Anaerobic denitrification tower

Abstract

The anaerobic denitrification tower comprises a treatment tower, a three-phase separator and a gas-water separation tank, the three-phase separator is installed in the treatment tower and located on the middle-upper portion of the treatment tower, and the gas-water separation tank is installed on the top of the treatment tower and located on the middle-upper portion of the treatment tower. A biogas collecting pipeline of the three-phase separator is connected with a gas inlet of the gas-water separation tank, and a gas outlet pipe is arranged at the top of the gas-water separation tank; a plurality of filler layers are arranged in the treatment tower and below the three-phase separator at intervals; a space between the three-phase separator and the packing layer is communicated with a space below the packing layer through a circulating pipeline, so that gas-liquid circulating flow at the upper part and the lower part in the treatment tower is realized; a gas stripping device is arranged outside the treatment tower, the gas stripping device is respectively communicated with a pipeline, positioned outside the treatment tower, of the biogas collection pipeline through a gas pipeline, and the gas stripping device is used for intermittently introducing air into the biogas collection pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of anaerobic sewage treatment, and particularly relates to an anaerobic denitrification tower. Background Technique

[0002] As an effective wastewater treatment method, anaerobic denitrification technology has shown its unique advantages in treating high-concentration organic wastewater. As the core equipment of anaerobic denitrification technology, the working principle of the anaerobic denitrification tower is to decompose organic substances in wastewater into harmless substances such as methane and carbon dioxide through the metabolic action of anaerobic microorganisms under anaerobic or low-oxygen conditions, while achieving the purpose of denitrification.

[0003] There are some problems in the actual application process of traditional upflow anaerobic denitrification towers. For example, the power of the biogas collection pipeline is insufficient, which affects the effective collection and utilization of biogas and reduces the overall treatment efficiency of the equipment. In addition, the treatment capacity of traditional equipment is limited, and the treatment effect on industrial wastewater with high salinity, high toxicity, high nitrate nitrogen and large water quality fluctuations is not good, which limits its application range.

[0004] Therefore, it is necessary to provide an anaerobic denitrification tower to solve the problems mentioned in the above background technique. Content of the Utility Model

[0005] To achieve the above object, the utility model provides the following technical solution: An anaerobic denitrification tower, comprising: a treatment tower, a three-phase separator and a gas-liquid separation tank. The three-phase separator is installed in the treatment tower and is located in the upper-middle part of the treatment tower. The gas-liquid separation tank is installed on the top of the treatment tower. The biogas collection pipeline of the three-phase separator is connected to the air inlet of the gas-liquid separation tank, and an air outlet pipe is arranged on the top of the gas-liquid separation tank;

[0006] A plurality of packing layers are arranged at intervals below the three-phase separator inside the treatment tower; the space between the three-phase separator and the packing layer is communicated with the space below the packing layer through a circulation pipeline to realize the up-and-down gas-liquid circulation flow inside the treatment tower;

[0007] An air-lift device is arranged outside the treatment tower. The air-lift device is respectively communicated with the pipeline of the biogas collection pipeline located outside the treatment tower through a gas pipeline. The air-lift device is used for intermittently introducing air into the biogas collection pipeline.

[0008] As a preferred technical solution of the utility model, the packing layer is filled with MBBR packing, and a grid is arranged above each packing layer.

[0009] As a preferred technical solution of the present utility model, a water collecting pipe is arranged at the bottom of the treatment tower through the tower body. The liquid outlet end of the circulating pipeline is communicated with the external pipeline of the water collecting pipe. One end of the water collecting pipe located inside the tower is connected with a water distribution pipe, and a plurality of water outlet holes are evenly formed in the water distribution pipe for evenly distributing water to the bottom of the treatment tower.

[0010] As a preferred technical solution of the present utility model, a branch pipeline is arranged on the gas pipeline, and the branch pipeline is connected with the water collecting pipe and the liquid outlet end of the circulating pipeline through a three-way valve.

[0011] As a preferred technical solution of the present utility model, each biogas collection pipeline at least comprises two branch pipes, and the branch pipes of each biogas collection pipeline are horizontally arranged at equal angles between the connection points with the gas-liquid separation tank, and each branch pipe is tangentially penetrated and arranged with the gas-liquid separation tank.

[0012] As a preferred technical solution of the present utility model, a water seal tank is arranged at the top of the treatment tower, and the gas outlet pipe of the gas-liquid separation tank is connected with the water inlet of the water seal tank.

[0013] As a preferred technical solution of the present utility model, a reflux pipe is installed at the bottom of the gas-liquid separation tank, the reflux pipe penetrates through the tower body of the treatment tower and extends to the inner bottom thereof, and the position of the outlet of the reflux pipe is higher than the positions of the inner bottom of the treatment tower and the circulating pipeline.

[0014] As a preferred technical solution of the present utility model, a sludge concentration detector MLSS, an oxidation-reduction potential detector ORP and an ammonia nitrogen sensor TN are further arranged in the treatment tower.

[0015] As a preferred technical solution of the present utility model, an overflow weir is annularly arranged at the top inside the treatment tower, and the water flowing out from the overflow weir is discharged out of the tower through a water outlet pipe.

[0016] Compared with the prior art, the present utility model provides an anaerobic denitrification tower, which has the following beneficial effects:

[0017] In the present utility model, an air-lift device and a gas pipeline are arranged to intermittently introduce air into the biogas collection pipeline and the circulating pipeline. On the one hand, it provides sufficient power for the gas-liquid mixture to enter the gas-liquid separation tank, improves the separation effect of the gas-liquid separation tank, and overcomes the problem of insufficient power in the biogas collection pipeline of traditional equipment. On the other hand, air is intermittently introduced into the circulating pipeline and discharged through the water collecting pipe to blow the water outlet of the water distribution pipe to prevent blockage.

[0018] And a plurality of layers of MBBR fillers are arranged in the treatment tower, and microorganisms can grow on them to form a biological film, which enhances the treatment capacity, impact resistance and low-temperature resistance of the equipment. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of the overall structure of an anaerobic denitrification tower;

[0020] Figure 2 It is a schematic top view structure diagram of the gas-liquid separation tank and the biogas collection pipeline in an anaerobic denitrification tower;

[0021] In the figure: 1. Treatment tower; 2. Three-phase separator; 3. Packing layer; 4. Gas-liquid separation tank; 41. Return pipe; 5. Biogas collection pipeline; 6. Air-lift device; 61. Gas pipeline; 7. Circulation pipeline; 71. Circulation pump; 8. Water collection pipe; 9. Water seal tank; 10. Grid; 11. MLSS; 12. ORP; 13. TN; 14. Overflow weir. Detailed Embodiments

[0022] Please refer to Figure 1-2 , the present utility model provides an anaerobic denitrification tower, comprising: a treatment tower 1, a three-phase separator 2 and a gas-liquid separation tank 4. It is characterized in that the three-phase separator 2 is installed in the treatment tower 1 and is located in the upper-middle part of the treatment tower 1. The gas-liquid separation tank 4 is installed at the top of the treatment tower 1. The biogas collection pipeline 5 of the three-phase separator 2 is connected to the air inlet of the gas-liquid separation tank 4, and an air outlet pipe is arranged at the top of the gas-liquid separation tank 4;

[0023] A plurality of packing layers 3 are arranged at intervals below the three-phase separator 2 inside the treatment tower 1; the space between the three-phase separator 2 and the packing layer 3 is communicated with the space below the packing layer 3 through a circulation pipeline 7 to realize the up-and-down gas-liquid circulation flow inside the treatment tower 1;

[0024] An air-lift device 6 is arranged outside the treatment tower 1. The air-lift device 6 is respectively communicated with the pipeline of the biogas collection pipeline 5 outside the treatment tower 1 through a gas pipeline 61. The air-lift device 6 is used to intermittently introduce air into the biogas collection pipeline 5.

[0025] Specifically, the circulation pump 71 drives the gas-liquid to circulate up and down in the treatment tower 1. Organic matter is decomposed by microorganisms to produce biogas, and the pressure in the treatment tower 1 increases. By utilizing the pressure difference between the inside of the treatment tower 1 and the inside of the gas-water separation tank 4, the gas-liquid mixture enters the gas-water separation tank 4 through the three-phase separator 2 via the biogas collection pipeline 5 for gas-water separation. Among them, since the biogas collection pipeline 5 is tangentially connected to the gas-water separation tank 4, the gas-liquid mixture performs a swirling motion in the gas-water separation tank 4, which is beneficial to improving the gas-water separation effect. The mixed liquid gas is discharged from the upper part, and the liquid flows back into the treatment tower 1. In addition, air is introduced into the biogas collection pipeline 5 through the air-lift device 6, the speed of the gas-liquid mixture in the biogas collection pipeline 5 increases, overcoming the problem of insufficient power in the biogas collection pipeline 5 of traditional equipment, and reducing the clogging probability of the three-phase separator 2.

[0026] In this embodiment, the packing layer 3 is filled with MBBR packing, and a grid 10 is arranged above each packing layer 3.

[0027] Among them, a packing layer 3 is arranged in the treatment tower 1 and MBBR packing is filled in the packing layer 3, creating favorable attachment conditions for the screening and enrichment of microorganisms, thereby strengthening the activity performance of microorganisms and weakening the highly toxic side effects of high salinity, load fluctuations, etc. on denitrifying microorganisms in industrial wastewater. By setting the grid 10 to filter the gas-liquid mixture flowing towards the three-phase separator 2, the packing is prevented from clogging the three-phase separator 2, and the treatment capacity, shock resistance and low-temperature resistance of the equipment are improved.

[0028] Preferably, the MBBR packing is not fixed in the tower body. The specific gravity of the MBBR packing is close to that of water, and its shape is mainly cylindrical and spherical, with the characteristics of being easy to form a biofilm, not agglomerating, not clogging, and easy to strip the biofilm.

[0029] Specifically, the air-lift device 6 at least includes: a fan and a connecting pipeline. The gas is pressurized by the fan and enters the treatment tower 1 and the biogas collection pipeline 5 through the branch pipeline.

[0030] In this embodiment, a water collection pipe 8 is arranged through the tower body at the bottom of the treatment tower 1. The liquid outlet end of the circulation pipeline 7 is communicated with the external pipeline of the water collection pipe 8. One end of the water collection pipe 8 located inside the tower is connected with a water distribution pipe, and a plurality of water outlet holes are evenly arranged on the water distribution pipe for uniformly distributing water to the bottom of the treatment tower 1.

[0031] In this embodiment, the gas pipeline 61 is provided with a branch pipeline, and the branch pipeline is connected to the water collection pipe 8 and the liquid outlet end of the circulation pipeline 7 through a three-way valve.

[0032] Specifically, water is dispersed and distributed to the bottom inside the treatment tower 1 through the water collecting pipe 8 and the water distributing pipe. Meanwhile, air is introduced into the water collecting pipe 8 through the branch pipe to purge the water outlet holes of the water collecting pipe 8 to prevent blockage.

[0033] It should be noted that one-way valves are provided on both the gas pipeline 61 and the branch pipe for one-way gas supply to the treatment tower 1 or the biogas collection pipeline 5. The gas supply mode of the air-lift device 6 is intermittent gas supply.

[0034] In this embodiment, as Figure 2 shown, each of the biogas collection pipelines 5 includes at least two branch pipes, and the branch pipes of each of the biogas collection pipelines 5 are horizontally arranged at equal angles between the connection points with the gas-liquid separation tank 4, and each of the branch pipes is tangentially and penetratingly arranged with the gas-liquid separation tank 4.

[0035] Specifically, by arranging the branch pipes to be tangentially and penetratingly connected with the gas-liquid separation tank 4, the incoming gas-liquid mixture moves spirally downward along the tank wall. At the same time, the gas-liquid mixtures of each branch pipe are horizontally arranged at equal angles and can push each other, further improving the efficiency of gas-liquid separation and increasing the return power of the separated sewage in the separation tank.

[0036] In this embodiment, a water seal tank 9 is provided at the top of the treatment tower 1, and the gas outlet pipe of the gas-liquid separation tank 4 is connected to the water inlet of the water seal tank 9, which is used to remove the moisture in the biogas separated by the gas-liquid separation tank 4. The water seal tank 9 is provided with a gas outlet for collecting biogas.

[0037] In this embodiment, a return pipe 41 is installed at the bottom of the gas-liquid separation tank 4. The return pipe 41 penetrates through the tower body of the treatment tower 1 and extends to its inner bottom. The position of the outlet of the return pipe 41 is higher than the positions of the inner bottom of the treatment tower 1 and the circulation pipeline 7.

[0038] Among them, a fixing frame is provided at the bottom of the treatment tower 1, and the fixing frame is used to support and fix the return pipe 41. The liquid separated by the gas-liquid separation tank 4 enters the treatment tower 1 from its bottom for reflux. Due to the increase in the speed of the gas-liquid mixture, the effect of the gas-liquid separation tank 4 is also increased, and the reflux of the separated sewage is smoother.

[0039] In this embodiment, a sludge concentration detector MLSS11, an oxidation-reduction potential detector ORP12, and an ammonia nitrogen sensor TN13 are also provided inside the treatment tower 1, which is convenient for automatically controlling the concentration of microbial sludge substrate and the water inflow of the water collecting pipe 8.

[0040] Specifically, the sludge concentration detector MLSS11 is used to monitor the sludge concentration at the bottom of the treatment tower 1. The oxidation-reduction potential detector ORP12 is used to monitor the process conditions of microbial treatment in the tower body, such as the degradation of organic matter, nitrification and denitrification, etc. According to the change of the ORP value, the operating parameters of the biogas tank, such as temperature, pH value, aeration volume, etc., can be adjusted to optimize the biological treatment process and increase the biogas production. The ammonia nitrogen sensor TN13 is used to measure the ammonia nitrogen concentration in the water body of the biogas tank. By monitoring the ammonia nitrogen concentration and the ORP value in real time, problems can be discovered and solved in time, ensuring the stability and sustainability of biogas production.

[0041] In this embodiment, an overflow weir 14 is annularly arranged at the top inside the treatment tower 1, and the water discharged from the overflow weir 14 is discharged out of the tower body through a water outlet pipe, which is used to maintain the uniform distribution of the liquid in the tower and prevent the liquid from overflowing.

[0042] During specific implementation, sewage is regularly introduced into the treatment tower through a water collecting pipe, and the circulation pump is started to drive the gas-liquid mixture in the upper and lower parts of the treatment tower to circulate. The gas-liquid mixture flows through the biogas collection pipeline through the three-phase separator and enters the gas-liquid separation tank for gas-liquid separation. Herein, air is introduced into the biogas collection pipeline and the circulation pipeline through an air-lift device to increase the flow rate of the gas-water mixture, overcoming the problem of insufficient power in the biogas collection pipeline of traditional equipment. And by filling MBBR fillers in the packing layer in the treatment tower, conditions favorable for attachment are created for the screening and enrichment of microorganisms, thereby strengthening the activity performance of microorganisms and improving the treatment capacity of the equipment.

[0043] The above is only the preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent replacements or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. An anaerobic denitrification tower, comprising: A treatment tower (1), a three-phase separator (2) and a gas-water separation tank (4), characterized in that the three-phase separator (2) is installed in the treatment tower (1) and is located in the upper middle part of the treatment tower (1), the gas-water separation tank (4) is installed on the top of the treatment tower (1), the biogas collection pipe (5) of the three-phase separator (2) is connected to the air inlet of the gas-water separation tank (4), and the top of the gas-water separation tank (4) is provided with an air outlet pipe; Multiple packing layers (3) are arranged at intervals below the three-phase separator (2) inside the treatment tower (1); the space between the three-phase separator (2) and the packing layer (3) is connected to the space below the packing layer (3) through a circulation pipeline (7), so that gas and liquid circulate in the upper and lower parts of the treatment tower (1); A gas stripping device (6) is arranged outside the treatment tower (1), and the gas stripping device (6) is connected to the pipeline of the biogas collection pipeline (5) located outside the treatment tower (1) through a gas pipeline (61). The gas stripping device (6) is used to intermittently introduce air into the biogas collection pipeline (5).

2. The anaerobic denitrification tower according to claim 1, characterized in that: The packing layers (3) are filled with MBBR fillers, and a grid (10) is arranged above each packing layer (3).

3. An anaerobic denitrification tower according to claim 2, characterized in that: A water collecting pipe (8) is provided at the bottom of the treatment tower (1) and passes through the tower body. The liquid outlet end of the circulation pipeline (7) is connected to the external pipeline of the water collecting pipe (8). One end of the water collecting pipe (8) located inside the tower is connected to a water distribution pipe. A plurality of water outlet holes are evenly provided on the water distribution pipe for evenly distributing water to the bottom of the treatment tower (1).

4. The anaerobic denitrification tower according to claim 3, characterized in that: The gas pipeline (61) is provided with a branch pipeline, and the branch pipeline is connected to the water collecting pipe (8) and the liquid outlet end of the circulation pipeline (7) through a three-way valve.

5. The anaerobic denitrification tower according to claim 1, characterized in that: Each of the biogas collection pipes (5) comprises at least two branch pipes, and the branch pipes of each of the biogas collection pipes (5) are arranged horizontally at equal angles with each connection point of the gas-water separation tank (4), and each of the branch pipes is arranged tangentially and through the gas-water separation tank (4).

6. The anaerobic denitrification tower according to claim 1, characterized in that: A water seal tank (9) is arranged on the top of the treatment tower (1), and the air outlet pipe of the air-water separation tank (4) is connected to the water inlet of the water seal tank (9).

7. The anaerobic denitrification tower according to claim 1, characterized in that: A reflux pipe (41) is installed at the bottom of the gas-water separation tank (4), and the reflux pipe (41) passes through the tower body of the treatment tower (1) and extends to the inner bottom thereof. The outlet of the reflux pipe (41) is located at a position higher than the inner bottom of the treatment tower (1) and the position of the circulation pipe (7).

8. The anaerobic denitrification tower according to claim 1, characterized in that: The treatment tower (1) is also provided with a sludge concentration detector MLSS (11), an oxidation-reduction potential detector ORP (12) and an ammonia nitrogen sensor TN (13).

9. The anaerobic denitrification tower according to claim 1, characterized in that: An overflow weir (14) is provided in a ring shape at the top of the treatment tower (1), and water discharged from the overflow weir (14) is discharged out of the tower body through a water outlet pipe.

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