AO + MBR integrated sewage treatment equipment

Abstract

The utility model discloses AO + MBR (membrane bioreactor) integrated sewage treatment equipment, and aims to provide an efficient, stable and economical sewage treatment solution. The equipment integrates an anoxic zone, an aerobic zone, a clean water tank, an upper-layer equipment zone and a lower-layer equipment zone, and realizes organic matter degradation, denitrification, dephosphorization and disinfection processes through a submersible stirrer, an aerator, an MBR membrane assembly, a rotary blower, a water production / backwashing pump, a reflux pump and a plurality of dosing devices. The equipment is skillfully designed, such as a double-layer structure, a single-pump dual-purpose device, a pipeline type oxygen eliminating device and the like, so that the effective utilization of space and the flexibility of operation are ensured, and meanwhile, the treatment effect is ensured to meet or exceed the first-grade A emission standard. Besides, by reducing the equipment size, simplifying the pipeline system and adopting the integrated design, the engineering cost and the operation and maintenance difficulty are remarkably reduced, and the device is suitable for small sewage treatment projects and shows excellent performance and economic benefits of integrated equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment and relates to AO+MBR integrated sewage treatment equipment. Background Art

[0002] When the scale of sewage treatment is large, a complete sewage treatment plant is generally built, and the main structure adopts a reinforced concrete structure; on the contrary, when the scale of sewage treatment is small, integrated sewage treatment equipment is often used. Integrated sewage treatment equipment is commonly used in township or rural sewage treatment projects. The characteristics of integrated sewage treatment equipment are modular equipment, system integration, short production period, small footprint, and low project investment.

[0003] At present, there are many types of integrated sewage treatment equipment commonly seen in the market, with uneven quality, and the sewage treatment processes used are also varied, with different actual treatment effects. The more common sewage treatment processes are mainly anaerobic anoxic aerobic (abbreviated as "AAO") process, moving bed biofilm reactor (abbreviated as "MBBR") process, and membrane bioreactor (abbreviated as "MBR") process. Among them, the AAO process is a traditional activated sludge process for biological nitrogen and phosphorus removal. It is a commonly used process in large and medium-sized sewage treatment plants. When used in integrated equipment, it has the advantages of simple structure and low cost, but it also has the disadvantages of easy loss of sludge and easy expansion of sludge, resulting in unstable treatment effect. The MBBR process adds suspended fillers to the conventional process. It is essentially a treatment process between the activated sludge process and the biofilm process. Therefore, it has the advantages of both the activated sludge process and the biofilm process, and has the advantages of good treatment effect, sludge is not easy to lose, and good impact resistance. Its disadvantages are high cost of suspended fillers and easy failure of fluidization of suspended fillers. The MBR process uses a microfiltration membrane to replace the secondary sedimentation tank in the conventional process. It has the significant advantage of good effluent quality and the disadvantages of high construction cost and high operating costs.

[0004] The AO process consists of an anoxic unit and an aerobic unit. The main function of the aerobic unit is to remove organic matter from sewage through aerobic biochemical reactions and convert ammonia nitrogen into nitrate nitrogen through nitrification reactions; the main function of the anoxic unit is to convert nitrate nitrogen returned from the aerobic pool into nitrogen gas through denitrification reactions, thereby achieving biological denitrification of sewage. The AAO process consists of anaerobic, anoxic and aerobic units, and the main function of the added anaerobic unit is to achieve biological phosphorus removal. Large and medium-sized sewage treatment plants generally adopt a relatively complete AAO process that has both nitrogen removal and phosphorus removal, while small-scale sewage treatment systems pay more attention to practicality, and often consider giving priority to the limited carbon source in sewage for biological denitrification, while phosphorus removal mainly adopts chemical phosphorus removal. Therefore, the biochemical system generally adopts the AO process.

[0005] MBR essentially uses microfiltration membranes to replace traditional secondary sedimentation tanks to achieve mud-water separation. Microfiltration membrane filtration is a physical filtration, water can pass through the microfiltration membrane, and substances larger than the membrane pore size are retained. The significant advantages of MBR are: 1. The pore size of the microfiltration membrane is smaller than the bacteria in the sludge, so the bacteria and other microorganisms in the sludge are completely retained, and the effluent water quality is very good; 2. The activated sludge is efficiently intercepted, and the biochemical system can obtain a very high sludge concentration, and its treatment efficiency is significantly improved; 3. There will be no sludge loss, and there is no need to worry about sludge swelling. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide an AO+MBR integrated sewage treatment equipment, aiming to combine the advantages of different processes, overcome the defects of the existing technology, and provide a more efficient, stable and economical sewage treatment solution.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an AO+MBR integrated sewage treatment equipment, comprising an anoxic zone, an aerobic zone, a clear water tank, an upper equipment zone and a lower equipment zone, the anoxic zone is connected to the aerobic zone, and the clear water tank and the upper equipment zone are arranged above the lower equipment zone; a submersible mixer is arranged in the anoxic zone, an aerator and an aeration pipeline are arranged below the aerobic zone, and MBR membrane components and deoxidizers are arranged at the ends thereof, respectively; a rotary blower is arranged in the upper equipment zone, and a water production / backwash pump, a reflux pump, a carbon source dosing device, a dephosphorization agent dosing device and a disinfectant dosing device are arranged in the lower equipment zone.

[0008] Optionally, the aeration pipeline is connected to a rotary blower, and air is provided to the aerator through the rotary blower to form an aerobic state, thereby achieving degradation of organic matter and nitrification reaction of ammonia nitrogen.

[0009] Optionally, the MBR membrane assembly is connected to the aeration pipe through a hose and a quick connector, and is connected to the rotary blower; the water production pipeline of the MBR membrane assembly is also connected to the water production / backwash pump through a hose and a quick connector.

[0010] Optionally, the water production / backwashing pump is connected to the MBR membrane assembly and the clean water tank through pipelines respectively, and both are provided with bypass pipelines with electric valves, and the water production or backwashing of the water pump is achieved by switching the electric valves.

[0011] Optionally, a pipeline-type deoxidizer is vertically arranged at the end of the aerobic zone, and the bottom of the deoxidizer is connected to a reflux pump, one end of the reflux pump is connected to the deoxidizer, and the other end is connected to the anoxic zone through a pipeline.

[0012] Optionally, a water inlet pipe is provided on the anoxic zone, and a water outlet pipe is provided on the clean water tank.

[0013] The beneficial effects of the utility model are:

[0014] 1) The utility model is an AO+MBR integrated sewage treatment equipment, which adopts a mature, stable and reliable sewage treatment process, has strong impact load resistance, good treatment effect, and the effluent water quality stably reaches the Class A standard or higher standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants";

[0015] 2) The utility model is an AO+MBR integrated sewage treatment equipment, which has the advantages of compact structure and high integration through clever design, fully demonstrates the advantages of integrated equipment, saves engineering cost, and improves the convenience of operation and maintenance;

[0016] 3) The utility model is an AO+MBR integrated sewage treatment equipment, which has a creative design of a double-layer equipment area, and a water production / backwash pump, a reflux pump and a dosing device are arranged in the lower equipment area, and a clear water tank and an upper equipment area are arranged in the upper layer. A rotary blower is installed in the upper equipment area. The double-layer design makes full use of the space of the equipment, reduces the size of the equipment, and reduces the floor space of the equipment;

[0017] 4) The utility model is an AO+MBR integrated sewage treatment equipment, which cleverly realizes the use of one water pump as both a water production pump and a backwashing water pump through reasonable design of the water pump pipeline and valve, which not only saves project investment, but also saves land and reduces the size of the equipment;

[0018] 5) The utility model is an AO+MBR integrated sewage treatment equipment, which innovatively designs a pipeline deoxidizer, which is particularly suitable for small sewage treatment equipment. The reflux pump draws the mixed liquid from the deoxidizer, and the function of the deoxidizer is to eliminate the oxygen in the mixed liquid to avoid the mixed liquid that flows back to the anoxic zone containing a large amount of oxygen and destroying the anoxic environment of the anoxic zone.

[0019] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0021] Figure 1 This is the upper floor plan of the utility model AO+MBR integrated sewage treatment equipment;

[0022] Figure 2This is the lower floor plan of the utility model AO+MBR integrated sewage treatment equipment;

[0023] Figure 3 for Figure 1 Middle aa section view;

[0024] Figure 4 for Figure 1 Middle bb cross-sectional view.

[0025] Figure numerals: anoxic zone 1, aerobic zone 2, lower equipment area 3, clean water tank 4, upper equipment area 5, water inlet pipe 11, submersible mixer 12, MBR membrane assembly 21, aerator 22, deoxidizer 23, water production / backwash pump 31, reflux pump 32, carbon source dosing device 33, dephosphorization agent dosing device 34, disinfectant dosing device 35, water outlet pipe 41, rotary blower 51. DETAILED DESCRIPTION

[0026] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0027] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0028] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0029] See also Figure 1 to Figure 4 , for a processing capacity of 100m 3 / d AO+MBR integrated sewage treatment equipment is used to treat domestic sewage. The treated effluent meets the Class A standard in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants", including anoxic zone 1, aerobic zone 2, clear water tank 4, upper equipment zone 5 and lower equipment zone 3, which are integrated. The hydraulic retention time of anoxic zone 1 is 4h, and a submersible mixer 12 is installed. Sewage enters from the upper part of anoxic zone 1 and flows from the lower part of the anoxic tank into aerobic zone 2 by gravity; the hydraulic retention time of aerobic zone 2 is 6.5h, and an aerator 22 and an aeration pipeline are arranged below the aerobic zone 2. The aerator 22 is a disc rubber membrane microporous aerator 22. MBR membrane components 21 are also arranged at the ends of the aerobic zone 2. The MBR membrane components 21 use hollow fiber membranes made of PVDF, and the designed membrane flux is 15L / (h·m 2 ); The upper equipment area 5 is provided with a rotary blower 51 for aeration of the aerobic zone 2 and the MBR membrane assembly 21. The noise of the rotary blower 51 is relatively low, which effectively reduces the impact on the surrounding environment. The lower equipment area 3 is provided with a water production / backwash pump 31, a reflux pump 32, and a carbon source dosing device 33, a dephosphorization agent dosing device 34 and a disinfectant dosing device 35. The aeration pipeline is connected to the rotary blower 51, and air is provided to the aerator 22 through the rotary blower 51 to form an aerobic state, thereby realizing the degradation of organic matter and the nitrification reaction of ammonia nitrogen. The MBR membrane assembly 21 is connected to the aeration pipeline through a hose and a quick connector, and is connected to the rotary blower 51, and shares one blower with the aerobic tank aerator 22, through the blowing effect of air The membrane pollution is alleviated; the water production pipeline of the MBR membrane assembly 21 is also connected to the water production / backwashing pump 31 through a hose and a quick connector. The water production / backwashing pump 31 is connected to the MBR membrane assembly 21 and the clean water tank 4 through pipelines, and a bypass pipeline with an electric valve is provided. The water pump produces water or backwashes by switching the electric valve. A pipeline-type deoxidizer 23 is also vertically provided at the end of the aerobic zone 2. The bottom of the deoxidizer 23 is connected to the reflux pump 32. One end of the reflux pump 32 is connected to the deoxidizer 23, and the other end is connected to the anoxic zone 1 through a pipeline, so that the mixed liquid of the aerobic zone 2 is refluxed to the anoxic zone 1 to achieve biological denitrification. The reflux ratio is 150% to 250%. The anoxic zone 1 is provided with a water inlet pipe 11, and the clean water tank 4 is provided with a water outlet pipe 41.

[0030] In this embodiment, a proper amount of sodium hypochlorite is added to the backwash water by the disinfectant dosing device 35. Since most of the bacteria have been intercepted, the clean water entering the clean water tank 4 only needs to be added with a small amount of sodium hypochlorite to meet the disinfection requirements and reach the discharge standard.

[0031] In this embodiment, the aerobic zone 2 is provided with a mud discharge port and a mud discharge valve.

[0032] In this embodiment, the clear water tank 4 and the upper equipment area 5 are arranged above the lower equipment area 3, and the effective volume of the clear water tank 4 meets the hydraulic retention time of 30 minutes. Finished sodium hypochlorite is added as a disinfectant, and after disinfection with sodium hypochlorite, the effluent meets the discharge standard and is discharged from the integrated treatment equipment.

[0033] In this embodiment, the carbon source dosing device 33 is a set of sodium acetate dosing barrels, which add sodium acetate as a supplementary carbon source for denitrification in the anoxic zone 1; the dephosphorization agent dosing device 34 is a set of polyaluminum chloride dosing barrels, which add polyaluminum chloride to the aerobic zone 2 to achieve chemical phosphorus removal; the disinfectant dosing device 35 is a set of sodium hypochlorite dosing barrels, which add sodium hypochlorite to the water production pipeline for effluent disinfection and backwash disinfection.

[0034] When the utility model is used, the following steps are included:

[0035] S1, sewage first enters the anoxic zone 1, the environment in the anoxic zone 1 is anoxic, and there is no molecular oxygen. The carbon source is added to the anoxic zone 1 through the carbon source dosing device 33 for denitrification in the anoxic zone 1. The denitrifying bacteria are suspended in the sewage, and the organic matter in the influent is used to reflux the mixed liquid of the aerobic tank, so that the nitrate nitrogen therein undergoes a denitrification reaction in the anoxic tank and is converted into nitrogen gas, thereby being removed;

[0036] S2, the effluent from the anoxic zone 1 enters the aerobic zone 2. In the aerobic zone 2, air is supplied to the aerator 22 at the bottom of the aerobic zone 2 through the rotary blower 51, so as to oxygenate the sewage in the aerobic zone 2, thereby forming an aerobic state, and aerobic microorganisms are suspended in the sewage.

[0037] S3, the suspended mixed liquid in the aerobic zone 2 enters the deoxidizer 23 from top to bottom. During this process, the oxygen in the sewage is released, and the suspended mixed liquid without oxygen enters the reflux pump 32 and flows back to the anoxic zone 1;

[0038] S4, the MBR membrane assembly 21 is used to transport water through the MBR membrane assembly 21 to the clean water tank 4 through the water production / backwashing pump 31 of the lower equipment area 3, or to achieve backwashing of the microfiltration membrane;

[0039] S41, when filtering and producing water, the water inlet valve and the water outlet valve are opened, so that the water pump can absorb water from the MBR membrane assembly 21 and transport it to the clean water tank 4;

[0040] S42, when backwashing, the backwashing water inlet valve and the water outlet valve are opened, so that the water pump can absorb water from the clean water tank 4 and transport it to the MBR membrane assembly 21 to backwash the microfiltration membrane.

[0041] In the utility model, in step S1, under the stirring and mixing action of the submerged mixer 12 arranged at the bottom of the anoxic zone 1, the sewage fully contacts and reacts with the suspended denitrifying bacteria, effectively promoting the denitrification reaction and avoiding the formation of a dead zone in the anoxic zone 1.

[0042] In the utility model, in the aerobic pool, on the one hand, organic matter in the sewage is converted into carbon dioxide and water through the metabolism of aerobic microorganisms, and on the other hand, ammonia nitrogen in the sewage is converted into nitrate nitrogen under the action of nitrifying bacteria.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. An AO+MBR integrated sewage treatment equipment, characterized in that: It includes an anoxic area, an aerobic area, a clear water tank, an upper equipment area and a lower equipment area that are integrated, the anoxic area is connected with the aerobic area, and the clear water tank and the upper equipment area are arranged above the lower equipment area; Aerators and aeration pipes are arranged below the aerobic zone, at the ends of which MBR membrane components and deoxidizers are arranged respectively. A rotary blower is arranged in the upper equipment area, and a water production / backwash pump, a reflux pump, a carbon source dosing device, a dephosphorization agent dosing device and a disinfectant dosing device are arranged in the lower equipment area.

2. The AO+MBR integrated sewage treatment equipment according to claim 1, characterized in that: The aeration pipe is connected to the rotary blower, and air is provided to the aerator through the rotary blower to form an aerobic state, thereby achieving the degradation of organic matter and the nitrification reaction of ammonia nitrogen.

3. The AO+MBR integrated sewage treatment equipment according to claim 2, characterized in that: The MBR membrane assembly is connected to the aeration pipe through a hose and a quick connector, and is connected to the rotary blower; the water production pipeline of the MBR membrane assembly is also connected to the water production / backwash pump through a hose and a quick connector.

4. The AO+MBR integrated sewage treatment equipment according to claim 1, characterized in that: The water production / backwashing pump is connected to the MBR membrane assembly and the clean water tank through pipelines respectively, and both are provided with bypass pipelines with electric valves. The water production or backwashing of the water pump is achieved by switching the electric valves.

5. The AO+MBR integrated sewage treatment equipment according to claim 1, characterized in that: A pipeline-type deoxidizer is also vertically arranged at the end of the aerobic zone. The bottom of the deoxidizer is connected to a reflux pump. One end of the reflux pump is connected to the deoxidizer, and the other end is connected to the anoxic zone through a pipeline.

6. The AO+MBR integrated sewage treatment equipment according to claim 1, characterized in that: A water inlet pipe is arranged on the anoxic zone, and a water outlet pipe is arranged on the clean water tank.

7. The AO+MBR integrated sewage treatment equipment according to claim 1, characterized in that: A submersible mixer is installed in the anoxic zone.

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