CN114477516A - Fluoride wastewater treatment process - Google Patents
Fluoride wastewater treatment process Download PDFInfo
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- CN114477516A CN114477516A CN202111612025.3A CN202111612025A CN114477516A CN 114477516 A CN114477516 A CN 114477516A CN 202111612025 A CN202111612025 A CN 202111612025A CN 114477516 A CN114477516 A CN 114477516A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 15
- 239000011737 fluorine Substances 0.000 claims abstract description 42
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 42
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 41
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 21
- 239000000243 solution Substances 0.000 claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 238000004062 sedimentation Methods 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims abstract description 10
- 238000000975 co-precipitation Methods 0.000 claims abstract description 9
- 239000006228 supernatant Substances 0.000 claims abstract description 8
- 230000001376 precipitating effect Effects 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000005189 flocculation Methods 0.000 claims abstract description 6
- 230000016615 flocculation Effects 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 239000000706 filtrate Substances 0.000 claims abstract description 5
- 239000010802 sludge Substances 0.000 claims description 10
- 208000005156 Dehydration Diseases 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 238000012946 outsourcing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 description 3
- 229910001610 cryolite Inorganic materials 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002686 phosphate fertilizer Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/583—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing fluoride or fluorine compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a fluoride wastewater treatment process, S1, preparing a defluorinating agent into an aqueous solution with the concentration of 5-15%; s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 5-7; the adjusted defluorinating agent is put into a pool and reacts for 0.25 to 0.5 hour under continuous stirring; s3, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 8.5-9.5, carrying out alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation; s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding a polyacrylamide solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring; and S5, after uniformly mixing, discharging into a sedimentation tank, standing and precipitating for 1-3h, filtering the supernatant with too high SS, adjusting the fluorine content of the filtrate to reach the discharge standard, and adjusting the pH to 6-9 by a pH neutral adjusting tank to directly discharge. The invention has obvious effect of removing the fluoride ion wastewater through the synergistic action of capture, coprecipitation and net capture adsorption, realizes standard discharge, and does not need to add subsequent resin equipment for advanced treatment, thereby greatly saving the cost.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a fluoride wastewater treatment process.
Background
The main source of fluorine pollution in water environment is fluorine-containing 'three wastes' discharged from industrial production, and relates to the industries of aluminum electrolysis, steel, cement, brick and tile, ceramics, phosphate fertilizer, glass, semiconductors, pharmacy and the like. The common characteristic of these industries is that the fluorine-containing minerals are used as main or auxiliary raw materials, and during the smelting and production processes, fluorine is decomposed from the minerals and enters the environment, resulting in fluorine pollution. For example: aluminum fluoride AlF is required to be added in the production process of electrolytic aluminum industry3And cryolite Na3AlF6。
The fluorine pollution in the steel industry is mainly that fluorite added in the converter steelmaking process can cause a large amount of fluorine-containing smoke, dust, metallurgical slag and waste water in the smelting process; the fluorine pollution in the phosphate fertilizer industry is caused by the fact that phosphate ore contains fluorine, and when the phosphate ore is processed by an acid method, a part of the fluorine escapes as waste gas; in the production of glass, ceramics, cement and other industries, fluorite, cryolite, sodium fluosilicate and other fluorine-containing raw materials are often required to be added, and a large amount of fluorine pollution can be generated when the raw materials are fired at high temperature; hydrofluoric acid, ammonium fluoride and the like are needed in the etching process in the semiconductor industry, which is the source of fluorine-containing wastewater; because coal contains fluorine, coal-fired flue gas of thermal power plants and other industries including civil use also contains a certain amount of fluorine.
Disclosure of Invention
The invention aims to provide a fluoride wastewater treatment process which can effectively remove fluorine-containing ions and realize standard discharge of fluorine-containing wastewater.
The invention realizes the purpose through the following technical scheme: a fluoride wastewater treatment process comprises the following steps:
s1, preparing a fluorine removal agent into an aqueous solution with the concentration of 5% -15%;
s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 5-7; reacting the adjusted defluorinating agent in a pool for 0.25-0.5 h under continuous stirring to generate enough free radicals for reaction;
s3, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 8.5-9.5, carrying out an alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation;
s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding a polyacrylamide solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring;
and S5, after uniformly mixing, discharging into a sedimentation tank, standing and precipitating for 1-3h, filtering the supernatant with too high SS, adjusting the fluorine content of the filtrate to reach the discharge standard, and adjusting the pH to 6-9 by a pH neutral adjusting tank to directly discharge.
Further, the treatment process also comprises S6, pumping the sludge generated in the sedimentation tank into a filter press for dehydration treatment, returning the concentrated water to the front end of the process for treatment, and outsourcing treatment of the generated sludge cake.
Further, the mass ratio of the fluorine removing agent to the fluorine is 1.5: 1.
Further, the stirring reaction rate of the S2 was 120 r/min.
Further, the concentration of the sodium hydroxide solution is 5%.
Further, the concentration of the polyacrylamide solution is 0.1%, and the adding amount is 5-6 mL/L.
Further, the slow stirring speed of S4 is 60 r/min.
Compared with the prior art, the fluoride wastewater treatment process has the beneficial effects that: through combining together precipitation technique and seizure technique, through catching, coprecipitation, net catch absorption synergism, it is obvious to the removal effect of fluoride ion waste water to realize discharge to reach standard, need not to add subsequent resin equipment and carry out advanced treatment, thereby practiced thrift the cost greatly.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
A fluoride wastewater treatment process comprises the following embodiments:
example 1
The water quality of the fluorine-containing wastewater of a certain smelting plant: the suspended matter (SS) is 30-80 mg/L, the total fluorine is 210mg/L, the waste water flow is 50t/h, and the operation is carried out for 10h every day. The implementation steps of the method are as follows:
s1, preparing a fluorine removal agent into a 5% aqueous solution; the grade of the defluorinating agent is GMS-F2;
s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 5; reacting the adjusted defluorinating agent in a pool for 0.25h under the condition of continuously stirring at 120r/min to generate enough free radicals for reaction;
s3, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the solution concentration of 5%, adjusting the pH value of the treated water to 8.5, carrying out alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation;
s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding 5mL/L polyacrylamide solution with the concentration of 0.1%, and reacting and uniformly mixing the mixture for 1h under the slow stirring of 60 r/min;
s5, after being mixed uniformly, discharging the mixture into a sedimentation tank, standing and precipitating for 1h, filtering the supernatant with too high SS, adjusting the pH value to achieve that the fluorine content is less than 5mg/L and the fluorine content reaches the standard, discharging the filtrate directly after adjusting the pH value to 6 by a pH neutral adjusting tank, wherein the total fluorine content of the supernatant after precipitation is less than 1mg/L and the SS is less than 3 mg/L;
s6, pumping the sludge generated in the sedimentation tank into a filter press for dehydration treatment, returning the concentrated water to the front end of the process for treatment, and carrying out outsourcing treatment on the generated sludge cake.
Example 2
The water quality of fluorine-containing wastewater of a certain pharmaceutical factory: the suspended matter (SS) is 10-20 mg/L, the total fluorine is 20mg/L, the flow of the wastewater is 100t/h, and the operation is carried out for 10h every day. The implementation steps of the method are as follows:
s1, preparing a fluorine removal agent into a 5% aqueous solution; the grade of the defluorinating agent is GMS-F2;
s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 7; reacting the adjusted defluorinating agent in a pool for 0.5h under the condition of continuously stirring at 120r/min to generate enough free radicals for reaction;
s3, discharging the mixture into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the solution concentration of 5%, adjusting the pH value of the treated water to 9.5, carrying out alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation;
s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding a polyacrylamide solution with the concentration of 0.1 percent, wherein the adding amount is 6mL/L, and reacting and uniformly mixing the mixture for 1h under the slow stirring of 60 r/min;
s5, after being mixed uniformly, discharging the mixture into a sedimentation tank, standing and precipitating for 3 hours, filtering the supernatant with too high SS, adjusting the pH value to achieve that the fluorine content is less than 5mg/L and the fluorine content reaches the standard, discharging the filtrate directly after adjusting the pH value to 9 by a pH neutral adjusting tank, wherein the total fluorine content is less than 1mg/L and the SS is less than 3mg/L after precipitation;
s6, pumping the sludge generated in the sedimentation tank into a filter press for dehydration treatment, returning the concentrated water to the front end of the process for treatment, and carrying out outsourcing treatment on the generated sludge cake.
Example 3
The water quality of the fluoride-containing wastewater of a certain phosphate fertilizer plant is as follows: suspended matters (SS) are 10-20 mg/L, total fluorine is 20mg/L, the flow of wastewater is 100t/h, and the operation is carried out for 10h every day. The implementation steps of the method are as follows:
s1, preparing a fluorine removal agent into a 5% aqueous solution; the grade of the defluorinating agent is GMS-F2;
s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 6; reacting the adjusted defluorinating agent in a pool for 0.35h under the condition of continuously stirring at 120r/min to generate enough free radicals for reaction;
s3, discharging the mixture into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution with the solution concentration of 5%, adjusting the pH value of the treated water to 9, carrying out alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation;
s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding 5.5mL/L polyacrylamide solution with the concentration of 0.1%, and reacting and uniformly mixing the mixture for 1h under the slow stirring of 60 r/min;
s5, uniformly mixing, discharging into a sedimentation tank, standing and precipitating for 2 hours, filtering supernatant with over-high SS, precipitating to obtain supernatant with total fluorine content less than 1mg/L and SS less than 3mg/L, adjusting pH to achieve that the fluorine content is less than 5mg/L, discharging after reaching the standard, and adjusting pH to 7.5 by using a pH neutral adjusting tank to directly discharge;
s6, pumping the sludge generated in the sedimentation tank into a filter press for dehydration treatment, returning the concentrated water to the front end of the process for treatment, and carrying out outsourcing treatment on the generated sludge cake.
According to the invention, the precipitation technology and the capture technology are combined, and the synergistic effects of capture, coprecipitation and net capture adsorption are realized, so that the fluoride ion wastewater is obviously removed, the standard discharge is realized, and the subsequent resin equipment is not required to be added for advanced treatment, thereby greatly saving the cost.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A fluoride wastewater treatment process is characterized by comprising the following steps:
s1, preparing a fluorine removal agent into an aqueous solution with the concentration of 5% -15%;
s2, adding dilute sulfuric acid to adjust the pH value of the wastewater to 5-7; the adjusted defluorinating agent is put into a pool and reacts for 0.25 to 0.5 hour under continuous stirring;
s3, discharging into an alkali adding tank after the reaction is finished, adding a sodium hydroxide solution, adjusting the pH value of the treated water to 8.5-9.5, carrying out an alkali precipitation reaction for 1.0h, and carrying out homogeneous coprecipitation;
s4, discharging the mixture into a PAM flocculation tank after the reaction is finished, adding a polyacrylamide solution, and reacting and uniformly mixing the mixture for 1 hour under slow stirring;
and S5, after uniformly mixing, discharging into a sedimentation tank, standing and precipitating for 1-3h, filtering the supernatant with too high SS, adjusting the fluorine content of the filtrate to reach the discharge standard, and adjusting the pH to 6-9 by a pH neutral adjusting tank to directly discharge.
2. The fluoride waste water treatment process according to claim 1, characterized in that: the treatment process also comprises S6, pumping the sludge generated in the sedimentation tank into a filter press for dehydration treatment, returning the concentrated water to the front end of the process for treatment, and carrying out outsourcing treatment on the generated sludge cake.
3. The fluoride waste water treatment process according to claim 1, characterized in that: the mass ratio of the fluorine removing agent to the fluorine is 1.5: 1.
4. The fluoride waste water treatment process according to claim 1, characterized in that: the stirring reaction rate of S2 was 120 r/min.
5. The fluoride waste water treatment process according to claim 1, characterized in that: the concentration of the sodium hydroxide solution is 5%.
6. The fluoride waste water treatment process according to claim 1, characterized in that: the concentration of the polyacrylamide solution is 0.1%, and the adding amount is 5-6 mL/L.
7. The fluoride waste water treatment process according to claim 1, characterized in that: the slow stirring rate of S4 was 60 r/min.
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| CN202111612025.3A CN114477516A (en) | 2021-12-27 | 2021-12-27 | Fluoride wastewater treatment process |
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| CN202111612025.3A CN114477516A (en) | 2021-12-27 | 2021-12-27 | Fluoride wastewater treatment process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002316171A (en) * | 2001-04-18 | 2002-10-29 | Sony Corp | Method for treating fluorine-containing wastewater |
| CN105084591A (en) * | 2015-08-11 | 2015-11-25 | 安徽锦洋氟化学有限公司 | High-fluoride-containing wastewater treatment technology in fluorine chemical industry |
| CN110040878A (en) * | 2019-05-14 | 2019-07-23 | 山东环瑞生态科技有限公司 | A kind of fluoride waste deep treatment method |
| CN110372075A (en) * | 2019-05-14 | 2019-10-25 | 山东环瑞生态科技有限公司 | A kind of new and effective fluorine removal medicament and its application |
| CN112607917A (en) * | 2020-12-30 | 2021-04-06 | 九江天赐高新材料有限公司 | Method and system for treating fluorine-containing wastewater |
-
2021
- 2021-12-27 CN CN202111612025.3A patent/CN114477516A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002316171A (en) * | 2001-04-18 | 2002-10-29 | Sony Corp | Method for treating fluorine-containing wastewater |
| CN105084591A (en) * | 2015-08-11 | 2015-11-25 | 安徽锦洋氟化学有限公司 | High-fluoride-containing wastewater treatment technology in fluorine chemical industry |
| CN110040878A (en) * | 2019-05-14 | 2019-07-23 | 山东环瑞生态科技有限公司 | A kind of fluoride waste deep treatment method |
| CN110372075A (en) * | 2019-05-14 | 2019-10-25 | 山东环瑞生态科技有限公司 | A kind of new and effective fluorine removal medicament and its application |
| CN112607917A (en) * | 2020-12-30 | 2021-04-06 | 九江天赐高新材料有限公司 | Method and system for treating fluorine-containing wastewater |
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