Sludge-membrane symbiotic sewage treatment system
The mud-film symbiotic sewage treatment system addresses slow biofilm formation and high transformation costs by integrating fixed-bed biofilm devices with activated sludge, achieving efficient sewage treatment capacity and compliance with Class V standards with reduced startup time and excess sludge production.
Patent Information
- Application Number
- CN202421031578.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-13
AI Technical Summary
Existing sewage treatment plants face challenges such as slow biofilm formation, high transformation costs, and wear on tanks due to the use of suspended carriers in the Integrated Filtrated-Film Assisted Sludge (IFAS) process. IFAS combines suspended and fixed biofilm technology, and the need for redesigning tank configuration and aeration systems, which are not suitable for plants lacking space for new facilities.
A mud-film symbiotic sewage treatment system that integrates fixed-bed biofilm devices with activated sludge, allowing for rapid biofilm formation and increased biomass without requiring modifications to existing tank configurations, using biofilm fillers with hydrophilic and antistatic coatings, and a modular design for easy installation.
The system achieves high treatment capacity, meets surface water Class V standards, reduces startup time, and minimizes excess sludge production while maintaining low transformation costs and easy installation, enhancing organic and nitrogen load removal.
Smart Images
Figure CN222250277U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment, in particular to a mud-film symbiotic sewage treatment system. Background Art
[0002] To advance urban wastewater treatment and resource utilization, existing urban wastewater treatment facilities are required to be upgraded and renovated to improve effluent discharge standards. The most common solution for upgrading wastewater treatment plants is to expand tank capacity or add new treatment units. However, some plants lack sufficient space for new treatment facilities. Consequently, some have opted for the Integrated Filtrated-Film Assisted Sludge (IFAS) process. IFAS combines suspended activated sludge with biofilm technology. Biofilms are added to the activated sludge reactor to increase the surface area for microbial growth without increasing reactor size. Currently, suspended carriers are the most common biocarriers used in IFAS. However, their application has several drawbacks: ① the tank configuration and aeration system must be redesigned to facilitate fluidization; ② biofilm formation on the carrier is slow, resulting in a long startup time; and ③ the carriers can cause significant wear on the tank over extended periods of operation.
[0003] Therefore, sewage treatment plants need a mud-membrane symbiotic process with low transformation cost, short start-up time and simple operation. Utility Model Content
[0004] In response to the above-mentioned deficiencies in the existing technology, the utility model provides a mud-membrane symbiotic sewage treatment system, which does not require the modification of the existing pool body and has the effect of increasing the organic load, ammonia nitrogen load and total nitrogen load of the biochemical system, so that the effluent water quality meets the surface water Class V water standard (except total nitrogen).
[0005] The technical solutions provided by this utility model are as follows:
[0006] A mud-film symbiotic sewage treatment system comprises: an aerobic tank, a first fixed-bed biofilm device, a sludge return pipeline and a secondary sedimentation tank; the aerobic tank and the secondary sedimentation tank are connected in sequence according to the direction of water flow; one end of the sludge return pipeline is arranged at the bottom of the aerobic tank, and the other end of the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank; suspended activated sludge and the first fixed-bed biofilm device are arranged in the aerobic tank; the first fixed-bed biofilm device comprises at least one fixed-bed biofilm module, the fixed-bed biofilm module comprises a biofilm solid-carrying unit, the biofilm solid-carrying unit comprises a plurality of suspended and fixed biofilm fillers, and the spacing between adjacent biofilm fillers is 20-500 mm, forming a mud-water channel.
[0007] Based on the flow direction, the wastewater is sequentially treated in the aerobic tank and the secondary sedimentation tank, with the clear liquid overflowing from the secondary sedimentation tank being discharged as system effluent. Simultaneously, the sludge at the bottom of the secondary sedimentation tank flows back to the aerobic tank via a sludge return line, achieving sludge return. A fluid conveying device, specifically a pump, is provided within the sludge return line.
[0008] Furthermore, phosphorus removal agents can be added to the secondary sedimentation tank to enhance the phosphorus removal effect.
[0009] Its further technical solution is that the mud-film symbiotic sewage treatment system also includes an anoxic tank, the anoxic tank is connected to the aerobic tank, and the sewage passes through the anoxic tank, the aerobic tank and the secondary sedimentation tank in sequence; one end of the sludge return pipeline is arranged at the bottom of the anoxic tank, and the other end of the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank; suspended activated sludge and a second fixed bed biofilm device are provided in the anoxic tank; the second fixed bed biofilm device includes at least one fixed bed biofilm module.
[0010] In this solution, wastewater is sequentially treated in the anoxic tank, aerobic tank, and secondary sedimentation tank, depending on the flow direction. The overflow from the secondary sedimentation tank is then discharged as system effluent. Simultaneously, sludge at the bottom of the secondary sedimentation tank flows back to the anoxic tank via a sludge return line, achieving sludge return. A fluid conveying device, specifically a pump, is provided within the sludge return line.
[0011] In the mud-film symbiotic sewage treatment system provided by the utility model, the anoxic tank and the aerobic tank adopt a combination of suspended activated sludge and a fixed bed biofilm device. The biofilm filler can provide an effective carrier for the growth of microorganisms, can quickly intercept a large amount of activated sludge, increase the system biomass, and enhance the treatment capacity of the biochemical system.
[0012] It should be noted that the biofilm solid support unit includes multiple suspended and fixed biofilm fillers, and the spacing between adjacent biofilm fillers is set to 20-500mm to form a muddy water channel, which is conducive to the attachment and growth of organisms; the distance between the biofilm solid support unit and the bottom of the fixed bed biofilm module is 150-1000mm.
[0013] A further technical solution is that a plurality of the fixed-bed biofilm modules are stacked and arranged from top to bottom, and adjacent fixed-bed biofilm modules are connected to each other.
[0014] Specifically, a plurality of the fixed-bed biofilm modules are stacked and laid out from top to bottom to fill the space in the anoxic tank and the aerobic tank, thereby improving the sewage treatment capacity.
[0015] The adjacent fixed-bed biofilm modules are connected to each other, and can be locked by fasteners.
[0016] It should be noted that the biofilm filler of the biofilm solidification unit has the functions of high porosity, high biocompatibility and high adsorption performance. The material used is one or more of polyester fiber, polypropylene, polyethylene and polyurethane. The surface and interior of the filler are coated or sprayed with hydrophilic agent and antistatic agent.
[0017] Preferably, the filling rate of the filler can be set at 10-150m 2 / m 3 .
[0018] A further technical solution is that the mud-film symbiotic wastewater treatment system also includes a nitrification liquid return line, one end of which is located in the anoxic tank, and the other end of which is located at the bottom of the aerobic tank's outlet. A fluid conveying device is provided in the nitrification liquid return line. Specifically, the fluid conveying device is a pump. The sludge mixture in the aerobic tank is returned to the anoxic tank through the nitrification liquid return line.
[0019] A further technical solution is that the anoxic pool and the aerobic pool are separated by a partition wall, the partition wall is provided with a flow hole, a water distribution pipe is provided in the flow hole, and the water outlet of the water distribution pipe leads to the bottom of the aerobic pool.
[0020] A further technical solution is that a water collecting trough is provided on one side of the aerobic tank adjacent to the secondary sedimentation tank, a water distribution pipe is provided at the outlet of the water collecting trough, and the water outlet of the water distribution pipe leads to the bottom of the secondary sedimentation tank.
[0021] A further technical solution is that the anoxic tank is provided with a stirring device, which includes a flow propeller and / or a perforated pipe, wherein the flow propeller is provided at the outlet side of the anoxic tank and the perforated pipe is provided at the bottom of the anoxic tank. The stirring device is used to stir and mix the sludge.
[0022] A further technical solution is that an aeration device is provided at the bottom of the aerobic tank, and the aeration device includes at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex aerator, and a nano aeration tube. The aeration device is used to provide aeration and oxygenation for the aerobic tank.
[0023] The treatment process of the mud-film symbiotic sewage treatment system provided by the present invention is as follows: on the basis of the traditional activated sludge method AO process, a fixed bed biofilm device is set in the anoxic tank and / or the aerobic tank, and the fixed bed biofilm device contains multiple fixed bed biofilm modules. The biofilms fixedly grown on the multiple fixed bed biofilm modules and the suspended activated sludge jointly participate in the removal of pollutants in the sewage, directly improving the organic load, ammonia nitrogen load and total nitrogen load of the biochemical system.
[0024] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:
[0025] The mud-film symbiotic sewage treatment system provided by the utility model combines activated sludge with a fixed-bed biofilm device:
[0026] 1. It has the advantages of low transformation cost and easy installation: the existing biochemical pool system can be directly installed with fixed-bed biofilm modules according to the site conditions and the characteristics of anoxic and aerobic conditions, without the need for additional transformation. The modules adopt a standardized and modular design concept, with flexible module assembly and short construction period.
[0027] 2. Biofilm grows on the biological filler, and activated sludge is suspended around the biological filler, which increases the biomass and enhances the sewage treatment capacity and impact resistance of the system, so that the effluent of the system can meet the surface water Class V standard.
[0028] 3. Fast biofilm formation and short startup time. The biofilm filler in the fixed-bed biofilm module has a rough and porous surface, is highly hydrophilic and biocompatible, and can quickly intercept activated sludge to form a biofilm. The startup time does not exceed 48 hours.
[0029] 4. Enhanced activated sludge settling performance and reduced excess sludge production. The biofilm filler is suspended and fixed to the fixed-bed biofilm module, which does not increase the concentration of activated sludge or the sedimentation load of the secondary sedimentation tank. The biofilm that falls off the filler and mixes with the activated sludge can also reduce the SVI and improve sludge settling performance. At the same time, the biofilm has a longer sludge age than the activated sludge, which can reduce the corresponding excess sludge production. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.
[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0032] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0033] Figure 1 Schematic diagram of the mud-membrane symbiotic sewage treatment system provided in Example 1 of the utility model.
[0034] Figure 2Schematic diagram of the mud-membrane symbiotic sewage treatment system provided in Example 2 of the present utility model.
[0035] Figure 3 This is a schematic structural diagram of a single fixed-bed biofilm module provided in Example 2 of the present utility model.
[0036] Reference numerals
[0037] Mud-film symbiotic sewage treatment system 1, suspended activated sludge 10, anoxic tank 11, aerobic tank 12, secondary sedimentation tank 13, sludge return pipeline 14, nitrification liquid return pipeline 15, first fixed-bed biofilm device 121, microporous aerator 122, second fixed-bed biofilm device 111, flow pusher 112, upper fixed-bed biofilm module 1111 of anoxic tank, lower fixed-bed biofilm module 1112 of anoxic tank, upper fixed-bed biofilm module 1211 of aerobic tank, lower fixed-bed biofilm module 1212 of aerobic tank, biofilm solid support unit 11111 of anoxic tank. DETAILED DESCRIPTION
[0038] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0039] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.
[0040] It should also be understood that the terms used in this specification of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the specification of the embodiments of the present invention and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.
[0041] Example 1
[0042] like Figure 1As shown, this embodiment provides a mud-film symbiotic sewage treatment system 1, including an aerobic tank 12, a secondary sedimentation tank 13 and a sludge return pipeline 14. The aerobic tank 12 and the secondary sedimentation tank 13 are connected in sequence according to the direction of water flow; the aerobic tank 12 is provided with suspended activated sludge 10 and a first fixed bed biofilm device 121. One end of the sludge return pipeline 14 is arranged at the bottom of the aerobic tank 12 (preferably close to the bottom of the water inlet side of the aerobic tank 12), and the other end of the sludge return pipeline 14 is arranged at the bottom of the secondary sedimentation tank 13. Among them, the first fixed bed biofilm device 121 includes at least one fixed bed biofilm module, and a plurality of the fixed bed biofilm modules are stacked flatly from top to bottom, and adjacent fixed bed biofilm modules are connected to each other.
[0043] Specifically, in this embodiment, two layers of fixed bed biofilm modules are set in the first fixed bed biofilm device 121 located in the aerobic tank 12, which are respectively recorded as the upper layer fixed bed biofilm module 1211 of the aerobic tank and the lower layer fixed bed biofilm module 1212 of the aerobic tank.
[0044] The fixed-bed biofilm module includes a biofilm solid-carrying unit, which includes a plurality of suspended and fixed biofilm fillers. The spacing between adjacent biofilm fillers is 20-500 mm, forming a muddy water channel.
[0045] In this embodiment, an aeration device is provided at the bottom of the aerobic pool 12. The aeration device includes at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex aerator, and a nano aeration tube. The aeration device is used to provide aeration and oxygenation for the aerobic pool.
[0046] Specifically, the bottom aeration device of the aerobic tank 12 of this embodiment is a microporous aerator, which is set to have a strong aeration effect.
[0047] In the mud-film symbiotic wastewater treatment system 1 provided in this embodiment, wastewater is sequentially treated in the aerobic tank 12 and the secondary sedimentation tank 13 according to the direction of water flow. Finally, the clear liquid overflowing from the secondary sedimentation tank 13 is discharged as system effluent. Simultaneously, sludge at the bottom of the secondary sedimentation tank 13 flows back to the aerobic tank 12 via a sludge return line 14, achieving sludge return. A fluid conveying device (not shown) is provided within the sludge return line 14. Specifically, the fluid conveying device is a pump.
[0048] In this embodiment, a phosphorus removal agent may be added into the secondary sedimentation tank 13 to enhance the phosphorus removal effect.
[0049] Example 2
[0050] See Figure 2Based on Example 1, this embodiment provides a sludge-film symbiotic wastewater treatment system 1, comprising an anoxic tank 11, an aerobic tank 12, a secondary sedimentation tank 13, a sludge return pipeline 14, and a nitrification solution return pipeline 15. The anoxic tank 11, aerobic tank 12, and secondary sedimentation tank 13 are sequentially connected in the direction of water flow; the anoxic tank 11 contains suspended activated sludge 10 and a second fixed-bed biofilm device 111.
[0051] The second fixed bed biofilm device 111 includes at least one fixed bed biofilm module. A plurality of the fixed bed biofilm modules are stacked from top to bottom, and adjacent fixed bed biofilm modules are connected to each other.
[0052] In a specific implementation, the plurality of fixed-bed biofilm modules are stacked and laid flat to form a fixed-bed biofilm device, which fills the space in the anoxic tank 11 and the aerobic tank 12 ; adjacent fixed-bed biofilm modules are locked with fasteners.
[0053] It is understandable that the first fixed bed biofilm device 121 and the second fixed bed biofilm device 111 may be completely identical, or may be adaptively designed according to the actual use requirements of the anoxic tank 11 and the aerobic tank 12 .
[0054] In other embodiments, the fixed-bed biofilm modules are arranged according to the actual tank space of the anoxic tank 11 and the aerobic tank 12, and can be stacked in 2-6 layers. For example, in this embodiment, two layers of fixed-bed biofilm modules are arranged in the second fixed-bed biofilm device 111 located in the anoxic tank 11, respectively denoted as: an anoxic tank upper layer fixed-bed biofilm module 1111 and an anoxic tank lower layer fixed-bed biofilm module 1112; and two layers of fixed-bed biofilm modules are arranged in the first fixed-bed biofilm device 121 located in the aerobic tank 12, respectively denoted as: an aerobic tank upper layer fixed-bed biofilm module 1211 and an aerobic tank lower layer fixed-bed biofilm module 1212.
[0055] In the mud-membrane symbiotic sewage treatment system 1 of this embodiment, the clear liquid overflow from the secondary sedimentation tank 13 is discharged as system effluent.
[0056] In this embodiment, one end of the sludge return line 14 is located in the anoxic tank 11 (preferably at the bottom of the water inlet side of the anoxic tank 11), and the other end of the sludge return line 14 is located at the bottom of the secondary settling tank 13. A fluid conveying device (not shown) is provided within the sludge return line 14. In this embodiment, the fluid conveying device is a pump. Sludge at the bottom of the secondary settling tank 13 is returned to the anoxic tank 11 through the sludge return line 14.
[0057] In this embodiment, one end of the nitrification liquid return line 15 is located in the anoxic tank 11, and the other end of the nitrification liquid return line 15 is located at the bottom of the outlet side of the aerobic tank 12. A fluid conveying device (not shown) is provided within the nitrification liquid return line 15. In this embodiment, the fluid conveying device is a pump. The sludge mixture at the bottom of the aerobic tank 12 is returned to the anoxic tank 11 through the nitrification liquid return line 15.
[0058] Please continue to see Figure 2 In this embodiment, the anoxic tank 11, the aerobic tank 12, and the secondary sedimentation tank 13 are separated by partition walls. Sewage flows through the anoxic tank 11, the aerobic tank 12, and the secondary sedimentation tank 13 in sequence, and the clear liquid overflows and is discharged in the secondary sedimentation tank 13. The partition wall between the anoxic tank 11 and the aerobic tank 12 is provided with a flow hole, and the flow hole is provided with a water distribution pipe, the end of which leads to the bottom of the aerobic tank 12; the end of the water outlet of the aerobic tank 12 is provided with a water collection tank, and a water distribution pipe is provided at the outlet of the water collection tank to introduce water into the bottom of the secondary sedimentation tank 13; in this embodiment, the total flow rate of the sludge mixture from the aerobic tank 12 and the sludge at the bottom of the secondary sedimentation tank 13 back to the anoxic tank 11 is set to 3 times the water inlet volume.
[0059] In this embodiment, a stirring device is provided at the bottom of the anoxic tank 11 , and the stirring device is a flow pusher 112 , and the stirring device is used for stirring and mixing the sludge.
[0060] In other embodiments, a perforated pipe may be arranged in the anoxic tank 11 as a stirring device.
[0061] Specifically, the perforated pipes are evenly distributed on the bottom of the anoxic tank 11, and the sludge mixture can be stirred by continuous aeration or intermittent aeration; the flow pusher 112 is set at the outlet side of the anoxic tank 11 to push the flow toward the inlet side.
[0062] In this embodiment, an aeration device is provided at the bottom of the aerobic pool 12. The aeration device includes at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex aerator, and a nano aeration tube. The aeration device is used to provide aeration and oxygenation for the aerobic pool.
[0063] Specifically, the bottom aeration device of the aerobic tank 12 of this embodiment is a microporous aerator 122, which is set to have a strong aeration effect.
[0064] See further Figure 3The structure of the fixed-bed biofilm module will be described below using the upper fixed-bed biofilm module 1111 in the anoxic tank as an example. In this embodiment, the upper fixed-bed biofilm module 1111 includes an anoxic tank biofilm immobilization unit 11111. The anoxic tank biofilm immobilization unit 11111 includes a plurality of suspended biofilm fillers for biofilm attachment and growth. Adjacent biofilm fillers are spaced 20-500 mm apart, forming a muddy water channel. The distance between the bottom of the anoxic tank biofilm immobilization unit 11111 and the bottom of the upper fixed-bed biofilm module 1111 is set to 250-1000 mm.
[0065] In a specific embodiment, the dimensions of the upper fixed-bed biofilm module 1111 of the anoxic tank, the lower fixed-bed biofilm module 1112 of the anoxic tank, the upper fixed-bed biofilm module 1211 of the aerobic tank, and the lower fixed-bed biofilm module 1212 of the aerobic tank are all designed to be 1.0m×1.0m×1.2m (length×width×height); the biofilm fillers are arranged to be vertically suspended, and the mud and water channels formed by the filler spacing are in the vertical direction. In this embodiment, the filler spacing is set to 50mm.
[0066] In this embodiment, the distance between the bottom of the biofilm solid support unit in the upper fixed bed biofilm module 1111 of the anoxic tank and the upper fixed bed biofilm module 1211 of the aerobic tank and the bottom of the module is set to 300 mm; the distance between the bottom of the biofilm solid support unit in the lower fixed bed biofilm 1112 of the anoxic tank and the lower fixed bed biofilm module 1212 of the aerobic tank and the bottom of the module is set to 400 mm, which helps to reserve space for installing a flow pusher and an aeration device at the bottom of the pool.
[0067] In this embodiment, the biofilm filler of the biofilm solidification unit has the functions of high porosity, high biocompatibility and high adsorption performance, and is made of one or more of polyester fiber, polypropylene, polyethylene and polyurethane. The surface and interior of the filler are coated or sprayed with a hydrophilic agent and an antistatic agent. The filling rate of the filler can be set at 10-150m 2 / m 3 .
[0068] Specifically, the filling rate of the filler in this embodiment is 30m 2 / m 3 The filler absorbs and intercepts sludge in the activated sludge system to form a biofilm, which increases the biomass of the system by 2000-3000 mg / L; the biofilm contains specific domesticated functional bacteria, including Proteobacteria, Bacteroidetes, Gemmatimonadetes, Nitrosobacteria, Nitrifying bacteria and other sewage functional bacteria, which can efficiently degrade pollutants such as organic matter, ammonia nitrogen, and total nitrogen.
[0069] See further Figure 2-3In this embodiment, a first fixed-bed biofilm device 121 and a second fixed-bed biofilm device 111 are respectively set in the aerobic tank 12 and the anoxic tank 11. The biofilms fixed on the multiple fixed-bed biofilm modules and the suspended activated sludge jointly complete the removal of pollutants in the sewage. The organic matter and nitrate in the sewage are degraded in the anoxic tank 11, and the aerobic tank 12 removes ammonia nitrogen and remaining organic matter, directly increasing the organic load, ammonia nitrogen load and total nitrogen load of the biochemical system.
[0070] In this embodiment, the first fixed bed biofilm device 111 and the second fixed bed biofilm device 121 are completely identical.
[0071] Using the mud-membrane symbiotic wastewater treatment system 1 provided in this embodiment, wastewater enters the mud-membrane symbiotic wastewater treatment system 1 and is treated in the anoxic tank 11, the aerobic tank 12, and the secondary sedimentation tank 13. The system's wastewater removal effectiveness is verified by sampling and testing the main pollutants in the influent and effluent twice. Specific results are shown in Table 1. The test results show that the pollutant indicators of the wastewater treated by the mud-membrane symbiotic wastewater treatment system 1 of this embodiment consistently meet the surface water Class V standards (except for total nitrogen).
[0072] Among them, COD was detected by dichromate method;
[0073] NH3-N was detected by Nessler's reagent spectrophotometry;
[0074] TN was detected by alkaline potassium persulfate digestion and UV spectrophotometry;
[0075] SS is tested by weight method.
[0076] Table 1 Water quality of inlet and outlet water and pollutant removal effect of the sewage treatment system of this embodiment
[0077]
[0078] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.
[0081] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.
[0082] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0083] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 present invention. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring 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. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.
[0084] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, as long as these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.
[0085] The above description is a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.
Claims
1. A mud-film symbiotic sewage treatment system, characterized in that: include: Aerobic tank, first fixed bed biofilm device, sludge return pipeline and secondary sedimentation tank; The aerobic tank and the secondary sedimentation tank are connected in sequence according to the direction of water flow; one end of the sludge return pipeline is arranged at the bottom of the aerobic tank, and the other end of the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank; the aerobic tank is provided with suspended activated sludge and the first fixed bed biofilm device; the first fixed bed biofilm device includes at least one fixed bed biofilm module, the fixed bed biofilm module includes a biofilm solid support unit, the biofilm solid support unit includes a plurality of suspended and fixed biofilm fillers, and the spacing between adjacent biofilm fillers is 20-500mm to form a mud-water channel.
2. The mud-membrane symbiotic sewage treatment system according to claim 1 is characterized in that: It also includes an anoxic tank, which is connected to the aerobic tank, and the sewage passes through the anoxic tank, the aerobic tank and the secondary sedimentation tank in sequence; one end of the sludge return pipeline is arranged at the bottom of the anoxic tank, and the other end of the sludge return pipeline is arranged at the bottom of the secondary sedimentation tank; the anoxic tank is provided with suspended activated sludge and a second fixed bed biofilm device; the second fixed bed biofilm device includes at least one of the fixed bed biofilm modules.
3. The mud-membrane symbiotic sewage treatment system according to claim 1 or 2, characterized in that: A plurality of the fixed bed biofilm modules are stacked and arranged from top to bottom, and adjacent fixed bed biofilm modules are connected to each other; the distance between the biofilm immobilization unit and the bottom of the fixed bed biofilm module is 150-1000 mm.
4. The mud-membrane symbiotic sewage treatment system according to claim 2 is characterized in that: It also includes a nitrification liquid reflux pipeline, one end of which is arranged at the anoxic tank, and the other end of which is arranged at the bottom of the outlet side of the aerobic tank, wherein a fluid conveying device is arranged in the nitrification liquid reflux pipeline.
5. The mud-membrane symbiotic sewage treatment system according to claim 2 is characterized in that: The anoxic pool and the aerobic pool are separated by a partition wall. The partition wall is provided with a flow hole. A water distribution pipe is arranged in the flow hole. The water outlet of the water distribution pipe leads to the bottom of the aerobic pool.
6. The mud-membrane symbiotic sewage treatment system according to claim 1 is characterized in that: A water collecting trough is provided on one side of the aerobic tank adjacent to the secondary sedimentation tank, a water distribution pipe is provided at the outlet of the water collecting trough, and the water outlet end of the water distribution pipe leads to the bottom of the secondary sedimentation tank.
7. The mud-membrane symbiotic sewage treatment system according to claim 2 is characterized in that: The anoxic pool is provided with a stirring device, and the stirring device comprises a flow promoter and / or a perforated pipe.
8. The mud-membrane symbiotic sewage treatment system according to claim 7 is characterized in that: The flow promoter is arranged at the water outlet side of the anoxic pool, and the perforated pipe is arranged at the bottom of the anoxic pool.
9. The mud-membrane symbiotic sewage treatment system according to claim 1 is characterized in that: An aeration device is provided at the bottom of the aerobic pool.
10. The mud-membrane symbiotic sewage treatment system according to claim 9 is characterized in that: The aeration device includes at least one of a microporous aerator, a tubular aerator, a perforated tube, a vortex mixing aerator and a nano aeration tube.