Aerodynamic biochemical treatment system

Abstract

The aerodynamic biochemical treatment system comprises a device main body, and an anaerobic zone, an anoxic zone, an aerobic zone and a secondary sedimentation tank are arranged in the device main body; sealed cavities are formed in the upper parts of the anaerobic zone and the anoxic zone, and perforated aeration pipelines are arranged in the anaerobic zone and the anoxic zone; an aeration part is arranged in the aerobic zone, the lower end of the secondary sedimentation tank is connected with a sludge return pipeline, the other end of the sludge return pipeline is communicated with the anoxic zone, and the sludge return pipeline is connected with a sludge gas stripping pipeline. A gas source for gas stripping is shared with a fan at the aerobic section of the biochemical pool, and a water pump is omitted, so that the aims of saving energy and reducing consumption are fulfilled.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically an aerodynamic biochemical treatment system. Background Technology

[0002] Currently, most domestic sewage or industrial park wastewater is required to meet the Class A discharge standard, which is one of the strictest sewage discharge standards in China. To meet this standard, the biological treatment process basically adopts A2O + secondary sedimentation tank. The anaerobic and anoxic sections of the biological treatment tank mostly use submersible mixers to mix sludge and water. Nitrification liquid return mostly uses through-wall pumps or submersible sewage pumps. The secondary sedimentation tank is generally equipped with a sludge scraper. Sludge return and excess sludge discharge also use water pumps for power sludge removal. All of these methods require a lot of electricity, which is not in line with the current trend of green and low-carbon development in the sewage treatment industry. Summary of the Invention

[0003] The purpose of this invention is to provide an aerodynamic biochemical treatment system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: An aerodynamic biochemical treatment system includes a main body of the device, wherein the main body of the device is provided with an anaerobic zone, an anoxic zone, an aerobic zone, and a secondary sedimentation tank; The anaerobic zone and the anoxic zone are provided with sealed cavities at the top, and perforated aeration pipes are installed in the anaerobic zone and the anoxic zone; the aerobic zone is provided with an aeration section; the lower end of the secondary sedimentation tank is connected to a sludge return pipe, the other end of the sludge return pipe is connected to the anoxic zone, and a sludge airlift pipe is connected to the sludge return pipe.

[0005] As a further embodiment of the present invention: a top plate is provided at the upper end of the anaerobic zone and the anoxic zone, the top plate is sealed to the upper end of the anaerobic zone and the anoxic zone, an exhaust hole is provided on the top plate, the exhaust hole is connected to a demister through a pipe, an aeration fan is connected to the air inlet end of the perforated aeration pipe, and the air outlet end of the demister is connected to the air inlet end of the aeration fan.

[0006] As a further aspect of the present invention: an oxidation-reduction potential meter and a dissolved oxygen meter are installed inside the hypoxic zone.

[0007] As a further aspect of the present invention: the aeration unit includes a liftable aeration pipe disposed in the aerobic zone, the air inlet end of the liftable aeration pipe is connected to an air distribution cylinder through an aeration branch pipe, each air distribution cylinder is connected to at least one aeration branch pipe, each aeration branch pipe is connected to at least one liftable aeration pipe, the air inlet pipe of the aeration branch pipe is connected to an aeration pipe, and the aeration pipe is connected to a blower.

[0008] As a further aspect of the present invention: an air distribution box is connected to the aeration pipe, and the air distribution box is connected to the sludge gas pipe through a sludge return air lift branch pipe.

[0009] As a further aspect of the present invention: a nitrification liquid return pipe is provided in the aerobic zone, the other end of the nitrification liquid return pipe is connected to the anaerobic zone, a nitrification liquid return gas lift branch pipe is connected to the nitrification liquid return pipe, and the nitrification liquid return gas lift branch pipe is connected to the gas distribution box.

[0010] As a further aspect of the present invention: the secondary sedimentation tank is a box-shaped structure with an open top, the secondary sedimentation tank is located in the aerobic zone, the secondary sedimentation tank is made of PP material, and the lower part of the secondary sedimentation tank gradually decreases in width from top to bottom to form a mud bucket shape.

[0011] As a further aspect of the present invention: multiple secondary sedimentation tanks are provided in the aerobic zone, and each secondary sedimentation tank is provided with a water collection branch pipe, and all the water collection branch pipes are connected to a main water collection pipe.

[0012] As a further aspect of the present invention: a water inlet trough is provided at the upper end of the water collection branch pipe, the bottom of the water inlet trough is a sloping structure, and a water inlet is provided at the position of the water collection branch pipe near the bottom of the sloping water inlet trough. The bottom of the sloping water inlet trough is connected to the water inlet at the upper end of the water collection branch pipe.

[0013] As a further aspect of the present invention, a main water inlet is provided on one side of the anaerobic zone.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The anaerobic and anoxic zones of the biological treatment tank in this application adopt a closed design. The air in the remaining space above the anaerobic and anoxic zones is drawn out by the blower to the anaerobic and anoxic zones for aeration and mixing. There is no increase in dissolved oxygen in the water, thereby achieving mud-water mixing, full contact between bacteria and sewage, and anaerobic, anoxic and facultative anaerobic bacteria can exert their maximum potential.

[0015] 2. The secondary sedimentation tank of this application is located in the middle of the aerobic zone, making reasonable use of the external slope of the secondary sedimentation tank as the aerobic zone. Under the same space, the aerobic reaction time is increased, thereby improving the water quality of the effluent. The secondary sedimentation tank is assembled by forming a mud hopper with PP board, which is convenient for construction and saves costs.

[0016] 3. In this application, the nitrification liquor recirculation, the sludge recirculation of the secondary sedimentation tank, and the discharge of excess sludge are all achieved by air lifting, thereby realizing the nitrification liquor recirculation, sludge recirculation, and discharge of excess sludge. The air source for air lifting is shared with the blower of the aerobic section of the biological treatment tank, eliminating the need for a water pump, thus achieving the purpose of energy saving and consumption reduction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of this embodiment; Figure 2 This is a schematic diagram of the internal structure of this embodiment; Figure 3 This is a cross-sectional view of the aerobic zone and secondary sedimentation tank in this embodiment; Figure 4 This is a schematic diagram of the sedimentation tank structure in Embodiment 2. Figure 5 This is a cross-sectional view of the sedimentation tank in Embodiment 2.

[0018] In the diagram: 1-Main body of the device, 2-Main inlet, 3-Anaerobic zone, 4-Anoxic zone, 5-Aerobic zone, 6-Secondary sedimentation tank, 7-Air distribution cylinder, 8-Air distribution box, 9-Perforated aeration pipe, 10-Liftable aeration pipe, 11-Aeration pipe, 12-Nitrified liquid return air lift branch pipe, 13-Nitrified liquid return pipe, 14-Sludge return air lift branch pipe, 15-Sludge return pipe, 16-Water collection branch pipe, 17-Water collection main pipe, 18-Inlet, 19-Inlet trough, 20-Aeration branch pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1-2 In this embodiment of the invention, an aerodynamic biochemical treatment system includes a device body 1, which contains an anaerobic zone 3, an anoxic zone 4, an aerobic zone 5, and a secondary sedimentation tank 6. A main water inlet 2 is provided on one side of the anaerobic zone 3.

[0021] The anaerobic zone 3 and the anoxic zone 4 are provided with sealed cavities at their upper parts. Perforated aeration pipes 9 are installed inside the anaerobic zone 3 and the anoxic zone 4. In this embodiment, a top plate is provided at the upper end of the anaerobic zone 3 and the anoxic zone 4. The top plate is sealed to the upper end of the anaerobic zone 3 and the anoxic zone 4. An exhaust hole is provided on the top plate. The exhaust hole is connected to a demister through a pipe. An aeration fan is connected to the air inlet end of the perforated aeration pipe 9. The air outlet end of the demister is connected to the air inlet end of the aeration fan. An oxidation-reduction potential meter and a dissolved oxygen meter are installed inside the anoxic zone 4.

[0022] An aeration unit is provided in the aerobic zone 5. The aeration unit includes a liftable aeration pipe 10 located in the aerobic zone 5. The air inlet of the liftable aeration pipe 10 is connected to a distribution cylinder 7 via an aeration branch pipe 20. Each distribution cylinder 7 is connected to at least one aeration branch pipe 20. Each aeration branch pipe 20 is connected to at least one liftable aeration pipe 10. The air inlet of the aeration branch pipe 20 is connected to an aeration pipe 11. The aeration pipe 11 is connected to a blower. An air distribution box 8 is connected to the aeration pipe 11. The air distribution box 8 is connected to the sludge gas pipeline via a sludge return air lift branch pipe 14.

[0023] like Figure 3-5 As shown, the secondary sedimentation tank 6 is a box-shaped structure with an open top. The secondary sedimentation tank 6 is located in the aerobic zone 5. In this embodiment, the secondary sedimentation tank 6 is made of PP material. The lower part of the secondary sedimentation tank 6 gradually narrows from top to bottom to form a mud bucket shape. Multiple secondary sedimentation tanks 6 are set in the aerobic zone 5. Each secondary sedimentation tank 6 is equipped with a water collection branch pipe 16. All water collection branch pipes 16 are connected to the water collection main pipe 17. A water inlet trough 19 is set at the upper end of the water collection branch pipe 16. The bottom of the water inlet trough 19 is a sloping structure. The water inlet 18 is set at the position of the water collection branch pipe 16 near the bottom of the slope of the water inlet trough 19. The bottom of the slope of the water inlet trough 19 is connected to the water inlet 18 at the upper end of the water collection branch pipe.

[0024] The lower end of the secondary sedimentation tank 6 is connected to a sludge return pipe 15, the other end of which is connected to the anoxic zone 4. A sludge air lift pipe is connected to the sludge return pipe 15. A nitrified liquid return pipe 13 is installed in the aerobic zone 5, the other end of which is connected to the anaerobic zone 3. A nitrified liquid return air lift branch pipe 12 is connected to the nitrified liquid return air lift branch pipe 12, which is connected to the gas distribution box 8. The gas distribution box 8 is equipped with a gas flow meter and a solenoid valve for controlling the air lift. The gas distribution box 8 rationally distributes the gas source to the nitrified liquid return air lift gas source and the secondary sedimentation tank sludge return gas source by controlling the pneumatic or electric valve and the solenoid valve. The gas source can accurately supply gas at various locations. The pipe diameter and number of pipes of the nitrified liquid return pipe and the air lift pipe inside the secondary sedimentation tank can be calculated and set according to the actual treatment volume. A dissolved oxygen meter and a sludge concentration meter are installed in the aerobic zone (if contact oxidation is used, they can be omitted).

[0025] Depending on the influent conditions, this device can be designed with fillers for anaerobic, anoxic, and aerobic zones. The fillers can be of various forms, such as elastic fillers, combined fillers, braided fillers, and suspended fillers. If suspended fillers are used, an interception net must be installed to prevent the fillers from being lost.

[0026] In operation, wastewater enters the device through the main inlet 2, passing sequentially through the anaerobic zone 3, the anoxic zone 4, and the aerobic zone 5. Within the anaerobic and anoxic zones 3 and 4, the perforated aeration pipes 9 at the bottom provide uniform aeration, creating a essentially sealed environment. The air above the anaerobic and anoxic zones 3 and 4 serves as the aeration and mixing air source, aerating and stirring the incoming water. Upon entering the aerobic zone 5, the liftable aeration pipes 10 at the bottom of the aerobic zone 5 begin uniform aeration. Utilizing the external slope of the secondary sedimentation tank 6 as the aerobic zone 5 increases the aerobic reaction time within the same space, improving the effluent quality. After passing through the aerobic zone 5, the wastewater enters the secondary sedimentation tank 6, where static sedimentation occurs. Part of the bottom sludge is discharged through the excess sludge pipe, and another part returns to the front end of the device through the sludge return pipe 15. The upper clear liquid enters the collection branch pipe through the outlet trough, then through the collection branch pipe into the main collection pipe, and finally exits the tank body. The air distribution cylinder 7, located outside the aerobic zone 5, distributes air evenly to provide aeration for the liftable aeration pipe at the bottom of the aerobic zone 5. The air distribution box 8 is equipped with a gas flow meter and solenoid valve to control the air lift. The intelligent air distribution box rationally distributes the air source to the nitrification liquid return air lift air source, the secondary sedimentation tank sludge return air source, and the excess sludge air lift discharge source by controlling pneumatic or electric valves and solenoid valves. The air source can accurately supply air at each location.

[0027] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An aerodynamic biochemical treatment system, comprising a main body (1), characterized in that, The main body (1) of the device is provided with an anaerobic zone (3), an anoxic zone (4), an aerobic zone (5), and a secondary sedimentation tank (6); The anaerobic zone (3) and the anoxic zone (4) are provided with sealed cavities at the top. The anaerobic zone (3) and the anoxic zone (4) are provided with perforated aeration pipes (9). The aerobic zone (5) is provided with an aeration section. The lower end of the secondary sedimentation tank (6) is connected to a sludge return pipe (15). The other end of the sludge return pipe (15) is connected to the anoxic zone (4). The sludge return pipe (15) is connected to a sludge airlift pipe.

2. The aerodynamic biochemical treatment system according to claim 1, characterized in that, The anaerobic zone (3) and the anoxic zone (4) are provided with a top plate at the upper end. The top plate is sealed to the upper end of the anaerobic zone (3) and the anoxic zone (4). The top plate is provided with an exhaust hole. The exhaust hole is connected to a demister through a pipe. The air inlet end of the perforated aeration pipe (9) is connected to an aeration fan. The air outlet end of the demister is connected to the air inlet end of the aeration fan.

3. The aerodynamic biochemical treatment system according to claim 1, characterized in that, The hypoxic zone (4) is equipped with an oxidation-reduction potential meter and a dissolved oxygen meter.

4. The aerodynamic biochemical treatment system according to claim 1, characterized in that, The aeration unit includes a liftable aeration pipe (10) disposed in the aerobic zone (5). The air inlet end of the liftable aeration pipe (10) is connected to a distribution cylinder (7) through an aeration branch pipe (20). Each distribution cylinder (7) is connected to at least one aeration branch pipe (20). Each aeration branch pipe (20) is connected to at least one liftable aeration pipe (10). The air inlet pipe of the aeration branch pipe (20) is connected to an aeration pipe (11). The aeration pipe (11) is connected to a blower.

5. The aerodynamic biochemical treatment system according to claim 4, characterized in that, An air distribution box (8) is connected to the aeration pipe (11), and the air distribution box (8) is connected to the sludge gas pipe through the sludge return air lift branch pipe (14).

6. The aerodynamic biochemical treatment system according to claim 5, characterized in that, The aerobic zone (5) is provided with a nitrification liquid return pipe (13), the other end of which is connected to the anaerobic zone (3). A nitrification liquid return gas lift branch pipe (12) is connected to the nitrification liquid return pipe (13), and the nitrification liquid return gas lift branch pipe (12) is connected to the gas distribution box (8).

7. The aerodynamic biochemical treatment system according to claim 1, characterized in that, The secondary sedimentation tank (6) is a box-shaped structure with an open top. The secondary sedimentation tank (6) is located in the aerobic zone (5). The secondary sedimentation tank (6) is made of PP material. The lower part of the secondary sedimentation tank (6) gradually decreases in width from top to bottom to form a mud bucket shape.

8. The aerodynamic biochemical treatment system according to claim 1, characterized in that, The aerobic zone (5) is equipped with multiple secondary sedimentation tanks (6), each of which is equipped with a water collection branch pipe (16), and all of the water collection branch pipes (16) are connected to a main water collection pipe (17).

9. An aerodynamic biochemical treatment system according to claim 8, characterized in that, The upper end of the water collection branch pipe (16) is provided with a water inlet trough (19), the bottom of the water inlet trough (19) is a sloping structure, and the water collection branch pipe (16) is provided with a water inlet (18) near the bottom of the sloping water inlet trough (19). The bottom of the sloping water inlet trough (19) is connected to the water inlet (18) at the upper end of the water collection branch pipe.

10. An aerodynamic biochemical treatment system according to claim 1, characterized in that, A main inlet (2) is provided on one side of the anaerobic zone (3).

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