Improved aeration or a / a / o wastewater treatment device based on micro-porous hose aeration

Abstract

The utility model provides a kind of based on micro-porous hose aeration's improved AO or AAO sewage treatment device, it is related to sewage treatment technical field, comprising: the anoxic tank of aeration and stirring function, there is sewage inlet and micro-porous aeration hose in pool;Aerobic tank with aeration and stripping function, there is intercommunicating hole in pool, micro-porous aeration hose, DO sensor and stripping device, and the water outlet of stripping device is provided with in same side.The utility model not only can reduce overall energy consumption, can also promote total nitrogen removal rate to >85%.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a modified AO or AAO wastewater treatment device based on microporous flexible tube aeration. Background Technology

[0002] The AO (Anoxic-Aerobic) process, or AAO (Anoxic-Anoxic-Aerobic) process, is a multi-stage biological nitrogen removal process, typically consisting of an anoxic tank (A tank) and an aerobic tank (O tank) connected in series. It is primarily used to remove organic matter (COD / BOD) and nitrogenous pollutants (NH4) from wastewater. + NO3 - Its core principle is to achieve nitrogen removal through the synergistic effect of anoxic denitrification and aerobic nitrification.

[0003] However, existing AO processes suffer from common drawbacks. The A tank (anoxic tank) traditionally uses mechanical stirring, which is energy-intensive and cannot achieve precise control of trace oxygen levels, limiting its application in short-cut nitrification. The O tank (aerobic tank), on the other hand, typically uses rigid aerators (disc / tube type), which easily leads to rapid decline in oxygen transfer efficiency and poor uniformity of air distribution. Due to these shortcomings, aeration energy consumption accounts for more than 50% of the total plant energy consumption. Furthermore, the lack of system synergy and independent control of the A / O tanks further limits denitrification efficiency (typically <75%) and carbon source utilization. Utility Model Content

[0004] To reduce the mixing energy consumption in the A tank (anoxic tank), improve the oxygen transfer efficiency in the O tank (aerobic tank), and precisely control dissolved oxygen, this invention provides a modified AO or AAO wastewater treatment device based on microporous flexible tubing aeration, comprising: The first anoxic tank has aeration and stirring functions; the first anoxic tank has a sewage inlet and microporous aeration hoses are evenly distributed perpendicular to the sewage inlet direction. An aerobic tank with aeration and airlift functions; the aerobic tank has a wastewater inlet and a first connecting hole (for wastewater to enter the aerobic tank) that connects to the first anoxic tank; microporous aeration hoses are evenly distributed at intervals in the direction parallel to the inlet of the connecting hole; a DO sensor (i.e., oxygen content) is also included, which is connected to a blower; an airlift device is located diagonally opposite the first connecting hole, and an airlift partition wall is set around the airlift device. On the side of the airlift partition wall closest to the first connecting hole, a section of guide wall that does not contact the tank wall is also set along the direction of wastewater flow; an outlet is set on the same side as the airlift device (obviously, "same side" here means parallel to the direction of water flow).

[0005] Preferably, it also has a second anoxic tank connected to the first anoxic tank and having aeration and stirring functions. The second anoxic tank has a sewage inlet and microporous aeration hoses evenly distributed at intervals. There is also a second connecting hole between the first anoxic tank and the second anoxic tank.

[0006] Preferably, the first connecting hole and the second connecting hole are arranged diagonally on the second anoxic pool.

[0007] Preferably, the microporous aeration hoses are arranged in groups, with the arrangement spacing of each group in the first or second A pool being 2-5m and the arrangement spacing of each group in the O pool being 0.8-2m, and each group containing several microporous aeration hoses.

[0008] Preferably, aeration is performed intermittently in pool A.

[0009] Preferably, the air volume of the fan in the O-cell is controlled by frequency conversion.

[0010] Preferably, the air-lift device in the O-pool uses compressed air generated by a blower as its power source, and aerates the water through a uniform air distribution system. The fine, dense air bubbles alter the local water density, creating a density difference that accelerates water flow. Simultaneously, the increased water volume, guided by the outlet structure, raises the liquid level in the aerated zone. The level difference between the aerated and non-aerated zones propels the water flow, achieving high-flow-rate water transport and realizing a high-rate internal circulation.

[0011] Preferably, the outlet is also connected to the secondary sedimentation tank, and the sludge in the secondary sedimentation tank is returned to the A tank (when it is an AAO structure, it is returned to the second A tank).

[0012] Wastewater inlets are set in the first A tank and the second A tank. The inflow rate is related to the aeration area. The calculation method is: inflow rate of the first or second A tank = total inflow rate × (aeration area of ​​the first or second A tank / total aeration area).

[0013] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: This invention eliminates mechanical agitation by using microporous aeration hoses, achieving both agitation and micro-oxygen regulation, thus effectively saving energy and reducing consumption. Furthermore, the use of microporous aeration hoses improves oxygen transfer efficiency in the O-cell tank; additionally, through sensor-fan linkage, dissolved oxygen is precisely controlled, and A / O synergistic control enhances total nitrogen removal to >85%. The airlift device further increases internal circulation within the O-cell tank, and combined with multi-point water distribution to optimize carbon source allocation, reduces reagent costs while improving effluent stability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the entire AO wastewater treatment device of this utility model; Figure 2 This is a structural diagram of the AO wastewater treatment device of this utility model; wherein Figure 2 (a) is the plane of the device. Figure 2 (b) is an elevation view of the device; Figure 3 This is a schematic diagram of the entire AAO wastewater treatment device of this utility model; Figure 4 This is a structural diagram of the AAO wastewater treatment device of this utility model; wherein Figure 4 (a) is the plane of the device. Figure 4 (b) is an elevation view of the device; Among them, 1-microporous aeration hose; 2-airlift partition wall; 3-airlift device; 4-first connecting hole; 5-guide wall; 6-second connecting hole. Detailed Implementation

[0016] The technical solution of this utility model will now be described with reference to the accompanying drawings.

[0017] In the embodiments of this utility model, words such as "exemplarily" and "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" in this utility model should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the word "exemplary" is intended to present the concept in a concrete manner. Furthermore, in the embodiments of this utility model, the meaning expressed by "and / or" can be both, or it can be either one or the other.

[0018] In this embodiment of the utility model, the terms "image" and "picture" may sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, their intended meanings are consistent. Similarly, the terms "of," "corresponding," and "corresponding" may sometimes be used interchangeably. It should be noted that when the distinction is not emphasized, their intended meanings are consistent.

[0019] In this embodiment of the utility model, sometimes the subscript such as W1 may be mistakenly written as a non-subscript form such as W1. When the difference is not emphasized, the meaning they express is the same.

[0020] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1-2 As shown, the improved AO wastewater treatment device based on microporous flexible hose aeration of this utility model includes an A tank (anoxic tank) and an O tank (aerobic tank). Wastewater enters the treatment device from the A tank and the O tank respectively. The A tank uses microporous aeration hoses 1 arranged at intervals with a group spacing of 2-5m, and intermittent operation ensures the fluidization function of the A tank. At the same time, a connecting hole 4 is provided between the A tank and the O tank. The connecting hole 4 is located on the side away from the guide wall 5, and the wastewater treated in the A tank also enters the O tank through the connecting hole.

[0022] Aeration in the O-tank utilizes microporous aeration hoses 1, evenly distributed within the tank with a spacing of 0.8-2m between hoses. A DO sensor is also installed, linking the DO value (oxygen content) to the blower, which controls the airflow via frequency conversion. The tank also features an air-lift device 3, surrounded by an air-lift partition wall 2. Air lifting uses compressed air generated by a blower as a power source, aerating the water through a uniform air distribution system. These small, dense air bubbles alter the local water density, creating a density difference that accelerates water flow. The level difference between the aerated and non-aerated zones propels the water flow, achieving high-flow-rate water transport and high-rate circulation within the O-tank. The effluent from the O-tank flows into and out of the secondary sedimentation tank, with the outlet located near the air-lift device. The secondary sedimentation tank is a traditional type, with sludge returned to the A-tank. Figure 2 (a) The arrows indicate the direction of water flow. Figure 2 (b) The arrow indicates that the water flow in the O pool is internally circulated by air lifting.

[0023] like Figure 3-4 As shown, the improved AAO wastewater treatment device based on microporous flexible hose aeration of this utility model includes first and second A tanks (anoxic tanks) and an O tank (aerobic tank). The first and second A tanks are arranged with microporous aeration hoses 1 at intervals, with a group spacing of 2-5m, and intermittent operation ensures the fluidization function of the A tanks. A second connecting hole 6 is provided between the first and second A tanks, and a first connecting hole 4 is provided between the first A tank and the O tank. The first connecting hole 4 is located on the side away from the guide wall 5.

[0024] Aeration in the O-tank utilizes microporous aeration hoses 1, evenly distributed within the tank with a spacing of 0.8-2m between hoses. A DO sensor is also installed, linking the DO value (oxygen content) to the blower, which controls the airflow via frequency conversion. The tank also features an air-lift device 3, surrounded by an air-lift partition wall 2. Air lifting uses compressed air generated by a blower as a power source, aerating the water through a uniform air distribution system. These small, dense air bubbles alter the local water density, creating a density difference that accelerates water flow. The level difference between the aerated and non-aerated zones propels the water flow, achieving high-flow-rate water transport and high-rate circulation within the O-tank. The effluent from the O-tank flows into and out of the secondary sedimentation tank, with the outlet located near the air-lift device. The secondary sedimentation tank is a traditional type, with sludge returned to the second A-tank. Figure 4 (a) The arrows indicate the direction of water flow. Figure 4 (b) The arrow indicates that the water flow in the O pool is internally circulated by air lifting.

[0025] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A modified AO or AAO wastewater treatment device based on microporous flexible tube aeration, characterized in that, include: The first anoxic tank with aeration and mixing functions; The first anoxic tank has a sewage inlet and microporous aeration hoses are evenly distributed perpendicular to the sewage inlet direction. An aerobic tank with aeration and airlift functions; the aerobic tank has a sewage inlet and a first connecting hole that connects to the first anoxic tank; microporous aeration hoses are evenly distributed at intervals in the direction parallel to the water inlet of the connecting hole; a DO sensor is also included, which is connected to a blower; an airlift device is located diagonally opposite to the first connecting hole, and an airlift partition wall is provided around the airlift device. On the side of the airlift partition wall closest to the first connecting hole, a section of guide wall that does not contact the tank wall is also provided along the sewage flow direction; an outlet is provided on the same side of the airlift device.

2. The apparatus according to claim 1, characterized in that, It also has a second anoxic tank connected to the first anoxic tank and has aeration and stirring functions. The second anoxic tank has a sewage inlet and microporous aeration hoses evenly distributed at intervals. There is also a second connecting hole between the first anoxic tank and the second anoxic tank.

3. The apparatus according to claim 2, characterized in that, The first and second connecting holes are arranged diagonally on the second anoxic pool.

4. The apparatus according to claim 2, characterized in that, The microporous aeration hoses are arranged in groups. The spacing between each group in the first and second anoxic tanks is 2-5m, and the spacing between each group in the aerobic tank is 0.8-2m. Each group contains several microporous aeration hoses.

5. The apparatus according to claim 2, characterized in that, The first and second anoxic tanks are aerated intermittently.

6. The apparatus according to claim 1, characterized in that, The air volume of the blower in the aerobic tank is controlled by frequency conversion.

7. The apparatus according to claim 1, characterized in that, The outlet is also connected to the secondary sedimentation tank, and the sludge in the secondary sedimentation tank is returned to the anoxic tank.

8. The apparatus according to claim 1, characterized in that, Wastewater inlets are set in the first and second anoxic tanks. The inflow rate is related to the aeration area. The calculation method is: inflow rate of the first or second anoxic tank = total inflow rate × (aeration area of ​​the first or second anoxic tank / total aeration area).

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