CN119841423A - Method for treating sewage by using high-efficiency grafted natural polymer flocculant - Google Patents
Method for treating sewage by using high-efficiency grafted natural polymer flocculant Download PDFInfo
- Publication number
- CN119841423A CN119841423A CN202311343938.9A CN202311343938A CN119841423A CN 119841423 A CN119841423 A CN 119841423A CN 202311343938 A CN202311343938 A CN 202311343938A CN 119841423 A CN119841423 A CN 119841423A
- Authority
- CN
- China
- Prior art keywords
- flocculant
- solution
- cationic
- natural polymer
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
-
- 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
- C02F2303/02—Odour removal or prevention of malodour
-
- 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
- C02F2303/04—Disinfection
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a method for using a high-efficiency grafted natural polymer flocculant for sewage treatment, belonging to the technical field of environmental protection. The flocculant material has the advantages of improving flocculation performance of the material, improving the dissolution performance of natural polymers, being wide in source and low in price, being high in cost performance, being biodegradable, being nontoxic and free of secondary pollution to water, being capable of greatly reducing the pollution risk of acrylamide monomers compared with a polyacrylamide flocculant, being low in dosage, generally being 0.1-0.5mg/L, being applicable to treating water with different charges, having good salt resistance, being wide in using pH range, being applicable in 2-11, and being capable of treating kaolin suspension, humic acid aqueous solution and red iron powder suspension, and being high in pollutant removal rate of water sample after treatment being higher than 98.5%.
Description
Technical Field
The invention relates to a method for using a high-efficiency grafted natural polymer flocculant for sewage treatment, belonging to the technical field of environmental protection.
Background
The effective treatment of sewage has important practical significance for guaranteeing the drinking water safety of people and improving the life quality of people.
Flocculation is an essential step in conventional water treatment. In the process, the selection of the flocculant directly determines the quality of flocculation effect, and is also the key and core foundation of the flocculation water treatment technology. At present, the inorganic flocculant material (mainly aluminum salt and ferric salt) has the advantages of good flocculation effect, relatively low price and the like, and is still the most common flocculant for current water treatment. However, in the use of the flocculant, a trace amount of aluminum ions or iron ions are inevitably remained in the water body, so that the metal ion content in the water body is increased, and if people drink the water for a long time, the health is necessarily damaged, for example, the senile dementia is caused by the deposition of the aluminum ions in the human body. The residual amounts of aluminum and iron ions are well defined in the new standard relative to the old standard. In addition, synthetic organic polymeric flocculants, such as polyacrylamide, have better effects than inorganic flocculants, and are less used, but have higher selling prices, and although the polymer itself is not toxic, monomers which are contained in the polymer and do not participate in the reaction, such as acrylamide, have great toxicity (although the flocculant of the invention also has an acrylamide chain segment, the mass proportion of the added acrylamide in the final flocculant is greatly reduced, and the risk is greatly reduced). Therefore, it is now widely recognized that aluminum salts and polyacrylamides should be used with care in water treatment processes to decontaminate water bodies.
The natural polymer is a macromolecule in animals, plants and microorganism resources in the nature, such as starch, chitin, cellulose, alginic acid and the like, which are easily decomposed into water, carbon dioxide and the like after being abandoned, and has wide sources and no toxicity, thus being an environment-friendly material. In addition, it is more worth mentioning that the natural polymer material is a renewable resource which is completely separated from petroleum resources, so to speak, inexhaustible. Because of the excellent properties, natural polymer materials are widely used in various fields such as biology, medicine and food processing. In addition, the natural polymer has good flocculation effect because a large number of free active groups are distributed on the molecular chain. In fact, natural polymers have been used as water purifying agents as early as in the ancient times, and research into natural polymer flocculants has entered the lag phase due to rapid development of inorganic flocculants and synthetic polymer flocculants. In recent years, as environmental pollution becomes serious, natural polymer materials become one of hot spots for developing current water treatment agents due to the environmental protection characteristics, and are considered as one of the best alternative materials for using inorganic flocculating agents. Since the 70 s of the 20 th century, natural polymeric flocculants have been used in wastewater treatment in countries such as japan, the united states, the united kingdom, and france. Natural polymer resources in China are very rich, but relatively few researches are carried out on the natural polymer resources, and most of the natural polymer resources stay in a laboratory research stage, so that the natural polymer resources are not applied in practice. Nowadays, the government of China pays great attention to the quality of drinking water and publishes and implements new drinking water sanitation standards and industry emission standards, which clearly provides a good opportunity for further development of natural polymeric flocculant.
However, natural polymers have many disadvantages in practical applications, such as the fact that most natural polymers are not charged, chemically inert, poorly soluble, relatively low in molecular weight, and have a narrow pH range. To address these shortcomings, chemical modification methods have been employed to improve performance. Compared with other modified natural polymer materials (such as non-grafted, anionic, cationic and the like), the amphoteric natural polymer has the advantages of greatly improved water solubility, good salt resistance due to the dual characteristics of anionic and cationic groups, and wide application range, and can be used in acidic media and alkaline media. In addition, the amphoteric natural polymer has good complexing effect, can generate complexing effect with transition metal ions, anion/cation electrolytes, humic acid substances, surfactants and the like in water, and can also realize the removal of water-soluble organic pollutants, so that the amphoteric natural polymer flocculant has multiple functions of flocculation, metal ion adsorption, water-soluble organic matter removal and the like, and has great application prospects. In addition, from the cohesive bridging mechanism in the flocculation of the polymeric flocculant, other polymer chains, especially water-soluble polymer chains, are grafted and introduced on the natural polymer main chain, so that the molecular weight of the polymer can be increased, the cohesive bridging flocculation can be enhanced, and the water solubility of the natural polymer can be further improved.
Disclosure of Invention
The invention provides a method for using a high-efficiency grafted natural polymer flocculant for sewage treatment, and the obtained flocculant has good flocculation effect. The high-efficiency grafted amphoteric natural polymer flocculant material not only improves flocculation performance of the material, but also improves dissolution performance of natural polymers, has wide sources and low price, has higher cost performance, has biodegradability and no toxicity per se, does not produce secondary pollution to water, greatly reduces the mass proportion of acrylamide added into the product to the final flocculant compared with polyacrylamide flocculant, greatly reduces pollution risk of acrylamide monomers, has the advantages of good flocculation, metal ion adsorption, bacteriostasis, deodorization, decoloration, effective COD value reduction and the like, has high efficiency, has low adding amount of generally 0.1-0.5mg/L, can be suitable for treating water with different charges, has good salt resistance, has wider pH range, and can be applied in 2-11.
In order to solve the technical problems, the technical scheme is that the method for treating sewage by using the high-efficiency grafted natural polymer flocculant comprises the steps of using the high-efficiency grafted natural polymer flocculant for treating sewage, wherein the flocculant is respectively a kaolin suspension, a humic acid aqueous solution and a hematite powder suspension to be treated, the flocculation effect is optimal when the flocculant dosage is 0.3mg/L, the turbidity removal rate of the water sample is more than 98.5%, the flocculation effect is optimal when the flocculant dosage is 2.5mg/L, the humic acid removal rate of the water sample is more than 98.5%, the turbidity removal rate of the hematite powder suspension is more than 98.5%, the turbidity removal rate of the water sample is higher than 98.5%, the pH=2-10, the turbidity removal rate of the humic acid aqueous solution is higher than 98.5%, the turbidity removal rate of the water sample is higher than 98.11%, and the turbidity removal rate of the water sample is higher than 98.11%;
the structural formula of the high-efficiency grafted natural polymeric flocculant is as follows:
The preparation method of the high-efficiency grafted natural polymeric flocculant comprises the following steps:
Dispersing natural polymers in a sodium hydroxide or potassium hydroxide aqueous solution with the mass percentage concentration of 1-30% (the ratio of the natural polymers to the hydroxide aqueous solution is 1:2-1:5), alkalizing for 0.5-2h, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride with the natural polymers for 0.5-4h at the temperature of 30-80 ℃ in a mass ratio of 0.1:1-3:1, and precipitating and separating by taking ethanol as a precipitator after the reaction is completed to obtain the cationic natural polymers;
And 2, dissolving the cationic natural polymer obtained in the step 1 in water to prepare a solution with the mass percent concentration of 1% -3%, adding a reaction initiator, adding a mixture of acrylamide and sodium allylsulfonate, wherein the addition amount of acrylamide is 1:1-10:1, the addition amount of sodium allylsulfonate is 1:1-10:1, reacting for 1-6 hours at 45-65 ℃, and then precipitating and separating a product by taking ethanol or acetone as a precipitator to prepare the grafted amphoteric natural polymer flocculant.
Preferably, the preparation route of the high-efficiency grafted natural polymeric flocculant is as follows:
Preferably, the substitution degree of the cationic groups in the high-efficiency grafted natural polymer flocculant is 5-99%, the mass of the polyacrylamide is 5-80% of that of the high-efficiency grafted natural polymer flocculant, and the mass of the polyallylsulphonate is 5-70% of that of the high-efficiency grafted natural polymer flocculant.
Preferably, the preparation method of the high-efficiency grafted natural polymer flocculant comprises the steps of dispersing starch (about 15 ten thousand weight average molecular weight of the Shandong coastal gold-gathering corn development limited company) in 5% sodium hydroxide aqueous solution (the ratio of the starch to the sodium hydroxide aqueous solution is 1:4), alkalizing for 1h at 70 ℃, then adding a mixture of trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 2h at 45 ℃ with the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to the starch of 2:1, precipitating and separating by using ethanol as a precipitator after the reaction is finished to obtain cationic starch, dissolving the cationic starch in water to prepare a solution with the mass percent concentration of 1% of the cationic starch, adding ammonium persulfate as an initiator (the mass ratio of the acrylamide to the cationic starch of 2% of the mole number of starch units) after the solution is uniform, adding a mixture of acrylamide (the mass ratio of the cationic starch to the cationic starch of 5:1) and sodium allylsulfonate (the mass ratio of the cationic starch to the starch of 3:1), and reacting for 4 h at 45 ℃, and separating by using the ethanol as the precipitator to obtain the grafted acetone type starch. The degree of substitution by the cationic group was 90%, the content of polyacrylamide was 40% by mass, and the content of sodium polyallylsulphonate was 31% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 21g of grafted amphoteric starch flocculant product is dissolved in 100g of water at 25 ℃.
Preferably, cellulose is dispersed in 1% potassium hydroxide aqueous solution (the ratio of cellulose to sodium hydroxide aqueous solution is 1:5), alkalization is carried out for 2 hours at 20 ℃, then, trimethyl- (3-chloro-2-hydroxy) propylammonium chloride is added, the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propylammonium chloride to the cellulose is 3:1, the reaction is carried out for 0.5 hours at 30 ℃, ethanol is used as a precipitant after the reaction is finished, the cationic cellulose is obtained by precipitation separation, the cationic cellulose is dissolved in water, a solution with the mass percentage concentration of the cationic cellulose being 2% is prepared, ammonium persulfate is added as an initiator (the adding amount is 3% of the mole number of cellulose units) after the solution is uniform, then acrylamide (the mass ratio of the acrylamide to the cationic cellulose is 1:1) and sodium allylsulfonate (the mass ratio of the acrylamide to the cationic cellulose is 8:1) are added, the reaction is carried out for 6 hours at 50 ℃, and then, the precipitation separation product is carried out by using the ethanol as the precipitant, thus obtaining the graft type amphoteric cellulose flocculant. The degree of substitution by the cationic group was 98%, the content of polyacrylamide was 5% by mass, and the content of sodium polyallylsulphonate was 65% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 27g of grafted amphoteric cellulose flocculant product is dissolved in 100g of water at 25 ℃.
Preferably, the flocculant takes kaolin suspension (negative charge), humic acid aqueous solution (negative charge) and red iron powder suspension (positive charge) with different charges as simulated water samples, and the actual flocculation effect of the flocculant is observed through a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm), wherein the flocculation effect of the kaolin suspension is good in the pH=2-9 range when the flocculant dosage is 0.1-0.5mg/L, the turbidity removal rate of the water sample is more than 98.5%, the flocculation effect of the humic acid aqueous solution is good in the pH=3-9 range when the flocculant dosage is 2.0-7.5mg/L, the flocculation effect of the red iron powder suspension is good in the pH=4-11 range when the flocculant dosage is 0.2-1mg/L, and the turbidity removal rate of the water sample is more than 98.5%.
Preferably, the preparation method of the high-efficiency grafted natural polymeric flocculant comprises the steps of dispersing chitin in a 20% potassium hydroxide aqueous solution (the ratio of the chitin to the potassium hydroxide aqueous solution is 1:3), alkalizing for 1h at 40 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 3h at 50 ℃ with the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to the chitin of 0.5:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic chitin, dissolving the cationic chitin in water to prepare a solution with the mass percent concentration of the cationic chitin of 2%, adding cerium ammonium nitrate as an initiator (the added amount is 2% of the mole number of chitin units) after the solution is uniform, adding acrylamide (the mass ratio of the cationic chitin to the cationic sodium sulfonate is 2:1), reacting for 5 h at 60 ℃, and then using acetone as the precipitating agent to obtain the grafted and separated product, namely the grafted amphoteric flocculant. The degree of substitution by the cationic group was 39%, the content of polyacrylamide was 10% by mass, and the content of sodium polyallylsulphonate was 68% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 24g of grafted amphoteric chitin flocculant product is dissolved in 100g of water at 25 ℃.
Preferably, the flocculant takes kaolin suspension (negative charge), humic acid aqueous solution (negative charge) and hematite powder suspension (positive charge) as simulated water samples, and the actual flocculation effect is observed through a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm), wherein the flocculation effect is good when the flocculant dosage is 0.8-2mg/L in the range of pH=2-8, the turbidity removal rate of the water samples is more than 98%, the flocculation effect is good when the flocculant dosage is 3.0-9.5mg/L in the range of pH=3.5-10, the humic acid removal rate of the treated water samples is higher than 98.5%, and the flocculation effect is good when the flocculant dosage is 0.1-0.5mg/L in the range of pH=4-11 and the turbidity removal rate of the water samples is more than 98.5%.
A high-efficiency grafted amphoteric natural polymer flocculant is prepared by graft copolymerizing cationic polymer with acrylamide and sodium allylsulfonate,
The grafted amphoteric natural polymer flocculant comprises starch, cellulose and chitin, wherein the cationic natural polymer is obtained by reacting natural polymer with trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, and the natural polymer can be a commercially available natural polymer material.
According to the method for preparing the grafted amphoteric natural polymer flocculant, the initiator is cerium ammonium nitrate or ammonium persulfate, and the mole number of the initiator is 1-3% of that of the natural polymer unit.
The beneficial effects are that:
The grafted amphoteric natural polymer flocculant material prepared by the preparation method has the triple characteristics of cationic groups, polyacrylamide and polyallylsulphonate, the three materials are linked through chemical bonds, the natural high molecular weight is improved, the water solubility of the natural high polymer is improved, the bonding and bridging flocculation effect is enhanced, in addition, the cationic groups have positive charges, the carboxyl groups on the polyallylsulphonate chain have negative charges, the grafted amphoteric natural polymer flocculant material is suitable for treating water bodies with different charges, has good salt resistance, and has wider application range, can be used in acidic media and alkaline media, and has wide applicable pH value range. Moreover, the natural polymer is a natural biodegradable material, so the material has the characteristics of no toxicity, no secondary pollution and the like.
The preparation method of the grafted amphoteric natural polymer flocculant material is simple to operate, can be prepared at one time by a continuous feeding method, adopts natural polymer products with abundant sources as main raw materials, is suitable for large-scale industrial production, and is an economic preparation method for obtaining a high-quality water treatment agent.
(1) The high-efficiency grafted amphoteric natural polymer flocculant material has amphoteric characteristics because the molecular chain is rich in anionic and cationic groups, so that the flocculation performance of the material is improved, and the dissolution performance of natural polymers is also improved;
(2) The high molecular material has wide sources and low cost, and the grafted amphoteric natural high molecular flocculant material has higher cost performance;
(3) The natural polymer has biodegradability, is nontoxic and does not produce secondary pollution to the water body;
(4) Compared with a polyacrylamide flocculant, the mass proportion of acrylamide added into the product of the invention to the final flocculant is greatly reduced, and the pollution risk of an acrylamide monomer is greatly reduced;
(5) The product has the functions of good flocculation, metal ion adsorption, bacteriostasis, deodorization, decoloration, effective reduction of COD value and the like;
(6) The product has the characteristics of high efficiency, low dosage of generally 0.1-0.5mg/L, suitability for treating water bodies with different charges, good salt resistance, wide use pH range and application in 1-12, and the removal rate of water sample pollutants after treatment is higher than 98.5 percent when the product is used for treating kaolin suspension, humic acid aqueous solution and red iron powder suspension.
(7) The product can be suitable for treating water bodies with different charges, has good salt resistance, has wider pH range, and can be applied in 2-11.
Drawings
FIG. 1 is an infrared spectrum of (1) starch, (2) cationic starch, and (3) grafted amphoteric starch flocculant materials.
FIG. 2 is a schematic representation of the flocculation effect of a grafted amphoteric starch flocculant material on a negatively charged kaolin suspension.
FIG. 3 is a schematic representation of the flocculation effect of grafted amphoteric starch flocculant material on an aqueous solution of humic acid bearing a negative charge.
FIG. 4 is a schematic representation of flocculation effect of grafted amphoteric starch flocculant material on a positively charged red iron powder suspension.
FIG. 5 is a schematic illustration of the effect of water pH on flocculation performance of grafted amphoteric starch flocculant materials.
Detailed Description
The invention is further illustrated by the following examples. It should be understood that these examples are illustrative and exemplary of the present invention and are not intended to limit the scope of the present invention in any way.
Example 1:
Dispersing starch (about 15 ten thousand weight average molecular weight) in 5% sodium hydroxide aqueous solution (the ratio of the starch to the sodium hydroxide aqueous solution is 1:4), alkalizing for 1h at 70 ℃, then adding a mixture of trimethyl- (3-chloro-2-hydroxy) propylammonium chloride, the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propylammonium chloride to the starch is 2:1, reacting for 2h at 70 ℃, using ethanol as a precipitator after the reaction is finished, precipitating and separating to obtain cationic starch, dissolving the cationic starch in water, preparing a solution with the mass percent concentration of the cationic starch of 1%, adding ammonium persulfate as an initiator (the adding amount is 2% of the unit mole number of the starch) after the solution is uniform, adding a mixture of acrylamide (the mass ratio of the acrylamide to the cationic starch is 5:1) and sodium allylsulfonate (the mass ratio of the cationic starch is 3:1), reacting for 4 h at 45 ℃, and then using acetone as the precipitator to precipitate and separating the product to obtain the grafted amphoteric starch flocculant.
The preparation route of the high-efficiency grafted natural polymeric flocculant is as follows:
the degree of substitution by the cationic group was 90%, the content of polyacrylamide was 40% by mass, and the content of sodium polyallylsulphonate was 31% by mass, as analyzed by the nuclear magnetic method.
The infrared spectrograms of the starch, the cationic starch and the grafted amphoteric starch flocculant material are shown in figure 1, the wave number is about 3270cm -1, which is the characteristic absorption peak of O-H, the wave number is about 1477cm -1, which is the characteristic absorption peak of quaternary ammonium salt cationic groups, so that the cationic starch is proved to be successfully prepared, and the amide stretching vibration peak about 1660cm -1 and the sulfonate stretching vibration peak about 1554cm -1 are further used for further explaining that polyacrylamide and polyallylsulfonic acid sodium are grafted on a starch molecular skeleton.
The solubility experiment shows that the maximum solubility is that 21g of grafted amphoteric starch flocculant product is dissolved in 100g of water at 25 ℃.
The flocculant is respectively prepared by taking kaolin suspension (negative charge), humic acid aqueous solution (negative charge) and red iron powder suspension (positive charge) with different charges as simulated water samples, and observing the actual flocculation effect of the kaolin suspension and red iron powder suspension by a spectrophotometer (wavelength 630 nm) when the pH value is 7, and observing the actual flocculation effect of the humic acid aqueous solution by an ultraviolet spectrophotometer (wavelength 254 nm). Fig. 2,3 and 4 are graphs showing the actual flocculation effect of the flocculant by using a kaolin suspension, a humic acid aqueous solution and a hematite powder suspension as simulated water samples. From the graph, the flocculation effect is optimal when the flocculant is used at 0.3mg/L, the turbidity removal rate of a water sample is more than 98.5%, the flocculation effect is optimal when the flocculant is used at 2.5mg/L, the humic acid removal rate of the water sample is higher than 98.5%, and the flocculation effect is optimal when the flocculant is used at 0.4mg/L, the turbidity removal rate of the water sample is more than 98.5%. The sample kaolin and hematite powder without flocculant has a removal rate of about 20% and humic acid removal rate of 0.
In addition, the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm) in the ph=1 to 13 range using a kaolin suspension, a humic acid aqueous solution and a hematite powder suspension as simulated water samples, respectively. As shown in fig. 5, the turbidity removal rate of the water sample after treatment is higher than 98.5% for the kaolin suspension in the range of ph=2-10, higher than 98.5% for the humic acid aqueous solution in the range of ph=2-10, and higher than 98.5% for the hematite powder suspension in the range of ph=3-11.
Example 2:
Dispersing cellulose in 1% potassium hydroxide aqueous solution (the ratio of cellulose to sodium hydroxide aqueous solution is 1:5), alkalizing for 2h at 20 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 0.5h at 30 ℃ with the mass ratio of trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to cellulose being 3:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic cellulose, dissolving the cationic cellulose in water to prepare a solution with the mass percent concentration of the cationic cellulose being 2%, adding ammonium persulfate as an initiator (the adding amount is 3% of the mole number of cellulose units) after the solution is uniform, adding acrylamide (the mass ratio of the acrylamide to the cationic cellulose is 1:1) and sodium allylsulfonate (the mass ratio of the acrylamide to the cationic cellulose is 8:1), reacting for 6h at 50 ℃, and precipitating and separating the product by using ethanol as a precipitating agent to obtain the grafted amphoteric cellulose. The degree of substitution by the cationic group was 98%, the content of polyacrylamide was 5% by mass, and the content of sodium polyallylsulphonate was 65% by mass, as analyzed by the nuclear magnetic method.
The solubility experiment shows that the maximum solubility is that 27g of grafted amphoteric cellulose flocculant product is dissolved in 100g of water at 25 ℃.
The flocculant takes kaolin suspension (negative charge), humic acid aqueous solution (negative charge) and hematite powder suspension (positive charge) with different charges as simulated water samples, and the actual flocculation effect is observed through a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the dosage of the flocculating agent is 0.1-0.5mg/L in the range of pH=2-9, the turbidity removal rate of a water sample is more than 98.5%, the flocculation effect is good when the dosage of the flocculating agent is 2.0-7.5mg/L in the range of pH=3-9, the humic acid removal rate of the water sample after treatment is higher than 98.5%, and the flocculation effect is good when the dosage of the flocculating agent is 0.2-1mg/L in the range of pH=4-11 in the treated water sample, and the turbidity removal rate of the water sample is more than 98.5%.
Example 3:
Dispersing starch in 15% sodium hydroxide aqueous solution (the ratio of the starch to the sodium hydroxide aqueous solution is 1:3.5), alkalizing for 2 hours at 40 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 4 hours at 45 ℃ with the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to the starch being 1.5:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished, obtaining cationic starch, dissolving the cationic starch in water, preparing a solution with the mass percent concentration of the cationic starch being 3%, adding cerium ammonium nitrate as an initiator (the adding amount is 1% of the mole number of starch units) after the solution is uniform, adding acrylamide (the mass ratio of the cerium ammonium nitrate to the cationic starch is 3:1), and sodium allylsulfonate (the mass ratio of the cerium ammonium nitrate to the cationic starch is 6:1), reacting for 3 hours at 60 ℃, and precipitating and separating the product by using acetone as the precipitating agent, thus obtaining the grafted amphoteric starch flocculant. The degree of substitution by the cationic group was 55%, the content of polyacrylamide was 26% by mass, and the content of sodium polyallylsulfonate was 51% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 20g of grafted amphoteric starch flocculant product is dissolved in 100g of water at 25 ℃. The flocculant was used as a simulated water sample from a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a hematite powder suspension (positive charge), and the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the dosage of the flocculant is 0.4-1.5mg/L in the range of pH=2-8, the turbidity removal rate of a water sample is more than 98.5%, the flocculation effect is good when the dosage of the flocculant is 3.0-8.5mg/L in the range of pH=2-9, the humic acid removal rate of the treated water sample is higher than 98.5%, and the flocculation effect is good when the dosage of the flocculant is 0.3-1.2mg/L in the range of pH=4-11 in the treated water sample and the turbidity removal rate of the water sample is more than 98.5% in the range of pH=2-9.
Example 4:
Dispersing chitin in 20% potassium hydroxide water solution (the ratio of chitin to potassium hydroxide water solution is 1:3), alkalizing for 1h at 40 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 3h at 50 ℃ with the mass ratio of trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to chitin of 0.5:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic chitin, dissolving the cationic chitin in water to prepare a solution with the mass percent concentration of the cationic chitin of 2%, adding cerium ammonium nitrate as an initiator (the adding amount is 2% of the mole number of chitin units) after the solution is uniform, adding acrylamide (the mass ratio of the cationic chitin to the cationic flocculant is 2:1) and sodium allylsulfonate (the mass ratio of the cationic chitin to the cationic flocculant is 10:1), reacting for 5h at 60 ℃, and precipitating and separating the product by using acetone as a precipitating agent to obtain the grafted amphoteric chitin. The degree of substitution by the cationic group was 39%, the content of polyacrylamide was 10% by mass, and the content of sodium polyallylsulphonate was 68% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 24g of grafted amphoteric chitin flocculant product is dissolved in 100g of water at 25 ℃. The flocculant was used as a simulated water sample from a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a hematite powder suspension (positive charge), and the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the flocculant is used in the range of pH=2-8 and the turbidity removal rate of a water sample is more than 98% when the flocculant is used in the range of 0.8-2mg/L, the flocculation effect is good when the flocculant is used in the range of pH=3.5-10 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 3.0-9.5mg/L, and the flocculation effect is good when the flocculant is used in the range of pH=4-11 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 0.1-0.5mg/L for the red iron powder suspension.
Example 5:
Dispersing cellulose in 30% potassium hydroxide aqueous solution (the ratio of cellulose to potassium hydroxide aqueous solution is 1:2), alkalizing for 0.5h at 50 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 4h at 80 ℃ with the mass ratio of trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to cellulose of 0.1:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic cellulose, dissolving the cationic cellulose in water to prepare a solution with the mass percent concentration of the cationic cellulose of 3%, adding cerium ammonium nitrate as an initiator (the adding amount is 3% of the mole number of cellulose units) after the solution is uniform, adding acrylamide (the mass ratio of the acrylamide to the cationic cellulose of 10:1) and sodium allylsulfonate (the mass ratio of the acrylamide to the cationic cellulose of 1:1), reacting for 2 h at 65 ℃, and separating the product by precipitation by using ethanol as the precipitating agent to obtain the grafted amphoteric cellulose flocculant. The degree of substitution by the cationic group was 5%, the content of polyacrylamide was 79% by mass, and the content of sodium polyallylsulfonate was 5% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 14g of grafted amphoteric cellulose flocculant product is dissolved in 100g of water at 25 ℃. The flocculant was used as a simulated water sample from a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a hematite powder suspension (positive charge), and the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the flocculant is used in the range of pH=2-8 and the turbidity removal rate of a water sample is more than 98.5%, the flocculation effect is good when the flocculant is used in the range of pH=3-10 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 3.0-7.5mg/L, and the flocculation effect is good when the flocculant is used in the range of pH=5-11 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 1.2-8mg/L for the red iron powder suspension.
Example 6:
Dispersing starch in 25% sodium hydroxide aqueous solution (the ratio of the starch to the sodium hydroxide aqueous solution is 1:2.5), alkalizing for 1.5 hours at 30 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 1 hour at 40 ℃ with the mass ratio of the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to the starch being 2.5:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic starch, dissolving the cationic starch in water to prepare a solution with the mass percent concentration of the cationic starch being 1%, adding ammonium persulfate as an initiator (the adding amount is 1% of the mole number of starch units) after the solution is uniform, adding acrylamide (the mass ratio of the acrylamide to the cationic starch is 6:1), and sodium allylsulfonate (the mass ratio of the acrylamide to the cationic starch is 2:1), and precipitating and separating the product by using acetone as the precipitating agent to obtain the grafted amphoteric starch flocculant. The degree of substitution by the cationic group was 95%, the content of polyacrylamide was 44% by mass, and the content of sodium polyallylsulphonate was 19% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 23g of grafted amphoteric starch flocculant product is dissolved in 100g of water at 25 ℃. The flocculant was used as a simulated water sample from a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a hematite powder suspension (positive charge), and the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the flocculant is used in the range of pH=2-9 and the turbidity removal rate of a water sample is more than 98% when the flocculant is used in the range of 0.2-1mg/L, the flocculation effect is good when the flocculant is used in the range of pH=3-9 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 2.5-8.5mg/L, and the flocculation effect is good when the flocculant is used in the range of pH=5-11 and the turbidity removal rate of the water sample is more than 98.5% when the flocculant is used in the range of 0.6-3mg/L for the red iron powder suspension.
Example 7:
Dispersing chitin in 10% potassium hydroxide water solution (the ratio of chitin to sodium hydroxide water solution is 1:4), alkalizing for 1.5h at 60 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting for 1h at 60 ℃ with the mass ratio of trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride to chitin at 1:1, precipitating and separating by using ethanol as a precipitating agent after the reaction is finished to obtain cationic chitin, dissolving the cationic chitin in water to prepare a solution with the mass percent concentration of the cationic chitin of 1%, adding ammonium persulfate as an initiator (the adding amount is 1% of the mole number of chitin units after the solution is uniform, adding acrylamide (the mass ratio of the ammonium persulfate to the cationic chitin is 8:1) and sodium allylsulfonate (the mass ratio of the ammonium sulfate to the cationic chitin is 5:1), and precipitating and separating the product by using ethanol as the precipitating agent to obtain the grafted amphoteric chitin flocculant. The degree of substitution by the cationic group was 68%, the content of polyacrylamide was 51% by mass, and the content of sodium polyallylsulphonate was 32% by mass, as analyzed by the nuclear magnetic method. The solubility experiment shows that the maximum solubility is that 20g of grafted amphoteric chitin flocculant product is dissolved in 100g of water at 25 ℃. The flocculant was used as a simulated water sample from a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a hematite powder suspension (positive charge), and the actual flocculation effect was observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm). The method has the advantages that the flocculation effect is good when the dosage of the flocculant is 0.3-1.8mg/L in the range of pH=2-8, the turbidity removal rate of a water sample is more than 98.5%, the flocculation effect is good when the dosage of the flocculant is 2.0-8.5mg/L in the range of pH=4-10, the humic acid removal rate of the treated water sample is higher than 98.5%, and the flocculation effect is good when the dosage of the flocculant is 0.4-1.2mg/L in the range of pH=4-11 in the treated water sample and the turbidity removal rate of the water sample is more than 98.5% in the range of pH=4-10.
The invention is not limited to the specific technical scheme described in the above embodiments, and all technical schemes formed by adopting equivalent substitution are the protection scope of the invention.
Claims (8)
1. A method for treating sewage by using a high-efficiency grafted natural polymer flocculant is characterized in that the high-efficiency grafted natural polymer flocculant is used for treating sewage, the flocculant respectively uses a kaolin suspension, a humic acid aqueous solution and a hematite powder suspension as sewage samples to be treated, the turbidity removal rate of the water samples is more than 98.5% when the flocculant dosage is 0.3mg/L, the turbidity removal rate of the water samples is more than 98.5% when the flocculant dosage is 2.5mg/L, the flocculation effect of the water samples is more than 98.5% when the flocculant dosage is 2.5mg/L, the turbidity removal rate of the hematite powder suspension is more than 98.5% when the flocculant dosage is 0.4mg/L, the turbidity removal rate of the water samples is more than 98.5% when the water samples are in the range of pH=2-10, the turbidity removal rate of the water samples is more than 98.5% when the pH=2-10, and the turbidity removal rate of the water samples is more than 98.5% when the pH=2-10 when the water samples are treated, and the turbidity removal rate of the water samples is more than 98.5% when the water samples are in the range of pH=3-11;
the structural formula of the high-efficiency grafted natural polymeric flocculant is as follows:
Wherein m=50-1000, n=50-1000;
The preparation method of the high-efficiency grafted natural polymeric flocculant comprises the following steps:
Dispersing natural polymers in a sodium hydroxide or potassium hydroxide aqueous solution with the mass percentage concentration of 1-30% (the ratio of the natural polymers to the hydroxide aqueous solution is 1:2-1:5), alkalizing for 0.5-2h, then adding trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride, reacting the trimethyl- (3-chloro-2-hydroxy) propyl ammonium chloride with the natural polymers for 0.5-4h at the temperature of 30-80 ℃ in a mass ratio of 0.1:1-3:1, and precipitating and separating by taking ethanol as a precipitator after the reaction is completed to obtain the cationic natural polymers;
And 2, dissolving the cationic natural polymer obtained in the step 1 in water to prepare a solution with the mass percent concentration of 1% -3%, adding a reaction initiator, adding a mixture of acrylamide and sodium allylsulfonate, wherein the addition amount of acrylamide is 1:1-10:1, the addition amount of sodium allylsulfonate is 1:1-10:1, reacting for 1-6 hours at 45-65 ℃, and then precipitating and separating a product by taking ethanol or acetone as a precipitator to prepare the grafted amphoteric natural polymer flocculant.
2. The method for sewage treatment by using the high-efficiency grafted natural polymer flocculant according to claim 1, wherein the preparation route of the high-efficiency grafted natural polymer flocculant is as follows:
3. The method for sewage treatment by using the high-efficiency grafted natural polymer flocculant according to claim 1, wherein the substitution degree of the cationic groups in the high-efficiency grafted natural polymer flocculant is 5% -99%, the mass of the polyacrylamide is 5% -80% of the mass of the high-efficiency grafted natural polymer flocculant, and the mass of the polyallylsulphonate is 5% -70% of the mass of the high-efficiency grafted natural polymer flocculant.
4. The method for preparing the efficient grafted natural polymer flocculant for sewage treatment according to claim 1, wherein the efficient grafted natural polymer flocculant is prepared by dispersing starch (about 15 ten thousand weight average molecular weight) in 5% aqueous sodium hydroxide solution (the ratio of starch to aqueous sodium hydroxide solution is 1:4), alkalifying for 1h at 70 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propylammonium chloride, reacting trimethyl- (3-chloro-2-hydroxy) propylammonium chloride with starch in a mass ratio of 2:1 at 70 ℃ for 2h, precipitating and separating by using ethanol as a precipitator after the reaction is completed to obtain cationic starch, dissolving the cationic starch in water, preparing a solution with a mass percent concentration of 1% of the cationic starch, adding ammonium persulfate as an initiator (the addition amount is 2% of the molar number of starch units after the solution is uniform, adding acrylamide (the mass ratio of acrylamide to the cationic starch is 5:1) and sodium allylsulfonate (the mass ratio of the cationic starch is 3:1), performing a magnetic precipitation of the mixture of the cationic flocculant and the sodium allylsulfonate is 25% (the solution is the maximum, the solubility of the solution is 25% of the aqueous solution under the conditions of the water, and the magnetic precipitation is the maximum, and the magnetic precipitation is carried out by using the method of which shows that the ionic concentration of the polypropylene is 25%, 100g of water dissolved 21g of grafted amphoteric starch flocculant product.
5. The method for preparing the efficient grafted natural polymer flocculant for sewage treatment according to claim 1 is characterized in that cellulose is dispersed in a 1% potassium hydroxide aqueous solution (the ratio of the cellulose to the sodium hydroxide aqueous solution is 1:5), alkalization is carried out for 2 hours at 20 ℃, then trimethyl- (3-chloro-2-hydroxy) propylammonium chloride is added, the ratio of the trimethyl- (3-chloro-2-hydroxy) propylammonium chloride to the cellulose is 3:1, the reaction is carried out for 0.5 hour at 30 ℃, ethanol is used as a precipitator after the reaction is completed, precipitation separation is carried out to obtain cationic cellulose, the cationic cellulose is dissolved in water, a solution with the mass percent concentration of the cationic cellulose being 2%, ammonium persulfate is added as an initiator (the addition amount is 3% of the mole number of cellulose units) after the solution is uniform, acrylamide is added (the mass ratio of the cellulose to the cationic cellulose is 1:1), sodium allylsulfonate (the mass ratio of the cellulose to the cationic cellulose is 8:1), the graft sodium sulfonate is used as a solution with the mass percent of the cellulose being 25 percent, and the maximum mass percent of the cellulose is subjected to the solution of the solution, and the solution is subjected to the experimental method, wherein the solution is prepared by the method, the solution has the maximum solubility of the ionic phase of the cellulose is 25 g, and the solution is 25 g, and the maximum, and the solution is subjected to the experimental method.
6. The method for treating sewage by using the high-efficiency grafted natural polymer flocculant according to claim 1, wherein the flocculant is used for simulating water samples by using kaolin suspensions (negative charges), humic acid aqueous solutions (negative charges) and red iron powder suspensions (positive charges) with different charges, and the actual flocculation effect is observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm), wherein the flocculation effect is good for the kaolin suspensions in the range of pH=2-9, the turbidity removal rate of the water samples is more than 98.5% when the flocculant dosage is 0.1-0.5mg/L, the flocculation effect is good for the humic acid aqueous solutions in the range of pH=3-9, the removal rate of humic acid in the treated water samples is higher than 98.5% when the flocculant dosage is 2.0-7.5mg/L, and the flocculation effect is good for the red iron powder suspensions in the range of pH=4-11, and the turbidity removal rate of the water samples is more than 98.5%.
7. The method for preparing the efficient grafted natural polymer flocculant for sewage treatment according to claim 1, which is characterized in that the efficient grafted natural polymer flocculant is prepared by dispersing chitin in a 20% potassium hydroxide aqueous solution (the ratio of the chitin to the potassium hydroxide aqueous solution is 1:3), alkalizing for 1h at 40 ℃, then adding trimethyl- (3-chloro-2-hydroxy) propylammonium chloride, reacting trimethyl- (3-chloro-2-hydroxy) propylammonium chloride with the chitin for 3h at 50 ℃, using ethanol as a precipitator after the reaction is finished, precipitating and separating to obtain cationic chitin, dissolving the cationic chitin in water to prepare a solution with the mass percent concentration of the cationic chitin of 2%, adding cerium ammonium nitrate as an initiator (the addition amount is 2% of the molar number of chitin units after the solution is uniform, then adding acrylamide (the mass ratio of the acrylamide to the cationic chitin is 2:1) and sodium allylsulfonate (the mass ratio of the chitosan is 10:1), performing a grafting reaction with the sodium allylsulfonate at 60 ℃ for 0.5:1, and performing a magnetic separation on the flocculant with the mass percent of the aqueous solution of the cationic flocculant of which the mass percent is 25% (the maximum ionic group, wherein the solution is the ionic solution of the flocculant is the polypropylene with the maximum mass percent of the ionic group of which is 25 g), and the maximum solubility of the flocculant is obtained by the method of the experimental analysis.
8. The method for treating sewage by using the high-efficiency grafted natural polymer flocculant according to claim 6, wherein the flocculant is used for simulating water samples by using a kaolin suspension (negative charge), a humic acid aqueous solution (negative charge) and a red iron powder suspension (positive charge), the actual flocculation effect of the flocculant is observed by a spectrophotometer (wavelength 630 nm) and an ultraviolet spectrophotometer (wavelength 254 nm), the flocculation effect of the flocculant is good when the flocculant dosage is 0.8-2mg/L in the range of pH=2-8, the turbidity removal rate of the water sample is more than 98%, the flocculation effect of the flocculant is good when the flocculant dosage is 3.1-0.5 mg/L in the range of pH=3.5-10, the flocculation effect of the treated water sample is higher than 98.5% when the flocculant dosage is 3.0-9.5mg/L, and the flocculation effect of the flocculant dosage is 0.1-0.5mg/L in the range of pH=4-11, and the turbidity removal rate of the water sample is more than 98.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311343938.9A CN119841423A (en) | 2023-10-17 | 2023-10-17 | Method for treating sewage by using high-efficiency grafted natural polymer flocculant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311343938.9A CN119841423A (en) | 2023-10-17 | 2023-10-17 | Method for treating sewage by using high-efficiency grafted natural polymer flocculant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119841423A true CN119841423A (en) | 2025-04-18 |
Family
ID=95358908
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311343938.9A Pending CN119841423A (en) | 2023-10-17 | 2023-10-17 | Method for treating sewage by using high-efficiency grafted natural polymer flocculant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119841423A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351995A (en) * | 2011-07-21 | 2012-02-15 | 陕西科技大学 | Starch-based graft copolymer coal water slurry dispersant and preparation method thereof |
| CN102585097A (en) * | 2012-02-26 | 2012-07-18 | 河南工业大学 | Method for preparing amphoteric starch |
| CN103087265A (en) * | 2013-02-17 | 2013-05-08 | 南京大学 | Preparation method of grafted amphoteric starch flocculants |
| CN103889395A (en) * | 2011-11-04 | 2014-06-25 | 阿克佐诺贝尔化学国际公司 | Graft dendrite copolymers, and methods for producing the same |
| CN106632859A (en) * | 2016-12-12 | 2017-05-10 | 江苏中铁奥莱特新材料股份有限公司 | Preparation method of starch grafting concrete thickener |
-
2023
- 2023-10-17 CN CN202311343938.9A patent/CN119841423A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102351995A (en) * | 2011-07-21 | 2012-02-15 | 陕西科技大学 | Starch-based graft copolymer coal water slurry dispersant and preparation method thereof |
| CN103889395A (en) * | 2011-11-04 | 2014-06-25 | 阿克佐诺贝尔化学国际公司 | Graft dendrite copolymers, and methods for producing the same |
| CN102585097A (en) * | 2012-02-26 | 2012-07-18 | 河南工业大学 | Method for preparing amphoteric starch |
| CN103087265A (en) * | 2013-02-17 | 2013-05-08 | 南京大学 | Preparation method of grafted amphoteric starch flocculants |
| CN106632859A (en) * | 2016-12-12 | 2017-05-10 | 江苏中铁奥莱特新材料股份有限公司 | Preparation method of starch grafting concrete thickener |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101880356B (en) | Preparation method of grafting amphoteric chitosan flocculant | |
| Bolto et al. | Organic polyelectrolytes in water treatment | |
| Dong et al. | Flocculation of algal cells by amphoteric chitosan-based flocculant | |
| CN103087265A (en) | Preparation method of grafted amphoteric starch flocculants | |
| CN101307119B (en) | A kind of preparation method of amphoteric chitosan flocculant | |
| CN104774290B (en) | A kind of pH, temperature dual sensitiveness chitosan flocculant and its preparation method and application | |
| CN103387279B (en) | Chemical bond connected strong cationic grafted amphoteric chitosan flocculant and preparation method thereof | |
| CN104017136B (en) | Preparation method of amphoteric grafting-type modified cellulose flocculant | |
| CN103121742A (en) | Inorganic-modified chitosan composite type polymeric flocculant | |
| CN103172790B (en) | A kind of hydrolysis graft type strengthens anionic carboxymethyl cellulose flocculation agent and method for making thereof | |
| Wang et al. | New sustainable Mannich-functionalized lignin flocculants for ultra-efficiently tailoring wastewater purification | |
| CN104804139A (en) | Flocculation sterilization difunctional grafting starch water treatment agent and preparation method thereof | |
| CN102952238A (en) | Preparation method and application of polymeric flocculant | |
| CN102532418B (en) | A graft-modified composite biological flocculant and its preparation method | |
| CN101215033A (en) | A method of using straw to prepare ecological composite flocculant | |
| Liu et al. | Preparation of the modified chitosan flocculant introduced acryloyloxyethyl trimethyl ammonium chloride and 2-acrylamido-2-methyl propane sulfonic acid for the treatment of papermaking wastewater | |
| P Singh et al. | Novel biodegradable polymeric flocculants based on cationic polysaccharides | |
| CN1654348A (en) | Composite flocculant for printing and dyeing wastewater treatment | |
| Du et al. | Insight into the purification of algael water by a novel flocculant with enhanced branched nanochitosan structure | |
| US11661361B2 (en) | Enhanced coagulation method for removing microplastics in water | |
| CN102285709B (en) | Preparation method for ecological high-efficient complex flocculating agent | |
| Sun et al. | New class of flocculants and coagulants | |
| AU2020102174A4 (en) | A kind of modified starch/quartz sand composite microsphere and its preparation method and application | |
| CN119841423A (en) | Method for treating sewage by using high-efficiency grafted natural polymer flocculant | |
| CN1202022C (en) | Ecological safety composite type iron system high-effective flocculating agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |