CN113104900A - Composite polyaluminum ferric chloride flocculating dephosphorization agent and preparation method thereof - Google Patents
Composite polyaluminum ferric chloride flocculating dephosphorization agent and preparation method thereof Download PDFInfo
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- 229910021578 Iron(III) chloride Inorganic materials 0.000 title claims abstract description 70
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 title claims abstract description 70
- 230000003311 flocculating effect Effects 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920001661 Chitosan Polymers 0.000 claims abstract description 14
- 125000002091 cationic group Chemical group 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 66
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 239000012670 alkaline solution Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 230000035484 reaction time Effects 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 34
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 34
- 239000011574 phosphorus Substances 0.000 abstract description 34
- 230000000694 effects Effects 0.000 description 18
- 150000001875 compounds Chemical class 0.000 description 16
- 238000005189 flocculation Methods 0.000 description 15
- 230000016615 flocculation Effects 0.000 description 15
- 239000010865 sewage Substances 0.000 description 15
- 238000003756 stirring Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 229910019142 PO4 Inorganic materials 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 4
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000011151 fibre-reinforced plastic Substances 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- -1 phosphate ester Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- HVAUUPRFYPCOCA-AREMUKBSSA-N 2-O-acetyl-1-O-hexadecyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCCOC[C@@H](OC(C)=O)COP([O-])(=O)OCC[N+](C)(C)C HVAUUPRFYPCOCA-AREMUKBSSA-N 0.000 description 1
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 101000735376 Homo sapiens Protocadherin-8 Proteins 0.000 description 1
- 108010003541 Platelet Activating Factor Proteins 0.000 description 1
- 102100034958 Protocadherin-8 Human genes 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- YVBBRRALBYAZBM-UHFFFAOYSA-N perfluorooctane Chemical compound FC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YVBBRRALBYAZBM-UHFFFAOYSA-N 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/009—Compounds containing, besides iron, two or more other elements, with the exception of oxygen or hydrogen
-
- 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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention provides a composite polyaluminum ferric chloride flocculating and dephosphorizing agent and a preparation method thereof, wherein the composite polyaluminum ferric chloride flocculating and dephosphorizing agent is formed by mixing polyaluminum ferric chloride, cationic polyacrylamide and chitosan, and the mass ratio of the polyaluminum ferric chloride to the cationic polyacrylamide to the chitosan is 500:1: 0.5-500: 1: 2. The preparation method comprises the step of adding AlCl at room temperature under the condition that the alkalization degree is 0.1-0.53·6H2O solution and FeCl3·6H2Carrying out polymerization reaction on the O solution, drying and grinding to obtain polyaluminum ferric chloride powder, and preparing the polyaluminum ferric chloride solution by using the powder; and mixing the polyaluminum ferric chloride solution, the cationic polyacrylamide solution and the chitosan solution according to the mass ratio of solute polyaluminum ferric chloride, cationic polyacrylamide and chitosan of 500:1: 0.5-500: 1:2 to obtain the composite polyaluminum ferric chloride flocculating and dephosphorizing agent. The invention can efficiently remove turbidity and phosphorus, so that the water quality is stable and reaches the standard.
Description
Technical Field
The invention belongs to the technical field of preparation of water treatment agents, and particularly relates to a composite polyaluminum ferric chloride flocculating and dephosphorizing agent and a preparation method thereof.
Background
In recent years, with the increasing requirement of environmental protection, the requirement of Total Phosphorus (TP) in the sewage discharge standard of the urban sewage treatment plant is more and more strict, and the urban sewage treatment plant usually adopts a biochemical method and is supplemented with a chemical method for removing phosphorus to realize the discharge of the effluent reaching the standard. At present, commonly used phosphorus removal agents of sewage plants mainly comprise aluminum salt and ferric salt, but the treatment effect of a single variety of flocculating agent is changed along with the change of water temperature, pollutant concentration and pH value and is generally limited to a certain extent. In order to realize the advantage complementation of various components, the compound flocculating and dephosphorizing agent is widely concerned.
Polyaluminum ferric chloride (PAFC) is used as a novel inorganic composite polymeric flocculant, has the advantages of polyaluminum chloride (PAC) and polyferric chloride (PFC), can overcome the defects of slow generation of aluminum salt floc, light floc, slow sedimentation, overproof residual aluminum in treated water, poor stability of ferric salt and large chroma of effluent, has stronger electric neutralization, adsorption bridging and rolling sweeping effects, and has the advantages of large formed floc, high sedimentation speed, wide pH application range, low price and good flocculation and dephosphorization capability. The inorganic-organic composite flocculant formed by mixing and compounding the PAFC and the organic flocculant can make full use of the high positive charge density of the inorganic flocculant and the bridging action of the organic polymeric flocculant to make up the defects of small inorganic flocculant floc, large adding amount, high toxicity of the organic flocculant and high cost, and has wide water use range, high flocculation efficiency and wide application prospect. However, the preparation research of the inorganic-organic composite flocculant at present mainly aims at removing suspended matters, and the preparation research of the composite flocculant with better turbidity removal and phosphorus removal capabilities is relatively less.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a composite polyaluminum ferric chloride flocculating and dephosphorizing agent and a preparation method thereof so as to realize high-efficiency flocculating and dephosphorizing water treatment effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
the composite polyaluminum ferric chloride flocculating and dephosphorizing agent is characterized by being formed by mixing polyaluminum ferric chloride, cationic polyacrylamide and chitosan in a mass ratio of 500:1: 0.5-500: 1: 2.
The preparation method of the composite polyaluminum ferric chloride flocculating and dephosphorizing agent provided by the second aspect of the invention is characterized by comprising the following steps:
(1) to contain AlCl3·6H2O and FeCl3·6H2Adding an alkaline solution into the solution A of O until the alkalization degree of the solution A reaches 0.1-0.5, carrying out polymerization reaction, drying and grinding to obtain polyaluminum ferric chloride powder, wherein AlCl is contained in the solution A3·6H2O and FeCl3·6H2The molar mass ratio of O is 9: 1-6: 4; dissolving the polyaluminum ferric chloride powder in water to obtain a polyaluminum ferric chloride solution;
(2) respectively preparing a cationic polyacrylamide solution and a chitosan solution; and mixing the polyaluminum ferric chloride solution, the cationic polyacrylamide solution and the chitosan solution according to the mass ratio of solute polyaluminum ferric chloride, cationic polyacrylamide and chitosan of 500:1: 0.5-500: 1:2 to obtain the composite polyaluminum ferric chloride flocculating and dephosphorizing agent.
Further, in the step (1), the time of the polymerization reaction is 16 to 20 hours.
Further, in the step (1), the polymerization reaction is carried out under room temperature conditions.
Further, in the step (1), the room temperature is 20-40 ℃.
Further, in the step (1), the drying temperature was 60 ℃.
Further, in the step (1), NaOH and NaCO are adopted as alkaline solution3And NaHCO3And the like.
Further, in the step (2), the solvent of the chitosan solution is a mixture of one or more of acetic acid, hydrochloric acid and formic acid.
The invention has the beneficial effects that:
1. the compound polyaluminum ferric chloride flocculating and dephosphorizing agent is prepared by mixing and compounding proper cationic organic polymeric flocculant PAM in PAFC+And CTS. PAM and CTS can promote flocculation and sedimentation of colloid and suspended particles in water through the actions of electric neutralization, adsorption bridging and the like, and improve flocculation turbidity removal and phosphorus removal effects of PAFC.
2. The compound polyaluminum ferric chloride flocculating and dephosphorizing agent has the advantages of high floc generation speed and high sedimentation speed, and can realize better flocculating, turbidity removing and dephosphorizing effects at lower dosage; and can properly adjust PAFC and PAM in the composite polyaluminum ferric chloride flocculating and dephosphorizing agent according to different water qualities+And CTS, so that efficient turbidity and phosphorus removal are realized, and the water quality is stable and reaches the standard.
3. The preparation method of the compound polyaluminum ferric chloride flocculating and dephosphorizing agent has simple and feasible process, low equipment investment and simple operation.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1: preparation of composite polyaluminum ferric chloride (marked as cPAFC) flocculation phosphorus removal agent
In the first step, the preparation of the PAFC (marked as PAFC (r)) solid flocculating and dephosphorizing agent: 7.28g of AlCl3·6H2O and 0.91g FeCl3·6H2Adding O into a beaker, adding 80mL of water, stirring at room temperature until the O is completely dissolved to obtain a solution A1, slowly adding a NaOH solution into the solution A1 under the stirring state until the alkalization degree of the solution A1 is 0.1, continuously stirring for 4 hours, stopping stirring, standing the obtained liquid product at room temperature (20-40 ℃), and agingAfter reacting for 18 hours (polymerization reaction is carried out in the process), drying at 60 ℃, cooling to room temperature, and grinding to obtain the PAFC solid flocculating and dephosphorizing agent.
Step two, preparing a PAFC liquid flocculating and dephosphorizing agent: adding 1.00g of PAFC powder into a beaker, adding 20mL of water and stirring until the PAFC powder is completely dissolved to obtain the PAFC liquid flocculating and dephosphorizing agent.
Third step, PAM+Preparation of the solution: 0.01g of PAM+Adding into a beaker, adding 20mL of water and stirring until the water is completely dissolved to obtain PAM+And (3) solution.
Fourth, PAFC-PAM+Preparation of the solution: mixing the PAFC solution and PAM+Mixing and compounding the solution according to the volume ratio of 5:1 to obtain PAFC-PAM+And (3) solution. PAFC-PAM+PAFC and PAM in solution+The mass ratio of (A) to (B) is 500: 1.
Step five, preparing a CTS solution: adding 0.01g of CTS into a beaker, adding 20mL of 2% acetic acid solution, and stirring until the solution is completely dissolved to obtain the CTS solution.
Sixthly, preparing the compound polyaluminum ferric chloride flocculating and dephosphorizing agent: subjecting the PAFC-PAM obtained above to+The solution and the CTS solution are mixed and compounded according to the volume ratio of 2:1 to obtain the compound polyaluminum ferric chloride flocculating and dephosphorizing agent. Then PAFC and PAM in the compound polyaluminum ferric chloride flocculating and dephosphorizing agent+The mass ratio of the CTS to the CTS is 500:1: 0.5.
In the present invention, PAFC solution and PAM+When the solution and the CTS solution are mixed, the adding sequence of the three solutions has no strict requirement, and the preparation requirements of the invention are met.
Example 2: preparation of composite polyaluminum ferric chloride (marked as cPAFC (chlorinated poly-ferric ammonium fluoride)) flocculation phosphorus removal agent
The present embodiment is different from embodiment 1 in that:
the alkaline solution selected in the first step is NaCO3；
Replacing the solvent acetic acid of the CTS solution with hydrochloric acid in the fifth step;
and a sixth step, preparing the compound polyaluminum ferric chloride flocculating and dephosphorizing agent:subjecting the PAFC-PAM obtained above to+The solution and the CTS solution are mixed and compounded according to the volume ratio of 1:1 to obtain the compound polyaluminum ferric chloride flocculating and dephosphorizing agent. Then PAFC and PAM in the compound polyaluminum ferric chloride flocculating and dephosphorizing agent+The mass ratio of the CTS to the CTS is 500:1: 1.
The rest of the operations in this embodiment are the same as those in embodiment 1, and are not described again here.
Example 3: preparation of composite polyaluminum ferric chloride (marked as cPAFC (phosphate ester fiber reinforced) flocculation phosphorus removal agent
The present embodiment is different from embodiment 1 in that:
the alkaline solution selected in the first step is NaHCO3；
Replacing the solvent acetic acid of the CTS solution with formic acid in the fifth step;
and a sixth step, preparing the compound polyaluminum ferric chloride flocculating and dephosphorizing agent: subjecting the PAFC-PAM obtained above to+The solution and the CTS solution are mixed and compounded according to the volume ratio of 1:2 to obtain the compound polyaluminum ferric chloride flocculating and dephosphorizing agent. Then PAFC and PAM in the compound polyaluminum ferric chloride flocculating and dephosphorizing agent+The mass ratio of the CTS to the CTS is 500:1: 2.
The rest of the operations in this embodiment are the same as those in embodiment 1, and are not described again here.
Example 4: preparing a composite polyaluminum ferric chloride flocculating and dephosphorizing agent:
the present embodiment is different from embodiment 2 in that: the alkaline solution selected in the first step is NaOH and NaCO3The rest of the mixture is the same as that in example 2, and the description thereof is omitted.
Example 5: preparing a composite polyaluminum ferric chloride flocculating and dephosphorizing agent:
this embodiment is different from embodiment 4 in that: in the fifth step, the solvent of the CTS solution is a mixed solution of acetic acid and hydrochloric acid; the rest is the same as embodiment 4, and the description is omitted here.
Example 6: preparation of a flocculating and dephosphorizing agent PAFC (marked as PAFC ②):
the present embodiment differs from embodiment 1 in the first step: to contain AlCl3·6H2O andFeCl3·6H2the NaOH solution was slowly added to the solution A1 of O until the degree of alkalization of the solution A1 was 0.2, and the rest was the same as in the first step of example 1, and thus, the details thereof are not repeated.
Example 7: preparation of PAFC (marked as PAFC (phosphate ester fiber) flocculation phosphorus removal agent):
the present embodiment differs from embodiment 1 in the first step: to contain AlCl3·6H2O and FeCl3·6H2The NaOH solution was slowly added to the solution A1 of O until the degree of alkalization of the solution A1 was 0.3, and the rest was the same as in the first step of example 1, and thus, the details thereof are not repeated.
Example 8: preparation of PAFC (marked as PAFC (r)) flocculation phosphorus removal agent:
the present embodiment differs from embodiment 1 in the first step: to contain AlCl3·6H2O and FeCl3·6H2The NaOH solution was slowly added to the solution A1 of O until the degree of alkalization of the solution A1 was 0.5, and the rest was the same as in the first step of example 1, and thus, the details thereof are not repeated.
Example 9: preparation of PAFC (marked as PAFC (fifth)) flocculating and dephosphorizing agent:
the present embodiment differs from embodiment 1 in the first step: 3.28g of AlCl3·6H2O and 0.91g FeCl3·6H2O was added to a beaker, and 80mL of water was added and stirred at room temperature until completely dissolved to obtain solution A2, which was the same as the first step of example 1 and will not be described herein.
Example 10: preparation of PAFC (marked as PAFC (sixthly)) flocculating and dephosphorizing agent:
the present embodiment is different from embodiment 9 in that: the NaOH solution was slowly added to the solution A2 until the degree of alkalization of the solution A2 was 0.5, and the rest was the same as in example 9, and thus the description thereof is omitted.
Example 11: preparation of PAFC (marked as PAFC:):
the present embodiment is different from embodiment 10 in that: 1.91g of AlCl3·6H2O and 0.91g FeCl3·6H2Adding O into a beaker, adding 80mL of water, stirring at room temperature until the O is completely dissolved to obtain a solution A3, and mixing the rest materialsEmbodiment 10 is the same and will not be described herein.
Example 12: preparation of PAFC (marked as PAFC +) flocculating and dephosphorizing agent:
the present embodiment is different from embodiment 10 in that: 1.23g of AlCl3·6H2O and 0.91g FeCl3·6H2O was added to a beaker, and 80mL of water was added and stirred at room temperature until completely dissolved to obtain solution A4, which was the same as in example 10 and was not repeated here.
The effect of the PAFC flocculation phosphorus removal agent in the embodiment of the invention for removing turbidity and phosphorus is verified as follows:
the PAFC (first step of catalytic reduction) first step and the PAFC (second step of catalytic reduction) second step, the PAFC third step, the PAFC fourth step, the PAFC fifth step, the PAFC sixth step, the PAFC seventh step and the PAFC eighth step, which are respectively prepared in the first step of the embodiment 1 and the embodiments 6 to 12, are utilized to treat the simulated wastewater so as to screen out proper PAFC flocculation phosphorus removing agent for preparing the composite polymeric aluminum ferric chloride flocculation phosphorus removing agent. The simulated wastewater adopts tap water, kaolin and potassium dihydrogen phosphate (KH)2PO4) Formulated, TP (as P) was about 1.0mg/L and turbidity was about 40 NTU.
The method comprises the steps of taking seven beakers, adding 500mL of simulated wastewater into the beakers respectively, and then adding 5mg of PAFC (platelet activating factor), (platelet. And then rapidly stirring (300rpm) for 1min by using a stirrer, slowly stirring (70rpm) for 15min, standing and precipitating for 30min, and taking supernatant liquid 2-3 cm below the liquid surface to measure turbidity and TP. The turbidity and phosphorus removal effects of each PAFC are shown in table 1.
As can be seen from Table 1, the simulated wastewater treated by the PAFC flocculation phosphorus removal agent has the best turbidity removal effect of PAFC (Perfluorooctane number) and the turbidity can be removed by 92.83%, but the phosphorus removal effect is poor, and the TP can be removed by 38.59%. The best phosphorus removal effect is PAFC (polyamide fiber reinforced polymer), and 52.56% of TP can be removed; the turbidity removal effect is also better, and the turbidity can be removed by 91.69%. Comprehensively judging the turbidity and phosphorus removal effect, and preferably selecting the PAFC (polyamide fiber reinforced plastics) to be used for preparing the compound polyaluminum ferric chloride.
TABLE 1 Effect of PAFC on removing turbidity and TP of simulated wastewater
The effect of the composite polyaluminum ferric chloride flocculating and phosphorus removing agent in the embodiment of the invention for removing turbidity and phosphorus is verified as follows:
the cPAF (Central anaerobic Filter), cPAF (Central anaerobic Filter) and cPAF (Central anaerobic Filter) respectively prepared in the embodiments 1, 2 and 3 are used for treating the domestic sewage, so that the turbidity removing and phosphorus removing effects of the composite polyaluminum ferric chloride flocculating and phosphorus removing agent prepared by the invention are proved. In addition, for comparison, the PAFC prepared in the second step of example 1 is used for treating domestic sewage, so that the turbidity removal and phosphorus removal performance of the composite polyaluminum ferric chloride flocculating and phosphorus removing agent prepared by the invention is proved to be superior to that of the PAFC which is independently added.
Domestic sewage was taken from the influent of a municipal sewage plant with an initial turbidity of 147NTU and an initial TP (in terms of P) of 2.30 mg/L.
Taking four beakers, adding 500mL of domestic sewage into each beaker, and then respectively adding 0.8mL of cPAF C (first, cPAF C and cPAF C) prepared in the above examples 1, 2 and 3 and 0.5 mL of PAPFC prepared in the second step of the example 1 into the beakers, so that the concentrations of the PAPCs in the four beakers are all 50 mg/L. And then rapidly stirring (300rpm) for 1min by using a stirrer, slowly stirring (70rpm) for 15min, standing and precipitating for 30min, and taking supernatant liquid 2-3 cm below the liquid surface to measure turbidity and TP. The turbidity and phosphorus removal effects of cPAFC (first), cPAFC (second, third, fourth, and fifth) and PAFC are shown in Table 2.
As can be seen from Table 2, after the domestic sewage is treated by the PAFC flocculation phosphorus removal agent, the turbidity can be removed by 93.7%, the TP can be removed by 70.7%, and the TP of the effluent is 0.68 mg/L. After the domestic sewage is treated by the cPAFC (Central anaerobic baffled reactor), the turbidity can be removed by 94.7%, the TP can be removed by 76.5%, and the TP of the effluent is 0.54 mg/L. After the domestic sewage is treated by cPAFC (carbon fiber reactor), the turbidity can be removed by 95.3 percent, the TP can be removed by 76.1 percent, and the TP of the effluent is 0.55 mg/L. After the domestic sewage is treated by the cPAFC, the turbidity can be removed by 95.9 percent, the TP can be removed by 79.1 percent, and the TP of the effluent is 0.48mg/L, thereby reaching the first-grade A discharge standard. Compared with the PAFC added independently, the turbidity removal rate of the cPAF can be improved by 1 percent, and the phosphorus removal rate can be improved by 5.8 percent; turbidity removal by cPAFC 2The rate can be improved by 1.6 percent, and the phosphorus removal rate can be improved by 5.4 percent; the turbidity removal rate of the cPAFC (phosphate ester fiber reinforced polymer) can be improved by 2.2 percent, and the phosphorus removal rate can be improved by 8.4 percent. Thus, it is shown that PAFC and PAM are used in the present invention+And the compound polyaluminum ferric chloride is mixed and compounded with CTS to form the compound polyaluminum ferric chloride, which can effectively improve the removal of turbidity and TP in domestic sewage. And the effluent TP can reach the first-level A discharge standard under the condition of lower PAFC adding amount.
TABLE 2 Effect of PAFC and cPAF on removing turbidity and TP in domestic wastewater produced in example
The chemical mechanism of the invention is as follows:
PAM+because of self high molecular weight and positive charge, colloid particles with negative charge in water can be unstably aggregated to form large flocs through the action of electric neutralization and then are removed by settlement, and simultaneously, colloid and suspended particles in water are adsorbed on PAM (polyacrylamide) through the action of adsorption and bridging+The long chains form flocs to be removed by sedimentation, and the flocculant has the double functions of coagulation and flocculation. The CTS framework has abundant free amino and hydroxyl, and the coordination adsorption capacity is strong. The amino group in the molecular structure of CTS is protonated in acid medium to present positive electricity, and the colloidal particles with negative electricity in water can be neutralized through electric neutralization, so that the colloidal particles are aggregated to form large particle flocs which are easy to settle. Meanwhile, the CTS forms a long-chain structure after being dissolved in water, can absorb colloidal particles in water and is bridged into a similar net structure, so that flocs are enlarged and then settled and removed. In addition, hydroxyl and amino in the CTS molecules can also generate physicochemical action with corresponding groups of pollutants in water to form stable chelate so as to remove the stable chelate. Therefore, PAFC, PAM+The flocculating performance of the flocculating and dephosphorizing agent can be improved by using the flocculating agent and the CTS in a combined way, the adsorption bridging capacity is enhanced, the sedimentation of floc particles in water can be promoted, fine particles which are not easy to sediment when the PAFC is put alone and phosphorus adsorbed on the fine particles are further removed through the functions of net catching, rolling, sweeping and the like, and the turbidity and phosphorus removing effects on sewage are improved.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown is only one of the embodiments of the present invention, and is not actually limited thereto. Therefore, if the person skilled in the art receives the teaching, it is within the scope of the present invention to design the similar manner and embodiments without departing from the spirit of the invention.
Claims (10)
1. The composite polyaluminum ferric chloride flocculating and dephosphorizing agent is characterized by being formed by mixing polyaluminum ferric chloride, cationic polyacrylamide and chitosan in a mass ratio of 500:1: 0.5-500: 1: 2.
2. The preparation method of the composite polyaluminum ferric chloride flocculating and dephosphorizing agent disclosed by claim 1 is characterized by comprising the following steps:
(1) to contain AlCl3·6H2O and FeCl3·6H2Adding an alkaline solution into the solution A of O until the alkalization degree of the solution A reaches 0.1-0.5, carrying out polymerization reaction, drying and grinding to obtain polyaluminum ferric chloride powder, wherein AlCl is contained in the solution A3·6H2O and FeCl3·6H2The molar mass ratio of O is 9: 1-6: 4; dissolving the polyaluminum ferric chloride powder in water to obtain a polyaluminum ferric chloride solution;
(2) respectively preparing a cationic polyacrylamide solution and a chitosan solution; and mixing the polyaluminum ferric chloride solution, the cationic polyacrylamide solution and the chitosan solution according to the mass ratio of solute polyaluminum ferric chloride, cationic polyacrylamide and chitosan of 500:1: 0.5-500: 1:2 to obtain the composite polyaluminum ferric chloride flocculating and dephosphorizing agent.
3. The method according to claim 2, wherein the polymerization reaction time in the step (1) is 16 to 20 hours.
4. The production method according to claim 2, wherein in the step (1), the polymerization reaction is carried out under room temperature conditions.
5. The method according to claim 4, wherein the room temperature in the step (1) is 20 to 40 ℃.
6. The production method according to claim 2, wherein in the step (1), the drying temperature is 60 ℃.
7. The method according to claim 2, wherein in the step (1), NaOH or NaCO is used as the alkaline solution3And NaHCO3And the like.
8. The method according to claim 2, wherein in the step (2), the solvent of the chitosan solution is a mixture of one or more of acetic acid, hydrochloric acid and formic acid.
9. The preparation method according to any one of claims 2 to 8, wherein in the step (1), AlCl is added3·6H2O and FeCl3·6H2Adding an alkaline solution into the solution A of O until the alkalization degree of the solution A reaches 0.1.
10. The preparation method according to any one of claims 2 to 8, wherein in the step (1), AlCl is contained in the solution A3·6H2O and FeCl3·6H2The molar mass ratio of O is 9: 1.
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