CN114455665A - Sewage dephosphorization agent and preparation method thereof - Google Patents
Sewage dephosphorization agent and preparation method thereof Download PDFInfo
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- CN114455665A CN114455665A CN202210084627.4A CN202210084627A CN114455665A CN 114455665 A CN114455665 A CN 114455665A CN 202210084627 A CN202210084627 A CN 202210084627A CN 114455665 A CN114455665 A CN 114455665A
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- 239000010865 sewage Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 47
- 239000003463 adsorbent Substances 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 34
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 32
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 30
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 29
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 27
- 239000011574 phosphorus Substances 0.000 claims abstract description 27
- 238000001035 drying Methods 0.000 claims abstract description 26
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 25
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 21
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 21
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 21
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 17
- 239000010457 zeolite Substances 0.000 claims abstract description 17
- 238000000227 grinding Methods 0.000 claims abstract description 9
- XBDUTCVQJHJTQZ-UHFFFAOYSA-L iron(2+) sulfate monohydrate Chemical compound O.[Fe+2].[O-]S([O-])(=O)=O XBDUTCVQJHJTQZ-UHFFFAOYSA-L 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 16
- 239000003814 drug Substances 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000008394 flocculating agent Substances 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 238000012851 eutrophication Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000005341 metaphosphate group Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
Abstract
The invention relates to the technical field of sewage treatment, in particular to a sewage dephosphorization reagent and a preparation method thereof. The method solves the technical problems of incomplete removal, high drug consumption and the like of biological phosphorus removal, wherein biological phosphorus removal is generally used at present, a flocculating agent is added into water, and then the phosphorus in the water is removed by filtration. A preparation method of a sewage dephosphorization reagent comprises the following steps: s1, material preparation: preparing raw materials of each component according to corresponding weight fractions; s2, placing the ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide in a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide to obtain a reagent A; s3, soaking equivalent activated alumina, zeolite and activated carbon in a sulfuric acid solution, and then drying and grinding into powder to obtain an adsorbent; s4, fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the efficient sewage dephosphorization agent.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage dephosphorization reagent and a preparation method thereof.
Background
Phosphorus is an important nutrient element in the biosphere and has various existing forms such as orthophosphate, metaphosphate and organic phosphorus. Phosphorus is generally considered to be a limiting factor in plant growth. The eutrophication problem of water body can be caused by over-high phosphorus content in water, algae and other plankton can be rapidly propagated due to eutrophication pollution of water body, the dissolved oxygen content of water body is reduced, the water quality is deteriorated, and fishes and other organisms die in large quantity. Once the eutrophication state of the water body is formed, the nutrients in the water body are absorbed by the aquatic organisms to become the components of the organisms, and in the process of decay after the aquatic organisms die, the nutrients are released into the water body and are utilized by the organisms again to form the circulation of plant nutrient substances, thereby intensifying the eutrophication of the water body. The eutrophication pollution of water bodies is very common in the world, and China pays great attention to the eutrophication pollution. The discharge standard of pollutants for municipal wastewater treatment plants (GB 18918-2002) stipulates that the primary A discharge standard of total phosphorus (counted by P) of water for municipal wastewater treatment plants is 0.5 mg/L. Most sewage treatment plants are concerned with phosphorus removal to control the concentration of total phosphorus in the effluent.
For removing phosphorus from sewage, biological phosphorus removal, adding a flocculating agent into water and then filtering to remove phosphorus in the water are commonly used at present, but the problems of incomplete removal, high dosage consumption and the like exist.
Disclosure of Invention
The invention aims to provide a dephosphorization reagent for sewage treatment, which solves the problems in the background technology.
To achieve the above object, the present invention provides the following technical act:
a sewage dephosphorization agent comprises the following raw materials in parts by weight:
60-80 parts of ferrous sulfate
0-20 parts of ferric trichloride
5-10 parts of polyaluminum chloride
0.1 to 1 portion of polyacrylamide
8-15 parts of adsorbent
2-5 parts of settling agent.
As a further scheme of the invention:
a sewage dephosphorization agent comprises the following raw materials in parts by weight:
70 portions of ferrous sulfate
10 portions of ferric trichloride
6.8 parts of polychlorinated polymer
0.2 part of polyacrylamide
13 portions of adsorbent
And 2 parts of a settling agent.
As a further scheme of the invention: the adsorbent is equivalent activated alumina, zeolite powder and activated carbon.
As a further scheme of the invention: the settling agent is iron powder.
A preparation method of a sewage dephosphorization reagent comprises the following steps:
s1, preparing materials: preparing raw materials of each component according to corresponding weight fractions;
s2, placing the ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide in a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide to obtain a reagent A;
s3, soaking equivalent activated alumina, zeolite and activated carbon in a sulfuric acid solution, and then drying and grinding into powder to obtain an adsorbent;
s4, fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the efficient sewage dephosphorization agent.
As a still further scheme of the invention: in step S2, the temperature of the drying is 85-105 degrees celsius.
As a still further scheme of the invention: in step S3, the sulfuric acid solution has a concentration of 2% and a soaking time of 1.5 to 2 hours.
Compared with the prior art, the invention has the beneficial effects that: in the invention, ferrous sulfate, ferric trichloride and soluble salts (such as phosphate) in sewage react to generate granular and insoluble substances. The polyaluminium chloride and the polyacrylamide can bond small solid particles in the wastewater together, and the organic macromolecules can enlarge the solid particles, so that the solid particles sink. The adsorbent can realize the separation of phosphorus from the sewage through physical adsorption, ion exchange or surface precipitation processes. The powdered adsorbent can increase the specific surface area of the adsorbent, and greatly improves the dephosphorization efficiency. Because the polyacrylamide and the settling agent are added, the problems that the particle size of the adsorbent is too small and solid-liquid separation is difficult are effectively solved.
The invention has the advantages that: the method has the advantages that phosphorus removal by multiple mechanisms is applicable to various water qualities, and the method is good in stability and high in removal rate.
The adopted medicament has no toxicity and no secondary pollution.
The flocculation effect is good and the sedimentation velocity is high by adding the sedimentation assisting agent.
And the manufacturing process is simple, and the production cost is low.
Detailed Description
The present invention is described in further detail below by way of examples, which should not be construed as limiting the scope of the invention. All insubstantial improvements and adjustments made based on the technical scheme belong to the protection scope of the invention.
Example 1
60 parts of ferrous sulfate, 20 parts of ferric trichloride, 6.8 parts of polyaluminium chloride, 0.2 part of polyacrylamide, 13 parts of adsorbent and 2 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
Example 2
70 parts of ferrous sulfate, 10 parts of ferric trichloride, 6.8 parts of polyaluminium chloride, 0.2 part of polyacrylamide, 13 parts of adsorbent and 2 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
Example 3
80 parts of ferrous sulfate, 10 parts of ferric trichloride, 6.8 parts of polyaluminium chloride, 0.2 part of polyacrylamide, 13 parts of adsorbent and 2 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
Example 4
70 parts of ferrous sulfate, 10 parts of ferric trichloride, 6 parts of polyaluminium chloride, 1 part of polyacrylamide, 13 parts of adsorbent and 2 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
Example 5
70 parts of ferrous sulfate, 10 parts of ferric trichloride, 6.5 parts of polyaluminium chloride, 0.5 part of polyacrylamide, 13 parts of adsorbent and 2 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
Example 6
70 parts of ferrous sulfate, 10 parts of ferric trichloride, 6.8 parts of polyaluminium chloride, 0.2 part of polyacrylamide, 10 parts of adsorbent and 5 parts of settling agent, wherein the adsorbent is equivalent activated alumina, zeolite powder and activated carbon, and the settling agent is iron powder. Putting ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide into a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, ferric trichloride, polyaluminium chloride and polyacrylamide to obtain a reagent A, wherein the drying temperature is 85-105 ℃; soaking equivalent activated alumina, zeolite and activated carbon in sulfuric acid solution, drying and grinding into powder to obtain adsorbent, wherein the concentration of the sulfuric acid solution is 2%, and the soaking time is 1.5-2 hours; and fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the high-efficiency phosphorus removing agent.
The test method comprises the following steps: the total phosphorus concentration was determined by ammonium molybdate spectrophotometry (GB11893-1989)
TABLE 1
In summary, in the present invention, ferrous sulfate and ferric chloride react with soluble salts (such as phosphate) in sewage to generate granular, insoluble substances. The polyaluminium chloride and the polyacrylamide can bond small solid particles in the wastewater together, and the organic macromolecules can enlarge the solid particles, so that the solid particles sink. The adsorbent can realize the separation of phosphorus from the sewage through physical adsorption, ion exchange or surface precipitation processes. The powdered adsorbent can increase the specific surface area of the adsorbent, and greatly improves the dephosphorization efficiency. Because the polyacrylamide and the settling agent are added, the problems that the particle size of the adsorbent is too small and solid-liquid separation is difficult are effectively solved.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (7)
1. The sewage dephosphorization agent is characterized by comprising the following raw materials in parts by weight:
60-80 parts of ferrous sulfate
10-20 parts of ferric trichloride
5-10 parts of polyaluminum chloride
0.1 to 1 portion of polyacrylamide
8-15 parts of adsorbent
2-5 parts of settling agent.
2. The phosphorus removal agent for sewage as claimed in claim 1, wherein the phosphorus removal agent comprises the following raw materials in parts by weight:
70 portions of ferrous sulfate
10 portions of ferric trichloride
6.8 parts of polyaluminum chloride
0.2 part of polyacrylamide
13 portions of adsorbent
And 2 parts of a settling agent.
3. The reagent of claim 1 or 2, wherein the adsorbent is activated alumina or zeolite powder or activated carbon.
4. The reagent of claim 1 or 2, wherein the precipitation promoter is iron powder.
5. A preparation method of a sewage dephosphorization agent is characterized by comprising the following steps:
s1, preparing materials: preparing raw materials of each component according to corresponding weight fractions;
s2, placing the ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide in a dryer for drying, and fully stirring and mixing the dried ferrous sulfate, the ferric trichloride, the polyaluminium chloride and the polyacrylamide to obtain a reagent A;
s3, soaking activated alumina, zeolite and activated carbon in a sulfuric acid solution, and then drying and grinding into powder to obtain an adsorbent;
s4, fully stirring and mixing the reagent A, the adsorbent and the settling agent to obtain the efficient sewage dephosphorization agent.
6. The method for preparing a phosphorus removal agent for sewage as claimed in claim 5, wherein in step S2, the drying temperature is 85-105 ℃.
7. The method for preparing a phosphorus removal agent for sewage as claimed in claim 5, wherein in step S3, the concentration of said sulfuric acid solution is 2% and the soaking time is 1.5-2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210084627.4A CN114455665A (en) | 2022-01-25 | 2022-01-25 | Sewage dephosphorization agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210084627.4A CN114455665A (en) | 2022-01-25 | 2022-01-25 | Sewage dephosphorization agent and preparation method thereof |
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Family
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| CN202210084627.4A Pending CN114455665A (en) | 2022-01-25 | 2022-01-25 | Sewage dephosphorization agent and preparation method thereof |
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| CN117003328A (en) * | 2023-09-21 | 2023-11-07 | 生态环境部环境规划院 | Odor control agent for wastewater treatment of pesticide contaminated sites and preparation method thereof |
| CN117247161A (en) * | 2023-11-17 | 2023-12-19 | 山东吉昌龙环境工程有限公司 | Efficient dephosphorizing agent based on enzyme preparation |
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Application publication date: 20220510 |