Denitrification-nitrification sewage treatment device

Abstract

The utility model provides a denitrification-nitrification sewage treatment device, and belongs to the technical field of sewage treatment. The denitrification-nitrification sewage treatment device comprises an anoxic tank and an aerobic tank, a pore plate is transversely arranged in the anoxic tank, a tank body of the anoxic tank is divided into a tank body upper section and a tank body lower section by the pore plate, the tank body upper section is positioned above the pore plate, and the tank body lower section is positioned below the pore plate; the aperture of a through hole of the pore plate is smaller than the size of a carrier in the anoxic tank, the pore plate is located below the height center of the anoxic tank, and an anoxic treatment water inlet and an anoxic treatment water outlet of the anoxic tank are both formed in the lower section of the tank body; an aeration device is arranged in the aerobic tank, and an aerobic treatment water inlet of the aerobic tank is communicated with the anoxic treatment water outlet. The denitrification-nitrification sewage treatment device can solve the problems of difficult fluidization and easy local accumulation of the carrier in the anoxic tank, and can reduce the damage to the carrier compared with a mechanical stirring mode.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a denitrification-nitrification sewage treatment device. Background Art

[0002] The denitrification-nitrification process is a common wastewater treatment process. Wastewater is first denitrified in an anoxic tank, followed by nitrification in an aerobic tank. During the wastewater treatment process, a carrier is often added to assist. In traditional processes, especially in anoxic tanks, carrier fluidization is difficult, leading to localized accumulation of carrier, thus compromising treatment effectiveness.

[0003] In some processes, mechanical stirring of the carrier is performed by adding a stirring device to improve the problems of difficult fluidization of the carrier and easy local accumulation. However, mechanical stirring may damage the carrier and cause the carrier to break, especially for fragile hollow structure carriers, which will affect the treatment effect and increase the carrier cost. Utility Model Content

[0004] The purpose of this application is to provide a denitrification-nitrification sewage treatment device, which can improve the problems of difficult fluidization and easy local accumulation of carriers in the anoxic tank, and can also reduce damage to the carrier compared with the mechanical stirring method.

[0005] The embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a denitrification-nitrification sewage treatment device, comprising an anoxic tank and an aerobic tank; an orifice plate is horizontally provided in the anoxic tank, the orifice plate dividing the tank body of the anoxic tank into an upper tank body section and a lower tank body section, the upper tank body section is located above the orifice plate, and the lower tank body section is located below the orifice plate; the aperture of the through hole of the orifice plate is smaller than the size of the carrier in the anoxic tank, the orifice plate is located below the height center of the anoxic tank, and the anoxic treatment water inlet and the anoxic treatment water outlet of the anoxic tank are both opened in the lower tank body section; an aeration device is provided in the aerobic tank, and the aerobic treatment water inlet of the aerobic tank is connected to the anoxic treatment water outlet.

[0007] In some embodiments, the apertures of the through holes of the orifice plate gradually decrease from bottom to top.

[0008] In some embodiments, the height of the upper section of the cell body is H1, the height of the lower section of the cell body is H2, and H1:H2≥3.

[0009] In some embodiments, a mounting boss matching the orifice plate is provided at the bottom of the side wall of the anoxic tank, and the upper surface of the mounting boss is supported on the bottom edge of the orifice plate.

[0010] In some embodiments, a partition is provided longitudinally in the aerobic tank, which divides the tank body of the aerobic tank into a first tank body section and a second tank body section; a lower channel connecting the first tank body section and the second tank body section is provided between the partition and the bottom of the aerobic tank, and an upper channel connecting the first tank body section and the second tank body section is provided between the partition and the upper opening of the aerobic tank; and the aeration device is located at the bottom of the second tank body section.

[0011] In some embodiments, a first guide plate is provided in the first section of the pool body, the first guide plate is connected to the bottom of the side wall of the first section of the pool body away from the partition plate, and the bottom of the first guide plate is connected to the bottom of the first section of the pool body; the first guide plate has a lower guide surface facing the lower channel, and the height of the lower guide surface gradually decreases in the direction approaching the lower channel; a second guide plate is provided in the second section of the pool body, the second guide plate is connected to the top of the side wall of the second section of the pool body away from the partition plate; the second guide plate has an upper guide surface facing the upper channel, and the height of the upper guide surface gradually increases in the direction approaching the upper channel.

[0012] In some embodiments, in the horizontal direction, the end of the lower guide surface close to the partition plate corresponds to the bottom end of the partition plate, and the end of the upper guide surface close to the partition plate corresponds to the top end of the partition plate; in the vertical direction, the top end of the lower guide surface corresponds to the bottom end of the partition plate, and the bottom end of the upper guide surface corresponds to the top end of the partition plate.

[0013] In some embodiments, the lower guide surface is an arcuate surface that bends away from the lower channel; and / or, the upper guide surface is an arcuate surface that bends away from the upper channel, and the upper guide surface is tangent to the horizontal direction at one end near the partition plate.

[0014] In some embodiments, the aerobic treatment water inlet is located in the first section of the tank body, and the aerobic treatment water inlet is opened at the bottom of the side wall of the first section of the tank body away from the dividing plate.

[0015] In some embodiments, the aerobic treatment outlet of the aerobic tank is located in the second section of the tank body, and the aerobic treatment outlet is opened at the bottom of the side wall of the second section of the tank body away from the partition plate.

[0016] The denitrification-nitrification sewage treatment device provided in the embodiment of the present application has the following beneficial effects:

[0017] A perforated plate is installed horizontally within the anoxic tank, dividing the tank into an upper section and a lower section. Because the diameter of the through-holes in the perforated plate is smaller than the size of the carriers in the anoxic tank, after the carriers are added to the opening of the anoxic tank, they are intercepted by the perforated plate in the upper section of the tank.

[0018] During operation, when sewage is introduced into the anoxic tank, since the anoxic treatment water inlet of the anoxic tank is located in the lower section of the tank body, when sewage flows from the lower section of the tank body to the upper section of the tank body, it is sprayed upward through the holes in the orifice plate. The spraying action of the water flow will drive the carrier above the orifice plate to move, which can enhance the fluidization of the carrier, thereby improving the problem of local accumulation of the carrier. Moreover, compared with the shearing effect of mechanical stirring, the spraying action of the water flow can reduce damage to the carrier. At the same time, when the sewage after denitrification treatment is discharged from the anoxic tank, since the anoxic treatment water outlet of the anoxic tank is located in the lower section of the tank body, the carrier is intercepted by the orifice plate in the upper section of the tank body, which can prevent the loss of the carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a first denitrification-nitrification wastewater treatment device provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a first working state of the first denitrification-nitrification sewage treatment device provided in an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a second working state of the first denitrification-nitrification sewage treatment device provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a third working state of the first denitrification-nitrification sewage treatment device provided in an embodiment of the present application;

[0024] Figure 5 This is a schematic structural diagram of the second denitrification-nitrification sewage treatment device provided in an embodiment of the present application.

[0025] icon:

[0026] 100-denitrification-nitrification wastewater treatment device;

[0027] 110 - anoxic tank; 111 - orifice plate; 112 - upper section of tank body; 113 - lower section of tank body; 1131 - anoxic treatment water inlet; 1132 - anoxic treatment water outlet; 1133 - mounting boss;

[0028] 120-aerobic tank; 121-aeration device; 122-partition plate; 123-first section of tank body; 1231-aerobic treatment water inlet; 1232-first guide plate; 124-second section of tank body; 1241-aerobic treatment water outlet; 1242-second guide plate; 125-lower channel; 126-upper channel. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0032] In the description of this application, it should be noted that the terms "center", "up", "down", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the 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. Therefore, they should not be understood as limitations on this application.

[0033] Furthermore, the terms “first,” “second,” “third,” etc., are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0034] Furthermore, the terms “vertical”, “parallel”, etc. do not mean that the components are required to be absolutely vertical or parallel, but may be slightly tilted.

[0035] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0036] The technical solution of this application will be exemplarily described below through some embodiments.

[0037] See also Figure 1 , an embodiment of the present application provides a denitrification-nitrification sewage treatment device 100 , including an anoxic tank 110 and an aerobic tank 120 .

[0038] A perforated plate 111 is transversely provided in the anoxic tank 110 , which divides the tank body of the anoxic tank 110 into an upper tank body section 112 and a lower tank body section 113 . The upper tank body section 112 is located above the perforated plate 111 , and the lower tank body section 113 is located below the perforated plate 111 .

[0039] The aperture of the through-hole of the orifice plate 111 is smaller than the size of the carrier in the anoxic tank 110. It is understood that, since the carrier may be of regular or irregular shape, the size of the carrier refers to the smallest external dimension passing through the center of the carrier, for example, for a cylindrical carrier, the size refers to the outer diameter of the cylinder, and for an ellipsoidal carrier, the size refers to the minor axis, so that the orifice plate 111 can intercept the carrier.

[0040] The orifice plate 111 is located below the height center of the anoxic tank 110 . The anoxic treatment water inlet 1131 and the anoxic treatment water outlet 1132 of the anoxic tank 110 are both opened in the lower section 113 of the tank body.

[0041] It should be noted that the anoxic treatment inlet 1131 and outlet 1132 are merely used to associate these outlets and inlet with the anoxic tank 110, and do not limit the additional anoxic treatment to these inlet and outlet. Similar descriptions of the inlet and outlet of the aerobic tank 120 will be explained in this context.

[0042] An aeration device 121 is provided in the aerobic tank 120 , and an aerobic treatment water inlet 1231 of the aerobic tank 120 is communicated with an anoxic treatment water outlet 1132 .

[0043] It is understood that, unless otherwise specified, the location, quantity, and type of the aeration device 121 can be conventionally selected. The aerobic tank 120 also has an aerobic treatment outlet 1241 for drainage. Unless otherwise specified, the location of the aerobic treatment outlet 1241 is not limited.

[0044] See also Figure 2 Based on the above design, the working principle of the denitrification-nitrification sewage treatment device 100 provided in the embodiment of the present application is as follows:

[0045] After carriers are added to the opening of anoxic tank 110, they are intercepted by orifice plate 111 within upper tank section 112, leaving lower tank section 113 substantially free of carriers. Because orifice plate 111 is located below the center of anoxic tank 110, upper tank section 112 has ample space, allowing for a higher carrier filling ratio.

[0046] When sewage is introduced into the anoxic tank 110, since the anoxic treatment water inlet 1131 of the anoxic tank 110 is located in the lower section 113 of the tank body, when the sewage flows from the lower section 113 of the tank body to the upper section 112 of the tank body, it is sprayed upward through the holes of the orifice plate 111. The spraying action of the water flow will drive the carrier above the orifice plate 111 to move, which can enhance the fluidization of the carrier, thereby improving the problem of easy local accumulation of the carrier. Moreover, compared with the shearing effect of mechanical stirring, the spraying action of the water flow can reduce damage to the carrier. At the same time, when the sewage after denitrification treatment is discharged from the anoxic tank 110, since the anoxic treatment water outlet 1132 of the anoxic tank 110 is located in the lower section 113 of the tank body, the carrier is intercepted by the orifice plate 111 in the upper section 112 of the tank body, which can prevent the loss of the carrier.

[0047] In some embodiments, the apertures of the orifice plate 111 gradually decrease in diameter from bottom to top. Based on this design, as the sewage flows from the lower section 113 of the tank body to the upper section 112 of the tank body, the flow rate of the sewage gradually increases as the aperture of the orifice gradually decreases. The higher flow rate of the sewage through the orifice can better drive the movement of the carriers above the orifice plate 111, and can better improve the problem of difficult fluidization and easy local accumulation of carriers in the anoxic tank 110.

[0048] In some embodiments, the height of the upper section 112 of the pool body is H1, the height of the lower section 113 of the pool body is H2, and H1:H2≥3; optionally, H1:H2≥4; as an example, H1:H2=4.5.

[0049] In some embodiments, a mounting boss 1133 is provided at the bottom of the side wall of the anoxic tank 110 to match the orifice plate 111. The upper surface of the mounting boss 1133 is supported on the bottom edge of the orifice plate 111. Based on this design, the orifice plate 111 is supported and fixed by the mounting boss 1133, and the installation and replacement of the orifice plate 111 are facilitated.

[0050] Continue to see Figure 1In some embodiments, a partition plate 122 is longitudinally disposed within the aerobic tank 120, dividing the tank body of the aerobic tank 120 into a first tank body section 123 and a second tank body section 124. A lower passage 125 is defined between the partition plate 122 and the bottom of the aerobic tank 120, connecting the first tank body section 123 and the second tank body section 124. An upper passage 126 is defined between the partition plate 122 and the upper opening of the aerobic tank 120, connecting the first tank body section 123 and the second tank body section 124. An aeration device 121 is located at the bottom of the second tank body section 124.

[0051] See also Figure 3 , based on the above design, its working principle is as follows:

[0052] During the aeration phase of the aerobic tank 120, the aeration device 121 supplies air upward within the second section 124 of the tank body, driving the carriers within the second section 124 upward. When a large number of carriers move upward to a position corresponding to the upper channel 126, some of the carriers, under the influence of fluids, pass through the upper channel 126 and enter the first section 123 of the tank body. The carriers entering the first section 123 of the tank body then move downward under the influence of gravity. When a large number of carriers move downward to a position corresponding to the lower channel 125, some of the carriers, under the influence of fluids, pass through the lower channel 125 and enter the downstream section of the tank body.

[0053] Based on the above movement process, it can be seen that during the aeration stage, the carrier can circulate well in the aerobic tank 120 , which can enhance the fluidization of the carrier in the aerobic tank 120 and help prevent local accumulation of the carrier in the aerobic tank 120 .

[0054] In some embodiments, a first guide plate 1232 is provided within the first section 123 of the tank body. The first guide plate 1232 is connected to the bottom of the sidewall of the first section 123 of the tank body away from the partition plate 122, and the bottom of the first guide plate 1232 is connected to the bottom of the first section 123 of the tank body. The first guide plate 1232 has a lower guide surface facing the lower channel 125. In other words, the lower guide surface is located on the side of the first guide plate 1232 that is closer to the lower channel 125. The height of the lower guide surface gradually decreases as it approaches the lower channel 125. In other words, the distance between the lower guide surface and the bottom of the first section 123 of the tank body gradually decreases as it approaches the lower channel 125.

[0055] A second deflector plate 1242 is disposed within the second section 124 of the tank body. The second deflector plate 1242 is connected to the top of the sidewall of the second section 124 of the tank body, away from the partition plate 122. For example, the top of the second deflector plate 1242 is aligned with the top opening of the second section 124 of the tank body. The second deflector plate 1242 has an upper deflection surface facing the upper channel 126. In other words, the upper deflection surface is located on the side of the second deflector plate 1242 that is closest to the upper channel 126. The height of the upper deflection surface gradually increases as it approaches the upper channel 126. In other words, the distance between the upper deflection surface and the top opening of the second section 124 of the tank body gradually decreases as it approaches the upper channel 126.

[0056] Based on the above design, during the aeration phase of aerobic tank 120, as the carriers circulate within aerobic tank 120, the upper guide surface directs flow toward upper channel 126, facilitating the passage of fluid and carriers through upper channel 126 into first tank section 123. The lower guide surface directs flow toward lower channel 125, facilitating the passage of fluid and carriers through lower channel 125 into second tank section 124. Assisted by first guide plate 1232 and second guide plate 1242, the carriers are able to circulate more effectively within aerobic tank 120, enhancing fluidization of the carriers within aerobic tank 120 and preventing localized accumulation of carriers within aerobic tank 120.

[0057] As an example, in the horizontal direction, the end of the lower guide surface close to the partition plate 122 corresponds to the bottom end of the partition plate 122, and the end of the upper guide surface close to the partition plate 122 corresponds to the top end of the partition plate 122; based on this design, the upper guide surface is well matched with the upper channel 126, which is conducive to improving the function of the upper guide surface in guiding the upper channel 126. In the vertical direction, the top end of the lower guide surface corresponds to the bottom end of the partition plate 122, and the bottom end of the upper guide surface corresponds to the top end of the partition plate 122; based on this design, the lower guide surface is well matched with the lower channel 125, which is conducive to improving the function of the lower guide surface in guiding the lower channel 125. It should be noted that the above-mentioned corresponding relationship can be close, aligned, or partially overlapping.

[0058] It is understandable that in the embodiments of the present application, unless otherwise specified, the upper guide surface and the lower guide surface can be arbitrarily designed as a plane or an arc surface.

[0059] Optionally, the lower guide surface is an arc-shaped surface that bends in a direction away from the lower channel 125; compared with a planar lower guide surface, the arc-shaped lower guide surface allows the bottom of the first section 123 of the pool body to have a larger space.

[0060] Optionally, the upper guide surface is an arc-shaped surface that bends in a direction away from the upper channel 126, and the end of the upper guide surface close to the partition plate 122 is tangent to the horizontal direction; compared with the upper guide surface in a planar form, the upper guide surface is designed to be an arc-shaped surface, and the end close to the partition plate 122 is tangent to the horizontal direction, so that the upper guide surface can better guide the fluid and the carrier laterally to the upper channel 126, and can more effectively prevent the fluid from splashing.

[0061] In some embodiments, the aerobic treatment water inlet 1231 is located in the first section 123 of the tank body. The aerobic treatment water inlet 1231 is opened at the bottom of the side wall of the first section 123 of the tank body away from the partition plate 122. As an example, in an embodiment configured with a first guide plate 1232, the aerobic treatment water inlet 1231 is opened at the lower guide surface.

[0062] See also Figure 4 , based on the above design, its working principle is as follows:

[0063] During the water inflow phase of aerobic tank 120, wastewater flows into the bottom of the first section 123 of the tank body, away from the partition plate 122. The water flows at a velocity toward the lower channel 125, exerting a force on the carriers at the bottom of the first section 123 of the tank body to move toward the lower channel 125. This force drives the carriers through the lower channel 125 to the bottom of the second section 124 of the tank body, preventing the carriers from accumulating at the bottom of the first section 123. Combined with the circulating movement of the carriers during the aeration phase, this can enhance the fluidization of the carriers within aerobic tank 120 and better prevent localized accumulation of carriers within the aerobic tank 120.

[0064] In addition, since the aerobic treatment water inlet 1231 is located at the bottom of the upstream side wall of the aerobic tank 120, it can better correspond to the anoxic treatment water outlet 1132 located at the bottom of the side wall of the anoxic tank 110, and the aerobic treatment water inlet 1231 can be easily connected to the anoxic treatment water outlet 1132.

[0065] It should be noted that, in the embodiment of the present application, the number of the anoxic tank 110 can be one or more, and the number of the aerobic tank 120 can also be one or more.

[0066] When the anoxic tank 110 is provided in plurality, the structures of the plurality of anoxic tanks 110 can be configured in the same design. The plurality of anoxic tanks 110 can be connected in series or in parallel, and are exemplarily connected in series. It is understood that when the plurality of anoxic tanks 110 are connected in series, the anoxic treatment outlet 1132 of the most downstream anoxic tank 110 is directly connected to the aerobic treatment water inlet 1231 of the aerobic tank 120, and the anoxic treatment outlet 1132 of the other anoxic tanks 110 is indirectly connected to the aerobic treatment water inlet 1231 of the aerobic tank 120 through the downstream anoxic tank 110.

[0067] When a plurality of aerobic tanks 120 are provided, the structures of the plurality of aerobic tanks 120 can be configured in the same design. The plurality of aerobic tanks 120 can be connected in series or in parallel, and are exemplarily connected in series. It is understood that when the plurality of aerobic tanks 120 are connected in series, the aerobic treatment water inlet 1231 of the aerobic tank 120 at the most upstream end is directly connected to the anoxic treatment water outlet 1132 of the anoxic tank 110, and the aerobic treatment water inlet 1231 of the other aerobic tanks 120 is indirectly connected to the anoxic treatment water outlet 1132 of the anoxic tank 110 through the upstream aerobic tank 120.

[0068] See also Figure 5 In an exemplary embodiment, the denitrification-nitrification wastewater treatment device 100 is provided with a plurality of aerobic tanks 120, and the plurality of aerobic tanks 120 are connected in series.

[0069] Based on the implementation scheme of providing multiple aerobic tanks 120 in series, when the aerobic treatment water inlet 1231 is opened at the bottom of the side wall of the first section 123 of the tank body away from the partition plate 122, optionally, the aerobic treatment water outlet 1241 of the aerobic tank 120 is located in the second section 124 of the tank body, and the aerobic treatment water outlet 1241 is opened at the bottom of the side wall of the second section 124 of the tank body away from the partition plate 122.

[0070] Based on this design, the upstream aerobic treatment water outlet 1241 can correspond well to the downstream aerobic treatment water inlet 1231, and the upstream aerobic treatment water outlet 1241 and the downstream aerobic treatment water inlet 1231 can be easily connected.

[0071] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A denitrification-nitrification sewage treatment device, characterized in that: It comprises an anoxic tank and an aerobic tank; a perforated plate is transversely arranged in the anoxic tank, and the perforated plate divides the tank body of the anoxic tank into an upper section and a lower section, the upper section of the tank body is located above the perforated plate, and the lower section of the tank body is located below the perforated plate; the aperture of the through hole of the perforated plate is smaller than the size of the carrier in the anoxic tank, the perforated plate is located below the height center of the anoxic tank, and the anoxic treatment water inlet and the anoxic treatment water outlet of the anoxic tank are both opened in the lower section of the tank body; an aeration device is provided in the aerobic tank, and the aerobic treatment water inlet of the aerobic tank is connected to the anoxic treatment water outlet.

2. The denitrification-nitrification sewage treatment device according to claim 1, characterized in that: The apertures of the through holes of the orifice plate gradually decrease from bottom to top.

3. The denitrification-nitrification sewage treatment device according to claim 1, characterized in that: The height of the upper section of the pool body is H1, the height of the lower section of the pool body is H2, and H1:H2≥3.

4. The denitrification-nitrification sewage treatment device according to claim 1, characterized in that: A mounting boss matching the orifice plate is provided at the bottom of the side wall of the anoxic pool, and the upper surface of the mounting boss is supported on the bottom edge of the orifice plate.

5. The denitrification-nitrification wastewater treatment device according to any one of claims 1 to 4, characterized in that: A partition plate is longitudinally provided in the aerobic pool, the partition plate dividing the pool body of the aerobic pool into a first pool body section and a second pool body section; a lower passage connecting the first pool body section and the second pool body section is provided between the partition plate and the pool bottom of the aerobic pool, and an upper passage connecting the first pool body section and the second pool body section is provided between the partition plate and the upper opening of the aerobic pool; The aeration device is located at the bottom of the second section of the pool body.

6. The denitrification-nitrification sewage treatment device according to claim 5, characterized in that: A first guide plate is provided in the first section of the pool body, and the first guide plate is connected to the bottom of the side wall of the first section of the pool body away from the partition plate, and the bottom of the first guide plate is connected to the bottom of the pool of the first section of the pool body; the first guide plate has a lower guide surface facing the lower channel, and the height of the lower guide surface gradually decreases in the direction approaching the lower channel; a second guide plate is provided in the second section of the pool body, and the second guide plate is connected to the top of the side wall of the second section of the pool body away from the partition plate; the second guide plate has an upper guide surface facing the upper channel, and the height of the upper guide surface gradually increases in the direction approaching the upper channel.

7. The denitrification-nitrification sewage treatment device according to claim 6, characterized in that: In the horizontal direction, the end of the lower guide surface close to the partition plate corresponds to the bottom end of the partition plate, and the end of the upper guide surface close to the partition plate corresponds to the top end of the partition plate; in the vertical direction, the top end of the lower guide surface corresponds to the bottom end of the partition plate, and the bottom end of the upper guide surface corresponds to the top end of the partition plate.

8. The denitrification-nitrification sewage treatment device according to claim 6, characterized in that: The lower guide surface is an arcuate surface that bends in a direction away from the lower channel; and / or, the upper guide surface is an arcuate surface that bends in a direction away from the upper channel, and one end of the upper guide surface close to the partition plate is tangent to the horizontal direction.

9. The denitrification-nitrification sewage treatment device according to claim 5, characterized in that: The aerobic treatment water inlet is located in the first section of the pool body, and the aerobic treatment water inlet is opened at the bottom of the side wall of the first section of the pool body on a side away from the partition plate.

10. The denitrification-nitrification sewage treatment device according to claim 9, characterized in that: The aerobic treatment water outlet of the aerobic pool is located in the second section of the pool body, and the aerobic treatment water outlet is opened at the bottom of the side wall of the second section of the pool body away from the partition plate.

Images