Denitrification phosphorus and nitrogen removal system

Abstract

The denitrification dephosphorization and denitrification system comprises an anaerobic tank, an aerobic tank and an SBR (sequencing batch reactor) tank, the anaerobic tank is communicated with the aerobic tank through a first pipeline, and the aerobic tank is communicated with the SBR tank through a second pipeline; the first sludge pump is communicated with the anaerobic tank and the bottom of the SBR tank through a third pipeline, the second sludge pump is communicated with the anaerobic tank and the bottom of the SBR tank through a fourth pipeline, the first sludge pump is used for pumping sludge at the bottom of the anaerobic tank into the SBR tank, and the second sludge pump is used for pumping sludge at the bottom of the SBR tank into the SBR tank. The second sludge pump is used for pumping sludge at the bottom of the SBR tank to the anaerobic tank; the fourth pipeline is provided with a blow-off pipeline communicated with the outside; according to the utility model, the problems that the operation stability is poor, the sludge bulking and the sludge loss are easy to occur and the separation effect is not ideal enough due to the absence of a sludge return system in the traditional SBR process can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a denitrification phosphorus removal and nitrogen removal system. Background Art

[0002] The low C / N content in rural domestic sewage limits the treatment effect of traditional biological denitrification and phosphorus removal processes. In actual denitrification and phosphorus removal, a large amount of carbon source is often required, resulting in increased treatment costs. Denitrification and phosphorus removal technology has outstanding technical advantages in treating low C / N domestic sewage, but the existing denitrification and phosphorus removal process is relatively complicated and difficult to apply in rural areas.

[0003] Basic principle of denitrification and phosphorus removal: In the anaerobic reaction stage, part of the organic matter is converted into VFA (volatile fatty acids) through fermentation, and polyphosphate bacteria decompose polyphosphate particles in the body to generate energy, absorb VFA through active transport, and combine with glycogen in the body to synthesize polyhydroxyalkanoates. In the anoxic and aerobic reaction stages, polyphosphate bacteria use NO3--N and O2 as electron acceptors to decompose polyhydroxyalkanoates to generate glycogen, and use the generated energy to absorb phosphate to synthesize polyphosphate particles.

[0004] Traditional nitrogen removal and phosphorus removal operations are generally carried out in SBR reaction tanks. SBR is the abbreviation of sequencing batch activated sludge process, which is an activated sludge sewage treatment technology that operates in an intermittent aeration mode. Its main feature is the orderly and intermittent operation. The core of SBR technology is the SBR reaction tank, which integrates homogenization, primary sedimentation, biodegradation, secondary sedimentation and other functions in one tank. The disadvantage of SBR process is that there is no sludge return system, which makes the operation stability poor, sludge swelling and sludge loss are prone to occur, and the separation effect is not ideal. Utility Model Content

[0005] In order to overcome the above shortcomings, the purpose of the utility model is to provide a denitrification phosphorus removal and nitrogen removal system.

[0006] In order to achieve the above objectives, the technical solution adopted by the utility model includes:

[0007] An anaerobic tank, an aerobic tank and an SBR tank, wherein the anaerobic tank is connected to the aerobic tank via a first pipeline, and the aerobic tank is connected to the SBR tank via a second pipeline;

[0008] A first sludge pump and a second sludge pump, wherein the first sludge pump is connected to the bottom of the anaerobic tank and the SBR tank through a third pipeline, and the second sludge pump is connected to the bottom of the anaerobic tank and the SBR tank through a fourth pipeline, the first sludge pump is used to pump the sludge at the bottom of the anaerobic tank to the SBR tank, and the second sludge pump is used to pump the sludge at the bottom of the SBR tank to the anaerobic tank; wherein the fourth pipeline is provided with a sewage pipeline connected to the outside.

[0009] The present application adds an aerobic tank between the anaerobic tank and the SBR tank to convert nitrogen-containing substances in the sewage into nitrates, thereby providing conditions for the enrichment of denitrifying polyphosphate bacteria. At the same time, it solves the shortcomings of the SBR system, such as poor stability and sludge bulking, and utilizes denitrifying polyphosphate bacteria to solve the problem of insufficient carbon source for biological sewage denitrification and phosphorus removal. In addition, the equipment of the present application has a simple structure, stable operation, and low space occupancy, and has certain market prospects.

[0010] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, a fixed bed biofilm filler is arranged in the aerobic tank.

[0011] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, a stirring pump is arranged at the lower part of the anaerobic pump and / or the SBR tank.

[0012] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, a first lift pump and a first valve are arranged on the first pipeline.

[0013] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, a second lift pump and a second valve are arranged on the second pipeline.

[0014] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, the bottom of the anaerobic tank and the SBR tank is configured as a sedimentation structure with a downward depression in the center, and the gravity of the sludge in the anaerobic tank or the SBR tank is utilized to make the sludge automatically gather downward.

[0015] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, the cross-section of the deposition structure is any one of a cone and an arc.

[0016] In the preferred technical solution of the above-mentioned denitrification phosphorus removal and nitrogen removal system, the surfaces of the anaerobic tank, the aerobic tank and the SBR tank are sprayed with a polytetrafluoroethylene coating.

[0017] The beneficial effect of the utility model is that an aerobic tank is added between the anaerobic tank and the SBR tank to convert nitrogen-containing substances in sewage into nitrates, thereby providing conditions for the enrichment of denitrifying polyphosphate bacteria, while solving the shortcomings of the SBR system such as poor stability and easy sludge swelling, and using denitrifying polyphosphate bacteria to solve the problem of insufficient carbon source for biological sewage denitrification and phosphorus removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the utility model;

[0019] In the figure: anaerobic tank 1, aerobic tank 2, SBR tank 3, first pipeline 4, second pipeline 5, first sludge pump 6, second sludge pump 7, third pipeline 8, fourth pipeline 9, sewage pipeline 10, fixed bed biofilm filler 11, stirring pump 12. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0021] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element 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" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "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. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Based on the problems pointed out in the background technology, the traditional SBR process has poor operation stability, sludge swelling and sludge loss, and unsatisfactory separation effect due to the lack of a sludge return system. The utility model provides a denitrification phosphorus removal and denitrification system, which aims to convert nitrogen-containing substances in sewage into nitrates by adding an aerobic tank 2 between the anaerobic tank 1 and the SBR tank 3, thereby providing conditions for the enrichment of denitrifying polyphosphate bacteria, while solving the shortcomings of the SBR system such as poor stability and sludge swelling, and using denitrifying polyphosphate bacteria to solve the problem of insufficient carbon source for biological sewage denitrification and phosphorus removal.

[0024] like Figure 1 As shown, the denitrification and denitrification system of the utility model includes: an anaerobic tank 1, an aerobic tank 2 and an SBR tank 3, the anaerobic tank 1 is connected to the aerobic tank 2 through a first pipeline 4, and the aerobic tank 2 is connected to the SBR tank 3 through a second pipeline 5; a first sludge pump 6 and a second sludge pump 7, the first sludge pump 6 is connected to the bottom of the anaerobic tank 1 and the SBR tank 3 through a third pipeline 8, and the second sludge pump 7 is connected to the bottom of the anaerobic tank 1 and the SBR tank 3 through a fourth pipeline 9, the first sludge pump 6 is used to pump the sludge at the bottom of the anaerobic tank 1 to the SBR tank 3, and the second sludge pump 7 is used to pump the sludge at the bottom of the SBR tank 3 to the anaerobic tank 1; wherein the fourth pipeline 9 is provided with a sewage pipeline 10 connected to the outside.

[0025] See also Figure 1In the anaerobic tank 1, part of the organic matter in the anaerobic tank 1 is fermented and converted into VFA (volatile fatty acids), and the polyphosphate particles in the body are decomposed by polyphosphate bacteria to produce energy, and VFA is absorbed by active transport, and combined with glycogen in the body to synthesize polyhydroxyalkanoates.

[0026] In aerobic pool 2, microorganisms decompose organic matter in sewage into carbon dioxide, water and other inorganic salts through metabolic activities, and convert nitrogen-containing substances (such as ammonia nitrogen) into nitrates, providing conditions for the enrichment of denitrifying polyphosphate bacteria.

[0027] In SBR pool 3, polyphosphate bacteria use nitrate nitrogen and oxygen as electron acceptors to decompose polyhydroxyalkanoates to generate glycogen, and use the generated energy to absorb phosphate to synthesize polyphosphate particles. The phosphate particles can be mixed in the sludge and discharged from SBR pool 3 to achieve the purpose of phosphorus removal.

[0028] During operation, the sewage is first introduced into the anaerobic tank 1 for anaerobic reaction to generate polyhydroxyalkanoates. After the reaction is completed, the sewage is allowed to stand, and then discharged into the aerobic tank 2 for aerobic reaction, thereby converting nitrogen-containing substances in the sewage into nitrates. Nitrates can provide conditions for the enrichment of denitrifying polyphosphate bacteria. After the reaction is completed in the aerobic tank 2, the sewage is discharged into the SBR tank 3. In the SBR tank 3, the denitrifying polyphosphate bacteria use nitrate nitrogen and oxygen as electron acceptors to decompose polyhydroxyalkanoates to generate glycogen, and use the generated energy to absorb phosphate to synthesize polyphosphate particles. After the reaction in the SBR tank 3 is completed and left to stand, the first sludge pump 6 is used to transport the sludge containing polyhydroxyalkanoic acid esters at the bottom of the anaerobic tank 1 to the SBR tank 3, so that the nitrate (electron acceptor) in the SBR tank 3 can fully react with the polyhydroxyalkanoic acid esters (electron donors), thereby absorbing the phosphate in the sewage to form polyphosphate particles, achieving denitrification and phosphorus removal effects, and the formed polyphosphate particles will be discharged along with the sludge through the sewage pipe 10; while the first sludge pump 6 is working, the second sludge pump 7 is controlled to work to discharge the sludge in the SBR tank 3 into the anaerobic tank 1. The sludge contains polyphosphate particles and polyphosphate bacteria that have not completely reacted in the anaerobic tank 1. By providing polyphosphate bacteria, the sufficient reaction of VFA and polyphosphate bacteria in the anaerobic tank 1 can be effectively guaranteed, thereby forming more polyhydroxyalkanoic acid esters.

[0029] The present application adds an aerobic tank 2 between the anaerobic tank 1 and the SBR tank 3 to convert nitrogen-containing substances in the sewage into nitrates, thereby providing conditions for the enrichment of denitrifying polyphosphate bacteria. At the same time, it solves the shortcomings of the SBR system, such as poor stability and sludge bulking, and utilizes denitrifying polyphosphate bacteria to solve the problem of insufficient carbon source for biological sewage denitrification and phosphorus removal. In addition, the equipment of the present application has a simple structure, stable operation, and low space occupancy, and has certain market prospects.

[0030] In one or more embodiments, a fixed bed biofilm filler 11 is disposed in the aerobic tank 2. The fixed bed biofilm filler 11 serves as an attachment carrier for microorganisms in the aerobic tank 2, increases the contact area between microorganisms and sewage, and further improves the efficiency and quality of sewage treatment.

[0031] In one or more embodiments, a stirring pump 12 is disposed below the anaerobic pump and / or the SBR tank 3. Figure 1 The stirring pump 12 can stir the sludge, so that the sludge containing polyphosphate bacteria in the anaerobic tank 1 can fully react with the VFA in the sewage to form polyhydroxyalkanoic acid esters, and the sludge containing polyhydroxyalkanoic acid esters in the SBR tank 3 can fully react with the nitrate in the sewage to achieve the effect of denitrification and phosphorus removal.

[0032] In one or more embodiments, a first lift pump and a first valve are disposed on the first pipeline 4 ; a second lift pump and a second valve are disposed on the second pipeline 5 .

[0033] See also Figure 1 The first lifting pump is used to pump the sewage after standing in the anaerobic tank 1 to the aerobic tank 2, and the second lifting pump is used to pump the sewage after standing in the aerobic tank 2 to the SBR tank 3; the first valve can be in an open state in conjunction with the operation of the first lifting pump, and the second valve can be in an open state in conjunction with the operation of the second lifting pump.

[0034] In other possible implementations, a third lift pump and a third valve are further configured at the water outlet of the SBR tank 3. The third lift pump can pump sewage out of the SBR tank 3, and the third valve is used to cooperate with the third lift pump to open or close.

[0035] In one or more embodiments, the bottom of the anaerobic tank 1 and the SBR tank 3 is configured as a sedimentation structure with a downward depression at the center, and the gravity of the sludge in the anaerobic tank 1 or the SBR tank 3 is used to make the sludge automatically gather downward; the cross-section of the sedimentation structure is any one of a cone and an arc.

[0036] It should be noted that the sedimentation structure can collect the sludge at the bottom of the anaerobic tank 1 or the SBR tank 3, so that the first sludge pump 6 and the second sludge pump 7 can extract the sludge, thereby avoiding the accumulation of sludge in the anaerobic tank 1 and the SBR tank 3.

[0037] In one or more embodiments, a polytetrafluoroethylene coating is sprayed on the surface of the anaerobic tank 1, the aerobic tank 2, and the SBR tank 3. It should be noted that the polytetrafluoroethylene coating has a certain self-lubricating effect. Through this setting, the sludge adhesion on the surface of the anaerobic tank 1, the aerobic tank 2, or the SBR tank 3 can be reduced, and the sludge discharge effect can be improved.

[0038] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A denitrification phosphorus removal and nitrogen removal system, characterized in that: include: An anaerobic tank, an aerobic tank and an SBR tank, wherein the anaerobic tank is connected to the aerobic tank via a first pipeline, and the aerobic tank is connected to the SBR tank via a second pipeline; A first sludge pump and a second sludge pump, wherein the first sludge pump is connected to the bottom of the anaerobic tank and the SBR tank through a third pipeline, and the second sludge pump is connected to the bottom of the anaerobic tank and the SBR tank through a fourth pipeline, the first sludge pump is used to pump the sludge at the bottom of the anaerobic tank to the SBR tank, and the second sludge pump is used to pump the sludge at the bottom of the SBR tank to the anaerobic tank; wherein the fourth pipeline is provided with a sewage pipeline connected to the outside.

2. The denitrification and dephosphorization and denitrification system according to claim 1, characterized in that: The aerobic pool is provided with a fixed bed biofilm filler.

3. The denitrification and dephosphorization and denitrification system according to claim 1, characterized in that: A stirring pump is disposed at the lower part of the anaerobic tank and / or the SBR tank.

4. The denitrification phosphorus removal and nitrogen removal system according to claim 1, characterized in that: The first pipeline is provided with a first lift pump and a first valve.

5. The denitrification and dephosphorization and denitrification system according to claim 1 or 4, characterized in that: The second pipeline is provided with a second lift pump and a second valve.

6. The denitrification phosphorus removal and nitrogen removal system according to claim 1, characterized in that: The bottom of the anaerobic tank and the SBR tank is configured as a sedimentation structure with a downward depression at the center, and the gravity of the sludge in the anaerobic tank or the SBR tank is utilized to make the sludge automatically gather toward the bottom.

7. The denitrification phosphorus removal and nitrogen removal system according to claim 6, characterized in that: The cross section of the deposition structure is any one of a cone shape and an arc shape.

8. The denitrification phosphorus removal and nitrogen removal system according to claim 1, characterized in that: The surfaces of the anaerobic tank, the aerobic tank and the SBR tank are sprayed with a polytetrafluoroethylene coating.

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