Membrane biological reaction device

Abstract

The utility model provides a membrane biological reaction device. The membrane biological reaction device comprises a reaction mechanism and a water production mechanism, the reaction mechanism comprises a reaction container and aeration equipment located at the bottom of the reaction container, and the aeration equipment is used for aerating wastewater in a local space in the reaction container, so that an aerobic region, an anoxic region and an anaerobic region are formed in the reaction container; the water producing mechanism comprises a water collecting assembly and a filtering membrane box, and the filtering membrane box is located at the top in the reaction container and connected with the water collecting assembly; the membrane biological reaction device further comprises a monitoring mechanism and a dosing mechanism which are connected with each other, the monitoring mechanism is used for monitoring specific parameters of water liquid of the water collecting assembly, and the dosing mechanism is used for adding corresponding medicaments into the reaction container based on the specific parameters. Through the application, the denitrification effect can be achieved in the single reaction container, the operation of the wastewater treatment system is simplified, a certain occupied area is saved, the wastewater treatment cost is reduced, and the wastewater treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a membrane bioreactor. Background Art

[0002] The denitrification process of traditional sewage treatment is mainly based on nitrification and denitrification, which has the disadvantages of long process flow, large land area, and high cost due to the need to add more carbon sources. Many experts and scholars at home and abroad have been committed to studying new denitrification technologies and methods, including short-range nitrification and denitrification, simultaneous nitrification and denitrification, anaerobic ammonia oxidation and autotrophic denitrification, in order to improve the denitrification efficiency of sewage and reduce the operating costs of sewage treatment plants.

[0003] At present, most of the comprehensive treatment devices of the disclosed membrane bioreactor technology adopt relatively standardized anaerobic tanks, aerobic tanks, membrane treatment tanks and other multi-stage independent structural devices to treat sewage, and the treated sewage is only treated in a single biochemical environment. It is precisely because of the above reasons that most of the disclosed membrane biochemical sewage treatment methods are multi-stage treatments, and the treatment devices involved are all independent and separated structures. Therefore, not only is the main equipment too large and the system complicated, but the manufacturing cost is also high, and the treatment efficiency has certain limitations, which is obviously not conducive to the widespread promotion and use of this technology. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide a membrane bioreactor to solve the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a membrane bioreactor, comprising a reaction mechanism and a water production mechanism;

[0006] The reaction mechanism includes a reaction container and an aeration device located at the bottom of the reaction container, wherein the aeration device is used to aerate the wastewater in a local space of the reaction container so as to form an aerobic region, an anoxic region and an anaerobic region in the reaction container;

[0007] The water production mechanism includes a water collection component and a filter membrane box, the filter membrane box is located at the top of the reaction container, the filter membrane box is connected to the water collection component, and the water collection component is used to discharge the water filtered by the filter membrane box;

[0008] Among them, the membrane bioreactor device also includes a connected monitoring mechanism and a dosing mechanism, the monitoring mechanism is used to monitor the specific parameters of the water discharged from the water collection component, the dosing mechanism is connected to the reaction container, and the dosing mechanism is used to add corresponding reagents into the reaction container based on the specific parameters.

[0009] The beneficial effects of the utility model are as follows: by arranging the aeration device at the bottom of the reaction container, the aeration device is used to aerate the wastewater in the local space of the reaction container, so that the wastewater above the aeration device forms a bottom-up flow state, and drives the wastewater in other spaces in the reaction container to flow from top to bottom, thereby forming a dissolved oxygen gradient in the reaction container, realizing the formation of aerobic areas, anoxic areas and anaerobic areas in the reaction container, providing favorable conditions for the growth of different microorganisms, and in this process, it is easy to produce partial short-range nitrification and denitrification, so that the demand for organic carbon sources of the device is reduced, thereby reducing the amount of carbon source added, and at the same time, the air output by the aeration device is discharged from the reaction container In the process of diffusing from the bottom of the reactor to the top, it fully contacts with the wastewater to improve the oxygen utilization rate. Then, the filter membrane box is set on the top of the reaction container, so that the wastewater in the reaction container can be filtered through the filter membrane box and then discharged through the water collection component to ensure that the microorganisms will not flow out with the overflowing water. In addition, through the coordinated use of the monitoring mechanism and the dosing mechanism, automatic addition of agents is realized without frequent manual operation. Different from the existing technology, it can achieve denitrification effect in a single reaction container, simplifying the operation of the wastewater treatment system, saving a certain amount of floor space, and also helping to reduce wastewater treatment costs and improve wastewater treatment efficiency.

[0010] Preferably, the reaction container is a cylindrical container, and the diameter-to-depth ratio of the reaction container is 1:5-1:8.

[0011] Preferably, the ratio of the aeration zone area of ​​the aeration equipment to the bottom area of ​​the reaction container is 1 / 8-1 / 2, and the filter membrane box includes a box body and a membrane assembly arranged in the box body, and the membrane assembly is used for cement separation of the wastewater.

[0012] Preferably, the membrane bioreactor further comprises a water inlet system, wherein the water inlet system is connected to the reaction container and is used to transport the wastewater into the reaction container.

[0013] Preferably, the water inlet system comprises a water inlet valve and a water inlet pump, the reaction container is provided with a liquid inlet, the liquid inlet is connected to the water inlet pump via a liquid inlet pipe, and the water inlet valve is installed on the liquid inlet pipe.

[0014] Preferably, the water collection assembly includes a water collection pipe and a water production pump, the water collection pipe is communicated with the filter membrane box, and the filter membrane box is connected to the water production pump through the water collection pipe.

[0015] Preferably, the membrane bioreactor further comprises a programmable logic controller, and the aeration device, the water inlet valve, the water inlet pump and the water production pump are all connected to the programmable logic controller.

[0016] Preferably, the membrane bioreactor further comprises a mud discharge assembly, the reaction container is provided with a mud discharge port, and the mud discharge port is connected to the mud discharge assembly.

[0017] Preferably, the monitoring mechanism includes a dissolved oxygen meter, a total nitrogen meter, an ammonia nitrogen monitor and a total phosphorus monitor, and the dissolved oxygen meter, the total nitrogen meter, the ammonia nitrogen monitor and the total phosphorus monitor are all connected to the programmable logic controller.

[0018] Preferably, the dosing mechanism comprises at least one dosing tank, a dosing pump and a dosing pipeline, the dosing pump is connected to the dosing pipeline, and the dosing tank is connected to the reaction container through the dosing pipeline.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a membrane bioreactor provided in an embodiment of the utility model;

[0021] Figure 2 A cross-sectional view of a membrane bioreactor provided in an embodiment of the utility model;

[0022] Figure 3 This is a structural block diagram of a membrane bioreactor provided in an embodiment of the utility model.

[0023] Description of main component symbols:

[0024] 10. Reaction vessel; 20. Aeration equipment; 30. Water collection assembly; 31. Water collection pipe; 32. Water production pump; 40. Filter membrane box; 50. Monitoring mechanism; 51. Dissolved oxygen meter; 52. Total nitrogen meter; 53. Ammonia nitrogen monitor; 54. Total phosphorus monitor; 60. Dosing mechanism; 61. Dosing tank; 62. Dosing pipeline; 70. Programmable logic controller; 80. Water inlet system; 81. Water inlet valve; 82. Water inlet pump; 83. Liquid inlet pipeline; 90. Mud discharge assembly; 91. Mud discharge valve; 92. Mud discharge pump; 93. Mud discharge pipeline.

[0025] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0029] See also Figures 1 to 3 , is a membrane bioreactor in an embodiment of the utility model, including a reaction mechanism and a water production mechanism.

[0030] Wherein: the reaction mechanism is used to carry out nitrification and denitrification of wastewater to achieve denitrification of wastewater, the reaction mechanism includes a reaction vessel 10 and an aeration device 20, the aeration device 20 is located below the reaction vessel 10, and the aeration device 20 is located at a local position at the bottom of the reaction vessel, so that the aeration device 20 aerates the wastewater in the local space of the reaction vessel 10, so that an aerobic area, an anoxic area and an anaerobic area are formed in the reaction vessel 10. Specifically, in the process that the space output by the aeration device 20 diffuses from the bottom of the reaction vessel 10 to the top thereof, the wastewater in the local space of the reaction vessel 10 forms a bottom-up flow direction, and drives the wastewater in other spaces in the reaction vessel 10 to form a top-down flow direction. Since the aeration device 20 is arranged at a local position at the bottom of the reaction vessel 10, the wastewater in the local space of the reaction vessel 10 flows from the bottom to the top of the reaction vessel 10. In the device 20, aeration bubbles flow longitudinally along the reaction vessel, forming a dissolved oxygen gradient in the reaction vessel 10 to form aerobic, anoxic and anaerobic regions, providing favorable conditions for the growth of different microorganisms. It is understandable that in regions with lower dissolved oxygen, partial short-range nitrification and denitrification are easily produced, so that the device's demand for organic carbon sources is reduced, thereby reducing the amount of carbon source added and reducing operating costs. It should be noted that the aeration zone area of ​​the aeration device 20 accounts for 1 / 8-1 / 2 of the bottom area of ​​the reaction vessel 10. The aeration zone area of ​​the aeration device 20 is small, and the gravity motion formed in the reaction vessel 10 plays a stirring role. Therefore, compared with traditional wastewater treatment systems, stirring equipment and sludge return equipment are not required, which simplifies the wastewater treatment system.

[0031] In this embodiment, the reaction vessel 10 is a cylindrical container, and the diameter-to-depth ratio of the reaction vessel 10 is 1:5-1:8. The diameter-to-depth ratio of the reaction vessel 10 is relatively small, and the denitrification effect can be achieved in the single reaction vessel 10. Compared with multiple reaction zones in traditional processes, the floor space can be saved by more than half.

[0032] In this embodiment, the water production mechanism includes a water collecting assembly 30 and a filter membrane box 40. The filter membrane box 40 is located at the top of the reaction container 10. The filter membrane box 40 is connected to the water collecting assembly 30. The water collecting assembly 30 is used to discharge the water filtered by the filter membrane box 40. It should be noted that the filter membrane box 40 includes a box body and a membrane assembly arranged in the box body. The membrane assembly is used to separate cement from wastewater. At the same time, the membrane assembly can intercept microorganisms in the wastewater into the reaction container 10.

[0033] In this embodiment, the water collecting assembly 30 includes a water collecting pipe 31 and a water production pump 32. The water collecting pipe 31 and the reaction container 10 are respectively located at opposite ends of the box body. The water collecting pipe 31 is connected to the box body of the filter membrane box 40. The water collecting pipe 31 is connected to the water production pump 32, that is, the box body is connected to the water production pump 32 through the water collecting pipe 31, and the water production pump 32 runs intermittently to achieve the purpose of drainage.

[0034] In this embodiment, the membrane biological reactor device also includes a monitoring mechanism 50 and a dosing mechanism 60 that are connected to each other. The monitoring mechanism 50 is used to monitor the specific parameters of the water discharged from the water collection component 30. The dosing mechanism 60 is connected to the reaction container 10. The dosing mechanism 60 is used to add corresponding reagents to the reaction container 10 based on the specific parameter items. It should be noted that the membrane biological reactor device also includes a programmable logic controller 70. The aeration equipment 20, the water production pump 32, the monitoring mechanism 50 and the dosing mechanism 60 are all connected to the programmable logic controller 70. It can be understood that the monitoring mechanism 50 will monitor the specific parameters of the water discharged from the water collection component 30 and send them to the programmable logic controller 70, so that the programmable logic controller 70 controls the dosing mechanism 60 to work according to the specific parameters.

[0035] In this embodiment, the monitoring mechanism 50 includes a dissolved oxygen meter 51, a total nitrogen meter 52, an ammonia nitrogen monitor 53 and a total phosphorus monitor 54. The dissolved oxygen meter 51, the total nitrogen meter 52, the ammonia nitrogen monitor 53 and the total phosphorus monitor 54 are all connected to the programmable logic controller 70. The dosing mechanism 60 includes at least one dosing pool 61, a dosing pump and a dosing pipeline 62. One end of the dosing pipeline 62 is connected to the reaction container 10, and the other end is connected to the dosing pump. The dosing pump is located in the dosing pool 61, that is, the dosing pool 61 is connected to the reaction container 10 through the dosing pump and the dosing pipeline 62. It can be understood that the number of dosing pools 61 is determined according to actual needs, and one dosing pool 61 is matched with a dosing pump and a dosing pipeline 62.

[0036] It should be noted that the nitrification coefficient and the denitrification coefficient are set in the programmable logic controller 70, and the values ​​of the water discharged from the water collection component 30 are automatically adjusted according to the ammonia nitrogen monitor 53 and the total nitrogen meter 52. When the ammonia nitrogen in the water liquid has an increasing trend, that is, it is lower than the nitrification coefficient, the programmable logic controller 70 controls the aeration device 20 to work, automatically increase the aeration volume, and achieve precise aeration, so that the nitrification coefficient of the discharged water liquid becomes larger, otherwise it becomes smaller; when the total nitrogen in the water liquid has an increasing trend, that is, it is lower than the denitrification coefficient, the programmable logic controller 70 controls the aeration device 20 to work, automatically reduce the aeration volume, and increase the denitrification coefficient of the discharged water liquid, otherwise it becomes smaller, thereby achieving fully automatic operation without the need for frequent manual operation.

[0037] Among them, the nitrification coefficient is used to characterize the degree of ammonia nitrogen removal, that is, the efficiency of nitrogen conversion from ammonia nitrogen to other forms (such as nitrate nitrogen and nitrite nitrogen); the denitrification coefficient is used to characterize the degree of total nitrogen removal, that is, the difference in total nitrogen in the influent.

[0038] It should be noted that there are two preparation tanks 61, one is the carbon source preparation tank 61, and the other is the phosphorus removal preparation tank 61. When the ammonia nitrogen in the water liquid is low and the total nitrogen is high, if the denitrification coefficient is reduced by controlling the dissolved oxygen only but the water liquid requirement is not met, the programmable logic controller 70 calculates the amount of medicine to be added according to the detected data, and then transports the corresponding agent and the amount of medicine from the carbon source preparation tank 61 to the reaction vessel 10 through the dosing pump; when the microbial phosphorus removal in the reaction vessel 10 does not meet the water liquid requirement, that is, the phosphorus content data of the water liquid detected by the total phosphorus monitor 54 is too high, the corresponding agent and the amount of medicine are transported from the phosphorus removal preparation tank 61 to the reaction vessel 10 through the dosing pump to realize automatic adjustment of the dosage.

[0039] In this embodiment, the membrane bioreactor device also includes a water inlet system 80, which is connected to the reaction container 10. The water inlet system 80 is used to transport wastewater into the reaction container 10. The water inlet system 80 includes an inlet valve 81 and an inlet pump 82. The inlet valve 81 and the inlet pump 82 are both connected to the programmable logic controller 70. A liquid inlet is opened on the reaction container 10, and the liquid inlet is connected to the water inlet pump 82 through an inlet pipe 83. The inlet valve 81 is installed on the inlet pipe 83. The liquid inlet is located at the bottom of the reaction container 10 and does not interfere with the aeration equipment 20.

[0040] In this embodiment, the membrane bioreactor device also includes a sludge discharge component 90. A sludge discharge port is opened on the reaction container 10, and the sludge discharge port is connected to the sludge discharge component 90. The sludge discharge component 90 is used to discharge the sludge in the reaction container 10. The sludge discharge component 90 includes a sludge discharge pipe 93, a sludge discharge valve 91 and a sludge discharge pump 92. The sludge discharge valve 91 is installed on the sludge discharge pipe 93. A sludge discharge port is opened at the bottom of the reaction container 10. The sludge discharge pump 92 is placed at the bottom of the reaction container 10. One end of the sludge discharge pipe 93 is connected to the sludge discharge pump 92. The sludge is discharged through the sludge discharge port and the sludge discharge pipe 93. The sludge pump 92 and the sludge discharge valve 91 are both connected to the programmable logic controller 70. It can be understood that the operation of the water inlet pump can be controlled by the programmable logic controller 70 to realize the water inlet operation of the device, and the operation of the sludge discharge pump 92 can be controlled by the programmable logic controller 70 to realize the sludge discharge operation of the device.

[0041] In the specific implementation, the aeration device 20 is arranged at the bottom of the reaction vessel 10, and the aeration device 20 is used to aerate the wastewater in the local space of the reaction vessel 10, so that the wastewater above the aeration device 20 forms a bottom-up flow state, and drives the wastewater in other spaces in the reaction vessel 10 to flow from top to bottom, thereby forming a dissolved oxygen gradient in the reaction vessel 10, realizing the formation of aerobic areas, anoxic areas and anaerobic areas in the reaction vessel 10, providing favorable conditions for the growth of different microorganisms, and in this process, partial short-range nitrification and denitrification are easily generated, so that the demand for organic carbon sources of the device is reduced, thereby reducing the amount of carbon source added, and at the same time, the air output by the aeration device 20 is discharged from the reaction vessel 10 In the process of diffusing from the bottom to the top, it fully contacts with the wastewater to improve the oxygen utilization rate. Then, the filter membrane box 40 is set on the top of the reaction container 10, so that the wastewater from the reaction container 10 can be filtered through the filter membrane box 40 and then discharged through the water collection component 30 to ensure that the microorganisms will not flow out with the overflowing water. In addition, through the coordinated use of the monitoring mechanism 50 and the dosing mechanism 60, automatic addition of agents is realized without frequent manual operation. Different from the prior art, it can achieve denitrification effect in a single reaction container 10, simplifying the operation of the wastewater treatment system, saving a certain amount of floor space, and also helping to reduce wastewater treatment costs and improve wastewater treatment efficiency.

[0042] It should be noted that the above implementation process is only to illustrate the feasibility of the present application, but this does not mean that the membrane bioreactor device of the present application has only the above-mentioned implementation process. On the contrary, as long as the membrane bioreactor device of the present application can be implemented, it can be included in the feasible implementation plan of the present application.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A membrane bioreactor, characterized in that: It includes reaction mechanism and water production mechanism; The reaction mechanism includes a reaction container and an aeration device located at the bottom of the reaction container, wherein the aeration device is used to aerate the wastewater in a local space of the reaction container so as to form an aerobic region, an anoxic region and an anaerobic region in the reaction container; The water production mechanism includes a water collection component and a filter membrane box, the filter membrane box is located at the top of the reaction container, the filter membrane box is connected to the water collection component, and the water collection component is used to discharge the water filtered by the filter membrane box; Among them, the membrane bioreactor device also includes a connected monitoring mechanism and a dosing mechanism, the monitoring mechanism is used to monitor the specific parameters of the water discharged by the water collection component, the dosing mechanism is connected to the reaction container, and the dosing mechanism is used to add corresponding reagents into the reaction container based on the specific parameters.

2. The membrane bioreactor according to claim 1, characterized in that: The reaction container is a cylindrical container, and the diameter-to-depth ratio of the reaction container is 1:5-1:

8.

3. The membrane bioreactor according to claim 1, characterized in that: The ratio of the aeration zone area of ​​the aeration equipment to the bottom area of ​​the reaction container is 1 / 8-1 / 2. The filter membrane box includes a box body and a membrane assembly arranged in the box body. The membrane assembly is used for cement separation of the wastewater.

4. The membrane bioreactor according to claim 1, characterized in that: The membrane bioreactor also includes a water inlet system, which is connected to the reaction container and is used to transport the wastewater into the reaction container.

5. The membrane bioreactor according to claim 4, characterized in that: The water inlet system comprises a water inlet valve and a water inlet pump. The reaction container is provided with a liquid inlet, the liquid inlet is connected to the water inlet pump via a liquid inlet pipe, and the water inlet valve is installed on the liquid inlet pipe.

6. The membrane bioreactor according to claim 5, characterized in that: The water collection component includes a water collection pipe and a water production pump. The water collection pipe is communicated with the filter membrane box, and the filter membrane box is connected to the water production pump through the water collection pipe.

7. The membrane bioreactor according to claim 6, characterized in that: The membrane biological reaction device also includes a programmable logic controller, and the aeration equipment, the water inlet valve, the water inlet pump and the water production pump are all connected to the programmable logic controller.

8. The membrane bioreactor according to claim 1, characterized in that: The membrane biological reaction device also includes a mud discharge component. The reaction container is provided with a mud discharge port, and the mud discharge port is connected to the mud discharge component.

9. The membrane bioreactor according to claim 7, characterized in that: The monitoring mechanism includes a dissolved oxygen meter, a total nitrogen meter, an ammonia nitrogen monitor and a total phosphorus monitor, and the dissolved oxygen meter, the total nitrogen meter, the ammonia nitrogen monitor and the total phosphorus monitor are all connected to the programmable logic controller.

10. The membrane bioreactor according to claim 1, characterized in that: The drug-adding mechanism comprises at least one drug-dispensing tank, a drug-adding pump and a drug-adding pipeline. The drug-adding pump is connected to the drug-adding pipeline, and the drug-dispensing tank is connected to the reaction container through the drug-adding pipeline.

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