Modular device for enhancing biological denitrification

Abstract

The utility model provides a modularized device for enhancing biological denitrification, which belongs to the field of sewage treatment devices, and comprises an outer box body and an inner box body, the outer box body is a box body with openings at the front end and the rear end, the inner box body is a hollow box body, and the inner box body is arranged inside the outer box body; an annular area between the outer box body and the inner box body is arranged as an aerobic filler area, the inner part of the inner box body is arranged as an anoxic filler area, and two ends of the outer box body are respectively connected with two ends of the inner box body through connecting wall plates. The slow-release carbon source filler is filled in the anoxic filler area, provides a carbon source for denitrification reaction, has the characteristic of large specific surface area, and is beneficial to biofilm formation of denitrifying bacteria; the aerobic filler area is filled with an oxygen elastic filler, and the filler has the advantages of large specific surface area, easy biofilm formation and stable performance; the packing can be fixed in the box body, so that the packing is prevented from being distributed unevenly, blocking a pipeline and leaking; the biological denitrification can be enhanced, and the device is suitable for sewage treatment equipment needing to improve the biological denitrification capability.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment devices, in particular to a modular device for enhancing biological nitrogen removal. Background Technique

[0002] At present, the overall deteriorating trend of the water environment in China has not been fundamentally curbed. Especially in the process of urbanization and industrialization, environmental contradictions are prominent, and the control and treatment measures for various domestic sewage and industrial wastewater lag behind, resulting in large areas of urban water bodies being polluted, causing eutrophication of water bodies and forming black and odorous water bodies. With the introduction of more stringent sewage discharge standards in various places, traditional biochemical treatment processes are difficult to meet the requirements of sewage discharge standards, especially ammonia nitrogen and total nitrogen are difficult to reach the standard.

[0003] Biological nitrogen removal technology is the most common technology for treating ammonia nitrogen and total nitrogen in sewage. Nitrifying bacteria gradually convert ammonia nitrogen into nitrite nitrogen and nitrate nitrogen under aerobic conditions, and denitrifying bacteria convert nitrate nitrogen into nitrogen under anoxic conditions. In sewage treatment plants, traditional processes such as A / O, multi-stage A / O, A 2 / O and inverted A 2 / O are mostly used. However, the biological nitrogen removal ability of conventional processes is limited and it is difficult to meet the increasingly stringent effluent standards. Currently, devices such as biological aerated filters (BAF) and moving bed biofilm reactors (MBBR) integrated sewage treatment equipment are often used to strengthen biological nitrogen removal. Although each has its own advantages, the biological nitrogen removal effect is not ideal. Therefore, a modular device for enhancing biological nitrogen removal is needed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a modular device for enhancing biological nitrogen removal to solve the technical problems mentioned in the background technique. The utility model is particularly suitable for improving the biological nitrogen removal efficiency of conventional processes, and at the same time has the advantages of low investment cost, low operating cost, simple operation and maintenance, and stable treatment.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A modular device for enhancing biological nitrogen removal includes an outer box body and an inner box body. The outer box body is arranged as a box body with openings at both front and rear ends. The inner box body is arranged as a hollow box body, and the inner box body is arranged inside the outer box body. The annular area between the outer box body and the inner box body is arranged as an aerobic packing area, and the inside of the inner box body is arranged as an anoxic packing area. The two ends of the outer box body and the inner box body are respectively connected by connecting wall plates.

[0007] Further, a plurality of outer box body holes are respectively arranged on the four side surfaces of the outer box body. The diameter of the outer box body holes is set to 10 mm, and one side surface of the outer box body is connected to the outer box body by a first hand-tightening bolt.

[0008] Further, the front and rear ends of the outer box body and the inner box body are respectively connected by four connecting wall plates, and the connecting wall plates are inclined.

[0009] Further, a number of inner box body holes are respectively arranged on each surface of the inner box body, the diameter of the inner box body holes is set to 5 mm, and one side surface of the inner box body is connected to the inner box body by a second hand-tightening bolt.

[0010] Further, aerobic elastic fillers are filled in the aerobic filler area, the filling volume ratio of the aerobic elastic fillers is 50 - 60%, and the minimum size after expansion is greater than 15 mm.

[0011] Further, the aerobic elastic fillers are made of PE, PP, PPC, modified polyurethane or polymer gel.

[0012] Further, slow-release carbon source fillers are filled in the anoxic filler area, the filling volume ratio of the slow-release carbon source fillers is 70 - 80%, and the minimum size after expansion is greater than 10 mm.

[0013] Further, the slow-release carbon source fillers are made of corncobs or straws.

[0014] Due to the adoption of the above technical solutions, the utility model has the following beneficial effects:

[0015] 1. The modular device of the utility model adopts a two-stage filler layout. The slow-release carbon source fillers filled in the anoxic filler area provide carbon sources for the denitrification reaction, and at the same time have the characteristic of large specific surface area, which is helpful for the attachment of denitrifying bacteria; the aerobic elastic fillers filled in the aerobic filler area have the advantages of large specific surface area, easy attachment of film, and stable performance.

[0016] 2. The modular device of the utility model can fix the fillers inside the box body, avoiding the uneven distribution of fillers, blocking of pipelines and running of fillers.

[0017] 3. The modular device of the utility model can enhance biological nitrogen removal, has strong applicability, is widely applicable to various sewage treatment equipment that needs to improve biological nitrogen removal ability, is simple to operate and maintain, and has stable treatment. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the modular device of the utility model;

[0019] Figure 2 is a cross-sectional view of the modular device of the utility model;

[0020] Figure 3 is a top view of the modular device of the utility model;

[0021] Figure 4 is a schematic diagram of Embodiment 2.

[0022] In the attached drawings, 1 is the outer box body, 11 is the aerobic packing area, 12 is the hole of the outer box body, 13 is the first hand-tightening bolt, 2 is the inner box body, 21 is the anoxic packing area, 22 is the hole of the inner box body, 23 is the second hand-tightening bolt, 3 is the connecting wall plate, 6 is the anaerobic area of the equipment, 7 is the anoxic area of the equipment, 8 is the aerobic area of the equipment, 9 is the sedimentation area of the equipment, and 10 is the modular device. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following preferred embodiments are cited with reference to the attached drawings to further elaborate on the present utility model. However, it should be noted that many details listed in the specification are only for enabling the reader to have a thorough understanding of one or more aspects of the present utility model, and these aspects of the present utility model can be implemented even without these specific details.

[0024] As Figure 1-2 shown, a modular device for enhancing biological nitrogen removal includes an outer box body 1 and an inner box body 2. The outer box body 1 is set as a box body with openings at both the front and rear ends. The inner box body 2 is set as a hollow box body, and the inner box body 2 is arranged inside the outer box body 1. Specifically, the inner box body 2 is arranged in the middle of the inside of the outer box body 1. The annular area between the outer box body 1 and the inner box body 2 is set as the aerobic packing area 11, and the inside of the inner box body 2 is set as the anoxic packing area 21. The two ends of the outer box body 1 and the inner box body 2 are respectively connected by a connecting wall plate 3. The modular device of the present utility model can enhance biological nitrogen removal, has strong applicability, is widely applicable to various sewage treatment equipment that needs to improve the biological nitrogen removal ability, has simple operation and maintenance, and stable treatment.

[0025] As Figure 1 shown, the front and rear ends of the outer box body 1 and the inner box body 2 are respectively connected by four connecting wall plates 3, and the connecting wall plates 3 are inclined. The surface where the outer box body 1 and the inner box body 2 are connected forms an inwardly concave surface, and the connecting wall plate 3 is set as a trapezoid.

[0026] As Figure 2As shown in the figure, a number of outer box holes 12 are respectively provided on the four side surfaces of the outer box body 1. The diameter of the outer box holes 12 is set to 10 mm. One side surface of the outer box body 1 is connected to the outer box body 1 through a first hand-tightening bolt 13. The aerobic packing area 11 is communicated with the outside through the outer box holes 12; for the side surface connected to the outer box body 1 through the first hand-tightening bolt 13, by unscrewing the first hand-tightening bolt 13, the side surface of the outer box body 1 can be opened, which is convenient for internal maintenance. The aerobic packing area 11 is filled with aerobic elastic packing. The packing volume ratio of the aerobic elastic packing is 50 - 60%, and the minimum size after expansion is greater than 15 mm. The aerobic elastic packing is made of PE, PP, PPC, modified polyurethane or polymer gel. The packing volume of the aerobic elastic packing is 50 - 60% of the volume of the aerobic packing area 11. The aerobic elastic packing filled in the aerobic packing area 11 has the advantages of large specific surface area, easy film formation and stable performance.

[0027] As Figure 3 shown in the figure, a number of inner box holes 22 are respectively provided on each surface of the inner box body 2. The diameter of the inner box holes 22 is set to 5 mm. One side surface of the inner box body 2 is connected to the inner box body 2 through a second hand-tightening bolt 23. The front and rear ends of the inner box body 2 are communicated with the outside through the inner box holes 22, and the remaining side surfaces of the inner box body 2 are communicated with the aerobic packing area 11 through the inner box holes 22; for the side surface connected to the inner box body 2 through the second hand-tightening bolt 23, by unscrewing the second hand-tightening bolt 23, the side surface of the inner box body 2 can be opened, which is convenient for internal maintenance. The anoxic packing area 21 is filled with slow-release carbon source packing. The packing volume ratio of the slow-release carbon source packing is 70 - 80%, and the minimum size after expansion is greater than 10 mm. The slow-release carbon source packing is made of corncob or straw. The packing volume of the slow-release carbon source packing is 70 - 80% of the volume of the anoxic packing area 21. The slow-release carbon source packing filled in the anoxic packing area 21 provides a carbon source for the denitrification reaction and has the characteristic of large specific surface area, which helps the denitrifying bacteria to form a film. The slow-release carbon source packing can also be made of other natural celluloses.

[0028] Example 1

[0029] A modular device for enhancing biological nitrogen removal, comprising an outer box body 1 and an inner box body 2. The outer box body 1 is a box body with openings at both front and rear ends. The inner box body 2 is a hollow box body, and the inner box body 2 is arranged inside the outer box body 1. Specifically, the inner box body 2 is arranged in the middle of the inside of the outer box body 1. The annular area between the outer box body 1 and the inner box body 2 is set as an aerobic packing area 11, and the inside of the inner box body 2 is set as an anoxic packing area 21. The two ends of the outer box body 1 and the inner box body 2 are respectively connected by connecting wall plates 3. The front and rear ends of the outer box body 1 and the inner box body 2 are respectively connected by four connecting wall plates 3, and the connecting wall plates 3 are inclined. The surface where the outer box body 1 and the inner box body 2 are connected forms an inwardly concave surface, and the connecting wall plates 3 are trapezoidal. The outer box body 1 can be set as a cube box body with an external size of 0.4m * 0.4m * 0.4m, and the inner box body 2 can be set as a cube box body with an external size of 0.3m * 0.3m * 0.3m.

[0030] A number of outer box body holes 12 are respectively arranged on the four side surfaces of the outer box body 1. The diameter of the outer box body holes 12 is set to 10mm. One side surface of the outer box body 1 is connected to the outer box body 1 by a first hand-tightening bolt 13. The aerobic packing area 11 is filled with aerobic elastic packing, and the filling volume ratio of the aerobic elastic packing is 50 - 60%, and the minimum size after expansion is greater than 15mm. The aerobic elastic packing is made of PE, PP, PPC, modified polyurethane or polymer gel.

[0031] A number of inner box body holes 22 are respectively arranged on each surface of the inner box body 2. The diameter of the inner box body holes 22 is set to 5mm. One side surface of the inner box body 2 is connected to the inner box body 2 by a second hand-tightening bolt 23. The anoxic packing area 21 is filled with slow-release carbon source packing, and the filling volume ratio of the slow-release carbon source packing is 70 - 80%, and the minimum size after expansion is greater than 10mm. The slow-release carbon source packing is made of corncob or straw.

[0032] When using the modular device of the present utility model, for different water qualities and water volumes, different numbers of modular devices for enhancing biological nitrogen removal are selected through design calculation, and then the modular devices for enhancing biological nitrogen removal are fixed in the aerobic aeration part (aerobic area of the equipment) of the original sewage treatment equipment (or pool). The specific fixing method can be selected according to the on-site conditions, such as bracket fixing, hanging fixing, etc. After the modular device is put into the aerobic area, the activated sludge is mixed with the aerobic elastic packing in the aerobic packing area through aeration, and gradually forms a biofilm on the surface of the aerobic packing. At the same time, in the anoxic packing area, the dissolved oxygen is lower than 0.5mg / L, forming an anoxic environment conducive to denitrification. The carbon source released by the slow-release carbon source packing can also provide an electron donor for denitrification, and denitrification gradually forms a biofilm on the surface of the slow-release carbon source packing, so as to achieve the effect of enhancing biological nitrogen removal. The modular device of the present utility model can fix the packing inside the box body, avoiding problems such as uneven distribution of the packing, blockage of pipelines and running-off of the packing, and can enhance biological nitrogen removal.

[0033] Example 2

[0034] A certain rural sewage treatment station originally had a sewage treatment project with a capacity of 1000 m 3 / d. The initial design influent and effluent indexes of the project are shown in Table 1, and it only needs to meet the first-class B standard of the "Pollutant Discharge Standard for Municipal Wastewater Treatment Plants". Later, the owner informed that the effluent standard needs to be improved to the first-class A standard:

[0035] Table 1 Initial design influent and effluent indexes of the project

[0036] Index COD (mg / L) TN (mg / L) <![CDATA[NH 3 -N (mg / L)]]> TP (mg / L) SS (mg / L) Influent 300 50 45 6 100 First-class B standard ≤60 ≤20 ≤8 ≤1 ≤20 First-class A standard ≤50 ≤10 ≤5 ≤0.5 ≤10

[0037] Brief description of the adopted process flow: Rural domestic sewage flows into the regulating tank with a grille through the existing pipeline. A liquid level gauge is set in the regulating tank. When the water level rises to a certain height, the water pump in the tank starts to pump the sewage to the integrated sewage treatment equipment. The sewage passes through the anaerobic zone 6, anoxic zone 7, aerobic zone 8 and sedimentation zone 9 of the equipment in turn. The supernatant after sedimentation is disinfected and then discharged up to the standard. The sludge in the sedimentation tank is refluxed to the anaerobic zone 6, and the excess sludge is discharged regularly. Among them, the sludge reflux ratio is set at 50%, and the nitrification liquid reflux ratio is set at 100%. During the initial operation process, the effluent can stably meet the first-class B standard of the "Pollutant Discharge Standard for Municipal Wastewater Treatment Plants", but limited by the total nitrogen and ammonia nitrogen removal rates, it cannot reach the first-class A standard.

[0038] The modular device of the present utility model is adopted to enhance the biological nitrogen removal capacity of this project. As Figure 4 shown, 10 modular devices 10 of the present utility model are divided into two groups. By making carbon steel hanging brackets, they are hung on the wall plates on both sides of the aerobic zone 8 of the integrated sewage treatment equipment. In the longitudinal height, the top is more than 1 m below the water surface, and the bottom is more than 0.5 m above the aeration pipe. The annular area between the outer box and the inner box is the aerobic packing area, filled with aerobic elastic packing, and the filling volume ratio is 50%-60%. The inner box is the anoxic packing area, filled with slow-release carbon source packing, and the filling volume ratio is 70%-80%. Among them, the raw materials of the aerobic elastic packing are PE, PP, PPC, modified polyurethane or polymer gel, and the raw materials of the slow-release carbon source packing are mainly natural cellulose such as corncobs and straws. After the modular device 10 of the present utility model is put into the aerobic area, the activated sludge is mixed with the aerobic elastic packing in the aerobic packing area through aeration, and gradually forms a biofilm on the surface of the aerobic packing. At the same time, in the anoxic packing area, the dissolved oxygen is lower than 0.5 mg / L, forming an anoxic environment conducive to denitrification. The carbon source released by the slow-release carbon source packing can also provide the electron donor for denitrification, and denitrification gradually forms a biofilm on the surface of the slow-release carbon source packing, so as to achieve the effect of enhancing biological nitrogen removal.

[0039] After one month of operation, the modular device of the present utility model was taken out for observation. It was found that there were obvious biofilms on the surfaces of the aerobic elastic packing and the slow-release carbon source packing. After normal operation, samples were taken at the inlet and outlet of the site for one consecutive week, and the obtained data are shown in Table 2:

[0040] Table 2 Inlet and outlet water after using the modular device of the present utility model

[0041]

[0042] The above data show that after being treated by the modular device of the present utility model, the effluent can stably meet the first-class A standard of the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants". The modular device of the present utility model can enhance biological nitrogen removal.

[0043] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.

Claims

1. A modular device for enhancing biological denitrification, characterized in that: The invention comprises an outer box (1) and an inner box (2), wherein the outer box (1) is configured as a box with openings at both ends, and the inner box (2) is configured as a hollow box, and the inner box (2) is arranged inside the outer box (1), the annular area between the outer box (1) and the inner box (2) is configured as an aerobic filler area (11), and the interior of the inner box (2) is configured as an anoxic filler area (21), and the two ends of the outer box (1) and the inner box (2) are respectively connected by connecting wall panels (3).

2. A modular device for enhancing biological denitrification according to claim 1, characterized in that: A plurality of outer box body holes (12) are respectively arranged on the four side surfaces of the outer box body (1), and the diameter of the outer box body hole (12) is set to 10 mm. One side surface of the outer box body (1) is connected to the outer box body (1) via a first hand-tightened bolt (13).

3. A modular device for enhancing biological denitrification according to claim 1, characterized in that: The front and rear ends of the outer box body (1) and the inner box body (2) are respectively connected via four connecting wall panels (3), and the connecting wall panels (3) are arranged obliquely.

4. A modular device for enhancing biological denitrification according to claim 1, characterized in that: A plurality of inner box body holes (22) are respectively arranged on each surface of the inner box body (2), and the diameter of the inner box body hole (22) is set to 5 mm. One side surface of the inner box body (2) is connected to the inner box body (2) via a second hand-tightened bolt (23).

5. A modular device for enhancing biological denitrification according to claim 1, characterized in that: The aerobic filler area (11) is filled with aerobic elastic filler, the filling volume ratio of the aerobic elastic filler is 50-60%, and the minimum size after expansion is greater than 15mm.

6. A modular device for enhancing biological denitrification according to claim 1, characterized in that: The oxygen-deficient filler area (21) is filled with a slow-release carbon source filler, the filling volume ratio of the slow-release carbon source filler is 70-80%, and the minimum size after expansion is greater than 10 mm.

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