CN116282435A - Coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and middle-low concentration fluorine by inorganic fluorine removal and turbidity removal agent - Google Patents
Coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and middle-low concentration fluorine by inorganic fluorine removal and turbidity removal agent Download PDFInfo
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- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 239000011737 fluorine Substances 0.000 title claims abstract description 94
- 229910052731 fluorine Inorganic materials 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 41
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 41
- 238000001556 precipitation Methods 0.000 title claims abstract description 28
- 238000005345 coagulation Methods 0.000 title claims abstract description 23
- 230000015271 coagulation Effects 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000004062 sedimentation Methods 0.000 claims abstract description 42
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000701 coagulant Substances 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 230000001590 oxidative effect Effects 0.000 claims abstract description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 7
- 239000012263 liquid product Substances 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000002195 synergetic effect Effects 0.000 claims abstract description 4
- 238000005189 flocculation Methods 0.000 claims description 46
- 230000016615 flocculation Effects 0.000 claims description 46
- 238000002156 mixing Methods 0.000 claims description 38
- 238000001914 filtration Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 21
- 239000000654 additive Substances 0.000 claims description 18
- 230000000996 additive effect Effects 0.000 claims description 7
- BZSXEZOLBIJVQK-UHFFFAOYSA-N 2-methylsulfonylbenzoic acid Chemical compound CS(=O)(=O)C1=CC=CC=C1C(O)=O BZSXEZOLBIJVQK-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000004659 sterilization and disinfection Methods 0.000 claims description 6
- 238000001308 synthesis method Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 230000001112 coagulating effect Effects 0.000 abstract description 17
- 238000011282 treatment Methods 0.000 abstract description 15
- 239000010865 sewage Substances 0.000 abstract description 6
- 230000009977 dual effect Effects 0.000 abstract description 2
- 239000003673 groundwater Substances 0.000 abstract description 2
- 239000010842 industrial wastewater Substances 0.000 abstract description 2
- 239000002352 surface water Substances 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract 1
- 238000006115 defluorination reaction Methods 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 239000012528 membrane Substances 0.000 description 9
- 239000002351 wastewater Substances 0.000 description 8
- 239000006004 Quartz sand Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000000108 ultra-filtration Methods 0.000 description 4
- 206010016818 Fluorosis Diseases 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 208000004042 dental fluorosis Diseases 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 238000009297 electrocoagulation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229920000426 Microplastic Polymers 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229940077441 fluorapatite Drugs 0.000 description 1
- 229910052587 fluorapatite Inorganic materials 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 239000007800 oxidant agent Substances 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
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000037380 skin damage Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- 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
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by an inorganic fluorine removal turbidity remover. The invention is based on the oxidized polysilicate-iron liquid product prepared by the national invention patent 'inorganic oxidizing polymer ferrosilicon coagulant, the preparation process and the application (ZL 20080015784. X)', and the inorganic fluorine and turbidity removing agent is prepared, so that the inorganic coagulant has the functions of coagulating sedimentation and turbidity removal, and the function of adsorbing fluorine by coagulating flocs, and the dual functions of reducing turbidity and fluorine by coagulating synergistic adsorption are achieved. The invention can reduce the fluorine content of raw water with medium and low fluorine concentration to 0.5 mg/L-1 mg/L, and the turbidity can be reduced to meet the requirement of effluent. The invention has strong adaptability to raw water with large water quality change, and can be applied to the fields of treatment of various surface waters with medium-low concentration fluorine, polluted groundwater and industrial wastewater or domestic sewage.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by an inorganic fluorine removal turbidity remover.
Background
Fluorine is a common element widely distributed in the crust, typically in the form of fluoride in minerals such as fluorapatite, cryolite, fluorite and the like are common. The fluoride in water mainly comes from the weathering effect of minerals in natural environment and human factors, and the latter mainly relates to fluorine pollution caused by industry, incineration and the like. Fluorosis has many manifestations such as skin damage, discoloration, cardiovascular disease, fluorosis or disabling fluorosis, etc.
Common defluorination processes include chemical precipitation, coagulation precipitation, adsorption, membrane separation, electrocoagulation and the like. The membrane separation method generally adopts a nanofiltration method or a reverse osmosis method, and has the advantages of good effluent quality, easy control, simple operation and management and the like, but also has the disadvantages of membrane pollution, high concentrated solution treatment, high energy consumption and the like, and is difficult to apply on a large scale. The electrocoagulation method has the advantages of simple equipment, no secondary pollution, good effect and the like, but has the problems of large electrode loss, small water yield and the like, and is difficult to realize industrialization.
At present, the coagulation sedimentation method and the adsorption method are the main technological methods for removing fluorine. The adsorption method has the advantages of convenient operation, low cost, good effect, no secondary pollution basically, wide adsorption materials, convenient operation of the coagulating sedimentation process, simple equipment, good effect, low cost, large water yield and convenient intermittent operation. However, the adsorption method has the problems of high regeneration cost, incapability of simultaneously and effectively removing turbidity, fluorine and the like, and the effect of removing low-concentration fluorine in a simple coagulating sedimentation method is not very satisfactory, so that the fluorine concentration is difficult to be reduced to below 1 mg/L. But the turbidity removing effect is excellent. Therefore, if the adsorption method is adopted in the coagulating sedimentation method, the adsorption method and the coagulating sedimentation method are organically combined, and the method is an effective method for simultaneously removing turbidity and medium-low concentration fluorine.
The present patent application related to defluorination by coagulating sedimentation is exemplified as follows.
The invention provides an aluminum salt coagulation microfiltration combined defluorination method (CN 200510013656.8), which is characterized in that an aluminum salt coagulation microfiltration combined method is adopted to remove fluoride in drinking water, an aluminum salt coagulant and an alkali solution are added into a coagulation reactor, a certain turbulence is provided in the modes of aeration or stirring and the like, so that aluminum salt is hydrolyzed and coagulated, then enters a membrane separator to continuously react with fluoride in raw water and form floccules, and the purpose of defluorination is achieved through separation of a hollow fiber membrane.
The invention relates to a composite coagulating sedimentation agent (CN 201610342941.2) for removing fluorine and arsenic, which consists of polyacrylamide, chitosan and ferric salt.
A defluorination flocculation reaction method (CN 201610492278.4) of fluorine-containing wastewater adopts a three-stage precipitation reaction tank to carry out precipitation reaction on the fluorine-containing wastewater, wherein the pH value of the wastewater is regulated in each stage of precipitation reaction, a precipitant is added into the wastewater, the precipitant and a flocculating agent are added into the wastewater after the three-stage precipitation reaction to carry out flocculation treatment, and finally, the wastewater after the flocculation reaction is precipitated, and supernatant fluid is discharged.
The invention relates to a precipitation adsorption depth defluorination process (CN 202011353076.4) for a fluorine-containing water body, which adopts resin to adsorb the fluorine-containing water body subjected to certain pretreatment, can effectively avoid the great problems caused by precipitation defluorination or chemical defluorination, has the characteristics of safety, high efficiency, simple operation, convenient planning and application, and the like, and has simple process flow, low treatment cost and good economic benefit.
The invention relates to a materialized coagulation defluorination precipitation integrated wastewater treatment device (CN 201921937808.7), which comprises a homogenizing zone, a coagulation reaction zone, a defluorination reaction zone and a precipitation separation zone which are sequentially connected, wherein the homogenizing zone is an open pond, the homogenizing zone comprises a sewage inlet, the sewage inlet is arranged at the top of one side of the homogenizing zone far away from the coagulation reaction zone, wastewater enters the homogenizing zone from the sewage inlet, and then flows to the coagulation reaction zone, the defluorination reaction zone and the precipitation separation zone sequentially from the homogenizing zone.
The invention relates to integrated equipment (CN 202123199633.4) for efficiently removing fluorine from low-concentration fluorine-containing wastewater, which comprises a pre-treatment part and a post-treatment part which are mutually communicated through connecting pipes, wherein the pre-treatment part comprises a coagulation reaction tank, a loading reaction tank and a flocculation reaction tank which are sequentially communicated, the post-treatment part comprises a sedimentation tank, the flocculation reaction tank is communicated with the sedimentation tank through the connecting pipes, and the integrated equipment further comprises a magnetic powder recovery system and a sludge reflux system, and the magnetic powder recovery system and the sludge reflux system are connected between the bottom of the sedimentation tank and the loading reaction tank.
The invention relates to a fluorine removal device (CN 200720097398.0) combining original ecological aluminum hydroxide and an ultrafiltration membrane, wherein a source water pipeline is communicated with an acid-base tank of an acid-base pH adjusting device, a pH value probe stretches into the source water pipeline, an output pipeline of the acid-base pH adjusting device is connected with an aluminum salt tank and then is connected with an inlet of a coagulating sedimentation tank, a stirrer is arranged at the top of a coagulating part of the coagulating sedimentation tank, an inclined tube is arranged above a common sedimentation part, the output end of the coagulating sedimentation tank is connected with an ultrafiltration membrane component, water is output by the ultrafiltration membrane component, and the ultrafiltration membrane filtering device is connected with a concentrated water return pipeline of the coagulating sedimentation device.
The technology basically adopts methods such as process combination or parameter adjustment to remove fluorine, or adopts an inorganic fluorine-removing turbidity-removing agent which is different from the inorganic fluorine-removing turbidity-removing agent for synchronously reducing turbidity and medium-low concentration fluorine to remove fluorine and other pollutants, and a coagulation cooperative adsorption precipitation method capable of synchronously removing the turbidity and the medium-low concentration fluorine is not seen. At present, no relevant report of a coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and middle-low concentration fluorine is found in domestic and foreign literature databases.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a coagulation synergistic adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by adopting an inorganic fluorine removal turbidity remover, wherein the inorganic fluorine removal turbidity remover takes oxidized polysilica iron and polyaluminum as main raw materials, has high oxidizing property, strong flocculation capability and high chargeability, has higher pollutant removal efficiency of turbidity, fluorine, algae and the like, has high generation and growth speed of flocs, has good precipitation effect, and has excellent adsorption performance.
The inorganic fluorine and turbidity removing agent plays the functions of coagulating sedimentation and turbidity removal of inorganic oxidized polysilicate-iron and the function of coagulating floc to adsorb fluorine, so that the dual functions of reducing turbidity and fluorine by coagulating synergistic adsorption are achieved, the use of the adsorbent is reduced, the subsequent sludge yield is reduced, and the treatment cost of the sludge is further reduced.
In order to achieve the aim, the invention provides an inorganic fluorine and turbidity removing agent which consists of oxidized polysilicate, polyaluminum and additives, wherein the mass percentages of the components are 40-70%, 29-59% and 0.5-3%;
the invention also provides a synthesis method of the inorganic fluorine and turbidity removing agent, which comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the oxidized polysilicate is a liquid product prepared by the national invention patent 'inorganic oxidizing high molecular ferrosilicon coagulant, and a preparation process and application (ZL 20080015784. X)';
the polyaluminium chloride is a commercial industrial grade product;
the additive is industrial sodium chlorate;
the invention also provides a coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by the inorganic fluorine removal turbidity remover, which comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine-removing turbidity-removing agent is added into a rapid stirring and mixing system by adopting a dosing pump, the inorganic fluorine-removing turbidity-removing agent and the raw water are rapidly mixed, the mixing speed is controlled to be 250-450 rpm, and the effective mixing time is controlled to be 60-120 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the rapid mixing system enters a slow flocculation cooperative adsorption system, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 0.5-6 hours;
c. sedimentation system
The effluent of the slow flocculation cooperative adsorption system enters a precipitation system, and the precipitation time is controlled to be 15-120 minutes;
d. filtration system
The effluent of the sedimentation system enters a filtering system, the effective grain diameter of the filtering material of the filtering pool is controlled to be 1-3 mm, and the effluent enters a disinfection system.
The rapid mixing system of the inorganic fluorine-removing and turbidity-removing agent and the water is a mixing tank with a mechanical stirring device and a static pipeline mixer with rapid mixing of the inorganic fluorine-removing and turbidity-removing agent and the water;
the slow flocculation cooperative adsorption system is a hydraulic flocculation tank and a mechanical flocculation tank, wherein the hydraulic flocculation tank comprises a grid flocculation tank, a folded plate flocculation tank and a rotational flow flocculation tank;
the sedimentation system is a horizontal sedimentation tank and a radial sedimentation tank;
the filter tanks are a common rapid filter tank, a V-shaped filter tank, a valveless filter tank, a siphon filter tank, a V-shaped filter tank and a pressure filter tank;
the filter material is quartz sand, anthracite, active carbon, alumina, tao Tuli, plastic beads and magnetite.
The invention has the advantages that:
1. the invention can reduce the fluorine content of raw water with medium and low fluorine concentration to 0.5 mg/L-1 mg/L, and the turbidity can be reduced to meet the requirement of effluent.
2. The oxidized polysilicate-iron coagulant adopted by the invention takes sodium silicate, ferrous sulfate heptahydrate and oxidant as main raw materials, has high oxidability, strong flocculation capacity and high chargeability, has high turbidity, chromaticity, high removal efficiency of pollutants such as heavy metals, algae, microplastic and the like, has high flocculation generation and growth speed and good sedimentation performance, can reduce the volumes of flocculation tanks and sedimentation tanks, and reduces equipment cost and capital cost.
3. The invention can utilize the existing facilities of water supply plants or sewage plants, and has the advantages of simple process, low capital construction cost and low operation cost.
4. The invention has strong adaptability to raw water with large water quality change, and can be applied to the fields of treatment of various surface waters with medium-low concentration fluorine, polluted groundwater and industrial wastewater or domestic sewage.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The inorganic defluorination turbidity remover consists of oxidized polysilicate, polyaluminum and additives, wherein the mass percentages of the components are 51%, 50% and 0.5%;
the synthesis method of the inorganic defluorination turbidity remover comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the oxidized polysilicate is a liquid product prepared by the national invention patent 'inorganic oxidizing high molecular ferrosilicon coagulant, and a preparation process and application (ZL 20080015784. X)';
the polyaluminium chloride is a commercial industrial grade product;
the additive is industrial sodium chlorate;
the method for synchronously reducing turbidity and middle-low concentration fluorine by using the inorganic fluorine removal turbidity remover in the embodiment comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine-removing turbidity-removing agent is added into a static pipeline mixer with a coagulant and water which are rapidly mixed, rapid mixing of the inorganic fluorine-removing turbidity-removing agent and the raw water is carried out, the mixing speed is controlled to be 250-350 r/min, and the effective mixing time is controlled to be 90-120 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the static pipeline mixer enters a grid flocculation tank, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 0.5-3 hours;
c. sedimentation system
The effluent of the grid flocculation tank enters a horizontal sedimentation tank, and the sedimentation time is controlled to be 30-60 minutes;
d. filtration system
The effluent of the horizontal sedimentation tank enters a two-stage filtering system comprising a primary V-shaped filtering tank and a secondary valveless filtering tank, the effective grain diameter of quartz sand of the primary V-shaped filtering tank is controlled to be 1.8-3 mm, the effective grain diameter of anthracite of the secondary valveless filtering tank is controlled to be 1-1.5 mm, and the effluent enters a disinfection system.
Example 2
The inorganic defluorination turbidity remover consists of oxidized polysilicate, polyaluminum and additives, wherein the mass percentages of the components are 51%, 50% and 0.5%;
the synthesis method of the inorganic fluorine and turbidity removing agent comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the oxidized polysilicate is a liquid product prepared by the national invention patent 'inorganic oxidizing high molecular ferrosilicon coagulant, and a preparation process and application (ZL 20080015784. X)';
the polyaluminium chloride is a commercial industrial grade product;
the additive is industrial sodium chlorate;
the method for synchronously reducing turbidity and middle-low concentration fluorine by using the inorganic fluorine removal turbidity remover in the embodiment comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine and turbidity removing agent is added into a mixing tank with a mechanical stirring device by adopting a dosing pump, the inorganic fluorine and turbidity removing agent and the raw water are rapidly mixed, the mixing speed is controlled to be 300-450 rpm, and the effective mixing time is controlled to be 60-90 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the mixing tank enters a mechanical flocculation tank, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 3-6 hours;
c. sedimentation system
The effluent of the mechanical flocculation tank enters a horizontal sedimentation tank, and the sedimentation time is controlled to be 15-30 minutes;
d. filtration system
The effluent of the horizontal sedimentation tank enters a V-shaped filter tank, the effective grain diameter of quartz sand of the V-shaped filter tank is controlled to be 1-3 mm, and the effluent enters a disinfection system.
Example 3
The inorganic defluorination turbidity remover consists of oxidized polysilicate, polyaluminum and additives, wherein the mass percentages of the components are 41%, 59% and 2.5%;
the synthesis method of the inorganic fluorine and turbidity removing agent comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the oxidized polysilicate is a liquid product prepared by the national invention patent 'inorganic oxidizing high molecular ferrosilicon coagulant, and a preparation process and application (ZL 20080015784. X)';
the polyaluminium chloride is a commercial industrial grade product;
the additive is industrial sodium chlorate;
the method for synchronously reducing turbidity and middle-low concentration fluorine by using the inorganic fluorine removal turbidity remover in the embodiment comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine and turbidity removing agent is added into a mixing tank with a mechanical stirring device by adopting a dosing pump, the inorganic fluorine and turbidity removing agent and the raw water are rapidly mixed, the mixing speed is controlled to be 300-450 rpm, and the effective mixing time is controlled to be 90-120 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the mixing tank enters a mechanical flocculation tank, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 0.5-3 hours;
c. sedimentation system
The effluent of the mechanical flocculation tank enters a horizontal sedimentation tank, and the sedimentation time is controlled to be 90-120 minutes;
d. filtration system
The effluent of the horizontal flow sedimentation tank enters a two-stage filtering system comprising a primary V-shaped filter tank and a secondary V-shaped filter tank, the effective grain diameter of quartz sand of the primary V-shaped filter tank is controlled to be 1.8-3 mm, the effective grain diameter of quartz sand of the secondary V-shaped filter tank is controlled to be 1-1.5 mm, and the effluent enters a disinfection system.
Example 4
The inorganic defluorination turbidity remover consists of oxidized polysilicate, polyaluminum and additives, wherein the mass percentages of the components are 41%, 59% and 2.5%;
the synthesis method of the inorganic fluorine and turbidity removing agent comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the oxidized polysilicate is a liquid product prepared by the national invention patent 'inorganic oxidizing high molecular ferrosilicon coagulant, and a preparation process and application (ZL 20080015784. X)';
the polyaluminium chloride is a commercial industrial grade product;
the additive is industrial sodium chlorate;
the method for synchronously reducing turbidity and middle-low concentration fluorine by using the inorganic fluorine removal turbidity remover in the embodiment comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine-removing turbidity-removing agent is added into a static pipeline mixer with a coagulant and water which are rapidly mixed, rapid mixing of the inorganic fluorine-removing turbidity-removing agent and the raw water is carried out, the mixing speed is controlled to be 250-350 r/min, and the effective mixing time is controlled to be 60-90 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the mixing tank enters a mechanical flocculation tank, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 3-6 hours;
c. sedimentation system
The effluent of the mechanical flocculation tank enters a horizontal sedimentation tank, and the sedimentation time is controlled to be 90-120 minutes;
d. filtration system
The effluent of the horizontal sedimentation tank enters a V-shaped filter tank, the effective grain diameter of quartz sand of the V-shaped filter tank is controlled to be 1-3 mm, and the effluent enters a disinfection system.
Application example 1
The results of the treatments for the low-concentration fluorine-containing water in examples 1 and 3 are shown in Table 1. The water quality of the simulated low-concentration fluorine-containing water is as follows: turbidity is 10.5-15.2 NTU, chromaticity is 0.052-0.056A, fluorine concentration is 1.68-2.14 mg/L, pH=7.9-8.2, and temperature=15-15.5 ℃.
TABLE 1 Effect of inventive examples 1, 3 treatment to simulate Low concentration fluorine-containing Water
After the water passes through the filtering system, the turbidity of the water sample can be reduced to the degree of meeting the water outlet requirement; the fluorine concentration can be directly reduced to below 1 mg/L through the technical scheme of the invention; therefore, from the above treatment results, the present invention is excellent in both turbidity and removal effect of fluorine at a low concentration.
Application example 2
The results of the treatments of the fluorine-containing water having medium concentration in examples 2 and 4 are shown in Table 2. The water quality of the concentration fluorine-containing water in the simulation is as follows: turbidity of 11-18 NTU, chromaticity of 0.038-0.045A, fluorine concentration of 9.98-11.4 mg/L, pH=8.1-8.3, and temperature=17-22 ℃.
TABLE 2 Effect of the treatment of fluorine-containing Water at concentration in the simulation of examples 3 and 4 of the present invention
After the water passes through the filtering system, the turbidity of the water sample can be reduced to the degree of meeting the water outlet requirement; the fluorine concentration can be directly reduced to below 1 mg/L through the technical scheme of the invention; therefore, from the above treatment results, the present invention was found to be excellent in both turbidity and removal effect of fluorine at a medium concentration.
Claims (4)
1. The coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by using the inorganic fluorine removal turbidity-removing agent is characterized by comprising 40-70% by mass of oxidized polysilicate, 29-59% by mass of polymerized aluminum and 0.5-3% by mass of additive;
the synthesis method of the inorganic fluorine and turbidity removing agent comprises the following steps:
simultaneously mixing oxidized polysilicate iron, polyaluminum oxide and additives under the stirring condition of stirring speed of 100-200 rpm and at room temperature, and stirring for 10-20 minutes to prepare a tan liquid inorganic fluorine and turbidity removing agent;
the coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and middle-low concentration fluorine by the inorganic fluorine removal and turbidity removal agent comprises the following specific processes:
a. rapid mixing system of inorganic fluorine-removing turbidity-removing agent and water
According to the water inflow and quality of raw water, an inorganic fluorine-removing turbidity-removing agent is added into a rapid stirring and mixing system by adopting a dosing pump, the inorganic fluorine-removing turbidity-removing agent and the raw water are rapidly mixed, the mixing speed is controlled to be 250-450 rpm, and the effective mixing time is controlled to be 60-120 seconds;
b. low-speed flocculation cooperative adsorption system
The effluent of the rapid mixing system enters a slow flocculation cooperative adsorption system, the flocculation speed is controlled to be 100-150 rpm, and the flocculation adsorption time is controlled to be 0.5-6 hours;
c. sedimentation system
The effluent of the slow flocculation cooperative adsorption system enters a precipitation system, and the precipitation time is controlled to be 15-120 minutes;
d. filtration system
The effluent of the sedimentation system enters a filtering system, the effective grain diameter of the filtering material of the filtering pool is controlled to be 1-3 mm, and the effluent enters a disinfection system.
2. The coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and medium-low concentration fluorine by using the inorganic fluorine removal turbidity remover according to claim 1, wherein the oxidized polysilicate is a liquid product prepared by a national invention patent of inorganic oxidizing high molecular ferrosilicon coagulant, a preparation process and application (ZL 20080015784. X).
3. The method for simultaneous turbidity reduction and low-medium concentration fluorine coagulation synergistic adsorption precipitation by using an inorganic fluorine removal turbidity remover according to claim 1, wherein the additive is industrial sodium chlorate.
4. The coagulation cooperative adsorption precipitation method for synchronously reducing turbidity and middle-low concentration fluorine by using the inorganic fluorine removal turbidity remover according to claim 1, wherein the fluorine content of raw water with middle-low concentration fluorine can be reduced to 0.5-mg/L to 1-mg/L, and the turbidity can be reduced to meet the requirement of effluent.
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