Denitrification reactor

Abstract

The embodiment relates to the technical field of sewage treatment, and discloses a denitrification reactor which comprises a reactor body, an aeration device, a liquid inlet device and a separation device, the interior of the reactor body is sequentially divided into an anoxic zone, an aerobic zone and a water outlet zone from bottom to top in the height direction, and the water outlet zone is provided with a water outlet weir; a water collecting tank is formed between the effluent weir and the inner wall of the reactor body; the aeration device is arranged in the reactor body and is positioned in the aerobic zone; the liquid outlet end of the liquid inlet device is communicated with the anoxic zone and is used for introducing liquid to be treated into the reactor body for reaction; the separation device is located outside the reactor body, the liquid inlet end of the separation device is communicated with the water collecting tank, and the separation device is used for separating liquid treated by the aerobic zone and the anoxic zone and enabling the separated mixed liquid to flow back into the reactor body. The denitrification reactor disclosed by the embodiment of the utility model is simple in equipment, low in mounting space requirement and low in cost, and has a better denitrification effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, especially a kind of denitrification reactor. BACKGROUND

[0002] Wastewater denitrification is an important link in wastewater treatment, and biological denitrification is an important way of wastewater denitrification. Biological denitrification is mainly under the action of microorganisms, ammonia nitrogen and organic nitrogen in wastewater are converted into nitrogen by ammonification, nitrification and denitrification. The current conventional biological denitrification method mainly uses AO / AAO and other concrete biological reaction pool as the reaction place, and needs to be matched with sedimentation tank and other functional tanks for auxiliary operation, so that the pool volume used is large, the land area is large, there are problems of high cost, high control precision requirement, complex system and control operation, poor denitrification effect. UTILITARY MODEL

[0003] The utility model aims at providing a kind of denitrification reactor, its equipment is simple, cost is low and denitrification effect is good.

[0004] The application embodiment provides a kind of denitrification reactor, including:

[0005] Reactor body, inside sequentially divided by height direction from below to above has anoxic zone, aerobic zone and effluent zone, the effluent zone is equipped with effluent weir, and the effluent weir and the inner wall of the reactor body form water collecting groove between them;

[0006] Aeration device, it is located in the inside of the reactor body and located in the aerobic zone;

[0007] Liquid inlet device, outlet end and the anoxic zone are communicated, for the liquid to be handled into the reactor body and carries out reaction;

[0008] Separation device, it is located in the outside of the reactor body, the liquid inlet end of the separation device and the water collecting groove are communicated, for the liquid handled after the aerobic zone and the anoxic zone are separated, and after separating the mixed liquid is backflowed to the reactor body.

[0009] In an embodiment, the separation device includes a separator, a circulation pipe and a first effluent pipe, one end of the first effluent pipe is connected to the water collecting groove, the other end is connected to the water inlet of the separator, the first water outlet of the separator is connected to one end of the circulation pipe, the other end of the circulation pipe is connected to the liquid inlet device, to flow back the mixed liquid separated by the separator into the reactor body.

[0010] In an embodiment, the separation device further comprises a second water outlet pipe, one end of the second water outlet pipe being connected to a second water outlet of the separator for leading out water separated by the separator.

[0011] In an embodiment, the circulation pipe is respectively provided with a first flow meter and a first control valve, and the first water outlet pipe is provided with a second control valve.

[0012] In an embodiment, the second water outlet pipe is respectively provided with a second flow meter and a third control valve.

[0013] In an embodiment, the liquid inlet device comprises a water inlet pipe, a water distributor and a power pump, the water distributor being at least partially arranged in the reactor body and located in the anoxic zone, one end of the water distributor extending out of the reactor body and being connected to one end of the water inlet pipe, the other end of the water inlet pipe being used for connecting an external water source, and the water inlet pipe being in communication with the circulation pipe, the portion of the water distributor arranged in the reactor body being provided with water distribution holes at intervals, and the power pump being arranged on the water inlet pipe for pumping liquid to be treated into the reactor body.

[0014] In an embodiment, the water inlet pipe is respectively provided with a third flow meter, a fourth control valve and a check valve.

[0015] In an embodiment, the aeration device comprises an aeration pipe and a plurality of aeration heads, the aeration pipe being at least partially arranged in the reactor body and located in the aerobic zone, and the aeration heads being connected to the aeration pipe at intervals, one end of the aeration pipe located outside the reactor body being used for connecting an aeration pump or an aeration fan.

[0016] In an embodiment, the denitrification reactor further comprises a sampling pipe arranged outside the reactor body, the sampling pipe being in communication with the reactor body for sampling from the aerobic zone and the anoxic zone, and the sampling pipe being further provided with a fifth control valve.

[0017] In an embodiment, the reactor body is provided with a plurality of manholes on the surface.

[0018] The above technical solution provided by the embodiments of the present application has the following beneficial effects compared with the prior art:

[0019] The denitrification reactor of the present application can inoculate anaerobic bacterial granular sludge and aerobic bacterial granular sludge in the anoxic zone and the aerobic zone respectively, and then can perform denitrification and anaerobic ammonia oxidation reaction in the same container, so as to ensure to improve the denitrification effect, and the device is simple, has small installation space requirement and low cost. In addition, after the liquid in the water collecting tank is separated by the separation device, the separated solid mixed liquid flows back to the liquid inlet device and reenters the reactor body together with new wastewater, so as to be fully contacted with the anaerobic bacterial granular sludge and the aerobic bacterial granular sludge again, fully utilize the anaerobic bacterial granular sludge and the aerobic bacterial granular sludge to improve the denitrification efficiency, and has better denitrification effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an embodiment structure schematic view of a denitrification reactor of the present application;

[0021] Figure 2 is a structure schematic view of a water distributor in a denitrification reactor of the present application.

[0022] REFERENCE NUMERALS IN DRAWINGS

[0023] 10, reactor body;11, anoxic zone;12, aerobic zone;13, effluent zone;20, effluent weir;30, aeration device;31, aeration pipe;32, aeration head;40, liquid inlet device;41, water inlet pipe;42, water distributor;42a, water distribution hole;421, mounting frame;422, second water distribution pipe;423, first water distribution pipe;43, power pump;44, third flow meter;45, fourth control valve;46, check valve;50, separation device;51, separator;52, first effluent pipe;53, circulation pipe;54, second effluent pipe;55, first flow meter;56, first control valve;57, second control valve;58, second flow meter;59, third control valve;60, sampling pipe;70, fifth control valve;80, access port. DETAILED DESCRIPTION

[0024] In order to have a clearer understanding of the technical features, purposes and effects of the present application, the specific implementation mode of the present application will be described in detail with reference to the drawings. In the following description, it should be understood that the directions or position relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or position relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the present technical solution, and cannot be understood as indicating that the indicated device or element must have a particular direction, therefore it cannot be understood as a limitation on the present application.

[0025] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0026] Please refer to Figure 1 The present application provides a denitrification reactor, which comprises a reactor body 10, an aeration device 30, a liquid inlet device 40 and a separation device 50. The inside of the reactor body 10 is divided into an anoxic zone 11, an aerobic zone 12 and a water outlet zone 13 from bottom to top along the height direction. The water outlet zone 13 is provided with a water weir 20, and a water collecting tank is formed between the water weir 20 and the inner wall of the reactor body 10. The aeration device 30 is arranged in the inside of the reactor body 10 and located in the aerobic zone 12. The liquid outlet end of the liquid inlet device 40 is communicated with the anoxic zone 11, and is used for feeding the liquid to be treated into the reactor body 10 for reaction. The separation device 50 is located outside the reactor body 10, the liquid inlet end of the separation device 50 is communicated with the water collecting tank, and is used for separating the liquid treated by the aerobic zone 12 and the anoxic zone 11, and refluxing the separated mixed liquid into the reactor body 10.

[0027] In this embodiment, the wastewater to be treated is fed into the anoxic zone 11 by the liquid inlet device 40, so that the anaerobic bacteria (such as anaerobic ammonia oxidation bacteria) in the anoxic zone 11 perform anaerobic biological denitrification. Then the water level rises into the aerobic zone 12, and the aerobic bacteria (such as nitrite bacteria) in the aerobic zone 12 perform aerobic biological denitrification on the wastewater. Then the wastewater flows out to the water collecting tank through the water weir 20. Then the liquid in the water collecting tank is fed into the separation device 50 through the first water outlet pipe 52, so that the liquid is separated to form water and solid mixed liquid. The solid mixed liquid flows out to the liquid inlet device 40 through the circulation pipe 53, so that the solid mixed liquid and the new wastewater enter into the reactor body 10 together, so as to achieve cyclic treatment, prevent the nitrogen in the wastewater from being discharged without being completely removed, and improve the denitrification efficiency. That is, the denitrification reactor of the present application can inoculate anaerobic bacteria granular sludge and aerobic bacteria granular sludge in the anoxic zone 11 and the aerobic zone 12 respectively, and then can perform denitrification and anaerobic ammonia oxidation reaction in the same container, so as to ensure to improve the denitrification effect, and the equipment is simple, the installation space requirement is small, and the cost is low. In addition, after the liquid in the water collecting tank is separated by the separation device 50, the separated solid mixed liquid flows back to the liquid inlet device 40 and reenters into the reactor body 10 with the new wastewater, so as to be fully contacted with the anaerobic bacteria granular sludge and the aerobic bacteria granular sludge again, fully utilize the anaerobic bacteria granular sludge and the aerobic bacteria granular sludge to improve the denitrification efficiency, and has better denitrification effect.

[0028] Exemplarily, the aeration device 30 is used for supplying oxygen for aeration to the aerobic zone 12, so as to maintain the survival of the aerobic bacteria in the aerobic zone 12, and prevent the aerobic bacteria in the aerobic zone 12 from being reduced due to oxygen deficiency, thereby causing the problem of poor nitrogen removal efficiency. In this regard, the aeration device 30 can adopt the specific structure of the following embodiments, or can adopt the aeration component in the prior art which can achieve the oxygen supply and aeration to the aerobic zone 12, and the present disclosure is not limited in this regard.

[0029] In an embodiment, the separation device 50 comprises a separator 51, a circulation pipe 53, and a first water outlet pipe 52, one end of the first water outlet pipe 52 being connected to the water collecting tank, and the other end being connected to the water inlet of the separator 51, the first water outlet of the separator 51 being connected to one end of the circulation pipe 53, and the other end of the circulation pipe 53 being connected to the liquid inlet device 40, so as to flow the mixed liquid separated by the separator 51 back into the reactor body 10.

[0030] That is, the liquid flowing out of the water outlet weir 20 into the water collecting tank is introduced into the separator 51 through the first water outlet pipe 52, so that the liquid is separated into water and solid mixed liquid under the separation of the separator 51, and the solid mixed liquid flows out of the separator 51 through the circulation pipe 53 to the liquid inlet device 40, so that the solid mixed liquid and the new wastewater enter the reactor body 10 together, so as to achieve the recycling treatment, prevent the nitrogen in the wastewater from being discharged without being removed completely, and improve the nitrogen removal efficiency.

[0031] In actual application, the separator 51 is a cyclone separator 51, when the wastewater flows into the cyclone separator 51 from the inlet in the tangential direction, the wastewater is forced to pass through the conical cylinder to form a rotating vortex, and the granular sludge and flocculent sludge are forced to gather to the pipe wall under the action of centrifugal force, while the liquid is accumulated at the liquid surface in the center of the pipe, and is separated and discharged from two different outlets of the device as the fluid continuously moves forward along the circular pipe, the solid particles flow out of the bottom outlet and enter the liquid inlet device 40 to flow into the reactor body 10 together with the new wastewater, and the liquid flows out of the top outlet to enter the next process for treatment.

[0032] In an embodiment, the separation device 50 further comprises a second water outlet pipe 54, one end of the second water outlet pipe 54 being connected to the second water outlet of the separator 51, for leading the water separated by the separator 51 out. In this way, the water separated by the separator 51 can be led out of the box body through the second water outlet pipe 54 for storage.

[0033] In an embodiment, the circulation pipe 53 is respectively provided with a first flow meter 55 and a first control valve 56, the first water outlet pipe 52 is provided with a second control valve 57, and / or the second water outlet pipe 54 is respectively provided with a second flow meter 58 and a third control valve 59.

[0034] It should be noted that the term "and / or", only describes the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects. Specifically in the present embodiment, the first flow meter 55 on the circulation pipe 53 can count the amount of mixed liquid flowing through to facilitate the staff to record and process. Similarly, the second flow meter 58 is arranged on the second water outlet pipe 54, and the second flow meter 58 is used to count the water flowing through the second water outlet pipe 54, so as to facilitate the staff to record and process. In addition, the first control valve 56 is also arranged on the circulation pipe 53, and the first control valve 56 is used to control the on-off of the circulation pipe 53, so that the separated mixed liquid can be returned to the water inlet pipe 41 as needed and flow to the water distributor 42 together with the new wastewater, and finally sprayed out to the anoxic zone 11 through the water distribution holes 42a of the water distributor 42. The third control valve 59 is also arranged on the second water outlet pipe 54, and the third control valve 59 is used to control the on-off of the second water outlet pipe 54, so that the separated water can be controlled to flow out and enter the next process.

[0035] In one embodiment, the liquid inlet device 40 comprises a water inlet pipe 41, a water distributor 42 and a power pump 43. The water distributor 42 is arranged at least partially in the reactor body 10 and located in the anoxic zone 11. One end of the water distributor 42 penetrates out of the reactor body 10 and is connected to one end of the water inlet pipe 41. The other end of the water inlet pipe 41 is used to connect an external water source. The water inlet pipe 41 is in communication with the circulation pipe 53. The part of the water distributor 42 located in the reactor body 10 is provided with water distribution holes 42a. The power pump 43 is arranged on the water inlet pipe 41 and used to pump the liquid to be treated into the reactor body 10.

[0036] For example, one end of the water inlet pipe 41 is connected to the end of the water distributor 42 penetrating out of the reactor. The other end of the water inlet pipe 41 is connected to a storage tank storing wastewater. The wastewater in the storage tank is the mixed liquid after the front-end treatment. Then, under the action of the power pump 43, the wastewater in the storage tank flows into the water distributor 42 through the water inlet pipe 41, and then is uniformly dispersed into the inside of the reactor body 10 through the plurality of water distribution holes 42a, thereby realizing automatic pumping of the wastewater to be treated into the reactor body 10. Since the water distributor 42 is arranged in the anoxic zone 11, and the wastewater flowing into the water distributor 42 is sprayed out through the plurality of water distribution holes 42a and fully contacts with the anaerobic bacterial granular sludge in the anoxic zone 11, the denitrification effect can be effectively improved.

[0037] In addition, the reactor body 10 is generally cylindrical or cuboid. In order to install the water distributor 42 in the reactor body 10, it is necessary to make corresponding arrangements according to different shapes of the reactor body 10, for example, referring to Figure 2When the reactor body 10 is cylindrical, the water distributor 42 comprises a mounting frame 421, a first water distribution pipe 423, and a plurality of second water distribution pipes 422. The plurality of second water distribution pipes 422 are arranged in a transverse direction and are spaced apart. The first water distribution pipe 423 is arranged across the plurality of longitudinal water distribution pipes. One end of the first water distribution pipe 423 extends outwardly to the outside of the mounting frame 421 and penetrates out of the reactor body 10 to be connected to the water inlet pipe 41. The first water distribution pipe 423 is in communication with all the second water distribution pipes 422. The first water distribution pipe 423 and all the second water distribution pipes 422 are provided with water distribution holes 42a on the surface of the bottom of the reactor body 10. That is, after the wastewater flows into the first water distribution pipe 423 from the water inlet pipe 41, the wastewater in the first water distribution pipe 423 flows to the plurality of second water distribution pipes 422, and then is uniformly sprayed to the aerobic zone 12 through the water distribution holes 42a on the first water distribution pipe 423 and the plurality of water distribution pipes, so as to fully contact with the anaerobic bacterial granular sludge in the anoxic zone 11, thereby effectively improving the denitrification effect. It should be noted that the first water distribution pipe 423 and the second water distribution pipe 422 can be fixedly connected to the mounting frame 421 by welding, but are not limited thereto.

[0038] In an embodiment, the water inlet pipe 41 is respectively provided with a third flow meter 44, a fourth control valve 45, and a check valve 46. In this way, the amount of wastewater flowing into the reactor body 10 can be counted by the third flow meter 44, so as to facilitate the staff to record the amount of wastewater treated. The fourth control valve 45 is used to control the on-off of the water inlet pipe 41, so as to control the wastewater flowing into the reactor body 10. The check valve 46 is arranged to ensure that the incoming wastewater flows in a single direction (i.e. the direction of flowing into the reactor body 10) and does not flow in the opposite direction.

[0039] In an embodiment, the aeration device 30 comprises an aeration pipe 31 and a plurality of aeration heads 32. The aeration pipe 31 is at least partially inserted into the reactor body 10 and located in the aerobic zone 12. The aeration heads 32 are connected to the aeration pipe 31 in the reactor body 10. One end of the aeration pipe 31 outside the reactor body 10 is used to connect an aeration pump or an aeration fan.

[0040] Exemplarily, the wastewater to be treated is introduced into the reactor body 10 by the water inlet device, and as the wastewater is continuously introduced, the water level rises, at which time the aerobic bacteria (e.g. nitrite bacteria) inoculated in the aerobic zone 12 will perform aerobic biological denitrification on part of the ammonia nitrogen in the wastewater, but in order to maintain the survival of the aerobic bacteria in the aerobic zone 12, oxygen needs to be provided to it. To this end, in the present embodiment, the aeration pipe 31 is at least partially inserted into the reactor body 10 and located in the aerobic zone 12, and an aeration pump or aeration fan is connected to the end of the aeration pipe 31 located outside the reactor body 10 to pump air into the aeration pipe 31, which is then diffused to the aerobic zone 12 through the plurality of aeration heads 32, thereby providing the aerobic bacteria in the aerobic zone 12 with the oxygen required for survival, ensuring that the wastewater denitrification efficiency can be improved.

[0041] In actual application, a support with a hollow structure is provided in the aerobic zone 12 to allow the wastewater to pass through normally, and the aeration pipe 31 inserted into the reactor body 10 is fixed on the support to prevent the aeration pipe 31 from swinging randomly with the flow of wastewater, causing poor aeration effect. In addition, the upper surface of the aeration head 32 in the height direction is provided with micropores, so that the air blown out forms micro-bubbles that rise upward, thereby being consistent with the upward direction of the water flow, ensuring that the water flow can be fully disturbed, while also improving the upward flow rate.

[0042] In one embodiment, the denitrification reactor further comprises a sampling pipe 60 provided outside the reactor body 10, the sampling pipe 60 being in communication with the reactor body 10 for sampling from the aerobic zone 12 and the anoxic zone 11, and the sampling pipe 60 is further provided with a fifth control valve 70. That is, when it is necessary to understand the denitrification situation in the reactor body 10, it is necessary to take part of the samples from the aerobic zone 12 and the anoxic zone 11 for detection, and then the corresponding denitrification situation is obtained according to the nitrogen content in the samples. To this end, the present embodiment provides the sampling pipe 60 outside the reactor body 10, and utilizes a plurality of branch pipes in communication with the sampling pipe 60, the plurality of branch pipes being in communication with the aerobic zone 12 and the anoxic zone 11 respectively, so that the corresponding samples can be taken from the aerobic zone 12 and the anoxic zone 11, thereby allowing the staff to timely understand the denitrification situation in the reactor body 10.

[0043] In order to facilitate the maintenance of the aeration pipe 31 or the water distribution hole 42a of the water distributor 42 inside the reactor body 10, in an embodiment, a plurality of maintenance openings 80 are arranged on the surface of the reactor body 10. In practical application, two maintenance openings 80 are arranged, which are a first maintenance opening 80 and a second maintenance opening 80. The first maintenance opening 80 is used for the maintenance of the water distributor 42 located in the anoxic zone 11, and the second maintenance opening 80 is used for the maintenance of the aeration pipe 31 located in the aerobic zone 12. For example, if the water distribution hole 42a of the water distributor 42 is blocked, the corresponding water distribution hole 42a of the water distributor 42 can be treated in time through the first maintenance opening 80, so as to ensure that the wastewater to be treated can normally enter into the reactor body 10 for treatment.

[0044] The above description is only preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A denitrification reactor, characterized by, The denitrification reactor comprises: a reactor body, an inside of which is divided into an anoxic zone, an aerobic zone and a water outlet zone from bottom to top along a height direction, the water outlet zone is provided with a water outlet weir, and a water collecting groove is formed between the water outlet weir and an inner wall of the reactor body; an aeration device arranged in the inside of the reactor body and located in the aerobic zone; a liquid inlet device, an outlet end of which communicates with the anoxic zone, for feeding liquid to be treated into the reactor body for reaction; a separation device located outside the reactor body, an inlet end of the separation device communicating with the water collecting groove, for separating the liquid treated by the aerobic zone and the anoxic zone and returning the separated mixed liquid to the reactor body.

2. The denitrification reactor of claim 1, wherein The separation device comprises a separator, a circulation pipe and a first water outlet pipe, one end of the first water outlet pipe communicating with the water collecting groove, the other end of the first water outlet pipe communicating with a water inlet of the separator, a first water outlet of the separator communicating with one end of the circulation pipe, and the other end of the circulation pipe communicating with the liquid inlet device to return the mixed liquid separated by the separator to the reactor body.

3. The denitrification reactor of claim 2, wherein, The separation device further comprises a second water outlet pipe, one end of the second water outlet pipe communicating with a second water outlet of the separator for guiding the water separated by the separator out.

4. The denitrification reactor of claim 3, wherein The circulation pipe is respectively provided with a first flow meter and a first control valve, and the first water outlet pipe is provided with a second control valve.

5. The denitrification reactor of claim 3, wherein The second water outlet pipe is respectively provided with a second flow meter and a third control valve.

6. The denitrification reactor of claim 2, wherein, The liquid inlet device comprises a water inlet pipe, a water distributor and a power pump, the water distributor being arranged at least partially in the reactor body and located in the anoxic zone, one end of the water distributor penetrating out of the reactor body and connected with one end of the water inlet pipe, the other end of the water inlet pipe being used for connecting an external water source, the water inlet pipe communicating with the circulation pipe, the part of the water distributor located in the reactor body being provided with water distribution holes at intervals, and the power pump being arranged on the water inlet pipe for pumping the liquid to be treated into the reactor body.

7. The denitrification reactor of claim 6, wherein The water inlet pipe is respectively provided with a third flow meter, a fourth control valve and a check valve.

8. The denitrification reactor of claim 1, wherein, The aeration device comprises an aeration pipe and a plurality of aeration heads, the aeration pipe being arranged at least partially in the reactor body and located in the aerobic zone, and the aeration heads being connected with the aeration pipe at intervals, one end of the aeration pipe located outside the reactor body being used for connecting an aeration pump or an aeration fan.

9. The denitrification reactor according to any one of claims 1 to 8, characterized in that The denitrification reactor further comprises a sampling pipe arranged outside the reactor body, the sampling pipe communicating with the reactor body for sampling from the aerobic zone and the anoxic zone, and the sampling pipe is further provided with a fifth control valve.

10. The denitrification reactor of claim 1, wherein, The reactor body is provided with a plurality of manholes on a surface thereof.

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