A sewage treatment device based on VFL-SND

Abstract

The utility model discloses a sewage treatment equipment based on VFL-SND, including box, the box is separated into anaerobic zone, first lack / good oxygen area, second lack / good oxygen area and sedimentation area through the partition that sets up in, anaerobic zone possesses the left side area of box along the longitudinal direction, and the sedimentation area is located in the middle of first lack / good oxygen area and second lack / good oxygen area, and the sedimentation area is surrounded by the partition and forms the square frame, and the passage is left between the sedimentation area right side partition and the inner wall of box, the passage is linked first lack / good oxygen area and second lack / good oxygen area, and the anaerobic zone tail is connected first lack / good oxygen area through the first water outlet pipe of top, and second lack / good oxygen area is connected the sedimentation area through the overflow port of partition top, and the second water outlet pipe is opened in the upper portion of sedimentation area and leads out the clean water after sedimentation, and the sedimentation area bottom has the sludge pipe and removes sludge. The technical effect of the utility model is: can high -efficient hydrolysis acidification organic matter in anaerobic zone, improves denitrification efficiency in lack / good oxygen area, and realizes no -pump energy -conserving reflux.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a wastewater treatment device based on the principle of vertical baffle and air lift reflux, which has both low dissolved oxygen reaction and sludge-water separation functions, and can be widely used in urban wastewater treatment, industrial wastewater treatment and other places. Background Technology

[0002] With the acceleration of urbanization and increasingly stringent environmental protection requirements, urban wastewater treatment, especially the efficient denitrification of wastewater with a low carbon-to-nitrogen ratio, has become a hot topic in the wastewater treatment industry. Most integrated wastewater treatment equipment on the market uses traditional processes such as AAO and SBR, which suffer from problems such as long process flows, large footprint, high energy consumption, reliance on external carbon sources, and low automation.

[0003] Vertical flow labyrinth (VFL) technology offers advantages in energy saving and reduced footprint by constructing vertically deflected flow patterns. However, existing VFL technology equipment suffers from the following structural and control system drawbacks: 1. In terms of the structural layout of the aeration system, traditional aeration devices (such as microporous aeration heads and perforated pipes) have large hole spacing and uneven bubble diameter, resulting in uneven distribution of dissolved oxygen (DO) in the tank. It is impossible to maintain the micro-aerobic environment required for simultaneous nitrification and denitrification (SND) through structural design. 2. In terms of the structure and power of the reflux system, mechanical pumps are generally used for sludge and nitrification liquid reflux. This power equipment has high energy consumption and the reflux path is single and fixed. It cannot be flexibly adjusted by optimizing the structural layout of the reflux point according to process requirements, which limits the improvement of the overall system efficiency. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a wastewater treatment device based on VFL-SND, which can efficiently hydrolyze and acidify organic matter in the anaerobic zone, and maintain a stable micro-aerobic environment in the anoxic / aerobic zone, thereby improving denitrification efficiency. It can also achieve pump-free energy-saving reflux, reduce energy consumption, and thus achieve a low carbon-to-nitrogen ratio effect in wastewater treatment.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A wastewater treatment device based on VFL-SND includes a tank, which is divided into an anaerobic zone, a first anoxic / aerobic zone, a second anoxic / aerobic zone, and a sedimentation zone by vertical partitions. The anaerobic zone occupies the left side of the tank longitudinally. The first anoxic / aerobic zone, the second anoxic / aerobic zone, and the sedimentation zone are arranged side by side laterally. The first anoxic / aerobic zone and the second anoxic / aerobic zone are located on the front and rear sides of the tank. The sedimentation zone is located between the first anoxic / aerobic zone and the second anoxic / aerobic zone. The sedimentation zone is surrounded by partitions to form a square frame. A channel is left between the right partition of the sedimentation zone and the inner wall of the tank, and the channel connects the first anoxic / aerobic zone and the second anoxic / aerobic zone. The tail end of the anaerobic zone is connected to the first anoxic / aerobic zone through a first effluent pipe above it. The second anoxic / aerobic zone is connected to the sedimentation zone through an overflow port at the top of the partition. A second effluent pipe is opened at the top of the sedimentation zone to lead out the clear water after sedimentation. A sludge discharge pipe is located at the bottom of the sedimentation zone to discharge sludge.

[0006] The technical advantages of this invention are: the wastewater treatment process is concentrated inside the tank, reducing the floor space; it can efficiently hydrolyze and acidify organic matter in the anaerobic zone; it maintains a stable micro-aerobic environment in the anoxic / aerobic zone, improving denitrification efficiency; the water body circulates naturally, reducing energy consumption; and the detection and control circuit enables precise control of water treatment indicators. Attached Figure Description

[0007] The accompanying drawings of this utility model are described below: Figure 1 This is a zoning diagram of the wastewater treatment function of this utility model; Figure 2 This is a pipeline layout diagram of this utility model; Figure 3 for Figure 1 Vertical sectional view of AA in the middle; Figure 4 for Figure 1 The vertical sectional view of BB in the middle.

[0008] In the diagram: 1. Anaerobic zone; 11. Vertical guide vane; 12. Inlet pipe; 13. Nitrified liquid gas lift return pipe; 14. First sludge return pipe; 15. First outlet pipe; 2. First anoxic / aerobic zone; 21. First limiting and balancing module; 22. First aeration hose assembly; 23. DO online monitoring probe; 24. pH meter; 25. MLSS online monitoring instrument; 26. PLC controller; 27. Second sludge return pipe; 3. Second anoxic / aerobic zone; 31. Second limit and balance module; 32. Second aeration hose assembly; 33. Third sludge return pipe; 34. Overflow outlet; 4. Sedimentation zone; 41. Vertical flow sedimentation tank; 42. Second effluent pipe; 43. Reflector plate; 44. Sludge discharge pipe; 5. Aeration main pipe; 51. Pneumatic return pipe; 6. Box body; 7. Channel. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings and embodiments: To clearly describe the content of the utility model, this patent application uses directional terms "up", "down", "front", "back", "left", and "right" to distinguish them. The terms "up", "down", "front", "back", "left", and "right" are determined based on the layout of the above drawings. If the actual use direction of this utility model changes, the terminology of the orientation will change accordingly, and this should not be regarded as a limitation on the scope of patent protection.

[0010] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model includes a box body 6. The box body 6 is divided into an anaerobic zone 1, a first anoxic / aerobic zone 2, a second anoxic / aerobic zone 3, and a sedimentation zone 4 by vertical partitions. The anaerobic zone 1 occupies the left side of the box body 6 longitudinally. The first anoxic / aerobic zone 2, the second anoxic / aerobic zone 3, and the sedimentation zone 4 are arranged horizontally side-by-side. The first anoxic / aerobic zone 2 and the second anoxic / aerobic zone 3 are located on the front and rear sides of the box body 6. The sedimentation zone 4 is located between the first anoxic / aerobic zone 2 and the second anoxic / aerobic zone 3. Zone 4 is surrounded by partitions to form a square frame. A channel 7 is left between the partition on the right side of the sedimentation zone 4 and the inner wall of the box 6. The channel 7 connects the first aerobic / anoxic zone 2 and the second aerobic / anoxic zone 3. The tail of the anaerobic zone 1 is connected to the first aerobic / anoxic zone 2 through the first water outlet pipe 15 above. The second aerobic / anoxic zone 3 is connected to the sedimentation zone 4 through the overflow port 34 at the top of the partition. The sedimentation zone 4 has a second water outlet pipe 42 at the top to draw out the clear water after sedimentation. The sedimentation zone 4 has a sludge outlet pipe 44 at the bottom to discharge sludge.

[0011] The anaerobic zone 1 is a vertical flow labyrinth VFL structure. Inside the anaerobic zone 1, there are multiple vertical guide vanes 11 arranged in an alternating high and low staggered manner to form a vertical flow deflection path.

[0012] The bottom of the first aerobic / deficient zone 2 and the second aerobic / deficient zone 3 are respectively fixed with a first aeration hose assembly 22 and a second aeration hose assembly 32. The first aeration hose assembly 22 is installed on a plurality of first limiting and balancing modules 21 arranged at intervals, and the second aeration hose assembly 32 is installed on a plurality of second limiting and balancing modules 31 arranged at intervals. The first aeration hose assembly 22 and the second aeration hose assembly 32 are composed of at least 5 parallel plastic hoses. Each plastic hose has evenly distributed holes with a hole diameter of 0.8-1.2 mm and a hole spacing of 10-15 mm. During aeration, microbubbles are generated. The rising bubbles drive the mixed liquid reflux ratio in the air-lift zone, eliminating the need for a mechanical pump.

[0013] The structure and function of the limiting and balancing modules 21 and 31 are described in Chinese Patent Document CN 117585824 A, which discloses a fully isobaric equalization aeration device and its installation and usage method. The limiting and balancing modules can improve the uniformity of air supply throughout the aeration tank, thereby improving oxygen mass transfer efficiency. like Figure 1 As shown, sedimentation zone 4 comprises a row of vertical flow sedimentation tanks 41 arranged side by side; as Figure 4 As shown, the vertical flow sedimentation tank 41 is divided into two layers from top to bottom: the upper layer is a sedimentation separation zone with a large cross-sectional area, and the lower layer is an inverted conical sludge thickening hopper. The upper sedimentation separation zone provides sufficient cross-sectional area to ensure uniform distribution of the sludge-water mixture and effectively achieve solid-liquid separation; the lower inverted conical sludge thickening hopper is used to collect, compress, and store the settled sludge, and its inclined conical wall facilitates the sludge sliding towards the sludge discharge port at the bottom center of the hopper by gravity. A reflector plate 43 is provided at the center of the partition below the liquid surface in each vertical flow sedimentation tank 41. When the mixed liquid enters the sedimentation tank from the upper layer and flows downward, it first impacts the reflector plate 43. Its functions are twofold: first, to consume the kinetic energy of the incoming water and prevent the water flow from directly impacting the settled sludge layer, thus avoiding sludge uplift; second, to make the water flow evenly diffuse in all directions, thereby forming a stable water flow across the entire cross-section of the sedimentation tank, significantly improving the sludge-water separation efficiency and the quality of the effluent. The bottom of the vertical flow sedimentation tank 41 is inclined to form a trench, which serves as a shallow sedimentation space. A sludge discharge pipe 44 is installed under the trench for discharging sludge. This structural design allows for the natural settling, concentration, and collection of sludge without additional power, providing a high-concentration sludge source for subsequent airlift reflux, thereby ensuring the efficient and stable operation of the entire system.

[0014] like Figure 2 As shown, the top surface of the box is equipped with an aeration main pipe 5, and a pneumatic return pipe 51 is installed around the box. The aeration main pipe 5 is connected to the pneumatic return pipe 51, and the pneumatic return pipe 51 supplies air to the first aeration hose group 22 and the second aeration hose group 32.

[0015] like Figure 2As shown, this utility model also includes an airlift reflux system. The reflux inlet of the first sludge reflux pipe 14 of the airlift reflux system is installed at the bottom of the vertical flow sedimentation tank 41 near the anaerobic zone 1, and the reflux outlet of the first sludge reflux pipe 14 is installed above the inlet area at the front end of the anaerobic zone 1, for refluxing the sludge at the bottom of the vertical flow sedimentation tank near the anaerobic zone to the front end of the anaerobic zone. The reflux inlets of multiple parallel second sludge reflux pipes 27 and third sludge reflux pipes 33 are installed at the bottom of the remaining vertical flow sedimentation tanks 41 away from the anaerobic zone 1, and the reflux outlets of the second sludge reflux pipes 27 and 33 are installed at the bottom of the second anoxic / aerobic zone 2, and the reflux outlets of the third sludge reflux pipes 33 are installed at the bottom of the second anoxic / aerobic zone 3, for refluxing the sludge at the bottom of the vertical flow sedimentation tanks away from the anaerobic zone to the first anoxic / aerobic zone and the second anoxic / aerobic zone, respectively. The nitrified liquid in the upper part of the second non-aerobic / aerobic zone 3 flows into the inlet area at the front end of the anaerobic zone 1 through the nitrified liquid airlift return pipe 13.

[0016] The working process of the airlift reflux system of this utility model is as follows: the sludge at the bottom of the sedimentation zone 4 collects downwards under the action of gravity, and the airlift reflux system uses the rising gas-liquid mixture generated by the aeration hose groups 22 and 32 at the bottom of the first anoxic / aerobic zone 2 and the second anoxic / aerobic zone 3 as the sole power source. When the bubbles rise in the anoxic / aerobic zone, they drive the surrounding fluid to move, thereby forming a negative pressure suction force at the outlet of each reflux pipe connected to it.

[0017] In this system, the sludge at the bottom of the vertical flow sedimentation tank 41, located near the anaerobic zone 1, is airlifted back to the front end of the anaerobic zone 1 via the first sludge return pipe 14. The airlift force comes from the negative pressure suction effect created by the aeration in the first anoxic / aerobic zone 2. Similarly, the airlift effect generated by the aeration in the first anoxic / aerobic zone 2 and the second anoxic / aerobic zone 3 directly sucks up the sludge at the bottom of the remaining vertical flow sedimentation tanks 41, which are far from the anaerobic zone 1, and returns it to their respective areas via the second sludge return pipe 27 and the third sludge return pipe 33, respectively. In addition, the nitrified liquid above the second anoxic / aerobic zone 3 is returned to the front end of the anaerobic zone 1 via the nitrified liquid airlift return pipe 13. This airlift return system overcomes the energy consumption caused by using mechanical pumps for sludge and nitrified liquid return, and its layout with multiple return points improves the overall efficiency of wastewater treatment.

[0018] A DO online monitoring probe 23, a pH meter 24, and an MLSS online monitoring instrument 25, installed on the wall of the first aerobic / anoxic zone 2, monitor water quality parameters in real time and transmit the data to a PLC controller 26. The automatic control logic of this invention is based on the above hardware structure: the PLC controller 26 receives signals from the online monitoring instruments and dynamically adjusts the blower frequency to control the aeration rate through internal program algorithms. Simultaneously, it controls the opening and closing of the sludge discharge valve to maintain optimal sludge concentration. When the DO value exceeds 0.4 mg / L, the frequency is automatically reduced; when the MLSS of the mixed liquor is higher than the set value, sludge discharge is initiated, thereby achieving intelligent and refined operation of the entire system.

[0019] The workflow of this invention is as follows: Wastewater enters the anaerobic zone 1 through the inlet pipe 12, undergoes hydrolysis and acidification in the vertical flow labyrinth structure, overflows into the first anoxic / aerobic zone 2 for preliminary nitrification and denitrification, and then flows into the second anoxic / aerobic zone 3 for further treatment. The treated sludge-water mixture enters the sedimentation zone 4 for separation, and the clear water is discharged through the second outlet pipe 42. Throughout the process, the liquid propulsion, sludge return, and nitrification liquid return are all driven by the airlift effect generated by aeration, eliminating the need for mechanical pumps, and ultimately ensuring that the effluent quality consistently meets the Class A standard.

[0020] The top surface of the box body of this utility model is made of hot-dip galvanized steel grating, and a 10.50-meter-high stainless steel railing is installed around the box body. It is equipped with a ladder with a guard cage for easy maintenance.

[0021] The advantages of this utility model are: 1. By setting up a vertical flow labyrinth anaerobic zone composed of staggered vertical guide vanes, this structure can spontaneously form a composite flow pattern that combines push flow and completely mixed flow, without the need for additional mechanical push flow devices, effectively reducing energy consumption; 2. The vertical flow labyrinth structure is conducive to the formation of granular sludge, which not only enhances the sludge settling performance, but also effectively promotes the hydrolysis and acidification of organic carbon sources in the influent, providing sufficient internal carbon sources for subsequent denitrification. 3. The high-density perforated aeration hose assembly fixed by the limiting and balancing module generates smaller and more evenly distributed bubbles, resulting in extremely uniform dissolved oxygen distribution in the tank. This ensures the stability of the micro-aerobic environment required for simultaneous nitrification and denitrification from a physical structure perspective, thereby significantly improving nitrogen removal efficiency. 4. The mixed liquor circulation, sludge return and nitrification liquor return in the system all adopt the air-lift method, which completely eliminates the need for mechanical return pumps and greatly reduces the energy consumption of system operation; 5. All functional areas are highly integrated into a single cabinet, resulting in a compact structure that reduces the floor space by approximately 50% compared to traditional methods; 6. By combining online monitoring instruments with PLC controllers, automatic and precise control of processes such as aeration and sludge discharge is achieved, reducing manual operation and maintenance costs and effectively adapting to fluctuations in influent water quality; 7. By setting up multiple independent airlift return pipes and optimizing their return endpoints, refined and directional return of sludge and nitrification liquor was achieved. This structural layout can both ensure the sludge concentration in the anaerobic zone and optimize the biochemical reactions in the anoxic / aerobic zones, thereby improving treatment efficiency and stability from a system structure perspective.

Claims

1. A wastewater treatment device based on VFL-SND, comprising a housing (6), characterized in that: The chamber (6) is divided into an anaerobic zone (1), a first aerobic / deficient zone (2), a second aerobic / deficient zone (3), and a sedimentation zone (4) by vertical partitions. The anaerobic zone (1) occupies the left side of the chamber (6) longitudinally. The first aerobic / deficient zone (2), the second aerobic / deficient zone (3), and the sedimentation zone (4) are arranged side by side laterally. The first aerobic / deficient zone (2) and the second aerobic / deficient zone (3) are located on the front and back sides of the chamber (6). The sedimentation zone (4) is located between the first aerobic / deficient zone (2) and the second aerobic / deficient zone (3). The sedimentation zone (4) is enclosed by partitions. A square frame is formed. A channel (7) is left between the partition on the right side of the sedimentation zone (4) and the inner wall of the box (6). The channel (7) connects the first aerobic / non-aerobic zone (2) and the second aerobic / non-aerobic zone (3). The tail of the anaerobic zone (1) is connected to the first aerobic / non-aerobic zone (2) through the first water outlet pipe (15) above. The second aerobic / non-aerobic zone (3) is connected to the sedimentation zone (4) through the overflow port (34) at the top of the partition. The sedimentation zone (4) has a second water outlet pipe (42) at the top to draw out the clear water after sedimentation. The sedimentation zone (4) has a sludge outlet pipe (44) at the bottom to discharge sludge.

2. The wastewater treatment equipment based on VFL-SND according to claim 1, characterized in that: The anaerobic zone (1) is equipped with multiple vertical guide plates (11) arranged in alternating high and low positions to form a vertical flow path.

3. The wastewater treatment equipment based on VFL-SND according to claim 2, characterized in that: The bottom of the first aerobic / deficient zone (2) and the second aerobic / deficient zone (3) are respectively fixed with a first aeration hose assembly (22) and a second aeration hose assembly (32). The first aeration hose assembly (22) is installed on a plurality of first limiting and balancing modules (21) arranged at intervals, and the second aeration hose assembly (32) is installed on a plurality of second limiting and balancing modules (31) arranged at intervals. The first aeration hose assembly (22) and the second aeration hose assembly (32) are both composed of at least 5 parallel plastic hoses, and holes are evenly distributed on each plastic hose.

4. The wastewater treatment equipment based on VFL-SND according to claim 3, characterized in that: The sedimentation zone (4) includes a row of vertical flow sedimentation tanks (41) arranged side by side. The bottom of the vertical flow sedimentation tanks (41) is inclined to form a groove, and a sludge discharge pipe (44) is installed under the groove.

5. The wastewater treatment equipment based on VFL-SND according to claim 4, characterized in that: The vertical flow sedimentation tank (41) is divided into two layers from top to bottom, and a reflector plate (43) is provided at the center of the partition below the liquid surface of each vertical flow sedimentation tank (41).

6. The wastewater treatment equipment based on VFL-SND according to any one of claims 1 to 5, characterized in that: The top surface of the box is equipped with an aeration main pipe (5), and a pneumatic return pipe (51) is installed around the box. The aeration main pipe (5) is connected to the pneumatic return pipe (51), and the pneumatic return pipe (51) supplies air to the first aeration hose group (22) and the second aeration hose group (32).

7. The wastewater treatment equipment based on VFL-SND according to claim 6, characterized in that: It also includes an airlift reflux system, wherein the reflux inlet of the first sludge reflux pipe (14) of the airlift reflux system is installed at the bottom of the vertical flow sedimentation tank (41) near the anaerobic zone (1), the reflux outlet of the first sludge reflux pipe (14) is installed above the front inlet area of ​​the anaerobic zone (1), the reflux inlets of multiple parallel second sludge reflux pipes (27) and third sludge reflux pipes (33) are installed at the bottom of the remaining vertical flow sedimentation tanks (41) away from the anaerobic zone (1), the reflux outlet of the second sludge reflux pipe (27) is installed at the bottom of the first anoxic / aerobic zone (2), and the reflux outlet of the third sludge reflux pipe (33) is installed at the bottom of the second anoxic / aerobic zone (3); the nitrified liquid in the upper part of the second anoxic / aerobic zone (3) flows into the front inlet area of ​​the anaerobic zone (1) through the nitrified liquid airlift reflux pipe (13).

8. The wastewater treatment equipment based on VFL-SND according to claim 7, characterized in that: in The DO online monitoring probe (23), pH tester (24) and MLSS online monitoring instrument (25) installed on the wall of the first aerobic / aerobic zone (2) monitor water quality parameters in real time and transmit the data to the PLC controller (26). The PLC controller (26) receives the signal from the online monitoring instrument and dynamically adjusts the frequency of the blower to control the aeration volume through the internal program algorithm, while controlling the opening and closing of the sludge discharge valve to maintain the optimal sludge concentration.

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