Sequencing batch type integrated fluorine-containing wastewater treatment device

Abstract

The utility model discloses a sequencing batch type integrated fluorine-containing wastewater treatment device. A device body is provided with a stirrer, a spoiler, an aeration pipe, a manhole, a steel ladder stand, a top overhaul channel, a guardrail, a liquid level meter and a pH online monitoring system, a water inlet manual valve, a water inlet automatic valve and a fluorine ion online monitoring device are arranged on a water inlet pipeline of the device; a water outlet manual valve and a water outlet automatic valve are arranged on a water drainage pipeline of the device; a fluorine ion sampling pipeline and a fluorine ion online monitoring device are arranged at the middle end of the device; a sludge discharge pipeline is arranged at the bottom of the device and is provided with a sludge discharge pump, a matched manual valve and a matched automatic valve. A dosing pipeline (lime solution, acid, PAM, fluorine removal agent and PAC) is arranged at the top of the device; the device disclosed by the utility model is suitable for the defluorination requirement of wastewater with different fluorine concentrations, eliminates a mixing tank, a flocculation tank and a sedimentation tank which are connected in series in multiple stages in the traditional process, realizes the integration of coagulation, flocculation, sedimentation and pH regulation, is convenient to operate, small in occupied area and high in efficiency, and greatly reduces the capital construction investment and operation cost.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology and relates to a sequential batch integrated fluoride-containing wastewater treatment device. Background Technology

[0002] In recent years, with the rapid development of industries such as steel metallurgy and lithium-ion batteries, the discharge of fluoride-containing wastewater during production has shown an increasing trend. As the country's requirements for the reuse and discharge of industrial wastewater are becoming increasingly stringent, the treatment of fluoride-containing wastewater to meet standards cannot be ignored.

[0003] High concentrations of fluoride ions in water are often removed using a combination of calcium and aluminum salts. After treatment, the residual fluoride ion concentration in the water is generally around 10 mg / L. However, due to stringent requirements for fluoride-containing wastewater discharge in some areas, a defluorinating agent can be added after conventional purification of high-fluoride wastewater for deep defluorination, reducing the effluent fluoride ion concentration to 1 mg / L. The main mechanism of fluoride removal using calcium and aluminum salts is coagulation and sedimentation. The coagulation effect and sludge-water separation are crucial aspects of this process, and their operational status directly affects the effluent quality.

[0004] In the prior art, such as Chinese Patent Publication No. CN209906413U, a coagulation sedimentation defluorination reaction device is disclosed. Its technical solution utilizes the combined action of alkaline solution, acid solution, calcium chloride, and PAM to remove fluoride. Water inlet and outlet are controlled by a level gauge, and sludge discharge pumps and sludge return pumps are installed to control sludge discharge and return, thereby improving calcium salt utilization. However, this patent does not optimize the impeller design of the mixer or include baffles, resulting in poor flocculation and sedimentation effects. Furthermore, the method of simply adding calcium salts is not suitable for deep defluorination.

[0005] Therefore, in order to improve the coagulation and sedimentation effect of the defluoridation system, meet the requirements of defluoridation mechanism for small-volume wastewater, and provide a process option for deep defluoridation, it is necessary to design a sequencing batch reactor integrated fluoride-containing wastewater treatment device. Utility Model Content

[0006] In view of this, the purpose of this utility model is to solve the above problems and provide a sequential batch integrated fluoride wastewater treatment device. It solves the problems of poor coagulation and sedimentation effect, inability to perform deep fluoride removal, and inability to adapt to small-volume wastewater systems in the existing defluorination equipment. At the same time, it eliminates the multi-stage series mixing tank, flocculation tank and sedimentation tank in the traditional process, realizes the integration of coagulation, flocculation, sedimentation and pH adjustment, and is convenient to operate, has a small footprint and high efficiency, and greatly reduces infrastructure investment and operating costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A sequencing batch integrated fluoride-containing wastewater treatment device includes an integrated device body, the upper part of which is cylindrical and the lower part is funnel-shaped;

[0009] The device body is internally equipped with:

[0010] A mixer is used to mix wastewater and chemicals;

[0011] A steel mixer support frame is located inside the lower part of the device body to support the mixer;

[0012] An aeration pipe is installed below the mixer support to promote mixing and flocculation;

[0013] A baffle plate is installed on the upper inner wall of the device body to improve sedimentation efficiency and optimize water flow distribution;

[0014] The device body is provided with:

[0015] A level gauge is used to monitor water levels;

[0016] pH online monitoring system is used to monitor the pH value of water bodies;

[0017] The inlet pipeline is equipped with a manual inlet valve, an automatic inlet valve, and an online fluoride ion monitoring device for introducing fluoride-containing wastewater.

[0018] The lime solution dosing pipeline, acid dosing pipeline, PAM dosing pipeline, defluorinating agent dosing pipeline, and PAC dosing pipeline are all located on the top of the device body and are used to add treatment agents;

[0019] An overflow pipe is installed on the upper side of the device body to control the liquid level and discharge excess water.

[0020] A fluoride ion sampling pipeline is installed on the side of the middle section of the device body. The fluoride ion sampling pipeline is equipped with a manual valve, an automatic valve, and an online fluoride ion monitoring device for detecting the fluoride ion concentration in the water.

[0021] The water outlet pipe is located on the lower side of the device body. The water outlet pipe is equipped with a manual water outlet valve and an automatic water outlet valve for discharging the treated supernatant.

[0022] A sludge discharge pipeline is located at the bottom of the device body and connected to a sludge discharge pump for discharging sludge.

[0023] Furthermore, the aeration pipeline includes an aeration main pipe and an aeration branch pipe. A manual valve is installed on the aeration main pipe, and a manual valve and an automatic valve are installed on the aeration branch pipe. The aeration branch pipe is connected to the main body of the device.

[0024] Furthermore, the sludge discharge pipeline is equipped with a manual sludge discharge valve and an automatic sludge discharge valve, the sludge inlet pipeline of the sludge discharge pump is equipped with a manual valve and a flexible connection, and the sludge outlet pipeline of the sludge discharge pump is equipped with a flexible connection, a check valve, an automatic valve, and a pressure monitoring device.

[0025] Furthermore, the mixer is equipped with multiple layers of upward-lifting blades to improve the uniformity of mixing between the wastewater and the reagent at the bottom.

[0026] Furthermore, the position of the water inlet of the outlet pipe is consistent with the cylindrical bottom end of the device body to avoid sucking in bottom sludge.

[0027] Furthermore, the sludge discharge pipe has an arc inside the device body, with a bending radius of 5 to 8 times the pipe diameter, to prevent sludge blockage.

[0028] Furthermore, the device body is equipped with a maintenance platform and guardrail on the top, and a steel ladder and manhole on the side for easy inspection and maintenance.

[0029] The beneficial effects of this utility model are as follows:

[0030] 1. Integrated design and simplified process: This utility model integrates coagulation, flocculation, sedimentation and pH adjustment into one integrated device body, eliminating the need for multi-stage series mixing tanks, flocculation tanks and sedimentation tanks in traditional processes, significantly reducing the footprint and infrastructure investment, and is particularly suitable for small-volume wastewater treatment scenarios.

[0031] 2. High-efficiency defluoridation to meet advanced treatment requirements: The device can reduce the fluoride ion concentration in the effluent to below 1 mg / L through the synergistic effect of lime solution, PAC, PAM and special defluoridating agent, meeting high emission standards and overcoming the limitations of traditional calcium salt defluoridation in achieving advanced defluoridation.

[0032] 3. Optimized coagulation and sedimentation effect: The installation of baffles, multi-layer upward lifting agitator blades and aeration pipes significantly improves the mixing uniformity of wastewater and reagents and the flocculation efficiency.

[0033] 4. Sludge reuse reduces operating costs: By retaining a portion of the sludge in the funnel-shaped cylinder and using aeration pipes and mixers to lift and mix the bottom sludge, sludge reuse is achieved, improving calcium salt utilization and fluoride ion removal rates. Simultaneously, the sludge return pump is eliminated, reducing equipment investment and operating / maintenance costs.

[0034] 5. Easy to operate and simple to maintain: The device is equipped with a level gauge, pH online monitoring system and fluoride ion online monitoring device to monitor the operating status in real time and facilitate automated control; the design of the maintenance platform, guardrail, steel ladder and manhole facilitates inspection and maintenance and reduces the difficulty of operation and management.

[0035] 6. Anti-clogging design and stable operation: The sludge discharge pipeline adopts an arc design with a bending radius of 5 to 8 times the pipe diameter, which effectively prevents sludge from clogging; the water outlet pipeline has an optimized suction port position to avoid sucking in bottom sludge and ensure long-term stable operation of the system.

[0036] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0038] Figure 1 This is a structural schematic diagram of one embodiment of the present invention.

[0039] Figure 2 This is a top view structural diagram of one embodiment of the present invention.

[0040] Figure 3 This is a bottom top view of one embodiment of the present invention.

[0041] Figure 4 yes Figure 1 Cross-sectional view at point AA.

[0042] Figure 5 yes Figure 1 Cross-sectional view at point BB.

[0043] Attached reference numerals: 1-Main inlet pipe; 2-Branch inlet pipe; 3-Manual inlet valve; 4-Automatic inlet valve; 5-Online fluoride ion monitoring device; 6-Level gauge; 7-Online pH monitoring system; 8-Agitator; 9-Overflow pipe; 10-Outlet pipe; 11-Automatic outlet valve; 12-Manual outlet valve; 13-Manual valve for fluoride ion sampling tube; 14-Automatic valve for fluoride ion sampling tube; 15-Online fluoride ion monitoring device; 16-Fluoride ion sampling tube; 17-Baffle plate; 18-Manual valve for aeration branch pipe; 19-Automatic valve for aeration branch pipe; 20-Manual valve for main aeration pipe; 21-Aeration branch pipe; 22-Agitator support; 23-Sludge discharge branch pipe; 24-Sludge discharge. 25-Manual valve for branch pipe; 26-Automatic valve for sludge discharge branch pipe; 27-Manual valve for sludge discharge pump inlet pipe; 28-Flexible connection for sludge discharge pump inlet pipe; 29-Sludge discharge pump; 30-Sludge discharge pump outlet pipe; 31-Pressure monitoring device for sludge discharge pump outlet pipe; 32-Flexible connection for sludge discharge pump outlet pipe; 33-Check valve for sludge discharge pump outlet pipe; 34-Automatic valve for sludge discharge pump outlet pipe; 35-Main sludge discharge pipe; 36-Lime solution dosing pipe; 37-Acid dosing pipe; 38-PAM dosing pipe; 39-Defluorinating agent dosing pipe; 40-PAC dosing pipe; 41-Main aeration pipe; 42-Equipment body; 43-Manhole; 44-Maintenance platform and guardrail; 45-Ladder. Detailed Implementation

[0044] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0045] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0046] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0047] like Figures 1-5 As shown, the sequencing batch integrated fluoride wastewater treatment device in this embodiment includes an integrated device body 42. A mixer 8 is installed inside the device body 42. The mixer 8 has multiple layers of upward-lifting blades to facilitate uniform mixing of the wastewater and chemicals at the bottom, improving flocculation effect and chemical utilization. A steel mixer support 22 is installed at the lower end of the device body 42. Four baffles 17 spaced at 90° intervals are installed inside the device body to improve sedimentation efficiency and optimize water flow distribution. An aeration pipeline is installed below the mixer support 22 to accelerate mixing and enhance flocculation effect. The upper part of the device body is cylindrical, and the lower part is funnel-shaped. A portion of sludge is always retained in the funnel-shaped area. Through the coordinated operation of the aeration pipeline and the mixer 8, uniform mixing of the bottom sludge and the upper water is promoted, replacing the traditional sludge return system.

[0048] The aeration pipeline includes an aeration main pipe 41 and aeration branch pipes 21. The aeration branch pipes 21 are located below the steel mixer support 22. The aeration branch pipes 21 are equipped with a manual valve 18 and an automatic valve 19. The aeration main pipe 41 is equipped with a manual valve 20.

[0049] The top of the device is equipped with a level gauge 6, an online pH monitoring system 7, an inlet branch pipe 2, a lime solution dosing pipeline 36, an acid dosing pipeline 37, a PAM dosing pipeline 38, a defluorinating agent dosing pipeline 39, and a PAC dosing pipeline 40.

[0050] The inlet branch pipe 2 is equipped with an inlet manual valve 3, an inlet automatic valve 4, and an inlet fluoride ion online monitoring device 5.

[0051] An overflow pipe 9 is provided on the upper side of the device body; a fluoride ion sampling tube 16 is connected to the middle side of the device body, and a fluoride ion sampling tube manual valve 13, a fluoride ion sampling tube automatic valve 14 and a fluoride ion online monitoring device 15 are provided on the fluoride ion sampling tube 16; an outlet pipe 10 is connected to the lower side of the device body 42; the position of the water inlet of the outlet pipe 10 is consistent with the cylindrical bottom of the device body to avoid sucking in bottom sludge, while ensuring that some sludge is always retained in the funnel-shaped area at the bottom of the device body 42.

[0052] The bottom of the device body is equipped with a sludge discharge branch pipe 23. The sludge discharge branch pipe 23 has a certain curvature inside the device body 42, and its bending radius is 5 to 8 times the pipe diameter to prevent sludge blockage. The sludge discharge branch pipe 23 is equipped with a manual valve 24 and an automatic valve 25. The end of the sludge discharge branch pipe 23 is connected to the sludge discharge main pipe 35. The sludge discharge main pipe 35 is connected to the sludge discharge pump 29 through the sludge discharge pump inlet pipe 28. The sludge discharge pump inlet pipe 28 is equipped with a manual valve 26 and a flexible connection 27. The outlet of the sludge discharge pump 29 is connected to the sludge discharge pump outlet pipe 30. The sludge discharge pump outlet pipe 30 is equipped with a sludge discharge pump outlet pipe pressure monitoring device 31, a flexible connection 32, a check valve 33, and an automatic valve 34.

[0053] like Figure 5 As shown, the top of the device body 42 is equipped with a maintenance platform and guardrail 44, and the side of the device body 42 is equipped with a steel ladder 45. Operators can climb to the top of the device body 42 via the ladder 45 to carry out inspection work; the side of the device body 42 is equipped with a manhole 43.

[0054] The operating principle of this device is as follows:

[0055] To ensure stable system operation and effectively respond to sudden changes in water volume, fluoride-containing wastewater treatment systems are generally designed to consist of at least two main units 42 and their supporting facilities to achieve continuous water intake.

[0056] During normal operation, the manual inlet valve 3 on the inlet branch pipe 2 is normally open; the automatic inlet valve 4 is opened or closed according to the monitoring of the level gauge 6; the fluoride-containing wastewater enters the system through the main inlet pipe 1 and enters the device body 42 through the inlet branch pipe 2.

[0057] The manual valve 18 on the aeration branch pipe 21 is normally open. Based on the monitoring results of the fluoride ion concentration and pH of the influent fluoride ion online monitoring device 5 on the influent branch pipe 2 and the pH online monitoring system 7 on the device body 42, the lime solution dosing pipe 36 is opened to add lime solution into the device body 42. At the same time, the mixer 8 and the automatic valve 19 of the aeration branch pipe are opened. The speed of the mixer 8 is adjusted to carry out rapid stirring, which, together with aeration, promotes the thorough mixing of lime solution and water. The pH value of the water in the device body 42 is controlled to reach the set range, and lime reacts with fluoride ions in sewage to form CaF2 precipitate.

[0058] Open the acid dosing tube 37 and add acid into the device body 42 to adjust the pH to neutral.

[0059] Turn on the PAC dosing pipe 40 and add PAC (polyaluminum chloride) into the device body 42 to promote a coagulation reaction in the water.

[0060] Open the PAM dosing pipe 38 and add PAM (polyacrylamide) into the device body 42. At the same time, close the automatic valve 19 of the aeration branch pipe and reduce the speed of the mixer 8 to stir slowly. With the function of the baffle 17, the tiny flocs generated by the coagulation reaction are further aggregated and enlarged, improving the solid-liquid separation effect.

[0061] After the water in the device body 42 has reacted completely, turn off the agitator 8 and allow it to settle.

[0062] The manual valve 13 of the fluoride ion sampling tube 16 is normally open. After the water in the device body 42 has been statically settled for a certain period of time, the automatic valve 14 of the fluoride ion sampling tube is opened, and the concentration of fluoride ions in the water is detected by the online fluoride ion monitoring device 15. At this time, the concentration of fluoride ions is ≤10mg / L.

[0063] If the emission requirement limits the fluoride ion concentration to ≤10mg / L, the manual valve 12 on the outlet pipe 10 is normally open. At this time, the automatic valve 11 can be opened to discharge the supernatant.

[0064] Once the supernatant is discharged to the limit level through the outlet pipe 10, the sludge discharge pump 29 is turned on. The manual valve 24 of the sludge discharge branch pipe and the manual valve 26 of the sludge discharge pump inlet pipe are normally open. At the same time, the automatic valve 25 of the sludge discharge branch pipe and the automatic valve 34 of the sludge discharge pump outlet pipe are turned on in sequence to pump the sludge into the subsequent sludge treatment system. After the sludge discharge pump 29 has been running for a certain period of time, it is turned off to ensure that a certain amount of sludge remains in the funnel area at the bottom of the device body 42.

[0065] In some embodiments, if the emission standard further tightens the limit value of fluoride ion concentration, before opening the fluoride ion sampling tube and taking samples, the defluorinating agent dosing tube 39 is opened, and different doses of defluorinating agent are added according to the different emission standard limits. At the same time, the agitator 8 is turned on to slowly stir, and the baffle 17 is used to promote the reaction of trace fluoride ions in the water with the defluorinating agent, thereby further reducing the fluoride ion concentration.

[0066] After the water in the device body 42 has completely reacted with the defluoridating agent, turn off the agitator 8 and allow it to settle.

[0067] After the water in the device body 42 has settled for a certain period of time, the automatic valve 14 of the fluoride ion sampling tube is opened, and the concentration of fluoride ions in the water is detected by the online fluoride ion monitoring device 15. Once the fluoride ion concentration meets the limit value of the discharge requirements, the operation can be repeated to discharge the supernatant and sludge.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device, characterized in that, It includes an integrated device body, the upper part of which is cylindrical and the lower part is funnel-shaped; The device body is internally equipped with: A mixer is used to mix wastewater and chemicals; A steel mixer support frame is located inside the lower part of the device body to support the mixer; An aeration pipe is installed below the mixer support to promote mixing and flocculation; A baffle plate is installed on the upper inner wall of the device body to improve sedimentation efficiency and optimize water flow distribution; The device body is provided with: A level gauge is used to monitor water levels; pH online monitoring system is used to monitor the pH value of water bodies; The inlet pipeline is equipped with a manual inlet valve, an automatic inlet valve, and an online fluoride ion monitoring device for introducing fluoride-containing wastewater. The lime solution dosing pipeline, acid dosing pipeline, PAM dosing pipeline, defluorinating agent dosing pipeline, and PAC dosing pipeline are all located on the top of the device body and are used to add treatment agents; An overflow pipe is installed on the upper side of the device body to control the liquid level and discharge excess water. A fluoride ion sampling pipeline is installed on the side of the middle section of the device body. The fluoride ion sampling pipeline is equipped with a manual valve, an automatic valve, and an online fluoride ion monitoring device for detecting the fluoride ion concentration in the water. The water outlet pipe is located on the lower side of the device body. The water outlet pipe is equipped with a manual water outlet valve and an automatic water outlet valve for discharging the treated supernatant. A sludge discharge pipeline is located at the bottom of the device body and connected to a sludge discharge pump for discharging sludge.

2. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The aeration pipeline includes a main aeration pipe and a branch aeration pipe. A manual valve is installed on the main aeration pipe, and a manual valve and an automatic valve are installed on the branch aeration pipe. The branch aeration pipe is connected to the main body of the device.

3. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The sludge discharge pipeline is equipped with a manual sludge discharge valve and an automatic sludge discharge valve. The sludge inlet pipeline of the sludge discharge pump is equipped with a manual valve and a flexible connection. The sludge outlet pipeline of the sludge discharge pump is equipped with a flexible connection, a check valve, an automatic valve, and a pressure monitoring device.

4. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The mixer is equipped with multiple layers of upward-lifting blades to improve the uniformity of mixing between the wastewater and the reagent at the bottom.

5. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The water inlet of the outlet pipe is positioned at the same level as the cylindrical bottom of the device body to prevent the intake of bottom sludge.

6. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The sludge discharge pipe has an arc inside the device body, with a bending radius of 5 to 8 times the pipe diameter, to prevent sludge blockage.

7. The sequencing batch reactor (SBR) integrated fluoride-containing wastewater treatment device according to claim 1, characterized in that: The device body is equipped with a maintenance platform and guardrail on the top, and a steel ladder and manhole on the side for easy inspection and maintenance.

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