A sulfur autotrophic denitrification fluidized bed system
By using sulfur-based powdered packing material mixed with activated sludge in a denitrification fluidized bed system, combined with an inclined plate filter structure, the problem of insufficient carbon source in traditional wastewater denitrification is solved, achieving efficient denitrification and reducing activated sludge production.
Patent Information
- Application Number
- CN202520991788.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2026-06-23
- Estimated Expiration
- 2035-05-20
AI Technical Summary
In traditional wastewater denitrification processes, insufficient carbon sources lead to the growth and reproduction of microorganisms, increasing the production of activated sludge, creating a burden on subsequent treatment, and requiring the addition of external carbon sources.
A denitrification fluidized bed system is designed, which uses sulfur-based powder packing material mixed with activated sludge to remove nitrate nitrogen and nitrite nitrogen from wastewater through a stirring mechanism, avoiding the need for external carbon sources, and setting up an inclined plate filter structure for solid particle sedimentation and recycling of the precipitate.
It achieves efficient removal of nitrate and nitrite nitrogen from wastewater without the need for an external carbon source, avoids the increase of activated sludge, improves treatment efficiency, and reduces the burden of subsequent treatment.
Smart Images
Figure CN224394721U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a sulfur autotrophic denitrification fluidized bed system, and pertains to the field of wastewater treatment technology. Background Technology
[0002] With the increasing severity of nitrogen pollution in water bodies, nitrogen pollution has become a significant factor affecting the ecological balance of aquatic bodies. Traditional wastewater denitrification methods typically convert nitrogen in various forms into nitrate nitrogen, which is then metabolized by microorganisms under anaerobic conditions using organic matter as a carbon source (such as glucose, sodium acetate, and methanol) to achieve denitrification. However, during the denitrification process, the wastewater lacks sufficient carbon sources and has poor biodegradability, necessitating the addition of external carbon sources to compensate for this deficiency. However, external carbon source addition can promote the growth and reproduction of microorganisms in activated sludge, increasing the production of activated sludge in the wastewater and burdening subsequent treatment processes. Utility Model Content
[0003] The purpose of this invention is to design a denitrification fluidized bed system that can avoid increasing the production of activated sludge during the wastewater denitrification process.
[0004] This utility model includes a denitrification fluidized bed with a first inlet and a first outlet. The denitrification fluidized bed includes a fluidization chamber and a flocculation chamber separated by a partition. The lower parts of the fluidization chamber and the flocculation chamber are connected. The fluidization chamber and the flocculation chamber are respectively equipped with a stirring mechanism. The upper part of the fluidization chamber has a first inlet and a first dosing pipe that communicate with its inner cavity. The upper part of the flocculation chamber has a first outlet and a second dosing pipe. The first dosing pipe is located on the side adjacent to the first inlet, the second dosing pipe is located on the side adjacent to the partition, and the first outlet is located on the side away from it. A first filtration mechanism covering its entire cross-section is provided on the upper part of the flocculation chamber and below the first outlet. The second dosing pipe passes through the lower part of the first filtration mechanism.
[0005] Furthermore, it includes a sedimentation tank with a second inlet and a second outlet at the top, the second inlet being connected to the first outlet via an outlet pipe, and a second reflux port for the sediment being provided at the lower end of the sedimentation tank; a first reflux port is provided on the wall of the fluidization chamber below the first inlet, and the first reflux port and the second reflux port are connected via a reflux pipe.
[0006] Furthermore, the lower part of the sedimentation tank is conical and has a ceramic layer, and the lower end of the second water inlet pipe connected to the second water inlet is not higher than the upper end of the ceramic layer.
[0007] Furthermore, the diameter of the second inlet pipe of the sedimentation tank is larger than the diameter of the outlet pipe and the diameter of the second return port. The upper end of the second inlet pipe is configured as a funnel-shaped interface, and the end of the outlet pipe is connected to the funnel-shaped interface.
[0008] Furthermore, a second filtration mechanism is installed in the sedimentation tank between the lower port of the second inlet pipe and the second outlet.
[0009] Furthermore, the first or second filtration mechanism is an inclined plate filtration structure.
[0010] In this invention, a sulfur-based powder packing layer is installed at the bottom of the fluidization chamber and flocculation chamber. After activated sludge is added to the first dosing pipe, the packing, activated sludge, and wastewater are mixed by a stirring mechanism. This removes nitrate and nitrite nitrogen from the wastewater, completing the denitrification treatment without requiring an external carbon source and without increasing the production of activated sludge. The chemical formula for denitrification of wastewater using the sulfur-based powder packing is: 55S + 50NO3. - + 38H2O + 4NH4 + → 4C5H7O2N + 25N2 + 55SO4 2- + 64H + .
[0011] In this invention, the sedimentation tank is connected to the denitrification and sulfidation tank via a return pipe. The return pump can carry the activated sludge and other sediments from the sedimentation tank to the denitrification and sulfidation tank for recycling, eliminating the need for subsequent sludge treatment.
[0012] The first and second filtration mechanisms in this invention adopt an inclined plate filtration structure, which utilizes the principle of gravity sedimentation. After the water enters the inclined plate filtration structure, the solid particles in the water will settle to the plate surface and slide down the plate surface, ensuring clear water and improving the water treatment effect. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;
[0014] Figure 2 for Figure 1 Front view of the denitrification fluidized bed;
[0015] Figure 3 for Figure 1 Top view of the denitrification fluidized bed;
[0016] Figure 4 for Figure 1 Full sectional view of the intermediate sedimentation tank;
[0017] Figure 5 for Figure 1 Top view of the intermediate sedimentation tank;
[0018] The components are as follows: 1. Equalization tank; 2. First inlet pipe; 3. Inlet pump; 4. Denitrification fluidized tank; 5. First inlet; 6. First outlet; 7. Baffle; 8. Fluidization chamber; 9. Flocculation chamber; 10. Sulfur-based powder packing layer; 11. Stirring mechanism; 12. First dosing pipe; 13. Second dosing pipe; 14. First filtration mechanism; 15. Outlet pipe; 16. Sedimentation tank; 17. Second inlet; 18. Second inlet pipe; 19. Second outlet; 20. First reflux port; 21. Second reflux port; 22. Reflux pipe; 23. Reflux pump; 24. Ceramic layer; 25. Second filtration mechanism. Detailed Implementation
[0019] by Figure 1 Define the up, down, left, right, front, and back directions in this embodiment.
[0020] As shown in the figure, this embodiment includes an equalization tank 1 for receiving wastewater to be treated and adjusting the wastewater volume and water quality indicators within the tank. A denitrification fluidized bed 4 is located on the right side of the equalization tank 1. A baffle 7 is installed inside the denitrification fluidized bed 4, and the baffle 7 is fixedly connected to the upper surface of the inner wall of the denitrification fluidized bed 4. A fluidization chamber 8 is located to the left of the baffle 7, and a flocculation chamber 9 is located to the right. The lower parts of the fluidization chamber 8 and the flocculation chamber 9 are connected. A sulfur-based powder packing layer 10 is installed at the lower part of the fluidization chamber 8 and the flocculation chamber 9. During use, the sulfur-based powder packing, activated sludge, and wastewater are mixed to remove nitrate nitrogen and nitrite nitrogen from the wastewater, thus performing denitrification treatment on the water body. A first inlet 5, communicating with the inner cavity of the fluidization chamber 8, is located on the upper left side. The first inlet 5 is connected to the equalization tank 1 via a first inlet pipe 2. An inlet pump 3 is installed on the first inlet pipe 2. During use, starting the inlet pump 3 allows wastewater to be pumped into the denitrification fluidized bed 4. A first dosing pipe 12, communicating with the inner cavity of the fluidization chamber 8, is located on the side adjacent to the first inlet 5. Its function is to add activated sludge and supplement sulfur-based powder filler into the fluidization chamber 8. A first outlet 6 and a second dosing pipe 13 are located on the upper part of the flocculation chamber 9. Both the first outlet 6 and the second dosing pipe 13 communicate with the inner cavity of the flocculation tank 9. The second dosing pipe 13 is located on the left side near the partition 7 and is used to add flocculant to the flocculation tank 9, enabling the sulfur-based powder filler to settle. The first outlet 6 is located on the right end of the flocculation tank 9, away from the partition 7. A stirring mechanism 11 is installed in both the fluidization chamber 8 and the flocculation chamber 9. The stirring mechanism 11 includes a motor located at the upper end of the denitrification fluidization tank, with the motor positioned between the fluidization chamber 8 and the flocculation chamber 9. The shafts of each motor extend into the inner cavities of the fluidization chamber 8 and the flocculation chamber 9, and left-right extending stirring rollers are installed at the lower part of the shafts. A first filtration mechanism 14 is provided on the upper part of the flocculation tank 9, covering the entire cross-section of the flocculation tank 9. In this embodiment, the lower opening of the second dosing pipe 13 extends below the first filtration mechanism 14, which can prevent the added flocculant from being blocked by the first filtration mechanism 14.
[0021] A sedimentation tank 16 with a conical lower part is provided on the right side of the denitrification fluidized bed 4. A second inlet 17 is provided on the upper part of the sedimentation tank 16. The second inlet 17 is connected to the first outlet 6 through an outlet pipe 15. A second inlet pipe 18 is provided on the second inlet 17. The upper end of the second inlet pipe 18 is set as a funnel-shaped interface. The end of the outlet pipe 15 is connected to the funnel-shaped interface, so that the water flow delivered by the outlet pipe 15 can be received into the second inlet pipe 18 through the funnel-shaped structure. A second return port 21 is provided at the lower part of the sedimentation tank 16, and a first return port 20 is provided on the fluidized bed wall below the first inlet 5. The first return port 20 and the second return port 21 are connected by a return pipe 22 on which a return pump 23 is installed. In use, the return pump 23 is started, and the activated sludge, sulfur-based powder, and other precipitates in the sedimentation tank 16 can be transported to the denitrification fluidized bed 4 for recycling through the return pipe 22. The pumping speed of the return pump 23 is lower than the water delivery speed of the outlet pipe 15, which can ensure that water accumulates in the sedimentation tank 16 while extracting precipitates. A ceramic layer 24 is provided on the conical inner wall at the lower part of the sedimentation tank 16. The ceramic layer 24 is fixedly connected to the inner wall of the sedimentation tank 16 to prevent precipitates from adhering to the sedimentation tank 16. In this embodiment, the lower end of the second inlet pipe 18 is not higher than the upper end of the ceramic layer 24 to prevent precipitates in the water from contacting the inner wall of the sedimentation tank 16. The diameter of the second inlet pipe 18 is larger than that of the outlet pipe 15 and the second return port 21. After the water flows through the outlet pipe 15 into the second inlet pipe 18, it is slowed down by the inner wall of the second inlet pipe 18, which facilitates the sedimentation of solid particles in the water. A second outlet 19 is provided on the upper right side of the sedimentation tank 16, and the water accumulated in the sedimentation tank 16 flows out naturally from the second outlet 19. A second filter mechanism 25 is provided between the lower end of the second inlet pipe 18 and the second outlet 19, which can further separate the sediment in the sedimentation tank 16.
[0022] In this embodiment, the first filtration mechanism 14 and the second filtration mechanism 25 are inclined plate filtration mechanisms. They can utilize the principle of gravity sedimentation. After the water enters the inclined plate filtration structure, the solid particles in the water will settle to the plate surface and slide down along the plate surface, ensuring clear effluent and improving the water treatment effect.
[0023] In this embodiment, wastewater is first transported to equalization tank 1, where the wastewater volume and quality indicators are adjusted. Then, influent pump 3 is started to continuously transport the wastewater from equalization tank 1 to denitrification fluidized bed 4. Activated sludge is added to fluidization chamber 8 through first dosing pipe 12. Then, the motors of each stirring mechanism 11 are started to control the rotation of the stirring rollers to mix the wastewater, activated sludge, and sulfur-based powder filler, thus performing denitrification treatment on the wastewater. During the denitrification process, sulfur-based powder filler can be added through first dosing pipe 12. During the denitrification process, flocculant is added to the flocculation chamber 9 through the second dosing pipe 13. The flocculant mixes with the wastewater in the flocculation chamber 9 through the stirring mechanism 11, causing the sulfur-based powder packing material in the flocculation chamber 9 to settle. As water continues to enter through the first inlet pipe 2, the water level in the denitrification fluidized tank 4 rises slowly. During the rise of the water level in the flocculation chamber 9, the water body separates solid particles such as sulfur-based powder and activated sludge in the water body through the first filtration mechanism 14. After the water level rises to the first outlet 6, the denitrified water body flows naturally into the sedimentation tank 16 through the outlet pipe 15. Start the return pump 23 to transport the sediment in the sedimentation tank 16 to the denitrification fluidized tank 4 for recycling through the return pipe 22; as water continues to enter through the outlet pipe 15, the water level in the sedimentation tank 16 rises slowly. During the rise, the water body passes through the second filtration mechanism 25 to separate and filter the residual solid particles in the water body. After the water level rises to the second outlet 19, the denitrified water body flows out naturally through the second outlet 19.
Claims
1. A sulfur autotrophic denitrification fluidized bed system, comprising a denitrification fluidized bed with a first inlet and a first outlet, characterized in that: The denitrification fluidized bed includes a fluidization chamber and a flocculation chamber separated by a partition. The lower parts of the fluidization chamber and the flocculation chamber are connected. The fluidization chamber and the flocculation chamber are respectively equipped with a stirring mechanism. The upper part of the fluidization chamber has a first inlet and a first dosing pipe that communicate with its inner cavity. The upper part of the flocculation chamber has a first outlet and a second dosing pipe. The first dosing pipe is located on the side adjacent to the first inlet, the second dosing pipe is located on the side adjacent to the partition, and the first outlet is located on the side away from the partition. A first filtration mechanism covering the entire cross-section of the flocculation chamber is provided above the first outlet, and the second dosing pipe is located below the first filtration mechanism.
2. The autotrophic denitrification fluidized bed system according to claim 1, characterized in that: It includes a sedimentation tank with a second inlet and a second outlet at the top. The second inlet is connected to the first outlet through an outlet pipe. A second return port for the sediment is provided at the lower end of the sedimentation tank. A first return port is provided on the wall of the fluidization chamber below the first inlet. The first return port and the second return port are connected through a return pipe.
3. The autotrophic denitrification fluidized bed system according to claim 2, characterized in that: The sedimentation tank has a conical lower part and is provided with a ceramic layer. The lower end of the second water inlet pipe, which is connected to the second water inlet, is not higher than the upper end of the ceramic layer.
4. The autotrophic denitrification fluidized bed system according to claim 2 or 3, characterized in that: The second inlet pipe of the sedimentation tank has a larger diameter than the outlet pipe and the second return port. The upper end of the second inlet pipe is configured as a horn-shaped interface, and the end of the outlet pipe is connected to the horn-shaped interface.
5. The autotrophic denitrification fluidized bed system according to claim 2 or 3, characterized in that: Inside the sedimentation tank, a second filtration mechanism is installed between the lower end of the second inlet pipe and the second outlet.
6. The autotrophic denitrification fluidized bed system according to claim 5, characterized in that: The first or second filtration mechanism is an inclined plate filtration structure.