CN114835228A - Flocculant composition, preparation method and application thereof in industrial wastewater treatment - Google Patents
Flocculant composition, preparation method and application thereof in industrial wastewater treatment Download PDFInfo
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- CN114835228A CN114835228A CN202210413005.1A CN202210413005A CN114835228A CN 114835228 A CN114835228 A CN 114835228A CN 202210413005 A CN202210413005 A CN 202210413005A CN 114835228 A CN114835228 A CN 114835228A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A flocculant composition, a preparation method and application thereof in industrial wastewater treatment, wherein the flocculant composition is composed of modified polyferric silicate sulfate, quaternary ammonium type cationic starch, polydimethyldiallyl ammonium chloride, disodium ethylene diamine tetraacetate, montmorillonite with the particle size of 600 meshes, diatomite and deionized water; the preparation comprises two steps of preparation of modified polyferric silicate sulfate and mixing of a flocculant composition; the composition has low cost and high flocculation efficiency, can treat various different industrial sewage, is environment-friendly, does not cause secondary pollution, has a pH application range of 2-11.5, and can be used for treating COD (chemical oxygen demand) of papermaking sewage Cr The removal rate is 80.1-83.7%, the chroma removal rate is 93.6-96.2%, and the COD of the printing and dyeing wastewater is treated Cr Removal rate 73.779.4 percent, the chroma removal rate is 93.9 to 95.2 percent, and the COD of the tannery sewage is treated Cr The removal rate is 69.9-74.1%, and the chroma removal rate is 90.9-93.4%.
Description
Technical Field
The invention relates to a flocculant composition, a preparation method and application thereof in industrial wastewater treatment, belonging to the technical field of water treatment.
Background
In recent decades, the rapid development of the industry in China has led to the rapid increase of the production of industrial sewage, the self-cleaning capacity of water bodies can not keep pace with the pollution speed, the water resource pollution is increasingly serious, and the research and application of novel high-efficiency water treatment auxiliary agents without secondary pollution is an important way for improving the water pollution condition. The flocculation treatment of the sewage is one of the key links in the sewage treatment, can remove turbidity and dirt, reduces the pollution load of the subsequent treatment of the sewage, and the flocculating agent is a key factor determining the flocculation treatment effect and has important influence on the running condition of the subsequent flow, the quality of final effluent, the cost and the like. The inorganic flocculant is roughly divided into an inorganic flocculant and an organic flocculant, the inorganic flocculant is also divided into an inorganic low-molecular flocculant and an inorganic high-molecular flocculant, such as aluminum salt systems such as aluminum sulfate and aluminum chloride and iron salt systems such as ferric chloride and ferric sulfate, which belong to inorganic low-molecular flocculants, and the inorganic low-molecular flocculant has low cost but has the obvious defects of low flocculation and precipitation speed, high drug consumption and the like; inorganic polymeric flocculants such as basic polyaluminium chloride (PAC), polyaluminium sulfate, polyferric sulfate and the like overcome the defect of low treatment efficiency of low molecular flocculants, but have poor treatment effect at low temperature and low turbidity. The organic flocculant is generally an organic high polymer, such as a polyamine flocculant, a quaternary ammonium starch-based flocculant, a polyacrylamide flocculant and the like, and compared with an inorganic flocculant, the organic flocculant is generally higher in cost, but the flocculation effect of the organic flocculant is generally better than that of the inorganic flocculant, like polyacrylamide, and the organic flocculant has the advantages of being less in dosage, strong in water quality clarification capability, high in flocculation speed, not easily influenced by the pH value of water, less in generated sludge and the like and is widely applied, but acrylamide has strong neurotoxicity and certain carcinogenicity, the water treatment field limits the dosage of polyacrylamide so as to avoid the phenomenon that excessive accumulation influences life health, and the sound is always not too loud, and the polyacrylamide is not a perfect flocculant considering that the production and use of polyacrylamide are difficult to avoid and influence human health.
Due to the defects of a single variety of flocculants, practitioners in the water treatment industry are dedicated to combining multiple varieties of flocculants to prepare flocculants with more excellent comprehensive effects and relatively low cost, so that the organic-inorganic composite flocculant composition becomes a hot point of research. Chinese patent CN110272107A discloses a high-efficiency composite flocculant for wastewater treatment and application thereof, which comprises a flocculant and a coagulant aid, and is characterized in that: 1-2.5 parts by weight of coagulant aid is compounded with each part by weight of flocculant; the flocculant is a composition of water-soluble colloid and polyacrylic acid or/and polyacrylate, wherein the polyacrylate consists of one or two of sodium polyacrylate and ammonium polyacrylate; the coagulant aid is one or two of polyaluminium chloride and polyaluminium sulfate. The water-soluble colloid is one or more of carrageenan, xanthan gum, gelatin, edible gum and pectin. And (3) throwing a flocculating agent and a coagulant aid into the wastewater with the pH value of 2-10, wherein the concentration of the flocculating agent in the wastewater is 0.05-20 mg/L. The invention has strong decontamination capability, wider application range to pH value, more obvious decontamination effect, scale inhibition effect and effectively reduced water treatment cost. In the patent, the coagulant aid uses aluminum salt, the residue of aluminum ions can cause secondary pollution, and the aluminum ions enriched in the water body can damage the nervous system of people and seriously harm the health of people.
Chinese patent CN103241817A discloses a combined flocculant which comprises the following components: 5-10 parts of polyaluminum calcium chloride, 10-20 parts of aluminum trichloride, 10-20 parts of ferric citrate, 5-8 parts of poly-ferric chloride polysulfide, 6-9 parts of poly-ferric silicate and 2-3 parts of potassium ferrate; 5-10 parts of polyaluminum chloride, 10-15 parts of soluble coating and 3-5 parts of flocculant activating component, wherein the flocculant activating component is selected from one or two of porous perlite micropowder and fly ash micropowder, and the particle size of the porous perlite micropowder is 200-300. The invention has good moisture resistance, good quality stability, long shelf life, good adaptability to natural environment and convenient use. The polyaluminum calcium chloride, the aluminum trichloride and the polyaluminum chloride used in the patent all contain water-soluble aluminum ions, and secondary pollution is difficult to avoid.
From the above, it can be seen that the development of a water treatment flocculant with high flocculation efficiency, low cost and environmental friendliness is one of the most urgent requirements of the sewage treatment industry for dealing with the increasing amount of sewage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a flocculant composition, a preparation method and application thereof in industrial wastewater treatment, and the following aims are achieved: the composite flocculant composition which has low cost and high flocculation efficiency, can treat various different industrial sewage, is environment-friendly and does not cause secondary pollution is prepared.
In order to realize the purpose, the invention adopts the following technical scheme:
a flocculant composition, a preparation method and application thereof in industrial wastewater treatment, wherein the flocculant composition is composed of modified polyferric silicate sulfate, quaternary ammonium type cationic starch, polydimethyldiallyl ammonium chloride, disodium ethylene diamine tetraacetate, montmorillonite with the particle size of 600 meshes, diatomite and deionized water; the preparation comprises two steps of preparation of modified polyferric silicate sulfate and mixing of a flocculant composition; the preparation of the modified polyferric silicate sulfate comprises two steps of synthesizing polymerized ferric sulfate and synthesizing modified polyferric silicate sulfate.
The following is a further improvement of the above technical solution:
step 1, preparation of modified polyferric silicate sulfate
(1) Polymeric ferric sulfate synthesis
Adding 88-95 wt% of sulfuric acid solution into 12-24 wt% of ferrous sulfate aqueous solution to enable the molar ratio of sulfate radicals to ferrous ions in the solution to reach 1.3-1.6, heating to 85-98 ℃, after the temperature is constant, dropwise adding 22-30 wt% of hydrogen peroxide under stirring at 500-850 rpm, wherein the addition amount of the hydrogen peroxide is 2.5-4 times of the molar amount of the ferrous sulfate, the dropwise adding rate is 0.06-0.12 mL/s, and after dropwise adding is finished, continuously stirring for constant-temperature reaction for 3-6 hours to obtain reddish brown polymeric ferric sulfate;
(2) synthesis of modified poly-silicon ferric sulfate
Adding deionized water into sodium silicate with the modulus of 1.5-2.2 to prepare 8-11 wt% of sodium silicate aqueous solution, adding 40wt% of sulfuric acid solution to adjust the pH to be 2.5-3, reacting at 40-50 ℃ and the stirring speed of 350-600 rpm for 2-4 hours, and standing at room temperature for 12-16 hours to obtain polysilicic acid for later use; mixing polymeric ferric sulfate, polysilicic acid and 1-2 wt% of sodium carboxymethylcellulose water solution according to the mass ratio of 10-12: 5-6: 2-5, heating to 60-80 ℃ under stirring at 1000-1500 rpm, dropwise adding citric acid water solution at the rate of 0.1-0.18 mL/s, continuously stirring for reacting at constant temperature for 3-5 hours after dropwise adding, and adding sodium hydroxide to adjust the pH value to be 6-7 to obtain modified polymeric ferric silicate sulfate;
the mass concentration of the citric acid aqueous solution is 10-14%, and the addition amount of the citric acid aqueous solution is 50-65% of the mass of the polymeric ferric sulfate.
Step 2, mixing the flocculant composition
The flocculant composition comprises the following components in percentage by weight:
62-66 wt% of modified poly ferric silicate sulfate,
13-16 wt% of quaternary ammonium type cationic starch,
6-9 wt% of poly dimethyl diallyl ammonium chloride,
0.8 to 1.0wt% of disodium ethylenediaminetetraacetate,
3-5 wt% of montmorillonite with the particle size of 600 meshes,
1 to 3wt% of diatomaceous earth,
The rest part less than 100wt% is complemented with deionized water;
the mixing method comprises the following steps: according to the formula, deionized water, modified polyferric silicate sulfate and disodium ethylene diamine tetraacetate are added into a mixing kettle, the stirring speed is 2000-3500 rpm, quaternary ammonium type cationic starch, poly dimethyl diallyl ammonium chloride, montmorillonite and diatomite are sequentially added, and the flocculant composition is obtained after stirring for 2.5-4 hours and discharging.
Compared with the prior art, the invention has the following beneficial effects:
1. the inorganic polymeric flocculant modified polyferric silicate sulfate with low cost and high flocculation efficiency is prepared by the invention, and the inorganic polymeric flocculant modified polyferric silicate sulfate is compounded with two organic flocculants, namely polydimethyldiallyl ammonium chloride and quaternary ammonium type cationic starch to obtain the composite flocculant composition which can treat various different industrial sewage and is environment-friendly and free from secondary pollution;
2. the pH application range of the coagulant composition obtained by the invention is 2-11.5, and the coagulant composition can be used for COD (chemical oxygen demand) of papermaking sewage Cr The removal rate is 80.1-83.7%, the chroma removal rate is 93.6-96.2%, and the COD of the printing and dyeing wastewater is treated Cr The removal rate is 73.7-79.4%, the chroma removal rate is 93.9-95.2%, and the COD of the tannery sewage is Cr The removal rate is 69.9-74.1%, and the chroma removal rate is 90.9-93%.4%。
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1: flocculant composition, preparation method and application thereof in industrial wastewater treatment
The method comprises the following steps:
1. preparation of modified ferric polysilicate
(1) Polymeric ferric sulfate synthesis
Adding a ferrous sulfate solution with the concentration of 20wt% into a sulfuric acid solution with the concentration of 92wt% to enable the molar ratio of sulfate radicals to ferrous ions in the solution to reach 1.4, heating to 93 ℃, after the temperature is constant, dropwise adding 25wt% of hydrogen peroxide under stirring at 750 revolutions per minute, wherein the adding amount of the hydrogen peroxide is 3.5 times of the molar amount of the ferrous sulfate, the dropwise adding speed is 0.1mL/s, and after the dropwise adding is finished, continuously stirring and reacting for 5 hours at constant temperature to obtain reddish brown polymeric ferric sulfate;
(2) synthesis of modified poly-silicon ferric sulfate
Adding deionized water into sodium silicate with the modulus of 1.8 to prepare 10wt% of sodium silicate aqueous solution, adding 40wt% of sulfuric acid solution to adjust the pH to be =2.8, reacting at 47 ℃ and the stirring speed of 500 revolutions per minute for 3 hours, and standing at room temperature for 15 hours to obtain polysilicic acid for later use; mixing polymeric ferric sulfate, polysilicic acid and 1.5wt% sodium carboxymethylcellulose aqueous solution according to the mass ratio of 22:11:7, heating to 73 ℃ under 1300 r/min stirring, dropwise adding the citric acid aqueous solution at the rate of 0.14mL/s, continuously stirring after dropwise adding, reacting at constant temperature for 4 hours, and adding sodium hydroxide to adjust the pH =6.3 to obtain modified polymeric ferric sulfate silicate;
the mass concentration of the citric acid aqueous solution is 12%, and the addition amount of the citric acid aqueous solution is 61% of the mass of the polymeric ferric sulfate.
2. Compounding of flocculant compositions
The flocculant composition comprises the following components in percentage by weight:
65wt% modified poly ferric silicate sulfate,
14wt% of quaternary ammonium type cationic starch,
8wt% of poly dimethyl diallyl ammonium chloride,
0.9wt% of disodium ethylene diamine tetraacetate,
4wt% of montmorillonite with the particle size of 600 meshes,
2.3wt% of diatomite,
5.8wt% deionized water;
the mixing method comprises the following steps: according to the formula, deionized water, modified polyferric silicate sulfate and disodium ethylene diamine tetraacetate are added into a mixing kettle, the stirring speed is 3000 r/min, then quaternary ammonium type cationic starch, poly dimethyl diallyl ammonium chloride, montmorillonite and diatomite are sequentially added, and the flocculant composition is obtained after stirring for 3.5 hours and discharging.
Example 2: flocculant composition, preparation method and application thereof in industrial wastewater treatment
The method comprises the following steps:
1. preparation of modified ferric polysilicate
(1) Polymeric ferric sulfate synthesis
Adding 88wt% of sulfuric acid solution into 12wt% of ferrous sulfate aqueous solution to enable the molar ratio of sulfate radicals to ferrous ions in the solution to reach 1.3, heating to 85 ℃, after the temperature is constant, dropwise adding 22wt% of hydrogen peroxide under stirring at 500 revolutions per minute, wherein the addition amount of the hydrogen peroxide is 2.5 times of the molar amount of the ferrous sulfate, the dropwise adding speed is 0.06mL/s, and after the dropwise adding is finished, continuously stirring for constant-temperature reaction for 3 hours to obtain reddish brown polymeric ferric sulfate;
(2) synthesis of modified poly-silicon ferric sulfate
Adding deionized water into sodium silicate with the modulus of 1.5 to prepare 8wt% of sodium silicate aqueous solution, adding 40wt% of sulfuric acid solution to adjust the pH to be =2.5, reacting at 40 ℃ and the stirring speed of 350 r/min for 2 hours, and standing at room temperature for 12 hours to obtain polysilicic acid for later use; mixing polymeric ferric sulfate, polysilicic acid and 1wt% sodium carboxymethylcellulose aqueous solution according to the mass ratio of 10:5:2, heating to 60 ℃ under stirring at 1000 rpm, dropwise adding the citric acid aqueous solution at the rate of 0.1mL/s, continuously stirring after dropwise adding, reacting at constant temperature for 3 hours, adding sodium hydroxide, and adjusting the pH to be =6 to obtain modified polymeric ferric silicate sulfate;
the mass concentration of the citric acid aqueous solution is 10%, and the adding amount of the citric acid aqueous solution is 50% of the mass of the polymeric ferric sulfate.
2. Compounding of flocculant compositions
The flocculant composition comprises the following components in percentage by weight:
62wt% of modified polyferric silicate sulfate,
13wt% of quaternary ammonium type cationic starch,
6wt% of poly dimethyl diallyl ammonium chloride,
0.8wt% of disodium ethylene diamine tetraacetate,
3wt% of montmorillonite with the particle size of 600 meshes,
1wt% of diatomite,
14.2wt% deionized water;
the mixing method comprises the following steps: according to the formula, deionized water, modified polyferric silicate sulfate and disodium ethylene diamine tetraacetate are added into a mixing kettle, the stirring speed is 2000 r/min, then quaternary ammonium type cationic starch, poly dimethyl diallyl ammonium chloride, montmorillonite and diatomite are sequentially added, and the flocculant composition is obtained after stirring for 2.5 hours and discharging.
Example 3: flocculant composition, preparation method and application thereof in industrial wastewater treatment
The method comprises the following steps:
1. preparation of modified ferric polysilicate
(1) Polymeric ferric sulfate synthesis
Adding a 24wt% ferrous sulfate aqueous solution into a 95wt% sulfuric acid solution to enable the molar ratio of sulfate radicals to ferrous ions in the solution to reach 1.6, heating to 98 ℃, after the temperature is constant, dropwise adding 30wt% hydrogen peroxide under 850 rpm stirring, wherein the addition amount of the hydrogen peroxide is 4 times of the molar amount of the ferrous sulfate, the dropwise adding rate is 0.12mL/s, and after the dropwise adding is finished, continuously stirring and reacting at a constant temperature for 6 hours to obtain reddish brown polymeric ferric sulfate;
(2) synthesis of modified poly-silicon ferric sulfate
Adding deionized water into sodium silicate with the modulus of 2.2 to prepare 11wt% of sodium silicate aqueous solution, adding 40wt% of sulfuric acid solution to adjust the pH to be =3, reacting at 50 ℃ and the stirring speed of 600 revolutions per minute for 4 hours, and standing at room temperature for 16 hours to obtain polysilicic acid for later use; mixing polymeric ferric sulfate, polysilicic acid and 1wt% sodium carboxymethylcellulose aqueous solution according to the mass ratio of 12:6:5, heating to 80 ℃ under the stirring of 1500 rpm, dropwise adding the citric acid aqueous solution at the rate of 0.18mL/s, continuously stirring after dropwise adding, reacting at constant temperature for 5 hours, and adding sodium hydroxide to adjust the pH =7 to obtain modified polymeric ferric silicate sulfate;
the mass concentration of the citric acid aqueous solution is 14%, and the adding amount of the citric acid aqueous solution is 65% of the mass of the polymeric ferric sulfate.
2. Compounding of flocculant compositions
The flocculant composition comprises the following components in percentage by weight:
66wt% modified polyferric silicate sulfate,
16wt% of quaternary ammonium type cationic starch,
9wt% of poly dimethyl diallyl ammonium chloride,
1wt% of disodium ethylene diamine tetraacetate,
5wt% of montmorillonite with the particle size of 600 meshes,
3wt% diatomaceous earth;
the mixing method comprises the following steps: according to the formula, modified polyferric silicate sulfate and disodium ethylene diamine tetraacetate are added into a mixing kettle, the stirring speed is 3500 rpm, quaternary ammonium type cationic starch, polydimethyldiallylammonium chloride, montmorillonite and diatomite are sequentially added, and the flocculant composition is obtained after stirring for 4 hours and discharging.
Evaluation of industrial wastewater treatment: the flocculants obtained in the above examples 1, 2 and 3 were used for treating papermaking wastewater and compared with commercially available polyacrylamide and polyaluminium chloride, and the results are shown in table 1:
TABLE 1
And evaluating the industrial sewage treatment: the flocculants obtained in the above examples 1, 2 and 3 were used for treating printing and dyeing wastewater and compared with commercially available polyacrylamide and polyaluminium chloride, and the results are shown in Table 2:
TABLE 2
And evaluating industrial sewage treatment: the flocculants obtained in the above examples 1, 2 and 3 were used for tannery sewage treatment and compared with commercially available polyacrylamide and polyaluminium chloride, and the results are shown in Table 3:
TABLE 3
Claims (7)
1. A flocculant composition characterized by: the flocculation composition comprises 62-66 wt% of modified polyferric silicate sulfate, 13-16 wt% of quaternary ammonium type cationic starch, 6-9 wt% of poly dimethyl diallyl ammonium chloride, 0.8-1.0 wt% of disodium ethylene diamine tetraacetate, 3-5 wt% of montmorillonite with the particle size of 600 meshes, 1-3 wt% of kieselguhr, and the balance of less than 100wt% of deionized water.
2. A method of preparing a flocculant composition, characterized by: according to the composition raw material composition ratio, deionized water, modified polyferric silicate sulfate and ethylene diamine tetraacetic acid are added into a mixing kettle, the stirring speed is 2000-3500 rpm, quaternary ammonium type cationic starch, polydimethyldiallylammonium chloride, montmorillonite and diatomite are sequentially added, and the flocculant composition is obtained after stirring for 2.5-4 hours and discharging.
3. The method of claim 2, wherein the flocculant composition is prepared by: the preparation of the modified polyferric silicate sulfate comprises two steps of polyferric silicate synthesis and modified polyferric silicate synthesis.
4. A method of preparing a flocculant composition in accordance with claim 3, characterized in that: synthesizing polyferric sulfate, namely adding 88-95 wt% of sulfuric acid solution into 12-24 wt% of ferrous sulfate aqueous solution to enable the molar ratio of sulfate radicals to ferrous ions in the solution to reach 1.3-1.6, heating to 85-98 ℃, dropwise adding 22-30 wt% of hydrogen peroxide under stirring at 500-850 rpm after the temperature is constant, wherein the adding amount of the hydrogen peroxide is 2.5-4 times of the molar amount of the ferrous sulfate, the dropwise adding rate is 0.06-0.12 mL/s, and after dropwise adding, continuously stirring and reacting at constant temperature for 3-6 hours to obtain the reddish brown polyferric sulfate.
5. A method of preparing a flocculant composition in accordance with claim 3, characterized in that: according to the synthesis of the modified polyferric silicate, sodium silicate with a modulus of 1.5-2.2 is added with deionized water to prepare 8-11 wt% of sodium silicate aqueous solution, 40wt% of sulfuric acid solution is added to adjust the pH to be = 2.5-3, the mixture is reacted for 2-4 hours at the temperature of 40-50 ℃ and the stirring speed of 350-600 r/min, and then the mixture is stood at room temperature for 12-16 hours to obtain polysilicic acid for later use; mixing polymeric ferric sulfate, polysilicic acid and 1-2 wt% of sodium carboxymethylcellulose water solution according to the mass ratio of 10-12: 5-6: 2-5, heating to 60-80 ℃ under stirring at 1000-1500 rpm, dropwise adding citric acid water solution at the rate of 0.1-0.18 mL/s, continuously stirring for reacting at constant temperature for 3-5 hours after dropwise adding, and adding sodium hydroxide to adjust the pH value to be 6-7 to obtain the modified polymeric ferric silicate sulfate.
6. The method of claim 5, wherein the flocculant composition is prepared by: the mass concentration of the citric acid aqueous solution is 10-14%, and the addition amount of the citric acid aqueous solution is 50-65% of the mass of the polymeric ferric sulfate.
7. The application of a flocculant composition in industrial wastewater treatment is characterized in that: the flocculant composition is mainly used for papermaking sewage treatment, printing and dyeing sewage treatment and leather-making sewage treatment.
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| CN117430291A (en) * | 2023-12-12 | 2024-01-23 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
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| CN117430291A (en) * | 2023-12-12 | 2024-01-23 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
| CN117430291B (en) * | 2023-12-12 | 2024-04-30 | 南通博亿化工有限公司 | Impurity removal and purification process for acrylamide wastewater |
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