Energy-saving air-lift multi-functional biological denitrification sewage treatment device

Abstract

The application discloses an energy-saving air-lift multifunctional biological denitrification sewage treatment device, which comprises an anoxic adjusting tank, an aerobic tank, a sedimentation tank and an air-lift device; the liquid levels of the aerobic tank, the sedimentation tank and the anoxic adjusting tank are sequentially lowered; the air-lift device is arranged between the aerobic tank and the anoxic adjusting tank; the bottom of the anoxic adjusting tank is communicated with the air-lift device through a pipeline; the air-lift device comprises a shaft, a gas guide pipe, a microporous aerator, a water-lifting pipe and a gas pump; the microporous aerator is arranged at the lower portion of the water-lifting pipe; one end of the gas guide pipe is connected with the gas pump, and the other end of the gas guide pipe extends into the shaft and is communicated with the microporous aerator; the two ends of the water-lifting pipe respectively extend into the bottom of the shaft and correspond to the top of the aerobic tank; one side of the top of the aerobic tank is respectively communicated with a nitrification liquid return pipe and a water outlet pipe; the water outlet pipe is communicated with the sedimentation tank; a water outlet is arranged at the top of the sedimentation tank; and a sludge discharge pipe is arranged at the bottom of the sedimentation tank. The air-lift device is additionally arranged, so that the liquid level of the aerobic tank is the highest, the liquid level of the sedimentation tank is the second, and the liquid level of the anoxic adjusting tank is the lowest. The environmental, economic and social benefits are obvious.

Description

Technical Field

[0001] This invention relates to a domestic sewage treatment facility: an energy-saving airlift multifunctional biological denitrification sewage treatment device. Background Technology

[0002] Currently, rural sewage treatment facilities have the following problems:

[0003] 1. The selected technology is not suitable for the current situation in rural areas, the operation and management are complicated, and professional personnel are required for maintenance, but rural areas lack such personnel;

[0004] 2. Operating costs are too high, and maintenance expenses are difficult to secure. Summary of the Invention

[0005] In summary, to simplify operation and management and reduce maintenance costs, this application provides an energy-saving airlift multifunctional biological denitrification wastewater treatment device. This device is simple to operate and manage, with the air pump start-up and shutdown controlled by the liquid level in the regulating tank. It has a high degree of automation and requires no professional on-site operation. Maintenance costs are low, with only one energy-consuming device—an air pump. Based on an airlift device head of 0.5 meters and a nitrification liquid recirculation ratio of 300%, the energy consumption is approximately 0.45 kWh / t, far lower than the energy consumption level of existing rural wastewater treatment facilities. The environmental, economic, and social benefits are significant.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] An energy-saving, multifunctional biological denitrification wastewater treatment device with airlift capability includes an anoxic regulating tank, an aerobic tank, and a sedimentation tank, as well as an airlift device. The liquid levels in the aerobic tank, sedimentation tank, and anoxic regulating tank decrease sequentially. An airlift device is installed between the aerobic tank and the anoxic regulating tank. The inlet end of the anoxic regulating tank is connected to a municipal sewage pipe, and the bottom of the anoxic regulating tank is connected to the airlift device via a pipe. The airlift device includes a well, an air guide pipe, a microporous aerator, a water lift pipe, and an air pump. The microporous aerator is located at the bottom of the water lift pipe. One end of the air guide pipe is connected to the air pump, and the other end extends into the well and connects to the microporous aerator. One end of the water lift pipe extends into the bottom of the well, and the other end is bent, with its end serving as an outlet. The outlet corresponds to the top of the aerobic tank. A water outlet trough is installed on one side of the top of the aerobic tank, which is connected to a nitrification liquid return pipe and a water outlet pipe. The water outlet pipe is connected to the sedimentation tank, which has a water outlet at the top and a sludge discharge pipe at the bottom.

[0008] The aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device has an anoxic regulating tank equipped with elastic packing material, and the wastewater in the anoxic regulating tank flows in a plug flow state.

[0009] The above-mentioned energy-saving airlift multifunctional biological denitrification sewage treatment device has a first guide wall installed in the anoxic regulating tank. The first guide wall divides the anoxic tank into a spiral push flow channel, so that the sewage flows in a push flow state. A level gauge is installed at the top of the first guide wall. The level gauge is connected to the controller. The air pump is connected to the controller. The controller controls the opening and closing of the air pump according to the data of the level gauge.

[0010] The aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device has a sludge discharge pipe connected to a tee. One pipe of the tee returns the sludge to the anoxic regulating tank through a first gate valve and a sludge return pipe, while the other pipe of the tee discharges the sludge through a second gate valve.

[0011] In the aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device, the nitrification liquid return pipe and sludge return pipe are connected to the municipal sewage pipe via inspection wells on the municipal sewage pipe network.

[0012] The aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device has a combined packing material installed in the aerobic tank.

[0013] The above-mentioned energy-saving airlift multifunctional biological denitrification wastewater treatment device has a second guide wall in the aerobic tank, which divides the aerobic tank into spiral-shaped push flow channels, so that the wastewater flows in a push flow state.

[0014] The aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device has an adjustable air hole at the top of the horizontal section of the water outlet end of the water riser pipe.

[0015] In the aforementioned energy-saving airlift multifunctional biological denitrification wastewater treatment device, the regulating air hole is either one located at the center of the top of the horizontal section at the outlet end of the riser pipe, or two or more symmetrically arranged on both sides of the center of the top of the horizontal section at the outlet end of the riser pipe.

[0016] In the above-mentioned energy-saving airlift multifunctional biological denitrification sewage treatment device, the two regulating air holes are distributed within a 60° range at the top of the horizontal section at the end of the water riser, or multiple regulating air holes are evenly distributed within a 60° range at the top of the horizontal section at the end of the water riser. The diameter of the regulating holes is d, and the distance between two adjacent regulating holes is 5-8d.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] This invention adds an airlift device between the anoxic and aerobic tanks in a traditional A / O biological denitrification process to oxygenate the wastewater and raise its level, resulting in the highest level in the aerobic tank, followed by the sedimentation tank, and the lowest level in the anoxic equalization tank. This achieves: 1. Gravity return of nitrified liquor from the aerobic tank to the anoxic tank, eliminating the need for nitrification liquor return equipment; 2. Gravity return of excess sludge from the sedimentation tank to the anoxic tank, eliminating the need for sludge return equipment. It features low energy consumption, low operating costs, and simple operation and management, making it suitable for rural wastewater treatment; 3. Low manufacturing and maintenance costs.

[0019] This invention presents an energy-saving, multi-functional biological denitrification wastewater treatment device with airlift capability. Operation and management are simple, with the air pump's start and stop controlled by the liquid level in the regulating tank. It boasts a high degree of automation and requires no on-site professional operation. Maintenance costs are low, with only one energy-consuming device—an air pump. Based on an airlift device head of 0.5 meters and a nitrification liquid recirculation ratio of 300%, energy consumption is approximately 0.45 kWh / t, far lower than the energy consumption level of existing rural wastewater treatment facilities. The environmental, economic, and social benefits are significant. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a cross-sectional view of the horizontal section where the regulating vent of this invention is located. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the appendices of the embodiments of the present invention will be described below. Figure 1 and attached Figure 2 The technical solutions in the embodiments of the present invention will be clearly and completely described.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] like Figure 1 and Figure 2 The energy-saving airlift multifunctional biological denitrification wastewater treatment device shown includes an anoxic equalization tank 1, an aerobic tank 10, and a sedimentation tank 15, as well as an airlift device 5. The positions of the aerobic tank 10, sedimentation tank 15, and anoxic equalization tank 1 are sequentially lower. The airlift device 5 is installed between the aerobic tank 10 and the anoxic equalization tank 1. The inlet end of the anoxic equalization tank 1 is connected to a municipal sewage pipe, and the bottom of the anoxic equalization tank 1 is connected to the airlift device 5 through a pipe. The airlift device includes a well shaft 6, an air guide pipe 7, and a microporous aerator 8. The riser pipe 9 and the air pump are installed at the bottom of the riser pipe 9. One end of the air guide pipe is connected to the air pump, and the other end extends into the well and is connected to the microporous aerator. One end of the riser pipe 9 extends into the bottom of the well and the other end is bent, with its end being the outlet. The outlet corresponds to the top of the aerobic tank. A water outlet trough 12 is set on one side of the top of the aerobic tank. The water outlet trough is connected to the nitrification liquid return pipe 13 and the water outlet pipe 14 respectively. The water outlet pipe 14 is connected to the sedimentation tank. A water outlet is set at the top of the sedimentation tank and a sludge discharge pipe is set at the bottom.

[0027] In this invention, the well casing is sealed, with a riser pipe 9 extending into the lower part of the well casing, and the connection between the riser pipe and the well casing is sealed. An air guide pipe extends into the well casing, and the connection between the air guide pipe and the well casing is also sealed. The anoxic conditioning tank is connected to the well casing via a pipe, and the connection between the pipe and the well casing is sealed. The sealing treatment described above can be either applying waterproof adhesive or using a sealing ring.

[0028] The preferred structure of the energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention is that an elastic packing material 3 is installed in the anoxic regulating tank, and the wastewater in the anoxic regulating tank flows in a plug flow state.

[0029] The energy-saving airlift multifunctional biological denitrification wastewater treatment device of this invention has a preferred structure in which a first guide wall 2 is set in the anoxic regulating tank. The first guide wall divides the anoxic tank into a spiral-shaped push flow channel, causing the wastewater to flow in a push flow state. A level gauge is set at the top of the first guide wall, and the level gauge is connected to a controller. The air pump is also connected to the controller, and the controller controls the opening and closing of the air pump according to the data from the level gauge. The start and stop of the air pump are controlled by the liquid level in the anoxic regulating tank, resulting in a high degree of automation and eliminating the need for on-site operation by professional personnel. The operation and maintenance costs are low, and the energy-consuming equipment is only one air pump. Calculated based on the air pump head of the airlift device being 0.5 meters and the nitrification liquid return ratio being 300%, the energy consumption is approximately 0.45 kWh / t, which is far lower than the energy consumption level of existing rural wastewater treatment facilities. The environmental, economic, and social benefits are significant.

[0030] The preferred structure of the energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention is that the sludge discharge pipe is connected to a tee, one pipe of the tee is returned to the anoxic equalization tank 1 through the first gate valve 16 and the sludge return pipe 18, and the other pipe of the tee is discharged externally through the second gate valve 17.

[0031] The energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention has a preferred structure in which the nitrification liquid return pipe 13 and the sludge return pipe 18 are connected to the municipal sewage pipe through the inspection well on the municipal sewage pipe network.

[0032] The preferred structure of the energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention is that the aerobic tank 10 is equipped with a combined packing material 11.

[0033] The preferred structure of the energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention is that the aerobic tank 10 is provided with a second guide wall, which divides the aerobic tank into spiral push channels, so that the wastewater flows in a push flow state.

[0034] The preferred structure of the energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention is as follows: Figure 2 As shown, an adjusting air hole 19 is opened at the top of the horizontal section of the water outlet of the riser pipe. The setting of the adjusting air hole can expel the air in the riser pipe 9, thereby ensuring smooth drainage of the riser pipe.

[0035] The energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention has a preferred structure in which the regulating air hole is set at the center of the top of the horizontal section of the water outlet end of the riser pipe, or two or more are symmetrically arranged on both sides of the center of the top of the horizontal section of the water outlet end of the riser pipe.

[0036] The energy-saving airlift multifunctional biological denitrification wastewater treatment device of the present invention has a preferred structure in which two regulating air holes are distributed within a 60° range at the top of the horizontal section at the end of the water riser pipe, or multiple regulating air holes are evenly distributed within a 60° range at the top of the horizontal section at the end of the water riser pipe. The diameter of the regulating holes is d, and the distance between two adjacent regulating holes is 5-8d.

[0037] The working process of this invention is as follows: Sewage from the municipal sewage pipe enters the anoxic regulating tank 1, is filtered by the packing material in the anoxic regulating tank, and flows into the well cylinder 6 of the air lift device. The inlet cylinder is a sealed cylinder. The air pump is turned on and off according to the liquid level in the anoxic regulating tank. The sewage, containing air, continues to rise through the lift pipe into the aerobic tank 10 under the action of the air pump after passing through the micro-aeration hole aerator 8. After reacting in the aerobic tank, it flows into the effluent trough 12. The effluent trough is connected to the nitrification liquid return pipe 13 and the effluent pipe 14. The nitrification liquid in the effluent trough is returned to the anoxic regulating tank 1 through the nitrification liquid return pipe 13. The effluent pipe 14 is connected to the water distribution system of the sedimentation tank 15. The sludge discharge at the bottom of the sedimentation tank 15 is divided into two parts. One part is returned to the anoxic regulating tank 1 through the sludge return pipe 18 via the first gate valve 16, and the other part is the remaining sludge discharged through the second gate valve 17. The nitrification liquid return pipe 13 and the sludge return pipe 18 are connected to the municipal sewage pipe through the inspection well of the municipal sewage pipe network.

[0038] This invention adds an airlift device between the anoxic and aerobic tanks in a traditional A / O biological denitrification process. This device oxygenates the wastewater and raises the wastewater level, resulting in the highest level in the aerobic tank, followed by the sedimentation tank, and the lowest level in the anoxic equalization tank. This achieves: ① Gravity return of nitrified liquor from the aerobic tank to the anoxic tank, eliminating the need for nitrified liquor return equipment; ② Gravity return of excess sludge from the sedimentation tank to the anoxic tank, eliminating the need for sludge return equipment. It features low energy consumption, low operating costs, and simple operation and management, making it suitable for rural wastewater treatment. It also has low manufacturing and maintenance costs.

[0039] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. An energy-saving airlift multifunctional biological denitrification wastewater treatment device, comprising an anoxic equalization tank (1), an aerobic tank (10), and a sedimentation tank (15), characterized in that: It also includes an airlift device (5). The liquid levels of the aerobic tank (10), sedimentation tank (15), and anoxic regulating tank (1) decrease sequentially. An airlift device (5) is installed between the aerobic tank (10) and the anoxic regulating tank (1). The inlet end of the anoxic regulating tank (1) is connected to the municipal sewage pipe. The bottom of the anoxic regulating tank (1) is connected to the airlift device (5) through a pipe. The airlift device includes a well shaft (6), an air guide pipe (7), a microporous aerator (8), a water lift pipe (9), and an air pump. The microporous aerator is installed at the bottom of the water lift pipe (9). One end of the air pipe is connected to the air pump, and the other end extends into the well shaft and connects to the microporous aerator. One end of the riser pipe (9) extends into the bottom of the well shaft, and the other end is bent, with its end being the outlet. The outlet corresponds to the top of the aerobic tank. A water outlet trough (12) is set on one side of the top of the aerobic tank. The water outlet trough is connected to the nitrification liquid return pipe (13) and the water outlet pipe (14) respectively. The water outlet pipe (14) is connected to the sedimentation tank. A water outlet is set at the top of the sedimentation tank, and a sludge discharge pipe is set at the bottom. The anoxic regulating tank is equipped with elastic packing material (3). The sewage in the anoxic regulating tank is in the form of... The wastewater flows in a plug flow state; a first guide wall (2) is set in the anoxic regulating tank, which divides the anoxic tank into a spiral plug flow channel, so that the wastewater flows in a plug flow state. A level gauge is set at the top of the first guide wall, which is connected to the controller. An air pump is connected to the controller, and the controller controls the opening and closing of the air pump according to the data of the level gauge. The sludge discharge pipe is connected to a tee. One pipe of the tee is returned to the anoxic regulating tank (1) through the first gate valve (16) and the sludge return pipe (18). The other pipe of the tee is connected to the second gate valve (18). 17) External discharge; An adjusting air hole (19) is opened at the top of the horizontal section of the water outlet end of the water riser pipe; the adjusting air hole is one located at the center of the top of the horizontal section of the water outlet end of the water riser pipe, or two or more are symmetrically arranged on both sides of the center of the top of the horizontal section of the water outlet end of the water riser pipe; the two adjusting air holes are distributed within a 60° range at the top of the horizontal section at the end of the water riser pipe, or multiple adjusting air holes are evenly distributed within a 60° range at the top of the horizontal section at the end of the water riser pipe, the diameter of the adjusting hole is d, and the distance between two adjacent adjusting holes is 5-8d.

2. The energy-saving airlift multifunctional biological denitrification wastewater treatment device according to claim 1, characterized in that: The nitrification liquid return pipe (13) and the sludge return pipe (18) are connected to the municipal sewage pipe through inspection wells on the municipal sewage pipe network.

3. The energy-saving airlift multifunctional biological denitrification wastewater treatment device according to claim 2, characterized in that: The aerobic tank (10) is equipped with combined packing material (11).

4. The energy-saving airlift multifunctional biological denitrification wastewater treatment device according to claim 3, characterized in that: The aerobic tank (10) is equipped with a second guide wall, which divides the aerobic tank into a spiral push flow channel, so that the sewage flows in a push flow state.

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