Crystal bead fluidization reaction device for treating pollutant-containing wastewater

Abstract

The utility model relates to the field of sewage treatment, in particular to a crystal bead fluidization reaction device for treating pollutant-containing wastewater, the crystal bead fluidization reaction device for treating pollutant-containing wastewater comprises a crystal bead fluidization tower and a high-efficiency separation tower, the crystal bead fluidization tower is used for carrying out crystal bead fluidization on wastewater, and the high-efficiency separation tower is used for carrying out high-efficiency separation on the wastewater; the efficient separation tower is used for carrying out secondary flocculent precipitation on the treated wastewater; the crystal bead fluidization tower and the efficient separation tower are both vertically arranged, a water outlet pipe is arranged at the top end of the crystal bead fluidization tower, a water inlet pipe is arranged at the bottom end of the efficient separation tower, and a conveying pipe is arranged between the water outlet pipe and the water inlet pipe and used for conveying waste water obtained after crystal bead fluidization from the crystal bead fluidization tower to the efficient separation tower. The sludge of the whole system is discharged from the crystal bead fluidization tower in a form of forming crystal beads, so that the effects of reducing the treatment capacity of the sludge and reducing the treatment cost of wastewater are achieved.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, and in particular to a crystal bead fluidized bed reactor for treating wastewater containing pollutants. Background Technology

[0002] Currently, industrial wastewater containing one or more pollutants such as high hardness, high silicon, high fluoride, high phosphorus, and heavy metals needs to be treated before discharge. The pollutants in the water need to be treated to meet the effluent requirements before the treated wastewater generated by industry can be discharged.

[0003] The existing conventional treatment method uses a two-stage sedimentation process, which typically includes a high-efficiency sedimentation tank and a loading sedimentation tank. The basic removal principle is chemical precipitation reaction. Existing two-stage sedimentation processes generally include: a primary circulating clarifier and a secondary high-efficiency sedimentation tank. In the primary circulating clarifier, chemicals are added to remove temporary hardness and some permanent hardness, while in the secondary high-efficiency sedimentation tank, chemicals are added to remove permanent hardness.

[0004] The existing technical solutions mentioned above have the following drawbacks: due to the large amount of pollutants in the wastewater, the amount of sludge produced after sedimentation is large, and the sludge can only be treated as hazardous waste for secondary treatment, resulting in high wastewater treatment costs. Utility Model Content

[0005] In order to reduce the amount of sludge to be treated and the cost of wastewater treatment, this application provides a crystal bead fluidized bed reactor for treating wastewater containing pollutants.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] A bead fluidized bed reactor for treating wastewater containing pollutants includes a bead fluidization tower and a high-efficiency separation tower. The bead fluidization tower is used to fluidize the wastewater into beads, and the high-efficiency separation tower is used to perform secondary flocculation and sedimentation on the treated wastewater. Both the bead fluidization tower and the high-efficiency separation tower are vertically arranged. The top of the bead fluidization tower is provided with an outlet pipe, and the bottom of the high-efficiency separation tower is provided with an inlet pipe. A conveying pipe is provided between the outlet pipe and the inlet pipe to transport the wastewater after bead fluidization from the bead fluidization tower to the high-efficiency separation tower.

[0008] Furthermore, the fluidized bed column includes a fluidized bed body, a gas supply pipe, a water supply pipe, a reagent delivery pipe, and a seed crystal delivery pipe. The gas supply pipe, water supply pipe, and reagent delivery pipe are all located at the bottom of the fluidized bed body. A gas distribution device is installed inside the fluidized bed body. The gas distribution device is fixedly connected to and communicates with the gas supply pipe. The water inlet of the water supply pipe is located below the gas distribution device. The reagent delivery pipe is located above the gas distribution device. The seed crystal delivery pipe is located at the top of the fluidized bed body and is used to deliver seed crystals into the fluidized bed body.

[0009] Furthermore, a crystal bead collecting tube is provided above the gas distribution device. The crystal bead collecting tube is symmetrically arranged with the drug delivery tube. The crystal bead collecting tube is used to collect mature crystal beads and discharge them from the tube body.

[0010] Furthermore, the aeration device includes an aeration plate, aeration heads, and water distribution pipes. The aeration plate is horizontally arranged inside the fluidizing tower. Several aeration heads are arranged on the aeration plate, and an aeration channel is arranged inside the aeration plate. Each aeration head is connected to the aeration channel. Several water distribution pipes are arranged on the aeration plate. Each water distribution pipe passes through both ends of the aeration plate and is not connected to the aeration channel. The water distribution pipes are used to allow wastewater to pass through the aeration plate.

[0011] Furthermore, a drain pipe is provided at the bottom of the fluidization tower body, which is used to discharge wastewater from the fluidization tower body during maintenance.

[0012] Furthermore, the high-efficiency separation tower includes a separation tower body, a fluidizing cylinder, and an air inlet pipe. The separation tower body is fixedly connected to the working surface, the fluidizing cylinder is fixed inside the separation tower body, and one end of the water inlet pipe and the air inlet pipe passes through the side wall of the separation tower body and enters the fluidizing cylinder. Both the water inlet pipe and the air inlet pipe are fixedly connected to the separation tower body.

[0013] Furthermore, a feeding device is provided inside the fluidizing cylinder. The feeding device is used to deliver flocculant into the fluidizing cylinder. The feeding device includes a conveying pipe and a feeding pipe. The feeding pipe is fixed inside the fluidizing cylinder and is used to deliver flocculant into the fluidizing cylinder. One end of the conveying pipe passes through the separation tower and the fluidizing cylinder and is fixedly connected to and communicates with the feeding pipe.

[0014] Furthermore, a connecting rod is provided between the fluidizing cylinder and the separation tower body, and the two ends of the connecting rod are fixedly connected to the fluidizing cylinder and the separation tower body respectively.

[0015] Furthermore, a mud-water separation device is provided at the top of the separation tower body. The mud-water separation device includes an outer shell and separation plates. The outer shell is fixedly connected to the separation tower body. Several separation plates are provided, and the several separation plates are evenly distributed inside the outer shell. Each separation plate is inclined and the several separation plates are arranged in parallel. Each separation plate is fixedly connected to the outer shell.

[0016] Furthermore, a water outlet weir is provided above the mud-water separation device, and the water outlet weir is fixedly connected to the mud-water separation device.

[0017] In summary, this application has the following technical effects:

[0018] 1. By setting up a crystal bead fluidized tower and a high-efficiency separation tower, and connecting the crystal bead fluidized tower and the high-efficiency separation tower with a conveying pipe, the crystal bead fluidized tower is filled with reagents and crystal seeds to achieve crystal bead fluidization. Then, coagulants and flocculants are added to the high-efficiency separation tower to achieve sludge flocculation and sedimentation. The settled sludge is then transported back to the crystal bead fluidized tower for fluidization to achieve wastewater treatment. All sludge in the entire system is discharged from the crystal bead fluidized tower in the form of crystal beads, thereby reducing the amount of sludge to be treated and reducing the cost of wastewater treatment.

[0019] 2. By setting up an air distribution device, an air distribution channel is set inside the air distribution plate, and several aeration heads are connected through the air distribution channel. Then, the water distribution pipe is not connected to the air distribution channel, so that after the water passes through the air distribution plate through the water distribution pipe, it is turbulent by the aeration heads, so that the water and the agent are fully and evenly mixed. At the same time, the airflow can blow the small crystal beads into a suspended state, so that the crystal beads will fall to the bottom of the crystal bead fluidization tower for collection after they mature.

[0020] 3. By setting up a fluidizing cylinder and an air inlet pipe, the water after the crystal beads are fluidized undergoes multiple cycles of flocculation and sedimentation in the separation tower. The air inlet pipe provides sufficient power for the wastewater circulation, ensuring that the mixture of mud and water can form a circulating fluidization inside and outside the fluidizing cylinder. Through continuous fluidization, the small flocs become large flocs and become more compact. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a crystal bead fluidized bed reactor for treating wastewater containing pollutants, as described in this application.

[0022] Figure 2 This is a schematic diagram of the structure of the bead fluidization tower after it is opened according to this application;

[0023] Figure 3 This is a schematic diagram of the structure of the high-efficiency separation tower after it is opened.

[0024] In the diagram, 1. Fluidized bed tower; 11. Fluidized bed tower body; 12. Gas supply pipe; 13. Water supply pipe; 14. Reagent delivery pipe; 15. Seed delivery pipe; 16. Crystal bead collection pipe; 17. Drainage pipe; 18. Water outlet pipe; 2. High-efficiency separation tower; 21. Water inlet pipe; 22. Separation tower body; 23. Fluidized bed; 24. Gas inlet pipe; 3. Conveying pipe; 4. Gas distribution device; 41. Gas distribution plate; 42. Aeration head; 43. Water distribution pipe; 5. Material distribution device; 51. Material delivery pipe; 52. Material distribution pipe; 6. Connecting rod; 7. Sludge-water separation device; 71. Outer shell; 72. Separation plate; 8. Water outlet weir. Detailed Implementation

[0025] The present application will be further described in detail below with reference to the accompanying drawings.

[0026] Reference Figure 1This embodiment provides a bead fluidized bed reactor for treating wastewater containing pollutants, including a bead fluidized bed tower 1 and a high-efficiency separation tower 2. The bead fluidized bed tower 1 is used to fluidize the wastewater into beads, and the high-efficiency separation tower 2 is used to perform secondary flocculation and sedimentation on the treated wastewater. Both the bead fluidized bed tower 1 and the high-efficiency separation tower 2 are vertically arranged. The top of the bead fluidized bed tower 1 is provided with an outlet pipe 18, and the bottom of the high-efficiency separation tower 2 is provided with an inlet pipe 21. A conveying pipe 3 is provided between the outlet pipe 18 and the inlet pipe 21. The conveying pipe 3 is used to convey the wastewater after bead fluidization from the bead fluidized bed tower 1 to the high-efficiency separation tower 2.

[0027] Reference Figure 1 and Figure 2 The crystal bead fluidized bed tower 1 includes a fluidized bed tower body 11, a gas supply pipe 12, a water supply pipe 13, a reagent delivery pipe 14, and a seed crystal delivery pipe 15. The gas supply pipe 12, water supply pipe 13, and reagent delivery pipe are all located at the bottom of the fluidized bed tower body 11. A gas distribution device 4 is installed inside the fluidized bed tower body 11. The gas distribution device 4 is fixedly connected to and communicates with the gas supply pipe 12. The inlet of the water supply pipe 13 is located below the gas distribution device 4, and the reagent delivery pipe 14 is located below the gas distribution device 4. Above, a seed crystal dispensing pipe 15 is installed at the top of the fluidized tower body 11. The seed crystal dispensing pipe 15 is used to dispense seed crystals into the fluidized tower body 11. Above the gas distribution device 4, a crystal bead collecting pipe 16 is installed. The crystal bead collecting pipe 16 is symmetrically arranged with the reagent dispensing pipe 14. The crystal bead collecting pipe 16 is used to collect mature crystal beads and discharge them from the pipe body. At the bottom of the fluidized tower body 11, a drain pipe 17 is installed. The drain pipe 17 is used to discharge wastewater from the fluidized tower body 11 during maintenance.

[0028] Reference Figure 2 The aeration device 4 includes an aeration plate 41, an aeration head 42, and a water distribution pipe 43. The aeration plate 41 is horizontally arranged inside the fluidization tower body 11. Several aeration heads 42 are arranged on the aeration plate 41. An aeration channel is arranged inside the aeration plate 41. Each aeration head 42 is connected to the aeration channel. Several water distribution pipes 43 are arranged on the aeration plate 41. Each water distribution pipe 43 passes through both ends of the aeration plate 41. Each water distribution pipe 43 is not connected to the aeration channel. The water distribution pipes 43 are used to allow wastewater to pass through the aeration plate 41.

[0029] Reference Figure 1 and Figure 3The high-efficiency separation tower 2 includes a separation tower body 22, a fluidizing cylinder 23, and an air inlet pipe 24. The separation tower body 22 is fixedly connected to the working surface. The fluidizing cylinder 23 is fixed inside the separation tower body 22. One end of the water inlet pipe 21 and the air inlet pipe 24 passes through the side wall of the separation tower body 22 and enters the fluidizing cylinder 23. Both the water inlet pipe 21 and the air inlet pipe 24 are fixedly connected to the separation tower body 22. A material distribution device 5 is installed inside the fluidizing cylinder 23. The material distribution device 5 is used to distribute material into the fluidizing cylinder 23. The flocculant conveying device 5 includes a conveying pipe 51 and a distributing pipe 52. The distributing pipe 52 is fixed inside the fluidizing cylinder 23 and is used to convey flocculant into the fluidizing cylinder 23. One end of the conveying pipe 51 passes through the separation tower body 22 and the fluidizing cylinder 23 and is fixedly connected to and communicates with the distributing pipe 52. A connecting rod 6 is provided between the fluidizing cylinder 23 and the separation tower body 22. The two ends of the connecting rod 6 are fixedly connected to the fluidizing cylinder 23 and the separation tower body 22, respectively.

[0030] Reference Figure 3 The top of the separation tower 22 is provided with a mud-water separation device 7. The mud-water separation device 7 includes a shell 71 and a separation plate 72. The shell 71 is fixedly connected to the separation tower 22. Several separation plates 72 are provided, which are evenly distributed inside the shell 71. Each separation plate 72 is inclined and parallel. Each separation plate 72 is fixedly connected to the shell 71. A ring of water outlet weir 8 is provided above the mud-water separation device 7. The water outlet weir 8 is fixedly connected to the mud-water separation device 7.

[0031] Reference Figure 3 In this embodiment, a sludge discharge pipe is also provided at the bottom of the separation tower body 22. The sludge discharge pipe is used to discharge the precipitated sludge in the separation tower body 22 through a pump. The sludge discharge pipe is connected to the water supply pipe 13 of the fluidization tower body 11. The sludge discharged from the sludge discharge pipe is returned to the fluidization tower body 11 as dense sludge for crystal bead fluidization, so that the sludge of the entire system is discharged from the crystal bead fluidization tower 1 in the form of crystal beads.

[0032] Reference Figure 3 In this embodiment, a pH meter and a coagulant addition device are also provided on the conveying pipe 3. The pH meter is used to measure the pH value of the water after the crystal beads are fluidized in the conveying pipe 3. The pH value is controlled between 9.5 and 10.3. The pH meter controls the amount of crystal seeds added through PLC interlock. Before the water conveyed by the conveying pipe 3 enters the high-efficiency separation tower 2, coagulant is added to the conveying pipe 3 in advance. In this embodiment, a pipeline mixer is set on the conveying pipe 3 to add coagulant to the conveying pipe 3. In this embodiment, the coagulant can be aluminum salt, iron salt, aluminum-iron mixed salt, etc.

[0033] The implementation principle of the crystal bead fluidized bed reactor for treating wastewater containing pollutants according to an embodiment of this application is as follows: During wastewater treatment, wastewater is first fed into the fluidized bed tower 11 through the water supply pipe 13. Then, the water flows through the water distribution pipe 43 into the air distribution plate 41. High-pressure airflow enters the air distribution plate 41 through the air supply pipe 12, and then overflows through the aeration head 42, contacting the water flow and agitating the airflow. The reagent is added into the fluidized bed tower 11 through the reagent delivery pipe 14. The airflow agitates the water flow, causing the reagent and wastewater to mix. Seed crystals enter the fluidized bed tower through the seed crystal delivery pipe 15. Inside the fluidizing tower 11, the small particles generated by the reagent and wastewater combine with the seed crystals and coat the surface of the seed crystals, forming the prototype of the crystal beads. As wastewater and high-pressure airflow continuously enter the fluidizing tower 11, all the prototype crystal beads are suspended in the fluidizing tower 11. Then, they are continuously coated with newly generated small particles. Finally, through continuous fluidization and circulation, mature crystal beads are formed. At this time, the flow of wastewater and high-pressure airflow is not enough to support the mature crystal beads. The mature crystal beads will settle and accumulate on the air distribution plate 41, and then be discharged from the crystal bead collection pipe 16 from the crystal bead fluidizing tower 1.

[0034] The wastewater after the reaction enters the conveying pipe 3 through the outlet pipe 18 at the top of the fluidized bed 11. The pH value is then measured using a pH meter in the conveying pipe 3, and the dosage of reagents and seed crystals in the fluidized bed 11 is adjusted accordingly. The wastewater then enters the high-efficiency separation tower 2. Before the treated wastewater enters the separation tower 22 via the conveying pipe 3, coagulant is added using a pipe mixer. Due to the high upward flow velocity of the crystal fluidized bed 1, the suspended solids in the effluent from the outlet pipe 18 are still relatively high, typically >100 mg / L. Therefore, the addition of coagulant will destabilize the effluent, resulting in the formation of numerous small flocs. The inlet pipe 21 leads to the bottom of the fluidized bed 23, which is equipped with a flocculant distribution pipe 52. The flocculant delivered by the conveying pipe 51 is evenly distributed within the fluidized bed 23 via the distribution pipe 52. The small flocs formed after adding the coagulant combine with the added flocculant, resulting in... The flocs grow larger; the air inlet pipe 24 at the bottom of the fluidizing cylinder 23 supplies gas into the fluidizing cylinder 23, providing sufficient power for the sewage circulation to ensure that the mixture of mud and water can form a circulating fluidization inside and outside the fluidizing cylinder 23. Through continuous fluidization, the small flocs become large flocs and become more compact. When the flocs are heavy enough, they will slowly settle to the bottom of the high-efficiency separation tower 2. The relatively compact sludge is pumped back to the crystal bead fluidizing tower 1 from the sludge discharge pipe. All the sludge in the system is discharged from the crystal bead fluidizing tower 1 in the form of crystal beads. Water containing a small amount of flocs enters the mud-water separation device 7. Under the action of the separation plate 72 set in the mud-water separation device 7, the flocs are helped to settle downward under the obstruction of the separation plate 72, thereby achieving mud-water separation and ensuring better separation effect. The separated mud-water passes through the effluent weir 8 at the top of the high-efficiency separation tower 2 to ensure uniform effluent discharge around the perimeter.

[0035] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A beaded fluidized bed reactor for treating wastewater containing pollutants, characterized in that: The application relates to a wastewater treatment device, which comprises a crystal bead fluidized tower (1) and a high-efficiency separation tower (2), the crystal bead fluidized tower (1) is used for fluidizing crystal beads in wastewater, and the high-efficiency separation tower (2) is used for secondary flocculation and precipitation of treated wastewater; the crystal bead fluidized tower (1) and the high-efficiency separation tower (2) are vertically arranged, the top end of the crystal bead fluidized tower (1) is provided with a water outlet pipe (18), the bottom end of the high-efficiency separation tower (2) is provided with a water inlet pipe (21), and a conveying pipe (3) is arranged between the water outlet pipe (18) and the water inlet pipe (21), and the conveying pipe (3) is used for conveying the wastewater fluidized by the crystal beads from the crystal bead fluidized tower (1) to the high-efficiency separation tower (2).

2. A fluidized bead reactor for treating wastewater containing pollutants according to claim 1, characterized in that: The crystal bead fluidized tower (1) comprises a fluidized tower body (11), a gas conveying pipe (12), a water conveying pipe (13), a medicament feeding pipe (14) and a crystal seed feeding pipe (15), the gas conveying pipe (12), the water conveying pipe (13) and the medicament feeding pipe (14) are arranged at the bottom of the fluidized tower body (11), a gas distribution device (4) is arranged in the fluidized tower body (11), the gas distribution device (4) is fixedly connected with and communicates with the gas conveying pipe (12), the water inlet of the water conveying pipe (13) is located below the gas distribution device (4), the medicament feeding pipe (14) is located above the gas distribution device (4), and the crystal seed feeding pipe (15) is arranged at the top of the fluidized tower body (11) and is used for feeding crystal seeds into the fluidized tower body (11).

3. A fluidized bed reactor for treating wastewater containing pollutants according to claim 2, wherein: An upper portion of the gas distribution device (4) is provided with a crystal bead collecting pipe (16), the crystal bead collecting pipe (16) is symmetrically arranged with the medicament feeding pipe (14), and the crystal bead collecting pipe (16) is used for collecting mature crystal beads and discharging the pipe body.

4. A fluidized bed reactor for treating wastewater containing pollutants according to claim 2, wherein: The gas distribution device (4) comprises a gas distribution plate (41), an aeration head (42) and a water distribution pipe (43), the gas distribution plate (41) is horizontally arranged in the fluidized tower body (11), a plurality of aeration heads (42) are arranged on the gas distribution plate (41), a gas distribution channel is arranged in the gas distribution plate (41), each aeration head (42) communicates with the gas distribution channel, a plurality of water distribution pipes (43) are arranged on the gas distribution plate (41), each water distribution pipe (43) penetrates through both ends of the gas distribution plate (41), each water distribution pipe (43) does not communicate with the gas distribution channel, and the water distribution pipe (43) is used for allowing wastewater to pass through the gas distribution plate (41).

5. A fluidized bed reactor for the treatment of wastewater containing pollutants according to claim 4, characterized in that: A bottom end of the fluidized tower body (11) is provided with a drain pipe (17), and the drain pipe (17) is used for discharging wastewater in the fluidized tower body (11) during maintenance.

6. The bead fluidized reactor of claim 1 wherein: The high-efficiency separation tower (2) comprises a separation tower body (22), a fluidized cylinder (23) and an air inlet pipe (24), the separation tower body (22) is fixedly connected with a working surface, the fluidized cylinder (23) is fixed in the separation tower body (22), one end of the water inlet pipe (21) and the air inlet pipe (24) penetrates through the side wall of the separation tower body (22) and enters the fluidized cylinder (23), and the water inlet pipe (21) and the air inlet pipe (24) are fixedly connected with the separation tower body (22).

7. A fluidized bed reactor for the treatment of wastewater containing pollutants according to claim 6, characterized in that: The fluidizing cylinder (23) is internally provided with a distributing device (5) for feeding flocculants into the fluidizing cylinder (23), the distributing device (5) comprises a feeding pipe (51) and a distributing pipe (52), the distributing pipe (52) is fixed in the fluidizing cylinder (23) and is used for feeding flocculants into the fluidizing cylinder (23), one end of the feeding pipe (51) penetrates through the separation tower body (22) and the fluidizing cylinder (23) and is fixedly connected and communicated with the distributing pipe (52).

8. A fluidized bead reactor for treating wastewater containing pollutants according to claim 6, wherein: The fluidizing cylinder (23) and the separation tower body (22) are provided with a connecting rod (6), and the two ends of the connecting rod (6) are fixedly connected with the fluidizing cylinder (23) and the separation tower body (22) respectively.

9. A fluidized bed reactor for treating wastewater containing pollutants according to claim 6, wherein: The top end of the separation tower body (22) is provided with a sludge-water separation device (7), the sludge-water separation device (7) comprises a shell (71) and a plurality of separation plates (72), the shell (71) is fixedly connected with the separation tower body (22), the plurality of separation plates (72) are uniformly distributed in the shell (71), each separation plate (72) is obliquely arranged, the plurality of separation plates (72) are arranged in parallel, and each separation plate (72) is fixedly connected with the shell (71).

10. A bead fluidized reactor for the treatment of wastewater containing pollutants according to claim 9, characterized in that: A water outlet weir (8) is arranged above the sludge-water separation device (7), and the water outlet weir (8) is fixedly connected with the sludge-water separation device (7).

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