Buried sewage treatment system

Abstract

The utility model relates to the technical field of sewage treatment, and provides a buried sewage treatment system, which comprises a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a filter tank, a clean water tank, a sludge tank and a fan which are sequentially arranged along the flowing direction of sewage, and comprises a whole set of flow of sewage treatment. The system can adjust the sewage treatment mode according to different inlet water quality, discharge standards or water requirements, and is high in integration level, complete in function and high in sewage treatment utilization rate.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to an underground sewage treatment system. Background Art

[0002] With the development of society and the increase of national economic income, environmental protection issues have received more and more attention from all walks of life. For sewage, in addition to the conventional centralized sewage treatment plants in villages, towns and industrial areas, there have been industry models such as upgrading and transformation of old sewage treatment plants, rural sewage point source treatment, black and smelly river basin treatment, and centralized sludge treatment. For the treatment of rural sewage in villages and towns, the existing sewage treatment system still has incomplete treatment functions and cannot take into account the needs of rural agricultural fertilizers and irrigation. At the same time, the quality of rural sewage is greatly affected by the time of morning and evening, holidays, etc., and it is often the case that the water volume is too small and the concentration is low on weekdays, while the water volume is excessive and the concentration is high on holidays, which makes it difficult to take into account the effect of sewage treatment equipment. Utility Model Content

[0003] The utility model aims to provide an underground sewage treatment system to solve the above-mentioned technical problems, with high system integration, complete functions and high sewage treatment utilization rate.

[0004] The embodiment of the utility model is realized by the following technical scheme: an underground sewage treatment system, comprising a regulating tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a filtering tank and a clear water tank arranged in sequence along the flow direction of sewage, a lifting pump connected to a pipeline for lifting sewage to the anaerobic tank, the anoxic tank and the aerobic tank respectively is provided in the regulating tank, the lower part of the anaerobic tank is connected with the lower part of the anoxic tank, the upper part of the anoxic tank is connected with the upper part of the aerobic tank, a circulation channel with a circular horizontal plane is provided in the aerobic tank, a plug flow agitator for unidirectional plug flow stirring sewage is provided in the circulation channel, the upper part of the aerobic tank is connected with the middle part of the sedimentation tank The upper part of the sedimentation tank is connected with the middle part of the filter tank, the upper part of the filter tank is connected with the upper part of the clean water tank, and also includes a sludge tank and a fan. The sludge at the bottom of the sedimentation tank and the bottom of the filter tank are discharged into the sludge tank through pipelines. The bottom of the sedimentation tank is connected with the bottom of the anaerobic tank and the aerobic tank respectively through pipelines and a one-way valve for controlling sludge backflow. The bottom of the filter tank is connected with the bottom of the anaerobic tank and the aerobic tank respectively through pipelines and a one-way valve. The bottom of the aerobic tank is connected with the bottom of the anoxic tank through pipelines and a one-way valve. The fan is connected with the aerobic tank, anaerobic tank, anoxic tank, sedimentation tank and filter tank respectively through air pipes and switch valves.

[0005] Furthermore, a circulation channel is formed in the middle of the aerobic tank by arranging a vertical partition or a sedimentation tank.

[0006] Preferably, two plug flow agitators are provided, and the two plug flow agitators are respectively arranged on both sides of the vertical partition or the sedimentation tank, and the plug flow directions of the two plug flow agitators are opposite.

[0007] Furthermore, anoxic fillers are provided in the anoxic tank, an aeration device connected to a fan is provided at the bottom of the aerobic tank, an inclined tube filler is provided in the sedimentation tank, a filter filler is provided in the filter tank, an ultraviolet sterilizer is provided at the front end of the clear water tank, a grey water pump is provided in the clear water tank, and a filtrate pipe is provided in the sludge tank.

[0008] Furthermore, the regulating tank is connected to a water inlet pipe, and a separator for preliminarily screening water from the water inlet pipe is provided in the regulating tank.

[0009] Preferably, the separator is provided with a grid, a filter screen, a filter cloth and a sand filter material in sequence from top to bottom along the water flow direction.

[0010] Furthermore, the sludge at the bottom of the sedimentation tank and the filter tank is discharged into the sludge tank by steam stripping.

[0011] The utility model has at least the following advantages and beneficial effects: by sequentially arranging the regulating tank, anaerobic tank, anoxic tank, aerobic tank, sedimentation tank, filtration tank and clear water tank along the flow direction of sewage, as well as the arrangement of the sludge tank and the fan, the system can adjust the sewage treatment mode according to different influent water quality, discharge standards or water use requirements, and the system has high system integration, complete functions and high sewage treatment utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A process flow chart of an underground sewage treatment system provided by the utility model;

[0014] Figure 2 A plan view of a large volume sewage treatment system in an underground sewage treatment system provided by the utility model;

[0015] Figure 3 A plan view of a small-volume sewage treatment system in an underground sewage treatment system provided by the utility model;

[0016] Icons: 1- regulating tank, 10- water inlet pipe, 11- lifting pump, 12- separator, 2- anaerobic tank, 20- pneumatic agitator, 3- anoxic tank, 31- anoxic filler, 4- aerobic tank, 40- circulation channel, 41- plug flow agitator, 42- vertical baffle, 43- aeration device, 5- sedimentation tank, 51- inclined tube filler, 6- filter tank, 61- filter filler, 62- flushing pipe, 7- clear water tank, 71- ultraviolet disinfector, 72- grey water pump, 8- sludge tank, 81- filtrate pipe, 9- fan. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1

[0020] like Figure 1 , 2 As shown, in this embodiment, a buried sewage treatment system is mainly disclosed, which is particularly suitable for large-volume sewage treatment, including a regulating tank 1, an anaerobic tank 2, an anoxic tank 3, an aerobic tank 4, a sedimentation tank 5, a filter tank 6, a clean water tank 7, a sludge tank 8 and a fan 9 arranged in sequence along the sewage flow direction; specifically, the regulating tank 1, the anaerobic tank 2, the anoxic tank 3, the aerobic tank 4, the sedimentation tank 5, the filter tank 6, the clean water tank 7 and the sludge tank 8 are integrated in a container and installed underground, and the fan 9 is installed in a ground equipment room;

[0021] A lifting pump 11 connected to the pipeline is provided in the regulating tank 1 for lifting sewage to the anaerobic tank 2, the anoxic tank 3 and the aerobic tank 4 respectively. Specifically, the pipeline connected to the lifting pump 11 can be composed of a main pipe and a branch pipe, each branch pipe guides the anaerobic tank 2, the anoxic tank 3 and the aerobic tank 4 respectively, and valves are provided on the branch pipes for controlling the lifting and discharge position of the sewage in the regulating tank 1. The upper part of the anoxic tank 3 is connected with the upper part of the aerobic tank 4, and the aerobic tank 4 is provided with a circulation channel 40 with a circular horizontal plane. A plug flow agitator 41 for unidirectional plug flow stirring of sewage is provided in the circulation channel 40. The upper part of the aerobic tank 4 is connected with the middle part of the sedimentation tank 5, the upper part of the sedimentation tank 5 is connected with the middle part of the filter tank 6, and the upper part of the filter tank 6 is connected with the upper part of the clean water tank 7; specifically, the sewage to be treated is connected by gravity. Or the lifting device enters the regulating tank 1. After the regulating tank 1 is filled with water, the sewage enters the anaerobic tank 2 through the lifting pump 11, and flows into the anoxic tank 3 by gravity through the bottom connecting channel of the anaerobic tank 2 and the anoxic tank 3. After anaerobic and anoxic reactions, it flows into the aerobic tank 4 from the upper part of the anoxic tank 3. The sewage circulates back and forth in the circulation channel 40 of the aerobic tank 4, and the pollutants in the sewage are absorbed by aerobic microorganisms. After the reaction is suitable for the residence time, it is discharged into the sedimentation tank 5 from the middle of the sedimentation tank 5 through the channel between the sedimentation tank 5 and the aerobic tank 4. The intercepted sludge is deposited at the bottom of the sedimentation tank 5. The separated sewage enters the filter tank 6 from the middle of the filter tank 6 through the channel between the sedimentation tank 5 and the filter tank 6, absorbs the suspended matter remaining in the sewage, and then enters the clean water tank 7 to store water, and finally overflows and meets the standards for discharge;

[0022] The sludge at the bottom of the sedimentation tank 5 and the bottom of the filter tank 6 are discharged into the sludge tank 8 through pipelines. The bottom of the sedimentation tank 5 is connected to the bottom of the anaerobic tank 2 and the aerobic tank 4 respectively through pipelines and a one-way valve for controlling the sludge backflow. The bottom of the filter tank 6 is connected to the bottom of the anaerobic tank 2 and the aerobic tank 4 respectively through pipelines and a one-way valve. The bottom of the aerobic tank 4 is connected to the bottom of the anoxic tank 3 through pipelines and a one-way valve. Specifically, the sludge at the bottom of the sedimentation tank 5 and the filter tank 6 is discharged into the sludge tank 8 by steam stripping, which helps to remove the sludge accumulated at the bottom and improve the sludge treatment efficiency and quality. At the same time, a part of the sludge at the bottom of the sedimentation tank 5 can be discharged into the anaerobic tank 2 to increase the sludge concentration of the system and prevent the loss of microorganisms. The sludge at the bottom of the aerobic tank 4 can be partially returned to the front end of the bottom of the anoxic tank 3 to remove total nitrogen and total phosphorus.

[0023] The fan 9 is connected to the aerobic tank 4, the anaerobic tank 2, the anoxic tank 3, the sedimentation tank 5 and the filter tank 6 respectively through the air pipe and the switch valve. Specifically, through the on-off of the switch valve, the wind source provided by the fan 9 can be used for aeration of the aerobic tank 4, intermittently provide pneumatic stirring for the anaerobic tank 2 and the anoxic tank 3, for sludge stripping of the sedimentation tank 5 and the filter tank 6, and for sludge stripping reflux of the aerobic tank 4 and the sedimentation tank 5;

[0024] It should be noted that this sewage treatment system includes a full set of sewage treatment processes and is fully functional. It can adjust the sewage treatment method according to different influent water qualities to meet the water requirements of different water qualities and discharge standards;

[0025] When the sewage concentration or nutrient ratio is not in an ideal state, the nutrient imbalance may easily lead to a decrease in the reaction effect of the treatment unit, resulting in substandard sewage treatment. The system can realize segmented water intake through the lifting pump 11 and the valve. According to the water quality conditions, the sewage in the regulating tank 1 can be sent to the anaerobic tank 2 and the aerobic tank 4 respectively to reduce the load of the front-end treatment unit, adjust the carbon source and nitrogen source nutrient ratio of each treatment unit, and balance the contradiction between the total nitrogen and total phosphorus removal and the carbon source demand. Then, a large amount of sludge is discharged through the sedimentation tank 5, and the sewage from the filtration tank 6 is returned to the circulation channel 40 of the aerobic tank 4, so as to increase the circulation time of the sewage in the aerobic tank 4 and finally meet the discharge standards.

[0026] When the influent volume or water quality exceeds the design value, the sewage treatment system usually has insufficient retention time and insufficient treatment load in each reaction unit due to the increase in influent volume or water quality, which eventually leads to substandard effluent quality. This system can increase the sludge discharge volume of the sedimentation tank 5 and simultaneously lead the sewage in the filter tank 6 to the front anaerobic tank 2 and aerobic tank 4. Through the circulation design in the aerobic tank 4, the sewage that does not meet the standards is circulated and treated, and the total retention reaction time is extended until it meets the standards.

[0027] When the influent concentration is too low, the influent volume is too low or the discharge requirement is reduced, the regulating tank 1 replaces the function of the anaerobic tank 2, and the sewage is directly lifted into the aerobic tank 4 for reaction. The aeration of the aerobic tank 4 adopts intermittent aeration. Through circulation, an anoxic-anaerobic state is formed in the aerobic tank 4 to prevent the sludge from disintegrating due to too little water or too low concentration and too much aeration during normal operation. At the same time, the sludge in the sedimentation tank 5 flows back to the front end of the aerobic tank 4 to increase the sludge concentration in the aerobic tank 4.

[0028] Furthermore, in a specific implementation, a circulation channel 40 is formed by setting a vertical partition 42 in the middle of the above-mentioned aerobic pool 4 provided in an embodiment of the utility model; two plug flow agitators 41 are provided, and the two plug flow agitators 41 are respectively arranged on both sides of the vertical partition 42, and the plug flow directions of the two plug flow agitators 41 are opposite, so that a sewage circulation that can rotate clockwise or counterclockwise is formed in the aerobic pool 4, and the sewage flows into the subsequent sedimentation tank 5 after multiple cycles in the aerobic pool 4, which can cope with various working conditions and water quality.

[0029] Furthermore, in a specific implementation, an anoxic filler 31 is provided in the anoxic pool 3 provided in the embodiment of the utility model, an aeration device 43 connected to a fan 9 is provided at the bottom of the aerobic pool 4, an inclined tube filler 51 is provided in the sedimentation pool 5, a filter filler 61 is provided in the filter pool 6, an ultraviolet disinfector 71 is provided at the front end of the clean water pool 7, a reclaimed water pump 72 is provided in the clean water pool 7, and a filtrate pipe 81 is provided in the sludge pool 8. Specifically, the anoxic filler 31 can adopt the existing technology, usually made of plastic in different shapes, to increase the microbial attachment area and dissolved oxygen content, and improve the reaction efficiency; the aeration device 43 generally adopts the existing technology, and aeration of the aerobic pool 4 is achieved by blowing air from the fan 9; the inclined tube filler 51 can adopt a honeycomb-shaped inclined tube filler 51, which is installed against the water flow at an angle of 60°, and the sewage enters the inclined tube filler 51 from below; the filter filler 61 can adopt The polyurethane mesh filler is fixed with mesh plates at the top and bottom; the water entering the clean water tank 7 is first irradiated with ultraviolet rays by an ultraviolet disinfector 71 to kill bacteria and pathogens in the water body, and then stored in the clean water tank 7. When the reclaimed water needs to be reused, the reclaimed water pump 72 is used to lift the clean water for use; the filtrate pipe 81 is an L-shaped hollow structure, one end of the filtrate pipe 81 is inserted into the sludge in the sludge tank 8, and a water-permeable hole is provided on the pipe wall. The residual water in the sludge enters the filtrate pipe 81 through the water-permeable hole and is led out of the sludge tank 8 from the other end of the filtrate pipe 81; in addition, a pneumatic agitator 20 connected to the fan 9 is provided at the bottom of the anaerobic tank 2 and the anoxic tank 3. The pneumatic agitator 20 can be a pipe with a plurality of air holes, which can prevent sludge accumulation in the tank body by timed air blowing and stirring; a flushing pipe 62 connected to the fan 9 for backwashing the filter filler 61 is provided at the bottom of the filter tank 6.

[0030] Furthermore, in a specific implementation, the regulating tank 1 provided in the embodiment of the utility model is connected to a water inlet pipe 10, and a separator 12 for preliminarily screening the water from the water inlet pipe 10 is provided in the regulating tank 1. Specifically, the separator 12 is provided with a grid, a filter screen, a filter cloth, and a sand filter material in sequence from top to bottom along the flow direction. The sewage from the water inlet pipe 10 enters the top of the separator 12, and after filtering impurities, it flows out from the bottom of the separator 12. The filtered impurities can be used as farm dry fertilizer.

[0031] Embodiment 2

[0032] like Figure 3As shown, in this embodiment, the main structure is exactly the same as that of the first embodiment, and the difference is that this embodiment is particularly suitable for small-volume sewage treatment. A circulation channel 40 is formed by setting a sedimentation tank 5 in the middle of the aerobic tank 4, and two plug flow agitators 41 are respectively arranged on both sides of the sedimentation tank 5, and the plug flow directions of the two plug flow agitators 41 are opposite. It should be noted that when the amount of treated water is small, the utilization rate of the inclined tube filler 51 in the sedimentation tank 5 will be greatly reduced. Therefore, the sedimentation tank 5 is set to a long strip shape to improve the utilization rate of the inclined tube filler 51, and the sedimentation tank 5 is set in the aerobic tank 4 instead of the vertical partition 42. At the same time, the anaerobic tank 2 is cancelled, and its function is replaced by the original regulating tank 1, so as to further improve the overall integration of the system and reduce the floor space.

[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An underground sewage treatment system, characterized in that: It comprises a regulating tank (1), an anaerobic tank (2), an anoxic tank (3), an aerobic tank (4), a sedimentation tank (5), a filtering tank (6) and a clear water tank (7) which are arranged in sequence along the flow direction of sewage; The regulating tank (1) is provided with a lifting pump (11) connected to a pipeline for lifting sewage to the anaerobic tank (2), the anoxic tank (3) and the aerobic tank (4) respectively; the lower part of the anaerobic tank (2) is connected to the lower part of the anoxic tank (3); the upper part of the anoxic tank (3) is connected to the upper part of the aerobic tank (4); the aerobic tank (4) is provided with a circular flow channel (40) in a horizontal plane; the circular flow channel (40) is provided with a plug flow agitator (41) for unidirectional plug flow agitation of sewage; the upper part of the aerobic tank (4) is connected to the middle part of the sedimentation tank (5); the upper part of the sedimentation tank (5) is connected to the middle part of the filter tank (6); the upper part of the filter tank (6) is connected to the upper part of the clean water tank (7); The invention also comprises a sludge tank (8) and a fan (9). The sludge at the bottom of the sedimentation tank (5) and the bottom of the filter tank (6) are discharged into the sludge tank (8) through a pipeline. The bottom of the sedimentation tank (5) is connected to the bottom of the anaerobic tank (2) and the bottom of the aerobic tank (4) through a pipeline and a one-way valve for controlling the sludge backflow. The bottom of the filter tank (6) is connected to the bottom of the anaerobic tank (2) and the bottom of the aerobic tank (4) through a pipeline and the one-way valve. The bottom of the aerobic tank (4) is connected to the bottom of the anoxic tank (3) through a pipeline and the one-way valve. The fan (9) is connected to the aerobic tank (4), the anaerobic tank (2), the anoxic tank (3), the sedimentation tank (5) and the filter tank (6) through an air pipe and a switch valve.

2. The underground sewage treatment system according to claim 1, characterized in that: The circulation channel (40) is formed by arranging a vertical partition (42) or the sedimentation tank (5) in the middle of the aerobic tank (4).

3. The underground sewage treatment system according to claim 2, characterized in that: Two plug flow agitators (41) are provided, and the two plug flow agitators (41) are respectively arranged on both sides of the vertical partition (42) or the sedimentation tank (5), and the plug flow directions of the two plug flow agitators (41) are opposite.

4. The underground sewage treatment system according to claim 1, characterized in that: The anoxic tank (3) is provided with an anoxic filler (31), the bottom of the aerobic tank (4) is provided with an aeration device (43) connected to the fan (9), the sedimentation tank (5) is provided with an inclined tube filler (51), the filter tank (6) is provided with a filter filler (61), the front end of the clean water tank (7) is provided with an ultraviolet disinfector (71), the clean water tank (7) is provided with a reclaimed water pump (72), and the sludge tank (8) is provided with a filtrate pipe (81).

5. The underground sewage treatment system according to claim 1, characterized in that: The regulating tank (1) is connected to a water inlet pipe (10), and a separator (12) for preliminarily screening water from the water inlet pipe (10) is provided in the regulating tank (1).

6. The underground sewage treatment system according to claim 5, characterized in that: The separator (12) is provided with a grid, a filter screen, a filter cloth and a sand filter material in sequence from top to bottom along the water flow direction.

7. The underground sewage treatment system according to claim 1, characterized in that: The sludge at the bottom of the sedimentation tank (5) and the filtering tank (6) is discharged into the sludge tank (8) by steam stripping.

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