CN103172251B - Novel chitosan-based sludge dewatering flocculant and preparation method thereof - Google Patents
Novel chitosan-based sludge dewatering flocculant and preparation method thereof Download PDFInfo
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- CN103172251B CN103172251B CN201310140816.XA CN201310140816A CN103172251B CN 103172251 B CN103172251 B CN 103172251B CN 201310140816 A CN201310140816 A CN 201310140816A CN 103172251 B CN103172251 B CN 103172251B
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- 229920001661 Chitosan Polymers 0.000 title claims abstract description 54
- 239000010802 sludge Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000001291 vacuum drying Methods 0.000 claims abstract description 16
- 125000002091 cationic group Chemical group 0.000 claims abstract description 11
- 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 8
- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 7
- 238000001556 precipitation Methods 0.000 claims abstract description 6
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 239000000047 product Substances 0.000 claims description 16
- 238000010792 warming Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 239000003999 initiator Substances 0.000 claims description 7
- 235000019270 ammonium chloride Nutrition 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 239000012265 solid product Substances 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- XMPZTFVPEKAKFH-UHFFFAOYSA-P ceric ammonium nitrate Chemical compound [NH4+].[NH4+].[Ce+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O XMPZTFVPEKAKFH-UHFFFAOYSA-P 0.000 claims description 4
- 239000004160 Ammonium persulphate Substances 0.000 claims description 2
- 239000004159 Potassium persulphate Substances 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 2
- 235000019395 ammonium persulphate Nutrition 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 claims description 2
- 230000016615 flocculation Effects 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 235000019394 potassium persulphate Nutrition 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 abstract 1
- 230000000977 initiatory effect Effects 0.000 abstract 1
- 239000002585 base Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- -1 methylol, hydroxyl Chemical group 0.000 description 5
- 150000002500 ions Chemical class 0.000 description 4
- 229920002401 polyacrylamide Polymers 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 3
- 230000003311 flocculating effect Effects 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000005591 charge neutralization Effects 0.000 description 2
- 238000006757 chemical reactions by type Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- AKYZBROMOQDMIQ-UHFFFAOYSA-N 2-(2-chloropropan-2-yl)-2-propyl-3-tridecyloxirane Chemical compound C(CC)C1(C(C)(C)Cl)C(CCCCCCCCCCCCC)O1 AKYZBROMOQDMIQ-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 108010054033 Chitin deacetylase Proteins 0.000 description 1
- 241000270666 Testudines Species 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 125000005210 alkyl ammonium group Chemical group 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000031709 bromination Effects 0.000 description 1
- 238000005893 bromination reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- GQOKIYDTHHZSCJ-UHFFFAOYSA-M dimethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](C)(C)CC=C GQOKIYDTHHZSCJ-UHFFFAOYSA-M 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a novel chitosan-based sludge dewatering flocculant and a preparation method thereof. The novel chitosan-based sludge dewatering flocculant is characterized by being prepared through the following steps of: dispersing 5-300 parts of modified montmorillonite into 10-500 parts of water to carry out ultrasonic dispersion for 10minutes, ultrasonic power:300W; dissolving 100 parts of hydrophobic cationic chitosan into water to prepare a solution with the concentration of 20-50%, raising the temperature to 40-80 DEG C, introducing N2, adding 0.01-1.5 parts of initiating agent and uniformly stirring; then, dropwise adding 10-50 parts of montmorillonite dispersing solution and reacting for 3-6hours; and cooling the product to the room temperature, cleaning by using an acetone precipitation, and carrying out vacuum drying at 40 DEG C for 6hours to obtain the novel chitosan-based sludge dewatering flocculant.
Description
Technical field
The preparation method who the present invention relates to a kind of chitosan-based Sludge Dewatering Flocculant, belongs to macromolecule material preparation area.
Background technology
Chitosan is chitin deacetylase product, natural, nontoxic, by D-1, and the 4-glycosidic link straight chain superpolymer that is formed by connecting, relative molecular mass is 5 * 10
5～3 * 10
6between, in molecular chain, adjacent six-ring plane has certain angle, and side has methylol, hydroxyl and amido, has determined its good absorption, chelating, crosslinked, bridge formation function, not only to heavy metal ion, there is huge legendary turtle to close adsorption, also electronegative molecule in planar water effectively.Liu Xiaona, Guizhou Normal University's journal (natural science edition), 2011,29(2), Yi Mou city sewage treatment plant residual mud is object, studied the impact of chitosan flocculant on dewatering performance of sludge, the minimum water ratio that can reach mud while adding concentration and be the chitosan solution 6mL of 6g/L in 100mL excess sludge is 70.42%.Zhang Yintang etc.; Shanghai environmental science; 2002; 21(1) studied the application of chitosan flocculant in active sludge conditioning; and compare with polyacrylamide (PAM) flocculation agent and polymerize aluminum chloride (PAC), when chitosan throwing amount (dewatered sludge mass percent) is at 0.8-1.2%, pH value has good conditioning effect when 5-8; substantially suitable with PAM effect, be better than PAC.Chitose-acrylic amide graft copolymerization flocculant is prepared in Chinese invention patent 200810069906.3 researchs of Zheng Huaili, is 94.9%, and is suitable for sludge dewatering to the turbidity removal rate of simulated wastewater.For improving chitosan electric density, impelling the cohesion of mud elimination of colloid stability; Dong Yihua etc.; environmental protection science; 2006; 32(5) by acrylamide, dimethyl diallyl ammonium chloride and chitosan generation graft copolymerization; synthesized the cationic modified polymeric flocculant of chitosan, sludge treatment test shows that its treatment effect is better than PAM, can significantly improve sedimentation and the dewatering of mud.As can be seen here, chitosan and derivative thereof have good application prospect for active sludge conditioning.But it is little in actual applications, because chitosan molecule amount is lower, to build bridge, roll up the effect of sweeping, and consumption is large, thereby has a strong impact on its flocculating effect.
Summary of the invention
The object of this invention is to provide a kind of novel chitosan base Sludge Dewatering Flocculant and preparation method thereof, be characterized in introducing the flexible long branched chain structure of positively charged ion in chitosan molecule, by it, form physics entanglement network structure and make up the defect that chitosan molecule amount is lower, better bring into play surface charge neutralization and bridging and netting effect; Simultaneously that clay absorbent and the cationic chitosan with strong adsorptive power and ion-exchange capacity is compound, employing has the surfactant modified polynite of the cationoid reaction type surface of chain alkyl, strengthen the interface interaction of itself and chitosan molecule and the absorption of dirt in mud, volume are swept to effect, realizing the dehydration of mud efficient flocculating.
Object of the present invention is realized by following technical measures, and wherein said raw material mark, except specified otherwise, is parts by weight.Chitosan-based Sludge Dewatering Flocculant prepare formula constituent be by weight:
Wherein, initiator is any in ceric ammonium nitrate, ammonium persulphate, Potassium Persulphate, sodium bisulfite;
2,3-epoxypropyl dimethyl chain alkyl ammonium chloride molecular formula is:
Acrylyl oxy-ethyl dimethyl chain alkyl brometo de amonio molecular formula is:
The preparation of dewatering cationic chitosan:
In there-necked flask, add 2-10 part chitosan, 20-100 part Virahol, 10-80 part distilled water, be warming up to 35 ℃, swelling 30 minutes; Then be warming up to 60-80 ℃, slowly adding concentration is 2 of 20-50%, 3-epoxypropyl dimethyl chain alkyl aqueous ammonium chloride solution 4-40 part, reaction 6h; Product washing with acetone, in 50 ℃ of vacuum-dryings, obtains light yellow solid product;
The preparation of modified montmorillonoid:
1-5 part sodium-based montmorillonite (Na-MMT) is dispersed in the ethanol/water mixed solution that 100-500 part, volume ratio are 1/1, in 60 ℃, stir 1 hour, then add 0.1-16 part acrylyl oxy-ethyl dimethyl chain alkyl brometo de amonio, continue to stir 3 hours, product is in 60 ℃ of vacuum-dryings;
The preparation of novel chitosan base Sludge Dewatering Flocculant:
5～300 parts of modified montmorillonoids are scattered in 10-500 part water and carry out ultrasonic dispersion 10min, and ultrasonic power is 300W; By 100 parts of water-soluble solution that are mixed with 20-50% concentration of dewatering cationic chitosan, be warming up to 40～80 ℃, logical N
2, add 0.01～1.5 part of initiator, stir; Drip subsequently polynite dispersion soln 10-500 part, react 3～6h; Product is cooled to room temperature, with acetone precipitation washing, in 40 ℃ of vacuum-drying 6h, obtains novel chitosan base Sludge Dewatering Flocculant.
Novel chitosan base Sludge Dewatering Flocculant performance:
Novel chitosan base Sludge Dewatering Flocculant prepared by employing the present invention is for sludge dewatering, and when its consumption is 0.1g/L, resistivity is 5.15 * 10
10cm/g, filter cake moisture content is 83.32%, and supernatant fluid turbidity is 5.3NTU, and the dewatering performance of sludge of more unmodified chitosan is significantly improved.
Tool of the present invention has the following advantages
The present invention calls at a kind of novel chitosan base Sludge Dewatering Flocculant of preparation, has following features:
(1) in chitosan molecule, introduce the flexible long branched chain structure of positively charged ion, by it, form physics entanglement network structure and make up the defect that chitosan molecule amount is lower, to negative charge mud can better bring into play surface charge neutralization and bridging and netting effect;
(2) montmorillonite adsorbent and the cationic chitosan with strong adsorptive power and ion-exchange capacity is compound, employing has the surfactant modified surface of clay of cationoid reaction type of chain alkyl, surfactant molecule is grafted in chitosan molecule, strengthen the interface interaction of clay and chitosan molecule; Its positively charged ion backbone of while also can strengthen it absorption of dirt, volume are swept to effect, thereby realizes the dehydration of mud efficient flocculating.
Embodiment
Below by embodiment, the present invention is specifically described; be necessary to be pointed out that at this present embodiment is only used to further illustrate the present invention; can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field can make some nonessential improvement and adjustment to the present invention according to the content of the invention described above.
Embodiment 1
In there-necked flask, add 110g chitosan, 1250mL Virahol, 1250mL distilled water, be warming up to 35 ℃, swelling 30 minutes; Then be warming up to 60 ℃, slowly add concentration be 30% 2,3-epoxypropyl dimethyl-octa alkyl ammonium chloride aqueous solution 800mL, reaction 6h; Product washing with acetone, in 50 ℃ of vacuum-dryings, obtains light yellow solid product;
20g sodium-based montmorillonite (Na-MMT) is dispersed in the ethanol/water mixed solution that 1000mL, volume ratio are 1/1, in 60 ℃, stir 1 hour, then add 3g acrylyl oxy-ethyl dimethyl dodecyl bromination ammonium, continue to stir 3 hours, product is in 60 ℃ of vacuum-dryings;
10g modified montmorillonoid is scattered in 180mL water and carries out ultrasonic dispersion 10min, and ultrasonic power is 300W; By the water-soluble solution that is mixed with 25% concentration of 100g dewatering cationic chitosan, be warming up to 50 ℃, logical N
2, add initiator 0.06g, stir; Drip subsequently polynite dispersion soln 160mL, reaction 6h; Product is cooled to room temperature, with acetone precipitation washing, in 40 ℃ of vacuum-drying 6h, obtains novel chitosan base Sludge Dewatering Flocculant.
Embodiment 2
In there-necked flask, add 400g chitosan, 4000mL Virahol, 3000mL distilled water, be warming up to 35 ℃, swelling 30 minutes; Then be warming up to 70 ℃, slowly add concentration be 40% 2,3-epoxypropyl dimethyl lauryl ammonium chloride aqueous solution 3500mL, reaction 6h; Product washing with acetone, in 50 ℃ of vacuum-dryings, obtains light yellow solid product;
45g sodium-based montmorillonite (Na-MMT) is dispersed in the ethanol/water mixed solution that 3500mL, volume ratio are 1/1, stirs 1 hour in 60 ℃, then add 8g acrylyl oxy-ethyl dimethyl-octa alkyl brometo de amonio, continue to stir 3 hours, product is in 60 ℃ of vacuum-dryings;
20g modified montmorillonoid is scattered in 400mL water and carries out ultrasonic dispersion 10min, and ultrasonic power is 300W; By the water-soluble solution that is mixed with 40% concentration of 100g dewatering cationic chitosan, be warming up to 70 ℃, logical N
2, add initiator 0.09g, stir; Drip subsequently polynite dispersion soln 300mL, reaction 5h; Product is cooled to room temperature, with acetone precipitation washing, in 40 ℃ of vacuum-drying 6h, obtains novel chitosan base Sludge Dewatering Flocculant.
Embodiment 3
In there-necked flask, add 500g chitosan, 5000mL Virahol, 6000mL distilled water, be warming up to 35 ℃, swelling 30 minutes; Then be warming up to 80 ℃, slowly add concentration be 50% 2,3-epoxypropyl dimethyl cetyl chloride aqueous ammonium 4000mL, reaction 6h; Product washing with acetone, in 50 ℃ of vacuum-dryings, obtains light yellow solid product;
65g sodium-based montmorillonite (Na-MMT) is dispersed in the ethanol/water mixed solution that 5000mL, volume ratio are 1/1, in 60 ℃, stir 1 hour, then add 16g acrylyl oxy-ethyl dimethyl hexadecyl brometo de amonio, continue to stir 3 hours, product is in 60 ℃ of vacuum-dryings;
40g modified montmorillonoid is scattered in 500mL water and carries out ultrasonic dispersion 10min, and ultrasonic power is 300W; By the water-soluble solution that is mixed with 50% concentration of 100g dewatering cationic chitosan, be warming up to 80 ℃, logical N
2, add initiator 1.2g, stir; Drip subsequently polynite dispersion soln 450mL, reaction 4h; Product is cooled to room temperature, with acetone precipitation washing, in 40 ℃ of vacuum-drying 6h, obtains novel chitosan base Sludge Dewatering Flocculant.
Claims (2)
1. a novel chitosan base Sludge Dewatering Flocculant, is characterized in that the raw material of this chitosan-based Sludge Dewatering Flocculant is composed of the following components, is by weight:
Formula constituent prepared by flocculation agent is by weight:
Wherein, initiator is any in ceric ammonium nitrate, ammonium persulphate, Potassium Persulphate, sodium bisulfite;
2,3-epoxypropyl dimethyl chain alkyl ammonium chloride molecular formula is:
Acrylyl oxy-ethyl dimethyl chain alkyl brometo de amonio molecular formula is:
2. the preparation method of novel chitosan base Sludge Dewatering Flocculant as claimed in claim 1, is characterized in that the method comprises the following steps:
The preparation of dewatering cationic chitosan:
In there-necked flask, add 2-10 part chitosan, 20-100 part Virahol, 10-80 part distilled water, be warming up to 35 ℃, swelling 30 minutes; Then be warming up to 60-80 ℃, slowly adding concentration is 2 of 20-50%, 3-epoxypropyl dimethyl chain alkyl aqueous ammonium chloride solution 4-40 part, and reaction 6h, product washing with acetone, in 50 ℃ of vacuum-dryings, obtains light yellow solid product;
The preparation of modified montmorillonoid:
1-5 part sodium-based montmorillonite (Na-MMT) is dispersed in the ethanol/water mixed solution that 100-500 part, volume ratio are 1/1, in 60 ℃, stir 1 hour, then add 0.1-16 part acrylyl oxy-ethyl dimethyl chain alkyl brometo de amonio, continue to stir 3 hours, product is in 60 ℃ of vacuum-dryings;
The preparation of novel chitosan base Sludge Dewatering Flocculant:
5～300 parts of modified montmorillonoids are scattered in 10-500 part water and carry out ultrasonic dispersion 10min, and ultrasonic power is 300W; By 100 parts of water-soluble solution that are mixed with 20-50% concentration of dewatering cationic chitosan, be warming up to 40～80 ℃, logical N
2, add 0.01～1.5 part of initiator, stir; Drip subsequently polynite dispersion soln 10-500 part, react 3～6h; Product is cooled to room temperature, with acetone precipitation washing, in 40 ℃ of vacuum-drying 6h, obtains novel chitosan base Sludge Dewatering Flocculant.
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| CN104310556B (en) * | 2014-11-16 | 2015-09-16 | 张亦彬 | A kind of preparation method and application of multi-effect flocculant |
| CN104310570B (en) * | 2014-11-16 | 2015-09-30 | 宏飞集团有限公司 | A kind of preparation method of oxidizing, flocculating composite water disposal agent and application thereof |
| CN104803569A (en) * | 2015-04-01 | 2015-07-29 | 遵义师范学院 | Method for treating sludge through coupling of electrochemistry and flocculant |
| CN109111080A (en) * | 2018-08-01 | 2019-01-01 | 华南理工大学 | A kind of cation montmorillonite type sludge dehydrating agent and its preparation method and application |
| CN108996885A (en) * | 2018-08-27 | 2018-12-14 | 华南理工大学 | A kind of montmorillonite type oxidized sludge dehydrating agent and its preparation method and application |
| CN114516681A (en) * | 2022-01-21 | 2022-05-20 | 丁金萍 | Composite flocculant for industrial wastewater treatment and preparation method thereof |
| CN114849657B (en) * | 2022-04-27 | 2023-09-29 | 南昌市国昌环保科技有限公司 | Preparation of a high-efficiency amphiphilic chitosan-loaded bentonite adsorbent and its application in coking wastewater |
| CN114805688A (en) * | 2022-05-25 | 2022-07-29 | 重庆交通大学 | A kind of modified flocculant and its preparation method and application |
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