Urban domestic sewage treatment system

Abstract

The utility model provides an urban domestic sewage treatment system which comprises a grit chamber, a CASS system, a buffer tank, an NCC system and a disinfection tank which are connected in sequence, a lifting pump is arranged at the front end of the grit chamber, sewage enters the grit chamber through the lifting pump, and sludge tanks are arranged at the rear ends of the CASS system and the NCC system. The CASS technology and the NCC system are combined, urban domestic sewage is treated, and the removal effect on ammonia nitrogen, total phosphorus and CODCr in polluted water is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of sewage treatment, and in particular relates to an urban domestic sewage treatment system. Background Technology

[0002] As a basic substance essential for human life and health, water is a fundamental guarantee for maintaining human survival and development, social civilization and progress, and an indispensable strategic resource for social existence and development.

[0003] Water pollution refers to the concentration of harmful substances in water exceeding the background levels and environmental capacity, leading to changes in the physicochemical and microbiological properties of the water body and thus damaging its ecosystem and functions. In China, with the construction of new socialist countryside and the acceleration of rural urbanization, water pollution problems are worsening. Rivers, lakes, surface water, and groundwater are all polluted to varying degrees.

[0004] Due to a lack of sewage treatment facilities, drainage pipes, and corresponding regulations, large amounts of untreated urban sewage are discharged indiscriminately. This discharged sewage may flow into low-lying areas such as streets, ditches, ponds, reservoirs, and rivers, containing large amounts of bacteria and viruses. Such polluted surface water may be severely affected in the long term, and in turn, affect groundwater sources through infiltration.

[0005] CASS (Completely Filtered Assay) water treatment technology is a modified SBR (Self-Biochemical Batch Reactor) process, characterized by its simple composition, flexible operation, and high reliability. It is primarily used for treating polluted water bodies with high organic pollutant content and requiring nitrogen and phosphorus removal, and is commonly used to treat municipal sewage and some industrial wastewater. However, CASS technology faces challenges in improving biological nitrogen and phosphorus removal efficiency and requires precise adjustments to adapt to fluctuations in influent water quality. Utility Model Content

[0006] In view of this, the present invention aims to propose an urban domestic sewage treatment system that combines the CASS process and the NCC system to treat urban domestic sewage, thereby further improving the removal efficiency of ammonia nitrogen, total phosphorus and CODCr in polluted water bodies.

[0007] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0008] A municipal wastewater treatment system includes a grit chamber, a CASS (Concentrated Aerated Sludge Settling) system, a buffer tank, an NCC (Natural Cultivation and Control) system, and a disinfection tank, all connected sequentially. A lift pump is installed at the front end of the grit chamber, through which wastewater enters. A sludge tank is installed at the rear end of both the CASS and NCC systems. The grit chamber settles suspended solids, the sludge tank collects and dries sludge discharged from the CASS and NCC systems, and the disinfection tank disinfects the water treated by the NCC system. The disinfected water is discharged after passing quality tests.

[0009] Furthermore, the NCC system is provided with a processing pool, the top of which is provided with a cover; the cover is provided with a first partition and a second partition in sequence, and the bottom of the processing pool is provided with a third partition and a fourth partition in sequence.

[0010] There are gaps between the first and second partitions and the bottom of the treatment tank;

[0011] There are gaps between the third and fourth partitions and the cover;

[0012] The third baffle is located between the left side wall of the treatment tank and the first baffle, and the fourth baffle is located between the first baffle and the second baffle;

[0013] A rapid filtration zone is formed between the right sidewall of the treatment tank and the fourth baffle; an aerobic digestion zone is formed between the fourth baffle and the third baffle; and a phosphorus removal zone is formed between the third baffle and the left sidewall of the treatment tank.

[0014] Furthermore, the rapid filtration area is provided with a filter layer and a support layer, which are arranged from top to bottom between the second partition and the right side wall of the treatment tank.

[0015] Preferably, the filter layer is made of quartz sand.

[0016] Furthermore, the top of the rapid filtration area is provided with a water inlet pipe, which is located between the second partition and the right side wall of the treatment tank.

[0017] Furthermore, the aerobic digestion area is provided with a calcium-based packing assembly, a carbon-based packing assembly, a first aeration assembly, and a first stirring system. The calcium-based packing assembly, the carbon-based packing assembly, and the first aeration assembly are arranged sequentially from top to bottom between the first partition and the fourth partition. The first stirring system is located above the aerobic digestion area and is located between the first partition and the fourth partition.

[0018] The first stirring system includes a first motor and a first stirring rod. The fixed end of the first motor is mounted on the cover, and the output end of the first motor is connected to the first stirring rod. The first stirring rod is positioned between the first partition and the fourth partition.

[0019] The calcium-based filter media assembly includes calcium-based filter media and a first filter support mesh;

[0020] The carbon-based filter media assembly includes carbon-based filter media and a second filter support mesh;

[0021] The first and second filter support nets are arranged sequentially from top to bottom between the first and fourth partition plates. Carbon-based fillers are arranged on the second filter support net, and calcium-based fillers are arranged on the first filter support net.

[0022] Preferably, the calcium-based filler is high-calcium fly ash ceramsite, and the carbon-based filler is bio-enzyme charcoal.

[0023] Furthermore, the phosphorus removal area is equipped with a phosphorus removal carbon-based packing assembly, a second aeration assembly, and a second stirring system. The phosphorus removal carbon-based packing assembly and the second aeration assembly are arranged from top to bottom between the left side wall of the treatment tank and the third partition; the second stirring system is located above the phosphorus removal area.

[0024] The second stirring system includes a second motor and a second stirring rod. The fixed end of the second motor is mounted on the cover, and the output end of the second motor is connected to the second stirring rod. The second stirring rod is located between the left side wall of the treatment tank and the third partition.

[0025] The phosphorus removal carbon-based packing assembly includes phosphorus removal carbon-based packing and a third filter support mesh. The third filter support mesh is located between the left side wall of the treatment tank and the third partition, and the phosphorus removal carbon-based packing is placed on the third filter support mesh.

[0026] Furthermore, a water outlet pipe is provided at the bottom of one side of the phosphorus removal area, and a water pump is installed on the water outlet pipe.

[0027] Furthermore, both the first aeration component and the second aeration component include a plurality of aeration pipes, a plurality of aeration discs on the aeration pipes, a plurality of aeration holes on the aeration discs, and the aeration pipes are connected to an air source.

[0028] Compared with existing technologies, the urban domestic sewage treatment system described in this utility model has the following advantages:

[0029] (1) The urban domestic sewage treatment system described in this utility model combines the CASS process and the NCC system to treat urban domestic sewage, further improving the removal effect of ammonia nitrogen, total phosphorus and CODCr in polluted water bodies;

[0030] (2) The filter layer of the rapid filtration area of ​​this utility model, in conjunction with the backwashing system, can intercept the main suspended solids carried in the water, including a portion of the sludge from the CASS system;

[0031] (3) The aerobic digestion zone of this utility model is filled with carbon-based packing components and aeration pipes are laid at the bottom to supply oxygen. At the same time, some calcium-based packing components are also used for supplementation, which can carry out biological oxidation treatment of pollutants such as BOD5, CODCr, and ammonia nitrogen in sewage.

[0032] (4) The phosphorus removal area described in this utility model is filled with a phosphorus removal carbon-based packing component, and the total phosphorus in the wastewater is physically adsorbed and biologically absorbed by bottom aeration. Attached Figure Description

[0033] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0034] Figure 1 This is a schematic diagram of an overall urban domestic sewage treatment system according to an embodiment of the present utility model;

[0035] Figure 2 This is a schematic diagram of an NCC system in an urban domestic sewage treatment system according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Grit chamber; 2. CASS system; 3. Buffer tank; 4. NCC system; 5. Disinfection tank; 6. Lift pump; 7. Sludge tank; 8. Treatment tank; 9. Cover; 10. First baffle; 11. Second baffle; 12. Third baffle; 13. Fourth baffle; 14. Filter layer; 15. Support layer; 16. Inlet pipe; 17. Calcium-based packing assembly; 18. Carbon-based packing assembly; 19. First aeration assembly; 20. First mixing system; 21. First motor; 22. First stirring rod; 23. Phosphorus removal carbon-based packing assembly; 24. Second aeration assembly; 25. Second mixing system; 26. Second motor; 27. Second stirring rod; 28. Outlet pipe; 29. ​​Water pump. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0039] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] like Figures 1 to 2 As shown, a municipal wastewater treatment system includes a grit chamber 1, a CASS system 2, a buffer tank 3, an NCC system 4, and a disinfection tank 5, which are connected sequentially. A lift pump 6 is installed at the front end of the grit chamber 1, through which wastewater enters the grit chamber 1. A sludge tank 7 is installed at the rear end of the CASS system 2 and the NCC system 4. The function of the grit chamber 1 is to settle suspended solids. The function of the sludge tank 7 is to collect and dry the sludge discharged from the CASS system 2 and the NCC system 4. The function of the disinfection tank 5 is to disinfect the water treated by the NCC system 4. The disinfected water can be discharged after passing quality tests.

[0043] The NCC system 4 is provided with a processing pool 8, and a cover 9 is provided on the top of the processing pool 8; a first partition 10 and a second partition 11 are provided on the cover 9 in sequence, and a third partition 12 and a fourth partition 13 are provided on the bottom of the processing pool 8 in sequence.

[0044] There are gaps between the first partition 10, the second partition 11 and the bottom of the treatment tank 8;

[0045] There are gaps between the third partition 12, the fourth partition 13 and the cover 9;

[0046] The third partition 12 is disposed between the left side wall of the treatment tank and the first partition 10, and the fourth partition 13 is disposed between the first partition 10 and the second partition 11.

[0047] A rapid filtration zone is formed between the right sidewall of the treatment tank 8 and the fourth baffle 13, an aerobic digestion zone is formed between the fourth baffle 13 and the third baffle 12, and a phosphorus removal zone is formed between the third baffle 12 and the left sidewall of the treatment tank 8.

[0048] The rapid filtration area is provided with a filter layer 14 and a support layer 15, which are arranged from top to bottom between the second partition 11 and the right side wall of the treatment tank 8.

[0049] Preferably, the filter layer 14 is made of quartz sand.

[0050] The top of the rapid filtration area is provided with a water inlet pipe 16, which is located between the second partition 11 and the right side wall of the treatment tank 8.

[0051] The aerobic digestion area is provided with a calcium-based packing assembly 17, a carbon-based packing assembly 18, a first aeration assembly 19, and a first stirring system 20. The calcium-based packing assembly 17, the carbon-based packing assembly 18, and the first aeration assembly 19 are arranged from top to bottom between the first partition 10 and the fourth partition 13. The first stirring system 20 is located above the aerobic digestion area and is located between the first partition 10 and the fourth partition 13.

[0052] The first stirring system 20 includes a first motor 21 and a first stirring rod 22. The fixed end of the first motor 21 is disposed on the cover 9, and the output end of the first motor 21 is connected to the first stirring rod 22. The first stirring rod 22 is disposed between the first partition 10 and the fourth partition 13.

[0053] Calcium-based filler assembly 17 includes calcium-based filler and a first filter support mesh;

[0054] Carbon-based filler assembly 18 includes carbon-based filler and a second filter support mesh;

[0055] The first filter support mesh and the second filter support mesh are arranged from top to bottom between the first partition 10 and the fourth partition 13. Carbon-based filler is arranged on the second filter support mesh, and calcium-based filler is arranged on the first filter support mesh.

[0056] Preferably, the calcium-based filler is high-calcium fly ash ceramsite, and the carbon-based filler is bio-enzyme charcoal.

[0057] The phosphorus removal area is equipped with a phosphorus removal carbon-based packing assembly 23, a second aeration assembly 24, and a second stirring system 25. The phosphorus removal carbon-based packing assembly 23 and the second aeration assembly 24 are arranged from top to bottom between the left side wall of the treatment tank 8 and the third partition 12; the second stirring system 25 is located above the phosphorus removal area.

[0058] The second stirring system 25 includes a second motor 26 and a second stirring rod 27. The fixed end of the second motor 26 is mounted on the cover 9, and the output end of the second motor 26 is connected to the second stirring rod 27. The second stirring rod 27 is located between the left side wall of the treatment tank 8 and the third partition 12.

[0059] The phosphorus removal carbon-based packing assembly 23 includes phosphorus removal carbon-based packing and a third filter support mesh. The third filter support mesh is located between the left side wall of the treatment tank 8 and the third partition 12, and the phosphorus removal carbon-based packing is located on the third filter support mesh.

[0060] A water outlet pipe 28 is provided at the bottom of one side of the phosphorus removal area, and a water pump 29 is provided on the water outlet pipe 28.

[0061] Both the first aeration component 19 and the second aeration component 24 include a plurality of aeration pipes, a plurality of aeration discs on the aeration pipes, a plurality of aeration holes on the aeration discs, and the aeration pipes are connected to an air source.

[0062] In practice, wastewater enters grit chamber 1 via lift pump 6. Grit chamber 1 settles suspended solids in the wastewater and then removes sludge. The wastewater then enters CASS system 2 for preliminary treatment. The discharged sludge enters sludge tank 7. The pre-treated wastewater passes through buffer tank 3 and enters rapid filtration zone via inlet pipe 16. The filter layer 14 in the rapid filtration zone, in conjunction with a backwashing system, traps the main suspended solids in the water. After filtration, the wastewater enters the aerobic digestion zone, where it undergoes calcium-based... The packing assembly 17 and the carbon-based packing assembly 18, together with the first aeration assembly 19 for oxygen supply and the first stirring system 20 for mixing, perform biological oxidation treatment on pollutants such as BOD5, CODcr, and ammonia nitrogen in the wastewater. The treated wastewater enters the phosphorus removal zone, where the phosphorus removal carbon-based packing assembly 23, together with the second aeration assembly 24 for aeration and the second stirring system 25 for mixing, performs physical adsorption and biological absorption of total phosphorus in the wastewater. The adsorbed wastewater enters the disinfection tank 5 through the effluent pipe 28, and can be discharged after testing and meeting the standards.

[0063] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A system for treating municipal domestic sewage, characterised in that: It comprises a grit chamber (1), a CASS system (2), a buffer tank (3), an NCC system (4) and a disinfection tank (5), wherein the grit chamber (1), the CASS system (2), the buffer tank (3), the NCC system (4) and the disinfection tank (5) are sequentially connected. The front end of the grit chamber (1) is provided with a lifting pump (6), sewage enters the grit chamber (1) through the lifting pump (6), and the rear end of the CASS system (2) and the NCC system (4) is provided with a sludge tank (7).

2. A system for treating municipal wastewater according to claim 1, characterized in that: The NCC system (4) is provided with a treatment tank (8), the top of the treatment tank (8) is provided with a cover (9), the cover (9) is sequentially provided with a first partition plate (10) and a second partition plate (11), and the bottom of the treatment tank (8) is sequentially provided with a third partition plate (12) and a fourth partition plate (13). There is a gap between the first partition plate (10), the second partition plate (11) and the bottom of the treatment tank (8). There is a gap between the third partition plate (12), the fourth partition plate (13) and the cover (9). The third partition plate (12) is arranged between the left side wall of the treatment tank and the first partition plate (10), and the fourth partition plate (13) is arranged between the first partition plate (10) and the second partition plate (11). The right side wall of the treatment tank (8) and the fourth partition plate (13) form a rapid filtration area, the fourth partition plate (13) and the third partition plate (12) form an aerobic digestion area, and the third partition plate (12) and the left side wall of the treatment tank (8) form a phosphorus removal area.

3. A municipal domestic wastewater treatment system according to claim 2, characterised in that: The rapid filtration area is provided with a filter layer (14) and a support layer (15), which are sequentially arranged from top to bottom between the second partition plate (11) and the right side wall of the treatment tank (8).

4. The system for treating municipal wastewater according to claim 2, wherein: The top of the rapid filtration area is provided with a water inlet pipe (16), and the water inlet pipe (16) is arranged between the second partition plate (11) and the right side wall of the treatment tank (8).

5. A system for treating municipal wastewater according to claim 2, wherein: The aerobic digestion area is provided with a calcium filler assembly (17), a carbon filler assembly (18), a first aeration assembly (19) and a first stirring system (20), which are sequentially arranged from top to bottom between the first partition plate (10) and the fourth partition plate (13). The first stirring system (20) is arranged above the aerobic digestion area and between the first partition plate (10) and the fourth partition plate (13). The first stirring system (20) comprises a first motor (21) and a first stirring rod (22), the fixed end of the first motor (21) is arranged on the cover (9), the output end of the first motor (21) is connected with the first stirring rod (22), and the first stirring rod (22) is arranged between the first partition plate (10) and the fourth partition plate (13). The calcium filler assembly (17) comprises calcium filler and a first filter support net, and the carbon filler assembly (18) comprises carbon filler and a second filter support net. The first filter support net and the second filter support net are sequentially arranged from top to bottom between the first partition plate (10) and the fourth partition plate (13), the carbon filler is arranged on the second filter support net, and the calcium filler is arranged on the first filter support net.

6. A system for treating municipal wastewater according to claim 2, wherein: The phosphorus removal region is provided with a phosphorus removal carbon filler assembly (23), a second aeration assembly (24) and a second stirring system (25), the phosphorus removal carbon filler assembly (23) and the second aeration assembly (24) are sequentially arranged from top to bottom between the left side wall of the treatment tank (8) and the third partition plate (12); The second stirring system (25) is arranged above the phosphorus removal region; the second stirring system (25) comprises a second motor (26) and a second stirring rod (27), the fixed end of the second motor (26) is arranged on the cover (9), and the output end of the second motor (26) is connected with the second stirring rod (27); The second stirring rod (27) is arranged between the left side wall of the treatment tank (8) and the third partition plate (12); The phosphorus removal carbon filler assembly (23) comprises phosphorus removal carbon fillers and a third filter support net, the third filter support net is arranged between the left side wall of the treatment tank (8) and the third partition plate (12), and the phosphorus removal carbon fillers are arranged on the third filter support net.

7. A system for treating municipal wastewater according to claim 2, wherein: One side of the bottom of the phosphorus removal region is provided with a water outlet pipe (28), and the water outlet pipe (28) is provided with a water pump (29).

8. A municipal domestic wastewater treatment system according to claim 5, characterised in that: The first aeration assembly (19) comprises a plurality of aeration pipes, a plurality of aeration discs are arranged on the aeration pipes, a plurality of aeration holes are arranged on the aeration discs, and the aeration pipes are connected with a gas source.

9. A municipal domestic wastewater treatment system according to claim 6, characterised in that: The second aeration assembly (24) comprises a plurality of aeration pipes, a plurality of aeration discs are arranged on the aeration pipes, a plurality of aeration holes are arranged on the aeration discs, and the aeration pipes are connected with a gas source.

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