Intensive sewage treatment system and method

Abstract

The invention relates to an intensive sewage treatment system which comprises an intensive total tank body, and a sludge discharge zone, an anaerobic zone, an anoxic zone, an aerobic zone and a settling zone are respectively arranged in the tank body from bottom to top; a water inlet distribution pipe is arranged at the bottom of the anaerobic zone; an aeration facility is arranged in the anoxic zone; the settling zone is provided with a gas-cement three-phase separator, a water baffle and a water collecting tank, and the water collecting tank is connected with a water outlet pipe; a sludge discharge pipe is arranged in the sludge discharge area; sewage enters from the water distribution pipe and is discharged from the water outlet pipe after being treated by the system, and residual activated sludge is discharged from the sludge discharge pipe. The invention also relates to a sewage treatment method using the intensive sewage treatment system. The device integrates decarburization, denitrification, dephosphorization and precipitation, and has the characteristics of simple structure, small occupied area, low investment, low energy consumption and high treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of urban and rural sewage treatment, and in particular to an intensive sewage treatment system and method. Background Art

[0002] In the field of sewage treatment, the biological treatment system is the core unit of urban and rural sewage treatment plants, which can effectively remove organic pollutants and simultaneously remove nitrogen and phosphorus. Currently, the most mainstream biological treatment process is the AAO process.

[0003] The defects of the prior art are:

[0004] There are many structures, a large area is occupied, the reflux energy consumption is high, the pipeline system is complex, and the processing efficiency is low. Summary of the invention

[0005] In view of the above problems, the present invention provides an intensive sewage treatment system and method, the purpose of which is to simplify the device structure, save space, reduce investment; improve energy-saving effects, reduce operating costs; and improve sewage treatment efficiency.

[0006] To solve the above problems, the technical solution provided by the present invention is:

[0007] An intensive sewage treatment system comprises an intensively arranged main tank, wherein:

[0008] The interior of the main tank body is provided with a sludge discharge area, an anaerobic area, an anoxic area, an aerobic area and a sedimentation area from bottom to top; the sludge discharge area is used to gather and discharge excess sludge; the anaerobic area is used to make the polyphosphate bacteria in the activated sludge entering the area release phosphorus and decompose the easily degradable organic matter in the sewage; the anoxic area is used to convert the nitrate nitrogen in the mud and water mixture into nitrogen gas through biological denitrification and escape into the atmosphere, thereby achieving the purpose of denitrification; the aerobic area is used to decompose and nitrify the organic matter in the mud and water mixture, and at the same time the polyphosphate bacteria absorb excessive phosphorus, and remove the phosphorus through the discharge of excess sludge; the sedimentation area is used for mud and water separation, so that the supernatant is discharged from the main tank body, and the sludge flows back to the main tank body.

[0009] Preferably, the overall pool body is a circular pool body or a square pool body.

[0010] Preferably, a water distribution pipe is provided at the bottom of the anaerobic zone; a water inlet pipe passes through the outer wall of the lower part of the main tank body and is connected with the water distribution pipe; the water distribution pipes are evenly distributed at the bottom of the anaerobic zone; and water distribution holes are provided on the water distribution pipes.

[0011] Preferably, the anoxic zone is provided with an aeration facility; the aeration facility comprises an aeration pipe and an aeration head; the aeration head is arranged in the middle area of ​​the anoxic zone.

[0012] Preferably, the sedimentation area is provided with an air-cement three-phase separator, a water baffle and a water collecting trough; the water baffle is arranged in an annular shape directly above the air-cement three-phase separator; the water collecting trough is arranged in an annular shape on the inner wall of the upper part of the main tank body, and is connected to the water outlet pipe passing through the outer wall of the upper part of the main tank body.

[0013] Preferably, the mud discharge area is in an inverted cone shape, and a mud discharge pipe is provided at the bottom of the cone.

[0014] A method utilizing the intensive sewage treatment system comprises the following steps:

[0015] S100. A circulating flow is formed between the rising water flow, the aerated rising air flow and the descending mud water in the total pool body; the fluid in the circulating flow is turbulent, so that the bubbles are aggregated and broken, and the air-mud interface is frequently updated to achieve mass and energy transfer between the phases;

[0016] S200. After the sewage enters the anaerobic zone through the water distribution pipe, it is mixed with the descending sludge in the state of the circulating flow to perform anaerobic biochemical treatment to release phosphorus and decompose organic matter in the sewage;

[0017] S300. The anaerobic treated sewage in the anaerobic zone flows upward to the anoxic zone, and then mixes with the nitrate nitrogen that flows back to the anoxic zone through the circulating flow, and anoxic biochemical treatment of denitrification and denitrification occurs;

[0018] S400. The wastewater after denitrification and denitrification treatment in the anoxic zone flows upward to the aerobic zone, and then undergoes aerobic biochemical treatment for decomposing organic matter, nitrification and absorbing phosphorus;

[0019] S500. The sewage in the aerobic zone that has undergone aerobic biochemical treatment flows upward to the sedimentation zone, and after flowing through the gas-cement three-phase separator, the sludge with a higher specific gravity settles downward and flows back; the gas with a lower specific gravity moves upward and overflows from the water surface; the mud-water mixture flowing upward overflows from the top of the gas-cement three-phase separator, and then passes downward through the bottom of the water baffle under the guiding action of the water baffle; the sludge with a higher specific gravity flows back along the gas-cement three-phase separator, and then the liquid after the mud-water separation overflows into the water collection tank under the action of water pressure, and then is discharged through the outlet pipe to meet the standards, or is discharged after deep treatment to meet the standards;

[0020] S600. The sludge in the sedimentation zone after the separation of air and water flows back to the aerobic zone, the anoxic zone, the anaerobic zone and the sludge discharge zone in sequence under the action of gravity, and then the remaining activated sludge entering the sludge discharge zone is discharged through the sludge discharge pipe.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1) By adopting an intensive approach, the anaerobic tank, anoxic tank, aerobic tank and secondary sedimentation tank separated in the traditional AAO process are integrated into a single total tank body, so that the device structure is simple, the pipeline system is simple, the land is saved, and the investment is small.

[0023] 2) By utilizing the air lift power and sludge gravity provided by aeration, there is no need to add additional sludge return pumps and stirring devices to achieve sludge return, which has obvious energy-saving effects and low operating costs.

[0024] 3) A stable circulating flow is formed in the system. At the same time, under the synergistic effect of gas stirring and hydraulic shearing, efficient mass and energy transfer between phases is achieved, the gas, sludge and pollutants are fully in contact, the sludge concentration is high, and the sewage treatment is efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an intensive, efficient and low-consumption sewage treatment system provided in an embodiment of the present invention.

[0026] Among them: 1. Main tank body; 2. Water inlet pipe; 3. Water distribution pipe; 4. Anaerobic zone; 5. Anoxic zone; 6. Aeration facilities; 7. Aerobic zone; 8. Sedimentation zone; 9. Three-phase separator; 10. Water retaining plate; 11. Water collecting tank; 12. Water outlet pipe; 13. Mud discharge area; 14. Mud discharge pipe DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0028] like Figure 1 As shown, the intensive sewage treatment system comprises an intensively arranged main tank body 1, wherein:

[0029] The interior of the main tank body 1 is provided with a sludge discharge area 13, an anaerobic area 4, an anoxic area 5, an aerobic area 7 and a sedimentation area 8 from bottom to top; the sludge discharge area 13 is used to gather and discharge excess sludge; the anaerobic area 4 is used to make the polyphosphate bacteria in the activated sludge entering the area release phosphorus and decompose the easily degradable organic matter in the sewage; the anoxic area 5 is used to convert the nitrate nitrogen in the mud and water mixture into nitrogen gas through biological denitrification and escape into the atmosphere, thereby achieving the purpose of denitrification; the aerobic area 7 is used to decompose and nitrify the organic matter in the mud and water mixture, and at the same time the polyphosphate bacteria absorb excessive phosphorus, and remove the phosphorus through the discharge of excess sludge; the sedimentation area 8 is used for mud and water separation, so that the supernatant is discharged from the main tank body, and the sludge is returned to the main tank body 1.

[0030] It should be noted that the overall pool body 1 is a circular pool body or a square pool body.

[0031] It should be noted that a water distribution pipe 3 is provided at the bottom of the anaerobic zone 4; the water inlet pipe 2 passes through the outer wall of the lower part of the main tank body 1 and is connected to the water distribution pipe 3; the water distribution pipe 3 is evenly distributed at the bottom of the anaerobic zone 4; and water distribution holes are provided on the water distribution pipe 3.

[0032] It should be noted that the anoxic zone 5 is provided with an aeration facility 6 ; the aeration facility 6 includes an aeration pipe and an aeration head; and the aeration head is arranged in the middle area of ​​the anoxic zone 5 .

[0033] It should be noted that the sedimentation area 8 is provided with an air-cement three-phase separator 9, a water retaining plate 10 and a water collecting trough 11; the water retaining plate 10 is arranged in a ring directly above the air-cement three-phase separator 9; the water collecting trough 11 is arranged in a ring on the inner wall of the upper part of the main tank body 1, and is connected to the outlet pipe 12 passing through the outer wall of the upper part of the main tank body 1.

[0034] It should be noted that the mud discharge area 13 is in an inverted cone shape, and a mud discharge pipe 14 is provided at the bottom of the cone.

[0035] A method utilizing an intensive sewage treatment system comprises the following steps:

[0036] S100. A circulating flow is formed between the rising water flow, the aerated rising air flow and the descending mud water in the total tank body 1; the fluid turbulence in the circulating flow is intense, so that the bubbles coalesce and break, and the air-mud interface is frequently updated to achieve interphase mass transfer and energy transfer;

[0037] S200. After the sewage enters the anaerobic zone 4 through the water distribution pipe 3, it is mixed with the descending sludge in a circulating flow state to release phosphorus and decompose the organic matter in the sewage for anaerobic biochemical treatment;

[0038] S300. The anaerobic treated sewage in the anaerobic zone 4 flows upward to the anoxic zone 5, and then mixes with the nitrate nitrogen returned to the anoxic zone 5 through the circulating flow, and anoxic biochemical treatment of denitrification and denitrification occurs;

[0039] S400. The wastewater after denitrification and denitrification treatment in the anoxic zone 5 flows upward to the aerobic zone 7, and then undergoes aerobic biochemical treatment for decomposing organic matter, nitrification and absorbing phosphorus;

[0040] S500. The sewage after aerobic biochemical treatment in the aerobic zone 7 flows upward to the sedimentation zone 8, and after flowing through the gas-cement three-phase separator 9, the heavy sludge settles downward and flows back; the light gas moves upward and overflows from the water surface; the upward-flowing mud-water mixture overflows from the top of the gas-cement three-phase separator 9, and then passes downward through the bottom of the water baffle 10 under the guidance of the water baffle 10; the heavy sludge slides back along the gas-cement three-phase separator 9, and then the liquid after the mud-water separation overflows into the water collection tank 1 under the action of water pressure, and then is discharged through the outlet pipe 12 to meet the standards, or is discharged after deep treatment to meet the standards;

[0041] S600. The sludge in the sedimentation zone 8 after the separation of air and water flows back to the aerobic zone 7, the anoxic zone 5, the anaerobic zone 4 and the sludge discharge zone 13 in turn under the action of gravity, and then the remaining activated sludge entering the sludge discharge zone 13 is discharged through the sludge discharge pipe 14.

[0042] It should be noted that the present invention integrates the anaerobic tank, anoxic tank, aerobic tank and secondary sedimentation tank separated in the traditional AAO process into a single total tank body 1 in an intensive manner, with a simple structure, a simple pipeline system, a small footprint and a small investment. By utilizing the air lift power and sludge gravity provided by aeration, there is no need to add a sludge return pump and a stirring device to achieve sludge return, with obvious energy-saving effects and low operating costs. A stable circulating flow is formed in the system, and under the synergistic effect of gas stirring and hydraulic shearing, efficient mass and energy transfer between phases is achieved, the gas, sludge and pollutants are fully in contact, the sludge concentration is high, and the sewage treatment is efficient.

[0043] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0044] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.

[0045] The above description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0046] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An intensive sewage treatment system, characterized in that: A total pool body (1) comprising an intensive arrangement, wherein: The interior of the main tank body (1) is provided with a sludge discharge area (13), an anaerobic area (4), an anoxic area (5), an aerobic area (7) and a sedimentation area (8) from bottom to top; the sludge discharge area (13) is used to collect and discharge excess sludge; the anaerobic area (4) is used to allow the polyphosphate bacteria in the activated sludge entering the area to release phosphorus and decompose easily degradable organic matter in the sewage; the anoxic area (5) is used to convert the nitrate nitrogen in the sludge-water mixture into nitrogen gas through biological denitrification and then escape into the atmosphere; the aerobic area (7) is used to decompose and nitrify the organic matter in the sludge-water mixture, while the polyphosphate bacteria absorb excessive phosphorus and remove the phosphorus through the discharge of excess sludge; the sedimentation area (8) is used to separate sludge and water, so that the supernatant is discharged from the main tank body and the sludge flows back to the main tank body (1).

2. The intensive sewage treatment system according to claim 1, characterized in that: The overall tank body (1) is a circular tank body or a square tank body.

3. The intensive sewage treatment system according to claim 1, characterized in that: A water distribution pipe (3) is provided at the bottom of the anaerobic zone (4); a water inlet pipe (2) passes through the outer wall of the lower part of the main tank body (1) and is connected to the water distribution pipe (3); the water distribution pipe (3) is evenly distributed at the bottom of the anaerobic zone (4); and water distribution holes are provided on the water distribution pipe (3).

4. The intensive sewage treatment system according to claim 1, characterized in that: The anoxic zone (5) is provided with an aeration facility (6); the aeration facility (6) comprises an aeration pipe and an aeration head; the aeration head is arranged in the middle area of ​​the anoxic zone (5).

5. The intensive sewage treatment system according to claim 1, characterized in that: The sedimentation zone (8) is provided with an air-cement three-phase separator (9), a water baffle (10) and a water collecting trough (11); the water baffle (10) is arranged in an annular shape just above the air-cement three-phase separator (9); the water collecting trough (11) is arranged in an annular shape on the inner wall of the upper part of the main tank body (1), and is connected to a water outlet pipe (12) passing through the outer wall of the upper part of the main tank body (1).

6. The intensive sewage treatment system according to claim 1, characterized in that: The mud discharge area (13) is in an inverted cone shape, and a mud discharge pipe (14) is provided at the bottom of the cone.

7. A method using the intensive sewage treatment system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S100. A circulating flow is formed between the rising water flow of the inlet water, the rising aeration air flow and the descending mud water in the main tank body (1); the fluid in the circulating flow is turbulent, so that the bubbles are aggregated and broken, and the air-mud interface is frequently updated, so as to realize mass transfer and energy transfer between the phases; S200. After the sewage enters the anaerobic zone (4) through the water distribution pipe (3), it is mixed with the descending sludge in the state of the circulating flow to perform anaerobic biochemical treatment to release phosphorus and decompose organic matter in the sewage; S300. The anaerobic treated sewage in the anaerobic zone (4) flows upward to the anoxic zone (5), and then mixes with the nitrate nitrogen that flows back to the anoxic zone (5) through the circulating flow, and anoxic biochemical treatment of denitrification and denitrification occurs; S400. The wastewater after denitrification treatment in the anoxic zone (5) flows upward to the aerobic zone (7), and then undergoes aerobic biochemical treatment to decompose organic matter, nitrify and absorb phosphorus; S500. The sewage in the aerobic zone (7) that has undergone aerobic biochemical treatment flows upward to the sedimentation zone (8), and after flowing through the gas-cement three-phase separator (9), the sludge with a higher specific gravity settles downward and flows back; the gas with a lower specific gravity moves upward and overflows from the water surface; the mud-water mixture flowing upward overflows from the top of the gas-cement three-phase separator (9), and then passes downward through the bottom of the water baffle (10) under the guidance of the water baffle (10); the sludge with a higher specific gravity slides down along the gas-cement three-phase separator (9) and flows back, and then the liquid after the mud-water separation overflows into the water collection tank (1) under the action of water pressure, and then is discharged through the outlet pipe (12) to meet the standards, or is discharged after deep treatment to meet the standards; S600. The sludge in the sedimentation zone (8) after the separation of air and water flows back to the aerobic zone (7), the anoxic zone (5), the anaerobic zone (4) and the sludge discharge zone (13) in sequence under the action of gravity, and then the remaining activated sludge entering the sludge discharge zone (13) is discharged through the sludge discharge pipe (14).

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