CN109650561B - Denitrification functional filler and preparation and application thereof - Google Patents
Denitrification functional filler and preparation and application thereof Download PDFInfo
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- CN109650561B CN109650561B CN201910141113.6A CN201910141113A CN109650561B CN 109650561 B CN109650561 B CN 109650561B CN 201910141113 A CN201910141113 A CN 201910141113A CN 109650561 B CN109650561 B CN 109650561B
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- 239000012767 functional filler Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 38
- 239000011593 sulfur Substances 0.000 claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000001291 vacuum drying Methods 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 6
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- 239000011148 porous material Substances 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims description 47
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 9
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 7
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 7
- 239000001099 ammonium carbonate Substances 0.000 claims description 7
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims description 6
- 235000019799 monosodium phosphate Nutrition 0.000 claims description 6
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 6
- VBIXEXWLHSRNKB-UHFFFAOYSA-N ammonium oxalate Chemical compound [NH4+].[NH4+].[O-]C(=O)C([O-])=O VBIXEXWLHSRNKB-UHFFFAOYSA-N 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- 235000010489 acacia gum Nutrition 0.000 claims description 4
- 239000001785 acacia senegal l. willd gum Substances 0.000 claims description 4
- 235000019422 polyvinyl alcohol Nutrition 0.000 claims description 4
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- 235000010413 sodium alginate Nutrition 0.000 claims description 4
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- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 3
- 235000010216 calcium carbonate Nutrition 0.000 claims description 3
- 235000011132 calcium sulphate Nutrition 0.000 claims description 3
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 3
- 239000002131 composite material Substances 0.000 abstract 1
- 241000894006 Bacteria Species 0.000 description 57
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 42
- 230000001651 autotrophic effect Effects 0.000 description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 238000005516 engineering process Methods 0.000 description 20
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- 239000002351 wastewater Substances 0.000 description 20
- 229910052742 iron Inorganic materials 0.000 description 18
- 239000010802 sludge Substances 0.000 description 16
- 244000005700 microbiome Species 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 238000012216 screening Methods 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 239000001301 oxygen Substances 0.000 description 12
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 8
- 238000005868 electrolysis reaction Methods 0.000 description 7
- 230000014759 maintenance of location Effects 0.000 description 7
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 6
- HGPWUQTUKGXTBS-UHFFFAOYSA-N [C].[S].[Fe] Chemical compound [C].[S].[Fe] HGPWUQTUKGXTBS-UHFFFAOYSA-N 0.000 description 6
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
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- 239000002253 acid Substances 0.000 description 2
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- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- 238000000053 physical method Methods 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 208000004998 Abdominal Pain Diseases 0.000 description 1
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 206010012735 Diarrhoea Diseases 0.000 description 1
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- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 206010057190 Respiratory tract infections Diseases 0.000 description 1
- 206010047700 Vomiting Diseases 0.000 description 1
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- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
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- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 210000000987 immune system Anatomy 0.000 description 1
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- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
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- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
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- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
-
- 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
- C02F3/105—Characterized by the chemical composition
-
- 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
- C02F3/105—Characterized by the chemical composition
- C02F3/106—Carbonaceous materials
-
- 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
- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a denitrification functional filler and preparation and application thereof. The composite material comprises, by mass, 20-30% of reduced iron powder, 8-10% of activated carbon, 30-40% of sulfur, 2-6% of metal catalyst, 15-20% of adhesive, 3-5% of pore-forming agent, 3-5% of pH regulator, and 15-20% of water based on the sum of the components. Belongs to a denitrification functional filler for reducing carbon source addition. The denitrification functional filler is prepared by the following preparation method: the components are mixed uniformly according to the mass ratio, water accounting for 15-20% of the mass of the components is slowly added to form a viscous mixed material, the mixed material is placed in a mold, the mold is placed in a vacuum drying box for drying, and after demolding, the pore is dried in the vacuum drying box to form the denitrification functional filler.
Description
Technical Field
The invention relates to a technology for treating nitrogen-containing domestic sewage and industrial wastewater, in particular to a denitrification functional filler and preparation and application thereof.
Background
With the development of economy, due to the improvement of the living standard of human beings, the overuse of agricultural chemical fertilizers and other reasons, a large amount of nitrogen-containing domestic sewage and industrial wastewater are discharged into a water body, the over-standard of the nitrogen content can cause eutrophication of the water body, and the nitrogen can be converted into 'three-cause' substance nitrite nitrogen to seriously threaten the health of human beings. When a human body ingests excessive nitrate nitrogen, the risks of abdominal pain, diarrhea, vomiting, essential hypertension, respiratory tract infection, immune system abnormality, enlargement of congenital defects of the central nervous system of infants and the like can be caused. In addition, nitrate nitrogen is converted into nitrite nitrogen in the human body, the toxicity of the nitrite nitrogen is 11 times that of nitrate nitrogen, and the nitrite nitrogen induces a series of diseases, affects the health of the human body and has adverse effects on the society. Therefore, research and development of economic and efficient wastewater denitrification treatment technologies have become key and hot spots in the field of water pollution control engineering. At present, researchers at home and abroad mainly classify physical methods, chemical methods and biological methods according to different treatment methods aiming at the nitrate nitrogen removal technology. The physical methods include an ion exchange resin method, a reverse osmosis membrane method, an electrodialysis membrane method, and the like. The chemical method is mainly characterized in that nitrate nitrogen is catalytically reduced through a catalyst, and common catalytic reducing agents comprise active metals (such as Fe, Al and the like) and non-metals (such as hydrogen and the like). The biological method is to utilize autotrophic or heterotrophic microorganisms to perform denitrification to finally convert nitrate nitrogen into nitrogen, thereby completely removing nitrate. The biological denitrification technology has the advantages of high efficiency, low energy consumption and the like. The groundwater biological denitrification technology can be divided into heterotrophic denitrification technology and autotrophic denitrification technology according to the difference of carbon sources required by microorganisms. Among the denitrification technologies, the biological denitrification technology is economical, efficient and free from secondary pollution, and the research on the denitrification function of the anaerobic reactor has become a hot spot in recent years.
In the traditional autotrophic denitrification reactor, people singly perform denitrification by an iron autotrophic denitrification technology or a sulfur autotrophic denitrification technology. Wherein, the iron-carbon filler can generate a large amount of OH when the galvanic reaction is generated in water by the iron autotrophic denitrification technology-So that the pH value in the water is continuously increased and is not suitable for the survival of microorganisms; meanwhile, as the iron-carbon micro-electrolysis is continuously carried out, ferroferric oxide is formed on the surface of the filler, so that the micro-electrolysis reaction and the growth of microorganisms are hindered; similarly, a large amount of H is produced by the simple sulfur autotrophic denitrification reaction+SO that the pH in the reactor is continuously reduced and is finally unsuitable for the growth of microorganisms, and the SO concentration is high4 2-Can cause the accumulation of nitrous nitrogen.
Disclosure of Invention
The filler is mainly used for accommodating attached microorganisms, is a carrier for the growth of the microorganisms, provides a stable environment for the microorganisms to inhabit and propagate, and has rich inner surfaces for providing attached surfaces and inner spaces for the microorganisms, so that the reactor can keep more microorganism quantity as much as possible. Meanwhile, the filler has a forced turbulent action on the water flow, so that the water flow can be redistributed, and the flow direction of the water flow is changed, so that the water flow is more uniformly distributed under the cross section of the reactor. The filler has a certain interception function on suspended matters in water. Because the reactor is filled with the filler, the concentration of suspended substances in the effluent is greatly reduced. Therefore, the function of the filler in the sewage treatment process is very important. Therefore, the development of proper biological filler is a precondition for popularization and application of the biological denitrification technology in the field of water treatment in the future.
In order to solve the technical problems, the invention provides a denitrification functional filler and preparation and application thereof, and particularly provides a denitrification functional filler capable of reducing carbon source addition. The iron autotrophic denitrification technology and the sulfur autotrophic denitrification technology are creatively combined through the integrated filler, so that the problem that the pH value in the reactor is too high or too low is solved, the accumulation of nitrate nitrogen and nitrite nitrogen is not found, and a good removal effect is achieved. In the filler, iron-carbon micro-electrolysis is generated in water through iron powder and activated carbon, nitrate nitrogen is reduced into nitrogen through generated ferrous iron and reducing hydrogen, meanwhile, iron serves as an oxygen capturing agent to capture and consume dissolved oxygen in underground water, an anaerobic environment necessary for a denitrification process is created, and denitrifying bacteria can reduce the addition of organic carbon sources by using hydrogen and sulfur as electron donors, so that autotrophic denitrification is realized. Removing nitrate nitrogen by a biochemical method. Meanwhile, the filler has high film forming speed, good denitrification performance under the optimal operation process parameters, wide sources and low price.
In order to achieve the aim of the invention, the invention provides a denitrification functional filler which comprises, by mass, 20-30% of reduced iron powder, 8-10% of activated carbon, 30-40% of sulfur, 2-5% of a metal catalyst, 15-20% of an adhesive, 3-5% of a pore-forming agent and 3-5% of a pH regulator.
In the denitrification functional filler provided by the invention, the metal catalyst is selected from one or more of copper powder, magnesium powder, tin powder, manganese powder and titanium powder.
In the denitrification functional filler provided by the invention, the adhesive is one or more of calcium sulfate, sodium alginate, Arabic gum and polyvinyl alcohol.
In the denitrification functional filler provided by the invention, the pore-forming agent is selected from one or two of ammonium bicarbonate or ammonium oxalate.
In the denitrification functional filler provided by the invention, the pH regulator is selected from one or more of sodium bicarbonate, sodium dihydrogen phosphate, sodium hydroxide and calcium carbonate.
In the denitrification functional filler provided by the invention, the particle size of the reduced iron powder is 150-200 meshes; the particle size of the active carbon is 150-200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the particle size of the metal catalyst is 150-200 meshes.
In the denitrification functional filler provided by the invention, the denitrification functional filler is a sphere with the diameter of 9-12 mm.
On the other hand, the invention provides a preparation method of the denitrification functional filler, which comprises the following steps:
the components are mixed uniformly according to the mass ratio, water accounting for 15-20% of the mass of the components is slowly added to form a viscous mixed material, the mixed material is placed in a mold, the mold is placed in a vacuum drying box for drying, and after demolding, the pore is dried in the vacuum drying box to form the denitrification functional filler. Optionally, the preparation process of the denitrification functional filler comprises the steps.
In the preparation method of the denitrification functional filler provided by the invention, the mold is placed in a vacuum drying oven and dried for 6-8h under the drying condition of 45-60 ℃;
in the preparation method of the denitrification functional filler provided by the invention, the drying condition for drying and pore-forming in the vacuum drying oven is 100-120 ℃.
The invention also aims to provide application of the denitrification functional filler for reducing carbon source addition in the anaerobic reactor.
In the application of the denitrification functional filler in the anaerobic reactor, the dissolved oxygen concentration of sewage in the anaerobic reactor is 1.0-2.0mg/L, and the ratio of the COD concentration to the nitrate nitrogen concentration in the sewage is more than or equal to 3, and the C/N is more than or equal to 1.5; if the C/N is more than 3, the heterotrophic denitrifying bacteria in the reactor are dominant, and the heterotrophic bacteria and the autotrophic bacteria are in a competitive relationship, so that the autotrophic bacteria are reduced, and the filler loses the effect;
the volume of the denitrification functional filler is 50-80% of the volume of the anaerobic reactor;
in the anaerobic reactor, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are screened as dominant bacteria.
The invention has the beneficial effects that:
(1) the filler has large specific surface area (245.6 m)2Above/g, sufficient space is provided for the microorganisms to attach, so that as many microorganisms as possible are present in the reactor. Meanwhile, the filler can change the flowing direction of water flow, so that the wastewater is fully contacted with microorganisms, and the removal efficiency of pollutants is improved.
(2) Iron powder and active carbon in the filler form iron-carbon micro-electrolysis reaction in water to generate reduction type hydrogen [ H ] and ferrous iron, and the [ H ] and the ferrous iron reduce part of nitrate nitrogen into nitrogen.
(3) The iron is used as an oxygen catching agent to capture dissolved oxygen in the consumed water and create an anaerobic environment necessary for the denitrification process.
(4) The denitrifying bacteria use hydrogen and elemental sulfur as electron donors to form iron autotrophic denitrification reaction and sulfur autotrophic denitrification reaction for denitrification, thereby reducing the addition of sulfur organic carbon sources and lowering the cost. Meanwhile, the autotrophic denitrifying bacteria have long generation period and small sludge production amount, so that the sludge bulking phenomenon is avoided.
(5) The iron autotrophic denitrification reaction and the sulfur autotrophic denitrification reaction are combined, alkali generated in iron-carbon micro-electrolysis can be subjected to neutralization reaction with acid generated in sulfur autotrophic denitrification, acid-base balance in the reactor is maintained, and the pH value in the reactor is stabilized in a range suitable for the growth of denitrifying bacteria.
(6) When the ratio of the COD concentration to the nitrate nitrogen concentration in the actual sewage is more than or equal to 3 and more than or equal to 1.5, the anaerobic reactor using the denitrification functional filler prepared by the invention can realize autotrophic denitrification without additionally adding a carbon source, and remove nitrate nitrogen by using a biochemical method.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic diagram of denitrification of the filler with denitrification function according to the present invention.
FIG. 2 is a comparison graph of the removal effect of the volcanic rock conventional filler and the denitrification functional filler.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the embodiment of the invention, the invention provides a denitrification functional filler which comprises, by mass, 20-30% of reduced iron powder, 8-10% of activated carbon, 30-40% of sulfur, 2-5% of a metal catalyst, 15-20% of a binder, 3-5% of a pore-forming agent and 3-5% of a pH regulator.
In the embodiment of the invention, the metal catalyst is selected from one or more of copper powder, magnesium powder, tin powder, manganese powder and titanium powder.
In the embodiment of the invention, the adhesive is one or more of calcium sulfate, sodium alginate, arabic gum and polyvinyl alcohol.
In the embodiment of the invention, the pore-forming agent is selected from one or two of ammonium bicarbonate or ammonium oxalate.
In an embodiment of the present invention, the pH adjusting agent is selected from one or more of sodium bicarbonate, sodium dihydrogen phosphate, sodium hydroxide, and calcium carbonate.
In the embodiment of the invention, the particle size of the reduced iron powder is 150-200 meshes; the particle size of the active carbon is 150-200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the particle size of the metal catalyst is 150-200 meshes.
In the embodiment of the invention, the denitrification functional filler is a sphere with the diameter of 9-12 mm.
As shown in figure 1, after the low C/N wastewater enters the anaerobic reactor, a part of heterotrophic denitrifying bacteria utilize an organic carbon source to perform heterotrophic denitrification reaction to convert nitrate nitrogen into nitrogen; the iron-carbon filler is subjected to iron-carbon micro-electrolysis in water to generate [ H ] and ferrous iron, and nitrate nitrogen is reduced into nitrogen or ammonia nitrogen; the iron autotrophic denitrifying bacteria convert nitrate nitrogen into nitrogen by taking hydrogen generated by iron-carbon micro-electrolysis as an electron donor; the sulfur autotrophic denitrifying bacteria convert nitrate nitrogen into nitrogen by taking sulfur as an electron donor. Meanwhile, acid generated in the sulfur autotrophic reaction is neutralized with alkali generated in the iron autotrophic reaction, so that the pH value in the water body is stabilized in a range suitable for the growth of microorganisms.
In the examples of the present invention, the heterotrophic denitrifying bacteria, the iron autotrophic denitrifying bacteria and the sulfur autotrophic denitrifying bacteria used were obtained from sludge in anaerobic concentration tanks of sewage plants in Beijing Hokkoly shops.
The C/N ratio described in the examples and comparative examples of the present invention is the ratio of the COD concentration to the nitrate nitrogen concentration.
Example 1
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the copper powder is 200 meshes;
2) preparing the denitrification functional filler: the components are mixed uniformly according to a certain mass ratio, wherein the reduced iron powder accounts for 30 percent, the activated carbon accounts for 10 percent, the copper powder accounts for 5 percent, the sulfur accounts for 30 percent, the calcium sulfate accounts for 15 percent, the ammonium bicarbonate accounts for 5 percent, and the sodium hydroxide accounts for 5 percent. Slowly adding 15% of water by mass of the components to form a viscous mixed material, filling the mixed material into a spherical mold with the particle size of 9mm, drying the material in a vacuum drying oven at 60 ℃ for 8h, taking out the material from the mold, and drying and forming holes in the vacuum drying oven at 100 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: introducing sewage into the anaerobic reactor of the domesticated and screened dominant bacteria obtained in the step 3), wherein the C/N in the sewage is 1.5-2, the pH is 7.0, the concentration of nitrate nitrogen entering water is 30 +/-5 mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, when the hydraulic retention time HRT is 4h, the effluent concentration of nitrate nitrogen wastewater is 1.5-4.5mg/L, the removal effect reaches 85-95%, and the effluent SO is4 2-The concentration is less than 80mg/L, and the pH value of effluent is 6.8 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Example 2
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the copper powder is 200 meshes; the magnesium powder is 200 meshes;
2) preparing the denitrification functional filler: the components are mixed uniformly according to a certain mass ratio, wherein the reduced iron powder accounts for 30 percent, the activated carbon accounts for 10 percent, the copper powder accounts for 3 percent, the magnesium powder accounts for 2 percent, the sulfur accounts for 30 percent, the sodium alginate accounts for 15 percent, the ammonium bicarbonate accounts for 5 percent, and the sodium dihydrogen phosphate accounts for 5 percent. Slowly adding water with the mass being 15% of the mass of each component to form a sticky state, filling the mixed material into a spherical mold with the particle size of 9mm, drying the material in a vacuum drying oven at 60 ℃ for 8h, taking out the material from the mold, and drying and forming holes in the vacuum drying oven at 100 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: introducing sewage into the anaerobic reactor of the domesticated and screened dominant bacteria obtained in the step 3), wherein the C/N in the sewage is 1.5-2, the pH is 7.0, the concentration of nitrate nitrogen entering water is 30 +/-5 mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, the effluent concentration of nitrate nitrogen wastewater is 2.3-5mg/L when the hydraulic retention time HRT is 4h, the removal effect reaches 83-92%, and the effluent SO is4 2-The concentration is less than 80mg/L, and the pH value of effluent is 6.8 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Example 3
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the manganese powder is 200 meshes; the tin powder is 200 meshes;
2) preparing the denitrification functional filler: the components are mixed uniformly according to a certain mass ratio, wherein the reduced iron powder accounts for 25 percent, the activated carbon accounts for 8 percent, the manganese powder accounts for 3 percent, the tin powder accounts for 2 percent, the sulfur accounts for 38 percent, the Arabic gum accounts for 18 percent, the ammonium oxalate accounts for 3 percent, and the calcium carbonate accounts for 3 percent. Slowly adding water with the mass being 15% of the mass of each component to form a sticky state, filling the mixed material into a spherical mold with the particle size being 9mm, drying the material in a vacuum drying oven at 60 ℃ for 8h, taking out the material from the mold, and drying and forming pores in the vacuum drying oven at 120 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: introducing sewage into the anaerobic reactor of the domesticated and screened dominant bacteria obtained in the step 3), wherein the C/N in the sewage is 1.5-2, the pH is 7.0, the concentration of nitrate nitrogen entering water is 30 +/-5 mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, when the hydraulic retention time HRT is 4h, the effluent concentration of nitrate nitrogen wastewater is 3.1-5.8mg/L, the removal effect reaches 81-90%, and the effluent SO is4 2-The concentration is less than 100mg/L, and the pH value of effluent is 6.8 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Example 4
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the titanium powder is 200 meshes; the tin powder is 200 meshes;
2) preparing the denitrification functional filler: the components are mixed evenly according to a certain mass ratio, wherein the reduced iron powder accounts for 30 percent, the activated carbon accounts for 10 percent, the titanium powder accounts for 3 percent, the tin powder accounts for 2 percent, the sulfur accounts for 31 percent, the polyvinyl alcohol accounts for 18 percent, the ammonium oxalate accounts for 3 percent, and the calcium carbonate accounts for 3 percent. Slowly adding water with the mass being 15% of the mass of each component to form a sticky state, filling the mixed material into a spherical mold with the particle size being 9mm, drying the material in a vacuum drying oven at 45 ℃ for 8h, taking out the material from the mold, and drying and forming pores in the vacuum drying oven at 120 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: introducing sewage into the anaerobic reactor of the domesticated and screened dominant bacteria obtained in the step 3), wherein the C/N in the sewage is 1.5-2, the pH is 7.0, the concentration of nitrate nitrogen entering water is 30 +/-5 mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, when the hydraulic retention time HRT is 4h, the effluent concentration of the nitrate nitrogen wastewater is 4.2-7.4mg/L, the removal effect reaches 76-86%, and the effluent SO is4 2-The concentration is less than 70mg/L, and the pH of the effluent is 7.1 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Example 5
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the copper powder is 200 meshes; the magnesium powder is 200 meshes; the tin powder is 200 meshes;
2) preparing the denitrification functional filler: the components are blended and mixed uniformly according to a certain mass ratio, wherein the reduced iron powder accounts for 20 percent, the activated carbon accounts for 10 percent, the copper powder accounts for 2 percent, the magnesium powder accounts for 2 percent, the tin powder accounts for 2 percent, the sulfur accounts for 40 percent, the calcium sulfate accounts for 15 percent, the ammonium bicarbonate accounts for 5 percent, the sodium hydroxide accounts for 2 percent, and the sodium dihydrogen phosphate accounts for 2 percent. Slowly adding water with the mass being 15% of the mass of each component to form a sticky state, filling the mixed material into a spherical mold with the particle size being 9mm, drying the material in a vacuum drying oven at 60 ℃ for 8h, taking out the material from the mold, and drying and forming pores in the vacuum drying oven at 120 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: in step 3)Sewage is introduced into the obtained anaerobic reactor for domesticating and screening dominant bacteria, the C/N in the sewage is 1.5-2, the pH is 7.0, the concentration of nitrate nitrogen in inlet water is 30 +/-5 mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, after stable operation for one month, when the hydraulic retention time HRT is 4h, the concentration of outlet water is 3.5-5.3mg/L, the removal effect reaches 82-88%, and the outlet water SO is4 2-The concentration is less than 100mg/L, and the pH value of effluent is 6.3 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Example 6
In this embodiment, the filler with denitrification function for reducing carbon source addition used in the biological denitrification technology for low C/N wastewater has the following preparation steps:
1) selecting raw materials: selecting reduced iron powder of 200 meshes; the active carbon is 200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the copper powder is 200 meshes; the manganese powder is 200 meshes; the titanium powder is 200 meshes;
2) preparing the denitrification functional filler: the components are blended and mixed uniformly according to a certain mass ratio, wherein the reduced iron powder accounts for 30 percent, the activated carbon accounts for 8 percent, the copper powder accounts for 2 percent, the manganese powder accounts for 2 percent, the titanium powder accounts for 2 percent, the sulfur accounts for 32 percent, the calcium sulfate accounts for 15 percent, the ammonium bicarbonate accounts for 5 percent, the sodium bicarbonate accounts for 2 percent, and the sodium dihydrogen phosphate accounts for 2 percent. Slowly adding water with the mass being 15% of the mass of each component to form a sticky state, filling the mixed material into a spherical mold with the particle size of 9mm, drying the material in a vacuum drying oven at 60 ℃ for 8h, taking out the material from the mold, and drying and forming holes in the vacuum drying oven at 100 ℃ to prepare the iron-carbon-sulfur integrated filler, namely the denitrification functional filler.
3) Domesticating and screening dominant bacteria: C/N is 1.5-2, pH is 7.0, nitrate nitrogen wastewater with inlet water concentration of 30 +/-5 mg/L passes through an anaerobic reactor filled with the denitrification functional filler prepared in the step 2) and sludge, the filler accounts for 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, heterotrophic denitrifying bacteria, iron autotrophic denitrifying bacteria and sulfur autotrophic denitrifying bacteria are dominant bacteria in the anaerobic reactor after circulating inlet water, stably running for one month, domesticating and screening.
4) The application of the denitrification functional filler comprises the following steps: introducing sewage into the anaerobic reactor of the domesticated and screened dominant bacteria obtained in the step 3), wherein the C/N in the sewage is 1.5-2, the pH is 7.0, and feeding waterThe concentration of nitrate nitrogen is 30 plus or minus 5mg/L, the concentration of dissolved oxygen is 1.0-2.0mg/L, when the hydraulic retention time HRT is 4h, the effluent concentration of the nitrate nitrogen wastewater is 4.1-5.4mg/L, the removal effect reaches 82-87%, and the effluent SO is4 2-The concentration is less than 80mg/L, and the pH value of effluent is 6.8 +/-0.2. The removal rate of nitrate nitrogen in effluent is superior to that of other fillers.
Comparative example 1
Under the conditions that the average influent nitrate nitrogen concentration is 30mg/L, the C/N is 1.5-2, the hydraulic retention time HRT is 4h, and the dissolved oxygen concentration is 1.0-2.0mg/L, the volcanic rock conventional filler and the denitrification functional filler prepared in the example 3 are respectively added into two identical reactors, wherein the volume of the filler is 50% of the volume of the reactor, the addition amount of the sludge is 4000mg/L, the reactor is stably operated for one month by circulating influent water, and the removal effects of the volcanic rock conventional filler and the denitrification functional filler are shown in figure 2.
The dominant bacteria in the reactor using the volcanic rock conventional packing is heterotrophic denitrifying bacteria, but when C/N is 1.5-2, the living conditions of the heterotrophic bacteria are poor, so that the denitrification process is incomplete, nitrite nitrogen is accumulated, and the denitrification effect is general.
As can be seen from FIG. 2, the removal efficiency is 50% when the volcanic rock conventional filler is used, and the removal rate can reach 85% when the denitrification functional filler is used. If a reactor using the volcanic rock conventional packing needs to obtain a good removal effect, glucose is used as a carbon source, and the carbon/N of the reactor is 6.4-7.5, which is far larger than that required by a functional packing.
And in the technical scheme of the invention, the C/N is 1.5-2, so that the dependence on an organic carbon source in the traditional biological denitrification process is reduced, and no additional carbon source is required to be added into the sewage.
Note that the above is only a preferred embodiment of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (6)
1. The filler with the denitrification function comprises, by mass, 20-30% of reduced iron powder, 8-10% of activated carbon, 30-40% of sulfur, 2-6% of metal catalyst, 15-20% of adhesive, 3-5% of pore-forming agent, 3-5% of pH regulator and 15-20% of water accounting for the sum of the mass of the components;
the metal catalyst is selected from one or more of copper powder, magnesium powder, tin powder, manganese powder and titanium powder;
the adhesive is one or more of calcium sulfate, sodium alginate, Arabic gum and polyvinyl alcohol;
the pore-forming agent is selected from one or two of ammonium bicarbonate or ammonium oxalate;
the pH regulator is selected from one or more of sodium bicarbonate, sodium dihydrogen phosphate, sodium hydroxide and calcium carbonate;
the specific surface area of the denitrification functional filler is 245.6m2More than g.
2. The denitrification functional filler as set forth in claim 1,
the particle size of the reduced iron powder is 150-200 meshes; the particle size of the active carbon is 150-200 meshes; the particle size of the sulfur particles is 0.5-1 mm; the particle size of the metal catalyst is 150-200 meshes.
3. The denitrification functional filler according to claim 1 or 2, wherein,
the denitrification functional filler is a sphere with the diameter of 9-12 mm.
4. A method for preparing the denitrification functional filler of any one of claims 1 to 3, comprising the following steps:
the components are mixed uniformly according to the mass ratio, water accounting for 15-20% of the mass of the components is slowly added to form a viscous mixed material, the mixed material is placed in a mold, the mold is placed in a vacuum drying box for drying, and after demolding, the pore is dried in the vacuum drying box to form the denitrification functional filler.
5. The method for preparing the denitrification functional filler according to claim 4, wherein the drying conditions in the vacuum drying oven for placing the mold are 45-60 ℃ for 6-8 h;
the drying condition of drying and pore-forming in the vacuum drying oven is 100-120 ℃.
6. Use of the denitrification functional filler of any one of claims 1 to 3 in an anaerobic reactor.
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| CN111072132A (en) * | 2020-01-09 | 2020-04-28 | 北京恩菲环保股份有限公司 | Sulfur-iron autotrophic denitrification suspended filler and preparation method thereof |
| CN111229252A (en) * | 2020-03-10 | 2020-06-05 | 北京和众大成环保科技有限公司 | Novel iron matrix high-efficiency catalytic carrier with autotrophic and heterotrophic coupling effects |
| CN111484131A (en) * | 2020-04-07 | 2020-08-04 | 水艺控股集团股份有限公司 | Carbon-free autotrophic nitrogen removal tank |
| CN111547839A (en) * | 2020-04-07 | 2020-08-18 | 水艺控股集团股份有限公司 | Composite sulfur-based porous filler |
| CN113522228B (en) * | 2021-07-20 | 2022-10-18 | 南京大学 | Light material for synchronous denitrification and chromium removal and preparation method and application thereof |
| CN113620414A (en) * | 2021-10-11 | 2021-11-09 | 黄河三角洲京博化工研究院有限公司 | Composite slow-release filler, preparation method and application thereof |
| CN114314826B (en) * | 2021-12-28 | 2023-05-02 | 四川发展国润水务投资有限公司 | Autotrophic denitrification fiber chain type suspension ball and manufacturing method thereof |
| CN114409068A (en) * | 2022-01-24 | 2022-04-29 | 北京中持碧泽环境技术有限责任公司 | Autotrophic nitrogen and phosphorus removal biological carrier and preparation method and application thereof |
| CN114538613B (en) * | 2022-01-28 | 2023-10-27 | 长安大学 | Double-filler denitrification biological method for reducing nitrous oxide emission and application device |
| CN114573103A (en) * | 2022-04-01 | 2022-06-03 | 山东太平洋环保股份有限公司 | Preparation method and application of efficient denitrification composite filler |
| CN115028261A (en) * | 2022-06-13 | 2022-09-09 | 浙江中诚环境研究院有限公司 | Sulfur autotrophic denitrification filler and preparation method thereof |
| CN115490325A (en) * | 2022-09-29 | 2022-12-20 | 青岛科技大学 | Preparation method and application of MOFs catalytic hydrogen production filler |
| CN116715357B (en) * | 2023-08-11 | 2023-10-31 | 上海勘测设计研究院有限公司 | Composite filler, denitrification filter and denitrification method for sulfur autotrophic denitrification biological denitrification |
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| CN104761024B (en) * | 2015-04-22 | 2017-03-15 | 湖北泉盛环保科技股份有限公司 | Efficient heterogeneous catalytic oxidation iron-carbon micro-electrolysis filler and preparation method thereof |
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