CN113134343A - Preparation method of composite material capable of reducing COD (chemical oxygen demand) in sewage - Google Patents
Preparation method of composite material capable of reducing COD (chemical oxygen demand) in sewage Download PDFInfo
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Abstract
The invention discloses a preparation method of a composite material capable of reducing COD (chemical oxygen demand) in sewage, which relates to the technical field of sewage treatment, wherein the composite material takes sodium silicate, clay and alumina as raw materials, the obtained ferroferric oxide-activated carbon composite microspheres contain the magnetofluid property of nano ferroferric oxide, the nano ferroferric oxide is fully attached to activated carbon and silicon-aluminum-based composite clay, the agglomeration of the nano ferroferric oxide can be effectively prevented, the stability of the nano ferroferric oxide is improved, graphene modified chitosan is also added into the composite material, organic heterocyclic compounds in the wastewater are fully adsorbed, the heterocyclic compounds are prevented from being desorbed, the graphene modified chitosan is uniformly dispersed on the surface of the ferroferric oxide-activated carbon composite microspheres, the COD adsorption performance is further improved, and the wastewater value can be effectively reduced; in addition, carboxyl negative ions of the sodium alginate and amino groups of the chitosan can adsorb organic acid and alkali impurities in the wastewater, so that the COD value is reduced.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a preparation method of a composite material capable of reducing COD in sewage.
Background
In recent years, with the acceleration of urbanization process in China and the rapid development of modern industry, the discharge amount of sewage in cities and industries is increased year by year, and the discharge amount becomes a main obstacle for restricting the rapid and good development of national economy and the improvement of the quality of life of people. Particularly, the population of China is large, the water resources of everyone are deficient, and the quality of water quality directly influences the physical health of people in China.
The urban and industrial sewage is complex in composition, contains a large amount of pollutants such as heavy metals and organic matters, has COD (chemical oxygen demand) values of sewage of partial areas even up to 5000-20000 mg/L, is difficult to treat, and is more and more concerned by the society. The current sewage treatment method adopts natural or artificial materials to adsorb pollutants in water, and the optional materials comprise zeolite, clay, activated carbon, alloy materials and the like, but the materials have single adsorption effect, and the purified water quality does not reach the standard. Several materials can be compounded to prepare the multifunctional water treatment material, but the effect of the multifunctional water treatment material is not ideal for the complex water quality produced by industry, especially for chemical wastewater (containing complex aromatic heterocyclic compounds and organic acid and alkali), and the COD value after treatment still does not reach the standard. Therefore, the development of a novel multifunctional water treatment agent can effectively remove aromatic heterocyclic compounds, organic acids and bases in urban and industrial wastewater and reduce the COD value of the wastewater, and is one of the problems in the prior wastewater treatment.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a preparation method of a composite material capable of reducing COD in sewage, which can effectively remove aromatic heterocyclic compounds, organic acids and alkalis in urban and industrial wastewater and reduce the COD value of the wastewater.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of a composite material capable of reducing COD in sewage comprises the steps of attaching nano ferroferric oxide microspheres to activated carbon and silicon-aluminum-based composite clay, and adding graphene modified chitosan and sodium alginate to prepare the composite material;
a preferred method of preparation comprises the steps of:
adding 2-4 parts by weight of sodium silicate, 3-5 parts by weight of clay and 1-3 parts by weight of alumina into an acid solution, heating to 100-120 ℃, stirring for reaction for 2-4 hours, introducing nitrogen into the reaction solution for 5-10 minutes, transferring the reaction solution into a muffle furnace, heating to 150-200 ℃, calcining for 20-40 minutes, heating to 400-600 ℃, and calcining for 20-40 minutes to obtain the silicon-aluminum-based composite clay; the acid solution is a formic acid solution or an acetic acid solution with the mass concentration of 10-15%;
② taking 10-15 parts of FeCl2•4H2O and 8-12 parts of FeCl3•6H2Adding O into 150-250 parts of water, stirring for 10-30 minutes, heating to 40-70 ℃, adding 5-20 parts of ammonia water, reacting for 1-3 hours, cooling to 10-30 ℃, filtering, washing a filter cake with 80-120 parts of deionized water, adding into 200-250 parts of deionized water after washing, adding 6-8 parts of activated carbon and the silicon-aluminum-based composite clay obtained in the step I, ultrasonically oscillating for 10-20 minutes, stirring for 10-20 minutes, filtering, and washing the filter cake with 50-70 parts of deionized water to obtain the ferroferric oxide-activated carbon composite microspheres;
adding 4-6 parts of chitosan and 1-3 parts of graphene into a mixed solution of 300-600 parts of water and dimethyl sulfoxide, adjusting the pH value of the solution to 4.5-5.5 by using acetic acid, heating to 30-50 ℃, adding 0.05-0.5 part of glutaraldehyde aqueous solution under the stirring condition, stirring for 5-15 hours, adjusting the pH value of the reaction solution to 7.5-8.5 by using sodium hydroxide aqueous solution, stirring for 5-15 minutes, filtering, and drying a filter cake to obtain graphene modified chitosan;
and fourthly, adding 1-3 parts of sodium alginate into 200-400 parts of water, stirring and dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the second step and the graphene modified chitosan obtained in the third step, stirring for 5-15 minutes, heating to 30-40 ℃, adding 0.2-0.5 part of calcium chloride, stirring for 0.5-2 hours, filtering, and drying in vacuum to obtain the composite material capable of reducing COD in sewage.
Preferably, the acid solution is a formic acid solution with a mass concentration of 12%.
Preferably, the mass concentration of the ammonia water is 20-28%.
Preferably, the mesh number of the activated carbon is 80-200 meshes.
Preferably, the molecular weight of the chitosan is 5-20 ten thousand, and the degree of deacetylation is more than 80%.
Preferably, in the mixed solution of water and dimethyl sulfoxide, the mass ratio of water to dimethyl sulfoxide is 1: 1-1: 3.
preferably, the mass concentration of the glutaraldehyde water solution is 10-20%.
Preferably, the mass concentration of the sodium hydroxide aqueous solution is 5-15%.
Preferably, the molecular weight of the sodium alginate is 5-10 ten thousand.
Compared with the prior art, the invention has the following advantages:
the invention takes sodium silicate, clay and alumina as raw materials, and adopts a high-temperature calcination method to prepare the silicon-aluminum-based composite clay, and the obtained material has large specific surface area; with FeCl2•4H2O and FeCl3•6H2The nano ferroferric oxide microspheres are prepared by taking O as a raw material and then are compounded with the activated carbon and the silicon-aluminum-based composite clay, the high-efficiency adsorption effect of the activated carbon and the larger specific surface area of the silicon-aluminum-based composite clay are fully utilized, the obtained ferroferric oxide-activated carbon composite microspheres contain the magnetic fluid property of the nano ferroferric oxide, and the nano ferroferric oxide is fully attached to the activated carbon and the silicon-aluminum-based composite clay, so that the agglomeration of the nano ferroferric oxide can be effectively prevented, and the stability of the nano ferroferric oxide-activated carbon composite microspheres is improved.
According to the invention, the graphene modified chitosan is added into the material, the graphene can fully adsorb organic heterocyclic compounds in the wastewater in a pi-pi accumulation mode, the chitosan and the graphene form a net structure after cross-linking, the adsorption effect of the graphene on the organic heterocyclic compounds is further improved, the heterocyclic compounds are prevented from being desorbed, and the graphene modified chitosan is uniformly dispersed on the surface of the ferroferric oxide-activated carbon composite microspheres, so that the adsorption performance is further improved, and the COD value of the wastewater can be effectively reduced; in addition, carboxyl negative ions in the sodium alginate and amino groups in the chitosan can be mutually attracted through electrostatic interaction, so that a better protection effect is achieved on materials, and the carboxyl negative ions of the sodium alginate and the amino groups of the chitosan can adsorb organic acid and alkali impurities in wastewater, so that the COD value is reduced.
Detailed Description
The invention is further described with reference to specific examples.
A preparation method of a composite material capable of reducing COD in sewage comprises the steps of attaching nano ferroferric oxide microspheres to activated carbon and silicon-aluminum-based composite clay, and adding graphene modified chitosan and sodium alginate to prepare the composite material;
a preferred method of preparation comprises the steps of:
adding 2-4 parts by weight of sodium silicate, 3-5 parts by weight of clay and 1-3 parts by weight of alumina into an acid solution, heating to 100-120 ℃, stirring for reaction for 2-4 hours, introducing nitrogen into the reaction solution for 5-10 minutes, transferring the reaction solution into a muffle furnace, heating to 150-200 ℃, calcining for 20-40 minutes, heating to 400-600 ℃, and calcining for 20-40 minutes to obtain the silicon-aluminum-based composite clay; the acid solution is a formic acid solution or an acetic acid solution with the mass concentration of 10-15%; the silica-alumina-based composite clay is prepared from sodium silicate, clay and alumina by a high-temperature calcination method, and the obtained material has a large specific surface area.
② taking 10-15 parts of FeCl2•4H2O and 8-12 parts of FeCl3•6H2Adding O into 150-250 parts of water, stirring for 10-30 minutes, heating to 40-70 ℃, adding 5-20 parts of ammonia water, reacting for 1-3 hours, cooling to 10-30 ℃, filtering, washing a filter cake with 80-120 parts of deionized water, adding into 200-250 parts of deionized water after washing, adding 6-8 parts of activated carbon and the silicon-aluminum-based composite clay obtained in the step I, ultrasonically oscillating for 10-20 minutes, stirring for 10-20 minutes, filtering, and washing the filter cake with 50-70 parts of deionized water to obtain the ferroferric oxide-activated carbon composite microspheres;
with FeCl2•4H2O and FeCl3•6H2Preparing nano ferroferric oxide microspheres by taking O as raw material, and compounding with active carbon and silicon-aluminum-based composite clayThe high-efficiency adsorption effect of the activated carbon and the larger specific surface area of the silicon-aluminum-based composite clay are fully utilized, the obtained ferroferric oxide-activated carbon composite microspheres contain the magnetic fluid property of nano ferroferric oxide, and the nano ferroferric oxide is fully attached to the activated carbon and the silicon-aluminum-based composite clay, so that the agglomeration of the nano ferroferric oxide can be effectively prevented, and the stability of the nano ferroferric oxide-activated carbon composite microspheres is improved.
Adding 4-6 parts of chitosan and 1-3 parts of graphene into a mixed solution of 300-600 parts of water and dimethyl sulfoxide, adjusting the pH value of the solution to 4.5-5.5 by using acetic acid, heating to 30-50 ℃, adding 0.05-0.5 part of glutaraldehyde aqueous solution under the stirring condition, stirring for 5-15 hours, adjusting the pH value of the reaction solution to 7.5-8.5 by using sodium hydroxide aqueous solution, stirring for 5-15 minutes, filtering, and drying a filter cake to obtain graphene modified chitosan;
the graphene modified chitosan is added into the material, the graphene can fully adsorb organic heterocyclic compounds in the wastewater in a pi-pi accumulation mode, the chitosan and the graphene form a net structure after cross-linking, the adsorption effect of the graphene on the organic heterocyclic compounds is further improved, the heterocyclic compounds are prevented from being desorbed, the graphene modified chitosan is uniformly dispersed on the surface of the ferroferric oxide-activated carbon composite microspheres, the adsorption performance is further improved, and the COD value of the wastewater can be effectively reduced.
Adding 1-3 parts of sodium alginate into 200-400 parts of water, stirring for dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the step (II) and the graphene modified chitosan obtained in the step (III), stirring for 5-15 minutes, heating to 30-40 ℃, adding 0.2-0.5 part of calcium chloride, stirring for 0.5-2 hours, filtering, and vacuum drying to obtain a composite material capable of reducing COD in sewage;
the carboxyl negative ions in the sodium alginate and the amino groups in the chitosan can be mutually attracted through electrostatic interaction, so that the material is better protected, and the carboxyl negative ions of the sodium alginate and the amino groups of the chitosan can adsorb organic acid and alkali impurities in the wastewater, so that the COD value is reduced.
Preferably, the acid solution is a formic acid solution with a mass concentration of 12%.
Preferably, the mass concentration of the ammonia water is 20-28%.
Preferably, the mesh number of the activated carbon is 80-200 meshes.
Preferably, the molecular weight of the chitosan is 5-20 ten thousand, and the degree of deacetylation is more than 80%.
Preferably, in the mixed solution of water and dimethyl sulfoxide, the mass ratio of water to dimethyl sulfoxide is 1: 1-1: 3.
preferably, the mass concentration of the glutaraldehyde water solution is 10-20%.
Preferably, the mass concentration of the sodium hydroxide aqueous solution is 5-15%.
Preferably, the molecular weight of the sodium alginate is 5-10 ten thousand.
The invention is further described with reference to specific examples.
Example 1
A preparation method of a composite material capable of reducing COD in sewage comprises the following steps:
(1) adding 2kg of sodium silicate, 3kg of clay and 1kg of alumina into a 10% formic acid solution, heating to 100 ℃, stirring for reaction for 2 hours, filling nitrogen into the reaction solution for 5 minutes, transferring the reaction solution to a muffle furnace, heating to 150 ℃, calcining for 20 minutes, heating to 400 ℃, and calcining for 20 minutes to obtain the silicon-aluminum-based composite clay;
(2) taking 10kg of FeCl2•4H2O and 8kg FeCl3•6H2Adding O, adding into 150kg of water, stirring for 10 minutes, heating to 40 ℃, adding 5kg of ammonia water with the mass concentration of 20%, reacting for 1 hour, cooling to 10 ℃, filtering, washing a filter cake with 80kg of deionized water, adding into 200kg of deionized water after washing, adding 6kg of activated carbon and the silicon-aluminum-based composite clay obtained in the step (1), ultrasonically oscillating for 10 minutes, stirring for 10 minutes, filtering, and washing the filter cake with 50kg of deionized water to obtain the ferroferric oxide-activated carbon composite microspheres;
(3) adding 4kg of chitosan and 1kg of graphene into 300kg of mixed solution of water and dimethyl sulfoxide (the mass ratio of the water to the dimethyl sulfoxide is 1: 1), adjusting the pH value of the solution to 4.5 by using acetic acid, heating to 30 ℃, adding 0.05kg of glutaraldehyde aqueous solution with the mass concentration of 10% under the condition of stirring, stirring for 5 hours, adjusting the pH value of the reaction solution to 7.5 by using sodium hydroxide aqueous solution (the mass concentration is 5%), stirring for 5 minutes, filtering, and drying a filter cake to obtain graphene modified chitosan;
(4) and (3) adding 1kg of sodium alginate into 200kg of water, stirring for dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the step (2) and the graphene modified chitosan obtained in the step (3), stirring for 5 minutes, heating to 30 ℃, adding 0.2kg of calcium chloride, stirring for 0.5 hour, filtering, and drying in vacuum to obtain the composite material capable of reducing COD in the sewage.
Example 2
A preparation method of a composite material capable of reducing COD in sewage comprises the following steps:
(1) adding 4kg of sodium silicate, 5kg of clay and 3kg of alumina into an acetic acid solution with the mass concentration of 15%, heating to 120 ℃, stirring for reaction for 4 hours, filling nitrogen into the reaction solution for 10 minutes, transferring the reaction solution to a muffle furnace, heating to 200 ℃, calcining for 40 minutes, heating to 600 ℃, and calcining for 40 minutes to obtain the silicon-aluminum-based composite clay;
(2) taking 15kg of FeCl2•4H2O and 12kg FeCl3•6H2Adding O into 250kg of water, stirring for 30 minutes, heating to 70 ℃, adding 2kg of ammonia water with the mass concentration of 28%, reacting for 3 hours, cooling to 30 ℃, filtering, washing a filter cake with 120kg of deionized water, adding the filter cake into 250kg of deionized water after washing, adding 8kg of activated carbon with the mesh number of 80-200 and the silicon-aluminum-based composite clay obtained in the step (1), ultrasonically oscillating for 20 minutes, stirring for 20 minutes, filtering, and washing the filter cake with 7kg of deionized water to obtain the ferroferric oxide-activated carbon composite microspheres;
(3) adding 6kg of chitosan (molecular weight is 5 ten thousand, and deacetylation degree is more than 80%) and 3kg of graphene into 600kg of mixed solution of water and dimethyl sulfoxide (mass ratio of water to dimethyl sulfoxide is 1: 3), adjusting pH value of the solution to 5.5 with acetic acid, heating to 50 ℃, adding 0.5kg of glutaraldehyde aqueous solution with mass concentration of 20% under stirring, stirring for 15 hours, adjusting pH value of the reaction solution to 8.5 with sodium hydroxide aqueous solution (mass concentration is 15%), stirring for 15 minutes, filtering, and drying filter cakes to obtain graphene modified chitosan;
(4) and (3) adding 3kg of sodium alginate (with the molecular weight of 5 ten thousand) into 400kg of water, stirring and dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the step (2) and the graphene modified chitosan obtained in the step (3), stirring for 15 minutes, heating to 40 ℃, adding 0.5kg of calcium chloride, stirring for 2 hours, filtering, and drying in vacuum to obtain the composite material capable of reducing COD in the sewage.
Example 3
A preparation method of a composite material capable of reducing COD in sewage comprises the following steps:
(1) adding 3kg of sodium silicate, 4kg of clay and 2kg of alumina into a formic acid solution with the mass concentration of 12%, heating to 110 ℃, stirring for reaction for 3 hours, filling nitrogen into the reaction solution for 8 minutes, transferring the reaction solution to a muffle furnace, heating to 170 ℃, calcining for 30 minutes, heating to 500 ℃, and calcining for 30 minutes to obtain the silicon-aluminum-based composite clay;
(2) taking 13kg of FeCl2•4H2O and 10kg FeCl3•6H2Adding O into 200kg of water, stirring for 20 minutes, heating to 50 ℃, adding 12kg of ammonia water with the mass concentration of 25%, reacting for 2 hours, cooling to 20 ℃, filtering, washing a filter cake with 100kg of deionized water, adding the washed filter cake into 220kg of deionized water, adding 7kg of activated carbon with the mesh number of 80-200 and the silicon-aluminum-based composite clay obtained in the step (1), ultrasonically oscillating for 15 minutes, stirring for 15 minutes, filtering, washing the filter cake with 60kg of deionized water, and obtaining the ferroferric oxide-activated carbon composite microsphere
(3) Adding 5kg of chitosan (the molecular weight is 20 ten thousand, and the degree of deacetylation is more than 80%) and 2kg of graphene into 400kg of a mixed solution of water and dimethyl sulfoxide (the mass ratio of the water to the dimethyl sulfoxide is 1: 2), adjusting the pH value of the solution to 5.0 by using acetic acid, heating to 40 ℃, adding 0.2kg of glutaraldehyde aqueous solution with the mass concentration of 15% under the stirring condition, stirring for 10 hours, adjusting the pH value of a reaction solution to 8.0 by using a sodium hydroxide aqueous solution (the mass concentration is 10%), stirring for 10 minutes, filtering, and drying a filter cake to obtain graphene modified chitosan;
(4) and (3) adding 2kg of sodium alginate (with the molecular weight of 10 ten thousand) into 300kg of water, stirring and dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the step (2) and the graphene modified chitosan obtained in the step (3), stirring for 10 minutes, heating to 35 ℃, adding 0.35kg of calcium chloride, stirring for 1.3 hours, filtering, and drying in vacuum to obtain the composite material capable of reducing COD in the sewage.
Test example 1
Treatment of domestic sewage
1g of the composite material capable of reducing COD in sewage prepared in examples 1, 2 and 3 was added to 100mL of domestic sewage (obtained from a sewage treatment plant in the western region of Jinan City), stirred at room temperature for 6 hours, and then various sewage indexes were measured and compared with the sewage treatment material prepared in patent CN105905990A, and the results are shown in Table 1.
TABLE 1 treatment Effect of the composite materials prepared in examples 1, 2 and 3 on domestic wastewater
As shown in Table 1, the indexes of the domestic sewage treated by the composite materials capable of reducing COD in the sewage prepared in the embodiments 1, 2 and 3 of the invention are all better than those of the sewage treatment material prepared in CN105905990A, and the treated sewage is combined with the Standard of Integrated wastewater discharge of the people's republic of China.
Test example 2
Treatment of industrial waste water
15g of the composite material capable of reducing COD in sewage prepared in examples 1, 2 and 3 was added to 100mL of sewage discharged from a chemical plant, stirred at room temperature for 24 hours, and then various indexes of the sewage were measured and compared with those of the sewage treatment material prepared in patent CN105905990A, and the results are shown in Table 2.
TABLE 2 treatment Effect of the composite materials prepared in examples 1, 2 and 3 on the wastewater discharged from chemical plants
As shown in Table 2, the composite material capable of reducing COD in sewage prepared by the invention has a good treatment effect on sewage discharged from chemical plants, and all indexes of the treated sewage meet requirements.
Claims (10)
1. A preparation method of a composite material capable of reducing COD in sewage is characterized by comprising the following steps: the nano ferroferric oxide microspheres are attached to activated carbon and silicon-aluminum-based composite clay, and graphene modified chitosan and sodium alginate are added to prepare the nano ferroferric oxide composite clay.
2. The method for preparing the composite material capable of reducing COD in sewage according to claim 1, is characterized in that: the method comprises the following steps:
adding 2-4 parts by weight of sodium silicate, 3-5 parts by weight of clay and 1-3 parts by weight of alumina into an acid solution, heating to 100-120 ℃, stirring for reaction for 2-4 hours, introducing nitrogen into the reaction solution for 5-10 minutes, transferring the reaction solution into a muffle furnace, heating to 150-200 ℃, calcining for 20-40 minutes, heating to 400-600 ℃, and calcining for 20-40 minutes to obtain the silicon-aluminum-based composite clay; the acid solution is a formic acid solution or an acetic acid solution with the mass concentration of 10-15%;
② taking 10-15 parts of FeCl2•4H2O and 8-12 parts of FeCl3•6H2Adding O into 150-250 parts of water, stirring for 10-30 minutes, heating to 40-70 ℃, adding 5-20 parts of ammonia water, reacting for 1-3 hours, cooling to 10-30 ℃, filtering, washing a filter cake with 80-120 parts of deionized water, adding into 200-250 parts of deionized water after washing, adding 6-8 parts of activated carbon and the silicon-aluminum-based composite clay obtained in the step I, ultrasonically oscillating for 10-20 minutes, stirring for 10-20 minutes, filtering, and washing the filter cake with 50-70 parts of deionized water to obtain the ferroferric oxide-activated carbon composite microspheres;
adding 4-6 parts of chitosan and 1-3 parts of graphene into a mixed solution of 300-600 parts of water and dimethyl sulfoxide, adjusting the pH value of the solution to 4.5-5.5 by using acetic acid, heating to 30-50 ℃, adding 0.05-0.5 part of glutaraldehyde aqueous solution under the stirring condition, stirring for 5-15 hours, adjusting the pH value of the reaction solution to 7.5-8.5 by using sodium hydroxide aqueous solution, stirring for 5-15 minutes, filtering, and drying a filter cake to obtain graphene modified chitosan;
and fourthly, adding 1-3 parts of sodium alginate into 200-400 parts of water, stirring and dissolving, adding the ferroferric oxide-activated carbon composite microspheres obtained in the second step and the graphene modified chitosan obtained in the third step, stirring for 5-15 minutes, heating to 30-40 ℃, adding 0.2-0.5 part of calcium chloride, stirring for 0.5-2 hours, filtering, and drying in vacuum to obtain the composite material capable of reducing COD in sewage.
3. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the acid solution is a formic acid solution with the mass concentration of 12%.
4. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the mass concentration of the ammonia water is 20-28%.
5. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the mesh number of the active carbon is 80-200 meshes.
6. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the molecular weight of the chitosan is 5-20 ten thousand, and the deacetylation degree is more than 80%.
7. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: in the mixed solution of water and dimethyl sulfoxide, the mass ratio of water to dimethyl sulfoxide is 1: 1 to 3.
8. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the mass concentration of the glutaraldehyde water solution is 10-20%.
9. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the mass concentration of the sodium hydroxide aqueous solution is 5-15%.
10. The method for preparing the composite material capable of reducing COD in sewage according to claim 2, is characterized in that: the molecular weight of the sodium alginate is 5-10 ten thousand.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110108352 | 2021-01-27 | ||
| CN2021101083529 | 2021-01-27 |
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