A biofilm reactor for sewage treatment and use method thereof

Abstract

The present invention provides a biofilm reactor for sewage treatment and a method of use, comprising an anoxic reaction component, a pipeline connecting component, a convection reactor, and a sedimentation clarification tank; sewage enters the interior of the anoxic reaction component, enters the convection reactor through the pipeline connecting component, and the pipeline connecting component is connected with an air inlet pipe. When the water flows in the pipeline connecting component, the external air mixes with the sewage in the pipeline connecting component under the action of atmospheric pressure, and the sewage enters the siphon pipeline component through the convection reactor. When the water level in the second convection zone reaches the set water level height and stays for a period of time, as the water level continues to rise, the siphon pipeline component sucks the treated sewage into the sedimentation clarification tank for sedimentation and purification. The fluidized filler of the present application is loaded in zones, which not only has a fluidization effect, but also effectively solves the problems of easy clogging, overall aggregation and escape of fillers in the current SBBR and MBBR processes.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment, and in particular relates to a biofilm reactor for sewage treatment and a use method thereof. Background Art

[0002] With the progress of modern industry and the rapid expansion of population, water pollution has become one of the social focuses. At present, there are two main methods of sewage treatment: activated sludge method and biofilm method. Since the activated sludge method was pioneered in the UK in the early 20th century, it has developed in many ways after decades of development and innovation. At the same time, due to its excellent sewage treatment effect, it has gradually become a relatively mature process recognized by everyone; the biofilm method is a process that uses organisms attached to the filler to purify the water body, which has also been rapidly developed and improved in recent years.

[0003] From the perspective of many years of operation practice, although the activated sludge method is relatively mature, it also has many shortcomings and deficiencies, such as large aeration tank volume, high floor space, high infrastructure costs, etc. At the same time, it has low adaptability to changes in water quality and water volume, and the operation effect is easily affected by changes in water quality and water volume. In view of the above factors, this sewage treatment method was gradually replaced by the later biofilm method. The biofilm method makes up for many shortcomings of the activated sludge method, such as its good stability, strong ability to withstand organic load and hydraulic load impact, no sludge expansion, no backflow, high removal rate of organic matter, small reactor volume, and small footprint of sewage treatment plants. However, the biofilm method also has its own unique defects, such as the filter material in the biological filter is easy to clog, periodic backwashing is required, the replacement of fixed fillers and aeration equipment under the fillers is difficult, the carrier particles in the biological fluidized bed reactor can only play a role in the fluidized state, and the process stability is poor. In view of the shortcomings and deficiencies of the above two processes, the moving bed biofilm reactor (MBBR) came into being. MBBR method absorbs the advantages of both traditional activated sludge method and biological contact oxidation method and becomes a new and efficient composite process treatment method. The principle of MBBR process is to increase the biomass and biological species in the reactor by adding a certain amount of suspended carriers to the reactor, thereby improving the treatment efficiency of the reactor. Since the density of the filler is close to that of water, it is completely mixed with water during aeration, and the environment for microbial growth is gas, liquid and solid. The collision and shearing effect of the carrier in the water makes the air bubbles smaller and increases the utilization rate of oxygen. In addition, each carrier has different biological species inside and outside, some anaerobic bacteria or facultative aerobic bacteria grow inside, and good bacteria grow outside. In this way, each carrier is a microreactor, so that nitrification and denitrification reactions exist at the same time, thereby improving the treatment effect. Its core part is to directly add the suspended filler with a specific gravity close to that of water into the aeration tank as an active carrier of microorganisms, relying on the aeration in the aeration tank and the lifting effect of the water flow to be in a fluidized state. When the microorganisms are attached to the carrier, the floating carrier moves freely in the reactor with the swirling and flipping effect of the mixed liquid, thereby achieving the purpose of sewage treatment. As a process that combines the suspended growth activated sludge method and the attached growth biofilm method, the MBBR method has the advantages of both: less space - under the same load conditions, it only needs 20% of the volume of an ordinary oxidation pond; microorganisms attach to the carrier and flow with the water, so there is no need for activated sludge return or circulating backwashing; the carrier organisms continuously fall off to avoid blockage; the organic load is high and the impact load resistance is strong, so the effluent water quality is stable; the head loss is small, the power consumption is low, the operation is simple, and the operation and management are easy; it is also suitable for renovation projects.

[0004] Many engineering examples have shown that the MBBR method has a good effect in treating sewage, but the MBBR process is also prone to the following problems during operation:

[0005] 1. The fluidization state of the MBBR reactor is difficult to control;

[0006] The fillers in the reactor are in a fluidized state due to the aeration and water flow, which not only consumes a lot of electricity, but also often accumulates in some places due to uneven air distribution in the whole tank in actual operation. Therefore, it is necessary to constantly adjust the aeration volume of each aeration head according to the actual situation, which leads to unstable process operation.

[0007] 2. The problem of blockage of packing grid plate;

[0008] In order to prevent the filler from being lost with the treated water, a grid plate should be installed at the outlet of the moving bed biofilm reactor. However, the grid is prone to blockage during operation and commissioning. When the laboratory uses a perforated plastic plate as a grid, a large mass of suspended sludge blocks the outlet grid plate. Although the clogging of the grid by the filler can be prevented by strengthening the aeration of the grid in the outlet area, the adhesion problem of suspended sludge can only be solved by changing the material and spacing of the grid, which also affects the normal operation of the entire sewage treatment system.

[0009] Sequencing Biofilm Batch Reactor (SBBR) is a new sewage biological treatment process currently being studied and applied at home and abroad. Foreign research on the SBBR process mainly focuses on its treatment of toxic and difficult-to-degrade organic wastewater, and is actively studying the treatment effect of the SBBR process on urban domestic sewage. The sequencing batch fluidized bed biofilm reactor is similar to the MBBR process, and there are still problems in the operation of the MBBR process. Summary of the invention

[0010] In view of this, the present invention aims to provide a biofilm reactor for sewage treatment and a method of use to solve at least one technical problem in the background technology.

[0011] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0012] A biofilm reactor for sewage treatment comprises an anoxic reaction component, a pipeline connecting component, a convection reactor and a sedimentation clarification tank; the anoxic reaction component is connected to the convection reactor via the pipeline connecting component, and the convection reactor is connected to the sedimentation clarification tank via a siphon pipeline component; the bottom of the high-level water tank is arranged above the convection reactor, and one end of the siphon pipeline component is arranged in the convection reactor, and the other end is arranged in the sedimentation clarification tank.

[0013] A plurality of partitions are vertically arranged in the convection reactor, and the partitions divide the convection reactor into a plurality of independent convection spaces; an intermediate sealing plate is horizontally arranged in the convection reactor, and the intermediate sealing plate divides the independent convection space into a first convection zone and a second convection zone, and a connecting pipe is arranged at the bottom of the intermediate sealing plate, and the first convection zone and the second convection zone are connected through the connecting pipe, and the siphon pipe assembly is connected to the first convection zone.

[0014] The sewage enters the anoxic reaction component and enters the convection reactor through the pipe connecting component. The pipe connecting component is connected with an air inlet pipe. When the water flows in the pipe connecting component, the external air mixes with the sewage in the pipe connecting component under the action of atmospheric pressure. The sewage enters the siphon pipe component through the convection reactor. When the water level in the second convection zone reaches the set water level, the convection reactor stops taking in water. After the sewage stays for a period of time, the convection reactor continues to take in water, and the water level continues to rise until a siphon effect occurs. The siphon pipe component sucks the treated sewage into the sedimentation and clarification tank for sedimentation and purification.

[0015] Furthermore, the anoxic reaction component includes a high-level water tank; the high-level water tank is arranged on one side of the convection reactor, and the height of the high-level water tank is higher than the height of the convection reactor.

[0016] The lower part of the high-level water tank is connected with the convection reactor through a plurality of pipeline connecting components.

[0017] A water inlet pipe is arranged at the bottom of the high-level water tank, and a water inlet valve is arranged on the water inlet pipe.

[0018] A high-level drain pipe is provided at the bottom of the high-level water tank.

[0019] A first liquid level gauge for monitoring the water level is arranged inside the high-level water tank.

[0020] A first bio-rope filler assembly is provided inside the high-level water tank, and the first bio-rope filler assembly includes a first bio-rope filler frame and a first bio-rope filler. The first bio-rope filler frame is vertically arranged in the high-level water tank, and a plurality of first bio-rope fillers are evenly arranged on the first bio-rope filler frame. A baffle energy dissipation plate is vertically provided in the high-level water tank, and a plurality of evenly distributed energy dissipation holes are arranged on the baffle energy dissipation plate.

[0021] The specific surface area of ​​the first biological rope filler is ≥5000m 2 / m 3 The BOD load of the first biological rope filler is 0.5-3Kg / m 3 ·d, COD load of the first biological rope filler ≥ 1Kg / m 3 ·d. The spacing between the first biological rope fillers is 150-200mm.

[0022] Furthermore, the pipeline connecting component includes a first outlet pipe and a second outlet pipe, one end of the first outlet pipe and the second outlet pipe are both connected to the hydraulic turbine fan, the other end of the first outlet pipe is connected to the bottom of the high-level water tank, and the other end of the second outlet pipe is arranged in the first convection zone.

[0023] The first outlet pipe is L-shaped, the horizontal end of the first outlet pipe is connected to the bottom of the high-level water tank, the horizontal end of the first outlet pipe is provided with an outlet solenoid valve, and the vertical end of the first outlet pipe is connected to the hydraulic turbine fan.

[0024] The second outflow pipe is connected to a horizontal pipe arranged in the first convection zone, and a plurality of evenly distributed outflow holes are arranged on the horizontal pipe.

[0025] The horizontal end and the vertical end of the first outlet pipe are respectively communicated with the air intake pipe, and the air intake pipe is provided with an air intake electromagnetic valve.

[0026] Further, the number of independent convection spaces is the same as the number of pipeline communication components.

[0027] A first water scattering plate and a second water scattering plate are arranged in the first convection zone below the middle sealing plate of the convection reactor, and the second water scattering plate is arranged above the first water scattering plate; and a dissolved oxygen meter is arranged at the lower part of the convection reactor.

[0028] A blower aeration assembly is provided at the bottom of the convection reactor. The blower aeration assembly is arranged in the first convection zone. The blower aeration assembly comprises a blower, a main pipeline, an aeration pipeline, a microporous aeration disk and a dissolved oxygen meter.

[0029] The blower is connected to the main pipeline, and a plurality of aeration pipelines are connected to the main pipeline.

[0030] A plurality of microporous aeration plates are arranged on the aeration pipeline, and aeration holes are arranged on the microporous aeration plates.

[0031] The dissolved oxygen meter is arranged between the first water diffuser plate and the second water diffuser plate.

[0032] Furthermore, a second bio-rope filler assembly is provided inside the convection reactor, the second bio-rope filler assembly is arranged in the second convection zone, the second bio-rope filler assembly includes a second bio-rope filler frame and a second bio-rope filler, and the second bio-rope filler frame is vertically arranged in the convection reactor; a plurality of second bio-rope fillers are arranged on the second bio-rope filler frame.

[0033] The specific surface area of ​​the second biological rope filler is ≥5000m 2 / m 3 The BOD load of the second biological rope filler is 0.5-3Kg / m 3 ·d, COD load of the second biological rope filler ≥ 1Kg / m 3·d. The installation spacing of the second biological rope filler is 150-200mm.

[0034] Furthermore, a second liquid level gauge is provided inside the convection reactor, and the second liquid level gauge is arranged in the second convection zone. A pressure reducing valve is provided at the top of the convection reactor, and a reactor venting pipe is provided at the bottom of the convection reactor.

[0035] A plurality of bio-ball filler assemblies are arranged in the first convection zone of the convection reactor, and the bio-ball filler assemblies are arranged between the first water scattering plate and the second water scattering plate.

[0036] The bio-ball filler component comprises a bio-ball filler and a hollow sphere, wherein the bio-ball filler is arranged in the hollow sphere.

[0037] The total volume of the hollow spheres of the plurality of bio-ball filler assemblies is 45-65% of the space formed between the first water scattering plate and the second water scattering plate.

[0038] The shape of the filler is cube.

[0039] The total volume of the biosphere filler accounts for 25%-35% of the internal space of the hollow sphere.

[0040] The bio-ball filler of the bio-ball filler assembly is a hydrophilic polyurethane polymer high-efficiency bio-carrier particle; the hydrophilic polyurethane polymer high-efficiency bio-carrier particle filler in the hollow sphere has a specific surface area of ​​>4000m 2 / m 3 During normal operation, the density of the carrier particles after biofilm formation is 1.0 g / cm 3 -1.01g / cm 3 .

[0041] The hydrophilic polyurethane high-molecular-weight and efficient biological carrier particles contain hydrophilic gel components. When the carrier comes into contact with water, the gel absorbs water and expands. After the water absorption and expansion, the total volume of the particles occupies no more than 60% of the internal space of the hollow sphere.

[0042] Further, the number of the siphon pipe assemblies is the same as the number of the independent convection spaces.

[0043] The siphon pipe assembly includes a siphon main pipe, a vacuum pipe, and a siphon termination pipe. One end of the siphon main pipe passes through the middle sealing plate and is connected to the first convection zone. An inclined tube filler is provided at the lower part of the sedimentation and clarification tank. The other end of the siphon main pipe extends below the inclined tube filler in the sedimentation and clarification tank.

[0044] One end of the vacuum tube is connected to the top of the siphon main pipe, and the other end extends below the liquid surface in the sedimentation and clarification tank.

[0045] The siphon termination pipe is connected with the siphon main pipe, and the vacuum pipe and the siphon termination pipe are connected through a pipeline; the other end of the siphon main pipe is arranged in the second convection zone, and a siphon terminator is arranged at the end of the siphon termination pipe.

[0046] The amount of water between the siphon terminator and the highest water level set by the second liquid level gauge is less than 4 / 5 of the total water storage capacity in the first convection zone.

[0047] Furthermore, a plurality of cone-shaped parts are provided at the bottom of the sedimentation and clarification tank, and a mud discharge pipe is provided at the bottom of the cone-shaped parts.

[0048] The lower part of the sedimentation and clarification tank is provided with an inclined tube filler, and one side of the upper part of the sedimentation and clarification tank is provided with a supernatant discharge outlet.

[0049] A third liquid level gauge is provided in the sedimentation and clarification tank, and the position at which the third liquid level gauge is provided corresponds to the high liquid level of the sedimentation and clarification tank.

[0050] It also includes an intelligent control cabinet, which has a controller inside. The controller is electrically connected to the first liquid level gauge, the air inlet solenoid valve, the outlet solenoid valve, the blower aeration component, the second liquid level gauge, the pressure reducing valve, and the third liquid level gauge, and can control the hydraulic retention time, the process operation cycle, and the reaction time.

[0051] The above-mentioned method for using a biofilm reactor for sewage treatment comprises the following steps:

[0052] S1: The pretreated sewage enters the high-level water tank. When the water level in the high-level water tank reaches the upper limit of the water tank, the water inlet pipe stops inletting water and stands for a period of time. When the liquid level in the second convection zone of the convection reactor is lower than the siphon terminator, the outflow solenoid valve opens, and the sewage enters the first convection zone through the pipeline connecting component. The air inlet pipe starts to take in air, and the hydraulic turbine fan starts to rotate.

[0053] S2: When the water level of the sewage in step S1 reaches the middle sealing plate in the first convection zone, part of the sewage enters the second convection zone through the connecting pipe, and the other part of the sewage enters the siphon pipe assembly; the water level in the second convection zone and the siphon pipe assembly continues to rise, and when the water level in the second convection zone reaches the set water level, the convection reactor stops inflowing, the high-level water tank starts inflowing, and the sewage is left standing in the convection reactor;

[0054] S3: The sewage in the high-level water tank continues to enter the convection reactor, and the water level in the second convection zone continues to rise until siphon action occurs. The water inflow into the convection reactor stops, and the sewage in the second convection zone flows into the first convection zone through the connecting pipe, and flows into the sedimentation and clarification tank through the siphon pipe assembly. When the water level in the second convection zone drops below the siphon terminator, the siphon stops, and the water in the convection reactor stops flowing to the sedimentation and clarification tank. After standing, the supernatant in the sedimentation and clarification tank is directly discharged.

[0055] Furthermore, the pretreatment in step S1 includes filtering the sewage.

[0056] And / or, in step S1, the water inlet pipe is left to stand still after water inlet stops, and the standing time is at least 1 hour.

[0057] And / or, in step S2, the sewage is allowed to stand in the countercurrent reactor for 4-8 hours.

[0058] And / or, when the sewage is left standing in the convection reactor in step S2, if the dissolved oxygen in the first convection zone is lower than 3 mg / l, aeration is performed, and when the dissolved oxygen in the convection reactor reaches 6 mg / l, aeration is stopped.

[0059] And / or, the standing time in step S3 is 1-1.5 hours.

[0060] The activated sludge concentration in the first convection zone is 1500mg / L~4000mg / L.

[0061] Compared with the prior art, the biofilm reactor for sewage treatment and the use method described in the present invention have the following advantages:

[0062] 1. This application mainly relies on the gravity convection of water and siphon effect to realize the fluidization of the filler and achieve sufficient contact between the sewage and the filler. The existing process not only requires oxygenation of the water body through a blower, but more importantly, it requires all electric energy to drive the water flow through a blower aeration to achieve the fluidization of the filler. This solution consumes no other electricity except for the necessary return water pump and a small amount of electricity used by the blower for occasional supplementary aeration, which greatly reduces the energy consumption of the existing technology that relies on blowers and flow pushers to fluidize the filler.

[0063] 2. The fluidized filler of the present application is loaded in zones, which not only has a fluidizing effect, but also effectively avoids the problems of filler blockage, overall aggregation and escape, and effectively solves the problems existing in the current SBBR and MBBR processes.

[0064] 3. The present application sets an air inlet pipe on the outside of the outlet pipe. According to the Bernoulli principle, when the sewage in the outlet pipe flows to the packing reaction zone, the air will mix with the sewage, increasing the oxygen content in the water without increasing power consumption, providing an aerobic environment for microbial proliferation, and reducing the impact potential energy of the water head on the packing. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0066] Figure 1 This is a schematic diagram of the interior of a biofilm reactor for sewage treatment according to an embodiment of the present invention;

[0067] Figure 2 A schematic diagram of a blower aeration assembly of a biofilm reactor for sewage treatment according to an embodiment of the present invention;

[0068] Figure 3 This is an overall schematic diagram of a biofilm reactor for sewage treatment according to an embodiment of the present invention;

[0069] Figure 4 This is a schematic diagram of the interior of a biofilm reactor for sewage treatment according to an embodiment of the present invention;

[0070] Figure 5 This is a schematic diagram of the changes in the biofilm morphology on the filler of a biofilm reactor for sewage treatment described in Example 2 of the present invention.

[0071] Description of reference numerals:

[0072] 1. High-level water tank; 2. Pipeline connecting assembly; 3. Convection reactor; 4. Sedimentation and clarification tank; 5. Baffle; 6. Intermediate sealing plate; 7. First convection zone; 8. Second convection zone; 9. Connecting pipe; 10. Air inlet pipe; 11. Intelligent control cabinet; 12. Water inlet pipe; 13. Water inlet valve; 14. High-level vent pipe; 15. First biological rope filler rack; 16. First biological rope filler; 17. Baffle energy dissipation plate; 18. First liquid level gauge; 19. First outlet pipe; 20. Second outlet pipe; 21. Hydraulic turbine fan; 22. Outflow hole; 23. Inlet electromagnetic valve; 24. Outflow electromagnetic valve; 25. Blower aeration assembly; 251. Blower; 252. Main pipeline ; 253, aeration pipe; 254, microporous aeration plate; 26, dissolved oxygen meter; 27, first water diffuser; 28, second water diffuser; 29, second biological rope filler rack; 30, second biological rope filler; 31, second liquid level gauge; 32, pressure reducing valve; 33, biological ball filler assembly; 34, reactor vent pipe; 35, siphon main pipe; 36, vacuum pipe; 37, siphon termination pipe; 38, clean water area; 39, cone; 40, mud discharge pipe; 41, third liquid level gauge; 42, siphon terminator; 43, inclined tube filler; 44, supernatant discharge port; 45, water tank liquid level upper limit; 46, first water level; 47, second water level; 48, high liquid level; 49, low liquid level. DETAILED DESCRIPTION

[0073] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0074] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0076] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0077] Example 1

[0078] like Figure 1 , 3 As shown in , a biofilm reactor for sewage treatment, comprising an anoxic reaction component, a pipe connecting component 2, a convection reactor 3, and a sedimentation clarification tank 4; the anoxic reaction component is connected to the convection reactor 3 through the pipe connecting component 2, and the convection reactor 3 is connected to the sedimentation clarification tank 4 through the siphon pipe component; the bottom of the high-level water tank 1 is arranged above the convection reactor 3, and one end of the siphon pipe component is arranged in the convection reactor 3, and the other end is arranged in the sedimentation clarification tank 4; a plurality of partitions 5 are vertically arranged in the convection reactor 3, and the partitions 5 divide the convection reactor 3 into a plurality of independent convection spaces; an intermediate sealing plate 6 is horizontally arranged in the convection reactor 3, and the intermediate sealing plate 6 divides the independent convection space into a first convection zone 7 and a second convection zone 8, and a connecting pipe 9 is arranged at the bottom of the intermediate sealing plate 6, the first convection zone 7 and the second convection zone 8 are connected through the connecting pipe 9, and the siphon pipe component is connected to the first convection zone.

[0079] The sewage enters the anoxic reaction component and enters the convection reactor 3 through the pipe connecting component 2. The pipe connecting component 2 is connected with an air inlet pipe 10. When the water flows in the pipe connecting component 2, the external air mixes with the sewage in the pipe connecting component 2 under the action of atmospheric pressure. The sewage enters the siphon pipe component through the convection reactor 3. When the water level in the second convection zone 8 reaches the set water level, the convection reactor 3 stops taking in water. After the sewage stays for a period of time, the convection reactor 3 continues to take in water, and the water level continues to rise until a siphon effect occurs. The siphon pipe component sucks the treated sewage into the sedimentation and clarification tank 4 for sedimentation and purification.

[0080] The anoxic reaction component includes a high-level water tank 1, which is arranged on one side of the convection reactor 3, and the height of the high-level water tank 1 is higher than the height of the convection reactor 3; the lower part of the high-level water tank 1 is connected to the convection reactor 3 through a plurality of pipeline connecting components 2; a water inlet pipe 12 is provided at the bottom of the high-level water tank 1, and a water inlet valve 13 is provided on the water inlet pipe 12; a high-level vent pipe 14 is provided at the bottom of the high-level water tank 1; a first liquid level gauge 18 for monitoring the water level is provided inside the high-level water tank 1; a first bio-rope filler component is provided inside the high-level water tank 1, and the first bio-rope filler component includes a first bio-rope filler frame 15 and a first bio-rope filler 16, the first bio-rope filler frame 15 is vertically arranged in the high-level water tank 1, and a plurality of first bio-rope fillers 16 are evenly arranged on the first bio-rope filler frame 15.

[0081] A baffle plate 17 is vertically arranged in the high-level water tank 1, and a plurality of evenly distributed energy dissipation holes are arranged on the baffle plate 17.

[0082] The specific surface area of ​​the first biological rope filler 16 is ≥5000m 2 / m 3 The BOD load of the first biological rope filler 16 is 0.5-3Kg / m 3 ·d. COD load of the first biological rope filler 16 ≥ 1Kg / m 3 ·d. The spacing between the first biological rope fillers 16 is 150-200 mm.

[0083] The pipeline connecting component 2 includes a first outlet pipe 19 and a second outlet pipe 20; one end of the first outlet pipe 19 and the second outlet pipe 20 are both connected to the hydraulic turbine fan 21; the other end of the first outlet pipe 19 is connected to the bottom of the high-level water tank 1, and the other end of the second outlet pipe 20 is arranged in the first convection zone 7.

[0084] The first outlet pipe 19 is L-shaped, and the horizontal end of the first outlet pipe 19 is connected to the bottom of the high-level water tank 1. The horizontal end of the first outlet pipe 19 is provided with an outflow solenoid valve 24, and the vertical end of the first outlet pipe 19 is connected to the hydraulic turbine fan 21; the second outlet pipe 20 is connected to a horizontal pipe arranged in the first convection zone 7, and a plurality of evenly distributed outflow holes 22 are provided on the horizontal pipe; the horizontal end and the vertical end of the first outlet pipe 19 are respectively connected to the air inlet pipe 10, and the air inlet pipe 10 is provided with an air inlet solenoid valve 23.

[0085] The number of independent convection spaces is the same as the number of pipeline connecting components 2; a first water scattering plate 27 and a second water scattering plate 28 are provided in the first convection zone 7 below the middle sealing plate 6 of the convection reactor 3, and the second water scattering plate 28 is arranged above the first water scattering plate 27; and a dissolved oxygen meter 26 is arranged at the lower part of the convection reactor 3.

[0086] like Figure 2 As shown, a blower aeration assembly 25 is provided at the bottom of the convection reactor 3, and the blower aeration assembly 25 is arranged in the first convection zone 7. The blower aeration assembly 25 includes a blower 251, a main pipeline 252, an aeration pipeline 253, a microporous aeration disk 254, and a dissolved oxygen meter 26; the blower 251 is connected to the main pipeline 252, and a plurality of aeration pipelines 253 are connected to the main pipeline 252; a plurality of microporous aeration disks 254 are provided on the aeration pipeline 253, and aeration holes are provided on the microporous aeration disks 254; the dissolved oxygen meter 26 is arranged between the first diffuser plate 27 and the second diffuser plate 28.

[0087] A second bio-rope filler assembly is provided inside the convection reactor 3, and the second bio-rope filler assembly is arranged in the second convection zone 8. The second bio-rope filler assembly includes a second bio-rope filler frame 29 and a second bio-rope filler 30. The second bio-rope filler frame 29 is vertically arranged in the convection reactor 3, and a plurality of second bio-rope fillers 30 are arranged on the second bio-rope filler frame 29.

[0088] Second biological rope filler 30 specific surface area ≥5000m 2 / m 3 The BOD load of the second biological rope filler 30 is 0.5-3Kg / m 3 ·d. COD load of the second biological rope filler 30 ≥ 1Kg / m 3 ·d. The installation spacing of the second biological rope filler 30 is 150-200 mm.

[0089] A second level gauge 31 for monitoring the water level is provided inside the convection reactor 3, and the second level gauge 31 is arranged in the second convection zone 8; a pressure reducing valve 32 is provided on the upper part of the convection reactor 3, and a reactor venting pipe 34 is provided at the bottom of the convection reactor 3; a plurality of bio-ball filler assemblies 33 are provided in the first convection zone 7 of the convection reactor 3, and the bio-ball filler assemblies 33 are arranged between the first water scattering plate 27 and the second water scattering plate 28; the bio-ball filler assemblies 33 include bio-ball fillers and hollow spheres, and the bio-ball fillers are arranged in the hollow spheres; the total volume of the hollow spheres of the plurality of bio-ball filler assemblies is 45%-65% of the space formed between the first water scattering plate 27 and the second water scattering plate 28. The total volume of the bio-ball fillers accounts for 25%-35% of the internal space of the hollow spheres.

[0090] The shape of the filler is a cube; the bio-ball filler of the bio-ball filler assembly 33 is a hydrophilic polyurethane polymer high-efficiency bio-carrier particle; the hydrophilic polyurethane polymer high-efficiency bio-carrier particle filler in the hollow sphere has a specific surface area of ​​>4000m 2 / m 3 During normal operation, the density of the carrier particles after biofilm formation is 1.0 g / cm 3 -1.01g / cm 3 The hydrophilic polyurethane high-molecular-weight biological carrier particles contain hydrophilic gel components. When the carrier comes into contact with water, the gel absorbs water and expands. After the water absorption and expansion, the total volume of the particles occupies no more than 60% of the internal space of the hollow sphere.

[0091] The number of siphon pipe assemblies is the same as the number of independent convection spaces; the siphon pipe assembly includes a siphon main pipe 35, a vacuum pipe 36, and a siphon termination pipe 37; one end of the siphon main pipe 35 passes through the middle sealing plate 6 and is connected to the first convection zone, an inclined tube filler 43 is provided at the lower part of the sedimentation and clarification tank 4, and the other end of the siphon main pipe 35 extends below the inclined tube filler 43 in the sedimentation and clarification tank 4; one end of the vacuum pipe 36 is connected to the top of the siphon main pipe 35, and the other end extends below the liquid level in the sedimentation and clarification tank 4; the siphon termination pipe 37 is connected to the siphon main pipe 35, and the vacuum pipe 36 and the siphon termination pipe 37 are connected through a pipeline; the other end of the siphon main pipe 35 is arranged in the second convection zone 8, and a siphon terminator 42 is provided at the end of the siphon termination pipe 37; the amount of water between the siphon terminator 42 and the highest water level set by the second liquid level gauge 31 is less than 4 / 5 of the total water storage capacity in the first convection zone 7.

[0092] A plurality of conical parts 39 are provided at the bottom of the sedimentation and clarification tank 4, and a mud discharge pipe 40 is provided at the bottom of the conical part 39; an inclined tube filler 43 is provided at the lower part of the sedimentation and clarification tank 4, and a supernatant discharge port 44 is provided at one side of the upper part of the sedimentation and clarification tank 4; a third liquid level gauge 41 is provided in the sedimentation and clarification tank 4, and the position of the third liquid level gauge 41 corresponds to the high liquid level 48 of the sedimentation and clarification tank 4 (the high liquid level 48 is provided above the supernatant discharge port 44).

[0093] It also includes an intelligent control cabinet 11, which is equipped with a controller. The controller is electrically connected to the first liquid level meter 18, the air inlet solenoid valve 23, the outlet solenoid valve 24, the blower aeration assembly 25, the second liquid level meter 31, the pressure reducing valve 32, and the third liquid level meter 41. The controller can control the hydraulic retention time, the process operation cycle and the reaction time, and the controller adopts the existing PLC technology.

[0094] The above-mentioned method for using a biofilm reactor for sewage treatment comprises the following steps:

[0095] S1: The pretreated sewage enters the high-level water tank 1. When the water level in the high-level water tank 1 reaches the upper limit 45 of the water tank liquid level, the water inlet pipe 12 stops inletting water and stands for a period of time; when the liquid level in the second convection zone 8 of the convection reactor 3 is lower than the siphon terminator 42, the outflow solenoid valve 24 opens, and the sewage enters the first convection zone 7 through the pipeline connecting component 2, the air inlet pipe 10 starts to inlet air, and the hydraulic turbine fan 21 starts to rotate;

[0096] S2: When the water level of the sewage in the first convection zone 7 reaches the middle sealing plate 6 in step S1, part of the sewage enters the second convection zone 8 through the connecting pipe 9, and the other part of the sewage enters the siphon pipe assembly; the water level in the second convection zone 8 and the siphon pipe assembly continues to rise, and when the water level in the second convection zone 8 reaches the set water level, the convection reactor 3 stops inflowing water, the high-level water tank 1 starts inflowing water, and the sewage is left standing in the convection reactor 3;

[0097] S3: The sewage in the high-level water tank 1 continues to flow into the convection reactor 3, and the water level in the second convection zone 8 continues to rise until a siphon effect occurs. The water inflow into the convection reactor 3 stops, and the sewage in the second convection zone 8 flows into the first convection zone 7 through the connecting pipe 9, and flows into the sedimentation and clarification tank 4 through the siphon pipe assembly. When the water level in the second convection zone 8 drops below the siphon terminator 42, the siphon stops, and the water in the convection reactor 3 stops flowing to the sedimentation and clarification tank 4. After standing, the supernatant in the sedimentation and clarification tank 4 is directly discharged.

[0098] The pretreatment in step S1 includes filtering the sewage; in step S1, the water inlet pipe 12 is allowed to stand still after the water inlet stops, and the standing time is at least 1 hour; in step S2, the sewage is allowed to stand in the convection reactor 3 for 4-8 hours; when the sewage is allowed to stand in the convection reactor 3 in step S2, if the dissolved oxygen in the first convection zone 7 is lower than 3 mg / l, aeration is performed, and when the dissolved oxygen in the convection reactor reaches 6 mg / l, aeration is stopped; in step S3, the standing time is 1-1.5 hours; the activated sludge concentration in the first convection zone 7 is 1500 mg / L~4000 mg / L.

[0099] In view of this, for small sewage treatment plants, the Bernoulli principle and the siphon principle are used in the process to achieve auxiliary oxygenation and full fluidization of the filler through physical action, thereby reducing the difficulty of operation and maintenance, achieving full contact between sewage and filler, and further reducing energy consumption.

[0100] Implementation steps:

[0101] The sewage after pretreatment (pretreatment is to use fence filtration) enters the high-level water tank 1 through the water inlet pipe 12. When the water level in the high-level water tank 1 reaches the upper limit of the water tank level 45, the water inlet is stopped, and the first liquid level meter 18 transmits the signal to the intelligent control cabinet 11 (using the existing PLC technology). After standing for a period of time T1 (≥1h), and when the liquid level in the second convection zone 8 of the convection reactor 3 is lower than the second water level 47, the outflow solenoid valve 24 is opened, and the sewage enters the pipeline connection component. When the water flows in the pipeline connection component 2, according to the Bernoulli principle, the pressure is small where the flow rate is large. At this time, the external air will enter the first outflow pipe 19 under the action of atmospheric pressure and mix with the sewage in the pipeline connection component 2. The hydraulic turbine of the hydraulic turbine fan 21 has a gear ratio of 1:12 to the fan turbine, and the fan turbine speed is not less than 650r / min. The turbine blades rotate under the impetus of the water flow, and while cutting the bubbles sucked in by the air inlet pipe 10, they drive the outer turbine to rotate synchronously. The rotation of the turbine generates a vacuum negative pressure, which pushes the air into the second outlet pipe 20 again and mixes with the sewage in the pipeline connecting component 2. The sewage continues to flow in the first outlet pipe 19 and the second outlet pipe 20. The sewage is evenly spread into the first convection area 7 through the outlet hole 22. At this time, the sewage passes through the second water dispersion plate 28, the second biological rope filler component, and the first water dispersion plate 27 in sequence under the action of gravity. As the water level of the first convection area 7 continues to rise, when it reaches the middle sealing plate 6, part of the sewage enters the second convection area 8 through the connecting pipe 9, and the other part of the sewage enters the siphon main pipe 35. At this time, the inflow continues to increase, and the water level in the second convection zone 8 and the siphon main pipe 35 continues to rise. When the water level in the second convection zone 8 submerges the upper surface of the second biological rope filler assembly and reaches the set water level (the first water level 46), the second liquid level meter 31 transmits a signal to the controller in the intelligent control cabinet 11, the outflow solenoid valve 24 is closed, and the water inlet pipe 12 of the high-level water tank 1 enters. At the same time, the sewage stays in the convection reactor 3 for a period of time T2 (4-8h). At this time, the dissolved oxygen meter 26 in the first convection zone 7 transmits the reading information to the controller in the intelligent control cabinet 11. If the dissolved oxygen in the first convection zone 7 is lower than 3mg / l, the blower 251 is started for aeration. When the dissolved oxygen in the convection reactor reaches 6mg / l, the blower 251 is turned off. After the time reaches T2 (4-8h), the outflow solenoid valve 24 is opened, and the water level in the second convection zone 8 continues to rise. When the water level cannot continue to rise under the action of air pressure, the sewage flows into the siphon main pipe 35 in one direction. When the water level in the siphon main pipe 35 reaches the pipe opening of the vacuum pipe 36, the water flow in the siphon main pipe 35 flows into the sedimentation and clarification tank 4 through the vacuum pipe 36, and the air in the siphon main pipe 35 is taken out at the same time. Because the end of the siphon main pipe 35 is located below the low liquid level 49 of the sedimentation and clarification tank 4 (the low liquid level 49 is set below the supernatant discharge port 44 and above the inclined tube filler 43), negative pressure is formed inside the siphon main pipe 35, and the water level in the pipe gradually rises until it fills the entire pipe body.At this time, the siphon phenomenon occurs, and the sewage flows into the sedimentation and clarification tank 4 through the siphon main pipe 35. At the same time, the outflow solenoid valve 24 is closed. At this time, the water in the second convection zone 8 flows into the first convection zone 7 through the connecting pipe 9 under the action of air pressure, siphon effect and its own gravity, and flows upward from the first convection zone 7 through the first diffuser plate 27, through the bio-ball filler assembly 33 and the second diffuser plate 28, and flows into the sedimentation and clarification tank 4 through the siphon main pipe 35.

[0102] At this time, the water in the second bio-rope filler assembly and the bio-ball filler assembly 33 forms a turbulent state under the action of the siphon water flow, the suspended filler of the second bio-rope filler assembly shakes, the bio-ball filler assembly 33 rotates and rolls, and the fillers of the second bio-rope filler assembly and the bio-ball filler assembly 33 can fully contact the sewage for a second time and flush away the aged biofilm. When the water level in the second convection zone 8 drops below the siphon terminator 42, the air is sucked into the siphon main pipe 35, and the siphon stops. The water in the convection reactor 3 stops flowing to the sedimentation and clarification tank 4.

[0103] The water flowing into the sedimentation and clarification tank 4 through the siphon main pipe 35 is precipitated in the inclined tube for T3 (1-1.5h), and the supernatant is discharged through the supernatant discharge port 44 to achieve standard discharge.

[0104] A first biological rope filler assembly is provided in the high-level water tank 1, which can enhance the anaerobic reaction.

[0105] In addition, due to the air pressure generated by aeration in the first convection zone 7, a part of the liquid enters the upper second convection zone 8 through the connecting pipe 9 as aerobic pool nitrification liquid for denitrification. Therefore, the water body of the second convection zone 8 only has a small part of air brought in through the first outlet pipe 19 and the second outlet pipe 20 and a small part of aerobic nitrification liquid pressed in under the action of aeration pressure, and the dissolved oxygen content is between the dissolved oxygen content of the high-level water tank 1 and the dissolved oxygen content of the first convection zone 7 of the bio-ball filler assembly 33, so as to play an anoxic denitrification role.

[0106] Example 2

[0107] A pilot plant uses real rural domestic sewage in North China. The parameters of the biological rope filler used in the high-level water tank 1 are: the specific surface area of ​​the first biological rope filler 16 is ≥5000m 2 / m 3 The BOD load of the first biological rope filler 16 is 0.5-3Kg / m 3 ·d. COD load of the first biological rope filler 16 ≥ 1Kg / m 3 ·d. The spacing between the first biological rope fillers 16 is 200 mm.

[0108] Second biological rope filler 30 specific surface area ≥5000m 2 / m3 , the BOD load of the second bio-rope filler 30 is 0.5-3Kgm 3 ·d, COD load of the second biological rope filler 30 ≥ 1Kgm 3 ·d. The installation spacing of the second biological rope filler 30 is 200 mm.

[0109] The total volume of the hollow sphere of the bio-ball filler assembly 33 is 45% of the space formed between the first water-spreading plate 27 and the second water-spreading plate 28. The total volume of the hydrophilic polyurethane high-efficiency biological carrier particles in the bio-ball accounts for 30% of the internal space of the bio-ball, and the total volume of the particles after water absorption, expansion and biofilm formation accounts for about 50% of the internal space of the bio-ball.

[0110] The influent COD is 272.06mg / L-325.17mg / L, ammonia nitrogen is 21.6 mg / L-30.3mg / L, and total nitrogen is 25.3mg / L-37.9mg / L. The daily processing capacity of the device is 8m 3 / d.

[0111] The biofilm formation was started by inoculation biofilm formation method. The sludge was taken from aerobic activated sludge and anaerobic activated sludge of a nearby rural sewage treatment station and added into the first convection reactor 3 equipped with bio-ball filler assembly 33 and the high-level water tank 1 equipped with the first bio-rope filler assembly at a concentration of 3500 mg / L.

[0112] First, enter the aeration and biofilm formation stage. At the beginning, the high-level water tank 1 and the convection reactor 3 are aerated simultaneously, and the dissolved oxygen is controlled between 3 and 5 mg / L. After 2 days, the aeration volume of the high-level water tank 1 is gradually reduced to control the dissolved oxygen to about 0.5 mg / L, and denitrifying bacteria are gradually cultivated.

[0113] After one day of stagnation, water was changed. To maintain the amount of inoculated sludge, the water change rate was 50% per cycle, 2 cycles per day, and 12 hours per cycle. On the 8th day, the COD and ammonia nitrogen removal rates of the reaction system were stabilized at more than 60%, and the system entered the normal inlet and outlet water operation stage.

[0114] The pretreated sewage enters the high-level water tank 1 through the water inlet pipe 12. When the water level in the high-level water tank 1 reaches the upper limit 45 of the water tank liquid level, the water inlet is stopped, and the first liquid level meter 18 transmits the signal to the controller in the intelligent control cabinet 11, and it is left to stand for a period of time (T1=1h). When the liquid level in the second convection zone 8 of the convection reactor 3 is lower than the second water level 47, the outflow solenoid valve 24 is opened, and the sewage enters the first outflow pipe 19. The first outflow pipe 19 and the second outflow pipe 20 are connected to the high-level water tank 1. The horizontal end and the vertical end of the first outflow pipe 19 are both connected to the air inlet pipe. The Bernoulli principle is used to allow external air to enter the first outflow pipe 19 under the action of atmospheric pressure and mix with the sewage. A hydraulic turbine fan 21 is provided, and the turbine blades of the hydraulic turbine fan 21 rotate under the impetus of the water flow, and while cutting the bubbles sucked in by the air inlet pipe 10, the outer turbine is driven to rotate synchronously, and the rotation of the turbine generates a vacuum negative pressure, and the air is pushed into the second outlet pipe 20 again and mixed with the sewage in the pipeline connecting component 2. The hydraulic turbine fan 21 adopts the existing technology.

[0115] The sewage continues to flow in the second outlet pipe 20. By providing a plurality of outlet holes 22 in the horizontal pipe, the sewage is evenly spread to the first convection zone 7 in a pick flow manner. At this time, the sewage passes through the second water dispersion plate 28, the bio-ball filler assembly 33, and the first water dispersion plate 27 in sequence under the action of gravity. As the water level in the first convection zone 7 continues to rise, when it reaches the middle sealing plate 6, part of the sewage enters the second convection zone 8 through the connecting pipe 9, and the other part of the sewage enters the siphon main pipe 35. At this time, the inflow continues to increase, and the water level in the second convection zone 8 and the siphon main pipe 35 continues to rise. When the water level in the second convection zone 8 submerges the upper surface of the second biological rope filler assembly and reaches the set first water level 46 (the first water level 46 is set 20CM above the upper surface of the convection reactor 3), the second liquid level meter 31 transmits a signal to the controller in the intelligent control cabinet 11, the outflow solenoid valve 24 is closed, and the water inlet pipe 12 of the high-level water tank 1 starts to take in water. At the same time, the sewage stays in the convection reactor 3 for a period of time (T2=6h). At this time, the dissolved oxygen meter 26 in the first convection zone 7 (the dissolved oxygen meter 26 adopts the existing technology) transmits the reading information to the controller in the intelligent control cabinet 11. If the dissolved oxygen in the first convection zone 7 is lower than 3mg / l, the blower 251 is started for aeration. When the dissolved oxygen in the convection reactor reaches 6mg / l, the blower 251 is turned off. After the time reaches T2=6h, the outflow solenoid valve 24 is opened, and the water level in the second convection zone 8 continues to rise. When the water level cannot continue to rise under the action of air pressure, the sewage flows into the siphon main pipe 35 in one direction. When the water level in the pipe reaches the pipe mouth of the vacuum pipe 36, the water flow in the siphon main pipe 35 flows into the sedimentation and clarification tank 4 through the vacuum pipe 36, and the air in the siphon main pipe 35 is taken out at the same time. Because the water outlet of the siphon main pipe 35 is located below the low liquid level 49 of the sedimentation and clarification tank 4, a negative pressure is formed inside the siphon main pipe 35, and the water level in the pipe gradually rises until it fills the entire pipe body of the siphon main pipe 35. At this time, the siphon phenomenon occurs, and the sewage flows into the sedimentation and clarification tank 4 through the siphon main pipe 35. At the same time, the outflow solenoid valve 24 is closed. At this time, the water in the second convection zone 8 flows into the first convection zone 7 through the connecting pipe 9 under the action of air pressure, siphon effect and its own gravity, and flows upward from the first convection zone 7 through the first diffuser plate 27, through the reaction zone of the bioball filler assembly 33 and the second diffuser plate 28, and flows into the sedimentation and clarification tank 4 through the siphon main pipe 35.

[0116] At this time, the bio-ball filler assembly 33 in the first convection zone 7 forms a turbulent state with the water in the bio-ball filler assembly 33 under the action of the siphon water flow, the second bio-rope filler 30 shakes, the bio-ball filler assembly 33 rotates and rolls passively continuously, and the filler of the bio-ball filler assembly 33 fully contacts the sewage for the second time, while flushing away the aged biofilm. When the water level in the second convection zone 8 drops below the siphon terminator 42, the air is sucked into the siphon main pipe 35, and the siphon stops. The water in the convection reactor 3 stops flowing to the sedimentation and clarification tank 4.

[0117] After the water flowing into the sedimentation and clarification tank 4 through the siphon main pipe 35 is precipitated in the inclined tube for T3=1h, the supernatant is discharged through the supernatant discharge port 44 to achieve standard discharge.

[0118] Changes in biofilm morphology on the filler, such as Figure 5 As shown:

[0119] After 2 days of exposure, a large amount of light yellow biofilm was attached to the second bio-rope filler 30 in the second convection zone 8. On the 8th day, the biofilm attached to the surface of the second bio-rope filler 30 turned into yellow-brown, and the inside was slightly black. From the 9th day to the 35th day, the amount of biofilm attached to the second bio-rope filler 30 increased, and at the same time, the black part of the biofilm attached to the filler increased. From the 36th day to the 48th day, the black part of the biofilm surface of the second bio-rope filler 30 slowly turned into dark brown. On the 49th day, the surface of the second bio-rope filler 30 showed a thin layer of yellow-brown biofilm, and the inside was black biofilm, and the color tended to be stable.

[0120] After 2 days of exposure, the carrier particles in the bioball filler assembly 33 of the first convection reactor 3 were uniformly light yellow. From the 4th day, the amount of biofilm attached to the inside of the bioball filler increased, and the color gradually deepened. Until the 10th day, the biofilm attached to the bioball filler was still mainly yellow. On the 11th day, the color of the biofilm on the surface of the bioball filler began to change to yellow-brown. On the 19th day, the biofilm on the surface of the bioball filler had turned dark brown. On the 32nd day, the color of the biofilm on the surface of the bioball filler began to change from dark brown to yellow-brown. From the 33rd day to the 42nd day, the amount of biofilm attached to the bioball filler increased, and the color of the biofilm on the surface of the bioball filler was mainly yellow-brown, and the color tended to be stable.

[0121] After 3 days of exposure, the surface of the filler in the high-level water tank 1 reactor equipped with the first biological rope filler 16 was light gray. From the 3rd day to the 15th day, the amount of biofilm attached to the first biological rope filler 16 increased, mainly gray, and partially black. On the 16th day, the outside of the first biological rope filler 16 was dark gray and the inside was black. From the 17th day to the 39th day, the amount of biofilm attached to the first biological rope filler 16 increased, and at the same time, the surface of the biofilm attached to the first biological rope filler 16 changed from dark gray to dark brown, and the color tended to be stable.

[0122] After nearly 6 months of operation, excluding the initial biofilm start-up phase, the plant has been operating normally and continuously for 143 days, treating a total of 860m3 of sewage. 3, consuming 779KWh of electricity, equivalent to 0.91 KWh / ton, which is 33.82% lower than the existing process of 1.375 KWh / ton. The effluent COD test value is 21.35mg / l-41.43 mg / l, and the COD removal rate is 86.33%-92.76%; the effluent total nitrogen test value is 11.12 mg / l-17.95 mg / l, and the total nitrogen removal rate is 52.63%-56.68%; the effluent ammonia nitrogen test value is 5.57 mg / l-7.92 mg / l, and the ammonia nitrogen removal rate is 73.42%-76.65%. All can meet national and local emission standards.

[0123] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A biofilm reactor for sewage treatment, characterized in that: The invention comprises an anoxic reaction component, a pipeline connecting component, a convection reactor, and a sedimentation clarification tank; the anoxic reaction component is connected to the convection reactor through the pipeline connecting component, and the convection reactor is connected to the sedimentation clarification tank through the siphon pipeline component; the bottom of the high-level water tank is arranged above the convection reactor, and one end of the siphon pipeline component is arranged in the convection reactor, and the other end is arranged in the sedimentation clarification tank; the anoxic reaction component comprises a high-level water tank; the high-level water tank is arranged on one side of the convection reactor, and the height of the high-level water tank is higher than the height of the convection reactor; A plurality of partitions are vertically arranged in the convection reactor, and the partitions divide the convection reactor into a plurality of independent convection spaces; an intermediate sealing plate is horizontally arranged in the convection reactor, and the intermediate sealing plate divides the independent convection space into a first convection zone and a second convection zone, the upper part is the second convection zone, and the lower part is the first convection zone; a connecting pipe is arranged at the bottom of the intermediate sealing plate, and the first convection zone and the second convection zone are connected through the connecting pipe, and the siphon pipe assembly is connected with the first convection zone; The sewage enters the anoxic reaction component and enters the convection reactor through the pipe connecting component. The pipe connecting component is connected with an air inlet pipe. When the water flows in the pipe connecting component, the external air mixes with the sewage in the pipe connecting component under the action of atmospheric pressure. The sewage enters the siphon pipe component through the convection reactor. When the water level in the second convection zone reaches the set water level, the convection reactor stops taking in water. After the sewage stays for a period of time, the convection reactor continues to take in water, and the water level continues to rise until a siphon effect occurs. The siphon pipe component sucks the treated sewage into the sedimentation and clarification tank for sedimentation and purification.

2. A biofilm reactor for sewage treatment according to claim 1, characterized in that: The lower part of the high-level water tank is connected to the convection reactor through a plurality of pipeline connecting components; A water inlet pipe is provided at the bottom of the high-level water tank, and a water inlet valve is provided on the water inlet pipe; A high-level drain pipe is provided at the bottom of the high-level water tank; A first liquid level gauge for monitoring the water level is provided inside the high-level water tank; A first biological rope filler assembly is provided inside the high-level water tank, and the first biological rope filler assembly includes a first biological rope filler frame and a first biological rope filler. A plurality of first biological rope fillers are evenly arranged on the first biological rope filler frame, and the first biological rope filler frame is vertically arranged in the high-level water tank. A baffle energy dissipation plate is vertically arranged in the high-level water tank, and a plurality of evenly distributed energy dissipation holes are arranged on the baffle energy dissipation plate. The specific surface area of ​​the first biological rope filler is ≥5000m 2 / m 3 The BOD load of the first biological rope filler is 0.5-3Kg / m 3 ·d, COD load of the first biological rope filler ≥ 1Kg / m 3 ·d. The spacing between the first biological rope fillers is 150-200mm.

3. A biofilm reactor for sewage treatment according to claim 1, characterized in that: The pipeline connecting component includes a first outlet pipe and a second outlet pipe; One end of the first outlet pipe and the second outlet pipe are both connected to the hydraulic turbine fan, the other end of the first outlet pipe is connected to the bottom of the high-level water tank, and the other end of the second outlet pipe is arranged in the first convection area; The first outlet pipe is L-shaped, the horizontal end of the first outlet pipe is connected to the bottom of the high-level water tank, the horizontal end of the first outlet pipe is provided with an outlet solenoid valve, and the vertical end of the first outlet pipe is connected to the hydraulic turbine fan; The second outflow pipe is connected to a horizontal pipe arranged in the first convection zone, and a plurality of evenly distributed outflow holes are arranged on the horizontal pipe; The horizontal end and the vertical end of the first outlet pipe are respectively communicated with the air intake pipe, and the air intake pipe is provided with an air intake electromagnetic valve.

4. A biofilm reactor for sewage treatment according to claim 3, characterized in that: The number of independent convection spaces is the same as the number of duct-connected components; A first water scattering plate and a second water scattering plate are arranged in the first convection zone below the middle sealing plate of the convection reactor, and the second water scattering plate is arranged above the first water scattering plate; a dissolved oxygen meter is arranged at the lower part of the convection reactor; A blower aeration assembly is provided at the bottom of the convection reactor, and the blower aeration assembly is arranged in the first convection zone. The blower aeration assembly includes a blower, a main pipeline, an aeration pipeline, a microporous aeration disk, and a dissolved oxygen meter; The blower is connected to the main pipeline, and a number of aeration pipelines are connected to the main pipeline; A plurality of microporous aeration disks are arranged on the aeration pipeline, and aeration holes are arranged on the microporous aeration disks; The dissolved oxygen meter is arranged between the first water diffuser plate and the second water diffuser plate.

5. A biofilm reactor for sewage treatment according to claim 4, characterized in that: A second bio-rope filler assembly is provided inside the convection reactor, the second bio-rope filler assembly is arranged in the second convection zone, the second bio-rope filler assembly includes a second bio-rope filler frame and a second bio-rope filler, the second bio-rope filler frame is vertically arranged in the convection reactor, and a plurality of second bio-rope fillers are arranged on the second bio-rope filler frame; The specific surface area of ​​the second biological rope filler is ≥5000m 2 / m 3 The BOD load of the second biological rope filler is 0.5-3Kg / m 3 ·d, COD load of the second biological rope filler ≥ 1Kg / m 3 ·d. The installation spacing of the second biological rope filler is 150-200mm.

6. A biofilm reactor for sewage treatment according to claim 5, characterized in that: A second liquid level gauge is provided inside the convection reactor, and the second liquid level gauge is arranged in the second convection zone; A pressure reducing valve is provided at the top of the convection reactor, and a reactor venting pipe is provided at the bottom of the convection reactor; A plurality of bio-ball filler assemblies are arranged in the first convection zone of the convection reactor, and the bio-ball filler assemblies are arranged between the first water scattering plate and the second water scattering plate; The bio-ball filler assembly comprises a bio-ball filler and a hollow sphere, wherein the bio-ball filler is arranged in the hollow sphere; The total volume of the hollow spheres of the several bio-ball filler assemblies is 45%-65% of the space formed between the first water scattering plate and the second water scattering plate; the total volume of the bio-ball filler accounts for 25%-35% of the internal space of the hollow sphere; The shape of the filler is a cube; The bio-ball filler of the bio-ball filler assembly is a hydrophilic polyurethane polymer high-efficiency bio-carrier particle; the hydrophilic polyurethane polymer high-efficiency bio-carrier particle filler in the hollow sphere has a specific surface area of ​​>4000m 2 / m 3 During normal operation, the density of the carrier particles after biofilm formation is 1.0 g / cm 3 -1.01g / cm 3 ; The hydrophilic polyurethane high-molecular-weight and efficient biological carrier particles contain hydrophilic gel components. When the carrier comes into contact with water, the gel absorbs water and expands. After the water absorption and expansion, the total volume of the particles occupies no more than 60% of the internal space of the hollow sphere.

7. A biofilm reactor for sewage treatment according to claim 5, characterized in that: The number of siphon duct assemblies is the same as the number of independent convection spaces; The siphon pipeline assembly includes a siphon main pipe, a vacuum pipe, and a siphon termination pipe; One end of the siphon main pipe passes through the middle sealing plate and is connected to the first convection zone. The lower part of the sedimentation and clarification tank is provided with an inclined tube filler. The other end of the siphon main pipe extends below the inclined tube filler in the sedimentation and clarification tank. One end of the vacuum tube is connected to the top of the siphon main pipe, and the other end extends below the liquid level in the sedimentation and clarification tank; The siphon termination pipe is connected to the siphon main pipe, and the vacuum pipe and the siphon termination pipe are connected through a pipeline; the other end of the siphon main pipe is arranged in the second convection zone, and a siphon terminator is arranged at the end of the siphon termination pipe; The amount of water between the siphon terminator and the highest water level set by the second liquid level gauge is less than 4 / 5 of the total water storage capacity in the first convection zone.

8. A biofilm reactor for sewage treatment according to claim 7, characterized in that: A plurality of cone-shaped parts are provided at the bottom of the sedimentation and clarification tank, and a mud discharge pipe is provided at the bottom of the cone-shaped parts; The lower part of the sedimentation and clarification tank is provided with an inclined tube filler, and one side of the upper part of the sedimentation and clarification tank is provided with a supernatant discharge port; A third liquid level gauge is provided in the sedimentation and clarification tank, and the position at which the third liquid level gauge is provided corresponds to the high liquid level of the sedimentation and clarification tank.

9. The method for using a biofilm reactor for sewage treatment according to any one of claims 1 to 8, characterized in that: The steps include: S1: The pretreated sewage enters the high-level water tank. When the water level in the high-level water tank reaches the upper limit of the water tank, the water inlet pipe stops inletting water and stands for a period of time. When the liquid level in the second convection zone of the convection reactor is lower than the siphon terminator, the outflow solenoid valve opens, and the sewage enters the first convection zone through the pipeline connecting component. The air inlet pipe starts to take in air, and the hydraulic turbine fan starts to rotate. S2: When the water level of the sewage in step S1 reaches the middle sealing plate in the first convection zone, part of the sewage enters the second convection zone through the connecting pipe, and the other part of the sewage enters the siphon pipe assembly; the water level in the second convection zone and the siphon pipe assembly continues to rise, and when the water level in the second convection zone reaches the set water level, the convection reactor stops inflowing, the high-level water tank starts inflowing, and the sewage is left standing in the convection reactor; S3: The sewage in the high-level water tank continues to enter the convection reactor, and the water level in the second convection zone continues to rise until siphon action occurs. The water inflow into the convection reactor stops, and the sewage in the second convection zone flows into the first convection zone through the connecting pipe, and flows into the sedimentation and clarification tank through the siphon pipe assembly. When the water level in the second convection zone drops below the siphon terminator, the siphon stops, and the water in the convection reactor stops flowing to the sedimentation and clarification tank. After standing, the supernatant in the sedimentation and clarification tank is directly discharged.

10. The method for using a biofilm reactor for sewage treatment according to claim 9, characterized in that: The pretreatment in step S1 includes filtering the sewage; And / or, in step S1, the water inlet pipe is left to stand after water inlet stops, and the standing time is at least 1 hour; And / or, in step S2, the sewage is allowed to stand in the convection reactor for 4-8 hours; And / or, when the sewage is left to stand in the convection reactor in step S2, if the dissolved oxygen in the first convection zone is lower than 3 mg / l, aeration is performed, and when the dissolved oxygen in the convection reactor reaches 6 mg / l, aeration is stopped; And / or, the standing time in step S3 is 1-1.5h; The activated sludge concentration in the first convection zone is 1500mg / L~4000mg / L.

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