Advanced sewage treatment system
By setting up a stirring device and denitrification carrier in the sewage depth treatment system, combining sludge reflux and conical sedimentation tank, and using activated carbon carrier, the problems of complex structure and high operating costs of the existing sewage treatment system are solved, and efficient nitrogen is achieved and phosphorus removal meets emission standards.
Patent Information
- Application Number
- CN202421041346.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-13
AI Technical Summary
The existing sewage depth treatment system has a complex structure and high operating cost, making it difficult to effectively remove pollutants such as nitrogen and phosphorus in the water, affecting the quality of the water environment.
Using a three-stage treatment system including activated denitrification tank and coagulation sediment tank, a stirring device and denitrification carrier are set up, the denitrification process is optimized through sludge reflux, reducing the use of add-on agents, and using conical coagulation sediment tank and granular Activated carbon acts as a denitrification carrier to improve the effect of nitrogen removal and phosphorus removal.
The sewage treatment with simple structure and low operating costs is achieved, which significantly improves the denitrification and nitrogen removal effect, reduces the operating cost, and improves the phosphorus removal effect through conical precipitation tanks and activated carbon carriers, meeting the requirements of emission standards.
Smart Images
Figure CN222331728U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a sewage deep treatment system. Background Art
[0002] Eutrophication of water bodies is mainly caused by excessive input of nutrients such as nitrogen and phosphorus into water bodies, which leads to abnormal reproduction of phytoplankton such as algae, consumes a large amount of dissolved oxygen, and then affects the balance of aquatic ecosystems, and even causes the degradation of water body ecological functions. In response to this problem, national and local environmental protection departments have continuously strengthened the control of sewage treatment plant discharge standards to reduce the impact on the water environment. The Class A standard stipulated in the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002) requires that the total nitrogen requirement is ≤15mg / L and the total phosphorus requirement is ≤0.4mg / L. This is the basic discharge requirement for urban sewage treatment facilities.
[0003] In order to meet the above-mentioned discharge requirements, sewage needs to undergo at least three levels of treatment processes (physical, biochemical, and deep treatment) to improve the sewage treatment effect. Usually, the primary treatment is through mechanical treatment; the secondary treatment is biological treatment, and the tertiary treatment is the deep treatment of sewage. In the tertiary treatment of sewage, the denitrification filter plays an important role. The denitrification filter includes a water tank, a filtration system (from top to bottom, including a quartz sand filter layer, a support layer, and filter bricks) and an air-water combined recoil device. It uses denitrifying bacteria attached to the quartz sand filter layer to convert nitrate nitrogen into nitrogen gas to deeply remove nitrogen compounds such as nitrates in the water. Once the filter material in the filtration system accumulates too much solid matter, causing the water flow to be blocked or the filtration effect to decrease, an air-water combined recoil device is used to flush the filtration system from bottom to top with air and water to restore the filtration system's processing capacity. Obviously, the use of the air-water combined recoil device undoubtedly makes the structure of the denitrification filter complicated, and it is also necessary to be equipped with an air compressor or blower and a corresponding control system, which undoubtedly increases the operating cost.
[0004] Therefore, there is an urgent need for a sewage deep treatment system to solve the deficiencies of the existing technical problems. Utility Model Content
[0005] In view of the above problems, the purpose of the utility model is to provide a sewage deep treatment system, which has a simple structure, low operating cost and good denitrification and denitrification effect.
[0006] To achieve the above purpose, the utility model provides a sewage deep treatment system, including three-stage treatment, the three-stage treatment includes an activated denitrification tank and a coagulation sedimentation tank, the activated denitrification tank is provided with a stirring device, a denitrification carrier is placed inside the activated denitrification tank, the front end of the activated denitrification tank is provided with an activated sludge inlet, the rear end of the activated denitrification tank is provided with a first water outlet, the front end of the coagulation sedimentation tank is provided with a first water inlet, a dosing device is also provided at the first water inlet, the bottom of the coagulation sedimentation tank is provided with an activated sludge outlet, the first water outlet is connected to the first water inlet, the activated sludge inlet and the activated sludge outlet are connected by a pipeline, and a sludge reflux pump is provided on the pipeline.
[0007] Compared with the prior art, the utility model sets a stirring device and places a denitrification carrier inside the activated denitrification tank, which maximizes the contact and reaction between sewage and the denitrification carrier, optimizes the denitrification process, and enhances the denitrification effect. At the same time, the activated sludge inlet and the activated sludge outlet are connected by a pipeline, and a sludge return pump is provided on the pipeline, so that after the denitrification carrier is precipitated in the coagulation sedimentation tank, most of the denitrification carrier returns to the activated denitrification tank through the sludge, and only a small amount of denitrification carrier needs to be added in the subsequent sequence, which greatly saves the operating cost. Importantly, the denitrification carrier can enhance the flocculation effect of the coagulation sedimentation tank, which can reduce the amount of medicine added in the dosing device, thereby further reducing the operating cost. In addition, the utility model does not need to filter the water head and the backwashing device, so the structure is simple, thereby further reducing the operating cost.
[0008] Furthermore, the utility model also includes a secondary treatment connected to the tertiary treatment, the secondary treatment includes a secondary sedimentation tank, and the front end of the activated denitrification tank also has a second water inlet, and the second water inlet is connected to the secondary sedimentation tank.
[0009] Furthermore, the secondary treatment of the utility model also includes a biological reaction tank connected to the secondary sedimentation tank.
[0010] Furthermore, the utility model also includes a primary treatment connected to the secondary treatment, and the primary treatment includes a coarse screen, a water inlet pump room, a fine screen, and an aerated grit chamber connected in sequence. The structures and functions of the coarse screen, the water inlet pump room, the fine screen, and the aerated grit chamber are well known to those skilled in the art, so they will not be described in detail here.
[0011] Furthermore, the coagulation sedimentation tank of the utility model is at least one of a horizontal flow sedimentation tank, an inclined tube sedimentation tank or a vertical flow sedimentation tank.
[0012] Furthermore, the activated denitrification pool of the utility model comprises a pool body and a pool tank arranged inside the pool body, the pool body is a cube structure, and the pool tank is a rounded cube structure.
[0013] Furthermore, the activated denitrification pool of the utility model comprises a pool body and a pool tank arranged inside the pool body, and both the pool body and the pool tank are cylindrical structures.
[0014] Furthermore, the dosing device of the utility model comprises a connected dephosphorization agent stirring tank and a flocculant stirring tank, and the dephosphorization agent stirring tank is located between the flocculant stirring tank and the activated denitrification tank. The dephosphorization agent in the dephosphorization agent stirring tank reacts chemically with phosphorus in sewage to form insoluble phosphate precipitates, thereby achieving the purpose of dephosphorization, and the dephosphorization agent stirring tank is arranged before the flocculant stirring tank, which can ensure that the dephosphorization agent and phosphorus in sewage are fully mixed to form precipitates, and then the precipitates are removed in the subsequent flocculant stirring tank.
[0015] Furthermore, the dephosphorization agent stirring box and the flocculant stirring box of the utility model are both provided with a stirrer, which can be but is not limited to a paddle stirrer.
[0016] Furthermore, the denitrification carrier of the utility model uses granular activated carbon as a matrix. The particle size of the activated carbon is 0.15 to 0.3 mm. Activated carbon has the characteristics of high specific surface area, strong adsorption capacity, good microbial adhesion, rich pore structure and renewability, which can significantly improve the denitrification effect and may reduce the amount of carrier used. Specifically, activated carbon has a higher specific surface area in the particle size range of 0.15 to 0.3 mm, which provides a wider attachment space for denitrifying bacteria, helps to increase the amount of microorganisms per unit volume, thereby further improving the denitrification effect.
[0017] Furthermore, the coagulation sedimentation tank of the utility model is a conical structure. The conical structure gradually reduces the bottom area of the coagulation sedimentation tank, forming a natural slope, which helps the activated sludge to concentrate toward the activated sludge outlet at the bottom, facilitating the discharge of the activated sludge. At the same time, the conical structure can guide the water flow to form a stable spiral flow pattern, which helps the suspended particles inside the coagulation sedimentation tank to collide and coagulate, thereby improving the coagulation effect.
[0018] Furthermore, the rear end of the coagulation sedimentation tank of the utility model has a second water outlet, and a total nitrogen monitor for obtaining the total nitrogen concentration of the effluent is provided at the second water outlet. The total nitrogen monitor can monitor the total nitrogen index of the effluent in real time, thereby realizing dynamic control of process parameters.
[0019] Furthermore, the stirring device of the utility model comprises a rotating shaft, one end of which is connected to a stirring motor, and the other end of which is connected to a stirring paddle, the stirring paddle being close to the bottom of the activated denitrification tank. Under the stirring of the stirring device, the sewage and the denitrification carrier are fully mixed and reacted. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the sewage deep treatment system of the utility model.
[0021] Figure 2It is a structural schematic diagram of the three-stage processing of the utility model.
[0022] Figure 3 The figure is a top view of an activated denitrification tank according to an embodiment of the present invention.
[0023] Figure 4 This is a top view of an activated denitrification tank according to another embodiment of the present invention. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings of the specification. It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments.
[0025] Please refer to Figure 1 The utility model provides a sewage deep treatment system 100, comprising a primary treatment 11, a secondary treatment 12, and a tertiary treatment 13 connected in sequence. The primary treatment 11 comprises a coarse screen 111, a water intake pump room 112, a fine screen 113, and an aerated grit tank 114 connected in sequence. The sewage enters the coarse screen 111 to remove large floating objects and suspended matter in the sewage. The water intake pump room 112 sends the sewage treated by the coarse screen 111 to the fine screen 113 to remove smaller suspended matter and fibrous matter in the sewage. The sewage treated by the fine screen 113 flows into the aerated grit tank 114 to remove inorganic sand particles in the sewage. The secondary treatment 12 includes a secondary sedimentation tank 122. The front end of the activated denitrification tank 131 also has a second water inlet 1311, which is connected to the secondary sedimentation tank 122. The secondary treatment 12 also includes a biological reaction tank 121 connected to the secondary sedimentation tank 122. The sewage after the primary treatment 11 enters the biological reaction tank 121, and the organic pollutants in the sewage are removed through the metabolism of microorganisms; the sewage flows out of the biological reaction tank 121 and enters the secondary sedimentation tank 122 to clarify the mixed liquid after biological treatment, and at the same time, the sludge in the mixed liquid is concentrated. The tertiary treatment 13 includes an activated denitrification tank 131 and a coagulation sedimentation tank 132. The sewage after the secondary treatment 12 enters the activated denitrification tank 131 to remove nitrogen from the wastewater, and the sewage flowing out of the activated denitrification tank 131 enters the coagulation sedimentation tank 132 to further remove suspended matter and colloidal particles in the sewage. More specifically, the tertiary treatment 13 can achieve an average total nitrogen removal rate of 60%. For example, if the total nitrogen of the sewage after the secondary treatment 12 is 15-25 mg / L, the total nitrogen of the effluent can be 7-10 mg / L after the tertiary treatment 13. In order to better illustrate the significant effect of the tertiary treatment 13 of the present invention on reducing the total nitrogen content, the structure of the tertiary treatment 13 of the present invention is described in more detail below.
[0026] Please refer to Figure 2The tertiary treatment 13 of the utility model includes an activated denitrification tank 131 and a coagulation sedimentation tank 132. The activated denitrification tank 131 is provided with a stirring device 1312, a denitrification carrier 1313 is placed inside the activated denitrification tank 131, an activated sludge inlet 1314 is provided at the front end of the activated denitrification tank 131, a first water outlet 1315 is provided at the rear end of the activated denitrification tank 131, a first water inlet 1321 is provided at the front end of the coagulation sedimentation tank 132, a dosing device 1322 is also provided at the first water inlet 1321, an activated sludge outlet 1323 is provided at the bottom of the coagulation sedimentation tank 132, the first water outlet 1315 is connected to the first water inlet 1321, the activated sludge inlet 1314 is connected to the activated sludge outlet 1323 by a pipeline 133, and a sludge reflux pump 134 is provided on the pipeline 133. Compared with the prior art, the utility model sets a stirring device 1312 and places a denitrification carrier 1313 inside the activated denitrification tank 131, which maximizes the contact and reaction between sewage and the denitrification carrier 1313, optimizes the denitrification process, and enhances the denitrification effect. At the same time, the activated sludge inlet 1314 and the activated sludge outlet 1323 are connected by the pipeline 133, and the pipeline 133 is provided with a sludge return pump 134, so that after the denitrification carrier 1313 is precipitated in the coagulation sedimentation tank 132, most of the denitrification carrier 1313 is returned to the activated denitrification tank 131 through the sludge, and only a small amount of denitrification carrier 1313 is needed in the subsequent sequence, which greatly saves the operating cost. Importantly, the denitrification carrier 1313 can enhance the flocculation effect of the coagulation sedimentation tank 132, which can reduce the amount of medicine added in the dosing device 1322, thereby further reducing the operating cost. In addition, the utility model does not need to filter the water head and the backwashing device, so the structure is simple, thereby further reducing the operating cost. Further, the three-stage treatment 13 of the utility model can be used for denitrification in the deep treatment stage of municipal biochemical sewage treatment plants, and can also be applied to the deep treatment of small industrial wastewater with denitrification and phosphorus removal requirements.
[0027] Specifically, the type of denitrification carrier 1313 can be selected according to the general knowledge of those skilled in the art. For example, the denitrification carrier 1313 uses granular activated carbon as a matrix. Activated carbon has the characteristics of high specific surface area, strong adsorption capacity, good microbial adhesion, rich pore structure and renewability, which can significantly improve the denitrification effect and reduce the usage of the denitrification carrier 1313. The particle size of activated carbon is 0.15-0.3 mm. Activated carbon has a higher specific surface area within this particle size range, which provides a wider attachment space for denitrifying bacteria, helps to increase the amount of microorganisms per unit volume, and thus further improves the denitrification effect. More specifically, the preparation of the denitrification carrier 1313 includes: dissolving 100 kg of activated carbon with a particle size of 0.15 to 0.3 mm in 1 ton of water, fully mechanically stirring, and adding 1 kg of sodium acetate solid and 1 kg of caustic soda flakes to stir and mix to obtain the denitrification carrier 1313. More specifically, the denitrification carrier 1313 can be placed inside the activated denitrification tank 131 using a pneumatic diaphragm pump.
[0028] Please continue to refer to Figure 2 The dosing device 1322 of the utility model includes a phosphorus removal agent stirring box 13221 and a flocculant stirring box 13222 which are connected. The phosphorus removal agent stirring box 13221 is located between the flocculant stirring box 13222 and the activated denitrification tank 131. The phosphorus removal agent stirring box 13221 is arranged before the flocculant stirring box 13222 to ensure that the phosphorus removal agent and the phosphorus in the sewage are fully mixed to form a precipitate, and then the precipitate is removed in the subsequent flocculant stirring box 13222. In order to prevent the phosphorus removal agent and the flocculant from precipitating and being evenly distributed in the sewage, a stirrer is provided in both the phosphorus removal agent stirring box 13221 and the flocculant stirring box 13222. The stirrer may be, but is not limited to, a paddle stirrer. More specifically, the dephosphorization agent in the dephosphorization agent stirring tank 13221 may be, but not limited to, iron salt or polyaluminum chloride (PAC), and the flocculant in the flocculant stirring tank 13222 may be, but not limited to, polyacrylamide (PAM).
[0029] Please continue to refer to Figure 2 The stirring device 1312 of the utility model includes a rotating shaft 13121, one end of the rotating shaft 13121 is connected to a stirring motor 13122, and the other end of the rotating shaft 13121 is connected to a stirring paddle 13123, and the stirring paddle 13123 is close to the bottom of the activated denitrification tank 131. Under the stirring of the stirring device 1312, the sewage and the denitrification carrier 1313 are fully mixed and reacted.
[0030] Please see Figure 3The activated denitrification pool 131 of the utility model includes a pool body 1316 and a pool tank 1317 arranged inside the pool body 1316. The pool body 1316 is a cube structure, and the pool tank 1317 is a rounded cube structure. More specifically, the rounded corners of the pool tank 1317 correspond to the right angles of the pool body 1316. The rounded corner design of the pool tank 1317 can reduce water flow resistance to promote denitrification reaction. Of course, in a large-scale water treatment plant with continuous operation, when a larger water storage capacity is required, the pool body 1316 can also be Figure 4 The cylindrical structure shown in FIG. 13 is a cylindrical structure, and correspondingly, the tank 1317 is Figure 4 The cylindrical structure shown.
[0031] Please continue to refer to Figure 2 The coagulation sedimentation tank 132 of the utility model is at least one of a horizontal flow sedimentation tank, an inclined tube sedimentation tank or a vertical flow sedimentation tank. Specifically, the bottom of the coagulation sedimentation tank 132 is a conical structure. The conical structure gradually reduces the bottom area of the coagulation sedimentation tank 132, forming a natural slope, which helps the activated sludge to concentrate to the activated sludge outlet 1323 at the bottom, and facilitates the discharge of the activated sludge. At the same time, the conical structure can guide the water flow to form a stable spiral flow pattern. This flow helps the collision and coagulation between the suspended particles inside the coagulation sedimentation tank 132, thereby improving the coagulation effect. At the same time, the rear end of the coagulation sedimentation tank 132 has a second water outlet 1324. Furthermore, the second water outlet 1324 of the utility model is provided with a total nitrogen monitor 1325 for obtaining the total nitrogen concentration of the effluent. The total nitrogen monitor can monitor the total nitrogen index of the effluent in real time, thereby realizing dynamic control of process parameters.
[0032] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.
Claims
1. A sewage deep treatment system, characterized in that: The method comprises three-stage treatment, wherein the three-stage treatment comprises an activated denitrification tank and a coagulation sedimentation tank. A stirring device is arranged inside the activated denitrification tank, a denitrification carrier is placed inside the activated denitrification tank, an activated sludge inlet is arranged at the front end of the activated denitrification tank, a first water outlet is arranged at the rear end of the activated denitrification tank, a first water inlet is arranged at the front end of the coagulation sedimentation tank, a dosing device is also arranged at the first water inlet, an activated sludge outlet is arranged at the bottom of the coagulation sedimentation tank, the first water outlet is connected to the first water inlet, the activated sludge inlet is connected to the activated sludge outlet via a pipeline, and a sludge return pump is arranged on the pipeline.
2. The sewage deep treatment system according to claim 1, characterized in that: It also includes a secondary treatment connected to the tertiary treatment, the secondary treatment includes a secondary sedimentation tank, the front end of the activated denitrification tank also has a second water inlet, and the second water inlet is connected to the secondary sedimentation tank.
3. The sewage deep treatment system according to claim 1, characterized in that: The coagulation sedimentation tank is at least one of a horizontal flow sedimentation tank, an inclined tube sedimentation tank or a vertical flow sedimentation tank.
4. The sewage deep treatment system according to claim 1, characterized in that: The activated denitrification pool comprises a pool body and a pool tank arranged inside the pool body, the pool body is a cubic structure, and the pool tank is a rounded cubic structure.
5. The sewage deep treatment system according to claim 1, characterized in that: The activated denitrification pool comprises a pool body and a pool tank arranged inside the pool body, and both the pool body and the pool tank are cylindrical structures.
6. The sewage deep treatment system according to claim 1, characterized in that: The dosing device comprises a phosphorus removal agent stirring tank and a flocculant stirring tank which are connected to each other. The phosphorus removal agent stirring tank is located between the flocculant stirring tank and the activated denitrification tank.
7. The sewage deep treatment system according to claim 1, characterized in that: The denitrification carrier uses granular activated carbon as a matrix, and the particle size of the activated carbon is 0.15-0.3 mm.
8. The sewage deep treatment system according to claim 1, characterized in that: The bottom of the coagulation sedimentation tank is a conical structure.
9. The sewage deep treatment system according to claim 1, characterized in that: The rear end of the coagulation sedimentation tank is provided with a second water outlet, and a total nitrogen monitor for obtaining the total nitrogen concentration of the effluent is provided at the second water outlet.
10. The sewage deep treatment system according to claim 1, characterized in that: The stirring device comprises a rotating shaft, one end of which is connected to a stirring motor, and the other end of which is connected to a stirring paddle, and the stirring paddle is close to the bottom of the activated denitrification tank.