Transferable biological membrane autotrophic nitrogen removal equipment

Abstract

The utility model discloses transferable biological membrane autotrophic nitrogen removal equipment, and relates to the technical field of sewage treatment. Comprising a reaction tank, a stirring device and an aeration device, wherein the reaction tank comprises a first anoxic tank, a second anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are sequentially arranged from front to back; a main water inlet pipeline is arranged at the front end of the first anoxic tank; a main water outlet pipeline is arranged at the tail end of the third aerobic tank, two wall bodies are arranged at the tail ends of the first anoxic tank, the second anoxic tank, the first aerobic tank and the second aerobic tank in the direction perpendicular to water flow, rotating mechanisms are arranged between the two wall bodies, and suspended carriers flow into adjacent tank bodies by controlling the rotating mechanisms. The equipment disclosed by the utility model can realize enrichment starting of anaerobic ammonia oxidation on the basis of normal operation, and the quality of effluent in the migration process of a suspended carrier is always kept at the ammonia nitrogen lt; 0.5 mg / L and TN is less than 5mg / L.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a transportable biofilm autotrophic denitrification device. Background Art

[0002] At present, the sewage treatment process has problems such as high energy consumption of nitrification aeration and excessive addition of carbon source for denitrification. It is necessary to optimize and improve the existing sewage treatment process to achieve green and low-carbon sewage treatment.

[0003] Compared with traditional nitrification and denitrification, the anaerobic ammonium oxidation process can save more than 60% of aeration volume and 100% of carbon source addition, realizing green and low-carbon sewage treatment. However, it is currently mainly used in the treatment of high-ammonia nitrogen wastewater. When used in mainstream urban sewage treatment plants, it often faces the problems of low substrate concentration, large fluctuations in water quality, and low sewage temperature, which makes it difficult to enrich anaerobic ammonium oxidizing bacteria and a long startup cycle. After successful startup, anaerobic ammonium oxidizing bacteria also face the risk of continuous degradation, making it difficult to achieve long-term stable operation. Therefore, continuous inoculation is required. The existing technology generally uses pumps or manual methods to supplement the source of seeds. On the one hand, it will affect the stability of operation and the operation is very cumbersome; on the other hand, it may cause damage to the biological phase during the transfer process, affecting the subsequent inoculation effect. Utility Model Content

[0004] The utility model aims to provide a transportable biofilm autotrophic denitrification equipment, which can achieve stable retention of bacterial species in actual operation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A transportable biofilm autotrophic denitrification device comprises a reaction tank, a stirring device and an aeration device, wherein the reaction tank comprises a first anoxic tank, a second anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are arranged in sequence from front to back;

[0007] A total water inlet pipeline is provided at the front end of the first anoxic tank; a total water outlet pipeline is provided at the end of the third aerobic tank; the inlet water enters the first anoxic tank through the total water inlet pipeline, passes through the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank in sequence, and is discharged from the total water outlet pipeline;

[0008] A water passage is provided outside the first anoxic pool and the third aerobic pool for connecting the two.

[0009] Suspended carriers are added to the first anoxic pool, the second anoxic pool, the first aerobic pool, the second aerobic pool, and the third aerobic pool. Two walls are arranged at the ends of the first anoxic pool, the second anoxic pool, the first aerobic pool, and the second aerobic pool in a direction perpendicular to the water flow. A rotating mechanism is arranged between the two walls. The suspended carriers are controlled to flow into adjacent pools.

[0010] The rotating mechanism includes an intercepting screen, a rotating shaft and a driving mechanism. The rotating shaft is located in the axial direction of the intercepting screen. The driving mechanism is connected to the rotating shaft. The rotating shaft is driven to rotate by the driving mechanism, and the rotating shaft drives the intercepting screen to rotate.

[0011] In the above-mentioned transportable biofilm autotrophic denitrification equipment, when the intercepting screen rotates to form a certain angle with one of the walls, the suspended carrier can pass through.

[0012] The above-mentioned transportable biofilm autotrophic denitrification equipment is provided with a first water gate on the water gallery side of the first anoxic tank, a fixed interception screen is provided at the end of the third aerobic tank, and a second water gate and a third water gate are respectively provided on the front and rear water gallery sides of the fixed interception screen of the third aerobic tank.

[0013] The above-mentioned transportable biofilm autotrophic denitrification equipment is provided with a liftable water outlet weir behind the fixed interception screen of the third aerobic tank.

[0014] The above-mentioned transportable biofilm autotrophic denitrification equipment has a MLSS of suspended carriers in the first anoxic tank, the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank less than 500 mg / L, an average pore diameter of the suspended carrier greater than 5 mm, and a TN removal load greater than 1.0 N / m in the first anoxic tank and the second anoxic tank, respectively. 2 / d, 0.5gN / m 2 / d, the ammonia oxidation load of the first aerobic pool is greater than 1.0gN / m 2 / d, TN removal load greater than 0.1gN / m 2 / d.

[0015] In the above-mentioned transportable biofilm autotrophic denitrification equipment, the stirring device in the third aerobic tank is installed on the opposite side of the second water gate.

[0016] Compared with the prior art, the utility model brings the following beneficial technical effects:

[0017] The utility model proposes a transportable biofilm autotrophic denitrification equipment, in which two walls are arranged at the ends of a first anoxic tank, a second anoxic tank, a first aerobic tank and a second aerobic tank in a direction perpendicular to the water flow, and a rotating mechanism is arranged between the two walls. The rotating mechanism can rotate to make the suspended carrier in the corresponding tank body flow to the adjacent tank body, thereby avoiding the influence of the existing technology of adding the suspended carrier by salvaging to affect the operation of the system.

[0018] In the rotating mechanism, the two ends of the intercepting screen are fixed on two walls, and a rotating shaft is set from bottom to top in the middle of the intercepting screen. The rotating shaft is driven by the driving mechanism to rotate, which can drive the intercepting screen to rotate. When the intercepting screen is consistent with the direction of water flow, the suspended carrier can completely pass into the adjacent pool body.

[0019] The equipment of the utility model can realize the enrichment start-up of anaerobic ammonia oxidation on the basis of normal operation. The effluent water quality in the suspended carrier migration process always maintains the high standard of ammonia nitrogen <0.5mg / L and TN <5mg / L, which reduces the time, equipment and labor costs of anaerobic ammonia oxidation startup and avoids water quality exceeding the standard or reduced operation due to the startup of anaerobic ammonia oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the equipment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the intercepting screen of the utility model;

[0023] Figure 3 This is a schematic diagram of the rotating state of the intercepting screen of the utility model;

[0024] In the figure:

[0025] I, the first anoxic pool, II, the second anoxic pool, III, the first aerobic pool, IV, the second aerobic pool, V, the third aerobic pool, I1, the main water inlet pipeline, I2, the main water outlet pipeline, S1, the interception screen of the first anoxic pool, S2, the interception screen of the second anoxic pool, S3, the interception screen of the first aerobic pool, S4, the interception screen of the second aerobic pool, S5, the interception screen of the third aerobic pool, f1, the first water gate, f2, the second water gate, f3, the third water gate, J, the stirring device, g, the water gallery, Y, the liftable water outlet weir. DETAILED DESCRIPTION

[0026] The utility model proposes a transportable biofilm autotrophic denitrification equipment. In order to make the advantages and technical solutions of the utility model clearer and more specific, the utility model is further described below in conjunction with specific embodiments.

[0027] In the description of this application, words such as "first" and "second" are only used to distinguish different objects, and do not limit the quantity and execution order, and words such as "first" and "second" do not necessarily limit differences. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0028] The structures and operating principles of the stirring device, aeration device, rotating shaft, and driving mechanism described in the present invention can be implemented by those skilled in the art with reference to the existing technology.

[0029] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0030] like Figure 1 As shown, the utility model is a portable biofilm autotrophic denitrification equipment, including a reaction tank, a stirring device and an aeration device. The stirring device and the aeration device can be selectively installed in the reaction tank. As known to those skilled in the art, the stirring device installed in the reaction tank is an anoxic tank, and the aeration device installed is an aerobic tank. The utility model installs a stirring device in the first anoxic tank and the second anoxic tank, and installs an aeration device in the first aerobic tank, the second aerobic tank and the third aerobic tank.

[0031] The design of the reaction pool is a major improvement of the utility model, including the first anoxic pool I, the second anoxic pool II, the first aerobic pool III, the second aerobic pool IV and the third aerobic pool V arranged in sequence from front to back. Such a design can ensure that the effluent is stable and meets the standards. For example, biofilm formation in the first aerobic pool is completed, providing conditions for biofilm formation in the second aerobic pool and the third aerobic pool; in the process of strengthening the thickness of aerobic biofilm, biofilm strengthening and biofilm formation in the second aerobic pool and the third aerobic pool are carried out, and the enrichment of internal denitrifying bacteria is achieved based on the biofilm thickness, so as to ensure the anoxic denitrification effect after the carrier migration, and at the same time lay the foundation for the enrichment of anaerobic ammonia oxidation; when acclimating the anoxic biofilm anaerobic ammonia oxidation, the anoxic zone is firstly implemented The enrichment of anaerobic ammonia-oxidizing bacteria provides a basis for the subsequent carrier migration; during the migration of anoxic / aerobic carriers, the anoxic enrichment of anaerobic ammonia is followed by inoculation and start-up of aerobic anaerobic ammonia oxidation; during the aerobic culture of anaerobic ammonia oxidation, the first aerobic tank carries out low-DO anaerobic ammonia oxidation culture to prevent high DO inhibition, while the third aerobic tank ensures the nitrification effect; during the aerobic enhancement of anaerobic ammonia oxidation, the first aerobic tank gradually improves the DO tolerance of aerobic anaerobic ammonia oxidation, providing a basis for further migration to the second aerobic tank with high DO; when the equipment is operated stably as a whole, the above steps are repeated regularly to ensure that the anaerobic ammonia oxidation effect in the equipment is always maintained at more than 70% of the maximum value.

[0032] A total water inlet pipeline I1 is provided at the front end of the first anoxic tank; a total water outlet pipeline I2 is provided at the end of the third aerobic tank; the inlet water enters the first anoxic tank through the total water inlet pipeline, passes through the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank in sequence, and is discharged from the total water outlet pipeline;

[0033] A water passage g is provided outside the first anoxic pool and the third aerobic pool for connecting the two.

[0034] Suspended carriers are added to the first anoxic pool, the second anoxic pool, the first aerobic pool, the second aerobic pool, and the third aerobic pool. Two walls are arranged at the ends of the first anoxic pool, the second anoxic pool, the first aerobic pool, and the second aerobic pool in a direction perpendicular to the water flow. A rotating mechanism is arranged between the two walls. The suspended carriers are controlled to flow into adjacent pools.

[0035] like Figure 2 As shown, the rotating mechanism includes an intercepting screen, a rotating shaft and a driving mechanism. The rotating shaft is located in the axial direction of the intercepting screen, that is, from the bottom to the top of the intercepting screen. The specific structure of the rotating shaft can be realized by those skilled in the art by reference to the prior art. The driving mechanism is connected to the rotating shaft, and the rotating shaft is driven to rotate by the driving mechanism, and the rotating shaft drives the intercepting screen to rotate. The rotatable intercepting screen here specifically refers to the intercepting screen S1 of the first anoxic pool, the intercepting screen S2 of the second anoxic pool, the intercepting screen S3 of the first aerobic pool, and the intercepting screen S4 of the second aerobic pool. The intercepting screen S5 of the third aerobic pool is fixed, and this application is called a fixed intercepting screen. All the intercepting screens are distributed with a number of small holes that prevent the suspended carrier from passing through. When the intercepting screen is driven to rotate by the rotating shaft, the suspended carrier in the adjacent pool body can flow.

[0036] like Figure 3 As shown, when the interception screen rotates to the same plane as the two walls, the suspended carrier cannot pass through; when one of the walls has a certain angle, the suspended carrier can pass through; when the interception screen rotates to be consistent with the direction of the water flow, the interception screen is fully opened and the suspended carrier can pass through at the maximum flow rate.

[0037] The above-mentioned transportable biofilm autotrophic denitrification equipment has a first water gate f1 on the water gallery side of the first anoxic tank, and a second water gate f2 and a third water gate f3 on the front and rear water gallery sides of the fixed intercepting screen of the third aerobic tank.

[0038] The above-mentioned transportable biofilm autotrophic denitrification equipment is provided with a liftable water outlet weir behind the interception screen of the third aerobic tank.

[0039] The above-mentioned transportable biofilm autotrophic denitrification equipment has MLSS < 500 mg / L in the first anoxic tank, the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank, the average pore diameter of the suspended carrier is > 5 mm, and the TN removal load of the first anoxic tank and the second anoxic tank is greater than 1.0 N / m 2 / d, 0.5gN / m 2 / d, the ammonia oxidation load of the first aerobic pool is greater than 1.0gN / m 2 / d, TN removal load greater than 0.1gN / m 2 / d. A liftable water outlet weir Y is arranged behind the fixed intercepting screen of the third aerobic tank, and the preferred aeration device is perforated aeration with a hole diameter of 4-6 mm.

[0040] Preferably, the installation height of the stirring device J is higher than 50% of the water depth and does not exceed the liquid surface; the lifting height of the water outlet weir should be greater than 50% of the height of the second water gate; the aperture of the intercepting screen in each pool body is 50% to 80% of the corresponding suspension carrier diameter.

[0041] Preferably, the power density of the stirring device in the first anoxic tank and the second anoxic tank is 5 to 15 W / m 3 ; The DO in the first aerobic pool is 6-8 mg / L, and the DO in the third and fourth aerobic pools are both 4-6 mg / L.

[0042] The following is an explanation of how to use the above equipment.

[0043] The specific steps are as follows:

[0044] Step 1: Aerobic biofilm thickness enhancement

[0045] Reduce the aeration of the first aerobic pool until the ammonia nitrogen loss is less than 15%, and increase the DO of the second aerobic pool. After the second aerobic pool and the third aerobic pool meet all the following conditions, proceed to step three;

[0046] The average biofilm thickness of the second aerobic tank is greater than 500 μm and the average biofilm thickness of the third aerobic tank is greater than 400 μm, and the ammonia oxidation load of the second aerobic tank is greater than 1.0 gN / m 2 / d and the ammonia oxidation load of the third aerobic tank is greater than 0.8gN / m 2 / d;

[0047] The TN removal loads of the second aerobic tank and the third aerobic tank were both greater than 0.1 gN / m 2 / d;

[0048] Step 3: Anaerobic ammonium oxidation acclimatization of anoxic biofilm

[0049] Increase the flow rate and reflux ratio in the first anoxic pool and the second anoxic pool so that the first anoxic pool and the second anoxic pool meet all the following conditions, and then proceed to step 4;

[0050] The average nitrous oxide concentration in the first and second anoxic pools was greater than 0.5 mg / L for 15 consecutive days;

[0051] The ammonia nitrogen removal load of the first anoxic tank is greater than 0.1gN / m 2 / d and the ammonia nitrogen removal load of the second anoxic tank is greater than 0.05gN / m 2 / d;

[0052] The relative abundance of anaerobic ammonium oxidizing bacteria in the first anoxic tank is greater than 1.0% and the relative abundance of anaerobic ammonium oxidizing bacteria in the second anoxic tank is greater than 0.5%;

[0053] Step 4: Anoxic / Aerobic Carrier Migration

[0054] The suspended carrier flows from the first anoxic pool to the second anoxic pool, the second anoxic pool to the first aerobic pool, the first aerobic pool to the second aerobic pool, the second aerobic pool to the third aerobic pool, and the third aerobic pool to the first anoxic pool through the water gallery until the suspended carrier returns to the state before migration after completing 0.2 to 0.4 HRT migration.

[0055] Step 5: Anaerobic ammonium oxidation aerobic culture

[0056] After the system runs stably and the following conditions are met at the same time, it proceeds to step 6:

[0057] The average nitrous acid concentration in the first anoxic pool was greater than 0.5 mg / L for 15 consecutive days;

[0058] The ammonia nitrogen removal load of the first anoxic tank is greater than 0.1gN / m 2 / d, the ammonia nitrogen removal load of the second anoxic pool is greater than 0.05gN / m 2 / d;

[0059] The TN removal load of the first aerobic tank is greater than 0.2 gN / m 2 / d;

[0060] Step 6: Anaerobic ammonium oxidation aerobic enhancement

[0061] Gradually increase the DO of the first aerobic pool to 4-6 mg / L and operate until the load of the first aerobic pool is stable > 0.2 gN / m for 5 consecutive days. 2 / d or more, repeat steps 4 to 6 to complete the migration of 3 HRTs;

[0062] Step 7. The equipment maintains stable operation. Repeat steps 1 to 7 every 3 months or when any value of the ammonia oxidation load of the first and second anoxic tanks or the TN removal load of the first aerobic tank and the second aerobic tank decreases by more than 30%. In steps 1 to 7, the equipment effluent ammonia nitrogen and TN are stably less than 0.5 mg / L and 5 mg / L, respectively.

[0063] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of protection claimed in the present application.

Claims

1. A transportable biofilm autotrophic denitrification equipment, comprising a reaction tank, a stirring device and an aeration device, Features: The reaction tank comprises a first anoxic tank, a second anoxic tank, a first aerobic tank, a second aerobic tank and a third aerobic tank which are arranged in sequence from front to back; A total water inlet pipeline is provided at the front end of the first anoxic tank; a total water outlet pipeline is provided at the end of the third aerobic tank; the inlet water enters the first anoxic tank through the total water inlet pipeline, passes through the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank in sequence, and is discharged from the total water outlet pipeline; A water passage is provided outside the first anoxic pool and the third aerobic pool for connecting the two. Suspended carriers are added to the first anoxic pool, the second anoxic pool, the first aerobic pool, the second aerobic pool, and the third aerobic pool. Two walls are arranged at the ends of the first anoxic pool, the second anoxic pool, the first aerobic pool, and the second aerobic pool in a direction perpendicular to the water flow. A rotating mechanism is arranged between the two walls. The suspended carriers are controlled to flow into adjacent pools. The rotating mechanism includes an intercepting screen, a rotating shaft and a driving mechanism. The rotating shaft is located in the axial direction of the intercepting screen. The driving mechanism is connected to the rotating shaft. The rotating shaft is driven to rotate by the driving mechanism, and the rotating shaft drives the intercepting screen to rotate.

2. A portable biofilm autotrophic denitrification equipment according to claim 1, Features: When the intercepting screen rotates to a certain angle with one of the walls, the suspended carrier can pass through.

3. The portable biofilm autotrophic denitrification equipment according to claim 1, Features: A first water gate is arranged on the water gallery side of the first anoxic pool, a fixed interception screen is arranged at the end of the third aerobic pool, and a second water gate and a third water gate are arranged on the front and rear water gallery sides of the fixed interception screen of the third aerobic pool, respectively.

4. The portable biofilm autotrophic denitrification equipment according to claim 1, Features: A liftable outlet weir is arranged behind the fixed intercepting screen of the third aerobic tank.

5. The portable biofilm autotrophic denitrification equipment according to claim 1, Features: The MLSS of the suspended carriers in the first anoxic tank, the second anoxic tank, the first aerobic tank, the second aerobic tank, and the third aerobic tank is less than 500 mg / L, the average pore diameter of the suspended carrier is greater than 5 mm, and the TN removal load of the first anoxic tank and the second anoxic tank is greater than 1.0 N / m 2 / d, 0.5gN / m 2 / d, the ammonia oxidation load of the first aerobic pool is greater than 1.0gN / m 2 / d, TN removal load greater than 0.1gN / m 2 / d.

6. The portable biofilm autotrophic denitrification equipment according to claim 3, Features: The stirring device in the third aerobic tank is installed on the opposite side of the second water gate.

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