An activated alumina defluorination device and regeneration and regeneration waste liquid treatment method

Abstract

The present invention relates to the technical field of waste liquid treatment, specifically to an activated alumina defluorination device and a regeneration and regeneration waste liquid treatment method, comprising a treatment tank, an addition component, a control component and a balance component. A circulation component is horizontally arranged at the upper end of the treatment tank, and the circulation component comprises a circulation control box, a circulation lifting cylinder and a mounting beam. When the regeneration agent is input, the control component cooperates with a pressure screw to perform efficient filling and input, thereby improving the mixing reaction efficiency between the agent and the wastewater. The secondary backwashing / rinsing adopts a cycle, which can effectively reduce the amount of waste liquid generated and ensure the backwashing / rinsing effect. At the same time, when the pressure screw is used, it can cooperate with a cleaning brush disc to automatically clean the filter plate arranged in the circulation component, thereby reducing the equipment maintenance and use costs. In addition, the addition component and the circulation component are independently driven, thereby shortening the time consumed by adding medicine and waste liquid treatment, reducing invalid waiting time and improving efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of waste liquid treatment, and in particular to an activated alumina defluorination device and a regeneration and regeneration waste liquid treatment method. Background Art

[0002] The activated alumina method is the most widely used and mature defluoridation method in the world. It has been widely used in the defluoridation of groundwater and drinking water. However, in industrial wastewater, due to the high concentration of fluoride and the short adsorption saturation time, it requires more frequent regeneration and produces a large amount of regeneration waste liquid.

[0003] The current regeneration process is inefficient and incomplete, which affects the reuse of activated alumina filter media. At the same time, the collection and treatment of regeneration waste liquid is poor, resulting in a large amount of fluoride ions re-entering the treatment system, increasing the system processing load or direct discharge, causing secondary environmental pollution. Summary of the invention

[0004] The object of the present invention is to provide an activated alumina defluorination device and a regeneration and regeneration waste liquid treatment method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an activated alumina defluorination device, the activated alumina defluorination device comprising:

[0006] A treatment pool, wherein a circulation assembly is horizontally arranged at the upper end of the treatment pool, and the circulation assembly includes a circulation control box, a circulation lifting cylinder and a mounting beam;

[0007] An adding component is horizontally arranged at the lower end of the center of the treatment pool, and the adding component includes a central turntable, a pulling table and a pressurizing screw, and the upper end of the pulling table is movably connected to the lower end of the circulating lifting cylinder;

[0008] A control component, wherein the control component is arranged at the lower end of the circulating lifting cylinder;

[0009] A balancing component is horizontally arranged on one side of the pressure spiral, and the balancing component includes a sliding ring and a sliding rail sleeve.

[0010] Preferably, a plurality of mounting beams are horizontally symmetrically arranged on four sides of the circulation control box, and the plurality of mounting beams are horizontally plugged into one side of the treatment pool respectively. The circulation lifting cylinder is vertically connected to the center of the lower end of the circulation control box, and a plurality of circulation return water sprinkler heads are connected to the lower end of the mounting beam.

[0011] Preferably, a control groove is opened at the lower end of the circulating lifting cylinder, a filter plate is horizontally inserted on one side of the circulating lifting cylinder connected to the control groove, the pulling platform is movably arranged in the center of the control groove, a cleaning brush plate is horizontally arranged at the upper end of the pulling platform, and a number of bristles on the upper end of the cleaning brush plate are respectively arranged in contact with the lower end of the filter plate when the pulling platform is raised.

[0012] Preferably, a plurality of strip grooves are horizontally symmetrically provided on four sides of the control groove, telescopic push rods are vertically provided in the plurality of strip grooves, the pulling platform is arranged in a disc structure, a lifting ring is provided on one side of the outer circumference of the pulling platform through a bearing movable sleeve, a plurality of lifting arms are horizontally symmetrically provided on one side of the outer circumference of the lifting ring, the plurality of lifting arms are respectively penetrated through the plug-in strip grooves, and the upper ends of the plurality of telescopic push rods are respectively connected to the lower end of one side of the lifting arm penetrating the strip groove.

[0013] Preferably, a connecting beam is vertically provided at the upper end of the central turntable, and the upper end of the connecting beam is connected to the lower end of the pulling platform. A plurality of driving teeth are arranged around the upper end of the central turntable. The control component includes a power gear, which is arranged on one side of the lower end of the control groove, and the lower end of the power gear is meshed and connected with one side of the driving teeth.

[0014] Preferably, a bearing seat is provided at the center of the lower end of the treatment pool, and a medicine connecting cylinder is vertically inserted into the center of the upper end of the bearing seat through a bearing. A piston groove is provided in the medicine connecting cylinder, and a medicine liquid inlet pipe is vertically provided at the lower end of the treatment pool. The upper end of the medicine liquid inlet pipe is movably inserted into the lower end of the medicine connecting cylinder through a sealing bearing, and the medicine liquid inlet pipe is connected to the piston groove.

[0015] Preferably, a piston column is vertically provided at the lower end of the rotating disk, and the lower end of the piston column movably passes through the upper end of the medicine connecting cylinder and is inserted into the piston groove and is sleeved with a sealing piston. The piston column is a prismatic structure, and a cavity is opened in the center of the rotating disk, and the cavity passes through the piston column and is connected to the piston groove.

[0016] Preferably, the pressurizing spiral is arranged in a spiral disk structure, one side of the pressurizing spiral is connected to the cavity of the rotating disk, the sliding ring is horizontally arranged on the outside of the pressurizing spiral, the sliding rail sleeve is movably connected to the sliding ring, an annular groove is opened on one side of the sliding rail sleeve, and the annular groove is inserted through one side of the pressurizing spiral, and a number of dosing holes are symmetrically opened on the upper and lower sides of the pressurizing spiral.

[0017] Preferably, a plurality of stabilizing guide rods are vertically symmetrically provided at the lower end of the sliding rail sleeve, a plurality of stabilizing rod sleeves are vertically symmetrically provided at the lower end of the treatment pool, and the lower ends of the plurality of stabilizing guide rods are respectively and vertically movably plugged into the upper ends of the stabilizing rod sleeves.

[0018] An activated alumina filter material regeneration and regeneration waste liquid treatment method, applied to the above-mentioned activated alumina defluorination device, comprises the following steps:

[0019] Step 1: One backwash, the filter layer expansion rate is 30-50%, the backwash time is 10-15 minutes, the flushing intensity is 12-16L / ㎡·s, and the backwash water can be directly returned to the front end of the system or the general backwash collection tank. After one backwash is completed, all the liquid in the filter tank is emptied, and the emptying pipeline is designed to take no more than 30 minutes.

[0020] Step 2: Use 1% sodium hydroxide for regeneration, the amount of regeneration liquid is 3 to 6 times the volume of the filter material, generally not less than 4 times;

[0021] Step 3: The chemical pump should be used for equipment. The chemical pump flow rate is required to be able to pump the chemical into the filter tank that needs to be regenerated within 30 minutes. If necessary, the standby pump can be turned on. The flow rate design of the pipeline chemical pump is fully open;

[0022] The reagent enters the piston groove from the liquid inlet pipe, and enters the pressurizing screw set in the volute structure through the cavity, and is evenly and efficiently delivered into the wastewater from several dosing holes at the upper and lower ends of the pressurizing screw. At the same time, the power gear drives the middle turntable to rotate, driving the pressurizing screw to rotate along the sliding rail sleeve to achieve the purpose of efficient mixing;

[0023] During this period, the telescopic push rod drives the pulling table to rise, which does not affect the normal operation of the pressure screw. At the same time, the bristles on the cleaning brush plate clean the lower end of the filter plate.

[0024] Step 4: After all the reagents are quantitatively injected into the filter tank, the reagent circulation begins. The circulation pump can be set separately for each filter tank, or only one group can be set for sharing. The flow rate of the circulation pump is set at 1 / 2 of the filter tank design filtration rate. The equipment uses a pump. If necessary, the flow rate of the circulation pump can be appropriately adjusted to obtain a better regeneration effect.

[0025] The circulation pump in the circulation control box lifts the wastewater from one side of the filter plate, and then discharges it into the treatment tank from the mounting beam and several circulation return water sprinkler heads to achieve the purpose of wastewater circulation and mixing. The cleaning function of the cleaning brush plate improves the efficiency of wastewater lifting and the service life of the circulation pump.

[0026] Step 5: Set up an online fluoride detection instrument at the outlet of the regeneration circulation pump, or set up a sampling port for manual sampling, and determine the circulation end point based on the fluoride concentration of the circulating fluid;

[0027] Step 6: After the cycle is completed, the reagent is discharged into a special regeneration waste liquid collection pool through the emptying pipeline. The regeneration waste liquid collection pool is required to be able to accept waste liquid generated by no less than 2 regeneration processes;

[0028] Step 7: After the regeneration solution in the filter tank is emptied, a secondary backwash or elution operation is performed. After the clean water with the same amount of regeneration solution is pumped into the filter tank, the regeneration solution circulation pump is turned on to perform a secondary backwash or elution operation. The backwash intensity or elution speed is set to 1 / 2 of the designed filtration speed. The fluoride concentration of the backwash / elution solution is measured to determine the secondary backwash / elution endpoint;

[0029] Step 8: The secondary backwash / rinsing operation can be performed in multiple times, and the total water consumption of the secondary backwash / rinsing shall not exceed 2 times the amount of regeneration liquid;

[0030] Step 9: Use sodium hydroxide as the regeneration agent. Neutralization should be carried out after the secondary backwash (or elution). Neutralization can be carried out by using 1% sulfuric acid solution to adjust the pH value of the inlet water to about 3. The inlet water flow rate is the same as the normal defluorination process. The neutralization time is 1 to 2 hours, until the pH value of the outlet water drops to 8 to 9;

[0031] Step 10: The regeneration reagent, secondary backwashing / rinsing and neutralization drainage are collected as regeneration waste liquid into the regeneration waste liquid pool;

[0032] Step 11: Raw water can be used for the first backwash, the second backwash, the rinse and the preparation of the regeneration solution;

[0033] Step 12: The regeneration waste liquid pool is designed to accommodate the waste liquid of two regeneration processes, at least 1.5 times the volume. The treatment capacity of the regeneration waste liquid treatment system is designed to treat all the regeneration waste liquid within 8 hours;

[0034] Step 13: The regeneration waste liquid treatment device is designed as a two-stage coagulation and sedimentation device, and the reagent used is calcium chloride. In order to reduce the operating cost, calcium chloride + lime compound can also be used. The first-stage reaction tank adopts a mechanical acceleration clarification tank design, which can reduce the amount of dosing. After the primary reaction of sodium hydroxide regeneration, it is necessary to add acid to adjust the pH before the second-stage reaction precipitation. The sedimentation tank can adopt an inclined tube sedimentation tank with a surface load of no more than 4m / h. The sludge generated by the regeneration waste liquid treatment should be collected and treated separately, and the filtrate generated should be returned to the regeneration waste liquid tank for treatment.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] By controlling the components to cooperate with the pressurized screw during the input of the regeneration agent, efficient filling and input can be achieved, thereby improving the efficiency of the mixing reaction between the drug and the wastewater. The secondary backwashing / rinsing adopts a cycle, which can effectively reduce the amount of waste liquid generated and ensure the backwashing / rinsing effect. At the same time, when the pressurized screw is used, the cleaning brush plate can be used to automatically clean the filter plate set in the circulation component, thereby reducing the maintenance and use costs of the equipment. In addition, the addition component and the circulation component are driven independently, which shortens the time consumed by dosing and waste liquid treatment, reduces invalid waiting time, and improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the structure of the present invention;

[0038] Figure 2 For the present invention Figure 1 Schematic diagram of part A;

[0039] Figure 3 For the present invention Figure 1 Schematic diagram of part B;

[0040] Figure 4 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0041] Figure 5 It is a schematic diagram of the rotary disk connection structure in the present invention;

[0042] Figure 6 This is a schematic diagram of the connection structure of the medicine connecting tube of the present invention;

[0043] Figure 7 This is a schematic diagram of the local structure of the circulating lifting cylinder of the present invention;

[0044] Figure 8 The figure is a process flow chart of the treatment method of the present invention.

[0045] In the figure: treatment tank 1, circulation control box 2, mounting beam 3, circulation lifting cylinder 4, circulation return water sprinkler head 5, pulling table 7, filter plate 8, cleaning brush plate 9, lifting ring 10, lifting arm 11, strip groove 12, telescopic push rod 13, turntable 15, driving teeth 16, power gear 17, drug connecting cylinder 18, piston column 19, sealing piston 20, pressurizing spiral 21, sliding ring 22, sliding rail sleeve 23, stabilizing rod sleeve 24, stabilizing guide rod 25, dosing hole 26, and liquid inlet pipe 27. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Please refer to the attached Figure 1-8 , this application provides the following five preferred embodiments.

[0048] Embodiment 1

[0049] An activated alumina defluorination device, characterized in that: the activated alumina defluorination device comprises:

[0050] A treatment pool 1, wherein a circulation assembly is horizontally arranged at the upper end of the treatment pool 1, and the circulation assembly includes a circulation control box 2 and a mounting beam 3, a plurality of mounting beams 3 are horizontally and symmetrically arranged on four sides of the circulation control box 2, and the plurality of mounting beams 3 are horizontally plugged into one side of the treatment pool 1 respectively, and the mounting beams 3 are vertically connected to the center of the lower end of the circulation control box 2, and a plurality of circulation return water sprinkler heads 5 are connected at the lower end of the mounting beams 3;

[0051] An adding component is horizontally arranged at the lower end of the center of the treatment pool 1. The adding component includes a central rotating disk 15, a pulling platform 7 and a pressurizing screw 21, and the upper end of the pulling platform 7 is movably plugged into the lower end of the circulating lifting cylinder 4. A control groove is provided at the lower end of the circulating lifting cylinder 4. A filter plate 8 is horizontally plugged into the circulating lifting cylinder 4 on one side of the control groove. The pulling platform 7 is movably plugged into the center of the control groove. A plurality of strip grooves 12 are horizontally symmetrically provided on four sides of the control groove. Telescopic push rods 13 are vertically provided in the plurality of strip grooves 12. The pulling platform 7 is a disc structure. A lifting ring 10 is movably sleeved on one side of the outer circumference of the pulling platform 7 through a bearing. A plurality of lifting arms 11 are horizontally symmetrically provided on one side of the outer circumference of the lifting ring 10. The plurality of lifting arms 11 are respectively inserted through the plug-in strip grooves 12, and the upper ends of the plurality of telescopic push rods 13 are respectively connected to the lower ends of the lifting arms 11 passing through the strip grooves 12.

[0052] The control component is arranged at the lower end of the circulating lifting cylinder 4. A connecting beam is vertically arranged at the upper end of the middle rotating disk 15. The upper end of the connecting beam is connected to the lower end of the pulling platform 7. A plurality of driving teeth 16 are arranged around the upper end of the middle rotating disk 15. The control component includes a power gear 17. The power gear 17 is arranged at one side of the lower end of the control groove. The lower end of the power gear 17 is meshed and connected with one side of the driving teeth 16.

[0053] A balancing component is horizontally arranged on one side of the pressurizing screw 21, and the balancing component includes a sliding ring 22 and a sliding rail sleeve 23. A bearing seat is provided at the center of the lower end of the treatment tank 1, and a medicine connecting cylinder 18 is vertically inserted through a bearing at the center of the upper end of the bearing seat. A piston groove is provided in the medicine connecting cylinder 18, and a medicine liquid inlet pipe 27 is vertically provided at the lower end of the treatment tank 1. The upper end of the medicine liquid inlet pipe 27 is movably inserted into the lower end of the medicine connecting cylinder 18 through a sealing bearing, and the medicine liquid inlet pipe 27 is connected to the piston groove.

[0054] An activated alumina filter material regeneration and regeneration waste liquid treatment method, applied to the above-mentioned activated alumina defluorination device, comprises the following steps:

[0055] Step 1: One backwash, the filter layer expansion rate is 30-50%, the backwash time is 10-15 minutes, the flushing intensity is 12-16L / ㎡·s, and the backwash water can be directly returned to the front end of the system or the general backwash collection tank. After one backwash, all the liquid in the filter tank is drained, and the drain pipe is designed with a drain time of no more than 30 minutes.

[0056] Step 2: Use 1% sodium hydroxide for regeneration, the amount of regeneration liquid is 3 to 6 times the volume of the filter material, generally not less than 4 times;

[0057] Step 3: The chemical pump should be used for equipment. The chemical pump flow rate is required to be able to pump the chemical into the filter tank that needs to be regenerated within 30 minutes. If necessary, the standby pump can be turned on. The flow rate design of the pipeline chemical pump is fully open;

[0058] The medicine enters the piston groove from the medicine liquid inlet pipe 27, and enters the pressurizing screw 21 set in the volute structure through the cavity, and is evenly and efficiently delivered into the wastewater from the several dosing holes 26 at the upper and lower ends of the pressurizing screw 21. At the same time, the power gear 17 drives the middle turntable 15 to rotate, driving the pressurizing screw 21 to rotate along the sliding rail sleeve 23, so as to achieve the purpose of efficient mixing;

[0059] During this period, the telescopic push rod 13 drives the pulling platform 7 to rise, without affecting the normal operation of the pressure screw 21, while the bristles on the cleaning brush plate 9 clean the lower end of the filter plate 8;

[0060] Step 4: After all the reagents are quantitatively injected into the filter tank, the reagent circulation begins. The circulation pump can be set separately for each filter tank, or only one group can be set for sharing. The flow rate of the circulation pump is set at 1 / 2 of the filter tank design filtration rate. The equipment uses a pump. If necessary, the flow rate of the circulation pump can be appropriately adjusted to obtain a better regeneration effect.

[0061] The circulation pump in the circulation control box 2 lifts the wastewater from one side of the filter plate 8, and then discharges it into the treatment tank 1 from the mounting beam 3 and a number of circulation return water sprinkler heads 5, so as to achieve the purpose of wastewater circulation and mixing, and the cleaning effect of the cleaning brush plate 9 improves the efficiency of wastewater lifting and the service life of the circulation pump;

[0062] Step 5: Set up an online fluoride detection instrument at the outlet of the regeneration circulation pump, or set up a sampling port for manual sampling, and determine the circulation end point based on the fluoride concentration of the circulating fluid;

[0063] Step 6: After the cycle is completed, the reagent is discharged into a special regeneration waste liquid collection pool through the emptying pipeline. The regeneration waste liquid collection pool is required to be able to accept waste liquid generated by no less than 2 regeneration processes;

[0064] Step 7: After the regeneration solution in the filter tank is emptied, perform a secondary backwash or elution operation. After pumping clean water equal to the amount of regeneration solution into the filter tank, start the regeneration solution circulation pump and perform a secondary backwash or elution operation. The backwash intensity or elution speed is set to 1 / 2 of the designed filtration speed. Measure the fluoride concentration of the backwash / elution solution to determine the secondary backwash / elution endpoint;

[0065] Step 8: The secondary backwash / rinsing operation can be performed in multiple times, and the total water consumption of the secondary backwash / rinsing shall not exceed 2 times the amount of regeneration liquid;

[0066] Step 9: Use aluminum sulfate as the regeneration agent. The pH value of the effluent at the end of the secondary backwash should be greater than 6.5, and the fluoride content should be less than 1 mg / L.

[0067] Step 10: Use sodium hydroxide as the regeneration agent, and neutralize after the secondary backwash (or elution). Neutralization can be done by using 1% sulfuric acid solution to adjust the pH value of the inlet water to about 3. The inlet flow rate is the same as the normal defluorination process, and the neutralization time is 1 to 2 hours, until the pH value of the outlet water drops to 8 to 9;

[0068] Step 11: The regeneration reagent, secondary backwashing / rinsing and neutralization drainage are collected as regeneration waste liquid into the regeneration waste liquid pool;

[0069] Step 12: Raw water can be used for the first backwash, second backwash, rinsing and preparation of regeneration solution;

[0070] Step 13: The regeneration waste liquid pool is designed to accommodate the waste liquid of two regeneration processes, which should be at least 1.5 times the volume. The treatment capacity of the regeneration waste liquid treatment system is designed to treat all the regeneration waste liquid within 8 hours;

[0071] Step 14: The regeneration waste liquid treatment device is designed as a two-stage coagulation sedimentation device, and the reagent used is calcium chloride. In order to reduce the operating cost, calcium chloride + lime compound can also be used. The first-stage reaction tank adopts a mechanical acceleration clarification tank design, which can reduce the dosage. After the first-stage reaction of sodium hydroxide regeneration, it is necessary to add acid to adjust the pH before the second-stage reaction precipitation. The sedimentation tank can use an inclined tube sedimentation tank with a surface load of no more than 4m / h. The sludge generated by the regeneration waste liquid treatment should be collected and treated separately, and the filtrate generated should be returned to the regeneration waste liquid tank for treatment.

[0072] An activated alumina defluorination device disclosed in Example 2 of the present invention has a structure that is basically the same as that in Example 1, with the difference being that a cleaning brush plate 9 is horizontally provided at the upper end of a pulling table 7, and when the pulling table 7 is raised, a number of bristles on the upper end of the cleaning brush plate 9 are respectively arranged in contact with the lower end of a filter plate 8. When the pulling table 7 rotates along with the turntable 15, the cleaning brush plate 9 automatically cleans the filter plate 8, thereby improving the use effect and service life of the filter plate 8.

[0073] An activated alumina defluorination device disclosed in Example 3 of the present invention has a structure that is basically the same as that in Example 2, except that a piston column 19 is vertically provided at the lower end of the central rotating disk 15, and the lower end of the piston column 19 movably penetrates the upper end of the drug connecting cylinder 18 and is inserted into the piston groove and is sleeved with a sealing piston 20. The piston column 19 is a prismatic structure, and a cavity is opened in the center of the central rotating disk 15, and the cavity penetrates the piston column 19 and is connected to the piston groove. When the drug is delivered, the normal rotation of the pressurizing screw 21 is not affected.

[0074] An activated alumina defluorination device disclosed in Example 4 of the present invention has a structure that is basically the same as that in Example 3, except that: the pressure spiral 21 is arranged in a spiral disk structure, one side of the pressure spiral 21 is connected to the cavity of the rotating disk 15, the sliding ring 22 is horizontally arranged on the outside of the pressure spiral 21, the sliding rail sleeve 23 is movably connected to the sliding ring 22, an annular groove is provided on one side of the sliding rail sleeve 23, one side of the pressure spiral 21 is penetrated and connected to the annular groove, and a plurality of dosing holes 26 are symmetrically provided on the upper and lower sides of the pressure spiral 21, which serves the purpose of evenly filling the medicine and accelerating the mixing of the medicine when the pressure spiral 21 rotates.

[0075] An activated alumina defluorination device disclosed in Example 5 of the present invention has a structure that is basically the same as that in Example 4, except that: a plurality of stabilizing guide rods 25 are vertically symmetrically provided at the lower end of the sliding rail sleeve 23, and a plurality of stabilizing rod sleeves 24 are vertically symmetrically provided at the lower end of the treatment pool 1, and the lower ends of the plurality of stabilizing guide rods 25 are respectively vertically movably inserted into the upper ends of the stabilizing rod sleeves 24, so as to provide balanced support for the rotation of the pressurizing screw 21 and improve the drug filling strength of the pressurizing screw 21.

[0076] When in use, the filter layer is backwashed once, the filter layer expansion rate is 30-50%, the backwashing time is 10-15 minutes, the flushing intensity is 12-16L / ㎡·s, and the backwashing water can be directly returned to the front end of the system or the general backwashing sump. After one backwash, the liquid in the filter tank is completely drained, and the emptying pipeline is designed according to the emptying time of no more than 30 minutes. 1% sodium hydroxide is used for regeneration, and the amount of regeneration liquid is 3-6 times the volume of the filter material, generally not less than 4 times. The chemical pump should be used for equipment, and the chemical pump flow rate is required to be able to inject the chemical into the filter that needs to be regenerated within 30 minutes. The filter tank can be opened with a standby pump when necessary. The flow design of the pipeline medicine pump is fully opened. The medicine enters the piston groove from the medicine liquid inlet pipe 27, and enters the pressurizing screw 21 set in the volute structure through the cavity. It is evenly and efficiently fed into the wastewater from a number of dosing holes 26 at the upper and lower ends of the pressurizing screw 21. At the same time, the power gear 17 drives the turntable 15 to rotate, driving the pressurizing screw 21 to rotate along the sliding rail sleeve 23 to achieve the purpose of efficient mixing. During this period, the telescopic push rod 13 drives the pulling table 7 to rise, which does not affect the normal operation of the pressurizing screw 21. At the same time, the bristles on the cleaning brush plate 9 are brushed against the filter plate 8. The end is cleaned and treated. After the reagent is quantitatively injected into the filter tank, the reagent circulation begins. The circulation pump can be set separately for each filter tank, or only one group can be set for common use. The circulation pump flow is set according to 1 / 2 of the filter tank design filtration rate. The equipment uses a pump. If necessary, the circulation pump flow can be appropriately adjusted to obtain a better regeneration effect. The circulation pump in the circulation control box 2 lifts the wastewater from one side of the filter plate 8, and then discharges it into the treatment tank 1 from the mounting beam 3 and several circulation return water sprinkler heads 5 to achieve the purpose of wastewater circulation and mixing. The cleaning effect of the cleaning brush plate 9 improves the efficiency of wastewater lifting and the use of the circulation pump. During the service life, an online fluoride detection instrument is installed at the outlet of the regeneration circulation pump, or a sampling port is set for manual sampling. The circulation end point is determined according to the fluoride concentration of the circulating liquid. After the circulation is completed, the agent is discharged to a special regeneration waste liquid collection pool through the emptying pipeline. The regeneration waste liquid collection pool is required to be able to accept waste liquid generated by no less than 2 regeneration processes. After the regeneration solution in the filter tank is emptied, a secondary backwash or elution operation is carried out. After clean water with an amount of regeneration liquid is pumped into the filter tank, the regeneration liquid circulation pump is turned on for a secondary backwash or elution operation. The backwash intensity or elution speed is set at 1 / 2 of the design filtration rate. Determine the fluoride concentration of the backwash / rinsing liquid and determine the secondary backwash / rinsing endpoint. The secondary backwash / rinsing operation can be performed in multiple times. The total water consumption of the secondary backwash / rinsing should not be more than 2 times the amount of regeneration liquid. Aluminum sulfate is used as the regeneration agent. The pH value of the effluent at the secondary backwash endpoint should be greater than 6.5, and the fluoride content should be less than 1 mg / L. Sodium hydroxide is used as the regeneration agent. Neutralization should be carried out after the secondary backwash (or rinsing).Neutralization can use 1% sulfuric acid solution to adjust the pH value of the inlet water to about 3. The inlet flow rate is the same as the normal defluorination process. The neutralization time is 1 to 2 hours, until the pH value of the outlet water drops to 8 to 9. The regeneration agent, secondary backwashing / rinsing and neutralization drainage are all collected as regeneration waste liquid in the regeneration waste liquid pool. The first backwashing, secondary backwashing, rinsing and preparation of regeneration solution can all use raw water. The regeneration waste liquid pool is designed to accommodate the volume of waste liquid from two regeneration processes, at least 1.5 times. The processing capacity of the regeneration waste liquid treatment system is required to treat all regeneration waste liquid within 8 hours. The design of raw waste liquid treatment is completed, and the regeneration waste liquid treatment device is designed according to two-stage coagulation and sedimentation. The reagent used is calcium chloride. In order to reduce the operating cost, calcium chloride + lime compound can also be used. The first-stage reaction tank adopts a mechanical acceleration clarification tank design, which can reduce the amount of dosing. After the primary reaction of sodium hydroxide regeneration, it is necessary to add acid to adjust the pH before the second-stage reaction precipitation. The sedimentation tank can adopt an inclined tube sedimentation tank with a surface load of no more than 4m / h. The sludge generated by the regeneration waste liquid treatment should be collected and treated separately, and the filtrate generated should be returned to the regeneration waste liquid tank for treatment.

[0077] An online fluoride meter is installed on the reagent circulation pipeline. The circulation end point is determined based on the test results. Automatic valves are installed at the inlet, outlet and drain port of the dosing pump and the system is automatically controlled according to the PLC program.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An activated alumina defluorination device, Features: The activated alumina defluorination device comprises: A treatment pool (1), wherein a circulation assembly is horizontally arranged at the upper end of the treatment pool (1), and the circulation assembly comprises a circulation control box (2), a circulation lifting cylinder (4) and a mounting beam (3); An adding component is horizontally arranged at the lower end of the center of the treatment pool (1), and the adding component comprises a central rotating disk (15), a pulling table (7) and a pressure screw (21), and the upper end of the pulling table (7) is movably connected to the lower end of the circulating lifting cylinder (4); A control component, the control component being arranged at the lower end of the circulating lifting cylinder (4); A balancing component, the balancing component is horizontally arranged on one side of the pressure screw (21), and the balancing component comprises a sliding ring (22) and a sliding rail sleeve (23); The circulation control box (2) is horizontally symmetrically provided with a plurality of mounting beams (3) on four sides, and the plurality of mounting beams (3) are respectively horizontally plugged into one side of the treatment pool (1). The circulation lifting cylinder (4) is vertically connected and arranged at the center of the lower end of the circulation control box (2), and the lower end of the mounting beam (3) is connected and provided with a plurality of circulation return water spray heads (5); A control groove is provided at the lower end of the circulating lifting cylinder (4), a filter plate (8) is horizontally inserted on one side of the circulating lifting cylinder (4) connected to the control groove, a pulling platform (7) is movably inserted in the center of the control groove, a cleaning brush plate (9) is horizontally provided at the upper end of the pulling platform (7), and a plurality of bristles at the upper end of the cleaning brush plate (9) are respectively arranged in contact with the lower end of the filter plate (8) when the pulling platform (7) is in the lifted state; A plurality of strip grooves (12) are horizontally symmetrically provided on four sides of the control groove, and telescopic push rods (13) are vertically provided in the plurality of strip grooves (12). The pulling platform (7) is a disc structure, and a lifting ring (10) is provided on one side of the outer circumference of the pulling platform (7) through a bearing sleeve, and a plurality of lifting arms (11) are horizontally symmetrically provided on one side of the outer circumference of the lifting ring (10), and the plurality of lifting arms (11) are respectively inserted through the plug-in strip grooves (12), and the upper ends of the plurality of telescopic push rods (13) are respectively connected to the lower ends of the lifting arms (11) on one side of the strip grooves (12) passing through; A connecting beam is vertically arranged at the upper end of the middle rotating disk (15), and the upper end of the connecting beam is connected to the lower end of the pulling platform (7). A plurality of driving teeth (16) are arranged around the upper end of the middle rotating disk (15). The control component includes a power gear (17). The power gear (17) is arranged at one side of the lower end of the control groove, and the lower end of the power gear (17) is meshed and connected with one side of the driving teeth (16); A bearing seat is provided at the center of the lower end of the treatment tank (1); a medicine connecting tube (18) is vertically inserted through a bearing at the center of the upper end of the bearing seat; a piston groove is provided in the medicine connecting tube (18); a medicine liquid inlet pipe (27) is vertically provided at the lower end of the treatment tank (1); the upper end of the medicine liquid inlet pipe (27) is movably inserted into the lower end of the medicine connecting tube (18) through a sealing bearing; and the medicine liquid inlet pipe (27) is connected to the piston groove; A piston column (19) is vertically arranged at the lower end of the central rotating disk (15), and the lower end of the piston column (19) movably penetrates the upper end of the medicine connecting tube (18) and is inserted into the piston groove and sleeved with a sealing piston (20). The piston column (19) is a prismatic structure, and a cavity is opened in the center of the central rotating disk (15), and the cavity penetrates the piston column (19) and is connected to the piston groove. The pressurizing screw (21) is arranged in a spiral disk structure, one side of the pressurizing screw (21) is connected to the cavity of the middle rotating disk (15), the sliding ring (22) is arranged horizontally on the outside of the pressurizing screw (21), the sliding rail sleeve (23) is movably connected to the sliding ring (22), one side of the sliding rail sleeve (23) is provided with an annular groove, one side of the pressurizing screw (21) is inserted through the annular groove, and a plurality of dosing holes (26) are symmetrically provided on the upper and lower sides of the pressurizing screw (21).

2. An activated alumina defluorination device according to claim 1, Features: A plurality of stabilizing guide rods (25) are vertically symmetrically arranged at the lower end of the sliding rail sleeve (23), a plurality of stabilizing rod sleeves (24) are vertically symmetrically arranged at the lower end of the treatment tank (1), and the lower ends of the plurality of stabilizing guide rods (25) are respectively and vertically movably plugged into the upper ends of the stabilizing rod sleeves (24).

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