CN106966475B - Leather sewage treatment agent - Google Patents
Leather sewage treatment agent Download PDFInfo
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- CN106966475B CN106966475B CN201710321141.7A CN201710321141A CN106966475B CN 106966475 B CN106966475 B CN 106966475B CN 201710321141 A CN201710321141 A CN 201710321141A CN 106966475 B CN106966475 B CN 106966475B
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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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical 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
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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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
- C02F1/28—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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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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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- Environmental & Geological Engineering (AREA)
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention discloses a leather sewage treatment agent which comprises the following raw materials in parts by weight: the flocculant is a special treating agent for leather sewage, and can promote various impurities in sewage to settle in multiple directions and multiple angles according to the different properties of different treating agents, wherein the addition of the 4A zeolite can play a good skeleton role in the treating agent, so that sludge flocs can keep porous during dehydration, collapse of the flocs is prevented, the compressibility of the impurities in the sewage is reduced, the surface charge and the interfacial activity of sludge particles can be effectively improved by the matching use of the components, and the filtering speed of the sludge is greatly improved.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a leather sewage treatment agent.
Background
The sewage of leather factory is composed of strongly acidic liming and dehairing waste water and weakly acidic tanning waste water, the waste water contains high-concentration tanning material, chloride, sulfide, surfactant, chemical assistant, grease, protein, water suspended matter and the like, the waste water has turbid appearance and unpleasant smell, and can be discharged only after being treated.
In the prior art, leather sewage can achieve higher dehydration efficiency only by adding chemical agents for chemical regulation, common chemical agents are organic polymeric flocculant and inorganic flocculant, common organic polymeric flocculant is polyacrylamide, inorganic flocculant is ferric chloride, aluminum polysilicate, polymeric aluminum ferric chloride and the like, a single flocculant can only act on one or two types of substances in the sewage, the actual flocculation effect is not obvious, and the mechanism of the synergistic action or synergistic action between the composite flocculants is not clear, so the prior art can not give guidance for combination or matching use among the flocculants, the flocculant with better effect obtained by repeated combination and attempt has certain contingency and unpredictability, the failure probability is higher, and the existing flocculant can not achieve good flocculation effect due to complex components of the leather sewage, particularly, the leather wastewater contains sulfur ions and chromium ions, has strong toxicity, and does not find a treatment agent aiming at the leather wastewater and having excellent effect.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a leather sewage treatment agent.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the leather sewage treatment agent comprises the following raw materials in parts by weight: 15-20 parts of fly ash, 10-15 parts of attapulgite, 20-25 parts of 4A zeolite, 20-25 parts of lime and 10-15 parts of clay.
The preferable leather sewage treatment agent further comprises 35-45 parts of modified chitosan, and the modified chitosan is obtained according to the following steps:
adding chitosan into a 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7-8 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1-2 hours at 50-60 ℃, adjusting the pH value to 3-5 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1-2 hours at 50-60 ℃ after the dropwise addition is finished to obtain a reaction solution; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 10-15 ml: 0.2-0.5 g: 10-15 ml: 0.01-0.05 g: 2-3 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7-8, stirring for 1-2 hours until the precipitation is complete, filtering, washing the filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
The preferable leather sewage treatment agent comprises the following raw materials in parts by weight: 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime and 12 parts of clay.
The preferable leather sewage treatment agent also comprises 40 parts of modified chitosan.
The preferable leather sewage treatment agent is characterized in that the mass volume ratio of chitosan, acetic acid solution, 2, 3-epoxypropyl trimethyl ammonium chloride, acetone, potassium persulfate and methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g.
The preferable leather sewage treatment agent comprises the following raw materials in parts by weight: 40 parts of modified chitosan, 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime and 12 parts of clay; the modified chitosan is obtained according to the following steps:
adding chitosan into 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1 hour at 55 ℃, adjusting the pH value to 4 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1 hour at 55 ℃ after dropwise addition is finished to obtain reaction liquid; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7, stirring for 1 hour until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
Compared with the prior art, the invention has the following advantages:
the flocculant is a special treating agent for leather sewage, and can promote various impurities in the sewage to settle in multiple directions and multiple angles according to the different properties of different treating agents, wherein the addition of the 4A zeolite can play a good skeleton role in the treating agent, so that sludge flocs can keep porous during dehydration, the collapse of the flocs is prevented, the compressibility of impurities in the sewage is reduced, the surface charge and the interfacial activity of sludge particles can be effectively improved by the matching use of all the components, and the filtering speed of the sludge is greatly improved;
according to the sewage treatment agent disclosed by the invention, a large amount of micro particles in sludge are flocculated into compact large floccules with the diameter of 5-10 mm through flocculation under the action of adsorption and bridging in the sewage treatment process, so that the number of capillaries in sewage is greatly reduced, the radius of the capillaries is increased, the pressure of capillary water in sludge floccules is reduced, and part of capillary water which is difficult to remove is converted into free water which is easy to remove; the components of the leather sewage treatment agent can generate synergistic effect, fully play the flocculation function of the leather sewage treatment agent, well adsorb ss suspended matters in sewage and realize the dewatering synergistic effect;
the modified chitosan in the optimized components of the invention is prepared by reacting chitosan with 2, 3-epoxypropyltrimethylammonium chloride to obtain 2-hydroxypropyl trimethyl ammonium chloride chitosan, then carrying out graft copolymerization with methacrylic acid to obtain the modified chitosan, overcoming the defect that hydrogen bonds are formed in molecules or among molecules due to amino and hydroxyl in the chitosan, improving the solubility in neutral and alkaline sewage, having high adsorption capacity and selectivity on sulfide ions, chromium ions and grease in leather sewage, having large adsorption quantity, high adsorption speed and easy washing, especially having good synergistic flocculation effect on the modified chitosan and other components, having better performance in the aspects of reducing chromaticity, suspended matters and oil pollutants in wastewater, having high flocculation speed, short sedimentation time and less sludge generation amount, low treatment cost and less consumption.
Detailed Description
The invention aims to provide a method for realizing the purpose by the following technical scheme:
the leather sewage treatment agent comprises the following raw materials in parts by weight: 15-20 parts of fly ash, 10-15 parts of attapulgite, 20-25 parts of 4A zeolite, 20-25 parts of lime and 10-15 parts of clay.
The preferable leather sewage treatment agent further comprises 35-45 parts of modified chitosan, and the modified chitosan is obtained according to the following steps:
adding chitosan into a 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7-8 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1-2 hours at 50-60 ℃, adjusting the pH value to 3-5 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1-2 hours at 50-60 ℃ after the dropwise addition is finished to obtain a reaction solution; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 10-15 ml: 0.2-0.5 g: 10-15 ml: 0.01-0.05 g: 2-3 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7-8, stirring for 1-2 hours until the precipitation is complete, filtering, washing the filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
The preferable leather sewage treatment agent comprises the following raw materials in parts by weight: 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime and 12 parts of clay.
The preferable leather sewage treatment agent also comprises 40 parts of modified chitosan.
The preferable leather sewage treatment agent is characterized in that the mass volume ratio of chitosan, acetic acid solution, 2, 3-epoxypropyl trimethyl ammonium chloride, acetone, potassium persulfate and methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g.
The preferable leather sewage treatment agent comprises the following raw materials in parts by weight: 40 parts of modified chitosan, 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime and 12 parts of clay; the modified chitosan is obtained according to the following steps:
adding chitosan into 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1 hour at 55 ℃, adjusting the pH value to 4 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1 hour at 55 ℃ after dropwise addition is finished to obtain reaction liquid; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7, stirring for 1 hour until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
The invention is further described with reference to specific examples.
Example 1
A leather sewage treatment agent is composed of the following raw materials: 15kg of fly ash, 10kg of attapulgite, 20kg of 4A zeolite, 20kg of lime and 10kg of clay.
Example 2
A leather sewage treatment agent is composed of the following raw materials: 20kg of fly ash, 15kg of attapulgite, 25kg of 4A zeolite, 25kg of lime and 15kg of clay.
Example 3
A leather sewage treatment agent is composed of the following raw materials: 18kg of fly ash, 12kg of attapulgite, 22kg of 4A zeolite, 24kg of lime and 12kg of clay.
Example 4
A leather sewage treatment agent is composed of the following raw materials: 15kg of fly ash, 10kg of attapulgite, 20kg of 4A zeolite, 20kg of lime, 10kg of clay and 35kg of modified chitosan, wherein the modified chitosan is obtained according to the following steps:
adding 100kg of chitosan into 1000L of 5% acetic acid solution for swelling for 1 hour, adding 20kg of 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7 by using sodium hydroxide, then adding 1000L of acetone, reacting for 1 hour at 50 ℃, adjusting the pH value to 3 by using hydrochloric acid, sequentially adding 1kg of potassium persulfate and 200kg of methacrylic acid, and reacting for 1 hour at 50 ℃ after the dropwise addition is finished to obtain a reaction solution;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7, stirring for 1 hour until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
Example 5
A leather sewage treatment agent is composed of the following raw materials: 20kg of fly ash, 15kg of attapulgite, 25kg of 4A zeolite, 25kg of lime, 15kg of clay and 45 parts of modified chitosan, wherein the modified chitosan is obtained according to the following steps:
adding 100kg of chitosan into 1500L of 5% acetic acid solution for swelling for 1 hour, adding 50kg of 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 8 by using sodium hydroxide, then adding 1500L of acetone, reacting for 2 hours at 60 ℃, adjusting the pH value to 5 by using hydrochloric acid, sequentially adding 5kg of potassium persulfate and 300kg of methacrylic acid, and reacting for 2 hours at 60 ℃ after the dropwise addition is finished to obtain a reaction solution;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 8, stirring for 2 hours until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
Example 6
A leather sewage treatment agent is composed of the following raw materials: 18kg of fly ash, 12kg of attapulgite, 22kg of 4A zeolite, 24kg of lime, 12kg of clay and 40kg of modified chitosan, wherein the modified chitosan is obtained according to the following steps:
adding 100kg of chitosan into 1200L of 5% acetic acid solution for swelling for 1 hour, adding 30kg of 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7.5 by using sodium hydroxide, then adding 1400L of acetone, reacting at 52 ℃ for 1.5 hours, adjusting the pH value to 4 by using hydrochloric acid, sequentially adding 4kg of potassium persulfate and 220kg of methacrylic acid, and reacting at 54 ℃ for 1.5 hours after the dropwise addition is finished to obtain a reaction solution;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7.5, stirring for 1.5 hours until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
Example 7
A leather sewage treatment agent is composed of the following raw materials: 40kg of modified chitosan, 18kg of fly ash, 12kg of attapulgite, 22kg of 4A zeolite, 24kg of lime and 12kg of clay; the modified chitosan is obtained according to the following steps:
adding 100kg of chitosan into 1200L of 5% acetic acid solution for swelling for 1 hour, adding 30kg of 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7 by using sodium hydroxide, then adding 1200L of acetone, reacting for 1 hour at 55 ℃, adjusting the pH value to 4 by using hydrochloric acid, sequentially adding 4kg of potassium persulfate and 250kg of methacrylic acid, and reacting for 1 hour at 55 ℃ after the dropwise addition is finished to obtain a reaction solution;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7, stirring for 1 hour until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
The leather sewage treatment agents of examples 1 to 7 were used for the treatment of leather sewage at an amount of 2g/L by adding the leather sewage treatment agent to the leather sewage and stirring for 30 minutes, and the results are shown in Table 1:
TABLE 1 results of leather wastewater treatment agents of examples 1 to 7 applied to leather wastewater
As can be seen from the results in table 1, the leather sewage treatment agent of the present embodiments 1 to 7 has a good treatment effect on leather sewage, the removal rate of COD reaches more than 95%, the removal rate of BOD reaches more than 97%, the removal rate of chromaticity reaches more than 97%, the removal rate of SS suspended substances reaches more than 97%, and particularly, the removal rates of sulfide ions and chromium ions after adding modified chitosan reach more than 99%, so that the leather sewage treatment agent is worthy of popularization and use.
Claims (4)
1. A leather sewage treatment agent is characterized in that: the composite material comprises the following raw materials in parts by weight: 15-20 parts of fly ash, 10-15 parts of attapulgite, 20-25 parts of 4A zeolite, 20-25 parts of lime, 10-15 parts of clay and 35-45 parts of modified chitosan;
the modified chitosan is obtained according to the following steps:
adding chitosan into a 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7-8 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1-2 hours at 50-60 ℃, adjusting the pH value to 3-5 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1-2 hours at 50-60 ℃ after the dropwise addition is finished to obtain a reaction solution; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 10-15 ml: 0.2-0.5 g: 10-15 ml: 0.01-0.05 g: 2-3 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7-8, stirring for 1-2 hours until the precipitation is complete, filtering, washing the filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
2. The leather sewage treatment agent of claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime, 12 parts of clay and 40 parts of modified chitosan.
3. The leather sewage treatment agent of claim 1, wherein: the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g.
4. The leather sewage treatment agent of claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 40 parts of modified chitosan, 18 parts of fly ash, 12 parts of attapulgite, 22 parts of 4A zeolite, 24 parts of lime and 12 parts of clay; the modified chitosan is obtained according to the following steps:
adding chitosan into 5% acetic acid solution for swelling for 1 hour, adding 2, 3-epoxypropyltrimethylammonium chloride, uniformly mixing, adjusting the pH value to 7 by using sodium hydroxide, then adding acetone into the mixture, reacting for 1 hour at 55 ℃, adjusting the pH value to 4 by using hydrochloric acid, sequentially adding potassium persulfate and methacrylic acid into the mixture, and reacting for 1 hour at 55 ℃ after dropwise addition is finished to obtain reaction liquid; wherein the mass volume ratio of the chitosan to the acetic acid solution to the 2, 3-epoxypropyltrimethylammonium chloride to the acetone to the potassium persulfate to the methacrylic acid is 1 g: 12 ml: 0.3 g: 12 ml: 0.04 g: 2.5 g;
and secondly, adding sodium hydroxide into the reaction liquid obtained in the step I to adjust the pH value to 7, stirring for 1 hour until the precipitation is complete, filtering, washing a filter cake with water during filtering, and drying the filter cake to obtain the modified chitosan.
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| CN110330213B (en) * | 2019-07-03 | 2022-07-26 | 都安春旭新材料科技有限责任公司 | Efficient composite conditioner for sludge dewatering |
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| CN106396134B (en) * | 2016-02-03 | 2019-07-26 | 北京食品科学研究院 | A kind of recombination reaction medium and preparation method thereof for groundwater seepage reaction grid denitrogenation dephosphorizing |
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