CN110697858A - Purifying agent for treating domestic sewage and preparation method thereof - Google Patents
Purifying agent for treating domestic sewage and preparation method thereof Download PDFInfo
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- CN110697858A CN110697858A CN201911015591.9A CN201911015591A CN110697858A CN 110697858 A CN110697858 A CN 110697858A CN 201911015591 A CN201911015591 A CN 201911015591A CN 110697858 A CN110697858 A CN 110697858A
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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
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic 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
- 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
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a purifying agent for treating domestic sewage and a preparation method thereof. A purifying agent for treating domestic sewage at least comprises the following components in parts by weight: 10-30 parts of modified chitosan, 5-15 parts of plant extract, 1-3 parts of nano aluminum powder, 1-5 parts of gel, 0.5-3 parts of metal salt and 50-100 parts of zeolite powder. The purifying agent provided by the invention has the characteristics of strong flocculation capacity, strong phosphorus removal capacity, high efficiency and the like, is particularly suitable for the precipitation of eutrophic sewage with high phosphorus-containing substances and the removal of the phosphorus-containing substances, reduces the production cost of the sewage purifying agent, can be biodegraded, is harmless to the environment, has no secondary pollution, and has important environmental, social and economic benefits.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a purifying agent for treating domestic sewage and a preparation method thereof.
Background
The problem of lake eutrophication has not been recognized by many mechanisms due to its own complexity. At present, the international research on the eutrophication phenomenon of shallow lakes is lack of a mature theory. However, generally speaking, the occurrence of eutrophication in lake water is mainly caused by the increase of nutrient elements such as nitrogen and phosphorus in water. The main source of phosphorus is domestic sewage, particularly in rural areas, because the environmental awareness is relatively thin, the situations of using phosphorus-rich clothes for washing clothes are relatively more, and the phosphorus pollution in the rural river is relatively serious.
The nitrogen and phosphorus contents entering the water body must be controlled to prevent and treat eutrophication, and the temporary solution treatment is realized while the permanent solution treatment is realized by the flocculation precipitation. The invention provides a purifying agent for domestic sewage treatment, which has the characteristics of strong flocculation capacity, strong phosphorus removal capacity, high efficiency and the like, and is particularly suitable for the precipitation of eutrophic sewage with high phosphorus-containing substances and the removal of the phosphorus-containing substances; the flocculant improves the biodegradability of the traditional flocculant, reduces the production cost of the wastewater flocculant, can be recycled, and has important environmental, social and economic benefits.
Disclosure of Invention
In order to solve the above technical problems, a first aspect of the present invention provides a purifying agent for treating domestic sewage, comprising at least the following components in parts by weight: 10-30 parts of modified chitosan, 5-15 parts of plant extract, 1-3 parts of nano aluminum powder, 1-5 parts of gel, 0.5-3 parts of metal salt and 50-100 parts of zeolite powder.
As a preferable technical scheme of the invention, the modified chitosan is sulfhydryl chitosan.
As a preferred technical scheme of the present invention, the plant extract is at least one of green tea extract, eucalyptus leaf extract, clove extract, rhubarb extract, gallnut extract and clove extract.
As a preferred technical scheme of the invention, the plant extract is a combination of green tea extract and clove extract, and the mass ratio of the green tea extract to the clove extract is 1: (0.3-0.8).
As a preferable technical scheme of the invention, the particle size of the nano aluminum powder is 50-60 nm.
In a preferred embodiment of the present invention, the gel is at least one selected from gelatin, agar, and xanthan gum.
In a preferred embodiment of the present invention, the metal salt is at least one of a metal magnesium salt, a metal iron salt, a metal calcium salt, and a metal aluminum salt.
In a preferred embodiment of the present invention, the metal salt is at least one of metal sulfate, metal nitrate, metal acetate, and metal halide.
The second aspect of the invention provides a preparation method of the purifying agent, which at least comprises the following steps:
(1) stirring and mixing the modified chitosan, the nano aluminum powder and the plant extract uniformly, treating for 10-20 minutes under 10-40kHz ultrasonic wave, and taking out; then carrying out far infrared heating technology to ensure that the temperature of the mixture reaches 50-70 ℃, and fully stirring and turning over; spraying 0.05-0.15% of the total weight of the modified chitosan, the nano aluminum powder and the plant extract and 0.1-0.3mol/L of sodium hydroxide solution to ensure that the mixture is fully absorbed, and taking out after 10-20 minutes;
(2) and (2) uniformly mixing the mixture obtained in the step (1), the gel, the metal salt and the zeolite powder to obtain the catalyst.
The third aspect of the invention provides an application of the purifying agent, which can be applied to the treatment of domestic sewage.
Has the advantages that: the invention provides a purifying agent for domestic sewage treatment, which has the characteristics of strong flocculation capacity, strong phosphorus removal capacity, high efficiency and the like, is particularly suitable for the precipitation of eutrophic sewage with high phosphorus-containing substances and the removal of the phosphorus-containing substances, reduces the production cost of the sewage purifying agent, can be biodegraded, is harmless to the environment, has no secondary pollution, and has important environmental, social and economic benefits.
Detailed Description
The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The term "prepared from …" as used herein is synonymous with "comprising". The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. "optional" or "any" means that the subsequently described event or events may or may not occur, and that the description includes instances where the event occurs and instances where it does not.
Approximating language, as used herein throughout the specification and claims, is intended to modify a quantity, such that the invention is not limited to the specific quantity, but includes portions that are literally received for modification without substantial change in the basic function to which the invention is related. Accordingly, the use of "about" to modify a numerical value means that the invention is not limited to the precise value. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. In the present description and claims, range limitations may be combined and/or interchanged, including all sub-ranges contained therein if not otherwise stated.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the stated number clearly indicates that the singular form is intended.
In order to solve the above technical problems, a first aspect of the present invention provides a purifying agent for treating domestic sewage, comprising at least the following components in parts by weight: 10-30 parts of modified chitosan, 5-15 parts of plant extract, 1-3 parts of nano aluminum powder, 1-5 parts of gel, 0.5-3 parts of metal salt and 50-100 parts of zeolite powder.
Preferably, the purifying agent at least comprises the following components in parts by weight: 25 parts of modified chitosan, 10 parts of plant extract, 2 parts of nano aluminum powder, 4 parts of gel, 2 parts of metal salt and 70 parts of zeolite powder.
Modified chitosan
In the invention, the modified chitosan is sulfhydryl chitosan.
The preparation method of the mercapto chitosan comprises the following steps: adding chitosan, 1-hydroxybenzotriazole and distilled water into a reactor, uniformly stirring, adding 2-mercapto-4-methyl-5-thiazoleacetic acid and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, reacting the pH of a reaction solution to 5 by using 1mol/L sodium hydroxide, reacting for 4h at room temperature, adding absolute ethyl alcohol, filtering, drying at 60 ℃ under reduced pressure for 10h, grinding, and storing at 5 ℃ at low temperature; the weight ratio of the chitosan to the 1-hydroxybenzotriazole to the distilled water is 1: 0.7: 30, of a nitrogen-containing gas; the weight ratio of the chitosan to the 2-mercapto-4-methyl-5-thiazoleacetic acid is 1: 3.6; the molar ratio of the 2-mercapto-4-methyl-5-thiazoleacetic acid to the 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride is 1: 1.05; the weight ratio of the chitosan to the absolute ethyl alcohol is 1: 10.
in the invention, the chitosan has stronger complexing and adsorbing capabilities, good mechanical property, stable chemical property and high fixing efficiency. The inventor thinks that the introduction of the sulfhydryl group endows chitosan with new biological characteristics, the activity of the sulfhydryl group is enhanced, and a plurality of disulfide bonds are formed inside the thiolated chitosan molecules, thereby forming a network structure and having remarkable effect on adsorbing biomacromolecule substances. The complexation and adsorption capacity of chitosan molecules after being grafted with sulfydryl is further enhanced, the phosphorus absorption and precipitation capacity of the eutrophic sewage is enhanced, and the flocculation degradation capacity of the chitosan molecules on macromolecular substances in the sewage is improved.
Plant extracts
In the invention, the plant extract is at least one of green tea extract, eucalyptus leaf extract, clove extract, rhubarb extract, gallnut extract and clove extract.
Preferably, the plant extract is a combination of green tea extract and clove extract.
More preferably, the mass ratio of the green tea extract to the clove extract in the plant extract is 1: (0.3-0.8).
Most preferably, the mass ratio of the green tea extract to the clove extract in the plant extract is 1: 0.4.
< Green tea extract >
The green tea is prepared by fermenting, retains natural substances of fresh leaves, and contains more nutrients such as tea polyphenols, catechin, chlorophyll, caffeine, amino acids, vitamins, etc. The natural nutrient components in the green tea have special effects of preventing aging, cancer, resisting cancer, sterilizing, diminishing inflammation and the like. The main components of the tea with pharmacological action are tea polyphenol, caffeine, lipopolysaccharide, theanine and the like.
The preparation method of the green tea extract at least comprises the following steps: a steam distiller was charged with 2kg of tea powder of autumn and winter tea, and 1kg of 35 deg.C water was uniformly dispersed therein, and then left to stand for 10 minutes to moisten. After the completion of the humidification, the pressure was reduced to-54 kPaG by gauge pressure, steam distillation was carried out at SV (space velocity) for 325h-1 to distill off 0.2kg of distillate to obtain steam distillate 1, then the container system was returned to normal pressure to carry out steam distillation at normal pressure to distill off 2kg of distillate, the obtained distillate was used as steam distillate 2, and the steam distillate 1 and the steam distillate 2 were combined and concentrated under reduced pressure until anhydrous to obtain a green tea extract.
< extracts of clove >
Flos Caryophylli, deciduous shrub or arborvitae of Syzygium of Oleaceae. The flower tube is so slender as nail and so named as clove and cloves. Alias: flos Caryophylli (flower bud), fructus Caryophylli (fruit). The bud contains volatile oil, i.e. oleum Caryophylli. The oil mainly contains eugenol, acetosyringol, B-caryophyllene, methyl n-amyl ketone, methyl salicylate, humulene, benzaldehyde, benzyl alcohol, m-methoxybenzaldehyde, benzyl acetate, piperitol, etc. There are also wild species containing no eugenol (normally 64-85% in clove oil) and containing eugenol and eugenol. The flower also contains triterpene compounds such as Oleanolic acid (Oleanolic acid, flavone and paraoxonol rhamnoside), kaempferol, psicosane, isopsigartine and its demethylated compound isoprunol.
The preparation method of the clove extract comprises the following steps: adding 10 times of 85% ethanol by weight into dried flos Caryophylli, ultrasonic extracting for 4h, and concentrating the extractive solution under reduced pressure.
The plant extract can also provide a certain amount of cellulose, sodium carboxymethyl cellulose can be easily formed partially in a weak alkaline environment, the sodium carboxymethyl cellulose can form a co-coacervate with gelatin, and chitosan and aluminum hydroxide can precipitate substances with larger molecular weight during flocculation.
Nano aluminium powder
In the invention, the particle size of the nano aluminum powder is 50-60 nm.
The nano aluminum powder is not particularly limited, and may be purchased from Gaussa nano materials Equipment Co., Ltd, Siping.
The invention mainly adopts the full dispersion and mixing of the modified chitosan and the nano aluminum powder and uses the infrared oxidation technology to fully combine the aluminum powder and the chitosan, and the plant extract can be used as a supplementary substance to strengthen the combination degree; on the other hand, the polyphenol in the plant extract has unique chemical activity and physiological characteristics and the characteristic of complexing with various metal ions, so that metal compounds possibly contained in sewage are removed.
Gel
In the invention, the gel is at least one selected from gelatin, agar and xanthan gum.
Preferably, the gel is gelatin.
Gelatin (Gelatin) is a white or yellowish, semitransparent, slightly lustrous sheet or powder formed by the degradation of collagen in connective tissues such as animal skin, bone, and sarcolemma; so it is also called animal gelatin and fat glue. The industrial gelatin is colorless to light yellow transparent or semitransparent flakes or particles. No smell and no odor. It is expanded by absorbing water in cold water. Dissolved in hot water. Soluble in glycerol and acetic acid, and insoluble in ethanol and diethyl ether.
Gelatin belongs to a macromolecular hydrophilic colloid, is a low-calorie health food with high nutritive value, and can be used for preparing candy additives, frozen food additives and the like. In addition, gelatin is also widely utilized in the pharmaceutical and chemical industries.
In the present invention, the gelatin is not particularly limited, and is commercially available from Hengshui Wanding gelatin Tech Co.
Metal salt
In the present invention, the metal salt is at least one of a metal magnesium salt, an iron salt, a calcium salt, and an aluminum salt.
Preferably, the metal salt is at least one of metal sulfate, metal nitrate, metal acetate and metal halide.
More preferably, the metal salt is magnesium chloride.
Zeolite powder
The zeolite powder is prepared by grinding natural zeolite rock, and has light green and white color.
In the present invention, the zeolite powder is not particularly limited, and is commercially available from Shijiazhuang Changfa mineral products Co.
In the present invention, the magnesium chloride functions to provide metal magnesium ions. After nitrogen and phosphorus in the sewage are gathered to a certain degree under the electrochemical action, the nitrogen and phosphorus can be combined with zeolite in the purifying agent in a solution to quickly form struvite precipitate.
A second aspect of the present invention provides a method for preparing the scavenger as described above, comprising at least the steps of:
(1) stirring and mixing the modified chitosan, the nano aluminum powder and the plant extract uniformly, treating for 10-20 minutes under 10-40kHz ultrasonic wave, and taking out; then carrying out far infrared heating technology to ensure that the temperature of the mixture reaches 50-70 ℃, and fully stirring and turning over; spraying 0.05-0.15% of the total weight of the modified chitosan, the nano aluminum powder and the plant extract and 0.1-0.3mol/L of sodium hydroxide solution to ensure that the mixture is fully absorbed, and taking out after 10-20 minutes;
(2) and (2) uniformly mixing the mixture obtained in the step (1), the gel, the metal salt and the zeolite powder to obtain the catalyst.
In the invention, a series of chemical reactions are generated in the process of spraying the sodium hydroxide alkali solution, and mainly local strong basicity can promote organic fusion of the sulfhydryl chitosan, the nano aluminum powder and various substances in the plant extract, improve the phosphorus removal performance of the purifying agent, remarkably strengthen the flocculation effect and remarkably strengthen the targeted absorption effect on phosphorus substances.
A third aspect of the present invention provides a use of the above-mentioned purifying agent, which is applicable to treatment of domestic sewage.
In the invention, the method for treating domestic sewage by using the purifying agent comprises the following steps: 0.05-1.5% (g/100mL) of a purifying agent is added into the domestic sewage, and the flocculation treatment is carried out by adopting an electric flocculation method.
The electroflocculation process may employ techniques well known to those skilled in the art.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
In addition, the starting materials used are all commercially available, unless otherwise specified.
Examples
Example 1
Example 1 provides a purifying agent for treating domestic sewage, comprising at least the following components in parts by weight: 25 parts of mercapto chitosan, 10 parts of plant extract, 2 parts of nano aluminum powder, 4 parts of gelatin, 2 parts of magnesium chloride and 70 parts of zeolite powder; the plant extract is a combination of a green tea extract and a clove extract, and the mass ratio of the green tea extract to the clove extract is 1: 0.4.
the preparation method of the mercapto chitosan comprises the following steps: adding chitosan, 1-hydroxybenzotriazole and distilled water into a reactor, uniformly stirring, adding 2-mercapto-4-methyl-5-thiazoleacetic acid and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, reacting the pH of a reaction solution to 5 by using 1mol/L sodium hydroxide, reacting for 4h at room temperature, adding absolute ethyl alcohol, filtering, drying at 60 ℃ under reduced pressure for 10h, grinding, and storing at 5 ℃ at low temperature; the weight ratio of the chitosan to the 1-hydroxybenzotriazole to the distilled water is 1: 0.7: 30, of a nitrogen-containing gas; the weight ratio of the chitosan to the 2-mercapto-4-methyl-5-thiazoleacetic acid is 1: 3.6; the molar ratio of the 2-mercapto-4-methyl-5-thiazoleacetic acid to the 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride is 1: 1.05; the weight ratio of the chitosan to the absolute ethyl alcohol is 1: 10.
the preparation method of the green tea extract comprises the following steps: a steam distiller was charged with 2kg of tea powder of autumn and winter tea, and 1kg of 35 deg.C water was uniformly dispersed therein, and then left to stand for 10 minutes to moisten. After the completion of the humidification, the pressure was reduced to-54 kPaG by gauge pressure, steam distillation was carried out at SV (space velocity) for 325h-1 to distill off 0.2kg of distillate to obtain steam distillate 1, then the container system was returned to normal pressure to carry out steam distillation at normal pressure to distill off 2kg of distillate, the obtained distillate was used as steam distillate 2, and the steam distillate 1 and the steam distillate 2 were combined and concentrated under reduced pressure until anhydrous to obtain a green tea extract.
The preparation method of the clove extract comprises the following steps: adding 10 times of 85% ethanol by weight into dried flos Caryophylli, ultrasonic extracting for 4h, and concentrating the extractive solution under reduced pressure.
The nano aluminum powder is purchased from Gaussda nano materials Equipment Co., Ltd, Siping.
The gelatin was purchased from Hengshui Wanding gelatin science and technology Co.
The zeolite powder is purchased from Shijiazhuang Changfeng mineral products Co.
The preparation method of the purifying agent comprises the following steps:
(1) uniformly stirring and mixing the modified chitosan, the nano aluminum powder and the plant extract, treating for 20 minutes under 30kHz ultrasonic waves, and taking out; then, carrying out far infrared heating technology to ensure that the temperature of the mixture reaches 70 ℃, and fully stirring and turning; spraying 0.1% of sodium hydroxide solution with the concentration of 0.3mol/L, which is based on the total weight of the modified chitosan, the nano aluminum powder and the plant extract, so that the mixture is fully absorbed, and taking out after 20 minutes;
(2) and (2) uniformly mixing the mixture obtained in the step (1), gelatin, magnesium chloride and zeolite powder to obtain the composite material.
Example 2
Example 2 differs from example 1 in that the scavenger comprises at least the following components in parts by weight: 10 parts of sulfhydryl chitosan, 5 parts of plant extract, 1 part of nano aluminum powder, 1 part of gelatin, 0.5 part of magnesium chloride and 50 parts of zeolite powder; the plant extract is the combination of green tea extract and clove extract, and the mass ratio is 1: 0.3.
example 3
Example 3 differs from example 1 in that the scavenger comprises at least the following components in parts by weight: 30 parts of mercapto chitosan, 15 parts of plant extract, 3 parts of nano aluminum powder, 5 parts of gelatin, 3 parts of magnesium chloride and 100 parts of zeolite powder; the plant extract is the combination of green tea extract and clove extract, and the mass ratio is 1: 0.8.
example 4
Example 4 differs from example 1 in that the mercaptochitosan is changed to chitosan; the chitosan is purchased from chemical technology ltd of beibeibei, denna.
Example 5
Example 5 differs from example 1 in that no plant extract is included.
Example 6
Example 6 differs from example 1 in that the plant extract is green tea extract.
Example 7
Example 7 differs from example 1 in that the plant extract is clove extract.
Example 8
Example 8 differs from example 1 in that nano-aluminum powder is not included.
Example 9
Example 9 differs from example 1 in that the metal salt is ferric chloride.
Performance testing
Phosphorus removal rate
9000mL of domestic sewage is averagely divided into 9 parts, 0.5g of the purifying agent prepared in the examples 1-9 is respectively added, and the flocculating settling treatment is carried out by adopting an electric flocculation method; the method for detecting the content of phosphorus in the solution adopts a phosphomolybdic acid quinoline titration analysis method. Phosphorus removal rate ═ phosphorus concentration before treatment-phosphorus concentration after treatment)/phosphorus concentration before treatment ] × 100%.
The test data are shown in table 1.
TABLE 1 phosphorus removal of the scavengers prepared in examples 1-9
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. A purifying agent for treating domestic sewage is characterized by at least comprising the following components in parts by weight: 10-30 parts of modified chitosan, 5-15 parts of plant extract, 1-3 parts of nano aluminum powder, 1-5 parts of gel, 0.5-3 parts of metal salt and 50-100 parts of zeolite powder.
2. The purifying agent as claimed in claim 1, wherein the modified chitosan is mercapto chitosan.
3. The purifying agent as claimed in claim 1, wherein the plant extract is at least one of green tea extract, eucalyptus extract, clove extract, rhubarb extract, gallnut extract and clove extract.
4. The purifying agent as claimed in claim 3, wherein the plant extract is a combination of green tea extract and clove extract, and the mass ratio of the green tea extract to the clove extract is 1: (0.3-0.8).
5. The purifying agent as claimed in claim 1, wherein the particle size of the nano aluminum powder is 50-60 nm.
6. The purifying agent as claimed in claim 1, wherein the gel is at least one selected from gelatin, agar and xanthan gum.
7. The purifying agent according to claim 1, wherein the metal salt is at least one of metal magnesium salt, iron salt, calcium salt and aluminum salt.
8. The purifying agent as claimed in claim 7, wherein the metal salt is at least one of metal sulfate, nitrate, acetate and halide.
9. A method for preparing a purifying agent according to any one of claims 1 to 8, characterized in that it comprises at least the following steps:
(1) stirring and mixing the modified chitosan, the nano aluminum powder and the plant extract uniformly, treating for 10-20 minutes under 10-40kHz ultrasonic wave, and taking out; then carrying out far infrared heating technology to ensure that the temperature of the mixture reaches 50-70 ℃, and fully stirring and turning over; spraying 0.05-0.15% of the total weight of the modified chitosan, the nano aluminum powder and the plant extract and 0.1-0.3mol/L of sodium hydroxide solution to ensure that the mixture is fully absorbed, and taking out after 10-20 minutes;
(2) and (2) uniformly mixing the mixture obtained in the step (1), the gel, the metal salt and the zeolite powder to obtain the catalyst.
10. Use of a purification agent according to any one of claims 1 to 8, for treatment of domestic sewage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113087028A (en) * | 2021-02-25 | 2021-07-09 | 苏州威德姆生态科技有限公司 | Endogenous phosphorus passivation material and method for repairing eutrophic water body by using same |
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