AAO Wastewater Treatment System

Abstract

The utility model discloses an AAO sewage treatment system, including an anaerobic tank, an anoxic tank and an aerobic tank connected in sequence, wherein the anaerobic tank is provided with a first spiral jet stirring tube and / or the anoxic tank is provided with a second spiral jet stirring tube, the first spiral jet stirring tube is connected to the anoxic tank via a first return pipe, and the second spiral jet stirring tube is connected to the aerobic tank via a second return pipe. The utility model eliminates the traditional submersible mixers or perforated aeration pipes (or aeration plates) of the anaerobic tank and the anoxic tank by providing spiral jet stirring tubes in the anaerobic tank and / or the anoxic tank and connecting them to the nitrification liquid return pump and the anoxic to anaerobic return pump of the AAO process, reduces the submersible mixers and blowers, reduces the equipment cost, reduces the power consumption of the power source operation, saves the operating cost, and at the same time reduces the operation and maintenance costs of the submersible mixer or blower.

Description

Technical Field

[0001] The utility model relates to the field of environmental protection equipment, in particular to an AAO sewage treatment system. Background Art

[0002] AAO process is a commonly used process for wastewater treatment.

[0003] As shown in the patent with authorization announcement number CN207699295U and application publication number CN108059239A, in order to fully mix the anaerobic and anoxic activated sludge with the wastewater and prevent the activated sludge from sinking, the commonly used stirring method is to set up a submersible mixer for stirring or to supply air to the perforated aeration pipe (or aeration plate) through a blower for stirring.

[0004] In this structure, in addition to installing a submersible mixer or perforated aeration pipe and blower, a sludge return pump, a nitrification liquid return pump, and a return pump from the anoxic tank to the anaerobic tank must also be installed to ensure the normal operation of the process. This results in the inability to fully utilize the return pumps that must be used in the system. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems existing in the prior art and to provide an AAO sewage treatment system.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] The AAO sewage treatment system comprises an anaerobic tank, an anoxic tank and an aerobic tank which are connected in sequence, wherein the anaerobic tank is provided with a first spiral jet stirring tube and / or the anoxic tank is provided with a second spiral jet stirring tube, the first spiral jet stirring tube is connected to the anoxic tank via a first return pipe, and the second spiral jet stirring tube is connected to the aerobic tank via a second return pipe.

[0008] Preferably, in the AAO sewage treatment system, the first spiral jet stirring tube and / or the second spiral jet stirring tube includes a vertical pipe section and a stirring section connected to the lower end of the vertical pipe section and distributed in the form of an Archimedean spiral.

[0009] Preferably, in the AAO sewage treatment system, the first spiral jet stirring tube and / or the second spiral jet stirring tube comprises a vertical pipe section and a stirring section connected to the lower end of the vertical pipe section and laid flat in a spiral square shape.

[0010] Preferably, in the AAO sewage treatment system, the first spiral jet stirring tube and / or the second spiral jet stirring tube is a conical spiral tube.

[0011] Preferably, in the AAO sewage treatment system, a water spray hole for spraying water toward the side is formed on the first spiral jet stirring tube and / or the second spiral jet stirring tube.

[0012] Preferably, in the AAO sewage treatment system, the water spray hole is located on the side of the first spiral jet stirring tube and / or the second spiral jet stirring tube close to the spiral center.

[0013] Preferably, in the AAO sewage treatment system, on the stirring section of the first spiral jet stirring tube and / or the second spiral jet stirring tube, the aperture of the water spray holes in the area closer to the water inlet is smaller and the hole density is larger, and the aperture of the water spray holes in the area farther away from the water inlet is larger and the hole density is smaller.

[0014] Preferably, in the AAO sewage treatment system, the aerobic tank is connected to the secondary sedimentation tank.

[0015] The advantages of the technical solution of the utility model are mainly reflected in:

[0016] The utility model eliminates the traditional submersible mixers or perforated aeration pipes (or aeration plates) of the anaerobic tank 100 and the anoxic tank 200 by arranging spiral jet stirring pipes in the anaerobic tank 100 and / or the anoxic tank 200 and connecting them to the nitrification liquid reflux pump and the anoxic to anaerobic reflux pump of the AAO process, thereby reducing the submersible mixers and blowers, lowering the equipment cost, reducing the power consumption of the power source operation, saving the operating cost, and at the same time reducing the operation and maintenance costs of the submersible mixers or blowers.

[0017] The layout of the stirring section of the utility model can effectively cover the anaerobic tank and the anoxic tank, thereby fully ensuring the adequacy of stirring in each area.

[0018] The utility model can effectively reduce the interference between water sprays by designing the water spray holes, and at the same time effectively ensure the stirring effects in different areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top view of the AAO sewage treatment system of the utility model;

[0020] Figure 2 This is the front view of the AAO sewage treatment system of the utility model;

[0021] Figure 3 It is a schematic diagram of the stirring section of the utility model being in the shape of an Archimedean spiral;

[0022] Figure 4 It is a schematic diagram showing that the stirring section of the utility model is a spiral square. DETAILED DESCRIPTION

[0023] The purpose, advantages and features of the present invention will be illustrated and explained through the non-limiting description of the following preferred embodiments. These embodiments are only typical examples of the application of the technical solution of the present invention, and any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection claimed by the present invention.

[0024] In the description of the scheme, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] The AAO sewage treatment system disclosed by the utility model is described below in conjunction with the accompanying drawings. Figure 1 , Attachment Figure 2 As shown, it includes an anaerobic tank 100, an anoxic tank 200, an aerobic tank 300 and a secondary sedimentation tank 400 which are connected in sequence. The specific structures of the anaerobic tank 100, the anoxic tank 200, the aerobic tank 300 and the secondary sedimentation tank 400 are known technologies and will not be described in detail here.

[0026] Different from the prior art:

[0027] As attached Figure 1 , Attachment Figure 2 As shown, the utility model is provided with a first spiral jet stirring tube 500 in the anaerobic tank 100 and / or a second spiral jet stirring tube 600 in the anoxic tank 200, the first spiral jet stirring tube 500 is connected to the anoxic tank 200 through a first return pipe 700, and the second spiral jet stirring tube 600 is connected to the aerobic tank 300 through a second return pipe 800.

[0028] During operation, the reflux liquid of the anoxic tank 200 is ejected from the first spiral jet stirring tube 500 through the first reflux pipe 700, forming a jet force to fully mix and stir the activated sludge and wastewater in the anaerobic tank 100, while preventing the anaerobic activated sludge from sinking.

[0029] At the same time, the nitrification liquid of the aerobic tank 300 (the mixed liquid at the end of the aerobic tank 300) flows back to the second spiral jet stirring tube 600 through the second reflux pipe 800 and is ejected out, forming a jet force to fully mix and stir the activated sludge and wastewater in the anoxic tank 200, while preventing the anoxic activated sludge from sinking.

[0030] The structures of the first spiral jet stirring tube 500 and the second spiral jet stirring tube 600 may be the same or different. It is preferred that they are configured to have the same structure, and the first spiral jet stirring tube 500 is taken as an example for description.

[0031] The first spiral jet stirring tube 500 can have various structures, such as Figure 2 , Attachment Figure 3 As shown, in one structure, the first spiral jet stirring pipe 500 includes a vertical pipe section 510 and a stirring section 520 connected to the lower end of the vertical pipe section 510 and distributed in the form of an Archimedean spiral. The vertical pipe section 510 extends to the top of the anaerobic tank 100 and is connected to the first return pipe.

[0032] In another structure, such as Figure 1 , Attachment Figure 2 As shown, the first spiral jet stirring tube 500 also includes a vertical tube section 510. Different from the above structure, the stirring section 520 connected to the lower end of the vertical tube section 510 is not in the form of an Archimedean spiral, but in the form of a spiral square flattened.

[0033] Of course, in another embodiment, the first spiral jet stirring tube 500 is a conical spiral tube, and the proximal end of the conical spiral tube is arranged upward.

[0034] The first spiral jet stirring tube 500 and / or the second spiral jet stirring tube 600 are provided with water spray holes. Preferably, a water spray hole for spraying water toward the side is formed on the stirring section 520 .

[0035] In order to ensure the stirring effect, reduce the mutual interference between the water spray holes, such as the attached Figure 4 As shown, the water spray hole is located on the side of the first spiral jet stirring tube 500 and / or the second spiral jet stirring tube 600 close to the spiral center.

[0036] Furthermore, in order to ensure the stirring effect in different areas, on the stirring section 520 of the first spiral jet stirring tube 500 and / or the second spiral jet stirring tube 600, the aperture of the water spray holes in the area closer to the water inlet is smaller and the hole density is larger, and the aperture of the water spray holes in the area farther from the water inlet is larger and the hole density is smaller.

[0037] The specific structures of the first reflux pipe 700 and the second reflux pipe 800 are known technologies. The first reflux pipe 700 pumps the liquid in the anoxic pool 200 to the first spiral jet stirring pipe 500 through a first reflux pump, and the second reflux pipe 800 pumps the nitrification liquid in the aerobic pool 300 to the second spiral jet stirring pipe 600 through a second reflux pump.

[0038] There are many implementation methods of the utility model, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the utility model.

Claims

1. AAO sewage treatment system, including anaerobic tank, anoxic tank and aerobic tank connected in sequence, characterized in that: The anaerobic tank is provided with a first spiral jet stirring tube and / or the anoxic tank is provided with a second spiral jet stirring tube, the first spiral jet stirring tube is connected to the anoxic tank through a first return pipe, and the second spiral jet stirring tube is connected to the aerobic tank through a second return pipe.

2. The AAO sewage treatment system according to claim 1, characterized in that: The first spiral jet stirring tube and / or the second spiral jet stirring tube comprises a vertical tube section and a stirring section connected to the lower end of the vertical tube section and distributed in the form of an Archimedean spiral.

3. The AAO sewage treatment system according to claim 1, characterized in that: The first spiral jet stirring tube and / or the second spiral jet stirring tube comprises a vertical pipe section and a stirring section connected to the lower end of the vertical pipe section and laid flat in a spiral square shape.

4. The AAO sewage treatment system according to claim 1, characterized in that: The first spiral jet stirring tube and / or the second spiral jet stirring tube are conical spiral tubes.

5. The AAO sewage treatment system according to claim 1, characterized in that: The first spiral jet stirring tube and / or the second spiral jet stirring tube are formed with water spray holes for spraying water toward the side.

6. The AAO sewage treatment system according to claim 5, characterized in that: The water spray hole is located on a side of the first spiral jet stirring tube and / or the second spiral jet stirring tube close to the spiral center.

7. The AAO sewage treatment system according to claim 5, characterized in that: On the stirring section of the first spiral jet stirring tube and / or the second spiral jet stirring tube, the water spray holes in the area closer to the water inlet have smaller apertures and greater hole density, while the water spray holes in the area farther from the water inlet have larger apertures and smaller hole density.

8. The AAO sewage treatment system according to any one of claims 1 to 7, characterized in that: The aerobic tank is connected to the secondary sedimentation tank.

Images