CN112499759B - Nitrogen and phosphorus removal foaming filler and preparation method thereof - Google Patents

Nitrogen and phosphorus removal foaming filler and preparation method thereof Download PDF

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Publication number
CN112499759B
CN112499759B CN202011431903.7A CN202011431903A CN112499759B CN 112499759 B CN112499759 B CN 112499759B CN 202011431903 A CN202011431903 A CN 202011431903A CN 112499759 B CN112499759 B CN 112499759B
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nitrogen
phosphorus removal
foaming
polyurethane
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CN112499759A (en
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陈继锡
王永峰
胡大波
季荣
智锁红
邓东阳
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Quanzhou Institute For Environmental Protection Industry Nanjing University
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Quanzhou Institute For Environmental Protection Industry Nanjing University
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • C02F3/2806—Anaerobic processes using solid supports for microorganisms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0014—Use of organic additives
    • C08J9/0023—Use of organic additives containing oxygen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
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    • C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08J2303/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C08J2375/06—Polyurethanes from polyesters
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
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    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
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    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
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Abstract

The invention relates to a nitrogen and phosphorus removal foaming filler and a preparation method thereof, wherein the nitrogen and phosphorus removal foaming filler is prepared from the following raw materials in parts by weight: 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate; compared with the prior art, the nitrogen and phosphorus removal foaming filler prepared by the invention has the advantages of developed pore structure, autotrophic denitrification and phosphorus removal effects, capability of deeply removing nitrogen and phosphorus in sewage, easiness in cleaning generated sludge, short hydraulic retention time, no hardening phenomenon after long-term use and suitability for industrial popularization.

Description

Nitrogen and phosphorus removal foaming filler and preparation method thereof
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a nitrogen and phosphorus removal foaming filler and a preparation method thereof.
Background
In recent years, with the continuous development of national economy and urbanization, a large amount of nitrogen and phosphorus nutrient salts, organic matters and the like are discharged into surface water, so that water eutrophication and water function decline are caused. Low-pollution water becomes a new difficulty for water environment treatment, and although the water pollution condition in China is improved by national major water special comprehensive treatment, the current water environment ecological safety situation is still not optimistic.
The core of deep nitrogen and phosphorus removal of low-pollution water is the removal of nitrate and inorganic phosphorus. In the prior art, for example, a sewage treatment filler with patent application number 201711176392.7, a preparation method and an application thereof, the phosphorus removal filler disclosed in the patent can effectively remove phosphorus in sewage in a physical adsorption mode, but nitrogen cannot be synchronously removed during phosphorus removal; the patent 201911048309.7 discloses a sewage denitrification and dephosphorization filler and a preparation method thereof, the method comprises the steps of blending iron powder and a carbon source, then molding the mixture by cement, and utilizing the carbon source to generate heterotrophic denitrification effect by culturing heterotrophic denitrifying bacteria so as to remove NO in sewage3 -And the phosphorus element in the sewage is fixed in the form of ferric phosphate salt, thereby achieving the effect of synchronous denitrification and dephosphorization. The patent application number 201810286820.X discloses a low-density nitrogen and phosphorus removal filler and a preparation method thereof, the method mixes calcium, iron, polyacrylic resin and other materials to prepare the nitrogen and phosphorus removal filler, and iron phosphate and calcium phosphate insoluble substances are generated by the filler and phosphorus elements in sewage to effectively remove the phosphorus in the sewage. It can be seen that most of the existing patent technologies adopt the concept of 'heterotrophic denitrification + chemical precipitation phosphorus removal' to remove nitrogen and phosphorus in sewage, and the biggest disadvantage of heterotrophic denitrification is that the dosage of a carbon source is difficult to control, the dosage below the requirement can cause incomplete nitrate treatment, and the dosage above the requirement can increase the sludge production; secondly, the chemical precipitation phosphorus removal has the disadvantages of phosphorus fixation and large mud scraping cost for removing the phosphorus from the waterAnd (4) removing.
The invention adopts solid-phase autotrophic denitrification to remove NO in sewage3 -The ions are converted into nitrogen to be removed, and the calcium phosphate and the iron phosphate generated by the dephosphorization chemical reaction are attached to the foaming filler, so that the nitrogen and phosphorus in the water body can be truly removed.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides a nitrogen and phosphorus removal foaming filler which has a developed pore structure, has autotrophic denitrification and phosphorus removal effects, can deeply remove nitrogen and phosphorus in sewage, generates sludge, is easy to clean, has short hydraulic retention time, and is suitable for industrial popularization, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the nitrogen and phosphorus removal foaming filler is prepared from the following raw materials in parts by weight: 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate;
the method comprises the following steps:
(1) melting and blending 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate by using a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 7-10MPa, introducing the carbon dioxide into the high-pressure reaction kettle, maintaining the pressure for 10-20min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foaming filler.
The further improvement is that: the polyurethane is polyester type, the hardness of the polyurethane is 65A, and the molecular weight of the polyurethane is 10-50 ten thousand.
The further improvement is that: the particle sizes and the meshes of the pyrite powder, the talcum powder, the white carbon black and the zinc stearate are all less than 400 meshes.
Based on the same invention concept, the invention also provides a preparation method of the nitrogen and phosphorus removal foaming filler, which comprises the following steps:
(1) melting and blending 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate by using a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 7-10MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 10-20min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foaming filler.
The further improvement is that: the specific gravity of the nitrogen and phosphorus removal foaming filler is 0.7-0.9g/cm3Tear strength of 30-40N/mm and tensile strength of more than 3N/mm2。
The further improvement is that: the shape of the nitrogen and phosphorus removal foaming filler is cube, and the size of the filler is 20 mm.
After the technical scheme is adopted, the invention has the beneficial effects that: the pyrite provides an electron donor for autotrophic denitrification; the talcum powder and the oyster shell powder provide an inorganic carbon source for the reaction process of autotrophic denitrification, and are cheap and easy to obtain; the white carbon black can improve the shock resistance of the nitrogen and phosphorus removal foaming filler; the viscosity of the polyurethane is higher above the melting point temperature, the polyurethane is not easy to be mixed uniformly and processed, and the zinc stearate can improve the mixing uniformity of the blend and is convenient to process.
Further effects are as follows: the hardness of the polyurethane is 65A, the processing is convenient, and the polyurethane foam material is used as a framework, so that a larger specific surface area and a rich pore structure can be provided to provide a good growth environment for autotrophic denitrifying bacteria; secondly, phosphate generated by the dephosphorization reaction is concentrated in the polyurethane pore channel to facilitate mud cleaning, so that secondary pollution is prevented.
Detailed Description
The invention will now be further illustrated with reference to specific examples.
Example 1:
the nitrogen and phosphorus removal foaming filler is prepared from the following raw materials in parts by weight: 70 parts of polyurethane, 10 parts of oyster shell powder, 10 parts of starch, 5 parts of pyrite powder, 4 parts of talcum powder, 2 parts of white carbon black and 0.5 part of zinc stearate.
In the above examples, the polyurethane is a polyester type having a hardness of 65A and a molecular weight of 10 to 50 ten thousand.
In the above embodiment, the particle sizes and the meshes of the pyrite powder, the talcum powder, the white carbon black and the zinc stearate are all less than 400 meshes.
A preparation method of a nitrogen and phosphorus removal foaming filler comprises the following steps:
(1) 70 parts of polyurethane, 10 parts of oyster shell powder, 10 parts of starch, 5 parts of pyrite powder, 4 parts of talcum powder, 2 parts of white carbon black and 0.5 part of zinc stearate are subjected to melt blending by utilizing a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: and (3) heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 10MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 10min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foamed filler.
In the above embodiment, the specific gravity of the nitrogen and phosphorus removal foaming filler is 0.83g/cm3Tear strength of 31.22N/mm and tensile strength of more than 3.56N/mm2。
In the above embodiment, the shape of the foaming filler for nitrogen and phosphorus removal is cube, and the size of the foaming filler is 20mm by 20 mm.
In the embodiment, pyrite is used for providing an electron donor and an iron source for autotrophic denitrification; the talcum powder and the oyster shell powder provide an inorganic carbon source for the reaction process of autotrophic denitrification, and are cheap and easy to obtain;
the hardness of the selected polyurethane is 65A, so that the polyurethane is convenient to process; the polyurethane foam material is used as a framework, and can provide a large specific surface area and rich pore channel structures to provide a good growth environment for autotrophic denitrifying bacteria; secondly, phosphate generated by the dephosphorization reaction is concentrated in the polyurethane pore channel to facilitate mud cleaning, so that secondary pollution is prevented;
the white carbon black is utilized to improve the shock resistance of the nitrogen and phosphorus removal foaming filler; a small amount of zinc stearate is added to solve the problems that the viscosity of the polyurethane is higher above the melting point temperature, and the polyurethane is not easy to be uniformly mixed and processed.
Example 2:
the nitrogen and phosphorus removal foaming filler is prepared from the following raw materials in parts by weight: 20 parts of polyurethane, 50 parts of oyster shell powder, 30 parts of starch, 20 parts of pyrite powder, 10 parts of talcum powder, 10 parts of white carbon black and 2 parts of zinc stearate.
In the above examples, the polyurethane is a polyester type having a hardness of 65A and a molecular weight of 10 to 50 ten thousand.
In the above embodiment, the particle sizes and the meshes of the pyrite powder, the talcum powder, the white carbon black and the zinc stearate are all less than 400 meshes.
A preparation method of a nitrogen and phosphorus removal foaming filler comprises the following steps:
(1) melting and blending 20 parts of polyurethane, 50 parts of oyster shell powder, 30 parts of starch, 20 parts of pyrite powder, 10 parts of talcum powder, 10 parts of white carbon black and 2 parts of zinc stearate by using a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: and (3) heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 7MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 20min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foamed filler.
In the above embodiment, the specific gravity of the nitrogen and phosphorus removal foaming filler is 0.79g/cm3Tear strength of 35.36N/mm and tensile strength of more than 4.13N/mm2。
In the above embodiment, the shape of the foaming filler for nitrogen and phosphorus removal is cube, and the size of the foaming filler is 20mm by 20 mm.
In the embodiment, pyrite is used for providing an electron donor for autotrophic denitrification; the talcum powder and the oyster shell powder provide an inorganic carbon source for the reaction process of autotrophic denitrification, and are cheap and easy to obtain;
the hardness of the selected polyurethane is 65A, the polyurethane foaming material is convenient to process, and the polyurethane foaming material is used as a framework, so that a large specific surface area and a rich pore structure can be provided, and a good growth environment is provided for autotrophic denitrifying bacteria; secondly, phosphate generated by the dephosphorization reaction is concentrated in the polyurethane pore channel to facilitate mud cleaning, so that secondary pollution is prevented;
the white carbon black is utilized to improve the shock resistance of the nitrogen and phosphorus removal foaming filler; a small amount of zinc stearate is added to solve the problems that the viscosity of the polyurethane is higher above the melting point temperature, and the polyurethane is not easy to be uniformly mixed and processed.
Example 3:
the nitrogen and phosphorus removal foaming filler is prepared from the following raw materials in parts by weight: 45 parts of polyurethane, 30 parts of oyster shell powder, 20 parts of starch, 12 parts of pyrite powder, 7 parts of talcum powder, 6 parts of white carbon black and 1.2 parts of zinc stearate.
In the above examples, the polyurethane is a polyester type having a hardness of 65A and a molecular weight of 10 to 50 ten thousand.
In the above embodiment, the particle sizes and the meshes of the pyrite powder, the talcum powder, the white carbon black and the zinc stearate are all less than 400 meshes.
A preparation method of a nitrogen and phosphorus removal foaming filler comprises the following steps:
(1) using a double screw to melt and blend 45 parts of polyurethane, 30 parts of oyster shell powder, 20 parts of starch, 12 parts of pyrite powder, 7 parts of talcum powder, 6 parts of white carbon black and 1.2 parts of zinc stearate to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: and (3) heating the high-pressure reaction kettle to 150 +/-5 ℃, pressurizing carbon dioxide to 9MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 15min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foamed filler.
In the above embodiment, the specific gravity of the nitrogen and phosphorus removal foaming filler is 0.81g/cm3Tear strength of 33.28N/mm and tensile strength of more than 3.89N/mm2。
In the above embodiment, the shape of the foaming filler for nitrogen and phosphorus removal is cube, and the size of the foaming filler is 20mm by 20 mm.
In the embodiment, pyrite is used for providing an electron donor for autotrophic denitrification; the talcum powder and the oyster shell powder provide an inorganic carbon source for the reaction process of autotrophic denitrification, and are cheap and easy to obtain;
the hardness of the selected polyurethane is 65A, so that the polyurethane is convenient to process; the polyurethane foam material is used as a framework, and can provide a large specific surface area and rich pore channel structures to provide a good growth environment for autotrophic denitrifying bacteria; secondly, phosphate generated by the dephosphorization reaction is concentrated in the polyurethane pore channel to facilitate mud cleaning, so that secondary pollution is prevented;
the white carbon black is utilized to improve the shock resistance of the nitrogen and phosphorus removal foaming filler; a small amount of zinc stearate is added to solve the problems that the viscosity of the polyurethane is higher above the melting point temperature, and the polyurethane is not easy to be uniformly mixed and processed.
The following are experimental values of the density, specific surface area, tear strength and tensile strength of the nitrogen and phosphorus removal foaming filler in the three groups of examples. Wherein, the total nitrogen and the total phosphorus are fillers with the same mass, and the experimental data of the same water quality is processed under the same experimental conditions.
Group of Relative density (g/cm)3） Specific surface area (m)2/g） Tear Strength (N/mm) Tensile Strength (N/mm)2）
Example 1 0.83 1186 31.22 3.56
Example 2 0.79 996 35.36 4.13
Example 3 0.81 1053 33.28 3.89
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are included to illustrate the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The invention is not described in detail, but is well known to those skilled in the art.

Claims (6)

1. A nitrogen and phosphorus removal foaming filler is characterized in that: the composition comprises the following raw materials in parts by weight: 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate;
the method comprises the following steps:
(1) melting and blending 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate by using a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method comprises the following specific steps: heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 7-10MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 10-20min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foaming filler.
2. The nitrogen and phosphorus removal foaming filler of claim 1, wherein: the polyurethane is polyester type, the hardness of the polyurethane is 65A, and the molecular weight of the polyurethane is 10-50 ten thousand.
3. The nitrogen and phosphorus removal foaming filler of claim 1, wherein: the particle sizes and the meshes of the pyrite powder, the talcum powder, the white carbon black and the zinc stearate are all less than 400 meshes.
4. A method for preparing the foaming filler for nitrogen and phosphorus removal as claimed in any one of claims 1 to 3, which comprises the following steps:
(1) melting and blending 20-70 parts of polyurethane, 10-50 parts of oyster shell powder, 10-30 parts of starch, 5-20 parts of pyrite powder, 4-10 parts of talcum powder, 2-10 parts of white carbon black and 0.5-2 parts of zinc stearate by using a double screw to prepare a blend;
(2) foaming the blend in a supercritical kettle pressure foaming manner; the method specifically comprises the following steps: heating the high-pressure reaction kettle to 180 +/-5 ℃, pressurizing carbon dioxide to 7-10MPa, introducing into the high-pressure reaction kettle, maintaining the pressure for 10-20min, and instantly releasing the pressure in the high-pressure reaction kettle to obtain the nitrogen and phosphorus removal foaming filler.
5. The method for preparing the foaming filler for nitrogen and phosphorus removal as claimed in claim 4, wherein: the specific gravity of the nitrogen and phosphorus removal foaming filler is 0.7-0.9g/cm3Tear strength of 30-40N/mm and tensile strength of more than 3N/mm2。
6. The method for preparing the foaming filler for nitrogen and phosphorus removal as claimed in claim 4, wherein: the shape of the nitrogen and phosphorus removal foaming filler is cube, and the size of the filler is 20 mm.
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CN113998781B (en) * 2021-12-31 2022-03-22 河北海鹰环境安全科技股份有限公司 Sewage autotrophic denitrification treatment process
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