Intermittent aeration type circulating flow biological membrane AO mode integrated sewage treatment device

Abstract

An intermittent aeration type circulating flow biological membrane AO mode integrated sewage treatment device belongs to the field of sewage treatment, and adopts the following specific scheme: the intermittent aeration type circulating flow biological membrane AO mode integrated sewage treatment device comprises an anoxic tank, an aerobic tank, a rear anoxic tank and a sedimentation tank; sewage entering the anoxic tank flows to the aerobic tank through a baffling water flowing port II, a steam stripping device I and a steam stripping device II are arranged in the aerobic tank, the steam stripping device I reflows nitrification liquid to enter the anoxic tank, the steam stripping device II reflows mud-water mixture to enter the rear anoxic tank, and sewage in the rear anoxic tank flows to the aerobic tank through a baffling water flowing port III; the aerobic tank is provided with an effluent weir I, the effluent weir I is communicated with the sedimentation tank through an overflow water outlet pipe, and an anoxic intermittent aeration device, an aerobic aeration device and a rear anoxic intermittent aeration device are respectively arranged in the anoxic tank, the aerobic tank and the rear anoxic tank. The utility model ensures that the quality of the effluent meets the requirements of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of sewage treatment, concretely relates to an intermittent aeration type circulating flow biofilm AO mode integrated sewage treatment device. BACKGROUND

[0002] Due to the characteristics of rural domestic sewage, such as large fluctuation of water quality and quantity, scattered population distribution and small sewage volume in large villages, the technology and management mode of urban sewage project are less applicable to rural sewage treatment. Whether the sewage can be stably discharged up to the standard, whether the treatment facilities can be continuously operated and the like have become the key and difficult problems to be solved in rural sewage treatment. Therefore, developing a rural sewage centralized treatment device which is adapted to the current rural social and economic development, cost-saving, convenient to manage, stable in operation and up to the standard in effluent quality has important significance for improving water resource utilization rate and reducing environmental pollution.

[0003] In order to save cost, when designing the sewage treatment device for centralized treatment of rural sewage, mechanical stirring and sludge sedimentation equipment should be reduced as much as possible. In order to facilitate management, integrated design should be adopted as much as possible. In order to stabilize operation, the characteristics of large fluctuation of water quality and quantity of rural sewage should be considered as much as possible. In order to ensure the effluent quality, the characteristics of low sludge activity, small total amount of bacteria and limited removal effect of pollutants in low temperature period should be considered. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the problems in the background art, the utility model provides an intermittent aeration type circulating flow biofilm AO mode integrated sewage treatment device.

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

[0006] The application discloses an intermittent aeration type circulating flow bio-membrane AO mode integrated sewage treatment device, which comprises an anoxic tank, an aerobic tank, a post-anoxic tank and a sedimentation tank; the anoxic tank and the aerobic tank are communicated through a baffle water outlet II arranged on a shared pool wall of the anoxic tank and the aerobic tank; sewage entering the anoxic tank flows to the aerobic tank through the baffle water outlet II; the aerobic tank is provided with a stripping device I and a stripping device II; the stripping device I is communicated with the anoxic tank through a nitrification liquid pipeline, and nitrification liquid in the aerobic tank is returned to the anoxic tank; the stripping device II is communicated with the post-anoxic tank through a sludge-water mixture pipeline, and sludge-water mixture in the aerobic tank is returned to the post-anoxic tank; the post-anoxic tank and the aerobic tank are communicated through a baffle water outlet III arranged on a shared pool wall of the post-anoxic tank and the aerobic tank; sewage in the post-anoxic tank flows to the aerobic tank through the baffle water outlet III; the aerobic tank is provided with a water outlet weir I; the water outlet weir I is communicated with the sedimentation tank through an overflow water outlet pipeline; the anoxic tank is provided with an anoxic intermittent aeration device; the aerobic tank is provided with an aerobic aeration device; the post-anoxic tank is provided with a post-anoxic intermittent aeration device; and the anoxic tank, the aerobic tank and the post-anoxic tank are all provided with fixed fillers.

[0007] Preferably, the anoxic tank is provided with a water inlet I, and the sedimentation tank is provided with a stripping device III; the stripping device III is communicated with the anoxic tank through a return sludge pipeline, and part of sludge in the sedimentation tank is returned to the anoxic tank.

[0008] As a preferred mode, the sewage treatment device further comprises an anaerobic tank; the anaerobic tank is provided with a water inlet I; the anaerobic tank and the anoxic tank are communicated through a baffle water outlet I arranged on a shared pool wall of the anaerobic tank and the anoxic tank; sewage entering the anaerobic tank flows to the anoxic tank through the baffle water outlet I; the sedimentation tank is provided with a stripping device III; the stripping device III is communicated with the anaerobic tank through a return sludge pipeline, and part of sludge in the sedimentation tank is returned to the anaerobic tank; the anaerobic tank is provided with fixed fillers, and the anaerobic tank is internally provided with an anaerobic intermittent aeration device.

[0009] Further, the post-anoxic tank is provided with a water inlet II; the post-anoxic tank is provided with a guide plate, and the post-anoxic tank is divided into a first pool body and a second pool body and is communicated through a guide area; the stripping device II is communicated with the first pool body of the post-anoxic tank; the baffle water outlet III corresponds to the second pool body; the stripping device II returns sludge-water mixture into the first pool body of the post-anoxic tank; sewage in the first pool body flows into the second pool body through the guide area and then flows to the aerobic tank through the baffle water outlet III; and the water inlet II is arranged on a side wall of the first pool body.

[0010] As a preferred mode, the sewage treatment device further comprises a microfiltration tank and a clean water tank, the sedimentation tank is provided with a water outlet weir II, the water outlet weir II is communicated with the microfiltration tank through a water conveying pipe, the microfiltration tank is internally provided with a microfiltration membrane, sewage passing through the microfiltration membrane is pumped into the clean water tank through a water producing pump, the clean water tank is provided with a water outlet pipeline, and a tubular ultraviolet clean water disinfection device is installed on the water outlet pipeline.

[0011] Further, the sewage treatment device further comprises a backwashing water pump, clean water in the clean water tank is pumped to the microfiltration membrane for cleaning of the microfiltration membrane.

[0012] Further, the sewage treatment device is further provided with an equipment room, the aeration fan I communicated with the anoxic intermittent aeration device and the post-anoxic intermittent aeration device, the aeration fan II communicated with the aerobic aeration device and a PLC control cabinet are all arranged in the equipment room, and the PLC control cabinet is signal connected with the aeration fan I and the aeration fan II respectively.

[0013] Further, the anoxic intermittent aeration device is communicated with the aeration fan I.

[0014] Further, the sedimentation tank is provided as one of a inclined plate sedimentation tank, an inclined tube sedimentation tank or a vertical flow sedimentation tank, and the sedimentation tank is provided with a sludge discharge pipe.

[0015] Compared with the prior art, the sewage treatment device has the beneficial effects that:

[0016] The utility model discloses an integrated sewage treatment device, which is composed of an anaerobic tank, an anoxic tank, an aerobic tank, a post-positioned anoxic tank, a sludge storage tank, a sedimentation tank, a clear water tank and a microfiltration tank, and is suitable for rural sewage treatment with large water quality fluctuation and low C / N. In the biochemical reaction stage, the anaerobic zone and the anoxic zone adopt an intermittent aeration mode to strengthen the contact between sludge and sewage, and through a biofilm-activated sludge complex bacterial group, efficient removal of organic matter and nitrogen and phosphorus is realized. At the same time of ensuring that the dissolved oxygen in the anaerobic zone and the anoxic zone meets the required working condition, mechanical stirring equipment is saved. Through a segmented water inlet mode, sewage enters the anaerobic tank and the post-positioned anoxic tank, and the organic matter in the sewage is used as a carbon source for the post-positioned anoxic tank denitrification stage, so that the denitrification capacity of the post-positioned anoxic tank is improved, and the dosage of the additional carbon source is reduced. Through the adoption of the circulating flow biofilm AO process, the amount of microorganisms in the reactor is increased, and the impact resistance and the operation stability of the treatment process are improved. The stripping mode is used to provide power for the nitration liquid reflux, sludge reflux and sewage self-circulation, and a submersible pump is replaced, so that equipment maintenance and repair are facilitated. In the advanced treatment stage, the sedimentation tank and the microfiltration membrane are combined, the sludge concentration in the water is greatly reduced after the sewage is deposited in the sedimentation tank, sludge-water separation and automatic sludge renewal are realized, the working load of the microfiltration membrane is reduced, the service life of the microfiltration membrane is improved, the SS of the effluent can meet the discharge standard requirements, and the service life of the microfiltration membrane is improved. In the disinfection stage, the disinfection mainly adopts the ultraviolet tube type disinfection facility, the pathogenic microorganisms in the sewage are reduced, space is effectively saved, the adverse effects of the disinfectant on the microfiltration membrane when the effluent of the clear water tank is used for microfiltration membrane backwashing are reduced, and the service life of the microfiltration membrane is improved. The sludge in the device has high concentration and high activity, the equipment structure is simple and compact, the operation is stable and has strong impact resistance, maintenance is facilitated, the device can be mass-produced in a modular manner, and the effluent water quality of the integrated sewage treatment device meets the requirements of the Urban Sewage Treatment Plant Pollutant Discharge Standard. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a plan view of the integrated sewage treatment device of the utility model;

[0018] Figure 2 is Figure 1 the A-A sectional view in the

[0019] In the figure, 1, sewage treatment device, 2, anaerobic tank, 3, anoxic tank, 4, aerobic tank, 5, post anoxic tank, 6, sedimentation tank, 7, microfiltration tank, 8, clear water tank, 9, equipment room, 10, water inlet II, 11, water inlet I, 12, baffle water outlet I, 13, baffle water outlet II, 14, stripping device I, 15, anaerobic intermittent aeration device, 16, anoxic intermittent aeration device, 17, aerobic aeration device, 18, stripping device II, 19, post anoxic intermittent aeration device, 20, guide plate, 21, guide area, 22, baffle water outlet III, 23, fixed filler, 24, water outlet weir I, 25, overflow water pipe, 26, water outlet weir II, 27, water delivery pipe, 28, microfiltration membrane, 29, stripping device III, 30, sludge discharge pipe, 31, aeration fan I, 32, aeration fan II, 33, PLC control cabinet, 34, backwash pump, 35, water production pump, 36, tubular ultraviolet clear water disinfection device, 37, water outlet pipeline. DETAILED DESCRIPTION

[0020] The technical solutions in the present application will be described clearly and completely in combination with the drawings and examples. Obviously, the described examples are only some of the examples of the present application, but not all the examples. Based on the examples in the present application, all the other examples obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0021] Example 1

[0022] The application discloses an integrated sewage treatment device of intermittent aeration type circulating flow bio-membrane AO mode, which integrates an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a post-anoxic tank 5, a sedimentation tank 6, a microfiltration tank 7, a clean water tank 8 and a device room 9. When the integrated sewage treatment device 1 is in operation, the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4 and the post-anoxic tank 5 are filled with sludge-water mixture. Sewage enters the anaerobic tank 2 from a water inlet I 11, and then enters the anoxic tank 3 and the aerobic tank 4 in sequence under the pushing of water flow through a baffle water inlet I 12 and a baffle water inlet II 13. Phosphorus release and partial organic matter reduction are completed in the anaerobic tank 2. In the anoxic tank 3, sewage is mixed with nitrification liquid refluxed from the aerobic tank 4 through a stripping device I 14 to perform denitrification and realize reduction of nitrate and total nitrogen concentration. In the aerobic tank 4, aerobic biochemical reaction is completed to achieve the purposes of organic matter reduction, ammonia nitrogen conversion and phosphorus absorption. The anaerobic intermittent aeration device 15 and the anoxic intermittent aeration device 16 are respectively arranged in the anaerobic tank 2 and the anoxic tank 3 to realize sufficient mixing of sewage and sludge-water mixture, and the required air is provided by a device room 9 aeration fan I 31, which is electrically connected with a PLC control cabinet 33 to realize required control conditions of intermittent aeration through the PLC control cabinet 33 control of electromagnetic valves. The required air of the aerobic tank 4 is provided by the device room 9 aeration fan II 32 through an aerobic aeration device 17, and the aeration fan II 32 is electrically connected with the PLC control cabinet 33. The sludge-water mixture in the aerobic tank 4 is lifted to the post-anoxic tank 5 through a stripping device II 18 to form internal circulation. Further denitrification is performed in the post-anoxic tank 5 to realize reduction of nitrate and total nitrogen concentration, and part of the sewage enters through a water inlet II 10 to provide a carbon source for the denitrification. The post-anoxic intermittent aeration device 19 is arranged in the post-anoxic tank 5 to realize sufficient mixing of sewage and sludge-water mixture, and the required air is provided by the device room 9 aeration fan I 31, which realizes required control conditions of intermittent aeration through the PLC control cabinet 33 control of electromagnetic valves. Meanwhile, a flow guide plate 20 is arranged in the post-anoxic tank 5 to prevent water flow short-circuiting, and the sludge-water mixture flows into the aerobic tank 4 through a flow guide area 21 and a baffle water inlet III 22 under the action of gravity. In order to improve the microbial concentration in the reaction zone of the integrated sewage treatment device 1, fixed fillers 23 are arranged in the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4 and the post-anoxic tank 5. The sludge-water mixture in the aerobic tank 4 enters the sedimentation tank 6 through an aerobic tank water outlet weir I 24 and an overflow water outlet pipe 25, and then flows upwards into the upper water outlet area of the sedimentation tank 6 under the pushing of water flow, and the sludge stays in the sludge setting area at the bottom of the sedimentation tank 6 to realize sludge-water separation. The separated sewage enters the microfiltration tank 7 through a sedimentation tank water outlet weir II 26 and a water conveying pipe 27, the microfiltration membrane 28 is vertically fixed in the microfiltration tank 7 in a barrel shape, a water production pump 35 is arranged in the device room 9, the water inlet end of the water production pump 35 is connected to the middle part of the barrel-shaped microfiltration membrane 28, and the water outlet end is connected to the clean water tank 8. Sewage is discharged into the clean water tank 8 after passing through the microfiltration membrane 28 under the action of the water production pump 35 to realize deep removal of pollutants in the sewage.The backwash water pump 34 is arranged in the equipment room 9, and the backwash water pump 34 sucks clean water in the clean water pool 8 for backwashing the microfiltration membrane 28. The water production pump 35 and the backwash water pump 34 are electrically connected with the PLC control cabinet 33. The clean water pool 8 is provided with an outlet pipeline 37, and a tubular ultraviolet clean water disinfection device 36 is arranged on the outlet pipeline 37. Under the action of the disinfection device, pathogenic microorganisms are killed. Part of the sludge in the sedimentation tank 6 is backflowed to the anaerobic tank 2 through the sludge backflow stripping device III 29, and another part of the sludge is discharged through the sludge discharge pipe 30 to realize self-renewal. The water quality after being treated by the integrated sewage treatment device 1 can meet the requirements of the first level A of the Discharge Standard of Pollutants in Municipal Sewage Treatment Plant (GB 18918-2002).

[0023] In engineering applications, the integrated sewage treatment device (1) can be laid on the upper part of the ground, can be buried underground, can be arranged inside a room, or can be arranged outside a room.

[0024] Example 2

[0025] The difference between this embodiment and example 1 is that the anaerobic tank 2 is not arranged, the water inlet I 11 is arranged on the side wall of the anoxic tank 3, and the stripping device III 29 backflows part of the sludge to the anoxic tank 3.

[0026] In engineering applications, phosphorus removal drugs are added to the sedimentation tank 6, and the water quality can meet the first level A standard of the Discharge Standard of Pollutants in Municipal Sewage Treatment Plant (GB 18918-2002).

[0027] Example 3

[0028] The difference between this embodiment and example 1 is that the microfiltration tank 7 and the clean water pool 8 are not arranged, and the water quality can meet the first level B standard of the Discharge Standard of Pollutants in Municipal Sewage Treatment Plant (GB 18918-2002).

[0029] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An integrated wastewater treatment device using an intermittent aeration circulating biofilm AO mode, characterized in that: The sewage treatment device (1) comprises an anoxic tank (3), an aerobic tank (4), a post-anoxic tank (5) and a sedimentation tank (6); the anoxic tank (3) and the aerobic tank (4) are communicated through a baffle overpassing water port II (13) arranged on the pool wall shared by the two, and sewage flows from the anoxic tank (3) to the aerobic tank (4); the aerobic tank (4) is provided with a stripping device I (14) and a stripping device II (18); the stripping device I (14) is communicated with the anoxic tank (3) through a nitrification liquid pipeline; the stripping device II (18) is communicated with the post-anoxic tank (5) through a sludge-water mixture pipeline; the post-anoxic tank (5) and the aerobic tank (4) are communicated through a baffle overpassing water port III (22) arranged on the pool wall shared by the two, and sewage flows from the post-anoxic tank (5) to the aerobic tank (4); the aerobic tank (4) is provided with a water outlet weir I (24); the water outlet weir I (24) is communicated with the sedimentation tank (6) through an overflow outlet pipeline (25); the anoxic tank (3) is provided with an anoxic intermittent aeration device (16); the aerobic tank (4) is provided with an aerobic aeration device (17); the post-anoxic tank (5) is provided with a post-anoxic intermittent aeration device (19); the anoxic tank (3), the aerobic tank (4) and the post-anoxic tank (5) are all installed with fixed fillers (23).

2. The sewage treatment device of claim 1, wherein: The anoxic tank (3) is provided with a water inlet I (11); the sedimentation tank (6) is provided with a stripping device III (29); the stripping device III (29) is communicated with the anoxic tank (3) through a backflow sludge pipeline.

3. The sewage treatment device of claim 1, wherein: The sewage treatment device (1) further comprises an anaerobic tank (2); the anaerobic tank (2) is provided with a water inlet I (11); the anaerobic tank (2) and the anoxic tank (3) are communicated through a baffle overpassing water port I (12) arranged on the pool wall shared by the two, and sewage flows from the anaerobic tank (2) to the anoxic tank (3); the sedimentation tank (6) is provided with a stripping device III (29); the stripping device III (29) is communicated with the anaerobic tank (2) through a backflow sludge pipeline.

4. The sewage treatment device of claim 3, wherein: The anaerobic tank (2) is installed with fixed fillers (23); the anaerobic tank (2) is internally provided with an anaerobic intermittent aeration device (15).

5. The sewage treatment device of claim 1, wherein: The post-anoxic tank (5) is provided with a water inlet II (10).

6. The sewage treatment device of claim 5, wherein: The post-anoxic tank (5) is provided with a flow guide plate (20), which divides the post-anoxic tank (5) into a first tank body and a second tank body and communicates the two through a flow guide area (21); the stripping device II (18) is communicated with the first tank body of the post-anoxic tank (5); the baffle overpassing water port III (22) corresponds to the second tank body; the water inlet II (10) is arranged on the side wall of the first tank body.

7. The sewage treatment device of claim 1, wherein: The sewage treatment device (1) further comprises a microfiltration tank (7) and a clean water tank (8), the sedimentation tank (6) is provided with a water outlet weir II (26), the water outlet weir II (26) is communicated with the microfiltration tank (7) through a water conveying pipe (27), the microfiltration tank (7) is internally provided with a microfiltration membrane (28), sewage passing through the microfiltration membrane (28) is pumped into the clean water tank (8) through a water production pump (35), the clean water tank (8) is provided with a water outlet pipeline (37), and a tubular ultraviolet clean water disinfection device (36) is installed on the water outlet pipeline (37).

8. The sewage treatment device of claim 7, wherein: The sewage treatment device (1) further comprises a backwashing water pump (34), clean water in the clean water tank (8) is pumped to the microfiltration membrane (28) for cleaning of the microfiltration membrane (28).

9. The sewage treatment device of claim 1, wherein: The sewage treatment device (1) is further provided with an equipment room (9), the aeration fan I (31) communicated with the anoxic intermittent aeration device (16) and the post-anoxic intermittent aeration device (19), the aeration fan II (32) communicated with the aerobic aeration device (17) and the PLC control cabinet (33) are all arranged in the equipment room (9), and the PLC control cabinet (33) is respectively signal connected with the aeration fan I (31) and the aeration fan II (32).

10. The sewage treatment device of claim 1, wherein: The sedimentation tank (6) is arranged as one of a inclined plate sedimentation tank, an inclined tube sedimentation tank or a vertical flow sedimentation tank, and the sedimentation tank (6) is provided with a sludge discharge pipe (30).

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