A method and apparatus for the unpowered aerobic treatment of nitrification liquor

Abstract

The application relates to a kind of nitration liquid unpowered oxygen escape method and device, the application adopts the structure of deflection water inlet, dissolved oxygen is fully released in the slow rising process of nitration liquid in the first oxygen escape zone, further reduces the dissolved oxygen of anoxic gas; The setting of middle pipe ensures that nitration liquid will not form water flow gradient in the process from the first oxygen escape zone to the second oxygen escape zone, to avoid air entering the nitration reflux liquid; Nitration liquid enters the third oxygen escape zone through the flow guide opening at the bottom of the second oxygen escape zone, the contact surface of nitration liquid and water inlet is large, in this section, denitrifying bacteria form dominant species, fully utilize the organic carbon of water inlet to carry out denitrification. The application has the advantages of fast oxygen escape speed, simple structure, convenient operation and management, small land occupation area and low investment cost. The application is easy to implement and has good use effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a method and device for unpowered oxygen escape of nitrification liquid. BACKGROUND

[0002] In recent years, ecological environment governance has become an important issue of global concern, and the operation of sewage plants is closely related to local energy saving and emission reduction. Some sewage treatment plants were built early, with low effluent standards at the time of construction, and the construction site was very valuable. With the increasing supervision of environmental protection departments on sewage plants, sewage plant upgrading is imperative. In order to meet the new discharge standard, huge investment is needed for upgrading and reconstruction. In the case of valuable land, land acquisition and demolition for plant expansion require large capital investment, long construction period, and increased operating costs.

[0003] With a device, the effluent quality can be quickly improved with a small amount of capital investment, without increasing or slightly increasing operating costs, which is an important development direction for the reconstruction of old sewage treatment plants. SUMMARY

[0004] The purpose of the present application is to provide a method and device for unpowered oxygen escape of nitrification liquid, which has the advantages of fast oxygen escape speed, simple structure, convenient operation and management, reduced operating costs, reduced carbon source addition, and small land occupation and investment cost.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] The method for unpowered oxygen escape of nitrification liquid is that the reflux pump introduces the nitrification liquid from the nitrification liquid reflux pipe into the nitrification liquid reflux area of the inner pipe 1, the nitrification liquid enters the primary oxygen escape area through the flow guide port at the bottom of the inner pipe under the action of gravity, the air molecules in the nitrification liquid rise at a faster speed than the nitrification liquid under the action of liquid level pressure difference, part of the air molecules in the nitrification liquid escape from the nitrification liquid, and the first nitrification liquid dissolved oxygen release is realized; the nitrification liquid enters the secondary oxygen escape area through the top of the middle pipe at the end of the primary oxygen escape area, the descending speed of the nitrification liquid in the secondary oxygen escape area is less than the ascending speed in the primary oxygen escape area, so that the air molecule buoyancy in the nitrification liquid is greater than the downward thrust received by the air molecule, the air molecule escapes again in the secondary oxygen escape, and the second nitrification liquid dissolved oxygen release is realized.

[0007] The invention discloses an unpowered oxygen escape device for nitrifying liquid, comprising an inner tube, a middle tube and an outer tube. The inner tube is a cylindrical structure with an open bottom. A nitrifying liquid reflux pipe is provided at the top of the inner tube, the nitrifying liquid reflux pipe is connected to the interior of the inner tube, and the interior of the inner tube forms a nitrifying liquid reflux zone. The middle tube is a cylindrical structure with an open top. The inner tube is located inside the middle tube. A guide port is provided at the bottom of the inner tube, the guide port connects the interior of the inner tube and the interior of the middle tube, and the area between the outer wall of the inner tube and the inner wall of the middle tube forms a primary oxygen escape zone. The outer tube is a cylindrical structure with closed ends. A nitrifying liquid outlet is provided at the bottom of the side wall. The middle tube is located inside the outer tube, and the top of the middle tube is connected to the interior of the outer tube. The area between the outer wall of the middle tube and the inner wall of the outer tube forms a secondary oxygen escape zone.

[0008] A guide plate is provided at the bottom of the side wall of the middle tube.

[0009] Compared with the prior art, the present invention has the following beneficial effects: the present invention adopts a structure of baffled water inlet, and the dissolved oxygen is fully released during the slow rise of the nitrifying liquid in the primary oxygen escape zone, further reducing the dissolved oxygen caused by anoxic conditions; the setting of the middle pipe ensures that no water flow gradient is formed during the process of the nitrifying liquid moving from the primary oxygen escape zone to the secondary oxygen escape zone, thus preventing air from entering the nitrifying reflux liquid; the nitrifying liquid enters the tertiary oxygen escape zone through the bottom diversion port of the secondary oxygen escape zone, and the contact surface between the nitrifying liquid and the inlet water is large. In this section, denitrifying bacteria form a dominant species, making full use of the organic carbon in the inlet water to carry out denitrification. The present invention has a fast oxygen escape speed, a simple structure, convenient operation and management, a small footprint, and a low investment cost. The present invention is easy to implement and has a good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Attachment Figure 1 A schematic structural diagram of the present invention

[0011] Attachment Figure 2 For attachment Figure 1 Schematic diagram of the cross-section structure. DETAILED DESCRIPTION

[0012] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0014] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0015] As Figures 1-2 shown, the nitration liquid unpowered escape oxygen device includes an inner tube 1, a middle tube 2 and an outer tube 3. The inner tube 1 is a cylindrical structure with an open bottom. A nitration liquid return pipe 4 is arranged at the top of the inner tube 1 and communicates with the inside of the inner tube 1. The inside of the inner tube 1 forms a nitration liquid return area 5. The middle tube 2 is a cylindrical structure with an open top. The inner tube 1 is located in the middle tube 2. A flow guide 9 is arranged at the bottom of the inner tube 1 and communicates the inside of the inner tube 1 with the inside of the middle tube 2. The area between the outer wall of the inner tube 1 and the inner wall of the middle tube 2 forms a first-stage escape oxygen area 6. The outer tube 3 is a cylindrical structure with both ends closed. A nitration liquid outlet 8 is arranged at the bottom of the side wall. The middle tube 2 is located in the outer tube 3, and the top of the middle tube 2 communicates with the inside of the outer tube 3. The area between the outer wall of the middle tube 2 and the inner wall of the outer tube 3 forms a second-stage escape oxygen area 7. A flow guide plate 10 is arranged at the bottom of the side wall of the middle tube 2.

[0016] The use process of the embodiment is as follows:

[0017] 1. The reflux pump lifts the nitration liquid from the nitration liquid return pipe 4 into the nitration liquid return area 5 of the inner tube 1. The nitration liquid enters the first-stage escape oxygen area 6 through the flow guide 3 under the action of gravity. The nitration liquid slowly rises under the action of liquid level pressure difference. The air molecules in the nitration liquid are lighter than the nitration liquid and rise faster, and escape from the nitration liquid, realizing the first release of dissolved oxygen in the nitration liquid.

[0018] The nitration liquid enters the secondary oxygen escaping zone 7 through the top of the middle tube 2 at the end of the primary oxygen escaping zone 6. Since the surface area to volume ratio of the secondary oxygen escaping zone is larger than that of the primary oxygen escaping zone, the descending speed of the nitration liquid is obviously smaller than the ascending speed in the primary oxygen escaping zone. The air molecules in the nitration liquid have a larger floating force than the downward thrust received by the air molecules, the air molecules escape again in the secondary oxygen escaping zone, thereby realizing the second release of dissolved oxygen in the nitration liquid.

[0019] In the embodiment, the device can be made of carbon steel, stainless steel, polymer material, glass steel, brick and concrete, etc.

[0020] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A method for unpowered oxygen escape of nitrifying liquid, characterized in that: The reflux pump guides the nitrification liquid from the nitrification liquid reflux pipe (4) into the nitrification liquid reflux zone (5) of the inner tube 1. The nitrification liquid enters the primary oxygen escape zone (6) through the guide port (9) at the bottom of the inner tube under the action of gravity. Under the action of the liquid level pressure difference, the density of the air molecules in the nitrification liquid increases at a faster speed than the nitrification liquid, so that some of the air molecules in the nitrification liquid escape from the nitrification liquid, thereby achieving the first release of dissolved oxygen in the nitrification liquid; the nitrification liquid enters the secondary oxygen escape zone (7) through the top of the middle tube (2) arranged at the end of the primary oxygen escape zone (6), so that the descending speed of the nitrification liquid in the secondary oxygen escape zone (7) is less than the ascending speed in the primary oxygen escape zone, so that the buoyancy of the air molecules in the nitrification liquid is greater than the downward thrust received by the air molecules, and the air molecules escape again in the secondary oxygen escape, thereby achieving the second release of dissolved oxygen in the nitrification liquid.

2. A non-powered oxygen escape device for nitrifying liquid for implementing the method according to claim 1, comprising an inner tube (1), a middle tube (2) and an outer tube (3), characterized in that: The inner tube (1) is a cylindrical structure with an open bottom. A nitrifying liquid reflux pipe (4) is provided at the top of the inner tube (1). The nitrifying liquid reflux pipe (4) is connected to the interior of the inner tube (1). The interior of the inner tube (1) forms a nitrifying liquid reflux zone (5). The middle tube (2) is a cylindrical structure with an open top. The inner tube (1) is located inside the middle tube (2). A diversion port (9) is provided at the bottom of the inner tube (1). The diversion port (9) connects the inner tube (1) with the interior of the middle tube (2). The area between the outer wall of the inner tube (1) and the inner wall of the middle tube (2) forms a primary oxygen escape zone (6). The outer tube (3) is a cylindrical structure with closed ends. A nitrifying liquid outlet (8) is provided at the bottom of the side wall. The middle tube (2) is located inside the outer tube (3). The top of the middle tube (2) is connected to the interior of the outer tube (3). The area between the outer wall of the middle tube (2) and the inner wall of the outer tube (3) forms a secondary oxygen escape zone (7).

3. The unpowered oxygen escape device for nitrifying liquid according to claim 2, characterized in that: A guide plate (10) is provided at the bottom of the side wall of the middle tube (2).

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