Deep denitrification sewage treatment system

Abstract

The utility model belongs to the technical field of sewage treatment equipment, and provides a deep nitrogen removal sewage treatment system which comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank and an autotrophic nitrogen removal filter tank which are connected in sequence, wherein the anaerobic tank is connected with the outlet end of the water inlet pump; a supporting layer and a sulfur autotrophic carrier filler layer are arranged in the middle of the autotrophic nitrogen removal filter, a water inlet and a backwashing water outlet of the autotrophic nitrogen removal filter are positioned above the sulfur autotrophic carrier filler layer, and a water outlet of the autotrophic nitrogen removal filter is positioned below the supporting layer; the liquid level meter, the backwashing water pump and the aeration fan are connected with the controller; the liquid level meter is arranged in the autotrophic nitrogen removal filter tank, and the outlet ends of the backwashing water pump and the aeration fan are connected to the lower part of a supporting layer in the autotrophic nitrogen removal filter tank. The system integrates heterotrophic denitrification and autotrophic denitrification to realize deep denitrification and filtration treatment, does not need to add a carbon source, can synchronously remove COD, ammonia nitrogen, TN, TP and SS, and effectively ensures the effluent quality.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment equipment, in particular to a deep denitrification sewage treatment system. Background Art

[0002] In the process of urban domestic sewage treatment, heterotrophic denitrification technology is often used for denitrification. The heterotrophic denitrification process is that denitrifying bacteria consume organic matter as electron donors under anoxic or anaerobic conditions to convert nitrate (NO 3- ) is reduced to nitrogen. In the sewage treatment process, there is often a lack of carbon sources (organic matter) in the wastewater. The existing sewage treatment system needs to add additional carbon sources to ensure the denitrification effect of the heterotrophic denitrification process, but the additional addition of carbon sources will increase the cost of sewage treatment and increase the amount of sludge. In addition, the existing heterotrophic denitrification technology sewage treatment system needs to monitor the water quality during the water treatment process and the effluent water quality in real time, and perform operations such as carbon source addition according to the changes in water quality to ensure the effluent quality. The sewage treatment and control process is cumbersome. Utility Model Content

[0003] In view of the defects of the above-mentioned prior art, the utility model provides a deep denitrification sewage treatment system, which integrates heterotrophic and autotrophic denitrification to achieve deep denitrification and filtration treatment without adding a carbon source, and can simultaneously remove COD, ammonia nitrogen, TN, TP and SS, effectively ensuring the effluent quality.

[0004] The technical solution adopted by the utility model is as follows:

[0005] A deep denitrification sewage treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank and an autotrophic denitrification filter tank which are connected in sequence;

[0006] Wherein, the anaerobic tank is connected to the outlet end of the water inlet pump;

[0007] A supporting layer and a sulfur autotrophic carrier filler layer are provided in the middle of the autotrophic denitrification filter tank, the water inlet and backwash outlet of the autotrophic denitrification filter tank are located above the sulfur autotrophic carrier filler layer, and the water outlet is located below the supporting layer;

[0008] It also includes a controller and a liquid level meter, a backwash water pump, and an aeration fan connected to the controller; the liquid level meter is arranged in the autotrophic denitrification filter tank, and the outlet ends of the backwash water pump and the aeration fan are both connected to the supporting layer in the autotrophic denitrification filter tank.

[0009] In one embodiment of the present application, a sludge return pipeline is further included, and the sludge return pipeline connects the bottom of the sedimentation tank and the inlet end of the anaerobic tank.

[0010] In one embodiment of the present application, a nitrification liquid reflux pipeline is further included, and the nitrification liquid reflux pipeline connects the outlet end of the aerobic tank and the inlet end of the anoxic tank.

[0011] In one embodiment of the present application, a suspended carrier is arranged in the aerobic pool, and nitrifying bacteria are attached to the suspended carrier.

[0012] In one embodiment of the present application, a water distributor is provided at the bottom of the autotrophic denitrification filter tank, and the water distributor is connected to the backwash water pump.

[0013] In one embodiment of the present application, a first air distribution pipe is provided at the bottom of the autotrophic denitrification filter tank, and the first air distribution pipe is connected to the aeration fan.

[0014] In one embodiment of the present application, it also includes an air wash valve, a backwash water inlet valve and a backwash water outlet valve connected to the controller, the air wash valve is arranged on the outlet pipe of the aeration fan, the backwash water inlet valve is arranged on the outlet pipe of the backwash water pump, and the backwash water outlet valve is arranged on the backwash water outlet pipe.

[0015] In one embodiment of the present application, a second air distribution pipe is provided at the bottom of the aerobic tank, and the second air distribution pipe is connected to the aeration fan via a pipeline;

[0016] And / or, a third air distribution pipe is provided at the bottom of the sedimentation tank, and the third air distribution pipe is connected to the aeration fan.

[0017] In one embodiment of the present application, a regulating tank is further included, wherein the regulating tank is connected to the wastewater inlet pipe and the inlet end of the water inlet pump.

[0018] In one embodiment of the present application, the regulating tank, water inlet pump, anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, autotrophic denitrification filter, backwash water pump, aeration fan and controller are integrated into an integrated arrangement.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The deep denitrification sewage treatment system of the utility model integrates heterotrophic and autotrophic denitrification to realize deep denitrification treatment, and the sulfur autotrophic carrier filler layer of the autotrophic denitrification filter tank also has a filtering function. No additional carbon source needs to be added during use, and COD, ammonia nitrogen, total nitrogen (TN), total phosphorus (TP) and suspended solids (SS) can be removed simultaneously to effectively ensure the effluent quality; in addition, a liquid level gauge is arranged in the autotrophic denitrification tank, and the liquid level gauge is linked with the backwash water pump and the aeration fan through a controller, and automatic backwashing operation can be realized through liquid level changes, which is convenient to use and maintain; for example, when the sulfur autotrophic carrier filler layer of the autotrophic denitrification filter tank is blocked, causing the liquid level to become high, the liquid level information is monitored by the liquid level gauge to trigger automatic backwashing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the process of a deep denitrification wastewater treatment system.

[0023] Figure 2 This is a schematic diagram of the structure of the autotrophic denitrification filter.

[0024] Reference numerals:

[0025] 1. Anaerobic tank; 11. Water inlet pump; 12. Regulating tank;

[0026] 2. Anoxic pool;

[0027] 3. Aerobic pool; 31. Nitration liquid return pipeline; 32. Second gas distribution pipe;

[0028] 4. Sedimentation tank; 41. Sludge return pipeline;

[0029] 5. Autotrophic denitrification filter tank; 51. Support layer; 52. Sulfur autotrophic carrier filler layer; 53. Backwash water outlet; 54. Liquid level meter; 55. Water distributor; 56. First air distribution pipe;

[0030] 6. Backwash water pump;

[0031] 7. Aeration fan;

[0032] 8. Controller. DETAILED DESCRIPTION

[0033] The described embodiments may be modified in various different ways without departing from the spirit or scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0034] In the description of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships conventionally placed when the product of the present invention is used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] The terms "install", "connect", "connect", "fix" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0039] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 As shown, an embodiment of the utility model provides a deep denitrification sewage treatment system, which includes an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a sedimentation tank 4 and an autotrophic denitrification filter tank 5 which are connected in sequence, and the sewage is treated in sequence through the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3, the sedimentation tank 4 and the autotrophic denitrification filter tank 5.

[0041] The anaerobic tank 2 is connected to the outlet end of the water inlet pump 11, and the water inlet pump 11 pumps the sewage to be treated into the anaerobic tank 1 and controls the water inlet flow rate.

[0042] like Figure 1 and Figure 2 As shown, a supporting layer 51 is arranged in the middle of the autotrophic denitrification filter 5, and a sulfur autotrophic filler layer 52 is arranged on the supporting layer 51; a water inlet and a backwash outlet 53 are arranged on the upper part of the sulfur autotrophic denitrification filter 5, and the water inlet and the backwash outlet 53 are both located above the sulfur autotrophic carrier filler layer 52; the water outlet of the sulfur autotrophic denitrification filter 5 is arranged at the lower part of the sulfur autotrophic denitrification filter 5, and is located below the supporting layer 51.

[0043] The supernatant after the sedimentation treatment in the sedimentation tank 4 enters the upper part of the sulfur autotrophic denitrification filter tank 5 through the water inlet, flows from top to bottom through the sulfur autotrophic carrier filler layer 52 and the supporting layer 51, and then enters the lower part of the sulfur autotrophic denitrification filter tank 5, and is then discharged from the water outlet to complete further denitrification and filtration treatment.

[0044] The system also includes a controller 8, a liquid level meter 54, a backwash water pump 6, an aeration fan 7, etc. The liquid level meter 54 is arranged in the autotrophic denitrification filter 5, preferably a drop-in liquid level meter, which can detect the liquid level change in the autotrophic denitrification filter 5 in real time, especially the liquid level change above the sulfur autotrophic carrier filler layer 52. The outlet ends of the backwash water pump 6 and the aeration fan 7 are connected to the support layer 51 in the autotrophic denitrification filter 5 through pipelines. The liquid level meter 54, the backwash water pump 6 and the aeration fan 7 are all connected to the controller 8, and the controller 8 controls the operation or shutdown of the backwash water pump 6 and the aeration fan 7 according to the liquid level change information detected by the liquid level meter 54, that is, the automatic backwashing can be controlled according to the change of the liquid level information.

[0045] The controller 8 is also connected to the water inlet pump 11. When the liquid level meter 54 detects that the liquid level rises to a set value and starts automatic backwashing, the controller 8 can control the water inlet pump 11 to shut down and stop water intake.

[0046] Furthermore, a water distributor 55 and a first air distribution pipe 56 are provided at the bottom of the autotrophic denitrification filter 5, and the water distributor 55 and the first air distribution pipe 56 are both located below the support layer 51. The water distributor 55 is connected to the outlet end of the backwash water pump 6, so that the backwash water flow is dispersed into the autotrophic denitrification filter 5, and the sulfur autotrophic carrier filler layer 52 can be flushed and backwashed more evenly. The first air distribution pipe 56 is connected to the outlet end of the aeration fan 7, so that the gas is dispersed and exposed in the autotrophic denitrification filter 5, and the sulfur autotrophic carrier filler layer 52 can be backwashed and air-washed or air-water combined backwashed.

[0047] It also includes an air washing valve, a backwash inlet valve and a backwash outlet valve (not shown in the figure). The air washing valve is arranged on the pipeline between the aeration fan 7 and the first air distribution pipe 56 to control the air washing air intake; the backwash inlet valve is arranged on the pipeline between the outlet end of the backwash water pump 6 and the water distributor 55 to control the backwash water intake; the backwash outlet valve is arranged on the pipeline of the backwash outlet 53 at the upper part of the autotrophic denitrification filter tank 5 to control the backwash water flow in the autotrophic denitrification filter tank 5 to be discharged from the upper part. The air washing valve, the backwash inlet valve and the backwash outlet valve are all connected to the controller 8, and are controlled to be opened or closed by the controller 8 to realize automatic backwashing.

[0048] like Figure 1 As shown, the system is also provided with a sludge return pipeline 41 and a nitrification liquid return pipeline 31. The sludge return pipeline 41 connects the bottom of the sedimentation tank 4 and the inlet end of the anaerobic tank 1. A sludge pump is arranged on the sludge return pipeline 41. Part of the sludge deposited in the sedimentation tank 4 is returned to the anaerobic tank 1 through the sludge pump to replenish the required activated sludge for the anaerobic tank 1. The nitrification liquid return pipeline 31 connects the outlet end of the aerobic tank 3 and the inlet end of the anoxic tank 2. A reflux pump is arranged on the nitrification liquid return pipeline 31. Part of the nitrification liquid output from the aerobic tank 3 is returned to the inlet end of the anoxic tank 2 through the reflux pump, so that the refluxed nitrification liquid and the sewage discharged from the anaerobic tank 1 are merged and enter the anoxic tank 2, which is more conducive to the heterotrophic denitrification reaction in the anoxic tank 2.

[0049] Suspended carriers are arranged in the aerobic pool 3, and nitrifying bacteria are attached to the suspended carriers. The wastewater treated in the anoxic pool 2 enters the aerobic pool 3 for further nitrification reaction to remove ammonia nitrogen under the action of nitrifying bacteria. The provision of suspended carriers attached to nitrifying bacteria can enable the bacteria to better contact and oxidize pollutants.

[0050] Preferably, a second air distribution pipe 32 is provided at the bottom of the aerobic pool 3, and the second air distribution pipe 32 is connected to the outlet end of the aeration fan 7 through a pipeline. A switch valve connected to the controller 8 is also provided on the pipeline connecting the second air distribution pipe 32 and the aeration fan 7, and the controller 8 controls aeration into the aerobic pool 3, so that the microorganisms in the aerobic pool 3 can better perform aerobic nitrification reaction.

[0051] A third air distribution pipe is arranged at the bottom of the sedimentation tank 4, and the third air distribution pipe is connected to the outlet end of the aeration fan 7 through a pipeline. That is, a multi-channel pipeline is arranged at the outlet end of the aeration fan 7, which is respectively connected to the first air distribution pipe 56, the second air distribution pipe 32 and the third air distribution pipe. In addition, a switch valve connected to the controller is also arranged on the pipeline connecting the third air distribution pipe and the aeration fan 7, and the controller 8 controls the backwashing and air washing of the sedimentation tank 4 to ensure the continuous and efficient operation of the sedimentation tank 4.

[0052] The aerobic tank 3, the sedimentation tank 4 and the autotrophic denitrification filter tank 5 share the aeration fan 7, so there is no conflict in their use and the equipment investment is saved.

[0053] It also includes a regulating tank 12, which is arranged at the front end and connected to the wastewater inlet pipe and the inlet end of the water inlet pump 11. The regulating tank 12 can mix and regulate the wastewater to be treated to ensure a continuous and stable supply of the wastewater to be treated, thereby providing a guarantee for the stable operation of the sewage treatment system.

[0054] In one embodiment, the regulating tank 12, the water inlet pump 11, the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3, the sedimentation tank 4, the autotrophic denitrification filter 5, the backwash water pump 6, the aeration fan 7 and the controller 8 are preferably integrated into an integrated device for easy installation and daily maintenance. Of course, only the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3, the sedimentation tank 4 and the autotrophic denitrification filter 5 can be integrated, and then the regulating tank 12, the water inlet pump 11, the backwash water pump 6, the aeration fan 7, the controller 8 and other equipment can be selected according to the on-site needs, which is more flexible and convenient to use.

[0055] The deep denitrification sewage treatment system of the utility model integrates heterotrophic and autotrophic denitrification, can realize deep denitrification treatment, and the sulfur autotrophic carrier filler layer 52 of the autotrophic denitrification filter 5 also has a filtering function, and no additional carbon source needs to be added during use, and COD, ammonia nitrogen, TN, TP and SS can be removed simultaneously, effectively ensuring the quality of effluent; in addition, a liquid level meter 54 is arranged in the autotrophic denitrification tank 5, and the liquid level meter 54 is linked with the backwash water pump 6 and the aeration fan 7 through the controller 8, and automatic backwashing operation can be realized through liquid level changes. For example, when the sulfur autotrophic carrier filler layer 52 of the autotrophic denitrification filter 5 is blocked, causing the liquid level to become high, the liquid level information monitored by the liquid level meter 54 can trigger automatic backwashing, and the front end water inlet can be closed in linkage, which is convenient for use and maintenance.

[0056] When the total nitrogen concentration of the influent is between 40-80 mg / L, the effluent treated by the sewage treatment system can stably reach the Class A standard, and the total nitrogen in the effluent is stably lower than 10 mg / L.

Claims

1. A deep denitrification wastewater treatment system, characterized in that: It includes an anaerobic tank (1), an anoxic tank (2), an aerobic tank (3), a sedimentation tank (4) and an autotrophic denitrification filter tank (5) which are connected in sequence; Wherein, the anaerobic tank (1) is connected to the outlet end of the water inlet pump (11); A supporting layer (51) and a sulfur autotrophic carrier filler layer (52) are provided in the middle of the autotrophic denitrification filter (5); a water inlet and a backwash water outlet (53) of the autotrophic denitrification filter (5) are located above the sulfur autotrophic carrier filler layer (52), and a water outlet is located below the supporting layer (51); It also comprises a controller (8) and a liquid level meter (54) connected to the controller (8), a backwash water pump (6), and an aeration fan (7); the liquid level meter (54) is arranged in the autotrophic denitrification filter tank (5), and the outlet ends of the backwash water pump (6) and the aeration fan (7) are both connected to below the supporting layer (51) in the autotrophic denitrification filter tank (5).

2. The deep denitrification wastewater treatment system according to claim 1, characterized in that: It also includes a sludge return pipeline (41), wherein the sludge return pipeline (41) connects the bottom of the sedimentation tank (4) and the inlet end of the anaerobic tank (1).

3. The deep denitrification wastewater treatment system according to claim 1 or 2, characterized in that: It also comprises a nitrification liquid return pipeline (31), wherein the nitrification liquid return pipeline (31) is connected to the outlet end of the aerobic tank (3) and the inlet end of the anoxic tank (2).

4. The deep denitrification wastewater treatment system according to claim 1, characterized in that: A suspended carrier is arranged in the aerobic pool (3), and nitrifying bacteria are attached to the suspended carrier.

5. The deep denitrification wastewater treatment system according to claim 1, characterized in that: A water distributor (55) is provided at the bottom of the autotrophic denitrification filter tank (5), and the water distributor (55) is connected to the backwash water pump (6).

6. The deep denitrification wastewater treatment system according to claim 1, characterized in that: A first air distribution pipe (56) is provided at the bottom of the autotrophic denitrification filter tank (5), and the first air distribution pipe (56) is connected to the aeration fan (7).

7. The deep denitrification wastewater treatment system according to any one of claims 1, 5 or 6, characterized in that: It also includes an air wash valve, a backwash water inlet valve and a backwash water outlet valve connected to the controller (8), the air wash valve being arranged on the outlet pipeline of the aeration fan (7), the backwash water inlet valve being arranged on the outlet pipeline of the backwash water pump (6), and the backwash water outlet valve being arranged on the backwash water outlet pipeline.

8. The deep denitrification wastewater treatment system according to claim 1 or 6, characterized in that: A second air distribution pipe (32) is provided at the bottom of the aerobic pool (3), and the second air distribution pipe (32) is connected to the aeration fan (7) via a pipeline; And / or, a third air distribution pipe is provided at the bottom of the sedimentation tank (4), and the third air distribution pipe is connected to the aeration fan (7).

9. The deep denitrification wastewater treatment system according to claim 1, characterized in that: It also comprises a regulating tank (12), wherein the regulating tank (12) is connected to the wastewater inlet pipe and the inlet end of the water inlet pump (11).

10. The deep denitrification wastewater treatment system according to claim 9, characterized in that: The regulating tank (12), the water inlet pump (11), the anaerobic tank (1), the anoxic tank (2), the aerobic tank (3), the sedimentation tank (4), the autotrophic denitrification filter (5), the backwash pump (6), the aeration fan (7) and the controller (8) are integrated into an integrated arrangement.

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