CN114516681A - Composite flocculant for industrial wastewater treatment and preparation method thereof - Google Patents
Composite flocculant for industrial wastewater treatment and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 40
- 239000010842 industrial wastewater Substances 0.000 title claims abstract description 34
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 32
- 229920001661 Chitosan Polymers 0.000 claims abstract description 48
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 32
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- 230000016615 flocculation Effects 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 10
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 137
- 239000000243 solution Substances 0.000 claims description 95
- 229920002472 Starch Polymers 0.000 claims description 35
- 239000008107 starch Substances 0.000 claims description 35
- 235000019698 starch Nutrition 0.000 claims description 35
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- 230000003311 flocculating effect Effects 0.000 claims description 29
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 28
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 27
- 239000004115 Sodium Silicate Substances 0.000 claims description 25
- 239000002253 acid Substances 0.000 claims description 25
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 25
- 239000011790 ferrous sulphate Substances 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 25
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 25
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 25
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 25
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- 239000007864 aqueous solution Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 18
- 239000003054 catalyst Substances 0.000 claims description 15
- 239000012153 distilled water Substances 0.000 claims description 15
- 239000003999 initiator Substances 0.000 claims description 15
- 229910021519 iron(III) oxide-hydroxide Inorganic materials 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 15
- 239000003381 stabilizer Substances 0.000 claims description 15
- 239000000725 suspension Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 14
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- NEZSMXUEXWCBQN-UHFFFAOYSA-M phenyl(tripropyl)azanium;chloride Chemical compound [Cl-].CCC[N+](CCC)(CCC)C1=CC=CC=C1 NEZSMXUEXWCBQN-UHFFFAOYSA-M 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000005406 washing Methods 0.000 claims description 11
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- CUPCBVUMRUSXIU-UHFFFAOYSA-N [Fe].OOO Chemical compound [Fe].OOO CUPCBVUMRUSXIU-UHFFFAOYSA-N 0.000 claims description 10
- 238000001994 activation Methods 0.000 claims description 10
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 10
- 239000001569 carbon dioxide Substances 0.000 claims description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 238000004090 dissolution Methods 0.000 claims description 8
- 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 6
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 6
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- 230000003213 activating effect Effects 0.000 claims description 5
- 230000004913 activation Effects 0.000 claims description 5
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 5
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 claims description 5
- 239000007795 chemical reaction product Substances 0.000 claims description 5
- 239000000084 colloidal system Substances 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 5
- 150000002367 halogens Chemical class 0.000 claims description 5
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- -1 iron oxyhydroxide modified montmorillonite Chemical class 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 239000001254 oxidized starch Substances 0.000 claims description 5
- 235000013808 oxidized starch Nutrition 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- 238000006116 polymerization reaction Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- HYHCSLBZRBJJCH-UHFFFAOYSA-M sodium hydrosulfide Chemical compound [Na+].[SH-] HYHCSLBZRBJJCH-UHFFFAOYSA-M 0.000 claims description 5
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 239000012991 xanthate Substances 0.000 claims description 5
- 239000008394 flocculating agent Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000010865 sewage Substances 0.000 abstract description 3
- VTEIFHQUZWABDE-UHFFFAOYSA-N 2-(2,5-dimethoxy-4-methylphenyl)-2-methoxyethanamine Chemical compound COC(CN)C1=CC(OC)=C(C)C=C1OC VTEIFHQUZWABDE-UHFFFAOYSA-N 0.000 abstract description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000010840 domestic wastewater Substances 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
- 230000003000 nontoxic effect Effects 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 239000011574 phosphorus Substances 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 10
- 238000004062 sedimentation Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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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- 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)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention belongs to the technical field of flocculating agents, and particularly relates to a composite flocculating agent for industrial wastewater treatment and a preparation method thereof, wherein the composite flocculating agent comprises the following raw materials in parts by weight: 40-60 parts of polymeric silicon ferric sulfate-organic composite flocculation liquid and 25-45 parts of modified chitosan; by adding the components of the polyferric silicate sulfate, the modified montmorillonite, the polyacrylamide and the modified chitosan, after compounding, the components are mutually coordinated, so that the obtained composite flocculant has high effective components, is very easy to dissolve in water, can be applied to treatment of industrial wastewater and domestic wastewater, particularly can efficiently remove SS, COD, BOD, phosphorus, nitrogen and heavy metal ions in sewage, has higher removal rate, and has the characteristics of less consumption and obvious flocculation effect; the modified chitosan has more excellent surface structure and adsorption bridging capacity of the wall chitosan, is non-toxic and harmless, is easy to biodegrade, and has good flocculation property and adsorptivity.
Description
Technical Field
The invention belongs to the technical field of flocculating agents, and relates to a composite flocculating agent for industrial wastewater treatment and a preparation method thereof.
Background
Because the organic substances in the wastewater are slow in biological metabolism and difficult to completely degrade, the biochemical treatment time is long, and the treatment facilities and the operation cost are very high. The flocculation settling separation method is a very common technology applied in wastewater treatment, and particularly, the composite flocculant draws wide attention at home and abroad due to the advantages of good flocculation effect, good decolorizing capability, easy operation and the like. However, the flocculation method is natural sedimentation by gravity action, the separation time is long, the retention time designed in a sedimentation tank is also long in engineering application, and part of flocs are carried out of the sedimentation separation tank along with turbulent fluctuation of water flow, so that the quality of effluent is reduced.
Disclosure of Invention
The invention aims to provide a composite flocculant for industrial wastewater treatment and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a composite flocculant for industrial wastewater treatment comprises the following raw materials in parts by weight: 40-60 parts of polymeric silicon ferric sulfate-organic composite flocculating solution and 25-45 parts of modified chitosan.
The preparation method of the composite flocculant for industrial wastewater treatment specifically comprises the following steps:
s1, adding the modified chitosan into an electric stirring tank, keeping the temperature in the tank at 50-70 ℃, stirring for 1-3h at the rotation speed of 700-,
s2, slowly adding the polymeric ferric silicosulfate-organic composite flocculating solution, adding the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan according to the proportion of 1:1, controlling the pH value of the liquid in the tank to be 1-3 by using a pH regulator, stirring for 5 hours at the rotation speed of 700-900r/min, uniformly stirring the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan, standing and activating for 5-7 hours, and finally preparing the composite flocculant colloid.
As the preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the preparation method of the polymeric silicon ferric sulfate-organic composite flocculating solution specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10-16 parts of sodium silicate, 20-40 parts of starch, 12-14 parts of sulfuric acid, 13-15 parts of ferrous sulfate, 1.5-3.5 parts of oxidant, 50-100 parts of distilled water, 5-13 parts of stabilizer and 7-9 parts of acrylamide
S2, adding sodium silicate into distilled water, stirring for 10-20min by using a glass rod to completely dissolve the sodium silicate to obtain a sodium silicate solution, and then adjusting the pH value of the sodium silicate solution by using sulfuric acid to 5.2-6.2 to obtain a polysilicic acid solution;
s3, adding ferrous sulfate into distilled water, heating to completely dissolve the ferrous sulfate, uniformly stirring to obtain a ferrous sulfate solution, and mixing the polysilicic acid solution in the S2 and the ferrous sulfate according to the ratio of Si: mixing Fe with the molar ratio of 1, stirring for 1h at the rotation speed of 500-600r/min, adding an oxidant, and curing at 45-55 ℃ for 50-70min to obtain polyferric silicate sulfate;
s4, pouring the poly-silicon ferric sulfate solution of S3 into an electric stirring tank for stirring, adjusting a stirrer in the electric stirring tank to stir for 4-6h at the rotation speed of 600-800r/min, performing an activation process at 50-60 ℃, adding starch after the activation is finished, keeping the stirrer to stir for 1-3h at the rotation speed of 600-800r/min, adding a stabilizer and acrylamide, continuing to stir for 2h, and then standing for 2.5h to obtain the poly-silicon ferric sulfate-organic composite flocculating solution.
As the preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the preparation method of the modified chitosan specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 25-45 parts of chitosan, 5-15 parts of acetic acid, 6-10 parts of catalyst, 15-35 parts of polyacrylamide, 60-80 parts of acetone and 20-26 parts of modified montmorillonite;
s2, dissolving chitosan, adding acetic acid in the dissolving and stirring process, stirring for 10-20min, pouring the solution into an electric stirring tank after the dissolution is finished, controlling the temperature in the tank to be 50-60 ℃, then dropwise adding a catalyst into the electric stirring tank, adjusting the rotating speed of a stirrer in the electric stirring tank to be 500-;
s3, washing the product of the S2 after cooling and standing by acetone for 6-8 times to obtain the modified chitosan.
As a preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the preparation method of the polyacrylamide specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10-16 parts of acrylonitrile, 50-80 parts of pure water, 0.5-0.9 part of skeleton Raney copper, 30-50 parts of resin and 0.9-1.5 parts of initiator;
s2, mixing acrylonitrile and pure water according to the weight ratio of 1: 6.2-6.4, then placing the mixture into a reaction vessel, adding skeleton Raney copper, adjusting the rotating speed of a stirrer in an electric stirring tank to be 400-;
s3, placing the acrylamide aqueous solution of S2 into a batching kettle, adding resin, filling nitrogen into the batching kettle, and extracting a pure acrylamide aqueous solution;
s4, adding pure water and an initiator into the pure acrylamide aqueous solution of S3, putting the mixture into a beaker, and then irradiating the mixture by halogen lamp light for polymerization reaction at the irradiation temperature of 75-77 ℃ for 3.5-3.9 hours to obtain the polyacrylamide.
As the preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the preparation method of the modified montmorillonite comprises the following steps:
s1, preparing the following raw materials in parts by weight: 12-14 parts of montmorillonite, 5-9 parts of ethanol, 50-60 parts of deionized water, 6-10 parts of phenyl tripropyl ammonium chloride, 4-8 parts of dodecyl dimethyl benzyl ammonium chloride and 3-5 parts of iron oxyhydroxide;
s2, stirring and dispersing montmorillonite in an ethanol acid solution, introducing carbon dioxide to saturation, continuously stirring for 5-7h, then heating to 78-80 ℃, and discharging carbon dioxide when heating to obtain montmorillonite suspension;
s3, cooling the montmorillonite suspension prepared in the S2 to 45-47 ℃, adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride, and then continuing to stir for 1-2 hours;
and S4, cooling the reaction product of S3 to 25-27 ℃, adding iron oxyhydroxide into the montmorillonite suspension, stirring and reacting for 1.5-2.5h, and then sequentially discharging, filtering, washing, vacuum drying and grinding to obtain the iron oxyhydroxide modified montmorillonite.
As the preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the catalyst is ammonium persulfate; the stabilizer is one of ammonium thiosulfate, sodium hypophosphite or sodium hydrosulfide; the starch is one of phosphate starch, xanthate starch, acetate starch, oxidized starch and cross-linked starch.
As a preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the initiator is T50; the acid solution is one of hydrochloric acid solution, sulfuric acid solution and nitric acid solution, and the hydrogen ion concentration of the acid solution is 0.4-0.8 mol/L.
As a preferable technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the invention is characterized in that the electric stirring tank comprises a tank body, a circular groove is formed in the inner wall of the top of the tank body, clamping grooves are symmetrically formed in the circular groove, a tank cover is arranged above the tank body, a handle is symmetrically and fixedly connected to the top of the tank cover, fixing rods are symmetrically and fixedly connected to the side wall of the tank cover, the fixing rods are connected with the clamping grooves in a clamping manner, the fixing rods are connected with the circular groove in a sliding manner, a moving platform is fixedly connected to the bottom of the tank body, a plurality of universal wheels are mounted at the bottom of the moving platform, a cart pushing rod is fixedly connected to the right side of the upper surface of the moving platform, a partition plate is fixedly connected to the inner wall of the tank body, a motor mounting seat is mounted at the bottom of the partition plate, a driving motor is mounted on the partition plate through the motor mounting seat, and an output shaft of the driving motor penetrates through the partition plate and then is positioned above the partition plate, the utility model discloses a heating wire, including driving motor, mounting block, slide bar, channel, connecting plate, end fixedly connected with scraper blade, the heating wire has been cup jointed on driving motor's the output shaft, the opening has been seted up to the one end lateral wall of mounting block, and is located the opening part the channel has been seted up to mounting block lateral wall symmetry, be provided with the connecting plate in the opening, and fixedly connected with slide bar on the lateral wall around the connecting plate, slide bar and channel sliding connection, the last fixed surface of connecting plate is connected with the stirring board, the tip fixedly connected with scraper blade of connecting plate, be provided with the heating wire in the jar side wall.
As a preferred technical scheme of the preparation method of the composite flocculant for industrial wastewater treatment, the specific working method of the electric stirring tank comprises the following steps: put into jar internal with corresponding material, the rotating cover makes dead lever and draw-in groove correspond, then dead lever landing draw-in groove bottom to the circular slot in, the rotating cover makes dead lever and draw-in groove keep away from, follow-up start-up driving motor, driving motor drive output shaft rotates, makes the stirring board stir the material, the scraper blade scrapes the material of remaining on jar internal wall, the heating wire heats jar internal wall, and then on heat transfer to the material.
The invention has the beneficial effects that:
(1) by adding the components of the polyferric silicate sulfate, the modified montmorillonite, the polyacrylamide and the modified chitosan, the components are compounded and then are coordinated with one another, the obtained composite flocculant has high effective components, is very easy to dissolve in water, can be applied to treatment of industrial wastewater and domestic wastewater, particularly can efficiently remove SS, COD, BOD, phosphorus, nitrogen and heavy metal ions in sewage, has higher removal rate, and has the characteristics of small dosage and obvious flocculation effect.
(2) The modified chitosan added in the invention has more excellent surface structure and adsorption bridging capability of the wall chitosan, is non-toxic and harmless, is easy to biodegrade, and has good flocculation property and adsorptivity.
(3) The invention has the advantages of high efficiency, no toxicity, low cost and strong flocculation capability when the industrial sewage is treated by adding the polymeric silicon ferric sulfate.
(4) According to the invention, by adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride which are both weakly alkaline and are matched with each other, a good synergistic effect is achieved, the montmorillonite has a good surface modification effect, and after the phenyl tripropyl ammonium chloride and the dodecyl dimethyl benzyl ammonium chloride enter the interlamellar spacing of the montmorillonite, the interlamellar spacing can be supported, and the interlamellar spacing is enlarged.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of a tank structure according to the present invention;
FIG. 2 is an enlarged schematic view of A in FIG. 1;
FIG. 3 is a schematic view of the internal structure of the can body;
FIG. 4 is a schematic view of a mounting block according to the present invention;
FIG. 5 is a schematic view of the structure of the connection plate of the present invention.
In the figure: 1. a tank body; 2. a circular groove; 3. a card slot; 4. a can lid; 5. a handle; 6. fixing the rod; 7. a mobile platform; 8. a trolley pole; 9. a partition plate; 10. a drive motor; 11. mounting blocks; 12. an opening; 13. a channel; 14. a connecting plate; 15. a slide bar; 16. a stirring plate; 17. a squeegee; 18. a heating wire.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A composite flocculant for industrial wastewater treatment comprises the following raw materials in parts by weight: 40 parts of polymeric silicon ferric sulfate-organic composite flocculating solution and 25 parts of modified chitosan.
Further, the preparation method of the composite flocculant for industrial wastewater treatment specifically comprises the following steps:
s1, adding the modified chitosan into an electric stirring tank, keeping the temperature in the tank at 50 ℃, stirring for 1h at the rotating speed of 700r/min,
s2, slowly adding the polymeric ferric silicosulfate-organic composite flocculating solution, adding the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan according to the proportion of 1:1, controlling the pH value of the liquid in the tank to be 1 by using a pH regulator, stirring for 5 hours at the rotation speed of 700r/min, uniformly stirring the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan, standing and activating for 5 hours, and finally preparing the composite flocculant colloid.
Further, the preparation method of the poly-silicon ferric sulfate-organic composite flocculating solution specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10 parts of sodium silicate, 20 parts of starch, 12 parts of sulfuric acid, 13 parts of ferrous sulfate, 1.5 parts of oxidant, 50 parts of distilled water, 5 parts of stabilizer and 7 parts of acrylamide
S2, adding sodium silicate into distilled water, stirring for 10min by using a glass rod to completely dissolve the sodium silicate to obtain a sodium silicate solution, and then adjusting the pH value of the sodium silicate solution by using sulfuric acid to enable the pH value to be 5.2 to obtain a polysilicic acid solution;
s3, adding ferrous sulfate into distilled water, heating to completely dissolve the ferrous sulfate, uniformly stirring to obtain a ferrous sulfate solution, and mixing the polysilicic acid solution in the S2 and the ferrous sulfate according to the ratio of Si: mixing Fe with the molar ratio of 1, stirring for 1h at the rotating speed of 500r/min, adding an oxidant, and curing for 50min at 45 ℃ to obtain polyferric silicate sulfate;
and S4, pouring the poly-silicon ferric sulfate solution of S3 into an electric stirring tank for stirring, adjusting a stirrer in the electric stirring tank to stir for 4 hours at the rotating speed of 600r/min, carrying out an activation process at 50 ℃, adding starch into the mixture after the activation is finished, keeping the stirrer to stir for 1 hour at the rotating speed of 600r/min, adding a stabilizer and acrylamide, continuing to stir for 2 hours, and standing for 2.5 hours to obtain the poly-silicon ferric sulfate-organic composite flocculating solution.
Further, the preparation method of the modified chitosan specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 25 parts of chitosan, 5 parts of acetic acid, 6 parts of catalyst, 15 parts of polyacrylamide, 60 parts of acetone and 20 parts of modified montmorillonite;
s2, dissolving chitosan, adding acetic acid in the dissolving and stirring process, stirring for 10min, pouring the solution into an electric stirring tank after the dissolution is finished, controlling the temperature in the tank to be 50 ℃, then dropwise adding a catalyst into the electric stirring tank, adjusting the rotating speed of a stirrer in the electric stirring tank to be 300r/min, stirring for 60min, adding reactive polyacrylamide and modified montmorillonite after the full dissolution, continuing to keep the rotating speed of the stirrer to be 300r/min and keeping the temperature at 50 ℃, stirring for reaction for 1h, and then cooling and standing for 2 h;
and S3, washing the product of the S2 after cooling and standing by acetone for 6 times to obtain the modified chitosan.
Further, the preparation method of the polyacrylamide specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10 parts of acrylonitrile, 50 parts of pure water, 0.5 part of skeleton Raney copper, 30 parts of resin and 0.9 part of initiator;
s2, mixing acrylonitrile and pure water according to the weight ratio of 1: 6.2, then placing the mixture into a reaction vessel, adding skeleton Raney copper, adjusting the rotating speed of a stirrer in an electric stirring tank to 400r/min, and then heating the liquid in the tank to 100 ℃ to prepare an acrylamide aqueous solution;
s3, placing the acrylamide aqueous solution of S2 into a batching kettle, adding resin, filling nitrogen into the batching kettle, and extracting a pure acrylamide aqueous solution;
s4, adding pure water and an initiator into the pure acrylamide aqueous solution of S3, putting the mixture into a beaker, and then irradiating the mixture by halogen lamp light for polymerization reaction at the irradiation temperature of 75 ℃ for 3.5 hours to obtain the polyacrylamide.
Further, the preparation method of the modified montmorillonite comprises the following steps:
s1, preparing the following raw materials in parts by weight: 12 parts of montmorillonite, 5 parts of ethanol, 50 parts of deionized water, 6 parts of phenyl tripropyl ammonium chloride, 4 parts of dodecyl dimethyl benzyl ammonium chloride and 3 parts of iron oxyhydroxide;
s2, stirring and dispersing montmorillonite in an ethanol acid solution, introducing carbon dioxide to saturation, continuously stirring for 5 hours, then heating to 78 ℃, and discharging carbon dioxide when heating to obtain montmorillonite suspension;
s3, cooling the montmorillonite suspension prepared in the S2 to 45 ℃, adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride, and then continuing stirring for 1 h;
and S4, cooling the reaction product of S3 to 25 ℃, adding iron oxyhydroxide into the montmorillonite suspension, stirring for reaction for 1.5h, and then sequentially discharging, filtering, washing, vacuum drying and grinding to obtain the iron oxyhydroxide modified montmorillonite.
Further, the catalyst is ammonium persulfate; the stabilizer is one of ammonium thiosulfate, sodium hypophosphite or sodium hydrosulfide; the starch is one of phosphate starch, xanthate starch, acetate starch, oxidized starch and cross-linked starch.
Further, the initiator is T50; the acid solution is one of hydrochloric acid solution, sulfuric acid solution and nitric acid solution, and the hydrogen ion concentration of the acid solution is 0.4 mol/L.
Example 2
A composite flocculant for industrial wastewater treatment comprises the following raw materials in parts by weight: 50 parts of poly-silicon ferric sulfate-organic composite flocculating solution and 35 parts of modified chitosan.
Further, the preparation method of the composite flocculant for industrial wastewater treatment specifically comprises the following steps:
s1, adding the modified chitosan into an electric stirring tank, keeping the temperature in the tank at 60 ℃, stirring for 2h at the rotating speed of 800r/min,
s2, slowly adding the polymeric ferric silicosulfate-organic composite flocculating solution, adding the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan according to the proportion of 1:1, controlling the pH value of the liquid in the tank to be 2 by using a pH regulator, stirring for 5 hours at the rotation speed of 800r/min, uniformly stirring the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan, standing and activating for 6 hours, and finally preparing the composite flocculant colloid.
Further, the preparation method of the poly-silicon ferric sulfate-organic composite flocculating solution specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 13 parts of sodium silicate, 30 parts of starch, 13 parts of sulfuric acid, 14 parts of ferrous sulfate, 2.5 parts of oxidant, 75 parts of distilled water, 9 parts of stabilizer and 8 parts of acrylamide
S2, adding sodium silicate into distilled water, stirring for 15min by using a glass rod to completely dissolve the sodium silicate to obtain a sodium silicate solution, and then adjusting the pH value of the sodium silicate solution by using sulfuric acid to 5.7 to obtain a polysilicic acid solution;
s3, adding ferrous sulfate into distilled water, heating to completely dissolve the ferrous sulfate, uniformly stirring to obtain a ferrous sulfate solution, and mixing the polysilicic acid solution in the S2 and the ferrous sulfate according to the ratio of Si: mixing Fe with the molar ratio of 1, stirring at the rotation speed of 550r/min for 1h, adding an oxidant, and curing at 50 ℃ for 60in to obtain polyferric silicate sulfate;
and S4, pouring the poly-silicon ferric sulfate solution of S3 into an electric stirring tank for stirring, adjusting a stirrer in the electric stirring tank to stir for 5 hours at the rotating speed of 700r/min, carrying out an activation process at 55 ℃, adding starch into the mixture after the activation is finished, keeping the stirrer to stir for 2 hours at the rotating speed of 700r/min, adding a stabilizer and acrylamide, continuing to stir for 2 hours, and standing for 2.5 hours to obtain the poly-silicon ferric sulfate-organic composite flocculating solution.
Further, the preparation method of the modified chitosan specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 35 parts of chitosan, 10 parts of acetic acid, 8 parts of catalyst, 25 parts of polyacrylamide, 70 parts of acetone and 23 parts of modified montmorillonite;
s2, dissolving chitosan, adding acetic acid in the dissolving and stirring process, stirring for 15min, pouring the solution into an electric stirring tank after the dissolution is finished, controlling the temperature in the tank to be 55 ℃, then dropwise adding a catalyst into the electric stirring tank, adjusting the rotating speed of a stirrer in the electric stirring tank to be 400r/min, stirring for 70min, adding reactive polyacrylamide and modified montmorillonite after the dissolution is complete, continuing to keep the rotating speed of the stirrer to be 400r/min and keeping the temperature to be 55 ℃, stirring for reaction for 2h, and then cooling and standing for 2 h;
and S3, washing the product of the S2 after cooling and standing by using acetone, and washing for 7 times to obtain the modified chitosan.
Further, the preparation method of the polyacrylamide specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 13 parts of acrylonitrile, 65 parts of pure water, 0.7 part of skeleton Raney copper, 40 parts of resin and 1.2 parts of initiator;
s2, mixing acrylonitrile and pure water according to the weight ratio of 1: 6.3, putting the mixture into a reaction container, adding skeleton Raney copper, adjusting the rotating speed of a stirrer in an electric stirring tank to be 450r/min, and heating the liquid in the tank to 120 ℃ to obtain an acrylamide aqueous solution;
s3, placing the acrylamide aqueous solution of S2 into a batching kettle, adding resin, filling nitrogen into the batching kettle, and extracting a pure acrylamide aqueous solution;
s4, adding pure water and an initiator into the pure acrylamide aqueous solution of S3, putting the mixture into a beaker, and then irradiating the mixture by halogen lamp light for polymerization reaction at the irradiation temperature of 76 ℃ for 3.7 hours to obtain the polyacrylamide.
Further, the preparation method of the modified montmorillonite comprises the following steps:
s1, preparing the following raw materials in parts by weight: 13 parts of montmorillonite, 7 parts of ethanol, 55 parts of deionized water, 8 parts of phenyl tripropyl ammonium chloride, 6 parts of dodecyl dimethyl benzyl ammonium chloride and 4 parts of iron oxyhydroxide;
s2, stirring and dispersing montmorillonite in an ethanol acid solution, introducing carbon dioxide to saturation, continuously stirring for 6 hours, then heating to 79 ℃, and discharging carbon dioxide when heating to obtain montmorillonite suspension;
s3, cooling the montmorillonite suspension prepared in the S2 to 46 ℃, adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride, and then continuing to stir for 1.5 hours;
and S4, cooling the reaction product of S3 to 26 ℃, adding iron oxyhydroxide into the montmorillonite suspension, stirring for reaction for 2 hours, and then sequentially discharging, filtering, washing, vacuum drying and grinding to obtain the iron oxyhydroxide modified montmorillonite.
Further, the catalyst is ammonium persulfate; the stabilizer is one of ammonium thiosulfate, sodium hypophosphite or sodium hydrosulfide; the starch is one of phosphate starch, xanthate starch, acetate starch, oxidized starch and cross-linked starch.
Further, the initiator is T50; the acid solution is one of hydrochloric acid solution, sulfuric acid solution and nitric acid solution, and the hydrogen ion concentration of the acid solution is 0.6 mol/L.
Example 3
A composite flocculant for industrial wastewater treatment comprises the following raw materials in parts by weight: 60 parts of polymeric silicon ferric sulfate-organic composite flocculating solution and 45 parts of modified chitosan.
Further, the preparation method of the composite flocculant for industrial wastewater treatment specifically comprises the following steps:
s1, adding the modified chitosan into an electric stirring tank, keeping the temperature in the tank at 70 ℃, stirring for 3 hours at the rotating speed of 900r/min,
s2, slowly adding the polymeric ferric silicosulfate-organic composite flocculating solution, adding the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan according to the proportion of 1:1, controlling the pH value of the liquid in the tank to be 3 by using a pH regulator, stirring for 5 hours at the rotation speed of 900r/min, uniformly stirring the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan, standing and activating for 7 hours, and finally preparing the composite flocculant colloid.
Further, the preparation method of the poly-silicon ferric sulfate-organic composite flocculating solution specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 16 parts of sodium silicate, 40 parts of starch, 14 parts of sulfuric acid, 15 parts of ferrous sulfate, 3.5 parts of oxidant, 100 parts of distilled water, 13 parts of stabilizer and 9 parts of acrylamide
S2, adding sodium silicate into distilled water, stirring for 20min by using a glass rod to completely dissolve the sodium silicate to obtain a sodium silicate solution, and then adjusting the pH value of the sodium silicate solution by using sulfuric acid to obtain a polysilicic acid solution, wherein the pH value is 6.2;
s3, adding ferrous sulfate into distilled water, heating to completely dissolve the ferrous sulfate, uniformly stirring to obtain a ferrous sulfate solution, and mixing the polysilicic acid solution in the S2 and the ferrous sulfate according to the ratio of Si: mixing Fe with the molar ratio of 1, stirring for 1h at the rotating speed of 600r/min, adding an oxidant, and curing for 70min at 55 ℃ to obtain polymeric ferric silicate sulfate;
and S4, pouring the poly-silicon ferric sulfate solution of S3 into an electric stirring tank for stirring, adjusting a stirrer in the electric stirring tank to stir for 4-6 hours at the rotating speed of 800r/min, carrying out an activation process at 60 ℃, adding starch after the activation is finished, keeping the stirrer to stir for 3 hours at the rotating speed of 800r/min, adding a stabilizer and acrylamide, continuing to stir for 2 hours, and standing for 2.5 hours to obtain the poly-silicon ferric sulfate-organic composite flocculating solution.
Further, the preparation method of the modified chitosan specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 45 parts of chitosan, 15 parts of acetic acid, 10 parts of catalyst, 35 parts of polyacrylamide, 80 parts of acetone and 26 parts of modified montmorillonite;
s2, dissolving chitosan, adding acetic acid in the dissolving and stirring process, stirring for 20min, pouring the solution into an electric stirring tank after the dissolution is finished, controlling the temperature in the tank to be 60 ℃, then dropwise adding a catalyst into the electric stirring tank, adjusting the rotating speed of a stirrer in the electric stirring tank to be 500r/min, stirring for 80min, adding reactive polyacrylamide and modified montmorillonite after the full dissolution, continuing to keep the rotating speed of the stirrer to be 500r/min and keeping the temperature to be 60 ℃, stirring for reaction for 3h, and then cooling and standing for 2 h;
and S3, washing the product of the S2 after cooling and standing by acetone for 8 times to obtain the modified chitosan.
Further, the preparation method of the polyacrylamide specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 16 parts of acrylonitrile, 80 parts of pure water, 0.9 part of skeleton Raney copper, 50 parts of resin and 1.5 parts of initiator;
s2, mixing acrylonitrile and pure water according to the weight ratio of 1: 6.4, putting the mixture into a reaction container, adding skeleton Raney copper, adjusting the rotating speed of a stirrer in an electric stirring tank to be 500r/min, and heating the liquid in the tank to 140 ℃ to obtain an acrylamide aqueous solution;
s3, placing the acrylamide aqueous solution of S2 into a batching kettle, adding resin, filling nitrogen into the batching kettle, and extracting a pure acrylamide aqueous solution;
s4, adding pure water and an initiator into the pure acrylamide aqueous solution of S3, putting the mixture into a beaker, and then irradiating the mixture by halogen lamp light for polymerization reaction at the irradiation temperature of 77 ℃ for 3.9 hours to obtain the polyacrylamide.
Further, the preparation method of the modified montmorillonite comprises the following steps:
s1, preparing the following raw materials in parts by weight: 14 parts of montmorillonite, 9 parts of ethanol, 60 parts of deionized water, 10 parts of phenyl tripropyl ammonium chloride, 8 parts of dodecyl dimethyl benzyl ammonium chloride and 5 parts of iron oxyhydroxide;
s2, stirring and dispersing montmorillonite in an ethanol acid solution, introducing carbon dioxide to saturation, continuously stirring for 7 hours, then heating to 80 ℃, and discharging carbon dioxide when heating to obtain montmorillonite suspension;
s3, cooling the montmorillonite suspension prepared in the S2 to 47 ℃, adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride, and then continuing stirring for 2 hours;
and S4, cooling the reaction product of S3 to 27 ℃, adding iron oxyhydroxide into the montmorillonite suspension, stirring for reaction for 2.5 hours, and then sequentially discharging, filtering, washing, vacuum drying and grinding to obtain the iron oxyhydroxide modified montmorillonite.
Further, the catalyst is ammonium persulfate; the stabilizer is one of ammonium thiosulfate, sodium hypophosphite or sodium hydrosulfide; the starch is one of phosphate starch, xanthate starch, acetate starch, oxidized starch and cross-linked starch.
Further, the initiator is T50; the acid solution is one of hydrochloric acid solution, sulfuric acid solution and nitric acid solution, and the hydrogen ion concentration of the acid solution is 0.8 mol/L.
Further, as shown in fig. 1-5, the electric stirring tank comprises a tank body, a circular groove is formed on the inner wall of the top of the tank body, clamping grooves are symmetrically formed on the circular groove, a tank cover is arranged above the tank body, a handle is symmetrically and fixedly connected to the top of the tank cover, fixing rods are symmetrically and fixedly connected to the side wall of the tank cover, the fixing rods are clamped and connected with the clamping grooves and are slidably connected with the circular groove, a moving platform is fixedly connected to the bottom of the tank body, a plurality of universal wheels are mounted at the bottom of the moving platform, a cart pushing rod is fixedly connected to the right side of the upper surface of the moving platform, a partition plate is fixedly connected to the inner wall of the tank body, a motor mounting seat is mounted at the bottom of the partition plate, a driving motor is mounted on the partition plate through the motor mounting seat, an output shaft of the driving motor penetrates through the partition plate and then is located above the partition plate, and a plurality of mounting blocks are sleeved on the output shaft of the driving motor, the one end lateral wall of installation piece has seted up the opening, and is located the opening part the channel has been seted up to installation piece lateral wall symmetry, be provided with the connecting plate in the opening, and fixedly connected with slide bar on the lateral wall around the connecting plate, slide bar and channel sliding connection, the last fixed surface of connecting plate is connected with the stirring board, the tip fixedly connected with scraper blade of connecting plate, be provided with the heater strip in the jar side wall.
Further, the specific working method of the electric stirring tank comprises the following steps: put into jar internal with corresponding material, the rotating cover makes dead lever and draw-in groove correspond, then dead lever landing draw-in groove bottom to the circular slot in, the rotating cover makes dead lever and draw-in groove keep away from, follow-up start-up driving motor, driving motor drive output shaft rotates, makes the stirring board stir the material, the scraper blade scrapes the material of remaining on jar internal wall, the heating wire heats jar internal wall, and then on heat transfer to the material.
Comparative example 1
Modified montmorillonite in the raw materials of the embodiment 1 is removed, and the rest raw materials and the preparation process thereof are unchanged.
Comparative example 2
The polyacrylamide in the raw material of the example 2 is removed, and the rest raw materials and the preparation process are not changed.
Comparative example 3
Modified chitosan in the raw materials of the embodiment 3 is removed, and the rest raw materials and the preparation process thereof are not changed.
Comparative example 4
The comparative example is a flocculant commonly found in the market.
The test results are shown in the following table:
| test items | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| Oil removal (%) | 90.18 | 89.56 | 90.32 | 55.96 | 48.98 | 52.74 | 51.47 |
| Turbidity removal rate (%) | 85.48 | 83.49 | 84.54 | 40.12 | 42.52 | 43.23 | 56.75 |
| Speed of flocculation | Fastest speed | Fastest speed | Fastest speed | In general | In general | In general | In general |
| Settling velocity | Is quicker | Is quicker | Is quicker | In general | In general | In general | In general |
| COD（mg/L） | 110.73 | 105.85 | 121.26 | 201.56 | 250.48 | 312.96 | 240.31 |
| pH | 7.13 | 7.15 | 7.17 | 5.65 | 5.78 | 5.23 | 6.12 |
As can be seen from the above table, the test results of examples 1-3 in the items of oil removal rate, turbidity removal rate, flocculation speed, sedimentation speed, COD and pH are all superior to the comparative examples, which shows that the composite flocculant prepared by the invention can effectively reduce COD in industrial wastewater, improve oil removal rate and turbidity removal rate, improve flocculation and sedimentation speed, and the wastewater is neutral after use and can be used for recovery, thus having great application value in the technical field of flocculants.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A composite flocculant for industrial wastewater treatment is characterized in that: the feed comprises the following raw materials in parts by weight: 40-60 parts of polymeric silicon ferric sulfate-organic composite flocculating solution and 25-45 parts of modified chitosan.
2. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 1, characterized by comprising the following steps: the method comprises the following steps:
s1, adding the modified chitosan into an electric stirring tank, keeping the temperature in the tank at 50-70 ℃, stirring for 1-3h at the rotation speed of 700-,
s2, slowly adding the polymeric ferric silicosulfate-organic composite flocculating solution, adding the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan according to the proportion of 1:1, controlling the pH value of the liquid in the tank to be 1-3 by using a pH regulator, stirring for 5 hours at the rotation speed of 700-900r/min, uniformly stirring the polymeric ferric chloride-organic composite flocculating solution and the modified chitosan, standing and activating for 5-7 hours, and finally preparing the composite flocculant colloid.
3. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 2, characterized in that: the preparation method of the poly-silicon ferric sulfate-organic composite flocculation liquid comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10-16 parts of sodium silicate, 20-40 parts of starch, 12-14 parts of sulfuric acid, 13-15 parts of ferrous sulfate, 1.5-3.5 parts of oxidant, 50-100 parts of distilled water, 5-13 parts of stabilizer and 7-9 parts of acrylamide;
s2, adding sodium silicate into distilled water, stirring for 10-20min by using a glass rod to completely dissolve the sodium silicate to obtain a sodium silicate solution, and then adjusting the pH value of the sodium silicate solution by using sulfuric acid to 5.2-6.2 to obtain a polysilicic acid solution;
s3, adding ferrous sulfate into distilled water, heating to completely dissolve the ferrous sulfate, uniformly stirring to obtain a ferrous sulfate solution, and mixing the polysilicic acid solution in the S2 and the ferrous sulfate according to the ratio of Si: mixing Fe with the molar ratio of 1, stirring for 1h at the rotation speed of 500-600r/min, adding an oxidant, and curing at 45-55 ℃ for 50-70min to obtain polyferric silicate sulfate;
s4, pouring the poly-silicon ferric sulfate solution of S3 into an electric stirring tank for stirring, adjusting a stirrer in the electric stirring tank to stir for 4-6h at the rotation speed of 600-800r/min, performing an activation process at 50-60 ℃, adding starch after the activation is finished, keeping the stirrer to stir for 1-3h at the rotation speed of 600-800r/min, adding a stabilizer and acrylamide, continuing to stir for 2h, and then standing for 2.5h to obtain the poly-silicon ferric sulfate-organic composite flocculating solution.
4. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 2, characterized in that: the preparation method of the modified chitosan specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 25-45 parts of chitosan, 5-15 parts of acetic acid, 6-10 parts of catalyst, 15-35 parts of polyacrylamide, 60-80 parts of acetone and 20-26 parts of modified montmorillonite;
s2, dissolving chitosan, adding acetic acid in the dissolving and stirring process, stirring for 10-20min, pouring the solution into an electric stirring tank after the dissolution is finished, controlling the temperature in the tank to be 50-60 ℃, then dropwise adding a catalyst into the electric stirring tank, adjusting the rotating speed of a stirrer in the electric stirring tank to be 500-;
s3, washing the product of the S2 after cooling and standing with acetone for 6-8 times to obtain the modified chitosan.
5. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 4, characterized by comprising the steps of: the preparation method of the polyacrylamide specifically comprises the following steps:
s1, preparing the following raw materials in parts by weight: 10-16 parts of acrylonitrile, 50-80 parts of pure water, 0.5-0.9 part of skeleton Raney copper, 30-50 parts of resin and 0.9-1.5 parts of initiator;
s2, mixing acrylonitrile and pure water according to the weight ratio of 1: 6.2-6.4, then placing the mixture into a reaction vessel, adding skeleton Raney copper, adjusting the rotating speed of a stirrer in an electric stirring tank to be 400-;
s3, placing the acrylamide aqueous solution of S2 into a batching kettle, adding resin, filling nitrogen into the batching kettle, and extracting a pure acrylamide aqueous solution;
s4, adding pure water and an initiator into the pure acrylamide aqueous solution of S3, putting into a beaker, and then irradiating by using halogen lamp light to carry out polymerization reaction, wherein the irradiation temperature is 75-77 ℃, and the irradiation time is 3.5-3.9 hours, thus obtaining the polyacrylamide.
6. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 4, characterized in that: the preparation method of the modified montmorillonite comprises the following steps:
s1, preparing the following raw materials in parts by weight: 12-14 parts of montmorillonite, 5-9 parts of ethanol, 50-60 parts of deionized water, 6-10 parts of phenyl tripropyl ammonium chloride, 4-8 parts of dodecyl dimethyl benzyl ammonium chloride and 3-5 parts of iron oxyhydroxide;
s2, stirring and dispersing montmorillonite in an ethanol acid solution, introducing carbon dioxide to saturation, continuously stirring for 5-7h, then heating to 78-80 ℃, and discharging carbon dioxide when heating to obtain montmorillonite suspension;
s3, cooling the montmorillonite suspension prepared in the S2 to 45-47 ℃, adding phenyl tripropyl ammonium chloride and dodecyl dimethyl benzyl ammonium chloride, and then continuing to stir for 1-2 hours;
s4, cooling the reaction product of S3 to 25-27 ℃, adding iron oxyhydroxide into the montmorillonite suspension, stirring and reacting for 1.5-2.5h, and then discharging, filtering, washing, vacuum drying and grinding in sequence to obtain the iron oxyhydroxide modified montmorillonite.
7. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 3, characterized in that: the catalyst is ammonium persulfate; the stabilizer is one of ammonium thiosulfate, sodium hypophosphite or sodium hydrosulfide; the starch is one of phosphate starch, xanthate starch, acetate starch, oxidized starch and cross-linked starch.
8. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 5, characterized in that: the initiator is T50; the acid solution is one of hydrochloric acid solution, sulfuric acid solution and nitric acid solution, and the hydrogen ion concentration of the acid solution is 0.4-0.8 mol/L.
9. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 2, characterized in that: the electric stirring tank comprises a tank body (1), wherein a circular groove (2) is formed in the inner wall of the top of the tank body (1), clamping grooves (3) are symmetrically formed in the circular groove (2), a tank cover (4) is arranged above the tank body (1), handles (5) are symmetrically and fixedly connected to the top of the tank cover (4), fixing rods (6) are symmetrically and fixedly connected to the side wall of the tank cover (4), the fixing rods (6) are connected with the clamping grooves (3) in a clamping manner, the fixing rods (6) are connected with the circular groove (2) in a sliding manner, a moving platform (7) is fixedly connected to the bottom of the tank body (1), a plurality of universal wheels are installed at the bottom of the moving platform (7), a cart pushing rod (8) is fixedly connected to the right side of the upper surface of the moving platform (7), a partition plate (9) is fixedly connected to the inner wall of the tank body (1), a motor mounting seat is installed at the bottom of the partition plate (9), a driving motor (10) is installed on the partition plate (9) through the motor mounting seat, the utility model discloses a heating device, including driving motor (10), baffle (9), channel (13), opening (12), slide bar (15) and channel (13), the output shaft of driving motor (10) runs through baffle (9) back and is located baffle (9) top, a plurality of installation piece (11) has been cup jointed on the output shaft of driving motor (10), opening (12) have been seted up to the one end lateral wall of installation piece (11), and be located opening (12) place installation piece (11) lateral wall symmetry has seted up channel (13), be provided with connecting plate (14) in opening (12), and fixedly connected with slide bar (15) on the lateral wall around connecting plate (14), slide bar (15) and channel (13) sliding connection, the last fixed surface of connecting plate (14) is connected with stirring board (16), the tip fixedly connected with scraper blade (17) of connecting plate (14), be provided with heater strip (18) in the jar body (1) lateral wall.
10. The method for preparing the composite flocculant for industrial wastewater treatment according to claim 9, characterized in that: the specific working method of the electric stirring tank comprises the following steps: put into jar body (1) with corresponding material in, rotating cover (4), make dead lever (6) correspond with draw-in groove (3), then dead lever (6) landing draw-in groove (3) bottom is to circular slot (2) in, rotating cover (4), make dead lever (6) keep away from with draw-in groove (3), follow-up start-up driving motor (10), driving motor (10) drive output shaft rotates, make stirring board (16) stir the material, scraper blade (17) scrape the material of remaining on jar body (1) inner wall and fall, heater strip (18) heat jar body (1) inner wall, and then heat transfer to the material on.
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