CN215403357U - Denitrification reactor and sewage treatment system - Google Patents
Denitrification reactor and sewage treatment system Download PDFInfo
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- CN215403357U CN215403357U CN202120976831.8U CN202120976831U CN215403357U CN 215403357 U CN215403357 U CN 215403357U CN 202120976831 U CN202120976831 U CN 202120976831U CN 215403357 U CN215403357 U CN 215403357U
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Abstract
The utility model provides a denitrification reactor and a sewage treatment system, relates to the technical field of sewage treatment equipment, and solves the problem that the existing denitrification process needs to add a carbon source when the carbon-nitrogen ratio of inlet water is small, so that the energy consumption is high. The device comprises a reactor body, wherein an anoxic section and an aerobic section are sequentially arranged in the reactor body from bottom to top, autotrophic denitrification filter materials are filled in the anoxic section, and the aerobic section is arranged above the anoxic section and used for enabling sewage after reaction with the autotrophic denitrification filter materials of the anoxic section to rise to the aerobic section for biological contact oxidation reaction. The utility model leads the sewage to carry out autotrophic denitrification reaction with the autotrophic denitrification filter material in the anoxic section, does not need to additionally add carbon source, has less sludge production, and is particularly suitable for the denitrification of the wastewater with low carbon-nitrogen ratio. And then the sewage is lifted to an aerobic section for biological contact oxidation reaction, so that the head loss is avoided, the aerobic section does not need back flushing, the power loss is low, the sludge production is low, and the method is suitable for treating the low-carbon sewage.
Description
Technical Field
The utility model relates to the technical field of sewage treatment equipment, in particular to a denitrification reactor and a sewage treatment system.
Background
The commonly used denitrification process in the field of water treatment is biological denitrification, which can be divided into heterotrophic denitrification and autotrophic denitrification, wherein the heterotrophic denitrification utilizes heterotrophic denitrifying bacteria to reduce nitrate nitrogen into nitrogen by taking organic matters as carbon sources and electron donors. The traditional three-stage, two-stage and single-stage heterotrophic biological denitrification systems all need to add a carbon source to ensure the denitrification effect, so that the preposed denitrification A/O process is generated at the same time, and the denitrification can be carried out by utilizing the organic matters in the sewage. The common denitrification processes at present comprise a denitrification process (A/O) in the form of an activated sludge process, a denitrification aeration biological filter (combined type and separated type) in the form of a biofilm process, a denitrification deep bed filter process and the like. However, because the carbon source (organic matter) of raw water in a sewage plant is generally insufficient, although the a/O process can significantly reduce the carbon source requirement, when the carbon-nitrogen ratio of raw water is seriously deficient, i.e., when sewage with low carbon and high nitrogen is treated, the reaction effect still needs to be ensured by adding the carbon source, and meanwhile, the yield of sludge is also high because the growth rate of heterotrophic bacteria is high. The combined denitrification biological aerated filter adopts a lower water inlet and upper water outlet mode, wherein the section A and the section O belong to a filtering process, the lower filter is an anoxic section A, the upper filter is an aerobic section O, the operation of the A/O mode is realized in the same filter body, compared with other processes, the combined denitrification biological aerated filter is more integrated and can be independently used for secondary treatment, however, the combined denitrification biological aerated filter also has the problem that a carbon source needs to be added when the carbon-nitrogen ratio of inlet water is low, and meanwhile, the heterotrophic denitrifying bacteria in the anoxic section and the heterotrophic decarbonizing bacteria in the aerobic section can generate a large amount of sludge. In addition, the upper and lower sections of filter tanks need back flushing, which consumes more energy and causes higher energy consumption.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a denitrification reactor and a sewage treatment system, and aims to solve the technical problems that in the prior art, a carbon source needs to be added when the carbon-nitrogen ratio of inlet water is low and the energy consumption is high in the denitrification process. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the utility model are described in detail in the following.
In order to achieve the purpose, the utility model provides the following technical scheme:
the utility model provides a denitrification reactor which comprises a reactor body, wherein an anoxic section and an aerobic section are sequentially arranged in the reactor body from bottom to top, an autotrophic denitrification filter material is filled in the anoxic section, and the aerobic section is arranged above the anoxic section and used for enabling sewage after reaction with the autotrophic denitrification filter material of the anoxic section to rise into the aerobic section for biological contact oxidation reaction.
According to a preferred embodiment, the volume of the aerobic section is larger than the volume of the anoxic section.
According to a preferred embodiment, the bottom of the reactor body is provided with an anoxic section supporting layer, the anoxic section supporting layer is composed of graded pebbles and comprises three levels of pebble layers, the diameters of the pebbles in each level of the pebble layers from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm, and the thickness of the anoxic section supporting layer is 300 mm.
According to a preferred embodiment, a water inlet distribution pipeline, a back-washing distribution pipeline and a back-washing distribution pipeline are arranged in the support layer of the anoxic section, wherein the water inlet distribution pipeline is connected with a water inlet pipe, the back-washing distribution pipeline is connected with a back-washing air inlet pipe, and the back-washing distribution pipeline is connected with a back-washing water inlet pipe.
According to a preferred embodiment, an aerobic section supporting layer is arranged above the anoxic section, the aerobic section supporting layer comprises a supporting layer formed by stainless steel grids with the aperture of 6-8 mm and graded pebbles positioned on the supporting layer, the graded pebbles positioned on the supporting layer comprise three levels of pebble layers, and the diameters of the pebbles in each level of the pebble layers from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm.
According to a preferred embodiment, a filler is arranged above the aerobic section supporting layer of the aerobic section, and the filler comprises integral honeycomb filler, suspension type semi-soft filler, corrugated plate filler, soft filler, shield filler or irregular granular filler.
According to a preferable embodiment, an anoxic section water stabilizing area is formed between the filter material of the anoxic section and the aerobic section supporting layer, and a back flush drain pipe is arranged in the anoxic section water stabilizing area.
According to a preferable embodiment, an aeration air distribution pipeline is arranged in the aerobic section supporting layer and is connected with an air conveying pipe.
According to a preferred embodiment, the top of the reactor body is connected with a water outlet pipe, the water outlet pipe is communicated with a water inlet pipe through a return pipe, a pipeline mixer is arranged on a mixing pipeline after the return pipe is communicated with the water inlet pipe, and a return pump is arranged on the return pipe.
The utility model also provides a sewage treatment system which comprises the denitrification reactor.
Based on the technical scheme, the denitrification reactor at least has the following technical effects:
the denitrification reactor is provided with the anoxic section and the aerobic section in the reactor body from bottom to top in sequence, wherein the anoxic section is filled with the autotrophic denitrification filter material to carry out autotrophic denitrification in the anoxic section, so that the anoxic section does not need to be added with a carbon source, the sludge production is low, and the denitrification reactor is particularly suitable for denitrification for treating low-carbon wastewater; the aerobic section is arranged above the anoxic section and is used for enabling the sewage after reaction with the autotrophic denitrification filter material of the anoxic section to rise to the aerobic section for biological contact oxidation reaction. Therefore, the aerobic section adopts a biological contact oxidation process to avoid head loss caused by filtration, and the aerobic section of the utility model does not need back washing, thereby having less power consumption and less sludge generation amount and being more suitable for the treatment of low-carbon sewage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the denitrification reactor according to the present invention.
In the figure: 1-water inlet pipe; 2-an anoxic section bearing layer; 3-an anoxic zone; 4-aerobic section supporting layer; 5-aerobic section; 6-gas transmission pipe; 7-a water outlet pipe; 8-a return pipe; 9-backwashing the drain pipe; 10-backwashing an air inlet pipe; 11-backwashing a water inlet pipe; 12-a reactor body; 13-water stabilizing area of anoxic section; 14-a line mixer; 15-reflux pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The technical scheme of the utility model is explained in detail in the following with reference to the attached figure 1 of the specification.
As shown in figure 1, the utility model provides a denitrification reactor, which comprises a reactor body 12, wherein an anoxic section 3 and an aerobic section 5 are sequentially arranged in the reactor body 12 from bottom to top. Wherein, the anoxic section 3 is filled with autotrophic denitrification filter materials, and the aerobic section 5 is arranged above the anoxic section 3 and is used for leading the sewage after the reaction with the autotrophic denitrification filter materials of the anoxic section 3 to rise to the aerobic section 5 for biological contact oxidation reaction. Therefore, the sewage in the anoxic section 3 can be subjected to autotrophic denitrification reaction with the autotrophic denitrification filter material, no additional carbon source is required to be added, the sludge production amount is small, and the method is particularly suitable for denitrification for treating low-carbon wastewater. The sewage after autotrophic denitrification nitrogen removal treatment rises to the aerobic section for biological contact oxidation reaction, so that the head loss generated by filtration is avoided, the aerobic section does not need back flushing, the power loss is low, the sludge generation amount is low, and the method is suitable for treating low-carbon sewage.
The denitrification reactor adopts a biological treatment mode that an autotrophic denitrification filter tank mode is coupled with a biological contact oxidation tank mode, takes the autotrophic denitrification filter tank as an anoxic section, takes the biological contact oxidation tank as an aerobic section, takes the anoxic section as the lower part, takes the aerobic section as the upper part, adopts lower water inlet and upper water outlet, and forms a novel A/O combined denitrification autotrophic denitrification filter tank and a biological contact oxidation tank, thereby combining the advantages that the autotrophic denitrification filter tank does not need to be added with an organic carbon source and has less sludge, and the characteristics of no filtration, no back flushing, less power consumption, less sludge yield and low denitrification load of biological contact oxidation, being used for treating low-carbon high-nitrogen sewage and realizing the optimization of the process.
Preferably, the cross-sectional area of the reactor body 12 is not more than 100m2. Preferably, the volume of the aerobic section 5 is larger than that of the anoxic section 3, so that the treatment effect is better, and the device is more suitable for treating low-carbon sewage. Preferably, the ratio of the hydraulic retention time of the anoxic section to the aerobic section of the present invention is 1: 4. Preferably, the autotrophic denitrification filter material in the anoxic section 3 has a particle size of 2-6 mm, and the filter material is a substrate or composite mineral with sulfur and iron as denitrification electron donors.
Preferably, the bottom of the reactor body 12 is provided with an anoxic section supporting layer 2, and the anoxic section supporting layer 2 is composed of graded pebbles. Preferably, the supporting layer 2 of the anoxic section comprises three pebble layers, and the diameters of pebbles in each pebble layer from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm. Preferably, the height of each pebble layer is 100 mm. Preferably, the anoxic zone support layer 2 has a thickness of 300 mm.
Preferably, a water inlet distribution pipeline, a backwashing distribution pipeline and a backwashing distribution pipeline are arranged in the anoxic section supporting layer 2. Wherein, the water inlet distribution pipeline is connected with the water inlet pipe 1, the back washing distribution pipeline is connected with the back washing air inlet pipe 10, and the back washing distribution pipeline is connected with the back washing water inlet pipe 11. Preferably, the water inlet distribution pipeline, the backwashing distribution pipeline and the backwashing distribution pipeline are all in a perforated pipe form.
Preferably, an anoxic section water stabilizing area 13 is formed between the filter material of the anoxic section 3 and the aerobic section supporting layer 4. Preferably, the height of the anoxic section water stabilization zone 13 is 0.5 m. Preferably, a backwashing water discharge pipe 9 is arranged in the water stabilizing area 13 of the anoxic section to perform weir flow water collection.
Preferably, an aerobic section supporting layer 4 is arranged above the anoxic section 3, the aerobic section supporting layer 4 comprises a supporting layer formed by stainless steel grids with the aperture of 6-8 mm and graded pebbles positioned on the supporting layer, the graded pebbles positioned on the supporting layer comprise three levels of pebble layers, and the diameters of the pebbles in each level of the pebble layers from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm. Preferably, the height of each pebble layer is 100 mm. Preferably, the total thickness of the graded pebbles is 300 mm. Preferably, the filler is arranged above the aerobic section supporting layer 4 of the aerobic section 5, and the filler comprises integral honeycomb filler, suspension semi-soft filler, corrugated plate filler, soft filler, shield filler or irregular granular filler.
Preferably, an aeration gas distribution pipeline is arranged in the aerobic section supporting layer 4 and is connected with the gas conveying pipe 6 for carrying out oxygenation aeration in the aerobic section. Preferably, the aeration gas distribution pipeline is in a perforated pipe form.
Preferably, a water outlet pipe 7 is connected to the top of the reactor body 12 to perform weir flow water collection. The water outlet pipe 7 is communicated with the water inlet pipe 1 through a return pipe 8, so that part of the outlet water is hydrated with the water inlet pipe 1 through the return pipe 8, and part of the outlet water is returned to bring the nitrate nitrogen contained in the outlet water back to the anoxic section to participate in the autotrophic denitrification reaction. A pipeline mixer 14 is arranged on the mixing pipeline after the return pipe 8 is communicated with the water inlet pipe 1 and is used for fully mixing the return water and the inlet water. A reflux pump 15 is provided on the reflux pipe 8 to control the reflux ratio. Preferably, when the inflow rate is Q, the reflux rate is 2-3Q.
The operation flow of the denitrification reactor of the utility model is as follows:
the water is fed from a water inlet pipe 1 at the bottom of the reactor body, the water inlet quantity is Q, the water enters an anoxic section 3 after passing through a water inlet and distribution pipeline in an anoxic section supporting layer 2, and nitrate nitrogen in the return water is reduced into nitrogen and overflows after reacting with the autotrophic denitrification filter material. The effluent of the anoxic section 3 enters the aerobic section 5 after passing through the aerobic section supporting layer 4, the aerobic section 5 performs oxygenation aeration through the gas pipe 6, and the sewage is collected and discharged through the top water outlet pipe 7 of the reactor body after undergoing BOD oxidation degradation, ammoniation and nitrification of the influent TN in the aerobic section. Part of the effluent water with the flow rate of 2-3Q is hydrated with the water inlet pipe 1 through the return pipe 8, and nitrate nitrogen contained in the effluent water is brought back to the anoxic section 3 to participate in autotrophic denitrification reaction.
The anoxic section of the utility model can be backwashed independently without backwashing of the whole tank, and the backwashing flow of the anoxic section autotrophic denitrification filter tank is as follows:
and after the reactor operates for 24-48 hours, or after the filtration resistance of the autotrophic denitrification filter reaches a set value of 0.5-0.7 m, backwashing is required. The back washing adopts a gas-water back washing mode, and the back washing water source is the effluent of the reactor. Firstly, closing a valve on a water inlet pipe 1 of the reactor, opening a valve on a back flush drain pipe 9, discharging water above the height of a water outlet weir of the back flush drain pipe 9, and then starting a gas-water back flush procedure of the autotrophic denitrification filter tank at the anoxic section:
a: air washing is carried out firstly. And opening a valve on the backwashing air inlet pipe 10, and introducing compressed air into the autotrophic denitrification filter tank through a backwashing air distribution pipeline buried in the support layer 2 of the anoxic zone for air washing for 2-5 min.
B: and (5) air-water combined flushing. And opening a valve on the backwashing water inlet pipe 11, feeding water from the water outlet storage tank into the autotrophic denitrification filter tank through a backwashing water distribution pipeline, and flushing for 5-8 min together with gas.
C: and washing with water. And (4) closing a valve on the backwashing air inlet pipe 10, and closing a valve on the backwashing water inlet pipe 11 after 5-15 min.
And (5) after the back washing is finished, closing a valve on the back washing drain pipe 9 and then starting the operation of the reactor.
The denitrification reactor adopts the anoxic section in the mode of the autotrophic denitrification filter tank and the aerobic section in the mode of the biological contact oxidation tank to form an integrated reactor, no carbon source is required to be added in the reaction, the head loss caused by filtration is avoided, the aerobic section does not need back flushing, the sludge production amount of the aerobic section and the anoxic section is less, the energy consumption is lower, and the denitrification reactor is more suitable for the treatment of low-carbon sewage.
Example 2
This example provides a wastewater treatment system comprising the denitrification reactor of example 1.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The utility model provides a denitrification reactor, its characterized in that, includes reactor body (12) be equipped with anoxic section (3) and aerobic section (5) from bottom to top in proper order in reactor body (12), wherein, anoxic section (3) intussuseption is filled with autotrophic denitrification filter material, aerobic section (5) set up anoxic section (3) top be used for make with sewage after the autotrophic denitrification filter material of anoxic section (3) reacts rises to carry out biological contact oxidation reaction in aerobic section (5).
2. The denitrification reactor according to claim 1, wherein the volume of the aerobic section (5) is larger than the volume of the anoxic section (3).
3. The denitrification reactor according to claim 1, wherein an anoxic section supporting layer (2) is arranged at the bottom of the reactor body (12), the anoxic section supporting layer (2) is composed of graded pebbles, the anoxic section supporting layer (2) is composed of three levels of pebble layers, the diameters of the pebbles in each level of pebble layers from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm, and the thickness of the anoxic section supporting layer (2) is 300 mm.
4. The denitrification reactor according to claim 3, wherein a water inlet distribution pipeline, a back-washing distribution pipeline and a back-washing distribution pipeline are arranged in the anoxic section supporting layer (2), wherein the water inlet distribution pipeline is connected with the water inlet pipe (1), the back-washing distribution pipeline is connected with the back-washing air inlet pipe (10), and the back-washing distribution pipeline is connected with the back-washing water inlet pipe (11).
5. The denitrification reactor according to claim 4, wherein an aerobic section supporting layer (4) is arranged above the anoxic section (3), the aerobic section supporting layer (4) comprises a supporting layer formed by stainless steel grids with the aperture of 6-8 mm and graded pebbles on the supporting layer, the graded pebbles on the supporting layer comprise three levels of pebble layers, and the diameters of the pebbles in each level of the pebble layers from top to bottom are respectively 2-4 mm, 4-8 mm and 8-16 mm.
6. The denitrification reactor according to claim 5, wherein a packing is provided above the aerobic section support layer (4) of the aerobic section (5), and the packing comprises integral honeycomb packing, suspended semi-flexible packing, corrugated plate packing, flexible packing, shield packing or irregular granular packing.
7. The denitrification reactor according to claim 5, wherein an anoxic zone water stabilizing zone (13) is formed between the filter material of the anoxic zone (3) and the aerobic zone supporting layer (4), and a back flush drain pipe (9) is arranged in the anoxic zone water stabilizing zone (13).
8. The denitrification reactor according to claim 5, wherein an aeration gas distribution pipeline is arranged in the aerobic section supporting layer (4), and the aeration gas distribution pipeline is connected with a gas conveying pipe (6).
9. The denitrification reactor according to claim 1, wherein a water outlet pipe (7) is connected to the top of the reactor body (12), the water outlet pipe (7) is communicated with the water inlet pipe (1) through a return pipe (8), a pipe mixer (14) is arranged on a mixing pipe after the return pipe (8) is communicated with the water inlet pipe (1), and a return pump (15) is arranged on the return pipe (8).
10. A sewage treatment system comprising the denitrification reactor of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113044986A (en) * | 2021-05-08 | 2021-06-29 | 北控水务(中国)投资有限公司 | Denitrification reactor and sewage treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113044986A (en) * | 2021-05-08 | 2021-06-29 | 北控水务(中国)投资有限公司 | Denitrification reactor and sewage treatment system |
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