CN111847777A - Fluorine-containing pickling wastewater treatment process - Google Patents
Fluorine-containing pickling wastewater treatment process Download PDFInfo
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- CN111847777A CN111847777A CN202010667991.4A CN202010667991A CN111847777A CN 111847777 A CN111847777 A CN 111847777A CN 202010667991 A CN202010667991 A CN 202010667991A CN 111847777 A CN111847777 A CN 111847777A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 44
- 239000011737 fluorine Substances 0.000 title claims abstract description 44
- 238000005554 pickling Methods 0.000 title claims abstract description 32
- 230000008569 process Effects 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000001556 precipitation Methods 0.000 claims abstract description 70
- 239000002351 wastewater Substances 0.000 claims abstract description 66
- 238000005273 aeration Methods 0.000 claims abstract description 46
- 230000003647 oxidation Effects 0.000 claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
- 238000000926 separation method Methods 0.000 claims abstract description 27
- 230000000694 effects Effects 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000010979 pH adjustment Methods 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 11
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 238000005189 flocculation Methods 0.000 claims description 11
- 230000016615 flocculation Effects 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229940037003 alum Drugs 0.000 claims description 10
- 238000006482 condensation reaction Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 8
- 230000003197 catalytic effect Effects 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 235000011148 calcium chloride Nutrition 0.000 claims description 5
- 238000010668 complexation reaction Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 244000005700 microbiome Species 0.000 claims description 5
- 239000013049 sediment Substances 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 3
- 239000003814 drug Substances 0.000 abstract description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 6
- 238000006115 defluorination reaction Methods 0.000 abstract description 5
- 238000009388 chemical precipitation Methods 0.000 abstract description 4
- 159000000007 calcium salts Chemical class 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- -1 SO42- Chemical class 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000029219 regulation of pH Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
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- 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
-
- 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
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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Abstract
The invention discloses a fluorine-containing pickling wastewater treatment process, which specifically comprises the following steps: s1, aeration treatment, S2, primary adjustment, S3, primary precipitation, S4, secondary precipitation, S5, tertiary precipitation, S6, primary sludge-water separation, S7, secondary adjustment, S8, quaternary precipitation, S9, primary precipitation and secondary sludge-water separation and S10 and oxidation treatment. The treatment process of the fluorine-containing pickling wastewater combines a chemical precipitation method and an aluminum salt defluorination method, has the advantages of good treatment effect on the fluorine-containing pickling wastewater, simple operation and low treatment cost, simultaneously utilizes different removal principles of calcium salt and aluminum salt on the fluorine-containing pickling wastewater to be mixed for use, saves the using amount of a medicament, fully exerts the precipitation effect of the medicament on the fluorine-containing pickling wastewater, combines a COD treatment process, ensures the effluent quality and improves the treatment efficiency, and realizes advanced automatic operation by the application of a large amount of electronic monitoring equipment.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a fluorine-containing pickling wastewater treatment process.
Background
At present, there are several treatment methods for high-concentration fluorine-containing wastewater at home and abroad, and the common treatment methods include an adsorption method and a precipitation method. Wherein, the precipitation method is mainly applied to the treatment of industrial fluorine-containing wastewater, and the adsorption method is mainly applied to the treatment of drinking water.
The traditional defluorination method mainly comprises a chemical precipitation method, an aluminum salt defluorination method and an adsorption method at present, wherein the chemical precipitation method is simple, convenient to treat and low in cost, but the generated CaF2 is wrapped on the surface of Ca (OH)2 particles so that the Ca (OH)2 particles cannot be fully used, the medicine dosage is large, the concentration of effluent F-is high and difficult to reach the standard, sludge is slowly settled and is difficult to dewater; although the aluminum salt defluorination method has small dosage of medicament and large treatment capacity, and can reach the national discharge standard after one-time treatment, the flocculation precipitation treatment cost is higher, the generated sludge amount is more, the F-removal effect is greatly influenced by operation factors such as stirring conditions, settling time and the like and anions such as SO42-, Cl-and the like in water, and the effluent quality is unstable; although the adsorption method has simple process, simple and convenient operation, no toxicity, little pollution and stable adsorption capacity, the adsorption capacity of the filter material is small, the treatment efficiency is low, the treatment time is long, the exchange capacity is reduced after some filter materials are regenerated, and the reuse rate is low.
Disclosure of Invention
The invention aims to provide a fluorine-containing pickling wastewater treatment process to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a fluorine-containing pickling wastewater treatment process specifically comprises the following steps:
s1, aeration treatment: the fluorine-containing pickling water enters the regulating reservoir firstly, aeration stirring and PH detection are carried out on the wastewater, and the aeration can improve the COD treatment effect at the later stage of the wastewater.
S2, primary adjustment: and (3) adding Ca (OH)2 into the wastewater after the aeration treatment for pH adjustment.
S3, primary precipitation: after the pH adjustment is judged to be finished by the intelligent expert control system, the wastewater enters a second reaction tank and CaCl2 is added to provide Ca2+ for the system and reacts with F-to form CaF2 precipitate.
S4, secondary precipitation: and the wastewater after the primary precipitation enters a third reaction tank, PAC is added, and CaF2 is subjected to flocculation reaction under the action of PAC to form alum floc precipitates.
S5, third precipitation: and enabling the wastewater subjected to secondary precipitation to form alum blossom precipitate and then enter a fourth reaction tank, and adding PAM into the fourth reaction tank to perform a condensation reaction to form large floc precipitate.
S6, primary sludge-water separation: and the wastewater after the third precipitation enters an inclined tube sedimentation tank for mud-water separation, the precipitated clear water enters a subsequent dosing tank for adding a high-efficiency fluorine removal agent, and F-ions remained in the water under the complexation reaction of the high-efficiency fluorine removal agent are complexed and captured.
S7, secondary adjustment: and the clear water of the sediment after the primary mud-water separation enters a PH adjusting tank for secondary PH adjustment.
S8, four times of precipitation: and the wastewater after secondary adjustment enters a flocculation tank II and PAM is added for a condensation reaction to condense the precipitate after complex capture into a larger floc precipitate.
S9, performing five times of precipitation and secondary sludge-water separation: and the clear water after the fourth precipitation enters an inclined plate sedimentation tank for secondary precipitation, and the mud and the water are separated again.
S10, oxidation treatment: and (3) the clear water of the precipitate after the five-time precipitation and the secondary mud-water separation enters an integrated oxidation device, and organic matters in the water are subjected to aerobic oxidation and catalytic oxidation in the oxidation device and are removed from the water body by utilizing microorganisms.
Further, in the aeration treatment step, an aeration pipe is arranged in the regulating tank to aerate and stir the wastewater.
Further, in the aeration treatment step, a PH detector is arranged in the regulating tank to detect the PH of the wastewater.
Further, in the aeration treatment step, the PH detector is connected with an intelligent expert control system to provide initial adjustment data for the system.
Further, the pH value of the wastewater in the primary adjusting step is adjusted to be about 10.
Furthermore, a PH detector is arranged in the reaction tank in the primary adjustment step to provide final adjustment data for the intelligent expert control system.
Further, the dosage of PAM in the three precipitation steps is 1000 PPM.
Further, the pH value of the clear water precipitated in the secondary adjustment step is adjusted to be about neutral 7.
Furthermore, the quality of the effluent treated by the integrated oxidation equipment in the oxidation treatment step reaches F < - > less than 8mg/L, and the COD is less than 50mg/L, so that the direct discharge requirement of sewage is met.
Compared with the prior art, the invention has the beneficial effects that:
1. the aeration in the adjusting tank can fully mix the water quality and improve the subsequent COD treatment effect. The PH detector arranged in the regulating reservoir provides PH regulation and medicine adding control for the intelligent expert control system, so that the system can conveniently control the accurate medicine adding amount.
2. In the process, after the inclined tube precipitates water, the efficient defluorinating agent is added again to further reduce F < - > in the water, stabilize the quality of the discharged water and reach the discharge standard.
3. The process comprises the steps of discharging sludge in the inclined tube sedimentation tank into the inclined plate sedimentation tank for secondary sedimentation, and then, feeding the sludge into the sludge tank for filter pressing, so that the F-content in the sludge can be reduced.
4. The process sets aerobic oxidation and catalytic oxidation in the integrated oxidation equipment to decompose macromolecular organic matters and refractory organic matters in the water body into micromolecular organic matters, reduce COD and improve subsequent treatment effect.
5. The MBR treatment procedure is set in the integrated oxidation equipment, so that the biochemical organic pollutants in the water body can be effectively reduced, and the effluent can meet the discharge requirement.
Drawings
FIG. 1 is a flow chart showing the steps of a process for treating waste water containing fluorine pickling according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides the following technical solutions:
a fluorine-containing pickling wastewater treatment process specifically comprises the following steps:
s1, aeration treatment: the fluorine-containing pickling water enters the regulating reservoir firstly, aeration stirring and PH detection are carried out on the wastewater, and the aeration can improve the COD treatment effect at the later stage of the wastewater.
S2, primary adjustment: and (3) adding Ca (OH)2 into the wastewater after the aeration treatment for pH adjustment.
S3, primary precipitation: after the pH adjustment is judged to be finished by the intelligent expert control system, the wastewater enters a second reaction tank and CaCl2 is added to provide Ca2+ for the system and reacts with F-to form CaF2 precipitate.
S4, secondary precipitation: and the wastewater after the primary precipitation enters a third reaction tank, PAC is added, and CaF2 is subjected to flocculation reaction under the action of PAC to form alum floc precipitates.
S5, third precipitation: and enabling the wastewater subjected to secondary precipitation to form alum blossom precipitate and then enter a fourth reaction tank, and adding PAM into the fourth reaction tank to perform a condensation reaction to form large floc precipitate.
S6, primary sludge-water separation: and the wastewater after the third precipitation enters an inclined tube sedimentation tank for mud-water separation, the precipitated clear water enters a subsequent dosing tank for adding a high-efficiency fluorine removal agent, and F-ions remained in the water under the complexation reaction of the high-efficiency fluorine removal agent are complexed and captured.
S7, secondary adjustment: and the clear water of the sediment after the primary mud-water separation enters a PH adjusting tank for secondary PH adjustment.
S8, four times of precipitation: and the wastewater after secondary adjustment enters a flocculation tank II and PAM is added for a condensation reaction to condense the precipitate after complex capture into a larger floc precipitate.
S9, performing five times of precipitation and secondary sludge-water separation: and the clear water after the fourth precipitation enters an inclined plate sedimentation tank for secondary precipitation, and the mud and the water are separated again.
S10, oxidation treatment: and (3) the clear water of the precipitate after the five-time precipitation and the secondary mud-water separation enters an integrated oxidation device, and organic matters in the water are subjected to aerobic oxidation and catalytic oxidation in the oxidation device and are removed from the water body by utilizing microorganisms.
And in the aeration treatment step, an aeration pipe is arranged in the regulating tank to carry out aeration stirring on the wastewater.
And in the aeration treatment step, a PH detector is arranged in the regulating tank to detect the PH of the wastewater.
And in the aeration treatment step, the PH detector is connected with the intelligent expert control system to provide initial adjustment data for the system.
And the PH of the wastewater in the primary adjustment step is adjusted to be about 10.
And in the primary adjustment step, a PH detector is arranged in the reaction tank to provide final adjustment data for the intelligent expert control system.
And the dosage of PAM in the three precipitation steps is 1000 PPM.
And in the secondary adjustment step, the pH value of the precipitated clear water is adjusted to be about neutral 7.
The quality of the effluent water treated by the integrated oxidation equipment in the oxidation treatment step reaches F < - > less than 8mg/L, and the COD is less than 50mg/L, so that the direct discharge requirement of sewage is met.
Example 2
Referring to fig. 1, the present invention provides the following technical solutions:
a fluorine-containing pickling wastewater treatment process specifically comprises the following steps:
s1, aeration treatment: the fluorine-containing pickling water enters the regulating reservoir firstly, aeration stirring and PH detection are carried out on the wastewater, and the aeration can improve the COD treatment effect at the later stage of the wastewater.
S2, primary adjustment: and (3) adding Ca (OH)2 into the wastewater after the aeration treatment for pH adjustment.
S3, primary precipitation: after the pH adjustment is judged to be finished by the intelligent expert control system, the wastewater enters a second reaction tank and CaCl2 is added to provide Ca2+ for the system and reacts with F-to form CaF2 precipitate.
S4, secondary precipitation: and the wastewater after the primary precipitation enters a third reaction tank, PAC is added, and CaF2 is subjected to flocculation reaction under the action of PAC to form alum floc precipitates.
S5, third precipitation: and enabling the wastewater subjected to secondary precipitation to form alum blossom precipitate and then enter a fourth reaction tank, and adding PAM into the fourth reaction tank to perform a condensation reaction to form large floc precipitate.
S6, primary sludge-water separation: and the wastewater after the third precipitation enters an inclined tube sedimentation tank for mud-water separation, the precipitated clear water enters a subsequent dosing tank for adding a high-efficiency fluorine removal agent, and F-ions remained in the water under the complexation reaction of the high-efficiency fluorine removal agent are complexed and captured.
S7, secondary adjustment: and the clear water of the sediment after the primary mud-water separation enters a PH adjusting tank for secondary PH adjustment.
S8, four times of precipitation: and the wastewater after secondary adjustment enters a flocculation tank II and PAM is added for a condensation reaction to condense the precipitate after complex capture into a larger floc precipitate.
S9, performing five times of precipitation and secondary sludge-water separation: and the clear water after the fourth precipitation enters an inclined plate sedimentation tank for secondary precipitation, and the mud and the water are separated again.
S10, oxidation treatment: and (3) the clear water of the precipitate after the five-time precipitation and the secondary mud-water separation enters an integrated oxidation device, and organic matters in the water are subjected to aerobic oxidation and catalytic oxidation in the oxidation device and are removed from the water body by utilizing microorganisms.
And in the aeration treatment step, an aeration pipe is arranged in the regulating tank to carry out aeration stirring on the wastewater.
And in the aeration treatment step, a PH detector is arranged in the regulating tank to detect the PH of the wastewater.
And in the aeration treatment step, the PH detector is connected with the intelligent expert control system to provide initial adjustment data for the system.
And the PH value of the wastewater in the primary adjusting step is adjusted to 9.
And in the primary adjustment step, a PH detector is arranged in the reaction tank to provide final adjustment data for the intelligent expert control system.
And the dosage of PAM in the three precipitation steps is 1000 PPM.
And in the secondary adjustment step, the pH value of the precipitated clear water is adjusted to 6.
The quality of the effluent water treated by the integrated oxidation equipment in the oxidation treatment step reaches F < - > less than 8mg/L, and the COD is less than 50mg/L, so that the direct discharge requirement of sewage is met.
Example 3
Referring to fig. 1, the present invention provides the following technical solutions:
a fluorine-containing pickling wastewater treatment process specifically comprises the following steps:
S1, aeration treatment: the fluorine-containing pickling water enters the regulating reservoir firstly, aeration stirring and PH detection are carried out on the wastewater, and the aeration can improve the COD treatment effect at the later stage of the wastewater.
S2, primary adjustment: and (3) adding Ca (OH)2 into the wastewater after the aeration treatment for pH adjustment.
S3, primary precipitation: after the pH adjustment is judged to be finished by the intelligent expert control system, the wastewater enters a second reaction tank and CaCl2 is added to provide Ca2+ for the system and reacts with F-to form CaF2 precipitate.
S4, secondary precipitation: and the wastewater after the primary precipitation enters a third reaction tank, PAC is added, and CaF2 is subjected to flocculation reaction under the action of PAC to form alum floc precipitates.
S5, third precipitation: and enabling the wastewater subjected to secondary precipitation to form alum blossom precipitate and then enter a fourth reaction tank, and adding PAM into the fourth reaction tank to perform a condensation reaction to form large floc precipitate.
S6, primary sludge-water separation: and the wastewater after the third precipitation enters an inclined tube sedimentation tank for mud-water separation, the precipitated clear water enters a subsequent dosing tank for adding a high-efficiency fluorine removal agent, and F-ions remained in the water under the complexation reaction of the high-efficiency fluorine removal agent are complexed and captured.
S7, secondary adjustment: and the clear water of the sediment after the primary mud-water separation enters a PH adjusting tank for secondary PH adjustment.
S8, four times of precipitation: and the wastewater after secondary adjustment enters a flocculation tank II and PAM is added for a condensation reaction to condense the precipitate after complex capture into a larger floc precipitate.
S9, performing five times of precipitation and secondary sludge-water separation: and the clear water after the fourth precipitation enters an inclined plate sedimentation tank for secondary precipitation, and the mud and the water are separated again.
S10, oxidation treatment: and (3) the clear water of the precipitate after the five-time precipitation and the secondary mud-water separation enters an integrated oxidation device, and organic matters in the water are subjected to aerobic oxidation and catalytic oxidation in the oxidation device and are removed from the water body by utilizing microorganisms.
And in the aeration treatment step, an aeration pipe is arranged in the regulating tank to carry out aeration stirring on the wastewater.
And in the aeration treatment step, a PH detector is arranged in the regulating tank to detect the PH of the wastewater.
And in the aeration treatment step, the PH detector is connected with the intelligent expert control system to provide initial adjustment data for the system.
And the PH of the wastewater in the primary adjustment step is adjusted to be about 11.
And in the primary adjustment step, a PH detector is arranged in the reaction tank to provide final adjustment data for the intelligent expert control system.
And the dosage of PAM in the three precipitation steps is 1000 PPM.
And in the secondary adjustment step, the pH value of the precipitated clear water is adjusted to 8.
The quality of the effluent water treated by the integrated oxidation equipment in the oxidation treatment step reaches F < - > less than 8mg/L, and the COD is less than 50mg/L, so that the direct discharge requirement of sewage is met.
The treatment process of the fluorine-containing pickling wastewater combines a chemical precipitation method and an aluminum salt defluorination method, has the advantages of good treatment effect on the fluorine-containing pickling wastewater, simple operation and low treatment cost, simultaneously utilizes different removal principles of calcium salt and aluminum salt on the fluorine-containing pickling wastewater to be mixed for use, saves the using amount of a medicament, fully exerts the precipitation effect of the medicament on the fluorine-containing pickling wastewater, combines a COD treatment process, ensures the effluent quality and improves the treatment efficiency, and realizes advanced automatic operation by the application of a large amount of electronic monitoring equipment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A fluorine-containing pickling wastewater treatment process is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, aeration treatment: the fluorine-containing pickling water enters the regulating reservoir firstly, aeration stirring and PH detection are carried out on the wastewater, and the aeration can improve the COD treatment effect at the later stage of the wastewater.
S2, primary adjustment: and (3) adding Ca (OH)2 into the wastewater after the aeration treatment for pH adjustment.
S3, primary precipitation: after the pH adjustment is judged to be finished by the intelligent expert control system, the wastewater enters a second reaction tank and CaCl2 is added to provide Ca2+ for the system and reacts with F-to form CaF2 precipitate.
S4, secondary precipitation: and the wastewater after the primary precipitation enters a third reaction tank, PAC is added, and CaF2 is subjected to flocculation reaction under the action of PAC to form alum floc precipitates.
S5, third precipitation: and enabling the wastewater subjected to secondary precipitation to form alum blossom precipitate and then enter a fourth reaction tank, and adding PAM into the fourth reaction tank to perform a condensation reaction to form large floc precipitate.
S6, primary sludge-water separation: and the wastewater after the third precipitation enters an inclined tube sedimentation tank for mud-water separation, the precipitated clear water enters a subsequent dosing tank for adding a high-efficiency fluorine removal agent, and F-ions remained in the water under the complexation reaction of the high-efficiency fluorine removal agent are complexed and captured.
S7, secondary adjustment: and the clear water of the sediment after the primary mud-water separation enters a PH adjusting tank for secondary PH adjustment.
S8, four times of precipitation: and the wastewater after secondary adjustment enters a flocculation tank II and PAM is added for a condensation reaction to condense the precipitate after complex capture into a larger floc precipitate.
S9, performing five times of precipitation and secondary sludge-water separation: and the clear water after the fourth precipitation enters an inclined plate sedimentation tank for secondary precipitation, and the mud and the water are separated again.
S10, oxidation treatment: and (3) the clear water of the precipitate after the five-time precipitation and the secondary mud-water separation enters an integrated oxidation device, and organic matters in the water are subjected to aerobic oxidation and catalytic oxidation in the oxidation device and are removed from the water body by utilizing microorganisms.
2. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and in the aeration treatment step, an aeration pipe is arranged in the regulating tank to carry out aeration stirring on the wastewater.
3. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and in the aeration treatment step, a PH detector is arranged in the regulating tank to detect the PH of the wastewater.
4. The fluorine-containing pickling wastewater treatment process according to claim 3, characterized in that: and in the aeration treatment step, the PH detector is connected with the intelligent expert control system to provide initial adjustment data for the system.
5. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and the PH of the wastewater in the primary adjustment step is adjusted to be about 10.
6. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and in the primary adjustment step, a PH detector is arranged in the reaction tank to provide final adjustment data for the intelligent expert control system.
7. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and the dosage of PAM in the three precipitation steps is 1000 PPM.
8. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: and in the secondary adjustment step, the pH value of the precipitated clear water is adjusted to be about neutral 7.
9. The fluorine-containing pickling wastewater treatment process according to claim 1, characterized in that: the quality of the effluent water treated by the integrated oxidation equipment in the oxidation treatment step reaches F < - > less than 8mg/L, and the COD is less than 50mg/L, so that the direct discharge requirement of sewage is met.
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