CN115159669A - Aerobic suspension carrier and preparation method thereof - Google Patents
Aerobic suspension carrier and preparation method thereof Download PDFInfo
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- CN115159669A CN115159669A CN202210736968.5A CN202210736968A CN115159669A CN 115159669 A CN115159669 A CN 115159669A CN 202210736968 A CN202210736968 A CN 202210736968A CN 115159669 A CN115159669 A CN 115159669A
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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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/101—Arranged-type packing, e.g. stacks, arrays
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- C—CHEMISTRY; METALLURGY
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- C02F3/02—Aerobic processes
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- C02F3/105—Characterized by the chemical composition
- C02F3/106—Carbonaceous materials
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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Abstract
The invention relates to an aerobic suspension carrier and a preparation method thereof, wherein 4-20 parts of modified biochar and 1-10 parts of carboxymethyl chitosan are uniformly mixed and granulated according to parts by weight to obtain particles A; uniformly mixing the obtained particles A with 100-200 parts by weight of polymer resin particles, and granulating to obtain particles B; and (3) performing screw extrusion molding, cooling and cutting on the obtained particles B at the temperature of 130-170 ℃ to obtain the aerobic suspension carrier. The aerobic suspension carrier prepared by the invention can ensure the full mixing of all raw materials, fully utilizes the adsorption characteristic of the modified charcoal to load the carboxymethyl chitosan on the charcoal, and finally utilizes the carboxymethyl chitosan adsorbed by the modified charcoal to gradually release functional groups such as amino groups and the like, thereby accelerating the enrichment of nitrobacteria.
Description
Technical Field
The invention relates to an aerobic suspension carrier and a preparation method thereof, in particular to an aerobic suspension carrier for promoting enrichment of nitrobacteria and a preparation method thereof, and belongs to the field of biological sewage treatment.
Background
The moving bed biofilm reactor technology is more and more widely applied in the field of sewage treatment after being successfully developed in the end of the 80 th 20 th century, and the initial function of degrading organic matters in wastewater is gradually developed into the development directions of carbon removal and denitrification, deep denitrification and the like. The development and development of suspended filler as the place where the microorganism depends on existence is a key technology for the development of the moving bed biofilm reactor, and the quality and the performance of the suspended filler are closely related to the treatment effect of the moving bed biofilm reactor. However, the mainstream suspension carrier produced in China at present directly processes and forms high molecular material polyethylene or polypropylene, and does not specifically design and modify the characteristics and growth requirements of microorganisms. The suspended carrier produced in the market has the disadvantages of low biofilm formation speed, poor biological affinity, easy falling of a biological membrane, low denitrification efficiency and long start time, so that the operation of a sewage treatment system is unstable, the treatment effect is poor, and the application of the suspended carrier is limited to a certain extent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of an aerobic suspension carrier so as to obtain the aerobic suspension carrier with better film forming effect; the second purpose of the invention is to provide an aerobic suspension carrier.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a preparation method of an aerobic suspension carrier comprises the following steps:
s1, uniformly mixing 4-20 parts of modified biochar and 1-10 parts of carboxymethyl chitosan by weight, and granulating to obtain a particulate matter A;
s2, uniformly mixing the particulate matter A obtained in the S1 with 100-200 parts by weight of polymer resin particles, and granulating to obtain particulate matter B;
and S3, carrying out screw extrusion molding on the granular material B obtained in the step S2 at the temperature of 130-170 ℃, cooling and cutting to obtain the aerobic suspension carrier.
Further, the preparation method of the modified biochar comprises the following steps:
(1) Providing biochar with the particle size of 1-2mm and the pore diameter of 3-10nm;
(2) Soaking the biochar in an organic acid solution for 18-30h, and carrying out solid-liquid separation to obtain a slag phase substance and a liquid phase substance;
wherein the organic acid solution is acrylic acid solution or butenoic acid solution; stirring for 8-12min every 2h while soaking;
(3) Soaking the residue phase in 1-5wt% carboxymethyl chitosan solution for 2-4h, filtering, and drying to obtain modified charcoal;
wherein the solid-liquid mass ratio of the slag phase substance to the carboxymethyl chitosan solution is 2-3.
Further, in the step (2), the concentration of the organic acid in the organic acid solution is 0.05-0.2mol/L.
The applicant researches and discovers that the biochar with the particle size of 1-2mm and the pore diameter of 3-10nm is beneficial to adsorbing carboxymethyl chitosan molecules in the process of modifying the biochar.
Through the soaking treatment of the specific organic acid solution, the hydroxyl functional group and the carbonyl functional group in the organic acid can be grafted to the surface of the biochar, so that the biocompatibility of the biochar surface is improved.
Further, the preparation method of the biochar comprises the following steps:
providing a biomass powder;
sieving the biomass powder by a 100-200 mesh sieve, and drying for 2-12 hours at the temperature of 60-80 ℃;
and pyrolyzing the dried biomass powder at 500-800 ℃ for 60-120min to obtain the biochar.
Further, the biomass powder comprises one or more of shell powder, agricultural and forestry waste powder and chaff powder.
Further, in the step (3), a sieve with 100-200 meshes is adopted for filtering.
Further, the particle size of the particles A is 3-5mm; the particle diameter of the polymer resin particles is 3-5mm.
Further, the particle size of the particulate matter B is 3-5mm.
Further, in S2, the molecular weight of the polymer resin is 100000-250000. The applicant researches and discovers that the adoption of the high molecular resin with the molecular weight range is beneficial to forming a porous structure, ensures the density of a suspension carrier and is beneficial to blending and forming among raw materials.
Further, in S2, the polymer resin is polyethylene and/or polypropylene.
Further, in S3, the particles B obtained in S2 are subjected to screw extrusion molding at 135-165 ℃.
Further, in S3, after cutting, airing in a dry environment or drying at 60-80 ℃ to obtain the aerobic suspension carrier.
Optionally, the shape of the aerobic suspension carrier is cylindrical.
An aerobic suspension carrier is prepared by the preparation method.
The aerobic suspension carrier has high surface biological affinity, high removal efficiency of organic matters and ammonia nitrogen, simple and convenient production method and low cost. The invention utilizes the amino functional group loaded on the surface of the carboxymethyl chitosan to improve the biological affinity of the aerobic suspension carrier to the nitrobacteria and accelerate the growth of the nitrobacteria; secondly, the antibacterial property of carboxymethyl chitosan is utilized to inhibit the growth of other bacteria, so that the directional enrichment of the carrier to nitrobacteria is improved; meanwhile, the adsorption property and the surface functional group of the modified biochar are utilized to promote the removal effect of the organic pollutants difficult to degrade in the sewage. The invention can effectively solve the problems of long aerobic suspended filler film forming time, low nitrobacteria load abundance, poor removal effect of refractory organics and the like in the upgrading and modifying process of the traditional municipal sewage treatment plant.
According to the invention, the carboxymethyl chitosan and the modified biochar are mixed and granulated firstly, and then the obtained granules and the polymer resin granules are mixed and granulated, so that the raw materials with different dosages are fully and uniformly mixed, the effects of substances with relatively small addition amount such as the carboxymethyl chitosan and the modified biochar are fully exerted, and the film forming quality of a carrier medium is improved. The invention provides a method for directionally enriching and culturing carboxymethylchitosan by using amino groups of carboxymethylchitosan as nitrobacteria matrix, which fully promotes enrichment and growth of nitrobacteria on the surface of a carrier, has stronger inhibition effect on other bacterial microorganisms of non-nitrobacteria, ensures rapid enrichment of the nitrobacteria on the surface of the carrier, shortens the starting and biofilm formation time of the carrier, maintains the nitrobacteria in dominant bacterial status all the time by using a biofilm on the surface of the carrier, and has nitrobacteria abundance 3-20 times higher than that of nitrobacteria in the traditional activated sludge system.
Compared with the prior art, the invention has the following beneficial effects:
(1) The surface of the aerobic suspension carrier has functional groups such as amino groups and the like, has strong biological affinity to nitrobacteria, promotes the attachment and growth of the nitrobacteria, and improves the abundance of the nitrobacteria in a biological membrane.
(2) The aerobic suspension carrier is doped with carboxymethyl chitosan, and the growth of microorganisms such as bacteria except nitrobacteria can be effectively inhibited by utilizing the antibacterial property of the carboxymethyl chitosan, so that the aerobic suspension carrier has the function of directionally enriching the nitrobacteria.
(3) The aerobic suspension carrier prepared by the invention can ensure the full mixing of all raw materials, fully utilize the adsorption characteristic of the modified biochar to load the carboxymethyl chitosan on the biochar, and finally utilize the carboxymethyl chitosan adsorbed by the modified biochar to gradually release functional groups such as amino groups and the like, thereby accelerating the enrichment of nitrobacteria.
(4) According to the aerobic suspension carrier disclosed by the invention, in the operation stage of an aerobic tank of a sewage treatment process, the carboxymethyl chitosan on the surface of the aerobic suspension carrier can be gradually dissolved and released, and a porous structure which is coarser than that of a suspension carrier without a film can be formed on the surface of the aerobic suspension carrier along with the lapse of time, so that the specific surface area of the suspension carrier can be increased, and the enrichment effect of the carrier on nitrobacteria can be enhanced.
(5) The aerobic suspension carrier is convenient to process and high in cost performance.
Drawings
FIG. 1 is a schematic diagram of an aerobic suspension carrier according to example 1 of the present invention.
FIG. 2 is a histogram of the structure of horizontal colonies of aerobic biofilm sludge when domestic sewage treatment is carried out using the aerobic suspension carrier of example 1, wherein S0 inoculates the sludge; s1, biofilm formation for 25 days.
FIG. 3 is a schematic diagram of an aerobic suspension carrier before biofilm formation (left panel) and 15 days before biofilm formation (right panel) in example 2.
FIG. 4 is a graph of the difference in microbial population structure between the suspension vehicle of example 2 and the vehicle of other formulations.
FIG. 5 is a Scanning Electron Microscope (SEM) image (magnification 10000 times) of the aerobic suspension carrier of example 2 before and after biofilm formation
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
Taking 1 kg of polyethylene particles, 0.1 kg of modified biochar with the fineness of 100 meshes and 0.04 kg of carboxymethyl chitosan, uniformly mixing the modified biochar and the carboxymethyl chitosan, and granulating to obtain a granular material A with the grain diameter of 3mm, wherein the grain diameter of the polyethylene particles is 3mm; adding the particles A and polyethylene particles into a mixer, mixing uniformly, and processing into particles B with the particle size of 4mm in a granulator at the temperature of 140 ℃; adding the particles B into a screw extruder, controlling the temperatures of a feeding section, a hot melting section and a die section to be 50 ℃, 145 ℃ and 135 ℃, respectively, extruding the raw materials from the extruder, feeding the extruded raw materials into a vacuum box, performing negative pressure suction through a vacuum pump to prepare a pipe with the diameter of 10mm, cooling the pipe through a cooling tank, and cutting the pipe into aerobic suspension carriers with the length of 10mm, wherein the density of the aerobic suspension carriers is 0.95g/cm 3 The prepared aerobic suspension carrier is shown in figure 1.
Wherein the polyethylene has a molecular weight of 100000-250000; the preparation method of the modified biochar comprises the following steps:
(1) Providing biochar with the particle size of 1-2mm and the pore diameter of 3-5 nm;
(2) Soaking the biochar in an organic acid solution for 24 hours, and carrying out solid-liquid separation to obtain a slag phase substance and a liquid phase substance;
wherein the organic acid solution is 0.1mol/L acrylic acid solution; stirring for 10min every 2h while soaking;
(3) Soaking the residue phase in a carboxymethyl chitosan solution with the concentration of 1wt% for 3 hours, filtering by adopting a 150-mesh screen, and drying to obtain modified biochar;
wherein the solid-liquid mass ratio of the slag phase substance to the carboxymethyl chitosan solution is 2.
The preparation method of the biochar comprises the following steps:
providing chaff biomass powder;
sieving the chaff biomass powder by a 150-mesh sieve, and drying for 6 hours at 70 ℃;
and pyrolyzing the dried biomass powder for 120 minutes at 650 ℃ to obtain biochar.
The aerobic suspension carrier prepared in the embodiment is subjected to a solid surface Zeta potential test experiment, and the test result shows that: when the electrolyte is neutral, the Zeta potential on the surface of the biological carrier is +35mV, which indicates that the surface of the aerobic suspension carrier has positive electricity.
And (3) carrying out a contact angle test on the prepared aerobic suspension carrier, wherein the test result shows that: the contact angle of the surface of the aerobic suspension carrier is 23 degrees, which shows that the surface of the suspension carrier has stronger hydrophilicity.
Comparative example 1
Example 1 was repeated with the only difference that: and directly extruding and molding the polyethylene particles through a screw to obtain the polyethylene suspension carrier.
The suspended carriers with the same shape and quantity prepared in the example 1 and the comparative example 1 are respectively added into a domestic sewage SBR reactor, the same amount of inorganic matters such as ammonium bicarbonate and the like are added into the treated domestic sewage, the concentration of the ammonia nitrogen in the inlet water is controlled to be 100-500mg/L, and a biofilm formation comparison test for 30 days is carried out by adopting an intermittent inlet water treatment mode and a regular sludge discharge mode.
The test result shows that: the time required for the aerobic suspension carrier to form the membrane is shortened by 6 to 10 days compared with the time required for the polyethylene suspension carrier in the comparative example 1, which shows that the bioaffinity type aerobic suspension carrier prepared by the invention has good membrane forming performance.
When the aerobic suspension carrier in the embodiment 1 is adopted for domestic sewage treatment, a small amount of nitrite is accumulated in the enrichment process, and the specific degradation rate of ammonia nitrogen is 17.14mgNH 4 + -N.(gVSS) -1 .h -1 The removal rate of ammonia nitrogen is more than 99.9 percent. The nitrifying bacteria in the biological membrane are increased from 0.5% to 16.3% of the inoculated sludge, and the high-throughput sequencing inoculation is shown in figure 2. Meanwhile, according to the result of biodiversity before and after biofilm formation, the ammonia nitrogen is oxidized and the nitrite is generatedThe oxidation capability of acid salt is obviously improved, the diversity of microbial communities in the SBR reactor added with the aerobic suspension carrier is in a descending trend, and the abundance value of nitrifying bacteria is improved, as shown in the table 1.
TABLE 1 microbial diversity parameters before and after biofilm sludge biofilm formation
Example 2
Taking 10 kg of 3-5mm polyethylene particles, 1 kg of modified biochar with the fineness of 100 meshes and 0.5 kg of carboxymethyl chitosan with the particle diameter of 0.2 mm; uniformly mixing carboxymethyl chitosan and modified biochar, and adding the mixture into a granulator to prepare a granular material A with the particle size of 3-5mm at the temperature of 145 ℃; fully and uniformly mixing the particles A and polyethylene particles, placing the particles A and polyethylene particles in a granulator at the temperature of 145 ℃ to prepare particles B with the particle size of 4mm, adding the particles B into a screw extruder, controlling the temperatures of a feeding section, a hot melting section and a die section to be 50 ℃, 150 ℃ and 140 ℃, extruding the particles B from the screw extruder, then feeding the particles B into a vacuum box, performing negative pressure suction through a vacuum pump to prepare a pipe with the diameter of 10mm, cooling the pipe through a cooling tank, and then cutting the pipe into aerobic suspension carriers with the length of 10mm, wherein the density of the aerobic suspension carriers is 0.96g/cm 3 。
The preparation method of the modified biochar comprises the following steps:
(1) Providing biochar with the particle size of 1-2mm and the pore diameter of 3-5 nm;
(2) Soaking the biochar in an organic acid solution for 24 hours, and carrying out solid-liquid separation to obtain a slag phase substance and a liquid phase substance;
wherein the organic acid solution is 0.1mol/L acrylic acid solution; stirring for 10min every 2h while soaking;
(3) Soaking the residue phase in a 2wt% carboxymethyl chitosan solution for 3 hours, filtering by using a 150-mesh screen, and drying to obtain modified charcoal;
wherein the solid-liquid mass ratio of the slag phase substance to the carboxymethyl chitosan solution is 3.
The preparation method of the biochar comprises the following steps:
providing chaff biomass powder;
sieving the chaff biomass powder by using a 150-mesh sieve, and drying for 6 hours at the temperature of 70 ℃;
and pyrolyzing the dried biomass powder for 120 minutes at 650 ℃ to obtain biochar.
The contact angle test of the aerobic suspension carrier prepared in the embodiment shows that: the contact angle of the surface of the biological carrier is 77 degrees, which indicates that the surface of the suspension carrier has stronger hydrophilicity.
Comparative example 2
Example 1 was repeated with the only difference that: directly extruding and molding polyethylene through a screw rod to obtain the polyethylene suspension carrier.
The suspended carriers with the same shape and quantity prepared in the example 2 and the comparative example 2 are respectively added into the domestic sewage SBR aerobic reactor, and a biofilm formation contrast test is carried out by adopting an intermittent water inlet treatment operation mode.
The results show that: the time required for the aerobic suspension carrier to form the membrane is shortened by 5-15 days compared with the time required for the polyethylene suspension carrier to form the membrane in comparative example 2, which shows that the aerobic suspension carrier prepared by the invention has excellent membrane forming performance, as shown in fig. 3.
Comparative example 3
Example 1 was repeated with the only difference that: directly mixing the polyethylene particles and the modified biochar uniformly without adding carboxymethyl chitosan, and granulating.
Comparative example 4
Example 1 was repeated with the only difference that: directly mixing the polyethylene particles and the carboxymethyl chitosan uniformly without adding modified biochar, and granulating.
Comparative example 5
Example 1 was repeated with the only difference that: when the biochar is modified, the slag phase is not soaked in a carboxymethyl chitosan solution and is directly dried.
The biofilm formation test of the aerobic suspension carriers with different formulas is carried out by respectively adding the suspension carriers of example 1, comparative example 1 and comparative examples 3-5 into an SBR aerobic reactor with the volume of 8L to carry out the biofilm formation test for 30 days, wherein the sewage adopted in the biofilm formation test is actual domestic sewage, the ammonia nitrogen concentration is 20-45mg/L, the COD concentration is 100-150mg/L, the C/N ratio of the domestic sewage is 3.0-5.0, the biofilm formation effect of the comparative test is shown in a table 2, and the microbial population structure among different carriers and inoculated sludge is shown in a figure 4.
TABLE 2 comparison of biofilm formation effect of aerobic suspension carriers with different formulations
Example 3: comparison test of different-aperture biochar adsorbing carboxymethyl chitosan
In this embodiment, the preparation method of the modified biochar comprises the following steps:
(1) Providing three biochar with particle size of 1-2mm and different pore diameters (biochar A: pore diameter of 0.5-2.5nm; biochar B: pore diameter of 3-10nm; and biochar C: pore diameter of 11-50 nm);
(2) Respectively soaking the biochar in an organic acid solution for 24 hours, and then respectively carrying out solid-liquid separation to obtain a slag phase substance A, a slag phase substance B and a slag phase substance C;
wherein the organic acid solution is 0.1mol/L acrylic acid solution; stirring for 10min every 2h while soaking;
(3) Respectively taking 1g of a slag phase substance A, a slag phase substance B and a slag phase substance C, respectively mixing the slag phase substances A, B and C with 100mL of 1wt% carboxymethyl chitosan solution, and magnetically stirring for 2h; and (3) at the beginning and the end of magnetic stirring, taking 5mL of water sample for filtering, and measuring the concentration of carboxymethyl chitosan in the water sample by an acetylacetone method under an ultraviolet spectrophotometer after the water sample is filtered.
The results of the adsorption test of carboxymethyl chitosan on different charcoal samples are shown in table 1. As can be seen from Table 1, when the pore diameter of the biochar is 3-10nm, the adsorption effect is obviously better than that of biochar with other pore diameter conditions. The adsorption rate is calculated by the formula: a. The t ＝(C 0 -C t )*100/C 0 Wherein A is t The adsorption rate (%) of the biochar at time t, C 0 The carboxymethyl chitosan concentration (mg/L) at the beginning of adsorption, C t The data in the table are calculated from the last 1 sampling measurement as the concentration (mg/L) of carboxymethyl chitosan at time t.
TABLE 1
| Sample type | Biochar A | Charcoal B | Charcoal C |
| Aperture (nm) | 0.5-2.5 | 3-10 | 11-50 |
| Adsorption Capacity (mg/g) | 255.8 | 839.3 | 743.4 |
| Adsorption Rate (%) | 25.6 | 83.9 | 74.3 |
Example 4: contrast test for adsorbing carboxymethyl chitosan by modified charcoal under different solid-liquid mass ratios
In this embodiment, the preparation method of the modified biochar includes the following steps:
(1) Providing biochar with the particle size of 1-2mm and the pore diameter of 3-10nm;
(2) Soaking the biochar in an organic acid solution for 24 hours, and then respectively carrying out solid-liquid separation to obtain slag phase substances;
wherein the organic acid solution is 0.1mol/L acrylic acid solution; stirring for 10min every 2h while soaking;
(3) Mixing the slag phase substance and the carboxymethyl chitosan solution in 5 conical flasks with the volume ratio of solid to liquid being different and 150 mL; wherein, the solid-liquid mass ratio of the slag phase material to the carboxymethyl chitosan solution in each erlenmeyer flask is A (1;
the concentration of the carboxymethyl chitosan solution in the five conical flasks is 1%;
(4) Respectively placing the five conical flasks on a magnetic stirrer, stirring for 2 hours, and performing solid-liquid separation to obtain modified biochar;
wherein, 5mL of water samples are respectively taken at the beginning and the end of the magnetic stirring for filtering, and the concentration of the carboxymethyl chitosan is measured by the acetylacetone method under an ultraviolet spectrophotometer after the filtering.
In addition, after the test is finished, the contact angles of the five modified biochar (A-E) are respectively measured after the five modified biochar are dried, and meanwhile, the solid recovery rate of the modified biochar is detected, so that the hydrophilicity and the solid-liquid separation effect of the five modified biochar are analyzed.
The results of the adsorption test of the biochar to the carboxymethyl chitosan under different solid-liquid mass ratios are shown in table 2. As can be seen from Table 2, when the solid-liquid mass ratio is 2-3. In addition, the solid-liquid separation effect of the modified biochar and the carboxymethyl chitosan is the best under the condition that the solid-liquid mass ratio is 2-3. Thus, the modified biochar: the optimal solid-liquid mass ratio of the carboxymethyl chitosan solution is determined to be 2-3.
TABLE 2
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (10)
1. The preparation method of the aerobic suspension carrier is characterized by comprising the following steps:
s1, uniformly mixing 4-20 parts of modified biochar and 1-10 parts of carboxymethyl chitosan by weight, and granulating to obtain a particulate matter A;
s2, uniformly mixing the particulate matter A obtained in the S1 with 100-200 parts by weight of polymer resin particles, and granulating to obtain particulate matter B;
and S3, carrying out screw extrusion molding on the particles B obtained in the step S2 at the temperature of 130-170 ℃, cooling and cutting to obtain the aerobic suspended carrier.
2. The preparation method according to claim 1, wherein the preparation method of the modified biochar comprises the following steps:
(1) Providing biochar with the particle size of 1-2mm and the pore diameter of 3-10nm;
(2) Soaking the biochar in an organic acid solution for 18-30h, and carrying out solid-liquid separation to obtain a slag phase substance and a liquid phase substance;
wherein the organic acid solution is acrylic acid solution or butenoic acid solution; stirring for 8-12min every 2h while soaking;
(3) Soaking the residue phase in 1-5wt% carboxymethyl chitosan solution for 2-4h, filtering, and drying to obtain modified charcoal;
wherein the solid-liquid mass ratio of the slag phase substance to the carboxymethyl chitosan solution is 2-3.
3. The method according to claim 2, wherein in the step (2), the concentration of the organic acid in the organic acid solution is 0.05 to 0.2mol/L.
4. The method according to claim 2, wherein in the step (3), the filtration is carried out using a 100-200 mesh sieve.
5. The production method according to claim 1, wherein the particle size of the particulate matter a is 3 to 5mm; the particle diameter of the polymer resin particles is 3-5mm.
6. The production method according to claim 1, wherein the particle size of the particulate matter B is 3 to 5mm.
7. The method according to claim 1, wherein the molecular weight of the polymer resin in S2 is 100000 to 250000.
8. The method according to claim 1, wherein in S2, the polymer resin is polyethylene and/or polypropylene.
9. The method according to claim 1, wherein in S3, the pellets B obtained in S2 are subjected to screw extrusion at 135-165 ℃.
10. An aerobic suspension carrier, which is produced by the production method according to any one of claims 1 to 9.
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| JP2007189932A (en) * | 2006-01-18 | 2007-08-02 | Fujibo Holdings Inc | Chitosan-based carrier for immobilizing microorganism having magnetism and method for producing the same |
| CN103708619A (en) * | 2014-01-21 | 2014-04-09 | 厦门市威士邦膜科技有限公司 | Fluidized bed biofilm filler, and preparation method and filler structure thereof |
| CN106186285A (en) * | 2016-08-29 | 2016-12-07 | 苏州赛华仪控股份有限公司 | Water treatment filler based on modified biomass lime-ash and preparation method thereof |
| CN107555587A (en) * | 2017-09-16 | 2018-01-09 | 哈尔滨工业大学 | A kind of dynamic aerobe filler and its method for arranging |
| CN109529767A (en) * | 2018-12-10 | 2019-03-29 | 中冶华天工程技术有限公司 | The preparation method and application method of the compound magnetic modification biological Carbon Materials of chitosan |
| CN111732185A (en) * | 2020-04-16 | 2020-10-02 | 南开大学 | Preparation method of aerobic bacteria filler for in-situ purification of domestic sewage |
| CN112028227A (en) * | 2020-07-13 | 2020-12-04 | 新疆德安环保科技股份有限公司 | Method for preparing microorganism attachment carrier by sludge resource utilization |
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