CN216890431U - High-concentration fluoride removing combined device in industrial wastewater - Google Patents
High-concentration fluoride removing combined device in industrial wastewater Download PDFInfo
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- CN216890431U CN216890431U CN202220063571.XU CN202220063571U CN216890431U CN 216890431 U CN216890431 U CN 216890431U CN 202220063571 U CN202220063571 U CN 202220063571U CN 216890431 U CN216890431 U CN 216890431U
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- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 title claims abstract description 27
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 239000002351 wastewater Substances 0.000 claims abstract description 44
- 238000006115 defluorination reaction Methods 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000010802 sludge Substances 0.000 claims abstract description 24
- 238000005189 flocculation Methods 0.000 claims abstract description 23
- 230000016615 flocculation Effects 0.000 claims abstract description 23
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 16
- 239000001110 calcium chloride Substances 0.000 claims abstract description 12
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 12
- 238000009287 sand filtration Methods 0.000 claims abstract description 10
- 239000012492 regenerant Substances 0.000 claims abstract description 8
- 239000002253 acid Substances 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000004939 coking Methods 0.000 claims description 5
- 238000009713 electroplating Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 1
- 229910052731 fluorine Inorganic materials 0.000 abstract description 26
- 239000011737 fluorine Substances 0.000 abstract description 26
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 239000011575 calcium Substances 0.000 description 21
- 239000000463 material Substances 0.000 description 7
- 238000001556 precipitation Methods 0.000 description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 229910001634 calcium fluoride Inorganic materials 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- -1 smelting Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 159000000007 calcium salts Chemical class 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910021419 crystalline silicon Inorganic materials 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910003158 γ-Al2O3 Inorganic materials 0.000 description 2
- 206010054196 Affect lability Diseases 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 206010016818 Fluorosis Diseases 0.000 description 1
- 206010019233 Headaches Diseases 0.000 description 1
- 206010061218 Inflammation Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 229910052586 apatite Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 208000015114 central nervous system disease Diseases 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 208000004042 dental fluorosis Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000007785 strong electrolyte Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Removal Of Specific Substances (AREA)
Abstract
The utility model discloses a high-concentration fluoride removal combined device in industrial wastewater, comprising an adjusting tank and a device 1#Reaction tank, 2#The reaction tank, the flocculation tank, the sedimentation tank, the neutralization tank, the sand filtration tank, the deep defluorination tank and the clean water tank are connected in sequence through a conveying pipeline, and Ca (OH)2Tank and 1#The reaction tanks are connected with each other and are filled with CaCl2Tank and2#the reaction tank is connected, the PAC tank and the PAM tank are respectively connected with the flocculation tank, the acid tank is connected with the neutralization tank and the flocculation tank, the regenerant tank is connected with the deep defluorination tank, the sedimentation tank, the concentration tank and the sludge dewatering machine are sequentially connected through a conveying pipeline, and the sedimentation tank, the sand filtration tank, the deep defluorination tank, the sludge dewatering machine and the reaction tank are 1#The reaction tanks are connected. The method improves the fluorine removal effect, is easy to implement and is suitable for treating high-concentration fluorine-containing wastewater.
Description
Technical Field
The utility model belongs to the technical field of environmental water treatment, and particularly relates to a high-concentration fluoride removal combined device for industrial wastewater.
Background
Fluorine in nature exists mostly in a compound state, mainly exists in fluorite, apatite and cryolite, and is widely applied to industries such as smelting, chemical fertilizers, glass manufacturing and the like. The industrial fluorine-containing wastewater is from industries such as exploitation of fluorine-containing ores, coke, smelting, glass, fertilizer, electroplating, electronics, solar cell production and the like. The industrial fluorine-containing wastewater has complex components and wide concentration coverage range. In the coking industry, the fluorine-containing species released during coking of coal are present in the remaining ammonia as fluorides. Fluorite is used as a fluxing agent in smelting processes of blast furnaces and converters for smelting steel in the smelting industry. In the electroplating industry and the glass manufacturing industry, hydrofluoric acid is adopted for pretreatment of plated parts to generate high-fluorine acidic wastewater. In the electronics industry, high purity hydrofluoric acid is used as an important raw material for cleaning semiconductor materials. In the solar cell industry, in the production process of crystalline silicon solar cells, hydrofluoric acid is used for corroding, texturing and washing the surface of crystalline silicon, so that high-fluorine acidic wastewater is generated. F of the main wastewater discharge outlet due to different wastewater concentrations generated in different production stages-The concentration varies continuously, ranging from hundreds of milligrams per liter to thousands of milligrams per liter. Fluoride has a very strong irritating and erosive effect on the eyes, nose, skin and throat of a person in contact with the fluoride, and is easy to cause congestion and inflammation of mucous membranes of the eyes, nose and throat. Regional fluorosis also brings serious harm to people, and central nervous system diseases such as emotional instability, headache, hypomnesis and the like are brought to patients.
At present, a device for removing fluoride in wastewater is mainly a lime and calcium chloride combined precipitation device, and the principle is that slaked lime milk is added into fluorine-containing wastewater to be fully alkaline, and strong electrolyte calcium chloride is utilized to precipitate F-. Due to CaF formation2The crystals have small particle size and are difficult to filter, and macromolecular flocculants such as aluminum salt or aluminate and high molecular flocculant are usually added for solid-liquid separationMolecular polymer, and then the formed floccule is settled and separated. The traditional high molecular polymer can not effectively flocculate and remove complex fluoride formed in the treatment process, so that the content of the fluoride in treated water is higher, and the fluoride is difficult to stably reach the standard and be discharged. Therefore, when the calcium salt and the aluminum salt are used for jointly treating the fluorine-containing wastewater, if a deep fluorine removal device is added, the fluoride in the water can be effectively removed. Therefore, it is highly desirable to design a device capable of deeply removing fluorine for industrial wastewater treatment.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model discloses a high-concentration fluoride removing combined device in industrial wastewater, which effectively removes high-concentration fluoride in the industrial wastewater in a more efficient device connection mode. The utility model relates to a combined device of 'double calcium + flocculation precipitation + neutralization filtration + deep defluorination' for realizing deep defluorination, wherein the 'double calcium' is 1#And 2#Respectively adding Ca (OH) into the reaction tank2And CaCl2Chemical medicine, etc. to form fluoride precipitate. The flocculation precipitation is that flocculating agent PAC and coagulant aid PAM are added into a flocculation reaction tank to ensure that fine calcium fluoride in the solution is precipitated to form flocculating constituents with larger particles so as to achieve the purpose of improving the sedimentation speed. And (3) the wastewater enters a high-density settling zone for mud-water separation, part of unreacted and complete reagents flow back to the front end, and the concentrated sludge is sent to a centrifuge for treatment and then is transported outside. The 'neutralization filtration' is that the wastewater enters a neutralization adjustment area, the pH value of the wastewater is adjusted to 6-9, and then the wastewater enters a filtration system after being lifted to effectively remove suspended matters in the wastewater. "deep defluorination" means the entry of wastewater into a deep defluorination apparatus, F-F in the wastewater can be further reduced by carrying out deep ion exchange reaction with the modified defluorination filter material-Content of F ensuring effluent-The concentration meets the drainage requirement.
(II) technical scheme
In order to achieve the purpose, the utility model discloses a combined device for removing high-concentration fluoride in industrial wastewater. It includes: regulating reservoir, 1#Reaction tank, 2#Reaction tank, flocculation tank, sedimentation tank, neutralization tank, sand filtration tank, deep defluorination tank, clean water tank, sludge treatment system (including concentration tank and sludge dewatering machine), Ca (OH)2Pot, CaCl2A tank, a PAC tank, a PAM tank, an acid tank, and a regenerant tank; the connection mode is an adjusting tank 1#Reaction tank, 2#The reaction tank, the flocculation tank, the sedimentation tank, the neutralization tank, the sand filtration tank, the deep defluorination tank and the clean water tank are connected in sequence through a conveying pipeline, and Ca (OH)2Tank and 1#The reaction tanks are connected with each other and are filled with CaCl2Tank and 2#The reaction tank is connected, the PAC tank and the PAM tank are respectively connected with the flocculation tank, the acid tank is connected with the neutralization tank and the flocculation tank, the regenerant tank is connected with the deep defluorination tank, the sedimentation tank, the concentration tank and the sludge dewatering machine are sequentially connected through a conveying pipeline, and the sedimentation tank, the sand filtration tank, the deep defluorination tank, the sludge dewatering machine and the reaction tank are 1#The reaction tanks are connected. And a pump for driving the wastewater to flow is arranged on the conveying pipeline.
Before the device is used for defluorination, the pretreatment of wastewater containing fluorine is needed, the water quantity and the water quality of the wastewater are adjusted, and conditions are provided for the stability of subsequent treatment. Adjusting the fluoride concentration in the collected wastewater to F-Calculated as 150mg/L, obtaining the pretreated fluorine-containing wastewater.
The fluorine-containing wastewater enters the device 1 after being regulated by a regulating tank#In the reaction tank, Ca (OH)2The solution (with concentration of 10%) is delivered to the reactor 1 by an automatic dosing system#The reaction tank is the same as F-Chemical reaction is carried out to generate CaF which is difficult to dissolve in water2Precipitating, the effective rate of removing fluorine ions reaches more than 70%, the concentration of the fluorine ions is reduced from 130mg/L to 30mg/L, and a certain amount of crystal seeds required by the flocculation of precipitates are generated at the same time.
1#The mud-water mixture in the reaction tank enters 2#Reaction tank, 2#CaCl with better solubility is added into the reaction tank2(concentration: 30%) was further mixed with the remaining F-Reaction to CaF2Precipitating to reduce F in wastewater-And (4) content. Make the effluent F-The content is less than 15 mg/L.
2#The mud-water mixture in the reaction tank enters a flocculation reaction tank whereAdding flocculant PAC (concentration of 10%) and coagulant aid PAM (concentration of 0.1%), and promoting fine CaF in solution by self-adsorption and bridging action and polymerization of seed crystal formed in front section2Precipitating to form flocculating constituent with larger particles to achieve the purpose of increasing the sedimentation speed, controlling the pH value of the wastewater within the range of 8-9 before the wastewater enters a flocculation reaction area to ensure the best flocculation effect and ensure that the effluent F-The content is less than 10 mg/L.
The wastewater enters a high-density sedimentation area for mud-water separation, the solid-liquid separation purpose is achieved through sedimentation, and simultaneously sludge is precipitated and concentrated. A special inclined tube sedimentation facility is arranged to accelerate the sludge sedimentation and a special sludge scraping system is arranged to efficiently remove the sludge, a sludge reflux pump is arranged at the same time, and partial unreacted and complete medicament flows back to the front end 1 of the combined device#A reaction tank for fully utilizing Ca (OH) which does not take part in the reaction in the sludge2The dosage can be saved by 10-30% by continuously participating in the reaction.
Because Ca (OH) is excessively added into the front-stage device2The pH value of the wastewater is alkaline, and the pH value of the wastewater is automatically adjusted to be in a range of 6-9 by a sulfuric acid adding device (the concentration is 5%) under the control of a PLC in a neutralization reaction area.
The wastewater enters a filtering system to effectively remove suspended matters in the wastewater. The filter material is improved high-purity quartz sand, and the specification of the filter material is 2-4/4-8/8-16 mm.
The deep defluorination system integrates filtration, adsorption, exchange and regeneration into a whole and operates in a pressure type concurrent adsorption and countercurrent regeneration mode. F in waste water-Activated alumina (gamma-Al) as modified defluorinating filter material2O3Generally from Al2O3·nH2Prepared by heating and dehydrating O) to carry out deep ion exchange reaction, so that fluorine ions are adsorbed on a filter material with larger specific surface area, and F in wastewater can be further reduced-The content ensures that the concentration of the fluorinion in the effluent is less than 5mg/L, thereby meeting the discharge requirement of the wastewater. F is adsorbed by the defluorination filter material-The sewage interception capability of the filter material is continuously reduced, and F in the wastewater-The concentration is gradually close to the critical value, at the moment, the defluorination unit enters a regeneration state, and the wastewater is regeneratedReflux to the front reaction zone of the combined apparatus 1#The reaction tank is further processed. The regenerant is modified polyaluminium sulfate [ A1 ]2(OH)m(S04)3-]n(concentration: 4%).
The sludge is discharged into a concentration tank and then is subjected to gravity settling concentration, the water content can be reduced from 99 percent to 96 percent, the sludge enters a sludge dewatering machine for treatment, the dried sludge is transported outside, and the waste liquid generated by the sludge dewatering machine returns to the front-end reaction zone 1 of the combined device#And (4) a reaction tank.
The chemical equation involved in the utility model is as follows:
1. the double calcium mechanism:
Ca(OH)2+2F-＝CaF2+2OH-
CaCl2+2F-＝CaF2+2Cl-
2. the flocculation and precipitation mechanism is as follows:
F-can be reacted with Al3+Etc. are formed from AlF2+、AlF2+、AlF3To AlF6 3-A total of 6 complexes, complex-sedimented to remove F-。
3. The ion exchange mechanism:
using gamma-Al2O3The principle of removing fluorine is that fluorine is adsorbed on the surface of the adsorbent to generate insoluble fluoride, and SO on the adsorbent is removed4 2–Exchangeable water F-And HCO3 ˉAnd other anions.
The utility model has the following advantages:
(1) firstly adding Ca (OH)2Precipitation of F-Then adding CaCl2To make Ca in water2+Excess, continue to precipitate F-. The utility model reduces Ca (OH)2The dosage of (2) reduces CaF2Precipitate pair Ca (OH)2The problem of coating on the surface of the particles.
(2) The utility model reduces the dosage of the flocculating agent, improves the defluorination effect and reduces the defluorination treatment cost.
(3) Small particle gamma-Al2O3The specific surface area is large, the defluorination effect can be improved, the water treatment cost is reduced, and when the defluorination capacity of the activated alumina adsorbent cannot reach the standard, the aluminum sulfate can be prepared into a regenerant with the concentration of 4 percent to be regenerated and then reused.
(4) The utility model firstly adds Ca (OH)2Precipitation of F-In order to control the pH of the wastewater not to rise too much, Ca (OH)2Adding a certain amount of CaCl2To make Ca in water2+Excess of F-Precipitate, reduce Ca (OH)2The addition amount of the calcium salt is reduced compared with the traditional calcium salt precipitation method2Precipitate pair Ca (OH)2The problem of coating on the surface of the particles; the utility model utilizes the deep fluorine removal system, improves the fluorine removal effect and reduces the fluorine removal treatment cost. The method has the advantages of simple control parameters, mild conditions and easy implementation, and is suitable for treating high-concentration fluorine-containing wastewater.
Drawings
FIG. 1 is a diagram of a high concentration fluoride removal assembly.
Detailed Description
[ example 1 ]
The coking wastewater contains high-concentration fluoride, and the wastewater treatment scale is 520m3H, feed water fluoride (as F)-Calculated) the concentration was 100 mg/L. A regulating reservoir is built, 1#Reaction tank, 2#Reaction tank, flocculation tank, sedimentation tank, neutralization tank, sand filtration tank, deep defluorination tank, clean water tank and Ca (OH)2Pot, CaCl2Tank, PAC tank, PAM tank, acid tank, regenerant tank, concentration tank, sludge dewatering equipment, and the connection mode of the equipment refers to FIG. 1. The coking wastewater treatment outlet wastewater is lifted by a pump to enter a regulating tank to balance the water quality and the water quantity. The fluorine-containing wastewater enters the device 1 after being regulated by a regulating tank#In the reaction tank, Ca (OH) is passed through2The pot is added with Ca (OH) according to a certain proportion2To 1#In the reaction tank, stirring in a large-scale low-speed high-efficiency stirring device to perform chemical reaction to generate CaF insoluble in water2And (4) precipitating. In 2#Passing CaCl in a reaction tank2Adding CaCl into a tank2Further lowering F-Concentration of. PAM and PAC flocculating agents are added into the flocculation tank through a PAM tank and a PAC tank, so that the sedimentation speed is improved. The wastewater enters a high-density sedimentation tank for rapid mud-water separation after flocculation, and then enters a neutralization tank. In the neutralization tank, sulfuric acid is added into the acid tank to automatically adjust the pH value of the wastewater to 6-9, and then the wastewater is discharged into a sand filter tank, wherein the filter material in the sand filter tank is improved high-purity quartz sand. The wastewater treated by the sand filtration tank enters an advanced defluorination tank for advanced defluorination treatment, and is finally discharged out of a clean water tank. After the treatment of the fluoride removal combination device, the concentration of the fluoride in the effluent is less than or equal to 5 mg/L.
Claims (5)
1. A high concentration fluoride removes composite set in industrial waste water, its characterized in that, it includes: regulating reservoir, 1#Reaction tank, 2#Reaction tank, flocculation tank, sedimentation tank, neutralization tank, sand filtration tank, deep defluorination tank, clean water tank, sludge treatment system, Ca (OH)2Pot, CaCl2The system comprises a tank, a PAC tank, a PAM tank, an acid tank and a regenerant tank, wherein the sludge treatment system comprises a concentration tank and a sludge dewatering machine; the connection mode is an adjusting tank 1#Reaction tank, 2#The reaction tank, the flocculation tank, the sedimentation tank, the neutralization tank, the sand filtration tank, the deep defluorination tank and the clean water tank are connected in sequence through a conveying pipeline, and Ca (OH)2Tank and 1#The reaction tanks are connected with each other, CaCl2Tank and 2#The reaction tank is connected, the PAC tank and the PAM tank are respectively connected with the flocculation tank, the acid tank is connected with the neutralization tank and the flocculation tank, and the regenerant tank is connected with the deep defluorination tank.
2. The combined device for removing the high-concentration fluoride in the industrial wastewater as claimed in claim 1, wherein the wastewater is industrial wastewater of coking, smelting, electroplating, electronics and the like.
3. The combined device for removing high-concentration fluoride in industrial wastewater as claimed in claim 1, wherein the device is characterized by comprising a regulating tank 1#Reaction tank, 2#The reaction tank, the flocculation tank, the sedimentation tank, the neutralization tank, the sand filtration tank, the deep defluorination tank and the clean water tank are connected in sequence through a conveying pipelineAnd a pump for driving the wastewater to flow is arranged on the conveying pipeline.
4. The combined device for removing high-concentration fluoride in industrial wastewater according to claim 1, wherein the sedimentation tank, the concentration tank and the sludge dewatering machine are connected in sequence through a conveying pipeline.
5. The combined device for removing high-concentration fluoride in industrial wastewater as claimed in claim 1, wherein the combined device is characterized by comprising a sedimentation tank, a sand filter tank, a deep defluorination tank, a sludge dewatering machine and a device 1#The reaction tanks are connected.
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| CN202220063571.XU CN216890431U (en) | 2022-01-11 | 2022-01-11 | High-concentration fluoride removing combined device in industrial wastewater |
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| CN202220063571.XU CN216890431U (en) | 2022-01-11 | 2022-01-11 | High-concentration fluoride removing combined device in industrial wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115959750A (en) * | 2022-12-26 | 2023-04-14 | 伊沃环境科技(南京)有限公司 | Efficient polycrystalline silicon waste water defluorination system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115959750A (en) * | 2022-12-26 | 2023-04-14 | 伊沃环境科技(南京)有限公司 | Efficient polycrystalline silicon waste water defluorination system |
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