at the rear end into the return pipe 8, and then distributes the return water to the chambers with higher substrate concentration at the front and middle ends through the connecting pipe 14. Finally, the wastewater that has undergone multi-stage degradation and circulation regulation is discharged through outlet 3. This scheme establishes a uniform hydraulic circulation through active return, avoiding the problems of substrate overload (microbial activity inhibition) in the front reaction chamber 5 and substrate starvation (low microbial efficiency) in the rear reaction chamber 5, so that the substrate concentration and hydraulic conditions of each reaction chamber 5 tend to be uniform, significantly improving the overall activity of anaerobic microorganisms.

[0019] In this embodiment, an electric valve 10 is provided on the connecting pipe 14. The reflux flow of each connecting pipe 14 can be precisely controlled by adjusting the on / off state or opening degree of the electric valve 10. For example, if the matrix concentration in a certain reaction chamber 5 is too high (such as the front chamber), the electric valve 10 of the corresponding connecting pipe 14 can be opened to increase the reflux water flow to dilute the matrix. If the matrix concentration in a certain reaction chamber 5 is too low (such as the rear chamber), the corresponding electric valve 10 can be closed to reduce the reflux water flow to retain the matrix.

[0020] In this embodiment, a water distributor 11 is provided at the bottom of the reaction chamber 5. The water distributor 11 includes an annular pipe 111 connected to the upper end of the connecting pipe. Several water outlet pipes 112 are arranged in a circular array on the annular pipe 111. The water outlet pipes 112 are inclined. Through the water distributor 11, the water flow is evenly distributed to the entire bottom area of ​​the reaction chamber 5. When the evenly distributed water flow spirals upward, it can fully contact the anaerobic microorganisms in the reaction chamber 5, avoiding local water flow concentration or dead corners.

[0021] In this embodiment, the anaerobic reactor body 1 is provided with a top cover 12 at the upper end, and the top cover 12 is provided with a number of manholes 13. Each manhole 13 is correspondingly located above each reaction chamber 5. The top cover 12 seals the internal space of the reactor, preventing air from entering and preventing the leakage of volatile organic compounds such as methane. When it is necessary to inspect or observe the growth status of microorganisms in the chamber, the manhole 13 above the corresponding reaction chamber 5 can be opened, and the staff can directly operate on a single chamber without disassembling the entire reactor.

[0022] In this embodiment, the inlet 2, the water passage 7, and the outlet 3 are all located at the same horizontal level, reducing the water flow resistance caused by the height difference. The water level in each reaction chamber 5 is uniform, avoiding uneven matrix concentration and decreased microbial contact efficiency caused by water level fluctuations.

[0023] The working principle of this utility model is as follows: The multi-stage anaerobic expanded bed includes an anaerobic reactor body 1, which is provided with an inlet 2 and an outlet 3. The anaerobic reactor body 1 is divided into several reaction chambers 5 by a partition 4. Each reaction chamber 5 is provided with a baffle 6. The partition 4 is provided with water passage holes 7. A return pipe 8 is provided below the anaerobic reactor body 1. A water pump 9 connected to the return pipe 8 is provided at the bottom of one of the reaction chambers 5. A connecting pipe 14 is provided between the return pipe 8 and the other reaction chambers 5. In operation, wastewater first enters the first reaction chamber 5 through inlet 2 and flows slowly under the guidance of baffle 6, contacting the anaerobic microorganisms in the chamber and undergoing initial degradation. Some wastewater flows naturally into the subsequent reaction chamber 5 through the water passage 7 on the baffle 4, achieving multi-stage progressive degradation. At the same time, the water pump 9 is started to pump water from the chamber with lower substrate concentration at the rear end into the return pipe 8, and then distributes the return water to the chambers with higher substrate concentration at the front and middle ends through the connecting pipe 14. Finally, the wastewater that has undergone multi-stage degradation and circulation regulation is discharged through outlet 3. This scheme establishes a uniform hydraulic circulation through active return, avoiding the problems of substrate overload (microbial activity inhibition) in the front reaction chamber 5 and substrate starvation (low microbial efficiency) in the rear reaction chamber 5, so that the substrate concentration and hydraulic conditions of each reaction chamber 5 tend to be uniform, significantly improving the overall activity of anaerobic microorganisms.

[0024] It should be noted that, depending on the implementation needs, the various components described in the embodiments of this utility model can be divided into more components, or two or more components or parts of components can be combined into new components to achieve the purpose of the embodiments of this utility model. The above embodiments only illustrate several implementation methods 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 pointed out that, for those skilled in the art, several modifications and improvements can be made 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 anaerobic expanded bed, comprising an anaerobic reactor body (1), wherein the anaerobic reactor body (1) is provided with an inlet (2) and an outlet (3), the anaerobic reactor body (1) is divided into several reaction chambers (5) by partitions (4), each reaction chamber (5) is provided with a baffle plate (6), and the partitions (4) are provided with water passage holes (7), characterized in that: The anaerobic reactor body (1) is provided with a reflux pipe (8) below it, and a water pump (9) connected to the reflux pipe (8) is provided at the bottom of one of the reaction chambers (5). A connecting pipe (14) is provided between the reflux pipe (8) and the other reaction chambers (5).

2. The multi-stage anaerobic expanded bed according to claim 1, characterized in that: An electric valve (10) is provided on the connecting pipe (14).

3. The multi-stage anaerobic expanded bed according to claim 1, characterized in that: The bottom of the reaction chamber (5) is provided with a water distributor (11). The water distributor (11) includes an annular pipe (111) that is connected to the upper end of the connecting pipe (14). Several water outlet pipes (112) are arranged in a circular array on the annular pipe (111). The water outlet pipes (112) are inclined.

4. The multi-stage anaerobic expanded bed according to claim 1, characterized in that: The anaerobic reactor body (1) is provided with a top cover (12) at the upper end, and the top cover (12) is provided with several manholes (13), each manhole (13) being located above each reaction chamber (5).

5. A multi-stage anaerobic expanded bed according to claim 1, characterized in that: The inlet (2), the water passage (7), and the outlet (3) are all located at the same horizontal level.

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