CN106746475B - Composite polymer sludge dewatering flocculant and preparation method thereof - Google Patents
Composite polymer sludge dewatering flocculant and preparation method thereof Download PDFInfo
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- CN106746475B CN106746475B CN201611117503.2A CN201611117503A CN106746475B CN 106746475 B CN106746475 B CN 106746475B CN 201611117503 A CN201611117503 A CN 201611117503A CN 106746475 B CN106746475 B CN 106746475B
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- 239000010802 sludge Substances 0.000 title claims abstract description 227
- 239000002131 composite material Substances 0.000 title claims abstract description 104
- 229920000642 polymer Polymers 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 46
- 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 abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims abstract description 31
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 26
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 22
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 22
- FAGUFWYHJQFNRV-UHFFFAOYSA-N tetraethylenepentamine Chemical compound NCCNCCNCCNCCN FAGUFWYHJQFNRV-UHFFFAOYSA-N 0.000 claims abstract description 22
- 150000002500 ions Chemical class 0.000 claims abstract description 20
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 19
- 150000003973 alkyl amines Chemical class 0.000 claims abstract description 19
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 19
- 239000010452 phosphate Substances 0.000 claims abstract description 19
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 19
- 229920001732 Lignosulfonate Polymers 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 238000003756 stirring Methods 0.000 claims description 22
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 17
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 17
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 8
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000011282 treatment Methods 0.000 abstract description 58
- 230000000694 effects Effects 0.000 abstract description 42
- 208000005156 Dehydration Diseases 0.000 abstract description 32
- 230000018044 dehydration Effects 0.000 abstract description 32
- 238000006297 dehydration reaction Methods 0.000 abstract description 32
- 238000000034 method Methods 0.000 abstract description 32
- 239000010865 sewage Substances 0.000 abstract description 15
- 230000009467 reduction Effects 0.000 abstract description 14
- 239000000126 substance Substances 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 8
- 230000006641 stabilisation Effects 0.000 abstract description 6
- 238000011105 stabilization Methods 0.000 abstract description 6
- 231100000331 toxic Toxicity 0.000 abstract description 6
- 230000002588 toxic effect Effects 0.000 abstract description 6
- 239000010842 industrial wastewater Substances 0.000 abstract description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 230000000295 complement effect Effects 0.000 abstract description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 18
- 239000011790 ferrous sulphate Substances 0.000 description 14
- 235000003891 ferrous sulphate Nutrition 0.000 description 14
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 14
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 14
- 239000012065 filter cake Substances 0.000 description 10
- 238000005189 flocculation Methods 0.000 description 10
- 230000016615 flocculation Effects 0.000 description 10
- 230000003750 conditioning effect Effects 0.000 description 9
- 239000000843 powder Substances 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- 229920005552 sodium lignosulfonate Polymers 0.000 description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229960003237 betaine Drugs 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004332 deodorization Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 239000008394 flocculating agent Substances 0.000 description 3
- 230000007794 irritation Effects 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 229940069328 povidone Drugs 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 231100000419 toxicity Toxicity 0.000 description 3
- 230000001988 toxicity Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 235000011116 calcium hydroxide Nutrition 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- -1 polyferric sulfate Chemical class 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 229920001059 synthetic polymer Polymers 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 229920006037 cross link polymer Polymers 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003995 emulsifying agent Substances 0.000 description 1
- UYMKPFRHYYNDTL-UHFFFAOYSA-N ethenamine Chemical compound NC=C UYMKPFRHYYNDTL-UHFFFAOYSA-N 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000012629 purifying agent Substances 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- NESLWCLHZZISNB-UHFFFAOYSA-M sodium phenolate Chemical compound [Na+].[O-]C1=CC=CC=C1 NESLWCLHZZISNB-UHFFFAOYSA-M 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- FZUJWWOKDIGOKH-UHFFFAOYSA-N sulfuric acid hydrochloride Chemical compound Cl.OS(O)(=O)=O FZUJWWOKDIGOKH-UHFFFAOYSA-N 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000000979 synthetic dye Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004065 wastewater treatment 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- 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
- C02F11/004—Sludge detoxification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
A composite high-molecular sludge dewatering flocculant is prepared from alkylamine polyethenoxy ether phosphate, trimethylglycine, tetraethylenepentamine, heavy metal ion trapping agent, lignosulfonate, polyvinyl pyrrolidone, activated carbon powder, composite high-molecular polymerized ferric sulfate and ethyl acetate. In addition, the invention also relates to a preparation method of the composite polymer sludge dewatering flocculant. The raw materials are compatible, the complementary coordination effect among substances is exerted, so that the specific resistance of the sludge is greatly reduced, the sludge dewatering effect and the reduction effect are improved, toxic and harmful substances and pollutants are effectively removed, the sludge dewatering device is safe and stable, does not have secondary pollution, and the subsequent sludge treatment process is reduced; the method realizes reduction, stabilization, harmlessness and reclamation of the sludge, has one-time addition, simple and convenient operation and small addition amount, and is suitable for the sludge dehydration treatment of urban sewage and industrial wastewater.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a composite polymer sludge dewatering flocculant and a preparation method thereof.
Background
The sludge is the final product of sewage treatment, and along with the continuous and rapid development of the economy of China and the acceleration of the urbanization pace, the sewage treatment scale is gradually enlarged, and the sludge yield is increased. The sludge has complex components, high organic matter content and high pollutant concentration, and contains a large amount of harmful pathogens, heavy metals, microorganisms and organic pollutants. The reduction of the sludge is becoming more and more important, and for the treatment of the sludge, dehydration is the most important pretreatment process, and is a very critical link for reducing the subsequent treatment and disposal cost of the sludge. The sludge has strong hydrophilicity, large specific surface area, large dehydration difficulty and low mechanical dehydration efficiency. The sludge is concentrated and dehydrated to only meet the primary requirement of reduction, and then is subjected to landfill or incineration treatment, so that secondary environmental pollution is easily caused.
At present, in the sludge reduction process, mechanical filter pressing dehydration is generally adopted, and a dehydration flocculant is added to improve the dehydration effect, wherein at present, the dehydration flocculant mainly takes inorganic substances as raw materials or is simply mixed to form the main component, such as quicklime and the like, and the dehydration effect and the removal of harmful pollutants such as heavy metals and the like are not ideal, so that the subsequent sludge recycling treatment is not facilitated.
In a word, if the dehydration effect, reduction, harmlessness and recycling of the sludge are realized, the sludge needs to be conditioned to change the morphological characteristics of solid-phase particles of the sludge before the sludge is dehydrated, the specific resistance of the sludge is reduced, the flocculation effect is enhanced, the operation difficulty is reduced, and the dehydration effect is good; sludge conditioning can be divided into three categories: the chemical conditioning method is simple to operate, low in cost, mature in process and remarkable in effect, and is the most widely applied sludge conditioning method at home and abroad at present, so that the sludge dewatering flocculant serving as an important medicament for the chemical conditioning method becomes a hotspot direction for research and development in the sludge treatment industry in the field of environmental protection technology in recent years.
At present, in the research and preparation of the existing sludge dewatering flocculant, the problems of raw material efficiency selection, environmental protection, cost and the like are only considered, namely the research and preparation of the existing sludge dewatering flocculant by taking the sludge dewatering flocculation effect into consideration, namely the research and preparation of the existing sludge dewatering flocculant by taking the sludge dewatering flocculant into the aspects of reduction, harmlessness, stabilization and resource, such as: the ferrous sulfate or ferric chloride applied to sewage treatment has a common effect when being used for sludge dewatering, the ferrous sulfate is not easy to store and transport, the cost is increased, formaldehyde or phenols and the like have strong toxicity and irritation and are not beneficial to environmental protection, and the lime hydrate or lime powder and the like can increase the amount of sludge which is not convenient to use and is not beneficial to subsequent resource utilization of the sludge during sludge dewatering treatment.
The sludge dewatering flocculant consists of an agent A and an agent B; the agent A comprises ferrous sulfate, a heavy metal catching agent, semi coke, lime powder, alkylamine polyoxyethylene ether phosphate and lignosulfonate; the agent B comprises betaine, tetraethylenepentamine, formaldehyde, ethanol and water. When the sludge dewatering flocculant is used for dewatering sludge, 1-4 parts of agent A and 2-7 parts of agent B are added, and the water content (wt%) of a filter cake is 38-43% after filter pressing and dewatering by a mechanical filter press. However, the sludge dewatering flocculant and the dewatering method thereof need to add the flocculant twice, the operation is troublesome, and the adding amount is high; the adopted raw material ferrous sulfate is conventionally used in the aspect of sewage treatment, but has a common effect on sludge dehydration treatment, and the ferrous sulfate raw material is not easy to store and transport and has higher manufacturing cost; the lime powder not only does not reduce the sludge but also increases the amount of sludge which is inconvenient to utilize, and is not beneficial to the subsequent resource utilization of the sludge; formaldehyde has toxicity, irritation and the like, has potential safety hazards, is not beneficial to environmental protection and the like.
Disclosure of Invention
In order to solve the technical problem that the operation is troublesome due to the fact that the flocculating agent is added twice in the prior art, the invention provides the composite polymer sludge dewatering flocculating agent and the preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme: a composite high-molecular sludge dewatering flocculant is prepared from alkylamine polyethenoxy ether phosphate, trimethylglycine, tetraethylenepentamine, heavy metal ion trapping agent, lignosulfonate, polyvinyl pyrrolidone, activated carbon powder, composite high-molecular polymerized ferric sulfate and ethyl acetate. The composite polymer sludge dewatering flocculant of the invention is added once, and has the advantages of simple use, good dewatering effect and small adding amount.
Polyvinylpyrrolidone (also known as povidone) is a nonionic high molecular surfactant, can be used as a dispersion stabilizer, an emulsifier, a thickener, a leveling agent, a particle size regulator, an anti-redeposition agent, a coagulant, a cosolvent and a detergent in different dispersion systems, is the most distinctive of N-vinyl amide polymers, is researched to obtain the deepest and wide variety of fine chemicals, has relative molecular mass of thousands to more than one million of homopolymer, copolymer and cross-linked polymer series products, and is widely applied due to excellent and unique properties of the products. Especially applied to the raw materials of the sludge dewatering agent, has better effects of sterilization, detoxication, hygroscopicity, dispersibility, solubilization, cohesiveness and the like compared with the raw materials of formaldehyde, phenol and the like, and has the advantages of no corrosion, no stimulation, environmental friendliness and the like.
The composite polymer ferric sulfate salt (such as polyferric sulfate, polyferric sulfate aluminum and polyferric sulfate chloride) is a novel, high-quality and high-efficiency ferric salt inorganic polymer coagulant and high-efficiency purifying agent, has stronger adaptability to the PH value of raw water to be treated, better coagulation effect, dense flocculation alum floc and high settling speed, has obvious effects of turbidity removal, degerming, deodorization, algae removal, decoloration, deoiling, dehydration, removal of COD, BOD and heavy metal ions in water and the like, has obvious effects of degerming, deodorization, removal of COD and heavy metal ions and the like compared with other inorganic flocculants, has excellent purification effect on high-turbidity sewage and is more widely applicable to the wide PH value range of 4-11. Especially applied to the raw materials of sewage sludge treatment agents, compared with ferrous sulfate, ferric chloride and the like adopted by the traditional preparation method, the composite polymer ferric sulfate has the advantages of better sludge dewatering effect, better cost performance and the like, and the cost can be effectively saved by 20-40% compared with the ferrous sulfate under the same condition.
The activated carbon powder has deodorization, desalination, catalytic carrier and strong adsorbability, and is widely applied to sewage and sludge treatment. In the process of treating organic sewage and sludge, some organic matters are difficult to be oxidized and decomposed by microorganisms or a common oxidation method, such as phenol, benzene, petroleum and products thereof, pesticides, synthetic dyes, amine compounds and the like, and after biochemical treatment, the organic matters are difficult to reach the discharge standard with higher discharge requirements, and the recycling of sewage and the subsequent utilization of sludge are also seriously influenced. The activated carbon has large adsorption capacity to organic matters, is widely applied to the advanced treatment of sewage and sludge, and has the following advantages: the treatment degree is high, after the urban sewage is subjected to advanced treatment by using the activated carbon, the BOD can be reduced by 99%, and the TOC can be reduced to 1-3 mg/L; the application range is wide, and the organic matter is effective to most organic matters in the wastewater, including organic matters which are difficult to degrade by microorganisms; the adaptability is strong, the adaptability to the change of water quantity and organic matter load is strong, and stable treatment effect can be obtained; the granular carbon can be regenerated for reuse, and the adsorbed organic matters are burned by energy sources in the regeneration process, so that sludge is not generated; useful substances can be recovered, the phenol-containing wastewater is treated by the active carbon, and the saturated active carbon is regenerated and adsorbed by alkali, so that the sodium phenolate can be recovered. Application in industrial wastewater treatment: many industrial waste water is difficult or impossible to adopt biochemical treatment, when other methods are adopted, some waste water cannot reach the discharge standard, the operation cost is high, the treatment industry is troublesome, and the like, some toxic organic compounds, some heavy metals and compounds thereof, and the like, and the activated carbon has strong adsorption capacity to the substances. Under the same conditions, the effect of the activated carbon powder is improved by 30-40% compared with the traditional preparation method which adopts raw materials such as blue carbon powder, coke powder and the like, and the comprehensive cost is saved by 15-30%.
And the activated carbon powder and the polyvinylpyrrolidone are applied to the sewage and sludge treatment agent by respective unique properties of the activated carbon powder and the polyvinylpyrrolidone, replace slaked lime, lime powder and the like which are commonly adopted in the prior art, have better effects of sterilization and detoxification, moisture absorption and the like, and are more beneficial to realizing the reduction, the harmlessness, the stabilization and the resource of the sludge.
Preferably, the composite polymer sludge dewatering flocculant comprises, by weight, 7-11 parts of alkylamine polyoxyethylene ether phosphate, 17-21 parts of trimethylglycine, 11-15 parts of tetraethylenepentamine, 5-8 parts of a heavy metal ion trapping agent, 5-7 parts of lignosulfonate, 4-8 parts of polyvinylpyrrolidone, 19-25 parts of activated carbon powder, 12-16 parts of composite polymer ferric sulfate and 3-5 parts of ethyl acetate. Compared with the prior art, the composite polymer sludge dewatering flocculant has the advantages that under the condition that the dewatering rate is the same or close to the dewatering rate, the addition amount of the composite polymer sludge dewatering flocculant is less, and the cost is effectively reduced.
In any of the above schemes, preferably, the composite polymer sludge dewatering flocculant comprises, by weight, 8-10 parts of alkylamine polyoxyethylene ether phosphate, 18-20 parts of trimethylglycine, 12-14 parts of tetraethylenepentamine, 6-7 parts of a heavy metal ion trapping agent, 6-7 parts of lignosulfonate, 5-7 parts of polyvinylpyrrolidone, 22-24 parts of activated carbon powder, 13-15 parts of composite polymer ferric sulfate salt and 3-5 parts of ethyl acetate.
In any of the above schemes, preferably, the composite polymer sludge dewatering flocculant comprises, by weight, 9-11 parts of alkylamine polyoxyethylene ether phosphate, 19-21 parts of trimethylglycine, 13-15 parts of tetraethylenepentamine, 6-8 parts of a heavy metal ion trapping agent, 6-7 parts of lignosulfonate, 6-8 parts of polyvinylpyrrolidone, 19-25 parts of activated carbon powder, 14-16 parts of composite polymer ferric sulfate salt and 3-5 parts of ethyl acetate.
In any of the above schemes, preferably, the composite polymeric ferric sulfate salt includes one or more of polymeric ferric sulfate, polymeric ferric aluminum sulfate, and polymeric ferric chloride sulfate.
In any of the above embodiments, preferably, the composite polymeric ferric sulfate salt is composed of two or more of polymeric ferric sulfate, polymeric ferric aluminum sulfate and polymeric ferric chloride sulfate in equal ratio. The term "geometric proportion composition" means that when two or more of the above-mentioned composite polymeric ferric sulfate salts are combined, the portions of each of the above-mentioned composite polymeric ferric sulfate salts are the same, for example, if the added portion of the above-mentioned composite polymeric ferric sulfate salt is 15 portions, the two of them can be mixed and used, and each of them is 7.5 portions; three kinds of the above-mentioned materials can be used together, and each of the above-mentioned materials is 5 portions; of course, two or more of them may be mixed uniformly in the same portion in advance and then added as the whole of the composite polymeric ferric sulfate. The mixed combination of the composite polymer ferric sulfate salt can exert strong effect, has certain market prospect, can be widely applied to various water purification treatments and sewage sludge treatments, and the like, and actually, two or more composite polymer ferric sulfate salts can be mixed in any proportion in different proportions, and the equal proportion mixing is only for simple and convenient operation.
In any of the above schemes, the fineness of the composite polymeric ferric sulfate and the activated carbon powder is preferably less than 300-700 mesh.
The composite polymer sludge dewatering flocculant provided by the invention is added once, is simple to use, has low cost, high removal rate of toxic substances, small sludge increment, good dewatering effect and small adding dosage.
The composite polymer sludge dewatering flocculant provided by the invention is a novel sludge dewatering agent mainly based on synthetic polymer organic matters, and the flocculation performance is enhanced by fully utilizing a composite polymer material. The compatibility of the raw materials, the complementary coordination effect and the chemical reaction of substances are exerted, so that the specific resistance of the sludge is greatly reduced, the sludge dewatering effect and the reduction effect are improved, toxic harmful and polluting substances such as heavy metal ions and the like are effectively removed, toxic monomer residues are avoided, the sludge dewatering agent is safe and stable, secondary pollution is avoided, and the subsequent sludge treatment process is reduced; the method can be widely applied to the dehydration treatment of urban sewage and industrial wastewater sludge, realizes the reduction, stabilization, harmlessness and reclamation of the sludge, and has the advantages of one-time addition, simple and convenient operation and small addition dosage.
In another aspect, the invention further provides a preparation method of the composite polymeric sludge dewatering flocculant, which sequentially comprises the following steps:
the first step is as follows: respectively grinding the raw material composite macromolecular polymeric ferric sulfate and the activated carbon powder, sieving the ground raw material composite macromolecular polymeric ferric sulfate and the activated carbon powder by a sieve with the range of 300-700 meshes, and adding the sieved product into a reactor;
the second step is that: adding alkylamine polyoxyethylene ether phosphate, a heavy metal ion trapping agent and lignosulfonate into the reactor according to the proportion, and mixing and stirring uniformly;
the third step: adding tetraethylenepentamine and ethyl acetate into a reactor, and uniformly stirring;
the fourth step: adding polyvinylpyrrolidone into the reactor, uniformly stirring, and reacting for 2-3 hours;
the fifth step: cooling to room temperature, adding trimethylglycine and gradually adding water, and mixing and stirring; and regulating the water content of the composite polymer sludge dewatering flocculant by controlling the water adding amount and measuring the concentration to obtain the composite polymer sludge dewatering flocculant.
Preferably, the water content of the composite polymeric sludge dewatering flocculant is within 55 percent.
In any of the above embodiments, preferably, in the composite polymeric sludge dewatering flocculant, the total effective content of each raw material is 45% or more.
In any of the above embodiments, preferably, one or more of the stirring steps involved in the preparation method is/are heated to 40-55 ℃ and stirred at a rate of about 100 revolutions per minute.
When sludge is dewatered, the sludge dewatering flocculant provided by the invention is adopted to carry out flocculation conditioning treatment on sludge, and then the sludge is flocculated, so that the dosage of a medicament is small, the flocculation effect is good, the dewatering effect is good, the specific resistance of the sludge is greatly reduced, the sludge dewatering effect and the reduction effect are improved, toxic and harmful substances and pollutants such as heavy metal ions are effectively removed, no toxic and harmful monomer residues exist, the sludge dewatering flocculant is safe and stable, does not have secondary pollution, and the subsequent sludge treatment process is reduced; can be widely applied to the dehydration treatment of urban sewage and industrial wastewater sludge, and realizes the reduction, stabilization, harmlessness and reclamation of the sludge.
Detailed Description
In order to better understand the contents of the present invention, the following further description and explanation are made in conjunction with the specific embodiments.
The raw materials used in the following examples are all commercially available unless otherwise specified, and reference to the weight parts of each raw material or substance means that the effective content of the substance is as high as the stated weight parts.
Example 1
A composite polymer sludge dewatering flocculant is prepared from the following raw materials in parts by weight: 11 parts of alkylamine polyoxyethylene ether phosphate, 17 parts of trimethylglycine, 13 parts of tetraethylenepentamine, 7 parts of heavy metal ion trapping agent, 7 parts of sodium lignosulfonate, 6 parts of polyvinylpyrrolidone, 19 parts of activated carbon powder, 14 parts of polymeric ferric sulfate and 5 parts of ethyl acetate.
The preparation method of the composite polymer sludge dewatering flocculant sequentially comprises the following steps of:
the first step is as follows: respectively grinding 14 parts of polymeric ferric sulfate and 19 parts of activated carbon powder, sieving the ground materials by a sieve with the range of 300-700 meshes, and adding the sieved product into a reactor;
the second step is that: adding 11 parts of alkylamine polyoxyethylene ether phosphate, 7 parts of heavy metal ion trapping agent and 7 parts of sodium lignosulfonate into the reactor, and uniformly mixing and stirring;
the third step: adding 13 parts of tetraethylenepentamine and 5 parts of ethyl acetate into a reactor, and stirring until the tetraethylenepentamine and the ethyl acetate are dissolved;
the fourth step: adding 6 parts of polyvinylpyrrolidone into the reactor, uniformly stirring, and reacting for 2-3 hours;
the fifth step: cooling to room temperature of 26 ℃ for 3 hours, adding trimethylglycine, gradually adding 50-70 parts of water, mixing and stirring; and conditioning the water content of the composite polymer sludge dewatering flocculant to be within 55% by controlling the water adding amount and measuring the concentration to obtain the composite polymer sludge dewatering flocculant. And conditioning the composite polymer sludge dewatering flocculant to ensure that the total effective content of all the raw materials is 45% or more.
The stirring involved in the above method may be carried out under conditions of heating to approximately 35-55 deg.C and stirring at a rate of about 100 revolutions per minute.
The sludge dewatering treatment method by using the composite polymer sludge dewatering flocculant sequentially comprises the following steps:
(1) sludge flocculation conditioning treatment: adding 1 part of the composite polymer sludge dehydration flocculant into original sludge with the water content of about 99 percent by taking the sludge amount as 100 parts; stirring for 10-20 min; conditioning the pH value of the sludge to be neutral (about pH 7) by using 1mol/L sodium hydroxide and hydrochloric acid solution;
(2) sludge flocculation treatment: stirring for 10-20 min to obtain flocculated sludge;
(3) and (3) flocculation sludge dewatering treatment: and carrying out filter pressing dehydration treatment on the flocculated sludge through a mechanical filter press. The pressure of the filter press is generally in the range of 0.3-2.0MPa, and the higher the pressure is, the better the sludge dewatering effect is; specifically, the examples all used a conventional filter press having a pressure of 0.6 MPa.
Alternatively, before the step (1), the composite polymer sludge dewatering flocculant is prepared according to the preparation method of the composite polymer sludge dewatering flocculant and is ready for use.
Through measurement and calculation, the water content of the sludge subjected to dehydration treatment in the embodiment is 48.8%.
In fact, the sodium lignosulfonate can be replaced by potassium lignosulfonate or other lignosulfonates with similar properties, and the dehydration effect is not substantially influenced, but potassium is an element in the fertilizer, so that the subsequent recycling of the fertilizer is facilitated.
Example 2.1
Different from example 1, the above composite polymeric sludge dewatering flocculant was used for sludge dewatering treatment, and 2 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 44.0%.
Example 2.2
Different from example 1, the above composite polymeric sludge dewatering flocculant was used for sludge dewatering treatment, and 3 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 40.6%.
Example 3.1
The composite polymer sludge dewatering flocculant is different from the flocculant in the embodiment 1 in that the flocculant is prepared from the following raw materials in parts by weight: 7 parts of alkylamine polyoxyethylene ether phosphate, 21 parts of trimethylglycine, 13 parts of tetraethylenepentamine, 8 parts of heavy metal ion trapping agent, 5 parts of sodium lignosulfonate, 8 parts of polyvinylpyrrolidone, 21 parts of activated carbon powder, 12 parts of polymeric ferric sulfate and 5 parts of ethyl acetate.
The water content of the filter cake sludge was measured to be 48.5% by the same method.
Example 3.2
Different from example 3.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 2 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 41.3%.
Example 3.3
Different from example 3.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 3 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 37.2%.
Example 4.1
The composite polymer sludge dewatering flocculant is different from the flocculant in the embodiment 1 in that the flocculant is prepared from the following raw materials in parts by weight: 9 parts of alkylamine polyoxyethylene ether phosphate, 19 parts of trimethylglycine, 15 parts of tetraethylenepentamine, 5 parts of heavy metal ion trapping agent, 5 parts of sodium lignosulfonate, 8 parts of polyvinylpyrrolidone, 20 parts of activated carbon powder, 15 parts of polymeric ferric sulfate and 4 parts of ethyl acetate.
The cake sludge moisture content was determined to be 46.9% by the same method.
Example 4.2
Different from example 4.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 2 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 43.1%.
Example 4.3
Different from example 4.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 3 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 39.2%.
Example 5.1
The composite polymer sludge dewatering flocculant is different from the flocculant in the embodiment 1 in that the flocculant is prepared from the following raw materials in parts by weight: 10 parts of alkylamine polyoxyethylene ether phosphate, 18 parts of trimethylglycine, 12 parts of tetraethylenepentamine, 5 parts of heavy metal ion trapping agent, 5 parts of sodium lignosulfonate, 7 parts of polyvinylpyrrolidone, 25 parts of activated carbon powder, 15 parts of polymeric ferric sulfate and 3 parts of ethyl acetate.
The water content of the filter cake sludge was measured to be 47.3% by the same method.
Example 5.2
Different from example 5.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 2 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 37.2%.
Example 5.3
Different from example 5.1, the above composite polymeric sludge dewatering flocculant was used for sludge dewatering treatment, and 3 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge after the dehydration treatment was 32.8%
Example 6.1
The composite polymer sludge dewatering flocculant is different from the flocculant in the embodiment 1 in that the flocculant is prepared from the following raw materials in parts by weight: 8 parts of alkylamine polyoxyethylene ether phosphate, 20 parts of trimethylglycine, 14 parts of tetraethylenepentamine, 5 parts of heavy metal ion trapping agent, 6 parts of sodium lignosulfonate, 7 parts of polyvinylpyrrolidone, 22 parts of activated carbon powder, 14 parts of polymeric ferric sulfate and 4 parts of ethyl acetate.
The water content of the filter cake sludge was measured to be 48.4% by the same method.
Example 6.2
Different from example 6.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 2 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 42.8%.
Example 6.3
Different from example 6.1, the sludge was dewatered by using the above composite polymeric sludge dewatering flocculant, and 3 parts of the composite polymeric sludge dewatering flocculant was added to the sludge, based on 100 parts of the amount of the sludge. The final result showed that the water content of the sludge subjected to the dehydration treatment was 38.6%.
Example 7.1
A composite polymeric sludge dewatering flocculant is different from the flocculant in example 4.1 in that 15 parts of polymeric ferric sulfate is replaced by a mixture of 7.5 parts of polymeric ferric sulfate and 7.5 parts of polymeric ferric aluminum sulfate. The water content of the filter cake sludge was measured to be 43.3% by the same method.
Example 7.2
A composite polymeric sludge dewatering flocculant is different from the flocculant in example 4.1 in that 15 parts of polymeric ferric sulfate is replaced by a mixture of 7.5 parts of polymeric ferric chloride sulfate and 7.5 parts of polymeric ferric aluminum sulfate. The water content of the filter cake sludge was measured to be 41.8% by the same method.
Example 7.3
A composite polymeric sludge dewatering flocculant is different from the flocculant in example 4.1 in that 15 parts of polymeric ferric sulfate is replaced by a mixture of 7.5 parts of polymeric ferric sulfate and 7.5 parts of polymeric ferric sulfate chloride. The water content of the filter cake sludge was determined to be 42.3% by the same method.
Example 7.4
A composite polymeric sludge dewatering flocculant is different from the flocculant in example 4.1 in that 15 parts of polymeric ferric sulfate is replaced by a mixture of 5 parts of polymeric ferric sulfate, 5 parts of polymeric ferric aluminum sulfate and 5 parts of polymeric ferric chloride sulfate. The water content of the filter cake sludge was determined to be 36.2% by the same method.
The test results of the examples show that, especially in examples 5.1 to 5.3, the proportion of the composite polymeric ferric sulfate salt, the activated carbon powder and the povidone is increased preferably within the total amount range of 100 parts, so that the dehydration treatment effect is obviously improved; the composite polymer sludge dewatering flocculant of the invention is a novel sludge dewatering agent mainly comprising synthetic polymer organic matters, and has the characteristics of strong flocculation effect, high sludge dewatering rate, small sludge increment and the like through complementary synergistic effect between compatible medicament components; compared with sludge dewatering flocculant prepared by matching ferrous sulfate, blue carbon powder, slaked lime powder and other raw materials adopted in the traditional technology, the dewatering agent provided by the invention has the advantages of simple operation, small dosage, low cost, good effect and the like, effectively removes toxic substances, is safe and stable, is environment-friendly, has obvious reduction effect and the like, and simultaneously reduces the subsequent sludge resource utilization treatment process and cost.
Comparative example 1
A composite polymer sludge dewatering flocculant is different from the flocculant in the embodiment 1 in that the polyferric sulfate in the composite polymer sludge dewatering flocculant is changed into ferrous sulfate. The sludge is prepared and used for sludge dehydration treatment by the same method, single variable is ensured, and the water content of the sludge in filter cakes is measured to be 56.7 percent by the same method.
Comparative example 2
A composite polymer sludge dewatering flocculant is different from the flocculant in example 1 in that povidone in the flocculant is replaced by formaldehyde. The sludge is prepared and used for sludge dehydration treatment by the same method, single variable is ensured, and the water content of the sludge in a filter cake is measured to be 53.3 percent by the same method.
Comparative example 3
The technical scheme is as follows: the sludge dewatering flocculant consists of an agent A and an agent B; the agent A is prepared from the following raw materials in parts by weight: 28 parts of ferrous sulfate, 10 parts of heavy metal capture agent, 43 parts of semi coke, 12 parts of lime powder, 12 parts of alkylamine polyoxyethylene ether phosphate and 9 parts of lignosulfonate;
the agent B is prepared from the following raw materials in parts by weight: 35 parts of betaine, 20 parts of tetraethylenepentamine, 9 parts of formaldehyde, 9 parts of ethanol and 55 parts of water.
The preparation method of the agent A comprises the steps of grinding ferrous sulfate, semi-coke and lime powder, sieving with a 500-mesh sieve, and then mixing and stirring uniformly with the heavy metal catching agent, alkylamine polyoxyethylene ether phosphate and lignosulfonate.
The preparation method of the agent B comprises the steps of adding tetraethylenepentamine and ethanol into a reaction kettle, stirring until the tetraethylenepentamine is dissolved, heating to 45-50 ℃, stirring at the speed of 100-120 r/min, adding formaldehyde, reacting for 1-2 hours, cooling to room temperature, adding betaine and water, and uniformly stirring.
Sludge dewatering treatment is carried out by adopting the same method as that in the embodiment 1 of the invention, the agent A and the agent B are mixed in advance, the adding amount is also calculated by 100 parts of original sludge, 1 part, 2 parts and 3 parts are respectively added, and the water content of the mud cake is respectively 82.1 percent, 71.7 percent and 65.7 percent by adopting the same method under the same condition; therefore, the sludge dewatering effect is far inferior to that of the composite polymer sludge dewatering flocculant provided by the invention.
Moreover, the 'sludge dewatering flocculant' needs to know the influence of the addition amounts of the agent A and the agent B on the dewatering effect in advance, and meanwhile, the operation is more complicated than the scheme provided by the invention, the flocculant needs to be added twice, the adding amount is large, but the scheme provided by the invention is simple to operate, only needs to be added once, and the adding amount is small.
Moreover, the raw material ferrous sulfate adopted by the sludge dewatering flocculant is commonly used in the aspect of sewage treatment, but the effect of the raw material ferrous sulfate used in the sludge dewatering treatment is poor, and the ferrous sulfate raw material is not easy to store and transport, so that the cost of the raw material is further increased; the lime powder is also used as a raw material, so that the problem of increasing the amount of sludge which is inconvenient to utilize is caused instead of reduction treatment of the sludge, and the subsequent resource treatment and utilization of the sludge are not facilitated; in addition, formaldehyde with toxicity, irritation and other problems is adopted, potential safety hazards, environmental pollution and the like exist in the preparation process and after the formaldehyde is used, and the formaldehyde is not beneficial to environmental protection. In addition, the 'sludge dewatering flocculant' needs to know the influence of the addition amounts of the agent A and the agent B on the dewatering effect in advance, and meanwhile, the operation is more complicated than the scheme provided by the invention, the flocculant needs to be added twice, the adding amount is large, but the scheme provided by the invention is simple to operate, only needs to be added once, and has small adding amount and good dewatering effect; can really realize the reduction, the harmlessness, the stabilization and the resource of the sludge.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the inventive content, which is used for explaining and illustrating the inventive content, and it should be understood that those skilled in the art can make several changes without creative efforts without departing from the general concept of the present invention, and the changes should also fall into the protection scope of the present invention.
Claims (7)
1. A composite polymer sludge dewatering flocculant added at one time is prepared from the following raw materials in parts by weight: 7-11 parts of alkylamine polyoxyethylene ether phosphate, 17-21 parts of trimethylglycine, 11-15 parts of tetraethylenepentamine, 5-8 parts of heavy metal ion trapping agent, 5-7 parts of lignosulfonate, 4-8 parts of polyvinylpyrrolidone, 19-25 parts of activated carbon powder, 12-16 parts of composite high-molecular polymeric ferric sulfate and 3-5 parts of ethyl acetate; the composite high molecular polymeric ferric sulfate comprises one or more of polymeric ferric sulfate, polymeric ferric aluminum sulfate and polymeric ferric chloride sulfate; the composite macromolecular polymeric ferric sulfate salt and the activated carbon powder are undersize materials of a 300-and 700-mesh sieve;
the preparation method of the composite polymer sludge dewatering flocculant sequentially comprises the following steps of:
the first step is as follows: respectively grinding the raw material composite macromolecular polymeric ferric sulfate and the activated carbon powder, sieving the ground raw material composite macromolecular polymeric ferric sulfate and the activated carbon powder by a sieve with 300-mesh and 700-mesh, and adding a product under the sieve into a reactor;
the second step is that: adding alkylamine polyoxyethylene ether phosphate, a heavy metal ion trapping agent and lignosulfonate into the reactor according to the proportion, and mixing and stirring uniformly;
the third step: adding tetraethylenepentamine and ethyl acetate into a reactor, and stirring until the tetraethylenepentamine and the ethyl acetate are dissolved;
the fourth step: adding polyvinylpyrrolidone into the reactor, uniformly stirring, and reacting for 2-3 hours;
the fifth step: cooling to room temperature, adding trimethylglycine and gradually adding water, and mixing and stirring; and regulating the water content of the composite polymer sludge dewatering flocculant by controlling the water adding amount and measuring the concentration to obtain the composite polymer sludge dewatering flocculant.
2. The composite polymeric sludge dewatering flocculant of claim 1, wherein: the composite polymer sludge dewatering flocculant comprises, by weight, 8-10 parts of alkylamine polyoxyethylene ether phosphate, 18-20 parts of trimethylglycine, 12-14 parts of tetraethylenepentamine, 6-7 parts of a heavy metal ion trapping agent, 6-7 parts of lignosulfonate, 5-7 parts of polyvinylpyrrolidone, 22-24 parts of activated carbon powder, 13-15 parts of composite polymer ferric sulfate and 3-5 parts of ethyl acetate.
3. The composite polymeric sludge dewatering flocculant of claim 1, wherein: the composite polymer sludge dewatering flocculant comprises, by weight, 9-11 parts of alkylamine polyoxyethylene ether phosphate, 19-21 parts of trimethylglycine, 13-15 parts of tetraethylenepentamine, 6-8 parts of a heavy metal ion trapping agent, 6-7 parts of lignosulfonate, 6-8 parts of polyvinylpyrrolidone, 19-25 parts of activated carbon powder, 14-16 parts of composite polymer ferric sulfate and 3-5 parts of ethyl acetate.
4. The composite polymeric sludge dewatering flocculant according to any one of claims 1 to 3, wherein: the composite polymer ferric sulfate salt is composed of two or more of polyferric sulfate, polymeric ferric aluminum sulfate and polymeric ferric chloride sulfate in equal weight ratio.
5. The composite polymeric sludge dewatering flocculant of claim 4, wherein: the water content of the composite polymer sludge dewatering flocculant is within 55 percent by weight.
6. The composite polymeric sludge dewatering flocculant of claim 5, wherein: in the composite polymer sludge dewatering flocculant, the effective weight content of each raw material is 45% or more.
7. The composite polymeric sludge dewatering flocculant of claim 6, wherein: one or more of the stirring steps involved in the preparation process are heated to 35-55 deg.C and stirred at 100 revolutions per minute.
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