CN112390368A - Novel bentonite composite active carbon ecological floating bed filler and preparation method thereof - Google Patents
Novel bentonite composite active carbon ecological floating bed filler and preparation method thereof Download PDFInfo
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- CN112390368A CN112390368A CN202011072343.0A CN202011072343A CN112390368A CN 112390368 A CN112390368 A CN 112390368A CN 202011072343 A CN202011072343 A CN 202011072343A CN 112390368 A CN112390368 A CN 112390368A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 239000000440 bentonite Substances 0.000 title claims abstract description 55
- 229910000278 bentonite Inorganic materials 0.000 title claims abstract description 55
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000000945 filler Substances 0.000 title claims abstract description 55
- 238000007667 floating Methods 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 235000017060 Arachis glabrata Nutrition 0.000 claims abstract description 17
- 235000010777 Arachis hypogaea Nutrition 0.000 claims abstract description 17
- 235000018262 Arachis monticola Nutrition 0.000 claims abstract description 17
- 235000020232 peanut Nutrition 0.000 claims abstract description 17
- 239000000853 adhesive Substances 0.000 claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000012298 atmosphere Substances 0.000 claims abstract description 8
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 3
- 241001553178 Arachis glabrata Species 0.000 claims abstract 6
- 229940092782 bentonite Drugs 0.000 claims description 49
- 230000032683 aging Effects 0.000 claims description 10
- 239000011812 mixed powder Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 2
- 238000007873 sieving Methods 0.000 claims description 2
- 229940080314 sodium bentonite Drugs 0.000 claims description 2
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 3
- 239000011574 phosphorus Substances 0.000 abstract description 3
- 235000015097 nutrients Nutrition 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000003837 high-temperature calcination Methods 0.000 abstract 1
- 244000105624 Arachis hypogaea Species 0.000 description 11
- 238000001179 sorption measurement Methods 0.000 description 9
- 239000000975 dye Substances 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 239000003864 humus Substances 0.000 description 4
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 4
- 229960000907 methylthioninium chloride Drugs 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 125000003636 chemical group Chemical group 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 241000195493 Cryptophyta Species 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- 238000009360 aquaculture Methods 0.000 description 1
- 244000144974 aquaculture Species 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000032770 biofilm formation Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004009 herbicide Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- -1 shells Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 239000000979 synthetic dye Substances 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a novel bentonite composite active carbon ecological floating bed filler and a preparation method thereof, wherein the filler comprises the following raw materials in percentage by mass: 52-58% of bentonite, 22-25% of activated carbon, 8-15% of pore-forming agent and 7-11% of adhesive. The preparation method is characterized in that bentonite and active carbon are used as raw materials, peanut shell powder is used as a pore-forming agent, and sodium silicate is used as an adhesive, and the bentonite and the active carbon are obtained by high-temperature calcination in an inert atmosphere. The novel bentonite composite active carbon ecological floating bed filler prepared by the invention has the advantages of high strength, large porosity, large specific surface area, high water absorption and the like, and has good removal effect on nitrogen, phosphorus and other nutrient salts and solubility chromaticity in water.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, relates to a filler of an ecological floating bed, and particularly relates to a novel bentonite composite active carbon ecological floating bed filler and a preparation method thereof.
Background
The ecological floating bed technology is a water body biological treatment method with low cost and good effect, is an important in-situ water body restoration technology, has the advantages of directly utilizing water surface space without additionally occupying land, being convenient to manage, having low operation cost, not causing secondary pollution to water bodies and the like, and is widely applied to water body treatment in a plurality of fields of agricultural wastewater, domestic sewage, aquaculture wastewater, eutrophicated lakes, rivers and the like.
The ecological floating bed is also called artificial floating bed, plant floating bed, artificial floating island, etc. and consists of mainly floating bed frame, floating bed body, floating bed matrix and floating bed plant. At present, zeolite, vermiculite, fly ash, biological ceramsite and biological fiber such as bamboo filament, straw and the like are commonly used as floating bed substrates. The biological ceramsite is widely applied due to the high porosity, large specific surface area and rough surface, and is easy to grow by a microorganism biofilm. The biological ceramsite attached and grown by microorganisms has a good removal effect on nutrient substances such as nitrogen and phosphorus in a water body, and in addition, has a good removal effect on the non-soluble chromaticity formed by plankton and plankton algae in the water body, but has a poor treatment effect on the soluble chromaticity caused by pollution of humus, dye wastewater and the like in the water body.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a novel bentonite composite activated carbon ecological floating bed filler, which is formed by compounding bentonite with an activated carbon component, so that the filler has a removal effect on non-soluble chromaticity formed by plankton and plankton algae, and simultaneously, the removal effect of the filler on soluble chromaticity formed by organic matters such as humus, dye molecules and the like is greatly improved, and the COD of a water body is greatly reduced; the invention also aims to provide a preparation method of the filler, which comprises the steps of mixing bentonite, activated carbon, peanut shell powder and an adhesive, adding water, stirring to form pug, granulating, drying, and calcining in an inert atmosphere.
The invention is realized by the following technical scheme:
the novel bentonite composite active carbon ecological floating bed filler is composed of the following raw materials in percentage by mass: 52-58% of bentonite, 22-25% of activated carbon, 8-15% of pore-forming agent and 7-11% of adhesive.
The invention further improves the scheme as follows:
the pore-forming agent is peanut shell powder; the adhesive is sodium silicate.
Further, the bentonite is natural sodium bentonite, and the particle size of the bentonite is 100-300 meshes; the particle size of the activated carbon is 100-300 meshes.
Further, the peanut shell powder is obtained by drying and crushing peanut shells and sieving the peanut shells with a sieve of 80-150 meshes.
The invention further improves the scheme as follows:
the preparation method of the novel bentonite composite active carbon ecological floating bed filler comprises the following steps:
a. mixing bentonite, activated carbon, peanut shell powder and an adhesive in proportion to obtain mixed powder;
b. adding a proper amount of water into the mixed powder, uniformly stirring to form pug, aging for 10-15 hours, extruding the pug into strips, forming, cutting the pug into sections with the section diameter of 6-10 mm, growing the sections into 5-7mm, aging for 2-5 hours again, drying at 80-130 ℃, and calcining at 500-550 ℃ for 0.5-2 hours in an inert atmosphere to obtain the novel bentonite composite activated carbon ecological floating bed filler.
The active carbon is prepared by organic substances such as shells, coal or wood through pyrolysis and activation processing, has a developed microporous structure, abundant surface chemical groups and very strong adsorption performance, can remove peculiar smell, colloid and heavy metals in water and organic substances such as synthetic detergents, pesticides, herbicides, synthetic dyes and the like, not only can greatly reduce the chromaticity of the water, but also can reduce the COD of the water.
The invention uses bentonite and active carbon as base materials, peanut shell powder as pore-forming agent, adds a proper amount of adhesive, mixes and granulates, and calcines at high temperature in inert atmosphere to obtain the novel bentonite composite active carbon ecological floating bed filler, so that the filler has higher porosity, larger specific surface area and stronger adsorptivity, the surface of the filler is rough, the microbial biofilm formation growth is easy, and the filler has better removal effect on nitrogen, phosphorus and other nutritive salts in water. Compared with other ecological floating bed filler substrates, the novel ecological floating bed filler prepared by the invention is compounded with active carbon components, the high specific surface area of the active carbon and the chemical groups such as carboxyl, hydroxyl and the like which are abundant on the surface of the active carbon are fully utilized, and the chemical groups can be combined with organic matters such as dye molecules and the like, so that the color-developing organic matters are gathered on the surface of the active carbon, the removal effect of the solubility chromaticity formed by the organic matters such as humus, dye molecules and the like is greatly improved, and the COD of a water body is greatly reduced.
Compared with the prior art, the invention has the beneficial effects that:
(1) the bentonite used in the invention is from natural ore, has wide source and low price, and expands the application of the bentonite.
(2) The excellent adsorbability of the active carbon is fully utilized, the active carbon component is compounded in the bentonite-based ecological floating bed filler, the removal of peculiar smell and solubility chromaticity of the filler to water is obviously improved, the COD of the water is reduced, the preparation process is simple, the raw material source is very wide, the price is low, and the industrial large-scale production is facilitated.
(3) The invention adopts the peanut shell powder as the pore-forming agent, thereby realizing the resource utilization of agricultural wastes.
(4) The bentonite composite active carbon ecological floating bed filler prepared by the method has low calcining temperature, and can achieve the purposes of energy conservation and environmental protection.
Drawings
Fig. 1 is a photograph of the novel bentonite composite active carbon ecological floating bed filler prepared by the invention, and the particles are black or gray black.
FIG. 2 shows a commercially available shale ceramsite filler produced in Henan province, wherein the granules are gray.
FIG. 3 is a comparison graph of the adsorption capacity of the novel bentonite composite activated carbon ecological floating bed filler prepared by the invention and the ammonia nitrogen adsorption capacity of the commercially available shale ceramsite filler.
FIG. 4 is a comparison graph of the adsorption capacity of the novel bentonite composite activated carbon ecological floating bed filler prepared by the invention and the methylene blue adsorbed by the commercially available shale ceramsite filler.
Detailed Description
Example 1
The raw materials of the novel bentonite composite active carbon ecological floating bed filler in the embodiment comprise the following raw materials in percentage by mass: 58% of bentonite, 25% of activated carbon, 8.5% of pore-forming agent and 8.5% of adhesive.
The novel bentonite composite active carbon ecological floating bed filler in the embodiment is prepared by the following steps:
a. mixing bentonite, activated carbon, peanut shell powder and an adhesive in proportion to obtain mixed powder;
b. adding a proper amount of water into the mixed powder, uniformly stirring to form pug, and aging for 12And h, extruding the pug into strips, forming the pug into sections with the diameter of 8mm, cutting the pug into small sections with the length of 5-7mm, aging the small sections for 3 hours again, drying the sections at 105 ℃, and calcining the sections for 40 minutes at 550 ℃ in an inert atmosphere to obtain the novel bentonite composite activated carbon ecological floating bed filler. The average compressive strength of the prepared filler is 61.56N, the average porosity is 56.84 percent, and the apparent density is 1.31g/cm3。
Example 2
The raw materials of the novel bentonite composite active carbon ecological floating bed filler in the embodiment comprise the following raw materials in percentage by mass: 54% of bentonite, 23% of activated carbon, 15.5% of pore-forming agent and 7.5% of adhesive.
The novel bentonite composite active carbon ecological floating bed filler in the embodiment is prepared by the following steps:
a. mixing bentonite, activated carbon, peanut shell powder and an adhesive in proportion to obtain mixed powder;
b. adding a proper amount of water into the mixed powder, uniformly stirring to form pug, aging for 12 hours, extruding the pug into strips, forming the pug into sections with the diameter of 8mm, cutting the sections into sections with the length of 5-7mm, aging for 3 hours again, drying at 105 ℃, and calcining for 2 hours at 500 ℃ in an inert atmosphere to obtain the novel bentonite composite activated carbon ecological floating bed filler. The average compressive strength of the prepared filler is 43.13N, the average porosity is 64.50 percent, and the apparent density is 1.14g/cm3。
Example 3
The raw materials of the novel bentonite composite active carbon ecological floating bed filler in the embodiment comprise the following raw materials in percentage by mass: 52% of bentonite, 22% of activated carbon, 15% of pore-forming agent and 11% of adhesive.
The novel bentonite composite active carbon ecological floating bed filler in the embodiment is prepared by the following steps:
a. mixing bentonite, activated carbon, peanut shell powder and an adhesive in proportion to obtain mixed powder;
b. adding a proper amount of water into the mixed powder, uniformly stirring to form pug, aging for 12 hours, extruding the pug into strips, forming the pug with the section diameter of 8mm, cutting the pug into small sections with the length of 5-7mm, aging for 3 hours again, drying at 105 ℃, and then performing inert atmosphere treatment on the pugCalcining at 550 ℃ for 40 minutes to obtain the novel bentonite composite active carbon ecological floating bed filler. The average compressive strength of the prepared filler is 50.73N, the average porosity is 58.09 percent, and the apparent density is 1.10g/cm3。
Example 4
Taking an on-sale ceramsite filler produced in Henan province as a control, and investigating the effects of the novel bentonite composite activated carbon ecological floating bed filler prepared in comparative examples 1, 2 and 3 on the adsorption amount of ammonia nitrogen in a water body and the removal effect of solubility chromaticity of the on-sale ceramsite filler. The adsorption capacity of the filler to the methylene blue of the soluble organic dye is used as an evaluation index of the removal effect of the water solubility chromaticity, and the experimental result is shown in table 1:
TABLE 1 adsorption of ammonia nitrogen and methylene blue by four fillers
As can be seen from table 1, compared with the ceramsite filler on sale, the novel bentonite composite activated carbon ecological floating bed filler prepared in the embodiments 1 to 3 of the present invention has significantly higher adsorption capacity to the methylene blue, which proves that the novel bentonite composite activated carbon ecological floating bed filler prepared in the present invention has an effect of removing the solubility chromaticity formed by organic substances such as humus, dye molecules, etc.; meanwhile, the adsorption effect on ammonia nitrogen is obvious, and the COD of the water body can be reduced.
Claims (5)
1. The novel bentonite composite active carbon ecological floating bed filler is characterized by comprising the following raw materials in percentage by mass: 52-58% of bentonite, 22-25% of activated carbon, 8-15% of pore-forming agent and 7-11% of adhesive.
2. The novel bentonite composite active carbon ecological floating bed filler as claimed in claim 1, is characterized in that: the pore-forming agent is peanut shell powder; the adhesive is sodium silicate.
3. The novel bentonite composite active carbon ecological floating bed filler as claimed in claim 1, is characterized in that: the bentonite is natural sodium bentonite, and the particle size of the bentonite is 100-300 meshes; the particle size of the activated carbon is 100-300 meshes.
4. The novel bentonite composite active carbon ecological floating bed filler as claimed in claim 2, is characterized in that: the peanut shell powder is obtained by drying and crushing peanut shells and sieving the peanut shells with a sieve of 80-150 meshes.
5. The method for preparing the novel bentonite composite activated carbon ecological floating bed filler as claimed in any one of claims 1 to 4, is characterized by comprising the following steps:
a. mixing bentonite, activated carbon, peanut shell powder and an adhesive in proportion to obtain mixed powder;
b. adding a proper amount of water into the mixed powder, uniformly stirring to form pug, aging for 10-15 hours, extruding the pug into strips, forming, cutting the pug into sections with the section diameter of 6-10 mm, growing the sections into 5-7mm, aging for 2-5 hours again, drying at 80-130 ℃, and calcining at 500-550 ℃ for 0.5-2 hours in an inert atmosphere to obtain the novel bentonite composite activated carbon ecological floating bed filler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011072343.0A CN112390368A (en) | 2020-10-09 | 2020-10-09 | Novel bentonite composite active carbon ecological floating bed filler and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011072343.0A CN112390368A (en) | 2020-10-09 | 2020-10-09 | Novel bentonite composite active carbon ecological floating bed filler and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133029A (en) * | 2021-12-13 | 2022-03-04 | 北京桑德环境工程有限公司 | Bacterium-rich porous denitrification filler and preparation method thereof |
| CN115057645A (en) * | 2022-06-09 | 2022-09-16 | 苏州中晟环境修复有限公司 | Production process and device of composite ecological filler |
| CN115672284A (en) * | 2022-11-03 | 2023-02-03 | 武汉航发瑞华生态科技有限公司 | Magnetic composite matrix particle and preparation method and application thereof |
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| CN103693747A (en) * | 2013-12-02 | 2014-04-02 | 河南三三农业科技有限公司 | Inorganic material carrier applied to ecological floating bed |
| CN108017154A (en) * | 2017-11-16 | 2018-05-11 | 广东省农业科学院农业资源与环境研究所 | A kind of preparation and its application of the compounded mix biological floating bed applied to combined type triple effect |
| CN209113587U (en) * | 2018-03-05 | 2019-07-16 | 南京水之灵环保科技有限公司 | A kind of novel ecological floating bed |
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2020
- 2020-10-09 CN CN202011072343.0A patent/CN112390368A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1486940A (en) * | 2003-08-13 | 2004-04-07 | 涉 张 | Composite stuffing for sewage treating biofilm process |
| CN103693747A (en) * | 2013-12-02 | 2014-04-02 | 河南三三农业科技有限公司 | Inorganic material carrier applied to ecological floating bed |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114133029A (en) * | 2021-12-13 | 2022-03-04 | 北京桑德环境工程有限公司 | Bacterium-rich porous denitrification filler and preparation method thereof |
| CN114133029B (en) * | 2021-12-13 | 2024-01-05 | 北京桑德环境工程有限公司 | Fungus-rich porous denitrification filler and preparation method thereof |
| CN115057645A (en) * | 2022-06-09 | 2022-09-16 | 苏州中晟环境修复有限公司 | Production process and device of composite ecological filler |
| CN115672284A (en) * | 2022-11-03 | 2023-02-03 | 武汉航发瑞华生态科技有限公司 | Magnetic composite matrix particle and preparation method and application thereof |
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