Downward flow type sulfur autotrophic denitrification deep bed filter system

Abstract

The utility model discloses a down-flow sulfur autotrophic denitrification deep bed filter system which comprises a skid-mounted base and a filter tank body mounted on the skid-mounted base, the filter tank body is provided with a water inlet, a water production port and a gas outlet, and a filter brick layer, a supporting layer and a sulfur autotrophic filler layer are sequentially arranged in the filter tank body from bottom to top. A water collecting tank communicated with the water producing port is formed between the filter brick layer and the inner bottom wall of the filter tank body, and the gas outlet is connected with a deodorization device for removing hydrogen sulfide. A liquid carbon source does not need to be additionally added, the workload of workers is reduced, labor is saved, and the whole device is easy to install, short in installation period and suitable for small-treatment-scale sewage plants.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a downflow type sulfur autotrophic denitrification deep bed filter system. Background Technology

[0002] In the advanced treatment of municipal wastewater, traditional reinforced concrete denitrification deep-bed filters are often used for total nitrogen removal. These filters are integrated treatment units combining biological nitrogen removal and filtration, representing a unique and advanced treatment process that combines both. The deep-bed filter uses specially sized and shaped quartz sand as the biofilm medium for denitrifying organisms. Simultaneously, the deep bed acts as an excellent reactor for removing nitrate nitrogen (NO3-N) and suspended solids (SS). During filtration, a liquid carbon source is added, and nitrate nitrogen is converted into nitrogen gas through the action of the microbial biofilm and discharged. The continuous retention of suspended solids increases head loss, thus requiring backwashing to remove the retained solids. Ultimately, the structure achieves the functions of nitrogen removal, phosphorus removal, and suspended solids removal. Its disadvantages are that excessive carbon source addition will cause the effluent COD to exceed the standard, the backwashing frequency is about 2 days / time, the sludge production is high, and the liquid carbon source needs to be replenished frequently, about once a week, which will result in a heavy workload for workers; furthermore, in actual application, the deep bed filter with reinforced concrete structure is complicated to install and has a long installation cycle, making it unsuitable for small-scale sewage treatment plants. Utility Model Content

[0003] The purpose of this invention is to provide a downflow type sulfur autotrophic denitrification deep bed filter system that does not require additional liquid carbon source, reduces the workload of workers, saves labor, and the entire device is simple to install with a short installation period, making it suitable for small-scale wastewater treatment plants.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0005] A downflow type sulfur autotrophic denitrification deep bed filter system includes a skid-mounted base and a filter tank installed on the skid-mounted base. The filter tank is provided with an inlet, a product water outlet, and an outlet. The filter tank is provided with a filter brick layer, a support layer, and a sulfur autotrophic packing layer from bottom to top. A water collection trough connected to the product water outlet is formed between the filter brick layer and the bottom wall of the filter tank. The outlet is connected to a deodorization device for removing hydrogen sulfide.

[0006] This solution utilizes a skid-mounted base, facilitating easy and quick installation. The steel structure allows for the welding of small-sized cylinders, making it suitable for small-scale wastewater treatment plants. Primarily employing heterotrophic denitrification, it eliminates the need for additional liquid carbon sources. Using a solid sulfur-autotrophic packing layer as the donor and inorganic carbon as the carbon source, denitrification is achieved. The H₂ produced in this process... +The hydrogen sulfide gas generated by the neutralization of the alkaline material in the solid sulfur self-nourishing packing layer is collected and adsorbed and degraded by the deodorization device through the pipeline, thus avoiding the problem of air pollution caused by hydrogen sulfide. At the same time, the use of solid sulfur self-nourishing packing allows for long addition intervals, about once a year, which greatly reduces the workload and saves manpower.

[0007] Optionally, the deodorization device includes a deodorization tank, which is located on the side of the skid-mounted base. The air inlet of the deodorization tank is connected to the air outlet pipe of the filter tank. An exhaust port is provided on the side wall of the deodorization tank. The deodorization tank is equipped with a spirally distributed reaction tube inside, which is connected to the air inlet. The reaction tube is filled with activated carbon.

[0008] Optionally, the deodorizing tank is provided with a liquid storage chamber located below the reaction tube, the liquid storage chamber contains an alkaline solution, the lower end of the reaction tube is submerged below the surface of the alkaline solution, the exhaust port is above the surface of the alkaline solution, and an exhaust valve is provided at the exhaust port.

[0009] Optionally, the skid-mounted base is made of carbon steel, and multiple filter tanks are distributed along the length of the skid-mounted base, with adjacent filter tanks being staggered.

[0010] Optionally, the water inlet is connected to a main water inlet pipe, and a water inlet valve is provided on the water path connecting the water inlet and the main water inlet pipe. The water outlet is connected to a water outlet valve, and the water outlet valve is connected to a main water outlet pipe. The main water outlet pipe is connected to a water outlet riser, and a breather valve is provided at the upper end of the water outlet riser. A water outlet flange is provided on the side wall of the water outlet riser.

[0011] Optionally, the water collection tank is connected to a backwash water tank located on the side of the skid-mounted base. A backwash water valve is provided on the pipeline connecting the backwash water tank and the water collection tank. A backwash water pump is provided on the pipeline connecting the backwash water valve and the backwash water tank. The backwash water pump and the backwash water valve are connected by a backwash water pipe.

[0012] Optionally, the water collection tank is also connected to a fan located on the skid-mounted base. The fan and the water collection tank are connected through a backwashing air pipe, and a backwashing air valve is provided on the backwashing air pipe.

[0013] Optionally, the filter tank has a backwash drain port located above the sulfur autotrophic packing layer on its side wall. The backwash drain port is connected to a backwash drain pipe, and the backwash drain pipe is equipped with a backwash drain valve.

[0014] Optionally, the skid-mounted base is also equipped with a PLC control cabinet and an air compressor.

[0015] Optionally, the support layer is composed of pebbles of different sizes, the filter brick layer is composed of ceramic composite filter bricks, the filter tank is cylindrical, and the inner wall of the filter tank is made of fiberglass.

[0016] The beneficial effects of this utility model are:

[0017] 1. This utility model uses a skid-mounted base, which is convenient to install and has a short installation cycle. Simultaneously, the steel structure allows for the welding of small-sized cylinders, making it suitable for small-scale wastewater treatment plants. It primarily uses heterotrophic denitrification, eliminating the need for additional liquid carbon sources. A solid sulfur-autotrophic packing layer serves as the donor, utilizing inorganic carbon as the carbon source for denitrification. The H2 produced in this process... + The hydrogen sulfide gas generated by the neutralization of the alkaline material in the solid sulfur self-nourishing packing layer is collected and adsorbed and degraded by the deodorization device through the pipeline, thus avoiding the problem of air pollution caused by hydrogen sulfide. At the same time, the use of solid sulfur self-nourishing packing allows for long addition intervals, about once a year, which greatly reduces the workload and saves manpower. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a structural schematic diagram of this utility model from another angle;

[0020] Figure 3 This is a schematic diagram of the internal structure of the filter tank;

[0021] Figure 4 This is a diagram of the internal structure of the deodorizing tank.

[0022] Attached reference numerals: 1-Inlet main pipe, 2-Inlet valve, 3-Backwash water valve, 4-Backwash water tank, 5-Deodorization device, 501-Deodorization tank, 502-Reaction pipe, 503-Storage chamber, 504-Exhaust port, 505-Exhaust valve, 6-Fan, 7-PLC control cabinet, 8-Skid-mounted base, 9-Enclosure, 10-Filter tank body, 11-Backwash drain valve, 12-Backwash air valve, 13-Product water valve, 14-Level gauge, 15-Breathing valve, 16-Outlet riser, 17-Sulfur self-growth packing layer, 18-Support layer, 19-Filter brick layer, 20-Collection tank, 21-Outlet main pipe, 22-Backwash water pump, 23-Air compressor, 24-Backwash air duct, 25-Outlet flange, 26-Backwash water pipe, 27-Backwash drain port, 28-Backwash drain pipe. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0024] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example

[0027] A downflow type sulfur autotrophic denitrification deep bed filter system includes a skid-mounted base 8 and a filter tank 10 installed on the skid-mounted base 8. The filter tank 10 is provided with an inlet, a product water outlet, and an outlet. Inside the filter tank 10, from bottom to top, there are filter brick layers 19, a support layer 18, and a sulfur autotrophic packing layer 17. A water collection trough 20 connected to the product water outlet is formed between the filter brick layer 19 and the bottom wall of the filter tank 10. The outlet is connected to a deodorization device 5 for removing hydrogen sulfide.

[0028] In this embodiment, as Figure 1 and Figure 2As shown, a skid-mounted base 8 is used, which is convenient to install and has a short installation cycle. The cylindrical steel structure allows for welding of small-sized cylinders, making it suitable for small-scale wastewater treatment plants. The inner wall of the filter tank 10 is made of fiberglass for corrosion protection. It primarily uses heterotrophic denitrification, eliminating the need for additional liquid carbon sources. Solid sulfur autotrophic packing layer 17 serves as the donor, utilizing inorganic carbon as the carbon source for denitrification. The H+ ions generated during this process are neutralized by the alkaline materials in the solid sulfur autotrophic packing layer 17. The generated hydrogen sulfide gas is collected and adsorbed by the deodorization device 5 through a pipeline, preventing air pollution caused by hydrogen sulfide. Furthermore, the use of solid sulfur autotrophic packing allows for long addition intervals, approximately once a year, significantly reducing workload and saving labor. Suitable for small-scale wastewater treatment plants (less than 10,000 m3 / d), this skid-mounted downflow sulfur autotrophic denitrification deep bed filter system has a short production cycle, low construction cost, and convenient transportation and installation. It can greatly save labor and construction costs of civil engineering tanks. It uses sulfur autotrophic solid filler, which does not require additional liquid carbon source, and there is no situation where the COD of the effluent does not meet the standards due to excessive carbon source addition.

[0029] Furthermore, the deodorization device 5 includes a deodorization tank 501, which is disposed on the side of the skid-mounted base 8. The air inlet of the deodorization tank 501 is connected to the air outlet pipe of the filter tank 10. An exhaust port 504 is provided on the side wall of the deodorization tank 501. The deodorization tank 501 is provided with a spirally distributed reaction tube 502 inside, which is connected to the air inlet. The reaction tube 502 is filled with activated carbon.

[0030] Furthermore, the deodorizing tank 501 is provided with a liquid storage chamber 503 located below the reaction tube 502. The liquid storage chamber 503 contains an alkaline solution. The lower end of the reaction tube 502 is submerged below the surface of the alkaline solution. The exhaust port 504 is higher than the surface of the alkaline solution. An exhaust valve 505 is provided at the exhaust port 504.

[0031] Specifically, such as Figure 4As shown, the air inlet of the deodorizing tank 501 is connected to the air outlet of the filter tank 10 via a pipeline. This allows the gas treated in the filter tank 10 to enter the deodorizing tank 501 for further treatment. An exhaust port 504 is provided on the side wall of the deodorizing tank 501 to discharge the deodorized gas. Deodorization primarily removes hydrogen sulfide gas, and the discharged gas is nitrogen. The deodorizing tank 501 contains spirally distributed reaction tubes 502. This design increases the contact time and area between the gas and the filling material inside the reaction tubes 502, thereby improving deodorization efficiency. The reaction tubes 502 are connected to the air inlet to ensure smooth gas entry. The reaction tubes 502 are filled with activated carbon. Due to its porous structure, activated carbon has a strong adsorption capacity, which can adsorb and remove odorous substances from the gas. Inside the deodorizing tank 501, a storage chamber 503 is provided below the reaction tube 502 for storing an alkaline solution (sodium hydroxide or calcium hydroxide solution). The alkaline solution can further neutralize the hydrogen sulfide in the gas and further purify the gas. The lower end of the reaction tube 502 is submerged below the surface of the alkaline solution to ensure that the gas can fully contact the alkaline solution when passing through the reaction tube 502. The exhaust port 504 and the exhaust valve 505 are as follows: the exhaust port 504 is set above the surface of the alkaline solution to prevent the alkaline solution from splashing into the exhaust port 504. The exhaust valve 505 is provided at the exhaust port 504 to control the gas emission rate and time.

[0032] Working principle: When odorous gas flows out of the filter tank 10 and enters the deodorization tank 501, it first passes through the spirally distributed reaction tube 502. Inside the reaction tube 502, activated carbon adsorbs and removes hydrogen sulfide from the gas. Simultaneously, as the gas passes through the lower end of the reaction tube 502, it comes into contact with an alkaline solution, further neutralizing the hydrogen sulfide. After this series of treatments, the nitrogen becomes purer and is then discharged into the atmosphere through the exhaust port 504 and the exhaust valve 505.

[0033] Furthermore, the skid-mounted base 8 is made of carbon steel, and multiple filter tanks 10 are distributed along the length of the skid-mounted base 8, with adjacent filter tanks 10 being staggered.

[0034] Specifically, multiple filter tanks 10 are distributed along the length of the skid-mounted base 8. This layout makes full use of the space of the skid-mounted base 8, facilitates management and maintenance, and the multiple filter tanks 10 can also improve treatment efficiency and meet the needs of larger-scale gas treatment. Adjacent filter tanks 10 are staggered, which not only optimizes space utilization but also greatly reduces the area required for the skid-mounted base 8, reducing the overall size of the device and thus reducing the floor space occupied, making it more suitable for small-scale wastewater treatment plants.

[0035] Furthermore, the water inlet is connected to a main water inlet pipe 1, and a water inlet valve is provided on the water path connecting the water inlet and the main water inlet pipe 1. A water production valve 13 is connected to the water production outlet, and a water outlet main pipe 21 is connected to the water outlet end of the water production valve 13. A water outlet riser 16 is connected to the water outlet riser 16, and a breather valve 15 is provided at the upper end of the water outlet riser 16. A water outlet flange 25 is provided on the side wall of the water outlet riser 16.

[0036] Furthermore, the water collection tank 20 is connected to a backwash water tank 4 located on the side of the skid-mounted base 8. A backwash water valve 3 is provided on the pipeline connecting the backwash water tank 4 and the water collection tank 20. A backwash water pump 22 is provided on the pipeline connecting the backwash water valve 3 and the backwash water tank 4. The backwash water pump 22 and the backwash water valve 3 are connected by a backwash water pipe 26.

[0037] Furthermore, the water collection tank 20 is also connected to a fan 6 located on the skid-mounted base 8. The fan 6 and the water collection tank 20 are connected through a backwashing air pipe 24, and a backwashing air valve 12 is provided on the backwashing air pipe 24.

[0038] Furthermore, the filter tank 10 has a backwash drain port 27 located above the sulfur self-growth packing layer 17 on its side wall. The backwash drain port 27 is connected to a backwash drain pipe 28, and a backwash drain valve 11 is provided on the backwash drain pipe 28.

[0039] Furthermore, the skid-mounted base 8 is also equipped with a PLC control cabinet 7 and an air compressor 23.

[0040] Furthermore, the support layer 18 is composed of pebbles of different particle sizes, the filter brick layer 19 is composed of ceramic composite filter bricks, the filter tank 10 is cylindrical, and the inner wall of the filter tank 10 is made of fiberglass.

[0041] The working principle of this utility model is as follows: Wastewater is evenly distributed to each circular filter tank 10 through the inlet main pipe 1 and the inlet valve, such as... Figure 3As shown, wastewater passes through the sulfur autotrophic packing layer 17 from above. The packing layer can be filled to a height of 1.5 to 2.5 meters. It reacts with the autotrophic microorganisms in the tank and on the attached packing layer to degrade nitrate nitrogen into nitrogen gas and hydrogen sulfide gas. The gas is collected by the deodorization device 5 through the pipeline and then adsorbed and degraded, leaving only clean nitrogen gas in the atmosphere. The wastewater passes downward through the support layer 18 to prevent leakage of the sulfur autotrophic packing layer 17, and then through the outflow gap of the filter brick layer 19 to the water collection tank 20. During normal filtration, the water production valve 13 is opened, and the water is produced to the main water outlet 21 and then to the water outlet riser 16. The air in the pipeline is released through the breather valve 15. Part of the water flows out to the backwash water tank 4, and part of the water is directly discharged to the discharge point through the water outlet flange 25. During operation, the filter tank 10 needs to be backwashed periodically, or the liquid level in the filter tank 10 needs to be monitored by the level gauge 14. Backwashing is performed when the liquid level is high. The backwashing process begins with an air wash stage: the inlet valve and product water valve 13 are closed, the backwash air valve 12 and backwash drain valve 28 are opened, and the blower 6 is turned on for 5 minutes of air washing. Next, a water-air backwash stage is performed: the backwash water valve 3 is opened, and the backwash water pump 22 is turned on. The backwash water pump 22 draws water from the backwash water tank 4 to the collection tank 20, and then distributes water and air through the filter brick layer 19 for 8 minutes of mixed air-water backwashing. Finally, a water wash stage is performed: the blower 6 is turned off, then the backwash air valve 12 is closed. After 7 minutes of water washing, the backwash pump is turned off, then the backwash water valve 3 is closed. The backwashing process ends at this point. The inlet valve and product water valve 13 are then reopened for normal filtration. Throughout the entire operation, the air compressor 23 needs to supply air to various start valves, and the control and action of each piece of equipment requires the PLC control cabinet 7 to control and provide feedback.

[0042] This invention primarily utilizes heterotrophic denitrification, eliminating the need for additional liquid carbon sources. It employs solid sulfur autotrophic packing as the donor and inorganic carbon as the carbon source for denitrification. The H+ ions generated during this process are neutralized by the alkaline material in the solid sulfur autotrophic packing layer 17, while the generated H2S gas is collected and adsorbed / degraded by the deodorization device 5 through a pipeline. This solves the problem of hydrogen sulfide air pollution. Furthermore, the use of solid sulfur autotrophic packing reduces the addition interval to approximately once a year, significantly reducing workload and saving labor. The circular filter tank 10 offers better structural strength than a rectangular structure, and the inner wall is made of fiberglass for corrosion protection, solving the problem of severe corrosion at the gas-liquid interface. The skid-mounted base 8 facilitates easy installation and shortens the installation period, allowing for water supply within just two days. The steel structure allows for the welding of small-sized cylinders, making it suitable for small-scale wastewater treatment plants. The system operates stably, has strong resistance to shock loads, and meets effluent standards, consistently achieving TN < 1 mg / L, demonstrating excellent decontamination performance. Additionally, a fence 9 can be installed on the top of the filter tank 10 to facilitate maintenance and ensure worker safety.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A downflow type sulfur autotrophic denitrification deep bed filter system, comprising a skid-mounted base (8) and a filter tank (10) mounted on the skid-mounted base (8), characterized in that, The filter tank (10) is provided with an inlet, a product water outlet and an outlet. The filter tank (10) is provided with a filter brick layer (19), a support layer (18) and a sulfur self-nourishing packing layer (17) from bottom to top. A water collection trough (20) connected to the product water outlet is formed between the filter brick layer (19) and the bottom wall of the filter tank (10). The outlet is connected to a deodorizing device (5) for removing hydrogen sulfide.

2. The downflow type autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The deodorization device (5) includes a deodorization tank (501), which is located on the side of the skid-mounted base (8). The air inlet of the deodorization tank (501) is connected to the air outlet pipe of the filter tank (10). An exhaust port (504) is provided on the side wall of the deodorization tank (501). A spirally distributed reaction tube (502) is provided inside the deodorization tank (501). The reaction tube (502) is connected to the air inlet and is filled with activated carbon.

3. The downflow type autotrophic denitrification deep bed filter system according to claim 2, characterized in that, The deodorizing tank (501) is provided with a liquid storage chamber (503) located below the reaction tube (502). The liquid storage chamber (503) contains an alkaline solution. The lower end of the reaction tube (502) is submerged below the surface of the alkaline solution. The exhaust port (504) is higher than the surface of the alkaline solution. An exhaust valve (505) is provided at the exhaust port (504).

4. The downflow autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The skid-mounted base (8) is made of carbon steel. Multiple filter tanks (10) are distributed along the length of the skid-mounted base (8), and adjacent filter tanks (10) are staggered.

5. A downflow type autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The inlet is connected to the main water inlet (1), and an inlet valve is provided on the water path connecting the inlet and the main water inlet (1). The outlet is connected to the water production valve (13), and the outlet end of the water production valve (13) is connected to the outlet main pipe (21). The outlet main pipe (21) is connected to the outlet riser (16). A breather valve (15) is provided at the upper end of the outlet riser (16), and an outlet flange (25) is provided on the side wall of the outlet riser (16).

6. A downflow type autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The water collection tank (20) is connected to a backwash water tank (4) located on the side of the skid-mounted base (8). A backwash water valve (3) is provided on the pipeline connecting the backwash water tank (4) and the water collection tank (20). A backwash water pump (22) is provided on the pipeline connecting the backwash water valve (3) and the backwash water tank (4). The backwash water pump (22) and the backwash water valve (3) are connected through a backwash water pipe (26).

7. A downflow type autotrophic denitrification deep bed filter system according to claim 6, characterized in that, The water collection tank (20) is also connected to a fan (6) located on the skid base (8). The fan (6) and the water collection tank (20) are connected through a backwashing air pipe (24), and a backwashing air valve (12) is provided on the backwashing air pipe (24).

8. A downflow type autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The filter tank (10) has a backwash drain port (27) located above the sulfur self-nourishing packing layer (17) on its side wall. The backwash drain port (27) is connected to a backwash drain pipe (28), and a backwash drain valve (11) is provided on the backwash drain pipe (28).

9. A downflow type autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The skid-mounted base (8) is also equipped with a PLC control cabinet (7) and an air compressor (23).

10. A downflow type sulfur autotrophic denitrification deep bed filter system according to claim 1, characterized in that, The support layer (18) is composed of pebbles of different sizes, the filter brick layer (19) is composed of ceramic composite filter bricks, the filter tank (10) is cylindrical, and the inner wall of the filter tank (10) is made of fiberglass.

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