CN216662690U - Water treatment system for removing fluoride ions with different concentrations in water - Google Patents
Water treatment system for removing fluoride ions with different concentrations in water Download PDFInfo
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- CN216662690U CN216662690U CN202123203922.7U CN202123203922U CN216662690U CN 216662690 U CN216662690 U CN 216662690U CN 202123203922 U CN202123203922 U CN 202123203922U CN 216662690 U CN216662690 U CN 216662690U
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Abstract
The utility model discloses a water treatment system for removing fluoride ions with different concentrations in water, wherein a water outlet at the top of a chemical crystallization circulating granulation fluidized bed is communicated with a water inlet at the bottom of the high-efficiency solid-liquid separation circulating granulation fluidized bed through a middle water outlet pipe; the middle part of the chemical crystallization circulating granulation fluidized bed is also communicated with a sodium hydroxide dosing tank and/or a sodium dihydrogen phosphate dosing tank, and/or the bottom of the chemical crystallization circulating granulation fluidized bed is also communicated with a calcium chloride dosing tank; the water inlet at the bottom of the circulating granulation fluidized bed for high-efficiency solid-liquid separation is also communicated with a PAC dosing tank and/or a PAM dosing tank. The system of the utility model greatly simplifies the processing flow and greatly improves the application occasions.
Description
Technical Field
The utility model belongs to the field of water treatment, relates to a circulating granulation fluidized bed, and particularly relates to a water treatment system for removing fluorine ions with different concentrations in water.
Background
Water is the source of life and is closely related to our lives. Fluorine ions widely exist in the nature, and normal intake of fluorine ions is beneficial to human bodies, but too much fluorine ions and too little fluorine ions can cause great harm to the human bodies. At present, due to the action of natural environment and the emission of human factors, the excessive content of fluorine in natural water becomes an urgent problem to be solved in many areas of China. In addition, due to the development of industries such as semiconductors in China, the discharge amount of high-concentration fluorine-containing wastewater is large, and the problem of finding a suitable mode for treating high-concentration fluorine-containing water is not negligible. Aiming at the problems, because the content of fluorine ions to be treated is greatly different, most of domestic current solutions are respectively treated, namely two sets of systems are respectively used for treating high-fluorine wastewater and fluorine-containing source water, and the two systems are respectively treated and cannot be applied to different environments through one set of equipment, so that the product use environment is less, and the treatment process is relatively complex.
In the prior art, a chemical precipitation method is mostly adopted, namely, a precipitator is added into fluorine-containing water, so that fluorine ions are converted into fluoride precipitates, and then the precipitates are separated from raw water, so that the aim of removing the fluorine ions is fulfilled. The method is simple to operate and maintain and low in cost, so that the method becomes one of common methods for removing the fluorine ions in the water. However, the chemical precipitation method has poor fluorine treatment effect, generally needs to be followed by advanced treatment, often generates a large amount of fluoride precipitates, is difficult to recycle and is easy to cause secondary pollution.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide a water treatment system for removing fluoride ions with different concentrations in water, and solve the technical problem that the chemical precipitation method in the prior art has poor fluorine treatment effect.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a water treatment system for removing fluoride ions with different concentrations in water comprises a chemical crystallization circulating granulation fluidized bed and a high-efficiency solid-liquid separation circulating granulation fluidized bed, wherein a water outlet at the top of the chemical crystallization circulating granulation fluidized bed is connected with a first water outlet pipe;
the system also comprises a fluorine-containing raw water tank which is communicated with a water inlet at the bottom of the chemical crystallization circulating granulation fluidized bed through a water inlet pipe with a centrifugal pump;
the middle part of the chemical crystallization circulating granulation fluidized bed is also communicated with a sodium hydroxide dosing tank and/or a sodium dihydrogen phosphate dosing tank, and/or the bottom of the chemical crystallization circulating granulation fluidized bed is also communicated with a calcium chloride dosing tank;
the water inlet at the bottom of the circulating granulation fluidized bed for high-efficiency solid-liquid separation is also communicated with a PAC dosing tank and/or a PAM dosing tank.
The utility model also has the following technical characteristics:
and the sodium hydroxide dosing tank, the sodium dihydrogen phosphate dosing tank, the calcium chloride dosing tank, the PAC dosing tank and the PAM dosing tank are respectively provided with a dosing diaphragm pump.
The water inlet pipe at the upstream of the centrifugal pump is provided with an inlet water fluorine ion concentration on-line detector and an on-line flowmeter.
And the middle water outlet pipe is also provided with an outlet water fluorine ion concentration online detector and an online turbidity meter.
Compared with the prior art, the utility model has the following technical effects:
the system can be used for treating the fluorine-containing water with different concentrations, solves the problem that the high-concentration fluorine-containing wastewater and the fluorine-containing source water need to be treated respectively, greatly simplifies the treatment process, greatly improves the application occasions, has better capability of coping with the water quality change due to the capability of treating the fluorine-containing water with different concentrations, and improves the treatment effect.
And (II) the system is provided with the chemical crystallization circulating granulation fluidized bed which is a main process for removing fluorine, and the fluidized bed is provided with the inner cylinder and has internal circulation, so that the load of water inflow and the water treatment amount can be greatly improved, and the treatment effect is greatly improved compared with that of the traditional fluidized bed. The fluidized bed used in the system is simple to manufacture and install, and compared with the fluidized bed provided with the clarification zone and the external circulation, the convenience of installation and operation is improved, and time and labor are saved.
The system of the utility model has high integration degree, does not need to design a sedimentation tank and other related structures compared with the traditional defluorination mode, has small occupied area and clean and tidy operation conditions, and does not generate fluoride precipitation by-products and the possibility of generating secondary pollution due to the existence of a crystallization granulation technology and a circulating granulation fluidized bed for high-efficiency solid-liquid separation.
(IV) the system of the utility model can provide a foundation for the subsequent automatic removal of fluoride ions in water, is convenient to realize automation, can control the start and stop of the water pump and the medicine pump by adding an automatic control system subsequently, realizes the real-time monitoring of the inflow and the outflow turbidity, is simple to operate, even can be unattended, greatly reduces the consumption of manpower and material resources, and ensures that the operation flow of the whole system is simpler.
Drawings
FIG. 1 is a schematic diagram of the overall configuration of a water treatment system for removing fluoride ions from water at different concentrations.
The meaning of the individual reference symbols in the figures is: 1-a chemical crystallization circulating granulation fluidized bed, 2-a high-efficiency solid-liquid separation circulating granulation fluidized bed, 3-a first water outlet pipe, 4-a middle water outlet pipe, 5-a second water outlet pipe, 6-a fluorine-containing raw water tank, 7-a centrifugal pump, 8-a water inlet pipe, 9-a sodium hydroxide dosing tank, 10-a sodium dihydrogen phosphate dosing tank, 11-a calcium chloride dosing tank, 12-a PAC dosing tank, 13-a PAM dosing tank, 14-a dosing diaphragm pump, 15-an inlet water fluorine ion concentration online detector, 16-an online flowmeter, 17-an outlet water fluorine ion concentration online detector and 18-an online turbidity meter.
The present invention will be explained in further detail with reference to examples.
Detailed Description
It is to be understood that all parts, devices and apparatus of the present invention, unless otherwise specified, are intended to be covered by the present invention as if fully set forth herein.
The following embodiments are given as examples of the present invention, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are included in the protection scope of the present invention.
Example (b):
the embodiment provides a water treatment system for removing fluoride ions with different concentrations in water, which comprises a chemical crystallization circulating granulation fluidized bed 1 and a high-efficiency solid-liquid separation circulating granulation fluidized bed 2 as shown in fig. 1, wherein a first water outlet pipe 3 is connected to a water outlet at the top of the chemical crystallization circulating granulation fluidized bed 1, the water outlet at the top of the chemical crystallization circulating granulation fluidized bed 1 is also communicated with a water inlet at the bottom of the high-efficiency solid-liquid separation circulating granulation fluidized bed 2 through an intermediate water outlet pipe 4, and a second water outlet pipe 5 is connected to a water outlet at the top of the high-efficiency solid-liquid separation circulating granulation fluidized bed 2;
the device also comprises a fluorine-containing raw water tank 6, wherein the fluorine-containing raw water tank 6 is communicated with a water inlet at the bottom of the chemical crystallization circulating granulation fluidized bed 1 through a water inlet pipe 8 with a centrifugal pump 7;
the middle part of the chemical crystallization circulating granulation fluidized bed 1 is also communicated with a sodium hydroxide dosing tank 9 and/or a sodium dihydrogen phosphate dosing tank 10, and/or the bottom of the chemical crystallization circulating granulation fluidized bed 2 is also communicated with a calcium chloride dosing tank 11;
the water inlet at the bottom of the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation is also communicated with a PAC (polyaluminium chloride) dosing tank 12 and/or a PAM (polyacrylamide) dosing tank 13.
In this embodiment, the water outlet pipes are a first water outlet pipe 3 and a second water outlet pipe 5, and when the effluent of the chemical crystallization circulating granulation fluidized bed 1 reaches the standard, the effluent directly enters the next structure through the first water outlet pipe 3 without entering the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation.
Further, a sodium hydroxide dosing tank 9, a sodium dihydrogen phosphate dosing tank 10, a calcium chloride dosing tank 11, a PAC dosing tank 12 and a PAM dosing tank 13 are respectively provided with a dosing diaphragm pump 14. The top of the dosing tank is sealed by a cover, and the lower part of the dosing tank is provided with a water outlet which is connected with a dosing diaphragm pump 14. A Y-shaped filter is arranged on the dosing pipeline behind the dosing diaphragm pump 14.
Further, an inlet pipe 8 at the upstream of the centrifugal pump 7 is provided with an inlet water fluorine ion concentration online detector 15 and an online flowmeter 16. The intermediate water outlet pipe 4 is also provided with an outlet water fluorine ion concentration online detector 17 and an online turbidity meter 18. In this embodiment, whether the circulating granulation fluidized bed 2 for subsequent high-efficiency solid-liquid separation is required or not is determined according to the monitoring result of the on-line turbidity meter 18.
The inlet water fluorine ion concentration on-line detector 15, the on-line flowmeter 16, the outlet water fluorine ion concentration on-line detector 17 and the on-line turbidity meter 18 can be connected with an automatic control cabinet in the subsequent process, and the automatic control cabinet controls each dosing diaphragm pump 14 to dose chemicals so as to realize automatic control. The automatic control cabinet should have a certain distance from the system and be provided with waterproof measures. The automatic control cabinet can also monitor two parameter changes in real time by virtue of a flowmeter and a turbidity meter and display the parameter changes on the automatic control cabinet, and a sampling port is required to be reserved on a system for sampling and measuring parameters such as the concentration of fluorine ions.
In this embodiment, the material can be adjusted according to the inflow flow size to inlet tube 8, can use PVC tubular product in the little scene of required inflow flow, can use cast iron tubular product in the big scene of required inflow flow. The connection mode between the pipe sections is loose joint when the water inlet pipe 8 uses PVC pipes, and flange connection when the cast iron pipes are used. A sampling port is reserved on the water inlet pipe 8.
In this example, the chemical crystallization circulating granulation fluidized bed 1 is a known chemical crystallization circulating granulation fluidized bed. Further, the chemical crystallization circulating granulation fluidized bed 1 comprises a base, a medicine feeding unit is connected to the base, a bed body is installed on the medicine feeding unit, an inner cylinder is arranged in the bed body, sampling ports are uniformly distributed on the bed body and can be used for adding medicine, and a water outlet pipeline are arranged at the top of the bed body for discharging water.
The connection mode between base, the unit of advancing medicine and the bed body is flange joint, and wherein base and the unit of advancing medicine all need be the carbon steel material, and the bed body can be according to the on-the-spot flow requirement and select between carbon steel material and organic glass, if the bed body is the carbon steel material, then need set up the window on the bed body.
The medicine feeding unit is an annular object made of carbon steel, the periphery of the medicine feeding unit is provided with a medicine feeding head which is directly connected with the chemical crystallization circulating granulation fluidized bed, and the top of the medicine feeding head is provided with a small hole for feeding medicine to prevent seed crystal from flowing backwards.
In this example, the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation is a known circulating granulation fluidized bed for high-efficiency solid-liquid separation. Further, the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation comprises a base frame, a tank body is fixedly mounted on the base frame, an inner cylinder is mounted inside the tank body, and a stirring device is arranged in the inner cylinder and connected with a motor outside the inner cylinder to provide power for the stirring device. The tank body and the inner cylinder are connected through a ribbed plate.
When the water treatment system for removing the fluoride ions with different concentrations in the water is used, the whole system is started and starts to operate. The inflow rate is detected by an online flowmeter 16 and is controlled by the centrifugal pump 7 according to requirements. After water flow enters the chemical crystallization circulating granulation fluidized bed 1 through the water inlet pipe 8, the dosing is controlled through the dosing diaphragm pump 14.
When high-concentration fluorine-containing wastewater is treated, only the dosing diaphragm pump 14 corresponding to the calcium chloride dosing tank 11 needs to be opened, the effluent of the chemical crystallization circulating granulation fluidized bed 1 enters the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation through the middle water outlet pipe 4 for advanced treatment, and the dosing diaphragm pump 14 corresponding to the PAC dosing tank 12 and the PAM dosing tank 13 is opened at the same time. If the low-concentration fluorine-containing wastewater is treated, the dosing diaphragm pumps 14 corresponding to the sodium dihydrogen phosphate dosing tank 10 and the calcium chloride dosing tank 11 need to be opened simultaneously, and the effluent of the chemical crystallization circulating granulation fluidized bed 1 can be directly discharged through the first water outlet pipe 3 without entering the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation for treatment.
After water flow enters the chemical crystallization circulating granulation fluidized bed 1 through the water inlet pipe 8, the water enters the dosing unit through the water distribution unit in the base, and further flows upwards to pass through the whole chemical crystallization circulating granulation fluidized bed 1, and finally flows out from a water outlet at the top of the chemical crystallization circulating granulation fluidized bed 1. The chemical crystallization circulating granulation fluidized bed 1 is internally filled with seed crystals, raw water entering the chemical crystallization circulating granulation fluidized bed 1 and medicament entering the fluidized bed are subjected to reaction along the way under the induction of the seed crystals, the seed crystals are in a fluidized state in the chemical crystallization circulating granulation fluidized bed due to the reason of upward flowing water, the contact area of fluoride ions, the medicament and the seed crystals in water is further increased, the reaction is easier to carry out, and the reaction effect is better. Because the inner cylinder is arranged in the chemical crystallization circulating granulation fluidized bed 1, the top of the inner cylinder is lower than that of the fluidized bed, the hydraulic condition is better, water flow and seed crystals can circularly flow in the fluidized bed, the ascending load of the chemical crystallization circulating granulation fluidized bed 1 is greatly improved, the treated water quantity is larger, the reaction time of inlet water is longer due to the circular flow in the fluidized bed under the induction of the seed crystals, and the removal rate of fluorine ions is effectively improved.
After water flows out of the chemical crystallization circulating granulation fluidized bed 1 through the middle water outlet pipe 4, the real-time monitoring of the effluent turbidity is realized through the prior turbidity meter 18 arranged on the middle water outlet pipe 4, and whether the effluent needs to be treated by the circulating granulation fluidized bed 2 with high-efficiency solid-liquid separation is also controlled according to the effluent turbidity.
The cooperation of the inlet water fluorine ion concentration on-line detector 15 and the outlet water fluorine ion concentration on-line detector 17 can monitor whether the outlet water fluorine ion concentration reaches the standard, and can also be used as one of the factors for the chemical crystallization circulating granulation fluidized bed 1 whether the outlet water needs to enter the circulating granulation fluidized bed 2 for high-efficiency solid-liquid separation for advanced treatment.
The water flow passes through the chemical crystallization circulating granulation fluidized bed 1 and the high-efficiency solid-liquid separation circulating granulation fluidized bed 2, so that the concentration of the fluorine ions in the effluent can reach the standard requirement, or the concentration of the fluorine ions in the effluent can be adjusted by changing the rotating speed of the dosing diaphragm pump 14 and the rising flow rate of the water flow according to the field requirement. The system can treat fluorine-containing water with different concentrations, and can adjust the dosage and the type through the diaphragm pump to achieve the purposes of reducing turbidity and softening.
Application example:
the present application example shows an operation example of the water treatment system for removing fluorine ions with different concentrations in water in the above embodiment. The plant was started in west ampere and the present example was only explored for the treatment of source water containing fluorine, since the high fluorine water test had been performed during the previous run and the removal of fluoride ions from high fluorine wastewater using a fluidized bed system was well established.
In the application example, when the system starts to operate, the concentration of the fluorine ions in the inlet water is 2mg/L, the pH value of the inlet water is 7.6, and the turbidity of the inlet water is 0.7 NTU. The chemical crystallization circulating granulation fluidized bed is of pilot scale, the height of the bed body is 3.7m, the diameter of the bed body is 0.2m, and 60cm of seed crystal is filled in the bed body. And starting a calcium chloride dosing pump and a sodium dihydrogen phosphate dosing pump, and enabling the effluent to be stable after the chemical crystallization circulating granulation fluidized bed starts to operate for 8 hours. After the effluent water is stable, according to F: p: the Ca molar ratio is 1: 20: 50, adding chemicals, wherein the upward flow velocity in the pilot scale chemical crystallization circulating granulation fluidized bed is 15m/h in the process, and the pH of inlet water can be reduced to be below 7 due to the addition of sodium dihydrogen phosphate.
After the operation is carried out for half an hour, the effluent index of the chemical crystallization circulating granulation fluidized bed is measured, and compared with the water inlet index, the fluorine ion of the effluent is reduced to 0.905mg/L, so that the effluent requirement is met; the calcium ion concentration of the effluent is 370mg/L (as CaCO)3Metering), the concentration of phosphorus ions in the effluent is 30mg/L, the turbidity of the effluent is increased to 2NTU, a PAC dosing pump and a PAM dosing pump are started according to the turbidity data fed back by a turbidity meter, and because the concentrations of calcium and phosphorus ions in the effluent are higher, a NaOH dosing pump is manually started, the effluent of a chemical crystallization circulating granulation fluidized bed enters a circulating granulation fluidized bed with high-efficiency solid-liquid separation for advanced treatment, calcium carbonate and calcium hydroxy phosphate are induced to be generated and precipitated to remove calcium and phosphorus, and the turbidity of the effluent is reduced. The effluent water treated by the circulating granulation fluidized bed with high-efficiency solid-liquid separation has the concentration of fluorine ions, calcium ions, phosphorus ions and turbidityAll meet the requirements.
Besides the example, in other operation processes, the system disclosed by the utility model has a good treatment effect on high-fluorine source water and high-fluorine wastewater with the concentration of below 10 mg/L.
Claims (4)
1. A water treatment system for removing fluoride ions with different concentrations in water comprises a chemical crystallization circulating granulation fluidized bed (1) and a high-efficiency solid-liquid separation circulating granulation fluidized bed (2), and is characterized in that a first water outlet pipe (3) is connected to a water outlet at the top of the chemical crystallization circulating granulation fluidized bed (1), the water outlet at the top of the chemical crystallization circulating granulation fluidized bed (1) is communicated with a water inlet at the bottom of the high-efficiency solid-liquid separation circulating granulation fluidized bed (2) through an intermediate water outlet pipe (4), and a water outlet at the top of the high-efficiency solid-liquid separation circulating granulation fluidized bed (2) is connected with a second water outlet pipe (5);
the device also comprises a fluorine-containing raw water tank (6), wherein the fluorine-containing raw water tank (6) is communicated with a water inlet at the bottom of the chemical crystallization circulating granulation fluidized bed (1) through a water inlet pipe (8) with a centrifugal pump (7);
the middle part of the chemical crystallization circulating granulation fluidized bed (1) is also communicated with a sodium hydroxide dosing tank (9) and/or a sodium dihydrogen phosphate dosing tank (10), and/or the bottom of the chemical crystallization circulating granulation fluidized bed (2) is also communicated with a calcium chloride dosing tank (11);
the water inlet at the bottom of the circulating granulation fluidized bed (2) for high-efficiency solid-liquid separation is also communicated with a PAC dosing tank (12) and/or a PAM dosing tank (13).
2. The water treatment system for removing fluoride ions with different concentrations in water according to claim 1, wherein the sodium hydroxide dosing tank (9), the sodium dihydrogen phosphate dosing tank (10), the calcium chloride dosing tank (11), the PAC dosing tank (12) and the PAM dosing tank (13) are respectively provided with a dosing diaphragm pump (14).
3. The water treatment system for removing the fluorine ions with different concentrations in the water as claimed in claim 1, wherein the inlet pipe (8) at the upstream of the centrifugal pump (7) is provided with an inlet water fluorine ion concentration online detector (15) and an online flowmeter (16).
4. The water treatment system for removing the fluoride ions with different concentrations in the water as claimed in claim 1, wherein the intermediate water outlet pipe (4) is further provided with an outlet water fluoride ion concentration online detector (17) and an online turbidity meter (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123203922.7U CN216662690U (en) | 2021-12-17 | 2021-12-17 | Water treatment system for removing fluoride ions with different concentrations in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123203922.7U CN216662690U (en) | 2021-12-17 | 2021-12-17 | Water treatment system for removing fluoride ions with different concentrations in water |
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| CN216662690U true CN216662690U (en) | 2022-06-03 |
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| CN202123203922.7U Active CN216662690U (en) | 2021-12-17 | 2021-12-17 | Water treatment system for removing fluoride ions with different concentrations in water |
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- 2021-12-17 CN CN202123203922.7U patent/CN216662690U/en active Active
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