CN103588272A - Preparation method for inorganic flocculating agent and enhanced coagulation method for treating low-temperature low-turbidity high-organic matter water body by using inorganic flocculating agent - Google Patents
Preparation method for inorganic flocculating agent and enhanced coagulation method for treating low-temperature low-turbidity high-organic matter water body by using inorganic flocculating agent Download PDFInfo
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- CN103588272A CN103588272A CN201310626798.6A CN201310626798A CN103588272A CN 103588272 A CN103588272 A CN 103588272A CN 201310626798 A CN201310626798 A CN 201310626798A CN 103588272 A CN103588272 A CN 103588272A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 239000008394 flocculating agent Substances 0.000 title claims abstract description 69
- 230000015271 coagulation Effects 0.000 title claims abstract description 57
- 238000005345 coagulation Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 239000005416 organic matter Substances 0.000 title abstract description 7
- 239000000243 solution Substances 0.000 claims abstract description 35
- 239000012266 salt solution Substances 0.000 claims abstract description 34
- 239000000701 coagulant Substances 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 25
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000003513 alkali Substances 0.000 claims abstract description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 13
- 229910021645 metal ion Inorganic materials 0.000 claims description 12
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 9
- 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 claims description 9
- 239000012267 brine Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 6
- 150000002505 iron Chemical class 0.000 claims description 6
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 5
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 5
- 159000000013 aluminium salts Chemical class 0.000 claims description 4
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 3
- MVFCKEFYUDZOCX-UHFFFAOYSA-N iron(2+);dinitrate Chemical compound [Fe+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MVFCKEFYUDZOCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000001103 potassium chloride Substances 0.000 claims description 3
- 235000011164 potassium chloride Nutrition 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 6
- 239000010865 sewage Substances 0.000 abstract description 5
- 239000008399 tap water Substances 0.000 abstract description 4
- 235000020679 tap water Nutrition 0.000 abstract description 4
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract 2
- 239000010842 industrial wastewater Substances 0.000 abstract 1
- 231100000956 nontoxicity Toxicity 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 20
- 238000005189 flocculation Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 8
- 230000016615 flocculation Effects 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 5
- 229920002401 polyacrylamide Polymers 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000001112 coagulating effect Effects 0.000 description 4
- 239000002957 persistent organic pollutant Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 3
- 231100000252 nontoxic Toxicity 0.000 description 3
- 230000003000 nontoxic effect Effects 0.000 description 3
- 238000000247 postprecipitation Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229920001661 Chitosan Polymers 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
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- 150000001875 compounds Chemical class 0.000 description 1
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- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
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Abstract
The invention relates to a preparation method for a novel inorganic flocculating agent and an enhanced coagulation method for treating a low-temperature low-turbidity high-organic matter water body by using the inorganic flocculating agent. The objective of the invention is to overcome the problems that conventional coagulants and coagulation processes do not simultaneously have the advantages of high efficiency, low cost, no toxicity and simple preparation process in treatment of one or a plurality of composite difficult-to-treat water bodies with low temperature, low turbidity and high content of organic matters. The preparation method provided by the invention comprises the following steps: uniformly dispersing a water glass solution with a certain concentration into a metal salt solution with a certain concentration and carrying out stirring and curing so as to obtain the inorganic flocculating agent. The enhanced coagulation method comprises the following steps: adding a traditional coagulant in the stage of mixing during water treatment process; then adding the inorganic flocculating agent after a mixed reaction; adding alkali lye into a water pipeline located between a sedimentation tank and a water conveying pump station or into the body of the sedimentation tank; and adjusting a pH value. The inorganic flocculating agent and the enhanced coagulation method are applicable to treatment of tap water, domestic sewage and industrial waste water.
Description
Technical field
The invention belongs to water treatment field, be specifically related to a kind of preparation method of novel flocculation agent and utilize it to process the enhanced coagulation method of the high organism water body of low-temperature and low turbidity.
Background technology
The coagulating treatment of low temperature, low turbid, high organism and the high chroma water body that caused by the natural organic matter of high-content is the difficulties of water treatment field always, is also one of problem in the urgent need to address.Especially the area that some are high and cold, Forestland and grassland rate is high and be subject to industrial heavily contaminated, while utilizing these regional earth surface water sources as tap water water source, tends to occur above-mentioned these difficulties.At present, the water technology overwhelming majority of waterworks is coagulation-precipitation-filtration-sterilization conventional water treatment process, and s-generation ozone and activated carbon technique and the third generation be take the coupling technique that film is core and also all usingd common process as pre-treatment.Therefore, coagulation effect has directly determined processing load and the whole water technology treatment effect of subsequent technique, is the key link in water treatment process.
Low-temperature and low turbidity has significant impact to coagulation effect.When water temperature is too low, flocs unit forms slowly, and flocculation particle is tiny, and coagulation effect is poor, mainly contains the problem of several aspects: (1) inorganic coagulant hydrolysis reaction is thermo-negative reaction, and when water temperature is low, coagulating agent hydrolysis slowly; (2) when water temperature is low, it is large that the viscosity of water becomes, and the resistance of colloidal solid motion increases, and affects effective collision and flocculation between colloid; (3) when water temperature is low, the pedesis of the colloidal solid in water weakens, and is unfavorable for taking off the incorgruous flocculation of steady colloidal solid.When turbidity particle concentration is too low, the probability of collision between particle reduces greatly, coagulation effect variation.If raw water turbidity is low and water temperature is low, be commonly referred to " low temperature and low turbidity water ", coagulating treatment difficulty is larger.
Organic pollutant in water is also an important aspect on the impact of coagulation effect; organic pollutant in drinking water source has protection stabilization to colloid; be that in water, deliquescent organic molecule is adsorbed on colloidal solid thing surface as having formed one deck organic coating; colloidal solid is protected; hinder the collision between colloidal solid; hindered the de-steady agglutination between coagulating agent and colloidal solid;, without organic water body, the throwing amount that need to increase coagulating agent could obtain good coagulation effect.
Coagulating agent of a great variety, but the most frequently used coagulating agent is polymerize aluminum chloride (PAC) at present, but the difficult water body for one or more combinations such as low temperature, low turbid, high organism, simple just seems helpless by polymerize aluminum chloride, even if only depend on the enhanced coagulation method of increase consuming amount of concrete, is also impracticable.Common solution has: prechlorination, Potassium Permanganate Preoxidation, Composite Potassium Permanganate preoxidation, biological pre-oxidation and add the pre-treatment such as Powdered Activated Carbon strengthening; Use coagulant aids; Improve coagulation hydraulics etc.Wherein preprocessing means, mainly in high Organic pollutants water body, really can play good effect, but preoxidation need to increase certain initial cost to some water quality water body, increases adding equipment etc.Use coagulant aids mainly for low-temperature and low turbidity water body, conventional coagulant aids has activated silicic acid, polyacrylamide (PAM) and the various inorganic polymer flocculants such as polysilicate coagulant newly developed, the organic polymer coargulators such as chitosan, biological flocculant.Activated silicic acid has good effect to low-temperature and low turbidity water body, and the 80s and 90s is in water factory's practical application, but exist, needs to use the aggressive chemistry medicaments such as sulfuric acid and the bad control of polyreaction in activated silicic acid layoutprocedure; Polyacrylamide (PAM) also has use in waterworks, but PAM monomer is poisonous, ban use of at present, polysilicate coagulant also rests on laboratory stage at present substantially, large-scale commercial is produced certain problem that also exists, liquid coagulating agent transportation is trouble, and solid-state coagulating agent actual effect can be had a greatly reduced quality; Organic polymer coargulator is expensive.
For Organic pollutants water body, especially contain the enhanced coagulation technology of a large amount of soil ulmin, current current research conclusion is that under acidic conditions, soil ulmin has higher coagulation removal effect.Therefore abroad in order to realize, to increase carbonic acid gas before this purpose ， water factory treatment process coagulation stage and add, the efficient removal of the pH value realization that reduces source water to soil ulmin.But the method high cost of this reduction pH value, is not suitable for large-scale redevelopment and popularization.By directly adding sulfuric acid and hydrochloric acid regulates, also there is the problem of a bit, if pH can not control preferably, can affect on the contrary the flocculating effect of conventional coagulating agent, thereby uncommon in actual applications.
Summary of the invention
The present invention will solve existingly for the treatment of low temperature, low turbid and possess efficient, cheap, nontoxic and preparation process simple question when high organism is a kind of and the conventional coagulating agent of multiple compound difficult water body and coagulation process are different, and a kind of preparation method of inorganic flocculating agent is provided and utilizes the enhanced coagulation method of the high organism water body of its processing low-temperature and low turbidity.
The preparation method of a kind of inorganic flocculating agent of the present invention, carries out according to the following steps:
Water glass solution is dispersed in metal salt solution, stirs after slaking, obtain inorganic flocculating agent; Wherein said water glass solution is natrium brine glass solution or sylvite water glass solution; Described metal salt solution is iron salt solutions, aluminum salt solution or molysite aluminium mixed salt solution, and the molysite in described iron salt solutions is iron(ic) chloride, ferric sulfate or iron nitrate, and the aluminium salt in described aluminum salt solution is aluminum chloride, Tai-Ace S 150 or aluminum nitrate.
Utilize above-mentioned inorganic flocculating agent to process the enhanced coagulation method of the high organism water body of low-temperature and low turbidity, carry out according to the following steps:
Mix stages at water treatment technological process first adds traditional coagulating agent, after hybrid reaction 1min～10min, add again inorganic flocculating agent, then the water pipe between settling tank and conveying pump station or the Chi Tizhong of settling tank add alkali lye, regulating pH value is 6.5～8.5, and the enhanced coagulation that completes the high organism water body of low-temperature and low turbidity is processed; The dosage of described traditional coagulating agent is 5mg/L～80mg/L; The dosage of described inorganic flocculating agent is for processing 0.005%～0.1% of the water yield.
The present invention can be used for the coagulating treatment to low temperature, low turbid or high organism water body, sanitary sewage and trade effluent, compares with traditional coagulating agent and coagulation method, has following obvious advantage:
One, inorganic flocculating agent and the enhanced coagulation method of utilizing the present invention to prepare, can carry out highly effective coagulation processing to low temperature, low turbid or high organism water body, especially to organic clearance, can improve 5%～20%, in addition, the water bodys such as the higher sanitary sewage of organic matter, trade effluent are had to stronger adaptive faculty;
Two, can reduce the throwing amount of traditional coagulating agent of 20%～50%, in coagulation process, floc particle size is large, closely knit, can in post precipitation pond, precipitate rapidly, alleviated because of the not good pressure to filter tank of coagulation effect, reduced back flushing number of times, and, the effect of flocculation agent and enhanced coagulation is not subject to the impact of low temperature, low turbid and technique pH value condition substantially, better to the adaptability of water technology;
Three, the inorganic flocculating agent that prepared by the present invention is nontoxic, and preparation process is simple;
Four, the present invention is easy to get for the preparation of the raw material of inorganic flocculating agent, and cheap, has reduced the preparation cost of inorganic flocculating agent.
Accompanying drawing explanation
Fig. 1 is test one inorganic flocculating agent preparation technology schematic diagram;
Fig. 2 is for utilizing the inorganic flocculating agent of test one preparation to process the enhanced coagulation process schematic representation of the high organism water body of low-temperature and low turbidity.
Embodiment
Embodiment is only optimal way of the present invention, and the present invention is not limited to this.
Embodiment one: the preparation method of a kind of inorganic flocculating agent of present embodiment, carries out according to the following steps:
Water glass solution is dispersed in metal salt solution, stirs after slaking, obtain inorganic flocculating agent; Wherein said water glass solution is natrium brine glass solution or sylvite water glass solution; Described metal salt solution is iron salt solutions, aluminum salt solution or molysite aluminium mixed salt solution, and the molysite in described iron salt solutions is iron(ic) chloride, ferric sulfate or iron nitrate, and the aluminium salt in described aluminum salt solution is aluminum chloride, Tai-Ace S 150 or aluminum nitrate.
When the metal salt solution described in present embodiment is molysite aluminium mixed salt solution, molysite and aluminium salt are mixed by any ratio.
Inorganic flocculating agent prepared by present embodiment is nontoxic, and preparation process is simple.
Present embodiment is easy to get for the preparation of the raw material of inorganic flocculating agent, and cheap, has reduced the preparation cost of inorganic flocculating agent.
Inorganic flocculating agent prepared by present embodiment can be used for the coagulating treatment to low temperature, low turbid or high organism water body, sanitary sewage and trade effluent, the factor that low temperature, low turbid, high organism etc. is affected to coagulation effect has higher adaptive faculty, in coagulation process, floc particle size is large, closely knit, can in post precipitation pond, precipitate rapidly, alleviated because of the not good pressure to filter tank of coagulation effect, reduced back flushing number of times.
It is few that inorganic flocculating agent prepared by present embodiment has throwing amount, good to turbidity and organic removal effect, particularly flocculation agent preparation method is simple, being applicable to water factory does between to dosing under the condition of a small amount of transformation and can prepare, to production technology and operant level, require low, the reagent cost adopting is low, can be widely used in water treatment field.
Embodiment two: present embodiment is different from embodiment one: by SiO
2the mass concentration water glass solution that is 0.25%～28% be dispersed in the metal salt solution that the mass concentration of metal ion is 0.1%～5.0%, stir after slaking, obtain inorganic flocculating agent; Wherein said SiO
2the mass concentration water glass solution that is 0.25%～28% in SiO
2with the mol ratio of metal ion in the mass concentration of the metal ion metal salt solution that is 0.1%～5.0% be (0.1～5): 1.Other is identical with embodiment one.
Embodiment three: present embodiment is different from embodiment two: by SiO
2the mass concentration water glass solution that is 0.5%～5% be dispersed in the metal salt solution that the mass concentration of metal ion is 0.5%～3.5%, stir after slaking, obtain inorganic flocculating agent; Wherein said SiO
2the mass concentration water glass solution that is 0.5%～5% in SiO
2with the mol ratio of metal ion in the mass concentration of the metal ion metal salt solution that is 0.5%～3.5% be (0.1～2): 1.Other is identical with embodiment one or two.
Embodiment four: present embodiment is different from one of embodiment one to three: the method that water glass solution is dispersed in to metal salt solution is that rapid stirring mixes, static mixer mixes, jet mixer mixes or impinging streams mixer mixes.Other is identical with one of embodiment one to three.
Embodiment five: present embodiment is different from one of embodiment one to four: the preparation method of inorganic flocculating agent, carries out: according to the following steps by SiO
2mass concentration be 1.4% natrium brine glass solution is dispersed in the mixing solutions of iron(ic) chloride and Tai-Ace S 150, stir slaking 2h, obtain inorganic flocculating agent; Wherein said SiO
2the mass concentration natrium brine glass solution that is 1.4% in SiO
2with Fe in the mixing solutions of iron(ic) chloride and Tai-Ace S 150
3+mol ratio be 1:1; Described SiO
2the mass concentration natrium brine glass solution that is 1.4% in SiO
2with Al in the mixing solutions of iron(ic) chloride and Tai-Ace S 150
3+mol ratio be 1:1.Other is identical with one of embodiment one to four.
The inorganic flocculating agent stability making by the preparation method of present embodiment is better, there is good Coagulation aiding, and traditional coagulating agent is used in conjunction with, turbidity is especially had to higher clearance to natural organic matter, the flco producing after coagulation is large and closely knit, not affected by low-temperature and low turbidity.
Embodiment six: present embodiment is different from one of embodiment one to five: the curing time is 30min～24h.Other is identical with one of embodiment one to five.
Embodiment seven: utilize inorganic flocculating agent prepared by one of embodiment one to six either type to process the enhanced coagulation method of the high organism water body of low-temperature and low turbidity, carry out according to the following steps:
Mix stages at water treatment technological process first adds traditional coagulating agent, after hybrid reaction 1min～10min, add again inorganic flocculating agent, then the water pipe between settling tank and conveying pump station or the Chi Tizhong of settling tank add alkali lye, regulating pH value is 6.5～8.5, and the enhanced coagulation that completes the high organism water body of low-temperature and low turbidity is processed; The dosage of described traditional coagulating agent is 5mg/L～80mg/L; The dosage of described inorganic flocculating agent is for processing 0.005%～0.1% of the water yield.
Utilize the enhanced coagulation method of present embodiment, can carry out highly effective coagulation processing to low temperature, low turbid or high organism water body, especially organic clearance is improved to 5%～20%, in addition, the water bodys such as the higher sanitary sewage of organic matter, trade effluent are had to stronger adaptive faculty.
The enhanced coagulation method of present embodiment, can reduce the throwing amount of traditional coagulating agent of 20%～50%, in coagulation process, floc particle size is large, closely knit, can in post precipitation pond, precipitate rapidly, alleviated because of the not good pressure to filter tank of coagulation effect, reduced back flushing number of times, and the effect of flocculation agent and enhanced coagulation is not subject to the impact of low temperature, low turbid and technique pH value condition substantially, better to the adaptability of water technology.
Embodiment eight: present embodiment is different from embodiment seven: described traditional coagulating agent is Tai-Ace S 150, iron trichloride, polymerize aluminum chloride, bodied ferric sulfate, aluminium iron polychloride or polymer phosphate aluminium.Other is identical with embodiment seven.
Embodiment nine: present embodiment is different from embodiment seven or eight: the dosage of described inorganic flocculating agent is for processing 0.01%～0.05% of the water yield.Other is identical with embodiment seven or eight.
Embodiment ten: present embodiment is different from one of embodiment seven to nine: utilize inorganic flocculating agent prepared by one of embodiment one to six either type to process the enhanced coagulation method of the high organism water body of low-temperature and low turbidity, carry out according to the following steps: the mix stages at water treatment technological process first adds polymerize aluminum chloride, after hybrid reaction 5min, add again inorganic flocculating agent, then the water pipe between settling tank and conveying pump station or the Chi Tizhong of settling tank add alkali lye, regulating pH value is 6.5～8.5, the enhanced coagulation that completes the high organism water body of low-temperature and low turbidity is processed, the dosage of described polymerize aluminum chloride is 45mg/L, the dosage of described inorganic flocculating agent is for processing 0.03% of the water yield.Other is identical with one of embodiment seven to nine.
Adopt after enhanced coagulation method of the present invention, polymerize aluminum chloride throwing amount reduces by 25%, the turbidity of output water is reduced to 0.5NTU～1NTU by original 5NTU～70NTU, permanganate indices is reduced to 3mg/L～4mg/L by the 10mg/L～14mg/L of former water, and the flco producing in flocculation process is large and closely knit, reduced the back flushing frequency in filter tank.
Adopt following verification experimental verification effect of the present invention:
Test one: in conjunction with Fig. 1, a kind of preparation method of inorganic flocculating agent, carries out according to the following steps:
The natrium brine glass of certain volume is joined to sodium silicate dissolving tank 5 from water glass conservation tank 1, add tap water to configure certain density natrium brine glass solution, respectively the Tai-Ace S 150 of certain mass, iron(ic) chloride are joined to dissolving tank for aluminum 2, iron(ic) chloride dissolving tank 3, after dissolving, join inorganic flocculating agent Preparation tank 7; Start blower fan 4 and stir inorganic flocculating agent Preparation tank 7 by aeration perforated pipe 8, when stirring, the water glass solution configuring is joined inorganic flocculating agent Preparation tank 7 by perforated pipe 6 lentamente from sodium silicate dissolving tank 5, after the slaking regular hour, obtain inorganic flocculating agent, be that available pump 9 is extracted into inorganic flocculating agent grug feeding jar 10, with dosing volume pump 11, add tap water technique specific position to add a little 12.
In this test, in sodium silicate dissolving tank 5, be SiO
2the mass concentration natrium brine glass solution that is 1.4%; In iron(ic) chloride dissolving tank 3, be Fe
3+the mass concentration ferric chloride Solution that is 1.38%; In dissolving tank for aluminum 2, be Al
3+the mass concentration alum liquor that is 1.26%; And SiO in inorganic flocculating agent Preparation tank 7
2with Fe
3+mol ratio be 1:1, SiO
2with Al
3+mol ratio be 1:1; Curing time is 2h.
The inorganic flocculating agent stability making by this preparation method is better, there is good Coagulation aiding, and traditional coagulating agent is used in conjunction with, turbidity is especially had to higher clearance to natural organic matter, the flco producing after coagulation is large and closely knit, not affected by low-temperature and low turbidity.
Test two: this test is to utilize the inorganic flocculating agent of test one preparation to process the enhanced coagulation method of the high organism water body of low-temperature and low turbidity, carries out according to the following steps:
The inorganic flocculating agent of test one preparation is applied to certain waterworks, it is 30,000 tons/day that total Water is processed in waterworks, enhanced coagulation process schematic representation as shown in Figure 2, water intake pumping station 13 is from certain reservoir water intaking, pass through successively static mixing 14, grid flocculation 15, tube settler 16, conventional rapid filter 17, clean water basin 18, then through conveying pump station 19, be delivered to water supply network; In static mixing 14, add polymerize aluminum chloride 20, after hybrid reaction 5min, add inorganic flocculating agent 21, at the total water outlet of tube settler 16, adding sodium hydroxide solution 22 adjusting pH values is 6.5～8.5, before entering clean water basin 18, add dioxide peroxide 23 and carry out disinfection, the enhanced coagulation that completes the high organism water body of low-temperature and low turbidity is processed.
This waterworks water quality belongs to low temperature especially in the winter time, low turbid, the extremely difficult water body of high soil ulmin, water temperature in winter is minimum can reach 1 ℃～2 ℃, turbidity is 5NTU～70NTU, permanganate indices is 10mg/L～14mg/L, adopt common polymerize aluminum chloride consuming amount of concrete to reach 60mg/L and be also difficult to above obtain good coagulation effect, the tiny precipitation that is difficult to of flco, adopt the present invention to test after the inorganic flocculating agent and enhanced coagulation method of the present invention of a preparation, in this test, polymerize aluminum chloride throwing amount is 45mg/L, liquid inorganic flocculating agent dosage is for processing 0.03% of the water yield.The turbidity of output water is reduced to 0.5NTU～1NTU by original 5NTU～70NTU, and permanganate indices is reduced to 3mg/L～4mg/L by the 10mg/L～14mg/L of former water, and the flco producing in flocculation process is large and closely knit, has reduced the back flushing frequency in filter tank.
Claims (8)
1. a preparation method for inorganic flocculating agent, is characterized in that the preparation method of inorganic flocculating agent carries out according to the following steps:
Water glass solution is dispersed in metal salt solution, stirs after slaking, obtain inorganic flocculating agent; Wherein said water glass solution is natrium brine glass solution or sylvite water glass solution; Described metal salt solution is iron salt solutions, aluminum salt solution or molysite aluminium mixed salt solution, and the molysite in described iron salt solutions is iron(ic) chloride, ferric sulfate or iron nitrate, and the aluminium salt in described aluminum salt solution is aluminum chloride, Tai-Ace S 150 or aluminum nitrate.
2. the preparation method of a kind of inorganic flocculating agent according to claim 1, is characterized in that SiO
2the mass concentration water glass solution that is 0.25%～28% be dispersed in the metal salt solution that the mass concentration of metal ion is 0.1%～5.0%, stir after slaking, obtain inorganic flocculating agent; Wherein said SiO
2the mass concentration water glass solution that is 0.25%～28% in SiO
2with the mol ratio of metal ion in the mass concentration of the metal ion metal salt solution that is 0.1%～5.0% be (0.1～5): 1.
3. the preparation method of a kind of inorganic flocculating agent according to claim 2, is characterized in that SiO
2the mass concentration water glass solution that is 0.5%～5% be dispersed in the metal salt solution that the mass concentration of metal ion is 0.5%～3.5%, stir after slaking, obtain inorganic flocculating agent; Wherein said SiO
2the mass concentration water glass solution that is 0.5%～5% in SiO
2with the mol ratio of metal ion in the mass concentration of the metal ion metal salt solution that is 0.5%～3.5% be (0.1～2): 1.
4. according to the preparation method of a kind of inorganic flocculating agent described in claim 1,2 or 3, the method that it is characterized in that the water glass solution to be dispersed in metal salt solution is that rapid stirring mixes, static mixer mixes, jet mixer mixes or impinging streams mixer mixes.
5. the preparation method of a kind of inorganic flocculating agent according to claim 1, is characterized in that the curing time is 30min～24h.
6. utilize the enhanced coagulation method of the high organism water body of inorganic flocculating agent processing low-temperature and low turbidity as described in claim 1,2,3,4 or 5, it is characterized in that utilizing the enhanced coagulation method of the high organism water body of inorganic flocculating agent processing low-temperature and low turbidity to carry out according to the following steps:
Mix stages at water treatment technological process first adds traditional coagulating agent, after hybrid reaction 1min～10min, add again inorganic flocculating agent, then the water pipe between settling tank and conveying pump station or the Chi Tizhong of settling tank add alkali lye, regulating pH value is 6.5～8.5, and the enhanced coagulation that completes the high organism water body of low-temperature and low turbidity is processed; The dosage of described traditional coagulating agent is 5mg/L～80mg/L; The dosage of described inorganic flocculating agent is for processing 0.005%～0.1% of the water yield.
7. the enhanced coagulation method of utilizing inorganic flocculating agent to process the high organism water body of low-temperature and low turbidity according to claim 6, is characterized in that described traditional coagulating agent is Tai-Ace S 150, iron trichloride, polymerize aluminum chloride, bodied ferric sulfate, aluminium iron polychloride or polymer phosphate aluminium.
8. the enhanced coagulation method of utilizing inorganic flocculating agent to process the high organism water body of low-temperature and low turbidity according to claim 6, is characterized in that the dosage of described inorganic flocculating agent is for processing 0.01%～0.05% of the water yield.
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