Denitrification equipment system for sewage treatment

Abstract

The denitrification equipment system for sewage treatment comprises a secondary sedimentation tank, a denitrification filter tank and an activation tank, the secondary sedimentation tank comprises a secondary sedimentation tank water outlet tank, the denitrification filter tank comprises a water distribution area, a denitrification filler area and a water outlet area which are sequentially arranged from bottom to top, the secondary sedimentation tank water outlet tank is connected with a first pipeline system, and the second pipeline system is connected with a second pipeline system. The activation tank is connected with a second pipeline system, the water outlet area is respectively connected with a third pipeline system and a fourth pipeline system, the third pipeline system is connected with an external drainage tank, and the fourth pipeline system is connected with a secondary sedimentation tank; acetic acid in the activation tank enters the denitrification filter tank, calcium carbonate is contained in the denitrification filler, the acetic acid reacts with the calcium carbonate to directly generate carbon dioxide, the carbon dioxide is directly used for demolding exhaust and sludge discharge, normal sewage treatment cannot be affected in the process, and the sewage treatment efficiency is guaranteed.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of sewage treatment, and in particular to a denitrification equipment system for sewage treatment. Background Art

[0002] In recent years, with the attention paid by the state and local governments to pollution control, the state has tightened the standards for sewage treatment, and the discharge standards implemented by sewage treatment plants in various regions have gradually been raised from Class B of the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002) to Class A, or Class IV surface water standards, or even special discharge limit standards. The high discharge standards mainly require stricter control of organic matter, nitrogen and phosphorus in sewage treatment plants, so it is necessary to focus on or improve the setting of deep treatment processes in the transformation, especially the application of denitrification filters.

[0003] The denitrification filter is a filter with denitrification function that can further remove total nitrogen. It is the most important component of the deep treatment of sewage treatment plants. Currently, the commonly used ones are activated sand filters, denitrification biological filters, denitrification deep bed filters, etc. However, the denitrification filter has the problem of packing compaction. The solid particles in the water will gradually accumulate on the surface of the packing in the filter, affecting the water flow performance and filtration effect of the filter. Therefore, the denitrification filter needs to be air-washed and water-washed. During the air-washing and water-washing process, the progress of sewage treatment is affected. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model:

[0005] The utility model provides a denitrification equipment system for sewage treatment, which is used to solve the technical problems existing in the above-mentioned background technology.

[0006] 2. Technical solution:

[0007] To achieve the above-mentioned purpose, the technical scheme provided by the utility model is as follows: a denitrification equipment system for sewage treatment, comprising a secondary sedimentation tank, a denitrification filter tank and an activation tank, wherein the secondary sedimentation tank comprises a secondary sedimentation tank outlet tank, the denitrification filter tank comprises a water distribution area, a denitrification filler area and a water outlet area which are sequentially arranged from bottom to top, the water distribution area is provided with a water inlet pipe, the water inlet pipe is provided with a first one-way valve, the secondary sedimentation tank outlet tank is connected to a first pipeline system, the activation tank is connected to a second pipeline system, the first pipeline system, the second pipeline system and the water inlet pipe are connected through a first three-way joint, the water outlet area is respectively connected to a third pipeline system and a fourth pipeline system, the third pipeline system is connected to an external drainage tank, and the fourth pipeline system is connected to the secondary sedimentation tank;

[0008] A filter plate is arranged between the water distribution area and the denitrification filler area. A denitrification filler is arranged in the denitrification filler area. The denitrification filler comprises calcium carbonate. Acetic acid is stored in the activation tank.

[0009] Preferably, the first piping system includes a first connecting pipe connected to the outlet tank of the secondary sedimentation tank, the other end of the first connecting pipe is connected to the input end of the denitrification pump, the output end of the denitrification pump is connected to the first three-way joint through a second connecting pipe, and the second connecting pipe is provided with a first flow meter and a first valve.

[0010] Preferably, the second piping system includes a third connecting pipe connected to the first three-way joint, the other end of the third connecting pipe is connected to the output end of the activation pump, and the input end of the activation pump is connected to the activation tank through a fourth connecting pipe.

[0011] Preferably, the fourth connecting pipe is provided with a second valve, and the third connecting pipe is provided with a third valve, a second flow meter and a second one-way valve.

[0012] Preferably, the third pipeline system includes a fifth connecting pipe connected to the water outlet area, the other end of the fifth connecting pipe is connected to the external drainage pool, and the fifth connecting pipe is provided with a fourth valve and a third flow meter.

[0013] Preferably, the fourth pipeline system includes a sixth connecting pipe connected to the water outlet area, the other end of the sixth connecting pipe is connected to the second three-way joint, the second three-way joint is also connected to the seventh connecting pipe and the eighth connecting pipe, the seventh connecting pipe is connected to the second sedimentation tank, and the eighth connecting pipe is connected to the water outlet tank of the second sedimentation tank.

[0014] Preferably, the sixth connecting pipe is provided with a fifth valve and a fourth flow meter, the seventh connecting pipe is provided with a sixth valve, and the eighth connecting pipe is provided with a seventh valve.

[0015] 3. Beneficial effects:

[0016] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0017] The utility model is provided with a denitrification filter tank and an activation tank. When the denitrification filter tank is blocked, the sewage in the outlet tank of the secondary sedimentation tank enters the denitrification filter tank through the first pipeline system. At the same time, the second pipeline system is opened, and the acetic acid in the activation tank enters the denitrification filter tank. The denitrification filler contains calcium carbonate. The acetic acid reacts with the calcium carbonate to directly produce carbon dioxide. The carbon dioxide is directly used for film stripping, exhaust and mud discharge. This process will not affect the normal progress of sewage treatment, because the flow of sewage in the tank can still be maintained during the reaction process, thereby achieving the effect of film stripping, exhaust and mud discharge without interrupting sewage treatment. The generation of carbon dioxide does not require additional oxygen supply, so this reaction will not destroy the anoxic environment in the sewage, thereby maintaining the feasibility of denitrification, maintaining the activity of microorganisms in the sewage treatment process, and ensuring the efficiency of sewage treatment.

[0018] The dilute acetic acid in the activation tank of the utility model reacts with the calcium carbonate in the denitrification filter tank to generate carbon dioxide gas. The cost of using the dilute acetic acid as a demoulding agent is low, and the dilute acetic acid can be easily obtained in industry, so the use cost is low. At the same time, the utility model has a simple structure and does not require complex equipment and control systems, so the one-time investment equipment cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0020] Reference numerals:

[0021] 1. Secondary sedimentation tank; 2. Denitrification filter tank; 21. Water distribution area; 22. Denitrification filling area; 23. Water inlet pipe; 24. First one-way valve; 25. Water outlet area; 3. Activation tank; 4. Secondary sedimentation tank outlet tank; 5. First pipeline system; 51. First connecting pipe; 52. Denitrification pump; 53. First flow meter; 54. Second connecting pipe; 55. First valve; 6. Secondary pipeline system; 61. Third connecting pipe; 62. Activation pump; 63. Fourth Connecting pipe; 64, second valve; 65, third valve; 66, second flow meter; 67, second one-way valve; 7, third piping system; 71, fifth connecting pipe; 72, fourth valve; 73, third flow meter; 8, fourth piping system; 81, sixth connecting pipe; 82, fifth valve; 83, fourth flow meter; 84, seventh connecting pipe; 85, sixth valve; 86, three-way connector; 87, eighth connecting pipe; 88, seventh valve. DETAILED DESCRIPTION

[0022] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "page", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] It should be noted that the structures not introduced in the present invention are not related to the design points and improvement directions of the present invention, and are the same as the prior art or can be implemented by using the prior art, and will not be described in detail here. Example

[0027] See attached Figure 1A denitrification equipment system for sewage treatment includes a secondary sedimentation tank 1, a denitrification filter tank 2 and an activation tank 3, the secondary sedimentation tank 1 includes a secondary sedimentation tank outlet tank 4, the denitrification filter tank 2 includes a water distribution area 21, a denitrification filler area 22 and a water outlet area 25 arranged from bottom to top, the water distribution area 21 is provided with a water inlet pipe 23, the water inlet pipe 23 is provided with a first one-way valve 24, the secondary sedimentation tank outlet tank 4 is connected to a first pipeline system 5, the activation tank 3 is connected to a second pipeline system 6, the first pipeline system 5, the second pipeline system 6 and the water inlet pipe 23 are connected through a first three-way joint, the water outlet area 25 is respectively connected to a third pipeline system 7 and a fourth pipeline system 8, the third pipeline system 7 is connected to an external drainage tank, and the fourth pipeline system 8 is connected to the secondary sedimentation tank 1;

[0028] A filter plate is arranged between the water distribution area 21 and the denitrification filler area 22 . A denitrification filler is arranged in the denitrification filler area 22 . The denitrification filler includes calcium carbonate. Acetic acid is stored in the activation tank 3 .

[0029] The first piping system 5 includes a first connecting pipe 51 connected to the secondary sedimentation tank outlet tank 4, the other end of the first connecting pipe 51 is connected to the input end of the denitrification pump 52, the output end of the denitrification pump 52 is connected to the first three-way joint through a second connecting pipe 54, and the second connecting pipe 54 is provided with a first flow meter 53 and a first valve 55.

[0030] The second piping system 6 includes a third connecting pipe 61 connected to the first three-way joint, the other end of the third connecting pipe 61 is connected to the output end of the activation pump 62, and the input end of the activation pump 62 is connected to the activation tank 3 through the fourth connecting pipe 63.

[0031] The fourth connecting pipe 63 is provided with a second valve 64 , and the third connecting pipe 61 is provided with a third valve 65 , a second flow meter 66 and a second one-way valve 67 .

[0032] The third pipeline system 7 includes a fifth connecting pipe 71 connected to the water outlet area 25 , the other end of the fifth connecting pipe 71 is connected to the external drainage tank, and a fourth valve 72 and a third flow meter 73 are provided on the fifth connecting pipe 71 .

[0033] The fourth pipeline system 8 includes a sixth connecting pipe 81 connected to the water outlet area 25, the other end of the sixth connecting pipe 81 is connected to the second three-way joint 86, the second three-way joint 86 is also connected to the seventh connecting pipe 84 and the eighth connecting pipe 87, the seventh connecting pipe 84 is connected to the second sedimentation tank 1, and the eighth connecting pipe 87 is connected to the second sedimentation tank outlet tank 4.

[0034] The sixth connecting pipe 81 is provided with a fifth valve 82 and a fourth flow meter 83 , the seventh connecting pipe 84 is provided with a sixth valve 85 , and the eighth connecting pipe 87 is provided with a seventh valve 88 .

[0035] Working principle:

[0036] The water distribution area 21 receives the effluent from the secondary sedimentation tank effluent tank 4 through the denitrification pump 52, the water inlet pipe 23 and the first pipeline system 5, and evenly distributes it to the lower part of the denitrification filter tank 2 to ensure that the water flow is evenly distributed in the entire denitrification filter tank 2. The sewage in the water distribution area 21 enters the denitrification filler area 22 through the filter plate. The denitrification filler area 22 is filled with denitrification fillers, including calcium carbonate, which is the area where the denitrification reaction occurs.

[0037] The second valve 64, the third valve 65 and the second one-way valve 67 of the second pipeline system 6 are opened, and the dilute acetic acid in the activation tank 3 enters the denitrification filter tank 2 under the action of the activation pump 62, the third connecting pipe 61 and the fourth connecting pipe 63. The dilute acetic acid reacts with calcium carbonate to produce carbon dioxide, which is directly used for film stripping, exhaust and mud discharge. This process will not affect the normal progress of sewage treatment, because the sewage can still flow in the tank during the reaction, thereby achieving the effect of film stripping, exhaust and mud discharge without interrupting sewage treatment. The generation of carbon dioxide does not require additional oxygen supply, so this reaction will not destroy the anoxic environment in the sewage, thereby maintaining the feasibility of denitrification and maintaining the activity of microorganisms in the sewage treatment process.

[0038] The treated sewage enters the outlet area 25. If it meets the discharge standards, the fourth valve 72 of the third pipeline system 7 is opened and discharged to the external drainage pool through the fifth connecting pipe 71. During this period, the sewage flow in the fifth connecting pipe 71 is measured by the third flow meter 73.

[0039] When the discharge standard is not met, if the effluent quality of the effluent area 25 is too low, the sewage needs to be returned to the secondary sedimentation tank 1 for deep treatment. At this time, the fifth valve 82 and the sixth valve 85 are opened, and the sewage enters the secondary sedimentation tank 1 through the sixth connecting pipe 81 and the seventh connecting pipe 84; if the effluent quality is slightly low, and the effluent of the denitrification filter has been properly pretreated and regulated, it can be returned to the effluent tank 4. At this time, the fifth valve 82 and the seventh valve 88 are opened, and the sewage enters the secondary sedimentation tank effluent tank 4 through the sixth connecting pipe 81 and the eighth connecting pipe 87. Treat the sewage again to further improve the treatment effect. During this period, the flow rate of the refluxed sewage is monitored by the fourth flowmeter 83.

[0040] The dilute acetic acid in the activation tank 3 reacts with the calcium carbonate in the denitrification filter tank 2 to produce carbon dioxide gas. The cost of using dilute acetic acid as a demoulding agent is low, and dilute acetic acid can be easily obtained in industry, so the cost of use is low. At the same time, the structure is simple, and no complicated equipment and control system are required, so the one-time equipment cost is low.

[0041] Although a one-time investment is required to purchase the activation tank and related equipment in the early stage, this investment is reasonable considering its high efficiency and low cost in long-term operation. The durability and easy maintenance of the equipment ensure long-term economic benefits. The system is designed with environmental friendliness in mind, reducing the burden on the environment by reducing dependence on external energy and reducing energy consumption. At the same time, the use of carbon dioxide produced by chemical reactions as a means of exhaust and sludge discharge reduces the generation of waste, which is in line with the concept of sustainable development.

[0042] The above-described embodiments only express a certain implementation method of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the patent of the utility model shall be based on the attached claims.

Claims

1. A denitrification equipment system for sewage treatment, characterized in that: The invention comprises a secondary sedimentation tank (1), a denitrification filter tank (2) and an activation tank (3), wherein the secondary sedimentation tank (1) comprises a secondary sedimentation tank outlet tank (4), the denitrification filter tank (2) comprises a water distribution area (21), a denitrification filler area (22) and a water outlet area (25) arranged in sequence from bottom to top, the water distribution area (21) is provided with a water inlet pipe (23), the water inlet pipe (23) is provided with a first non-return valve (24), the secondary sedimentation tank outlet tank (4) is connected to a first pipeline system (5), the activation tank (3) is connected to a second pipeline system (6), the first pipeline system (5), the second pipeline system (6) and the water inlet pipe (23) are connected via a first three-way joint, the water outlet area (25) is connected to a third pipeline system (7) and a fourth pipeline system (8), respectively, the third pipeline system (7) is connected to an external drainage tank, and the fourth pipeline system (8) is connected to the secondary sedimentation tank (1); A filter plate is provided between the water distribution area (21) and the denitrification filler area (22); a denitrification filler is provided in the denitrification filler area (22); the denitrification filler includes calcium carbonate; and acetic acid is stored in the activation tank (3).

2. A denitrification equipment system for sewage treatment according to claim 1, characterized in that: The first pipeline system (5) comprises a first connecting pipe (51) connected to the secondary sedimentation tank outlet tank (4); the other end of the first connecting pipe (51) is connected to the input end of a denitrification pump (52); the output end of the denitrification pump (52) is connected to the first three-way joint via a second connecting pipe (54); and the second connecting pipe (54) is provided with a first flow meter (53) and a first valve (55).

3. A denitrification equipment system for sewage treatment according to claim 1, characterized in that: The second pipeline system (6) comprises a third connecting pipe (61) connected to the first three-way joint, the other end of the third connecting pipe (61) is connected to the output end of the activation pump (62), and the input end of the activation pump (62) is connected to the activation tank (3) via a fourth connecting pipe (63).

4. A denitrification equipment system for sewage treatment according to claim 3, characterized in that: The fourth connecting pipe (63) is provided with a second valve (64), and the third connecting pipe (61) is provided with a third valve (65), a second flow meter (66) and a second one-way valve (67).

5. The denitrification equipment system for sewage treatment according to claim 1, characterized in that: The third pipeline system (7) comprises a fifth connecting pipe (71) connected to the water outlet area (25), the other end of the fifth connecting pipe (71) being connected to the external drainage pool, and the fifth connecting pipe (71) being provided with a fourth valve (72) and a third flow meter (73).

6. A denitrification equipment system for sewage treatment according to claim 1, characterized in that: The fourth pipe system (8) comprises a sixth connecting pipe (81) connected to the water outlet area (25), the other end of the sixth connecting pipe (81) being connected to a second three-way joint (86), the second three-way joint (86) being further connected to a seventh connecting pipe (84) and an eighth connecting pipe (87), the seventh connecting pipe (84) being connected to the secondary sedimentation tank (1), and the eighth connecting pipe (87) being connected to the water outlet tank (4) of the secondary sedimentation tank.

7. A denitrification equipment system for sewage treatment according to claim 6, characterized in that: The sixth connecting pipe (81) is provided with a fifth valve (82) and a fourth flow meter (83), the seventh connecting pipe (84) is provided with a sixth valve (85), and the eighth connecting pipe (87) is provided with a seventh valve (88).

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