A device and method for advanced defluorination of wastewater

Abstract

The application provides a device and method for deep fluorine removal of wastewater, comprising a purification tank, wherein a first feeding device for feeding a fluorine removal precipitant is arranged inside the purification tank, and the feeding device is used for realizing precipitation purification of the wastewater; an adsorption purification device is further arranged inside the purification tank, and the adsorption purification device is located at a position close to the top in the purification tank and rotates around the axis of the purification tank; the adsorption purification device comprises a flow guide device, the flow guide device has a first flow guide end and a second flow guide end, and a storage device for storing adsorption materials is arranged outside the second flow guide end. The device occupies a small volume, the purification process is simple to operate, the wastewater purification efficiency is high, and the fluorine ion concentration in the wastewater can be quickly reduced to below 5 mg / I.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a device and method for deep defluorination of wastewater. Background Technology

[0002] Some companies combine the two methods to achieve deep purification of wastewater, reducing the fluoride ion concentration in wastewater from 20 mg / L to below 5 mg / L. The mechanisms for removing fluoride ions by chemical precipitation and adsorption are different, requiring the introduction of treatment media at different stages of wastewater treatment.

[0003] Typically, a composite agent such as lime and aluminum salt is first added to chemically settle the wastewater, and then adsorption materials are added to the settled wastewater for adsorption treatment. The traditional treatment process is carried out in different purification rooms, which requires a large space. In addition, the precipitates generated in the first stage need to be deeply removed to avoid affecting the adsorption materials. The above operations need to be carried out in different locations, making the operation process complicated and affecting the purification efficiency of fluoride ions in the wastewater. Summary of the Invention

[0004] To address the above problems, this invention provides a device and method for deep defluorination of wastewater. The device occupies a small volume, the purification process is simple to operate, and the wastewater purification efficiency is high, which can quickly reduce the concentration of fluoride ions in wastewater to below 5 mg / L.

[0005] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0006] A device for deep defluoridation of wastewater includes a purification tank. Inside the purification tank is a first dosing device for adding a defluoridating precipitant, which purifies the wastewater through sedimentation. The purification tank also includes an adsorption purification device located near the top of the tank, rotating around the tank's axis. The adsorption purification device includes a flow guiding device with a first flow guiding end and a second flow guiding end. A storage device for storing adsorbent material is installed outside the second flow guiding end. The storage device is connected to a drain pipe away from the second flow guiding end. Continuous rotation of the flow guiding device enables continuous adsorption and purification of the supernatant in the purification tank.

[0007] Preferably, the cross-sectional dimension of the first guide end is larger than the cross-sectional dimension of the second guide end.

[0008] Preferably, the drain pipe is equipped with a first filter screen, and the second guide end is equipped with a second filter screen.

[0009] Preferably, the upper end of the flow guiding device is equipped with a second dispensing device for dispensing adsorbent material toward the storage device, and the lower end of the flow guiding device is equipped with a control component for discharging adsorbent material.

[0010] Preferably, the control component includes a control baffle rotatably connected to the inner wall of the storage device, and the inner wall of the storage device is also provided with a retractable sealing block. The sealing block has a U-shaped cross-section, wherein the sealing block extends out of the control baffle to form a bottom sealing structure after the control baffle is rotated to a horizontal position.

[0011] Preferably, the bottom of the second dispensing device is connected to the storage device, and a sealing valve assembly is provided inside the second dispensing device.

[0012] Preferably, the sealing valve assembly includes a first sealing valve assembly and a second sealing valve assembly, and the first sealing valve assembly and the second sealing valve assembly have a predetermined distance between them.

[0013] Preferably, a feeding device for dispensing adsorbent material is also provided above the purification pool. The feeding device has a feeding pipe, and the top of the second feeding device has a feeding opening. The feeding pipe is located on the rotation path of the second feeding device.

[0014] Preferably, a central pipe is also provided at the axis of the purification tank, and the drain pipe is connected to the central pipe through a negative pressure pipe.

[0015] A method for deep defluoridation of wastewater includes the following steps: S1, controlling the first dosing device to add defluoridating precipitant into the purification tank, and controlling the precipitate to settle at the bottom of the purification tank to achieve sedimentation purification; S2, controlling the adsorption purification device to continuously rotate around the axis of the purification tank, and the supernatant in the purification tank to continuously pass through the storage device to achieve adsorption purification.

[0016] The beneficial effects of this invention are as follows:

[0017] With the above structural design, a single purification tank is sufficient to complete the sedimentation and adsorption purification of wastewater. The adsorption material is cleverly placed at the top of the purification tank. During the directional rotation of the adsorption purification device, it can continuously adsorb and purify the supernatant, further reducing the fluoride ion concentration. The equipment occupies a small volume, the purification process is simple to operate, and the wastewater purification efficiency is high, which can quickly reduce the fluoride ion concentration in wastewater to below 5 mg / L. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 For the present invention Figure 1 A schematic diagram of the main structure.

[0020] Figure 3 For the present invention Figure 1 A top-view structural diagram.

[0021] Figure 4 This is a three-dimensional structural diagram of the adsorption purification device of the present invention.

[0022] Figure 5 For the present invention Figure 4 A schematic diagram of the main structure.

[0023] Figure 6 For the present invention Figure 5 A schematic diagram of the AA-direction cross-section structure.

[0024] Figure 7 For the present invention Figure 6 A magnified structural diagram at point B.

[0025] In the diagram: 100, purification tank; 200, central pipe; 300, adsorption purification device; 310, storage device; 311, control baffle; 312, sealing block; 313, drain pipe; 314, first filter screen; 320, flow guiding device; 321, second filter screen; 330, second dispensing device; 331, sealing valve group one; 332, sealing valve group two; 400, first dispensing device; 410, discharge pipe; 500, bottom rake; 600, feeding device; 610, feeding pipe. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Chemical precipitation and adsorption methods can be used to treat fluoride ions in wastewater in a deep manner, thereby reducing the concentration of fluoride ions in the wastewater and meeting the requirements for normal discharge.

[0028] Some companies combine the two methods to achieve deep purification of wastewater, reducing the fluoride ion concentration in wastewater from 20 mg / L to below 5 mg / L. The mechanisms for removing fluoride ions by chemical precipitation and adsorption are different, requiring the introduction of treatment media at different stages of wastewater treatment.

[0029] Typically, a composite agent such as lime and aluminum salt is first added to chemically settle the wastewater, and then adsorption materials are added to the settled wastewater for adsorption treatment. The traditional treatment process is carried out in different purification rooms, which requires a large space. In addition, the precipitates generated in the first stage need to be deeply removed to avoid affecting the adsorption materials. The above operations need to be carried out in different locations, making the operation process complicated and affecting the purification efficiency of fluoride ions in the wastewater.

[0030] To solve the above problems, please refer to the appendix.Figure 1 - Appendix Figure 7 A wastewater deep defluorination device includes a purification tank 100, and a first dosing device 400 for adding a defluorination precipitant is provided inside the purification tank 100. The first dosing device 400 is used to precipitate and purify the wastewater. The defluorination precipitant can be a composite agent such as lime or aluminum salt. When the above composite agent is added to the wastewater, it can form an insoluble substance with the fluoride ions in the wastewater, thereby removing the fluoride ions from the wastewater by forming a precipitate.

[0031] An adsorption purification device 300 is also installed inside the purification tank 100. The adsorption purification device 300 is located near the top of the purification tank 100. The adsorption purification device 300 rotates around the axis of the purification tank 100. During the continuous rotation of the adsorption purification device 300, it can adsorb and purify the supernatant in the purification tank 100. The fluoride in the wastewater is removed again through adsorption purification, and the deep removal of fluoride ions is achieved, which can reduce the concentration of fluoride ions in the supernatant to below 5 mg / L.

[0032] Specifically, the adsorption purification device 300 includes a flow guiding device 320, which has a first flow guiding end and a second flow guiding end. A storage device 310 for storing adsorbent material is installed on the outside of the second flow guiding end. The adsorbent material can be activated carbon. A drain pipe 313 is connected to the storage device 310 away from the second flow guiding end. By controlling the continuous rotation of the flow guiding device 320, the supernatant in the purification tank 100 is continuously adsorbed and purified. During the directional rotation of the adsorption purification device 300, the supernatant in the purification tank 100 can enter from the flow guiding device 320, pass through the storage device 310, and be discharged from the drain pipe 313. The supernatant passes through the adsorbent material in the storage device 310, thereby achieving deep removal of residual fluoride substances in the supernatant.

[0033] It should be noted that the sedimentation medium introduced by the first dispensing device 400 mixes with the wastewater and settles in a separate area. The settled sediment is located at the bottom of the purification tank 100. The sediment at the bottom of the purification tank 100 is cleaned regularly to ensure the efficiency of wastewater treatment in the purification tank 100. At the same time, the wastewater and sediment continuously flowing into the bottom of the purification tank 100 will push the supernatant to flow out continuously from the top. During the continuous rotation of the adsorption purification device 300, the supernatant at different stages can be contacted to achieve deep adsorption filtration, thereby achieving continuous purification treatment of the wastewater supernatant.

[0034] In summary, through the above structural design, a single purification tank 100 is sufficient to complete the sedimentation and adsorption purification of wastewater. The adsorption material is cleverly placed at the top of the purification tank 100, and the adsorption purification device 300 can continuously adsorb and purify the supernatant during directional rotation, further reducing the fluoride ion concentration. The equipment occupies a small volume, the purification process is simple to operate, and the wastewater purification efficiency is high, which can quickly reduce the fluoride ion concentration in wastewater to below 5 mg / L.

[0035] Preferably, the cross-sectional size of the first guide end is larger than that of the second guide end. The guide device 320 can be selected as shown in the attached figure, with a trapezoidal horizontal cross-section. During the continuous rotation of the adsorption and purification device 300, the supernatant continuously flows from the end with the larger cross-sectional opening to the side with the smaller cross-sectional opening and enters the storage device 310, thereby achieving continuous purification of the supernatant. Through the above design, the supernatant at different locations in the purification tank 100 can be deeply cleaned. At the same time, the supernatant can pass through the storage device 310 at a high flow rate, and the supernatant can fully contact the adsorption material to achieve deep removal of fluoride ions in the supernatant.

[0036] It should be noted that in order to achieve deep removal of the supernatant at different locations within the purification tank 100, the cross-sectional length of the first guide end of the guide device 320 should be consistent with the radius of the purification tank 100.

[0037] A first filter screen 314 is installed in the drain pipe 313, and a second filter screen 321 is installed in the second guide end. The adsorbent material is placed between the first filter screen 314 and the second filter screen 321. The supernatant passes through the second filter screen 321 in sequence, and the adsorbent material finally passes through the first filter screen 314 and is discharged from the drain pipe 313, achieving deep purification of the supernatant. The above arrangement can limit the adsorbent material, keeping it in a constant position to contact the flowing supernatant. Compared with the traditional method of directly adding adsorbent material, the adsorption state of the adsorbent material is easier to determine, and it is also easier to process the adsorbent material, thus improving the efficiency of wastewater purification.

[0038] A second dispensing device 330 is installed at the upper end of the flow guiding device 320 to dispense adsorbent material into the storage device 310. A control component for discharging adsorbent material is installed at the lower end of the flow guiding device 320. When the adsorbent material in the storage device 310 reaches the upper limit of adsorption, the bottom control component is opened first to discharge the adsorbent material inside the storage device 310. After the adsorbent material in the storage device 310 is completely discharged, the control component is closed, and new adsorbent material is dispensed into the storage device 310 through the second dispensing device 330. The new adsorbent material can be used to further purify the supernatant, meeting the requirements of continuous automatic purification.

[0039] With the above arrangement, there is no need to replace the entire storage device 310; only the adsorbent needs to be replaced automatically periodically, which greatly simplifies the operation process and improves the treatment efficiency. At the same time, the adsorbent discharged from the bottom settles downwards under the action of gravity and can be discharged along with the sediment at the bottom, reducing the treatment efficiency. Meanwhile, the discharged adsorbent can come into contact with the high-concentration fluoride-containing wastewater during the settling process, realizing the purification treatment of the fluoride-containing wastewater, making full use of resources, satisfying the purification concept of maximizing utilization, reducing material input costs, and enhancing the purification effect of fluoride-containing wastewater.

[0040] Specifically, the control component includes a control baffle 311 rotatably connected to the inner wall of the storage device 310. The inner wall of the storage device 310 is also provided with a retractable sealing block 312. The sealing block 312 has a U-shaped cross-section. When the control baffle 311 is rotated to a horizontal position, the sealing block 312 extends outward to form a bottom sealing structure. When the control baffle 311 is rotated to an outer position, a discharge opening for the adsorbent material to pass through can be formed at the bottom of the storage device 310. Under the action of water flow and vibration, the adsorbent material can be quickly dispersed and discharged. After the adsorbent material is discharged, the control baffle 311 is rotated to a horizontal position, and the sealing block 312 extends outward to form a bottom sealing structure, thereby supporting the adsorbent material.

[0041] It should be noted that after the sealing block 312 extends, it can block the end of the control baffle 311, forming a U-shaped sealing gap, which enhances the sealing effect of the bottom structure, so as to prevent the supernatant from flowing out from the bottom and causing repeated adsorption and purification, thus avoiding affecting the adsorption and purification efficiency.

[0042] Meanwhile, the control baffle 311 here is located on the side away from the flow guiding device 320, and the discharge opening can extend towards the flow guiding device 320. The water flow entering from the flow guiding device 320 forms turbulence after hitting the inner wall of the storage device 310. The bending flow quickly discharges the adsorbent material in the storage device 310, accelerating the efficiency of adsorbent material discharge.

[0043] Furthermore, the bottom of the second dispensing device 330 is connected to the storage device 310. The second dispensing device 330 is equipped with a sealing valve group. By setting the sealing valve group, the top of the storage device 310 can be sealed to prevent excessive water pressure from being discharged from the second dispensing device 330, allowing the supernatant to continuously pass through the adsorption material to achieve deep adsorption and purification.

[0044] The preferred sealing valve assembly includes a first sealing valve assembly 331 and a second sealing valve assembly 332, with a predetermined distance between them. By cooperating with the first sealing valve assembly 331 and the second sealing valve assembly 332, the adsorbent material can be fed in stages. First, the first sealing valve assembly 331 is controlled to be in the closed state and the second sealing valve assembly 332 is in the open state, and the adsorbent material falls to the top of the first sealing valve assembly 331. Then, the second sealing valve assembly 332 is controlled to be in the closed state and the first sealing valve assembly 331 is in the open state, and the adsorbent material finally falls into the storage device 310. After the storage device 310 is filled, the first sealing valve assembly 331 is closed, and the adsorbent material achieves efficient purification of the supernatant within the predetermined space.

[0045] The sealing valve assembly 331 here can be a discharge valve core with a strip-shaped through opening in the middle, and the sealing valve assembly 332 here can be a sliding sealing plate. The two can be combined according to actual requirements to ensure rapid discharge of adsorbent material while achieving good double sealing.

[0046] A vibration device can also be designed between the storage device 310 and the second dispensing device 330 to accelerate the feeding of the adsorbent material during the feeding process.

[0047] Above the purification tank 100, a feeding device 600 for dispensing adsorbent material is also provided. The feeding device 600 has a feeding pipe 610, and the top of the second dispensing device 330 has a dispensing opening. The feeding pipe 610 is located on the rotation path of the second dispensing device 330. When the adsorption purification device 300 rotates to below the feeding pipe 610, adsorbent material is dispensed towards the top of the second dispensing device 330, realizing automatic replenishment of adsorbent material. During the replenishment process, the adsorption purification device 300 is kept in a stationary state, and the dispensing of wastewater into the first dispensing device 400 is also stopped to prevent the supernatant from rising continuously without purification, effectively reducing the concentration of fluoride ions in the supernatant.

[0048] A central pipe 200 is also installed at the axis of the purification tank 100. The drain pipe 313 is connected to the central pipe 200 through a negative pressure pipe. The negative pressure pipe can continuously discharge the supernatant purified by adsorption at the drain pipe 313, which can prevent the supernatant from overflowing from the top. With the above arrangement, the rate of negative pressure adsorption of supernatant can be adjusted in real time according to the rotation speed of the adsorption purification device 300, which can meet the purification requirements under different conditions. At the same time, the purified supernatant is discharged in time and will not mix with the unpurified supernatant in the purification tank 100 again, avoiding repeated filtration and further improving the efficiency of wastewater supernatant adsorption and defluorination purification.

[0049] A method for deep defluoridation of wastewater includes the following steps:

[0050] S1. Control the first dispensing device 400 to dispense defluorination precipitant into the purification tank 100, and control the precipitate to settle at the bottom of the purification tank 100 to achieve sedimentation purification; the first dispensing device 400 includes a sedimentation sleeve located in the middle of the purification tank 100, wastewater and defluorination precipitant are mixed in the sedimentation sleeve, and the generated precipitate falls to the bottom of the purification tank 100 for sedimentation; the precipitate at the bottom of the purification tank 100 is treated periodically to achieve the discharge of the precipitate, and at the same time, the upper part between the purification tank 100 and the first dispensing device 400 is the supernatant, which overflows from the top of the purification tank 100.

[0051] S2. Control the adsorption purification device 300 to rotate continuously around the axis of the purification tank 100. The supernatant in the purification tank 100 continuously passes through the storage device 310 to achieve adsorption purification. The adsorption material in the adsorption purification device 300 can re-adsorb and purify the fluoride-containing wastewater in the supernatant, further reducing the fluoride ion concentration in the supernatant to below 5 mg / L, which meets the requirements for wastewater discharge.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for deep defluoridation of wastewater, comprising a purification tank (100), wherein the purification tank (100) is provided with a first dosing device (400) for dosing a defluoridation precipitant, and the wastewater is purified by sedimentation through the first dosing device (400), characterized in that: The purification pool (100) is also equipped with an adsorption purification device (300), which is located in the purification pool (100) near the top and rotates around the axis of the purification pool (100). The adsorption purification device (300) includes a flow guiding device (320), which has a first flow guiding end and a second flow guiding end. A storage device (310) for storing adsorbent material is installed on the outside of the second flow guiding end. The storage device (310) is connected to a drain pipe (313) away from the second flow guiding end. The flow guiding device (320) is controlled to rotate continuously to achieve continuous adsorption and purification of the supernatant of the purification tank (100).

2. The wastewater deep defluorination equipment according to claim 1, characterized in that, The cross-sectional dimension of the first guide end is larger than that of the second guide end.

3. The wastewater deep defluorination equipment according to claim 1, characterized in that, The drain pipe (313) is equipped with a first filter screen (314), and the second guide end is equipped with a second filter screen (321).

4. The wastewater deep defluorination equipment according to claim 1, characterized in that, The upper end of the flow guiding device (320) is equipped with a second dispensing device (330) for dispensing adsorbent material toward the storage device (310), and the lower end of the flow guiding device (320) is equipped with a control component for discharging adsorbent material.

5. The wastewater deep defluorination equipment according to claim 4, characterized in that, The control component includes a control baffle (311) rotatably connected to the inner wall of the storage device (310). The inner wall of the storage device (310) is also provided with a retractable sealing block (312). The sealing block (312) has a U-shaped cross section. When the control baffle (311) is rotated to a horizontal position, the sealing block (312) extends out, and the control baffle (311) and the sealing block (312) form a bottom sealing structure.

6. The wastewater deep defluorination equipment according to claim 4, characterized in that, The bottom of the second dispensing device (330) is connected to the storage device (310), and a sealing valve assembly is provided inside the second dispensing device (330).

7. The wastewater deep defluorination equipment according to claim 6, characterized in that, The sealing valve assembly includes a first sealing valve assembly (331) and a second sealing valve assembly (332), and there is a predetermined distance between the first sealing valve assembly (331) and the second sealing valve assembly (332).

8. The wastewater deep defluorination equipment according to claim 4, characterized in that, Above the purification tank (100) is a feeding device (600) for dispensing adsorbent material. The feeding device (600) has a feeding pipe (610). The second dispensing device (330) has a dispensing opening at the top. The feeding pipe (610) is located on the rotation path of the second dispensing device (330).

9. The wastewater deep defluorination equipment according to claim 1, characterized in that, A central pipe (200) is also provided at the axis of the purification tank (100), and the drain pipe (313) is connected to the central pipe (200) through a negative pressure pipe.

10. A method for deep defluoridation of wastewater, characterized in that, The wastewater deep defluorination equipment according to any one of claims 1-9 comprises the following steps: S1. Control the first dispensing device (400) to dispense defluorination precipitant into the purification tank (100), and control the precipitate to settle at the bottom of the purification tank (100) to achieve sedimentation purification; S2. Control the adsorption and purification device (300) to rotate continuously around the axis of the purification tank (100), and the supernatant in the purification tank (100) continuously passes through the storage device (310) to achieve adsorption and purification.

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