Sulfur autotrophic denitrification filter

Abstract

The utility model discloses a kind of sulfur autotrophy denitrification filter tank, including denitrification filter tank main body, water distribution area is provided in the denitrification filter tank main body, water distribution device is provided in the water distribution area, water distribution device is connected with water inlet device, filter material layer is provided in the denitrification filter tank main body, there is filter material feeding device on the filter material layer top, drainage pipeline is provided in the denitrification filter tank main body lower part;The water distribution device includes water distribution tank connected with water inlet device, water distribution tank at least one side is provided with water distribution pipe, water distribution hole is provided on the water distribution pipe, the application is in filter tank top using fixed point water distribution, setting uniform water distribution hole, each water distribution hole is connected water distribution pipe, avoid increasing dissolved oxygen in water when water distribution, to reduce the loss of filter material, to reduce operating cost in turn.

Description

Technical Field

[0001] This utility model relates to, specifically, a sulfur autotrophic denitrification filter. Background Technology

[0002] Sulfur autotrophic denitrification biological filters are a new type of fixed-bed biofilm reactor. When wastewater flows from bottom to top or from top to bottom (depending on the type of filter), the microorganisms of sulfur-degrading bacteria utilize inorganic carbon (CO2, HCO3-, CO32-) as a carbon source and mainly use inorganic matter (S, S2-, S2O32-, etc.) as electron donors for nitrate nitrogen reduction to complete the microbial metabolism, reducing NO3-N in nitrate nitrogen-polluted water to N2 and releasing it into the atmosphere, ultimately achieving TN removal.

[0003] A typical metabolic process is as follows: The stoichiometric chemical formula for autotrophic denitrification using elemental sulfur as an electron donor: 55S+50NO3-+38H2O+20CO2+4NH4+→4C5H7O2N+25N2+55SO4-+64H+ After calculation, removing 1gN consumes 2.51gS, resulting in 7.54g of sulfate.

[0004] Stoichiometric chemical formula for autotrophic denitrification using pyrite as an electron donor: 2FeS2+6NO3-+4H2O→6N2+4SO4-+2H++2Fe(OH)3 After calculation, 1g of N is removed, 1.42g of FeS2 is consumed, and 2.28g of sulfate is produced.

[0005] Combining a sulfur autotrophic denitrification biological filter with a deep-bed heterogeneous denitrification filter, and operating the sulfur autotrophic denitrification biological filter and the heterogeneous denitrification deep-bed filter in parallel, allows for switching between them. This approach can leverage the advantages of both methods, save carbon sources, achieve good TN and SS removal effects, and ensure that the effluent COD does not exceed the standard.

[0006] However, most existing filters have a structure with water entering from one end and exiting from the other, which leads to uneven water flow within the filter and an increase in dissolved oxygen in the water, resulting in excessive consumption of filter media and increased operating costs. Utility Model Content

[0007] The purpose of this invention is to provide a sulfur autotrophic denitrification filter to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A sulfur autotrophic denitrification filter includes a denitrification filter body, a water distribution area is provided inside the denitrification filter body, a water distribution device is provided inside the water distribution area, the water distribution device is connected to a water inlet device, a filter media layer is provided inside the denitrification filter body, a filter media dosing device is provided above the filter media layer, and a drainage pipe is provided at the bottom of the denitrification filter body. The water distribution device includes a water distribution tank connected to the water inlet device, and a water distribution pipe is provided on at least one side of the water distribution tank, with water distribution holes provided on the water distribution pipe.

[0009] As a further embodiment of this utility model: the water inlet device includes a water inlet pipe, and a weir and a water outlet are provided at the rear end of the water inlet pipe. The water distribution trough is connected to the outlet end of the water outlet.

[0010] As a further embodiment of this utility model, two sets of water distribution devices are provided in the water distribution area.

[0011] As a further embodiment of this utility model: water distribution pipes are provided on both sides of the water distribution tank, and multiple rows of water distribution pipes are provided on each side.

[0012] As a further embodiment of this utility model: the filter media layer is provided with a filter plate, a support layer and a filter media layer in sequence from bottom to top, and a filter head is provided below the filter plate.

[0013] As a further embodiment of this utility model: the filter plate is a precast concrete filter plate, and the filter head is a 290mm ABS filter head.

[0014] As a further embodiment of this utility model: the filter media feeding device is located above the main body of the denitrification filter tank, and the filter media feeding device includes a filter media storage pipe and a screw conveyor. The discharge end of the screw conveyor is connected to the top of the filter media layer through at least one feeding pipe.

[0015] As a further embodiment of this utility model: a backwash inlet pipe is connected to the drainage pipe, and a backwash discharge pipe is provided on one side of the main body of the denitrification filter tank.

[0016] As a further embodiment of this utility model, a backwashing air inlet pipe is provided on one side of the main body of the denitrification filter.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. This application adopts fixed-point water distribution at the top of the filter tank, with uniform water distribution holes. Each water distribution hole is connected to a water distribution pipe to avoid increasing dissolved oxygen in the water during water distribution, thereby reducing the loss of filter media and thus reducing operating costs.

[0018] 2. This application utilizes inorganic carbon as a carbon source and denitrification packing as an electron donor to complete the biological denitrification process, reducing nitrate nitrogen to nitrogen gas, thereby removing total nitrogen. The reaction process does not require the addition of an organic carbon source, and there is basically no sludge production, saving carbon source and sludge disposal costs. It has high denitrification efficiency and does not require the addition of an external organic carbon source, thus achieving efficient and low-cost denitrification.

[0019] 3. This application adopts an automatic filter media addition device. The height of the filter media is monitored by a monitoring instrument. When the filter media loss exceeds 2cm, the system automatically adds filter media. In order to ensure that the filter media can be spread evenly in the filter tank, the filter media is added in an intermittent and multiple addition method.

[0020] 4. This application has multiple functions, removing total phosphorus and suspended solids simultaneously while denitrifying, reducing reagent costs. It boasts a high total nitrogen removal rate and fast reaction efficiency, reaching up to 98% total nitrogen removal rate, making it suitable for extreme deep denitrification treatment. Simultaneous phosphorus removal efficiency is also above 60%. It has a wide range of applications, suitable for municipal and industrial wastewater, with influent total nitrogen levels ranging from 5-2500 mg / L. It is adaptable to extreme weather conditions, operating at temperatures from 10-40℃, and can handle wastewater salinity below 4%. Operation and maintenance are simple, requiring no pH adjustment, and it features a long backwashing cycle, typically 1-3 months for the filter. Attached Figure Description

[0021] Figure 1 This is a top view of this embodiment; Figure 2 This is an example. Figure 1 Sectional view of AA; Figure 3 , Figure 4 This is a schematic diagram of the water distribution structure in this embodiment; Figure 5 This is a schematic diagram of the filter media addition structure in this embodiment.

[0022] In the diagram: 1-Denitrification filter body, 2-Inlet pipe, 3-Water weir, 4-Water outlet, 5-Water distribution area, 6-Water distribution trough, 7-Water distribution pipe, 8-Filter media layer, 9-Support layer, 10-Filter plate, 11-Filter head, 12-Backwash air inlet pipe, 13-Drainage pipe, 14-Backwash water inlet pipe, 15-Filter media storage tank, 16-Screw conveyor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 In this embodiment of the present invention, a sulfur autotrophic denitrification filter includes a denitrification filter body 1, a water distribution area 5 is provided in the denitrification filter body 1, a water distribution device is provided in the water distribution area 5, the water distribution device includes a water distribution trough 6 connected to a water inlet device, a water distribution pipe 7 is provided on at least one side of the water distribution trough 6, and a water distribution hole is provided on the water distribution pipe 7. In this embodiment, two sets of water distribution devices are provided in the water distribution area 5, and water distribution pipes 7 are provided on both sides of the water distribution trough 6, with multiple rows of water distribution pipes 7 on each side.

[0025] Please see Figure 1 , Figure 2 , Figure 5 The water distribution device is connected to the water inlet device, which includes a water inlet pipe 2. The rear end of the water inlet pipe 2 is provided with a weir 5 and a water outlet 4. The water distribution tank 6 is connected to the outlet end of the water outlet 4. The denitrification filter body 1 is provided with a filter media layer. The filter media layer is provided with a filter plate 10, a support layer 9, and a filter media layer 8 from bottom to top. A filter head 11 is provided below the filter plate 10. The filter plate 10 is a precast concrete filter plate, and the filter head 11 is a 290mm ABS filter head. There is a filter media feeding device above the filter media layer. The filter media feeding device is located above the denitrification filter body. The filter media feeding device includes a filter media storage pipe 15 and a screw conveyor 16. The discharge end of the screw conveyor 16 is connected to the top of the filter media layer through at least one feeding pipe. A drainage pipe 13 is installed at the lower part of the main body 1 of the denitrification filter tank. A backwash water inlet pipe 14 is connected to the drainage pipe 13. A backwash sewage discharge pipe is installed on one side of the main body 1 of the denitrification filter tank. A backwash air inlet pipe 12 is installed on one side of the main body 1 of the denitrification filter tank.

[0026] In this embodiment, the biochemically treated wastewater flows by gravity from the high-efficiency sedimentation tank to the sulfur autotrophic filter. It then enters the water distribution area 5 of the filter via the inlet pipe 2. The water flows through the weir 3 and the outlet 4 into the distribution tank 6, where it is evenly distributed into multiple distribution pipes. The filter's water distribution system distributes water from the top, allowing it to descend and fully contact the filter media for sulfur autotrophic denitrification. After sufficient reaction, the water flows to the bottom of the filter, passes through the filter head 11 at the bottom, and is discharged from the tank through the filter drain pipe 13. Simultaneously, the height of the filter media is monitored by instruments. When the media loss exceeds 2cm, a screw conveyor is manually or automatically activated to replenish the media. The media is added to fixed points via the screw conveyor. To ensure the media is evenly distributed throughout the filter, intermittent, multiple additions are made to ensure adequate coverage.

[0027] The filter needs to be backwashed during operation. Backwashing includes air washing, combined air and water washing, water washing, and nitrogen removal. The filter is removed from nitrogen 1-4 times a day, and backwashing is performed according to the suspended solids (SS) of the influent.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims. Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sulfur autotrophic denitrification filter, comprising a denitrification filter body (1), characterized in that, The denitrification filter body (1) is provided with a water distribution area (5), the water distribution area (5) is provided with a water distribution device, the water distribution device is connected to a water inlet device, the denitrification filter body (1) is provided with a filter media layer, the filter media layer is provided with a filter media dosing device above it, and the denitrification filter body (1) is provided with a drainage pipe (13) at the bottom. The water distribution device includes a water distribution tank (6) connected to the water inlet device. The water distribution tank (6) has a water distribution pipe (7) on at least one side, and the water distribution pipe (7) has a water distribution hole.

2. The sulfur autotrophic denitrification filter according to claim 1, characterized in that, The water inlet device includes a water inlet pipe (2), and a weir (3) and a water outlet (4) are provided at the rear end of the water inlet pipe (2). The water distribution tank (6) is connected to the outlet end of the water outlet (4).

3. The sulfur autotrophic denitrification filter according to claim 1, characterized in that, Two sets of water distribution devices are installed in the water distribution area (5).

4. A sulfur autotrophic denitrification filter according to claim 1 or 3, characterized in that, Water distribution pipes (7) are provided on both sides of the water distribution tank (6), and multiple rows of water distribution pipes (7) are provided on each side.

5. A sulfur autotrophic denitrification filter according to claim 1, characterized in that, The filter media layer consists of a filter plate (10), a support layer (9), and a filter media layer (8) arranged from bottom to top, and a filter head (11) is arranged below the filter plate (10).

6. A sulfur autotrophic denitrification filter according to claim 5, characterized in that, The filter plate (10) is a precast concrete filter plate, and the filter head (11) is a 290mm ABS filter head.

7. A sulfur autotrophic denitrification filter according to claim 1, characterized in that, The filter media feeding device is located above the main body of the denitrification filter. The filter media feeding device includes a filter media storage pipe (15) and a screw conveyor (16). The discharge end of the screw conveyor (16) is connected to the top of the filter media layer through at least one feeding pipe.

8. A sulfur autotrophic denitrification filter according to claim 1, characterized in that, The drainage pipe (13) is connected to a backwash inlet pipe (14), and a backwash discharge pipe is provided on one side of the main body (1) of the denitrification filter.

9. A sulfur autotrophic denitrification filter according to claim 1, characterized in that, A backwash air inlet pipe (12) is provided on one side of the main body (1) of the denitrification filter.

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