CN119330552B - A sludge treating agent and preparation method thereof - Google Patents
A sludge treating agent and preparation method thereof Download PDFInfo
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- CN119330552B CN119330552B CN202411540893.9A CN202411540893A CN119330552B CN 119330552 B CN119330552 B CN 119330552B CN 202411540893 A CN202411540893 A CN 202411540893A CN 119330552 B CN119330552 B CN 119330552B
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- 239000010802 sludge Substances 0.000 title claims abstract description 177
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 68
- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 150000002500 ions Chemical class 0.000 claims abstract description 59
- 238000001179 sorption measurement Methods 0.000 claims abstract description 42
- 239000000654 additive Substances 0.000 claims abstract description 39
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000006247 magnetic powder Substances 0.000 claims abstract description 23
- 238000004062 sedimentation Methods 0.000 claims abstract description 22
- 230000000996 additive effect Effects 0.000 claims abstract description 21
- 239000000440 bentonite Substances 0.000 claims abstract description 19
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 19
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 19
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims abstract description 7
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 7
- 125000001453 quaternary ammonium group Chemical group 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 73
- 239000000203 mixture Substances 0.000 claims description 40
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 28
- 229920002401 polyacrylamide Polymers 0.000 claims description 28
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 17
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 14
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 14
- 239000001095 magnesium carbonate Substances 0.000 claims description 14
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 14
- 238000000967 suction filtration Methods 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 235000012241 calcium silicate Nutrition 0.000 claims description 10
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 10
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 10
- YSRQRFIVCMIJJE-UHFFFAOYSA-M 2,3-dihydroxypropyl(trimethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC(O)CO YSRQRFIVCMIJJE-UHFFFAOYSA-M 0.000 claims description 8
- JOXIMZWYDAKGHI-UHFFFAOYSA-N p-toluenesulfonic acid Substances CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 5
- WDLRUFUQRNWCPK-UHFFFAOYSA-N Tetraxetan Chemical compound OC(=O)CN1CCN(CC(O)=O)CCN(CC(O)=O)CCN(CC(O)=O)CC1 WDLRUFUQRNWCPK-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 239000004227 calcium gluconate Substances 0.000 claims description 5
- 229960004494 calcium gluconate Drugs 0.000 claims description 5
- 235000013927 calcium gluconate Nutrition 0.000 claims description 5
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000378 calcium silicate Substances 0.000 claims description 5
- NEEHYRZPVYRGPP-UHFFFAOYSA-L calcium;2,3,4,5,6-pentahydroxyhexanoate Chemical compound [Ca+2].OCC(O)C(O)C(O)C(O)C([O-])=O.OCC(O)C(O)C(O)C(O)C([O-])=O NEEHYRZPVYRGPP-UHFFFAOYSA-L 0.000 claims description 5
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000003999 initiator Substances 0.000 claims description 5
- 239000010452 phosphate Substances 0.000 claims description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 5
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- PPQREHKVAOVYBT-UHFFFAOYSA-H dialuminum;tricarbonate Chemical compound [Al+3].[Al+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O PPQREHKVAOVYBT-UHFFFAOYSA-H 0.000 claims description 4
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 3
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 3
- WHQOKFZWSDOTQP-UHFFFAOYSA-N 2,3-dihydroxypropyl 4-aminobenzoate Chemical compound NC1=CC=C(C(=O)OCC(O)CO)C=C1 WHQOKFZWSDOTQP-UHFFFAOYSA-N 0.000 claims description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 2
- 239000005955 Ferric phosphate Substances 0.000 claims description 2
- 229940118662 aluminum carbonate Drugs 0.000 claims description 2
- YALMXYPQBUJUME-UHFFFAOYSA-L calcium chlorate Chemical compound [Ca+2].[O-]Cl(=O)=O.[O-]Cl(=O)=O YALMXYPQBUJUME-UHFFFAOYSA-L 0.000 claims description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 claims description 2
- 229940032958 ferric phosphate Drugs 0.000 claims description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 claims description 2
- 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 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 claims description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 2
- 125000005489 p-toluenesulfonic acid group Chemical group 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 235000019976 tricalcium silicate Nutrition 0.000 claims description 2
- 229910021534 tricalcium silicate Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 54
- 239000000706 filtrate Substances 0.000 abstract description 35
- 239000012065 filter cake Substances 0.000 abstract description 31
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 230000001988 toxicity Effects 0.000 abstract description 3
- 231100000419 toxicity Toxicity 0.000 abstract description 3
- 239000012141 concentrate Substances 0.000 abstract 1
- 125000000623 heterocyclic group Chemical group 0.000 abstract 1
- 229920000592 inorganic polymer Polymers 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000012086 standard solution Substances 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 15
- 238000001035 drying Methods 0.000 description 14
- YLLIGHVCTUPGEH-UHFFFAOYSA-M potassium;ethanol;hydroxide Chemical compound [OH-].[K+].CCO YLLIGHVCTUPGEH-UHFFFAOYSA-M 0.000 description 12
- 238000005303 weighing Methods 0.000 description 12
- AKPUJVVHYUHGKY-UHFFFAOYSA-N hydron;propan-2-ol;chloride Chemical compound Cl.CC(C)O AKPUJVVHYUHGKY-UHFFFAOYSA-N 0.000 description 9
- 238000004448 titration Methods 0.000 description 9
- 239000003513 alkali Substances 0.000 description 6
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000010992 reflux Methods 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 206010003591 Ataxia Diseases 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000011895 specific detection Methods 0.000 description 3
- 238000003828 vacuum filtration Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000003342 alkenyl group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003922 charged colloid Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005886 esterification reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- SZYJELPVAFJOGJ-UHFFFAOYSA-N trimethylamine hydrochloride Chemical group Cl.CN(C)C SZYJELPVAFJOGJ-UHFFFAOYSA-N 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
本发明涉及污泥处理剂技术领域，公开了一种污泥处理剂及其制备方法，该种污泥处理剂包括以下原料：无机高分子絮凝剂、钙盐、碳酸盐、硅酸盐、离子吸附添加料、改性絮凝剂、磁粉；其中，离子吸附添加料是通过对膨润土表面进行修饰，引入四氮杂环结构制备而成；改性絮凝剂是通过将丙烯酰胺与马来酸酐共聚后，引入季铵基团制备而成；通过制备离子吸附添加料与改性絮凝剂参与到污泥处理剂的制备进程中，使得制备出来的污泥处理剂具有优异的絮凝作用，提升对污泥的沉降速率，还能够降低污泥滤液中重金属含量，减轻滤液的毒性，并且将重金属离子集中在滤饼之中，为重金属离子的回收再利用提供可行性。
The invention relates to the technical field of sludge treatment agents, and discloses a sludge treatment agent and a preparation method thereof. The sludge treatment agent comprises the following raw materials: an inorganic polymer flocculant, a calcium salt, a carbonate, a silicate, an ion adsorption additive, a modified flocculant, and magnetic powder; wherein the ion adsorption additive is prepared by modifying the surface of bentonite and introducing a tetranitrogen heterocyclic structure; the modified flocculant is prepared by copolymerizing acrylamide and maleic anhydride and then introducing a quaternary ammonium group; and by preparing the ion adsorption additive and the modified flocculant to participate in the preparation process of the sludge treatment agent, the prepared sludge treatment agent has an excellent flocculation effect, improves the sedimentation rate of the sludge, can also reduce the heavy metal content in the sludge filtrate, reduce the toxicity of the filtrate, and concentrate the heavy metal ions in the filter cake, thereby providing feasibility for the recovery and reuse of the heavy metal ions.
Description
Technical Field
The invention relates to the technical field of sludge treatment agents, and particularly discloses a sludge treatment agent and a preparation method thereof.
Background
Along with the acceleration of the industrialization process and the improvement of the urban level, the discharge amount of the sewage is rapidly increased, a large amount of sludge is generated, the sludge is used as a byproduct of sewage treatment, the components are very complex, a large amount of water is contained, and the sludge contains various organic matters, inorganic matters, microorganisms, heavy metals and other harmful substances, so that the sludge is effectively treated, and becomes an urgent ring in environmental treatment.
The traditional sludge treatment method mainly comprises natural drying, mechanical dehydration, incineration, landfill and other methods, the methods have limitations of different degrees in treatment efficiency, energy consumption, occupied area, secondary pollution control and the like, particularly heavy metal pollution is caused, water pollution is caused by improper treatment, potential threat is formed to the ecological environment, the sludge treatment agent is a treatment agent specially used for improving the properties of sludge, the dehydration performance and sedimentation rate of the sludge can be effectively improved, but with the acceleration of the current urban process, the discharge amount of the sludge is huge, the treatment efficiency of the sludge treatment agent is general, and the absorption capacity for heavy metal ions is limited in most aspects of improving the dehydration performance of the sludge and changing the fluidity of the sludge, so that for the use of the sludge treatment agent, people can generally improve the treatment of the sludge treatment agent, for example, the sludge treatment agent announces a sludge conditioner and a sludge drying treatment method, the sludge treatment agent releases microorganism moisture in the sludge through breaking a broken chain, the cell water which is difficult to remove in the sludge is solved, the heavy metal is absorbed, the heavy metal is chelated by the cell water which is difficult to remove in the sludge is greatly, the absorption function of the heavy metal is not easy to solidify, the heavy metal is stable, and the heavy metal is not easy to solidify and the heavy metal is added into the ecological cement, and the heavy metal is solidified, and the heavy metal is stable, and the heavy metal is used as the heavy metal is stable to the heavy metal is solidified.
Disclosure of Invention
The invention aims to provide a sludge treatment agent and a preparation method thereof, which solve the technical problems that (1) the common sludge treatment agent has common sedimentation velocity, has low sludge treatment efficiency and has dehydration performance to be improved, and (2) the common sludge treatment agent has limited adsorption capacity on heavy metal ions and has higher heavy metal content to influence ecological environment.
The aim of the invention can be achieved by the following technical scheme:
The sludge treatment agent comprises, by weight, 25-50 parts of an inorganic polymeric flocculant, 22-30 parts of a calcium salt, 3-6 parts of carbonate, 4-8 parts of silicate, 12-16 parts of an ion adsorption additive, 80-100 parts of a modified flocculant and 6-8 parts of magnetic powder, wherein the ion adsorption additive is prepared by modifying the surface of bentonite and introducing a tetraazacyclic structure, and the modified flocculant is prepared by copolymerizing acrylamide and maleic anhydride and introducing a quaternary ammonium group.
Further, the inorganic polymeric flocculant is any one of polyaluminum chloride, polyaluminum sulfate, polyaluminum phosphate, polyaluminum ferric sulfate, polyaluminum ferric diacid and polymeric ferric phosphate, the calcium salt is any one of calcium chloride, calcium sulfate, calcium chlorate, calcium gluconate and calcium perchlorate, the carbonate is any one of potassium carbonate, magnesium carbonate, calcium carbonate, sodium carbonate and aluminum carbonate, and the silicate is any one of calcium silicate, silicon dioxide, dicalcium silicate and tricalcium silicate.
Further, the preparation method of the ion adsorption additive comprises the following steps:
and (3) placing bentonite in cyclohexane, performing ultrasonic dispersion for 10-15min, adding 1,4,7, 10-tetraazacyclododecane-1, 4,7, 10-tetraacetic acid, performing heating reaction, performing suction filtration, washing and vacuum drying to obtain the ion adsorption additive.
In the scheme, carboxyl in a 1,4,7, 10-tetraazacyclododecane-1, 4,7, 10-tetraacetic acid structure and hydroxyl on the surface of bentonite are interacted to obtain the ion adsorption additive with the surface coated with the tetraazacyclostructure, the ion adsorption additive takes bentonite as a matrix material and has a larger specific surface area and a layered structure, suspended matters, colloid particles and partial soluble substances in sludge can be effectively adsorbed, the sedimentation efficiency of the sludge particles is accelerated, the moisture content in the sludge is reduced, the dewatering property and the sedimentation property of the sludge are effectively improved, simultaneously, tetranitrogen atoms in the tetraazacyclostructure connected with the surface of the tetraazacyclododecane can form coordination with heavy metal ions which are difficult to sediment in the sludge, the adsorption property of the bentonite and the coordination capability of the tetraazacyclowith the heavy metal ions on the surface of the tetraazacyclois utilized to generate a synergistic effect, the ion adsorption additive is taken as a component part of a sludge treatment agent, the heavy metal ions in the sludge can be effectively adsorbed and sedimentated, the clearance rate of the heavy metal ions in the sludge filtrate is greatly improved, the harm of the heavy metal ions in the sludge filtrate to the environment is reduced, the heavy metal ions are effectively recycled in the filter cake, and the heavy metal ions can be effectively recycled.
Further, the temperature of the heating reaction is 75-85 ℃ and the time is 5-6h.
Further, the preparation method of the modified flocculant comprises the following steps:
s1, placing acrylamide and maleic anhydride in toluene, fully mixing and stirring, adding an initiator, carrying out water bath reaction for 3.5-5h at 70-75 ℃, cooling, discharging, carrying out sedimentation treatment by using a methanol aqueous solution, filtering, washing, and vacuum drying to obtain maleated polyacrylamide;
S2, placing the maleic anhydride polyacrylamide into N, N-dimethylformamide, fully mixing and stirring, introducing nitrogen, adding 2, 3-dihydroxypropyl trimethyl ammonium chloride and a catalyst, heating to 90-95 ℃ for reaction for 3-5h, and collecting a product after the completion of the reaction to obtain the modified flocculant.
In the scheme, under the action of an initiator, allyl in an acrylamide structure and alkenyl in a maleic anhydride structure undergo free radical polymerization reaction to obtain maleinized polyacrylamide, and then under the action of a catalyst, the maleic anhydride group in the maleinized polyacrylamide structure and hydroxyl in a2, 3-dihydroxypropyl trimethyl ammonium chloride structure undergo ring-opening esterification reaction to obtain a modified flocculant, the modified flocculant branched chain contains a plurality of carboxyl groups and quaternary ammonium groups, the carboxyl groups can adsorb heavy metal ions in sludge, and produce synergistic action with ion adsorption additives, so that the content of heavy metal ions in sludge filtrate is reduced, the toxicity of the filtrate is reduced, the quaternary ammonium groups have strong cationic property, the modified flocculant is promoted to carry positive charges in the sludge, electrostatic attraction with negatively charged colloid particles is promoted to flocculate and settle, and the quaternary ammonium groups are on the branched chain of the modified flocculant, through electrostatic action, the contact area of the modified flocculant and the sludge is increased, thereby playing a better flocculation role, and the modified flocculant has a three-dimensional network structure, along with the polymer chains can adsorb heavy metal ions in the sludge, the sludge is improved in the specific effect of the surface area of the modified flocculant, the sludge is improved, the sludge is greatly, the sludge is effectively treated by the effect of the modified flocculant, and the sludge is greatly improved in the effect and the effect-resistance-modifying particle is improved.
Further, in step S1, the initiator is any one of azobisisobutyronitrile and azobisisoheptonitrile.
Further, in step S1, the mass fraction of the aqueous methanol solution is 50-55%.
Further, in step S2, the catalyst is p-toluenesulfonic acid.
The preparation method of the sludge treatment agent comprises the following preparation steps:
Step one, placing an inorganic polymeric flocculant, calcium salt, carbonate, silicate and ion adsorption additives into a mixing stirrer, and stirring for 15-20min to obtain a mixture;
And step two, adding a modified flocculant into the mixture, continuously stirring for 15-25min, adding magnetic powder, and fully stirring for 1-1.5h to obtain the sludge treatment agent.
The invention has the beneficial effects that:
According to the invention, the prepared ion adsorption additive and the modified flocculant participate in the preparation process of the sludge treatment agent, so that the prepared sludge treatment agent has excellent flocculation effect, the sedimentation rate of sludge is effectively improved, the heavy metal content in sludge filtrate can be reduced, the toxicity of the filtrate is lightened, heavy metal ions are concentrated in a filter cake, and feasibility is provided for recycling heavy metal ions.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph of the sedimentation rate of bentonite and ion adsorbing additive of the present invention in a dispersant.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The preparation methods of the ion adsorption additive and the modified flocculant in the following examples and comparative examples of the present invention are as follows:
1. Preparation of ion adsorption additives
5G of bentonite is placed in 120ml of cyclohexane, after ultrasonic dispersion is carried out for 10min, 4.5g of 1,4,7, 10-tetraazacyclododecane-1, 4,7, 10-tetraacetic acid is added, the temperature is increased to 75 ℃, the reaction is carried out for 5h, and the ion adsorption additive is obtained after suction filtration, washing and vacuum drying.
As shown in figure 1, the sedimentation speed of bentonite in toluene is high, sedimentation balance is achieved within 4 hours, the sedimentation speed of the ion adsorption additive is low, sedimentation balance is achieved within 10 hours, which indicates that the dispersion performance of the ion adsorption additive in toluene is better, the sedimentation speed is high due to easy agglomeration of bentonite when the bentonite is dispersed in toluene, and the surface of the ion adsorption additive is modified by organic 1,4,7, 10-tetraazacyclododecane-1, 4,7, 10-tetraacetic acid, so that the sedimentation speed is slow.
2. Preparation of modified flocculant
S1, placing 3g of acrylamide and 2.8g of maleic anhydride in 60ml of toluene, fully mixing and stirring, adding 1g of azodiisobutyronitrile, reacting for 3.5 hours in a 70 ℃ water bath, cooling, discharging, performing sedimentation treatment by using a methanol aqueous solution with the mass fraction of 50%, filtering, washing, and vacuum drying to obtain maleated polyacrylamide;
Measuring the content of maleic anhydride in maleinized polyacrylamide by a titration method, weighing 1g of maleinized polyacrylamide as a sample, adding 60ml of toluene, heating and refluxing for 20min for full mixing, cooling, adding an excessive 0.1mol/L KOH-ethanol standard solution, heating and refluxing for 8h, cooling to room temperature, adding 1ml phenolphthalein indicator, reversely dripping the excessive KOH-ethanol standard solution by using 0.1mol/L HCl-isopropanol standard solution, recording the excessive consumed alkali and the neutralized acid, and calculating the content of maleic anhydride in sample soil according to the following formula, wherein C is the KOH-ethanol standard solution, mol/L, V is the volume of the excessive KOH-ethanol standard solution, ml, C 1 is the HCl-isopropanol standard solution, mol/L, V 1 is the volume of the HCl-isopropanol standard solution consumed in reverse titration and alkali, ml, m is the mass of the sample, and the calculated content of maleic anhydride in the sample soil is 10.28%.
S2, placing 3.8g of maleic anhydride polyacrylamide into 80ml of N, N-dimethylformamide, fully mixing and stirring, introducing nitrogen, adding 3g of 2, 3-dihydroxypropyl trimethyl ammonium chloride and 0.05g of p-toluenesulfonic acid, heating to 90 ℃ for reaction for 3 hours, and collecting a product after the completion of the reaction to obtain the modified flocculant.
The content of maleic anhydride in the modified flocculant is tested by a titration method, the specific method is the same as the step S1, and the content of maleic anhydride in the modified flocculant is calculated to be 2.12%, and the loss is caused in part by the reaction of a maleic anhydride group in a maleinized polyacrylamide structure and a hydroxyl group in a 2, 3-dihydroxypropyl trimethyl ammonium chloride structure.
Examples
Preparation of sludge treatment agent
Step one, placing 25 parts of polyaluminium chloride, 22 parts of calcium chloride, 3 parts of potassium carbonate, 4 parts of calcium silicate and 12 parts of ion adsorption additives into a mixing stirrer, and stirring for 15 minutes to obtain a mixture;
And step two, adding 80 parts of modified flocculant into the mixture, continuously stirring for 15min, adding 6 parts of magnetic powder, and fully stirring for 1h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Firstly, placing 50 parts of polyaluminium phosphate, 30 parts of calcium gluconate, 6 parts of calcium carbonate, 8 parts of dicalcium silicate and 16 parts of ion adsorption additives in a mixing stirrer, and stirring for 20 minutes to obtain a mixture;
And step two, adding 100 parts of modified flocculant into the mixture, continuously stirring for 25min, adding 8 parts of magnetic powder, and fully stirring for 1.5h to obtain the sludge treatment agent.
Comparative example 1
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate and 6 parts of silicon dioxide into a mixing stirrer, and stirring for 18min to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Comparative example 2
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
and step two, adding 90 parts of polyacrylamide into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent, wherein the polyacrylamide is purchased from ataxia Shunyuan chemical industry Co.
Comparative example 3
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of bentonite into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Performance detection
Adding the sludge treatment agent prepared in the examples 1-3 and the comparative examples 1-3 into sludge to be treated as a sample, stirring at a rotating speed of 100r/min for 1h, standing, and testing the water content of a sludge filter cake, the sludge index, the sludge specific resistance and the heavy metal content of filtrate of the sludge treated by the sample after 30min, wherein the mass ratio of the sample to the sludge to be treated is 120:10, and the water content of the sludge to be treated is 85%;
The method comprises the steps of carrying out vacuum suction filtration on sludge after sample treatment to obtain a wet filter cake, putting a clean culture dish into a drying oven to be dried to constant weight, putting the wet filter cake into the drying oven, cooling to room temperature, weighing the mass of an empty culture dish, recording as m (g), putting 100g of the wet filter cake into the empty culture dish, recording as m 1 (g), putting the culture dish with the wet filter cake into the drying oven, baking for 6h, taking out, cooling and weighing, recording as m 2 (g), and calculating the water content of the sludge filter cake according to the following formula, wherein the water content is = (m 1-m2）×100%/（m1 -m);
the method comprises the steps of testing sludge index, namely pouring sludge after sample treatment into a measuring cylinder, standing for 30min to obtain precipitate, reading the volume of the sludge after precipitation in the measuring cylinder, recording as V (ml), taking out a dried culture dish with constant weight, recording the mass as M 0 (g), carrying out vacuum filtration on the sludge after precipitation, taking out a filter cake, putting the filter cake into the culture dish, drying to constant weight, cooling to room temperature, recording the mass as M (g), and calculating the sludge index according to the following formula, wherein the sludge index=V/(M-M 0);
Respectively weighing 100g of sludge subjected to sample treatment, placing the sludge in a measuring cylinder, carrying out suction filtration under the condition of constant air pressure P=0.6 MPa, recording 1 filtrate volume every 10S until a crack appears in a filter cake layer, and calculating the sludge specific resistance according to the following formula, wherein P is filtration pressure (kg.m -2), S is filtration area (m 2), k is the slope of a straight line represented by a filtration equation t/V=bv+a, t is filtration time (S), V is filtrate volume (m 3), n is filtrate dynamic viscosity (kg.s.m -2), and m is dry solid weight (kg.m -3) of filtrate which is filtered per unit volume on a filter medium;
And (3) testing the heavy metal ion content, namely performing reduced pressure suction filtration on sludge to be treated and the sludge treated by the sample by using a Avio and 220 Max atomic absorption spectrophotometer, and respectively testing the heavy metal content in the filtrate, wherein the heavy metal content in the sludge filtrate to be treated is 5769mg/L, the heavy metal content in the sludge filtrate after the sample treatment is recorded as heavy metal content A, and the specific detection results are shown in the following table, wherein the sedimentation rate is slow.
2. Preparation of modified flocculant
S1, placing 3g of acrylamide and 2.8g of maleic anhydride in 60ml of toluene, fully mixing and stirring, adding 1g of azodiisobutyronitrile, reacting for 3.5 hours in a 70 ℃ water bath, cooling, discharging, performing sedimentation treatment by using a methanol aqueous solution with the mass fraction of 50%, filtering, washing, and vacuum drying to obtain maleated polyacrylamide;
Measuring the content of maleic anhydride in maleinized polyacrylamide by a titration method, weighing 1g of maleinized polyacrylamide as a sample, adding 60ml of toluene, heating and refluxing for 20min for full mixing, cooling, adding an excessive 0.1mol/L KOH-ethanol standard solution, heating and refluxing for 8h, cooling to room temperature, adding 1ml phenolphthalein indicator, reversely dripping the excessive KOH-ethanol standard solution by using 0.1mol/L HCl-isopropanol standard solution, recording the excessive consumed alkali and the neutralized acid, and calculating the content of maleic anhydride in sample soil according to the following formula, wherein C is the KOH-ethanol standard solution, mol/L, V is the volume of the excessive KOH-ethanol standard solution, ml, C 1 is the HCl-isopropanol standard solution, mol/L, V 1 is the volume of the HCl-isopropanol standard solution consumed in reverse titration and alkali, ml, m is the mass of the sample, and the calculated content of maleic anhydride in the sample soil is 10.28%.
S2, placing 3.8g of maleic anhydride polyacrylamide into 80ml of N, N-dimethylformamide, fully mixing and stirring, introducing nitrogen, adding 3g of 2, 3-dihydroxypropyl trimethyl ammonium chloride and 0.05g of p-toluenesulfonic acid, heating to 90 ℃ for reaction for 3 hours, and collecting a product after the completion of the reaction to obtain the modified flocculant.
The content of maleic anhydride in the modified flocculant is tested by a titration method, the specific method is the same as the step S1, and the content of maleic anhydride in the modified flocculant is calculated to be 2.12%, and the loss is caused in part by the reaction of a maleic anhydride group in a maleinized polyacrylamide structure and a hydroxyl group in a 2, 3-dihydroxypropyl trimethyl ammonium chloride structure.
Examples
Preparation of sludge treatment agent
Step one, placing 25 parts of polyaluminium chloride, 22 parts of calcium chloride, 3 parts of potassium carbonate, 4 parts of calcium silicate and 12 parts of ion adsorption additives into a mixing stirrer, and stirring for 15 minutes to obtain a mixture;
And step two, adding 80 parts of modified flocculant into the mixture, continuously stirring for 15min, adding 6 parts of magnetic powder, and fully stirring for 1h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Firstly, placing 50 parts of polyaluminium phosphate, 30 parts of calcium gluconate, 6 parts of calcium carbonate, 8 parts of dicalcium silicate and 16 parts of ion adsorption additives in a mixing stirrer, and stirring for 20 minutes to obtain a mixture;
And step two, adding 100 parts of modified flocculant into the mixture, continuously stirring for 25min, adding 8 parts of magnetic powder, and fully stirring for 1.5h to obtain the sludge treatment agent.
Comparative example 1
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate and 6 parts of silicon dioxide into a mixing stirrer, and stirring for 18min to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Comparative example 2
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
and step two, adding 90 parts of polyacrylamide into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent, wherein the polyacrylamide is purchased from ataxia Shunyuan chemical industry Co.
Comparative example 3
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of bentonite into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Performance detection
Adding the sludge treatment agent prepared in the examples 1-3 and the comparative examples 1-3 into sludge to be treated as a sample, stirring at a rotating speed of 100r/min for 1h, standing, and testing the water content of a sludge filter cake, the sludge index, the sludge specific resistance and the heavy metal content of filtrate of the sludge treated by the sample after 30min, wherein the mass ratio of the sample to the sludge to be treated is 120:10, and the water content of the sludge to be treated is 85%;
The method comprises the steps of carrying out vacuum suction filtration on sludge after sample treatment to obtain a wet filter cake, putting a clean culture dish into a drying oven to be dried to constant weight, putting the wet filter cake into the drying oven, cooling to room temperature, weighing the mass of an empty culture dish, recording as m (g), putting 100g of the wet filter cake into the empty culture dish, recording as m 1 (g), putting the culture dish with the wet filter cake into the drying oven, baking for 6h, taking out, cooling and weighing, recording as m 2 (g), and calculating the water content of the sludge filter cake according to the following formula, wherein the water content is = (m 1-m2）×100%/（m1 -m);
the method comprises the steps of testing sludge index, namely pouring sludge after sample treatment into a measuring cylinder, standing for 30min to obtain precipitate, reading the volume of the sludge after precipitation in the measuring cylinder, recording as V (ml), taking out a dried culture dish with constant weight, recording the mass as M 0 (g), carrying out vacuum filtration on the sludge after precipitation, taking out a filter cake, putting the filter cake into the culture dish, drying to constant weight, cooling to room temperature, recording the mass as M (g), and calculating the sludge index according to the following formula, wherein the sludge index=V/(M-M 0);
Respectively weighing 100g of sludge subjected to sample treatment, placing the sludge in a measuring cylinder, carrying out suction filtration under the condition of constant air pressure P=0.6 MPa, recording 1 filtrate volume every 10S until a crack appears in a filter cake layer, and calculating the sludge specific resistance according to the following formula, wherein P is filtration pressure (kg.m -2), S is filtration area (m 2), k is the slope of a straight line represented by a filtration equation t/V=bv+a, t is filtration time (S), V is filtrate volume (m 3), n is filtrate dynamic viscosity (kg.s.m -2), and m is dry solid weight (kg.m -3) of filtrate which is filtered per unit volume on a filter medium;
And (3) testing the heavy metal ion content, namely performing reduced pressure suction filtration on sludge to be treated and the sludge treated by the sample by using a Avio and 220 Max atomic absorption spectrophotometer, and respectively testing the heavy metal content in the filtrate, wherein the heavy metal content in the sludge filtrate to be treated is 5769mg/L, the heavy metal content in the sludge filtrate after the sample treatment is recorded as heavy metal content A, and the specific detection results are shown in the following table, wherein the sedimentation rate is slow.
2. Preparation of modified flocculant
S1, placing 3g of acrylamide and 2.8g of maleic anhydride in 60ml of toluene, fully mixing and stirring, adding 1g of azodiisobutyronitrile, reacting for 3.5 hours in a 70 ℃ water bath, cooling, discharging, performing sedimentation treatment by using a methanol aqueous solution with the mass fraction of 50%, filtering, washing, and vacuum drying to obtain maleated polyacrylamide;
Measuring the content of maleic anhydride in maleinized polyacrylamide by a titration method, weighing 1g of maleinized polyacrylamide as a sample, adding 60ml of toluene, heating and refluxing for 20min for full mixing, cooling, adding an excessive 0.1mol/L KOH-ethanol standard solution, heating and refluxing for 8h, cooling to room temperature, adding 1ml phenolphthalein indicator, reversely dripping the excessive KOH-ethanol standard solution by using 0.1mol/L HCl-isopropanol standard solution, recording the excessive consumed alkali and the neutralized acid, and calculating the content of maleic anhydride in sample soil according to the following formula, wherein C is the KOH-ethanol standard solution, mol/L, V is the volume of the excessive KOH-ethanol standard solution, ml, C 1 is the HCl-isopropanol standard solution, mol/L, V 1 is the volume of the HCl-isopropanol standard solution consumed in reverse titration and alkali, ml, m is the mass of the sample, and the calculated content of maleic anhydride in the sample soil is 10.28%.
S2, placing 3.8g of maleic anhydride polyacrylamide into 80ml of N, N-dimethylformamide, fully mixing and stirring, introducing nitrogen, adding 3g of 2, 3-dihydroxypropyl trimethyl ammonium chloride and 0.05g of p-toluenesulfonic acid, heating to 90 ℃ for reaction for 3 hours, and collecting a product after the completion of the reaction to obtain the modified flocculant.
The content of maleic anhydride in the modified flocculant is tested by a titration method, the specific method is the same as the step S1, and the content of maleic anhydride in the modified flocculant is calculated to be 2.12%, and the loss is caused in part by the reaction of a maleic anhydride group in a maleinized polyacrylamide structure and a hydroxyl group in a 2, 3-dihydroxypropyl trimethyl ammonium chloride structure.
Examples
Preparation of sludge treatment agent
Step one, placing 25 parts of polyaluminium chloride, 22 parts of calcium chloride, 3 parts of potassium carbonate, 4 parts of calcium silicate and 12 parts of ion adsorption additives into a mixing stirrer, and stirring for 15 minutes to obtain a mixture;
And step two, adding 80 parts of modified flocculant into the mixture, continuously stirring for 15min, adding 6 parts of magnetic powder, and fully stirring for 1h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Examples
Preparation of sludge treatment agent
Firstly, placing 50 parts of polyaluminium phosphate, 30 parts of calcium gluconate, 6 parts of calcium carbonate, 8 parts of dicalcium silicate and 16 parts of ion adsorption additives in a mixing stirrer, and stirring for 20 minutes to obtain a mixture;
And step two, adding 100 parts of modified flocculant into the mixture, continuously stirring for 25min, adding 8 parts of magnetic powder, and fully stirring for 1.5h to obtain the sludge treatment agent.
Comparative example 1
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate and 6 parts of silicon dioxide into a mixing stirrer, and stirring for 18min to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Comparative example 2
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of ion adsorption additives into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
and step two, adding 90 parts of polyacrylamide into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent, wherein the polyacrylamide is purchased from ataxia Shunyuan chemical industry Co.
Comparative example 3
Preparation of sludge treatment agent
Step one, placing 40 parts of polyaluminium sulfate, 26 parts of calcium sulfate, 5 parts of magnesium carbonate, 6 parts of silicon dioxide and 14 parts of bentonite into a mixing stirrer, and stirring for 18 minutes to obtain a mixture;
And step two, adding 90 parts of modified flocculant into the mixture, continuously stirring for 20min, adding 7 parts of magnetic powder, and fully stirring for 1.2h to obtain the sludge treatment agent.
Performance detection
Adding the sludge treatment agent prepared in the examples 1-3 and the comparative examples 1-3 into sludge to be treated as a sample, stirring at a rotating speed of 100r/min for 1h, standing, and testing the water content of a sludge filter cake, the sludge index, the sludge specific resistance and the heavy metal content of filtrate of the sludge treated by the sample after 30min, wherein the mass ratio of the sample to the sludge to be treated is 120:10, and the water content of the sludge to be treated is 85%;
The method comprises the steps of carrying out vacuum suction filtration on sludge after sample treatment to obtain a wet filter cake, putting a clean culture dish into a drying oven to be dried to constant weight, putting the wet filter cake into the drying oven, cooling to room temperature, weighing the mass of an empty culture dish, recording as m (g), putting 100g of the wet filter cake into the empty culture dish, recording as m 1 (g), putting the culture dish with the wet filter cake into the drying oven, baking for 6h, taking out, cooling and weighing, recording as m 2 (g), and calculating the water content of the sludge filter cake according to the following formula, wherein the water content is = (m 1-m2）×100%/（m1 -m);
the method comprises the steps of testing sludge index, namely pouring sludge after sample treatment into a measuring cylinder, standing for 30min to obtain precipitate, reading the volume of the sludge after precipitation in the measuring cylinder, recording as V (ml), taking out a dried culture dish with constant weight, recording the mass as M 0 (g), carrying out vacuum filtration on the sludge after precipitation, taking out a filter cake, putting the filter cake into the culture dish, drying to constant weight, cooling to room temperature, recording the mass as M (g), and calculating the sludge index according to the following formula, wherein the sludge index=V/(M-M 0);
Respectively weighing 100g of sludge subjected to sample treatment, placing the sludge in a measuring cylinder, carrying out suction filtration under the condition of constant air pressure P=0.6 MPa, recording 1 filtrate volume every 10S until a crack appears in a filter cake layer, and calculating the sludge specific resistance according to the following formula, wherein P is filtration pressure (kg.m -2), S is filtration area (m 2), k is the slope of a straight line represented by a filtration equation t/V=bv+a, t is filtration time (S), V is filtrate volume (m 3), n is filtrate dynamic viscosity (kg.s.m -2), and m is dry solid weight (kg.m -3) of filtrate which is filtered per unit volume on a filter medium;
and (3) testing the heavy metal ion content, namely carrying out reduced pressure suction filtration on sludge to be treated and sludge treated by a sample by using a Avio-220 Max type atomic absorption spectrophotometer, and respectively testing the heavy metal content in filtrate, wherein the heavy metal content in the sludge filtrate to be treated is 5769mg/L, the heavy metal content in the sludge filtrate after sample treatment is recorded as heavy metal content A, and the specific detection results are shown in the following table:
From the above table, the samples prepared in examples 1-3 all have excellent treatment effects on sludge, the water content, the sludge index and the sludge specific resistance of the treated sludge are all at lower levels, which indicates that the samples have excellent dewatering effects and excellent coagulation sedimentation performance, the content of heavy metal ions in filtrate is greatly reduced after the treated sludge is subjected to reduced pressure suction filtration, the discharge of the filtrate is facilitated, and the heavy metal in filter cakes is increased, so that the recycling of resources can be effectively realized, the samples prepared in comparative example 1 are not added with ion adsorption additives, the treatment capacity for heavy metal ions in the sludge is limited, the samples prepared in comparative example 2 are not added with modified flocculant, polyacrylamide is directly added, the dewatering effect and the coagulation sedimentation performance are not superior to those of the examples, the samples prepared in comparative example 3 are not added with ion adsorption additives, and bentonite with adsorption effect is directly added, so that the bentonite with a certain adsorption capacity for heavy metal ions in filtrate is not superior to that the examples, but the effect is not superior to that the examples are caused by grafting of four nitrogen heterocyclic structures on the surface of bentonite.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely illustrative and explanatory of the principles of the invention, as various modifications and additions may be made to the specific embodiments described, or similar alternatives may be made by those skilled in the art, without departing from the scope of the invention as defined by the principles of the invention.
Claims (3)
1. The sludge treatment agent is characterized by comprising, by weight, 25-50 parts of an inorganic polymeric flocculant, 22-30 parts of a calcium salt, 3-6 parts of carbonate, 4-8 parts of silicate, 12-16 parts of an ion adsorption additive, 80-100 parts of a modified flocculant and 6-8 parts of magnetic powder, wherein the ion adsorption additive is prepared by modifying the surface of bentonite and introducing a tetraazacyclic structure, and the modified flocculant is prepared by copolymerizing acrylamide and maleic anhydride and introducing a quaternary ammonium group;
the preparation method of the modified flocculant is as follows:
s1, placing acrylamide and maleic anhydride in toluene, fully mixing and stirring, adding an initiator, carrying out water bath reaction for 3.5-5h at 70-75 ℃, cooling, discharging, carrying out sedimentation treatment by using a methanol aqueous solution, filtering, washing, and vacuum drying to obtain maleated polyacrylamide;
S2, placing maleic anhydride polyacrylamide into N, N-dimethylformamide, fully mixing and stirring, introducing nitrogen, adding 2, 3-dihydroxypropyl trimethyl ammonium chloride and a catalyst, heating to 90-95 ℃ for reaction for 3-5 hours, and collecting a product after the completion of the reaction to obtain a modified flocculant;
the preparation method of the ion adsorption additive comprises the following steps:
putting bentonite into cyclohexane, performing ultrasonic dispersion for 10-15min, adding 1,4,7, 10-tetraazacyclododecane-1, 4,7, 10-tetraacetic acid, performing heating reaction, performing suction filtration, washing and vacuum drying to obtain an ion adsorption additive;
the initiator is any one of azodiisobutyronitrile and azodiisoheptonitrile;
The inorganic polymeric flocculant is any one of polyaluminium chloride, polyaluminium sulfate, polyaluminium phosphate, polyaluminium ferric sulfate, polyaluminium ferric diacid and polyaluminium ferric phosphate, the calcium salt is any one of calcium chloride, calcium sulfate, calcium chlorate, calcium gluconate and calcium perchlorate, the carbonate is any one of potassium carbonate, magnesium carbonate, calcium carbonate, sodium carbonate and aluminum carbonate, and the silicate is any one of calcium silicate, silicon dioxide, dicalcium silicate and tricalcium silicate;
in the step S1, the mass fraction of the methanol aqueous solution is 50-55%;
in step S2, the catalyst is p-toluenesulfonic acid.
2. A sludge treatment agent as claimed in claim 1, wherein the temperature of the elevated temperature reaction is 75-85 ℃ for a period of 5-6 hours.
3. A method for producing the sludge treatment agent as claimed in claim 1, comprising the steps of:
Step one, placing an inorganic polymeric flocculant, calcium salt, carbonate, silicate and ion adsorption additives into a mixing stirrer, and stirring for 15-20min to obtain a mixture;
And step two, adding a modified flocculant into the mixture, continuously stirring for 15-25min, adding magnetic powder, and fully stirring for 1-1.5h to obtain the sludge treatment agent.
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| CN101003374A (en) * | 2006-11-27 | 2007-07-25 | 浙江大学 | Method for synthesizing composite material of organic - inorganic bentonite |
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| CN111704193A (en) * | 2020-06-30 | 2020-09-25 | 广西夏阳环保科技有限公司 | Composite sewage treatment agent based on modified bentonite and application |
| WO2022110091A1 (en) * | 2020-11-29 | 2022-06-02 | 南京溧水高新创业投资管理有限公司 | Wastewater treatment agent and preparation method therefor |
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| CN101003374A (en) * | 2006-11-27 | 2007-07-25 | 浙江大学 | Method for synthesizing composite material of organic - inorganic bentonite |
| CN102250293A (en) * | 2011-05-25 | 2011-11-23 | 重庆工商大学 | Preparation method and application of acrylamide modified grafted corn cob |
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