High-efficiency deep denitrification and dephosphorization sewage treatment equipment

Abstract

The utility model discloses efficient depth denitrification and dephosphorization sewage treatment equipment is cylindrical cylinder, and the baffle divides it into four sector, and they are dissolved oxygen zone, denitrification zone, coagulation zone and sedimentation zone, and the upper portion of dissolved oxygen zone is opened to have the feed inlet, and the bottom is equipped with first aeration pipe, and the submersible pump is equipped at its bottom, and the liquid of dissolved oxygen zone is transported to denitrification zone through the delivery pipe, the second aeration pipe and the second aeration head are equipped at the bottom of denitrification zone, and the autotrophic composite denitrification filler is equipped above the second aeration pipe, and the discharge hole is opened on the baffle between denitrification zone and coagulation zone above the autotrophic composite denitrification filler, the stirring shaft is equipped in coagulation zone, and the feeding pipe is inserted into coagulation zone from the top of coagulation zone, and the discharge pipe is equipped on the baffle between coagulation zone and sedimentation zone, the inclined pipe filler layer is equipped in the middle of sedimentation zone, the sludge collecting hopper is equipped between the lower end of inclined pipe filler layer and the bottom of sedimentation zone, the sludge pump is connected with the bottom of sludge collecting hopper, the water collecting tank is equipped in the arc edge of sedimentation zone, and the discharge port is opened outside water collecting tank.

Description

Technical Field

[0001] This utility model relates to a wastewater treatment device, and more particularly to a high-efficiency deep denitrification and phosphorus removal wastewater treatment device. Background Technology

[0002] Traditional biological treatment processes for nitrogen and phosphorus removal often suffer from problems such as high chemical consumption, high energy consumption, low cost efficiency, high carbon source requirements, and large amounts of residual sludge. Meanwhile, the current domestic wastewater quality in my country is characterized by a low carbon-to-nitrogen ratio, which can only be achieved by adding chemicals or extending the process unit in combination with chemicals. This not only fails to resolve the inherent contradictions in traditional nitrogen and phosphorus removal processes—such as carbon source competition between denitrification and phosphorus release, sludge age, and the lack of carbon sources for post-denitrification—but also results in the return flow carrying a large amount of oxygen, which cannot provide a suitable environment for anaerobic and facultative bacteria. This further leads to low and unstable phosphorus and nitrogen removal efficiency in practical engineering applications, making it difficult to simultaneously meet the nitrogen and phosphorus standards for effluent (DB11 / 307-2013). Therefore, this utility model proposes a high-efficiency, deep nitrogen and phosphorus removal wastewater treatment device to solve the problems existing in the prior art.

[0003] The existing known devices have the following disadvantages or deficiencies: 1) Traditional process equipment achieves microbial denitrification by controlling the DO in the biological tank between 0.5-1 mg / L to create an anaerobic environment. However, the internal recirculation carries a large amount of oxygen, which destroys the anaerobic environment and reduces the denitrification efficiency.

[0004] 2) Traditional secondary treatment processes often neglect the control of DO at the outlet, which leads to excessively high or low DO levels when connected to the deep treatment unit, affecting the deep denitrification effect and resulting in excessive use of carbon source or excessive energy consumption.

[0005] 3) Traditional deep treatment equipment achieves denitrification through heterotrophic denitrification. In addition to controlling DO, carbon source is also required to convert nitrate nitrogen (NO3–N) or nitrite nitrogen (NO2–N) into nitrogen gas (N2). The process control is complex and the operating cost is high.

[0006] 4) Current self-adaptive denitrification packing materials are greatly affected by pH value. When the pH is too low, the denitrification process will be promoted by adding alkalinity, which will increase the operating cost.

[0007] 5) Traditional deep denitrification and phosphorus removal equipment is mostly designed in a square or horizontal circular form, which often leads to redundant equipment space or loose connections. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of existing equipment in denitrification when oxygen content is insufficient, and to provide a highly efficient deep denitrification and phosphorus removal wastewater treatment equipment.

[0009] To achieve the objective of this invention, the present invention adopts the following technical solution: This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, comprising: a cylindrical body divided into four identical fan-shaped regions with an included angle of 90° by a baffle plate, which are sequentially designated as a dissolved oxygen zone, a denitrification zone, a coagulation zone, and a sedimentation zone. An inlet is located at the top of the dissolved oxygen zone, and several first aeration pipes with several first aeration heads are installed at the bottom of the dissolved oxygen zone. A submersible pump is installed at the bottom of the dissolved oxygen zone, and a delivery pipe is attached to the submersible pump to transport the liquid from the dissolved oxygen zone across the baffle plate to the lower part of the denitrification zone. Several second aeration pipes with several second aeration heads are installed at the bottom of the denitrification zone, and an autotrophic composite denitrification packing is installed above the second aeration pipes. The delivery pipe is inserted into the area between the autotrophic composite denitrification packing and the second aeration pipes. An outlet is located on the baffle plate between the denitrification zone and the coagulation zone above the autotrophic composite denitrification packing. The liquid treated in the denitrification zone enters the coagulation zone through the discharge port. A support plate is installed on the upper part of the partition between the denitrification zone and the coagulation zone. A stirring shaft is vertically mounted on the support plate and extends into the lower part of the coagulation zone. A motor is mounted on the support plate, driving the stirring shaft to rotate. A stirring wheel is installed at the lower end of the stirring shaft. A feed pipe is inserted from above the coagulation zone into the coagulation zone above the support plate. A discharge pipe is installed in the middle of the partition between the coagulation zone and the sedimentation zone, sending the liquid from the coagulation zone into the sedimentation zone. An inclined tube packing layer is installed in the middle of the sedimentation zone, with the inclined tube sedimentation tank inlet inserted into it. A sludge hopper is installed between the lower end of the inclined tube packing layer and the bottom of the sedimentation zone. A sludge pump is connected to the bottom of the sludge hopper via a pipe. A water collection trough is installed within the arc-shaped edge of the sedimentation zone above the inclined tube packing layer. The discharge port is located on the sedimentation zone outside the water collection trough, sending the liquid out of the high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment.

[0010] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, wherein: the water collection tank is set along the arc edge of the entire sedimentation zone, and a weir plate is located inside the water collection tank.

[0011] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, wherein: the upper end of the weir plate is serrated, and the liquid in the sedimentation zone passes over the weir plate and enters the collection tank.

[0012] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment, wherein: the discharge pipe is inserted downwards at an angle into the middle of the inclined tube packing layer in the sedimentation zone.

[0013] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment, wherein the sludge collection hopper is a hopper that is larger at the top and smaller at the bottom.

[0014] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment, wherein the lower end of the stirring shaft is 1 / 3 to 1 / 4 of the height of the entire coagulation zone.

[0015] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, wherein the discharge port 24 is located 20-30cm from the top of the denitrification zone 2.

[0016] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, wherein air is introduced into the first aeration pipe and the second aeration pipe by an air pump.

[0017] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment device, wherein the inclined tube packing layer 41 is composed of uniformly distributed inclined tubes.

[0018] This utility model discloses a high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment, wherein: the dissolved oxygen zone further includes: a dissolved oxygen detector and a liquid level gauge.

[0019] The high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment of this utility model has the following advantages: (1) The high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment of this utility model sets up a dissolved oxygen zone before entering the denitrification zone. On the one hand, it can control DO within the range of 1.5-3mg / L before entering the denitrification zone, ensuring the DO concentration of the denitrification unit. On the other hand, it reduces energy consumption and controls the range of fan selection.

[0020] (2) The packing material selected in the high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment of this utility model is a self-nutritive composite denitrification packing material. On the one hand, it can better reduce nitrate, carbon and nitrogen in an aerobic environment, and on the other hand, it can better supplement the alkalinity of the equipment and promote the efficient denitrification.

[0021] (3) The denitrification zone is closely followed by the coagulation zone and the sedimentation zone. On the one hand, it can control the total phosphorus concentration in the effluent, and on the other hand, it can control the turbidity better. At the same time, it can also make the equipment connection more compact and the process connection smoother.

[0022] (4) The high-efficiency deep denitrification and phosphorus removal sewage treatment equipment of this utility model can control the total nitrogen effluent of domestic sewage to below 10 mg / L and the total phosphorus to below 0.2 mg / L. Attached Figure Description

[0023] Figure 1 This is a top-view schematic diagram of a high-efficiency deep denitrification and phosphorus removal wastewater treatment device according to the present invention; Figure 2 From Figure 1 After cutting open at point AB, Figure 1 Rotate the left side of A clockwise by 90°. Figure 1 The diagram is shown on the right side of A after rotating 90° counterclockwise.

[0024] exist Figure 1 and Figure 2 In the diagram, number 1 represents the dissolved oxygen zone; number 2 represents the denitrification zone; number 3 represents the coagulation zone; number 4 represents the sedimentation zone; number 5 represents the baffle; number 11 represents the feed inlet; number 12 represents the first aeration head; number 13 represents the first aeration pipe; number 14 represents the submersible pump; number 15 represents the delivery pipe; number 16 represents the dissolved oxygen detector; number 17 represents the level gauge; number 21 represents the second aeration head; and number 22 represents the second aeration pipe. No. 23 is a self-supporting composite denitrification packing; No. 24 is a discharge hole; No. 31 is an agitator wheel; No. 32 is an agitator shaft; No. 33 is a feed pipe; No. 34 is a discharge pipe; No. 35 is a motor; No. 36 is a support plate; No. 41 is an inclined tube packing layer; No. 42 is a discharge port; No. 43 is a weir plate; No. 44 is a mud collection hopper; No. 45 is a mud pump; No. 46 is a water collection trough. Detailed Implementation

[0025] like Figure 1 and Figure 2 As shown, the high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment of this utility model is a cylindrical body. The partition 5 divides the cylindrical body into four identical fan-shaped areas with an included angle of 90°. These areas are, in order, dissolved oxygen zone 1, denitrification zone 2, coagulation zone 3, and sedimentation zone 4.

[0026] An inlet 11 is provided at the top of the dissolved oxygen zone 1. Several first aeration pipes 13 are installed at the bottom of the dissolved oxygen zone 1. Several first aeration heads 12 are installed on the first aeration pipes 13. A submersible pump 14 is installed at the bottom of the dissolved oxygen zone 1. A conveying pipe 15 is installed on the submersible pump 14. The liquid in the dissolved oxygen zone 1 is conveyed through the conveying pipe 15 to the lower part of the denitrification zone 2 through the partition 5. The dissolved oxygen zone 1 also includes a dissolved oxygen detector 16 and a level gauge 17.

[0027] Several second aeration pipes 22 are installed at the bottom of the denitrification zone 2. Several second aeration heads 21 are installed on the second aeration pipes 22. A self-growth composite denitrification packing 23 is installed above the second aeration pipes 22. The self-growth composite denitrification packing 23 is placed on a support plate (not shown in the figure). The conveying pipe 15 is inserted into the area between the self-growth composite denitrification packing 23 and the second aeration pipes 22. A discharge hole 24 is opened on the partition 5 between the denitrification zone 2 and the coagulation zone 3 above the self-growth composite denitrification packing 23. The discharge hole 24 is located 20-30 cm away from the top of the denitrification zone 2. The liquid treated in the denitrification zone 2 enters the coagulation zone 3 through the discharge hole 24.

[0028] A support plate 36 is installed on the upper part of the partition 5 between the denitrification zone 2 and the coagulation zone 3 in the coagulation zone 3. The stirring shaft 32 is vertically mounted on the support plate 36 and extends into the lower part of the coagulation zone 3. The height of the lower end of the stirring shaft 32 from the bottom of the coagulation zone 3 accounts for 1 / 3 to 1 / 4 of the total height of the coagulation zone 3. The motor 35 is mounted on the support plate 36 and drives the stirring shaft 32 to rotate. The stirring wheel 31 is mounted on the lower end of the stirring shaft 32. The feeding pipe 33 is inserted from above the coagulation zone 3 into the coagulation zone 3 above the support plate 36. A discharge pipe 34 is installed in the middle of the partition 5 between the coagulation zone 3 and the sedimentation zone 4. The discharge pipe 34 is inserted downward at an angle into the middle of the inclined tube packing layer 41 of the sedimentation zone 4. The discharge pipe 34 sends the liquid from the coagulation zone 3 into the sedimentation zone 4.

[0029] An inclined tube packing layer 41 is installed in the middle of the sedimentation zone 4. The inclined tube packing layer 41 is composed of evenly distributed inclined tubes. The inlet 34 of the inclined tube sedimentation tank is inserted into the inclined tube packing layer 41. A sludge hopper 44 is installed between the lower end of the inclined tube packing layer 41 and the bottom of the sedimentation zone 4. The sludge hopper 44 is a hopper that is larger at the top and smaller at the bottom. The sludge pump 45 is connected to the bottom of the sludge hopper 44 through a pipe. A water collection trough 46 is installed in the arc edge of the sedimentation zone 4 above the inclined tube packing layer 41. The water collection trough 46 is set along the entire arc edge of the sedimentation zone 4. Inside the water collection trough 46 is a weir plate 43. The upper end of the weir plate 43 is serrated. The liquid in the sedimentation zone 4 passes over the weir plate 43 and enters the water collection trough 46. The outlet 42 is opened on the sedimentation zone 4 outside the water collection trough 46, and the liquid is sent out of the high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment.

[0030] Wastewater treated by the biochemical unit enters the dissolved oxygen zone 1 of this high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment. A dissolved oxygen detector 16 is installed in dissolved oxygen zone 1. When DO ≤ 1.5 mg / L in dissolved oxygen zone 1, the bottom aeration system starts aeration; when DO ≥ 3.0 mg / L, the bottom aeration system stops aeration. A submersible pump 14 and a level gauge 17 are installed inside dissolved oxygen zone 1. When the level reaches the high level, the submersible pump 14 starts and lifts the wastewater in dissolved oxygen zone 1 to the bottom of denitrification zone 2 through the conveying pipe 15. The wastewater rises through the self-adhesive composite denitrification packing layer 23. The self-adhesive composite denitrification packing layer 23 is a composite packing that can reduce nitrates, carbons, and nitrogens, and remove N2 from the equipment. After passing through the self-adhesive composite denitrification packing layer 23, the wastewater enters the coagulation zone 3 through the discharge hole 24 connecting the denitrification zone 2 and the coagulation zone 3. After being fully mixed with the coagulant (polyaluminum chloride) in the dosing pipe 33, it enters the sedimentation zone 4 through the discharge pipe 34 to remove total phosphorus. The supernatant enters the water collection tank 46 through the weir plate 43 and is discharged through the discharge port 42.

[0031] The technical content of this utility model has been described above, but the protection scope of this utility model is not limited to the described content. Within the scope of knowledge possessed by those skilled in the art, various changes can be made to the technical content of this utility model without departing from the spirit of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency deep nitrogen and phosphorus removal wastewater treatment device, characterized in that: It is a cylindrical cylinder. The baffle (5) divides the cylindrical cylinder into four identical fan-shaped areas with an included angle of 90°. These are, in order, the dissolved oxygen zone (1), the denitrification zone (2), the coagulation zone (3), and the sedimentation zone (4). An inlet (11) is opened at the top of the dissolved oxygen zone (1). Several first aeration pipes (13) are installed at the bottom of the dissolved oxygen zone (1). Several first aeration heads (12) are installed on the first aeration pipes (13). A submersible pump (14) is installed at the bottom of the dissolved oxygen zone (1). A conveying pipe (15) is installed on the submersible pump (14). The liquid in the dissolved oxygen zone (1) is conveyed through the conveying pipe (15) over the baffle (5). The liquid is transported to the lower part of the denitrification zone (2); several second aeration pipes (22) are installed at the bottom of the denitrification zone (2), and several second aeration heads (21) are installed on the second aeration pipes (22). A self-growth composite denitrification packing (23) is installed above the second aeration pipes (22). The conveying pipe (15) is inserted into the area between the self-growth composite denitrification packing (23) and the second aeration pipes (22). A discharge hole (24) is opened on the partition (5) between the denitrification zone (2) and the coagulation zone (3) above the self-growth composite denitrification packing (23). The liquid treated by the denitrification zone (2) enters the denitrification zone (2) through the discharge hole (24). In the coagulation zone (3); a support plate (36) is installed on the upper part of the partition (5) between the denitrification zone (2) and the coagulation zone (3) in the coagulation zone (3). The stirring shaft (32) is vertically mounted on the support plate (36) and extends into the lower part of the coagulation zone (3). The motor (35) is mounted on the support plate (36) and drives the stirring shaft (32) to rotate. The stirring wheel (31) is mounted on the lower end of the stirring shaft (32). The feeding pipe (33) is inserted from above the coagulation zone (3) into the coagulation zone (3) above the support plate (36). A discharge pipe (34) is installed in the middle of the partition (5) between the coagulation zone (3) and the sedimentation zone (4). The feed pipe (34) sends the liquid from the coagulation zone (3) into the sedimentation zone (4); an inclined tube packing layer (41) is installed in the middle of the sedimentation zone (4), and the discharge pipe (34) is inserted into the inclined tube packing layer (41). A sludge hopper (44) is installed between the lower end of the inclined tube packing layer (41) and the bottom of the sedimentation zone (4). The sludge pump (45) is connected to the bottom of the sludge hopper (44) through a pipe. A water collection tank (46) is installed in the arc edge of the sedimentation zone (4) above the inclined tube packing layer (41). The discharge port (42) is opened on the sedimentation zone (4) outside the water collection tank (46) to send the liquid out of the high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment.

2. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 1, characterized in that: The water collection tank (46) is set along the arc edge of the entire sedimentation zone (4), and the inside of the water collection tank (46) is a weir plate (43).

3. The high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment as described in claim 2, characterized in that: The upper end of the weir plate (43) is serrated, and the liquid in the sedimentation zone (4) passes over the weir plate (43) and enters the water collection tank (46).

4. The high-efficiency deep denitrification and phosphorus removal wastewater treatment equipment as described in claim 3, characterized in that: The discharge pipe (34) is inserted downwards at an angle into the middle of the inclined tube packing layer (41) of the sedimentation zone (4).

5. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 4, characterized in that: The mud collection hopper (44) is a hopper that is larger at the top and smaller at the bottom.

6. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 5, characterized in that: The height of the lower end of the stirring shaft (32) from the bottom of the coagulation zone (3) is 1 / 3 to 1 / 4 of the total height of the coagulation zone (3).

7. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 6, characterized in that: The discharge hole (24) is located 20-30 cm from the top of the denitrification zone (2).

8. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 7, characterized in that: Air is supplied to the first aeration pipe (13) and the second aeration pipe (22) by an air pump.

9. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 8, characterized in that: The inclined tube packing layer (41) is composed of uniformly distributed inclined tubes.

10. The high-efficiency deep nitrogen and phosphorus removal wastewater treatment equipment as described in claim 9, characterized in that: The dissolved oxygen zone (1) also includes a dissolved oxygen detector (16) and a level gauge (17).

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