CN114524507A - Self-activated nitrogen and phosphorus removal carrier material and preparation method and application thereof - Google Patents
Self-activated nitrogen and phosphorus removal carrier material and preparation method and application thereof Download PDFInfo
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- CN114524507A CN114524507A CN202210202774.7A CN202210202774A CN114524507A CN 114524507 A CN114524507 A CN 114524507A CN 202210202774 A CN202210202774 A CN 202210202774A CN 114524507 A CN114524507 A CN 114524507A
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- 239000012876 carrier material Substances 0.000 title claims abstract description 100
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 46
- 239000011574 phosphorus Substances 0.000 title claims abstract description 46
- 150000002829 nitrogen Chemical class 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 148
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 145
- 239000011593 sulfur Substances 0.000 claims abstract description 145
- 239000000463 material Substances 0.000 claims abstract description 81
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000007952 growth promoter Substances 0.000 claims abstract description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 44
- 244000005700 microbiome Species 0.000 claims abstract description 39
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 31
- 239000011707 mineral Substances 0.000 claims abstract description 31
- 229910052742 iron Inorganic materials 0.000 claims abstract description 29
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 239000010865 sewage Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims description 53
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 50
- 238000009835 boiling Methods 0.000 claims description 42
- 239000002994 raw material Substances 0.000 claims description 38
- 235000010755 mineral Nutrition 0.000 claims description 30
- 239000011790 ferrous sulphate Substances 0.000 claims description 25
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 25
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 25
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 25
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 25
- 230000000813 microbial effect Effects 0.000 claims description 25
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 25
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 20
- 230000003179 granulation Effects 0.000 claims description 20
- 238000005469 granulation Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 18
- 235000011147 magnesium chloride Nutrition 0.000 claims description 17
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 17
- 239000000347 magnesium hydroxide Substances 0.000 claims description 17
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 5
- 229910021536 Zeolite Inorganic materials 0.000 claims description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 4
- 239000010457 zeolite Substances 0.000 claims description 4
- 239000005909 Kieselgur Substances 0.000 claims description 3
- 239000004113 Sepiolite Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052624 sepiolite Inorganic materials 0.000 claims description 3
- 235000019355 sepiolite Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 22
- 239000002245 particle Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 14
- 238000013329 compounding Methods 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 230000001651 autotrophic effect Effects 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012851 eutrophication Methods 0.000 description 5
- 239000006028 limestone Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- 235000019738 Limestone Nutrition 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000032770 biofilm formation Effects 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-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
- 229940123973 Oxygen scavenger Drugs 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000013354 porous framework Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Images
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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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- 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
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention relates to an auto-activated nitrogen and phosphorus removal carrier material and a preparation method and application thereof. The carrier material for the self-activated nitrogen and phosphorus removal comprises a sulfur-containing carrier, and a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter which are dispersedly filled in the sulfur-containing carrier; the sulfur-containing carrier is a porous carrier material loaded with sulfur. The specific surface area of the self-activated nitrogen and phosphorus removal carrier material is large and the uniformity is high, so that the nitrogen removal efficiency of the self-activated nitrogen and phosphorus removal carrier material is high, the nitrogen removal effect is stable, and the effect of the self-activated nitrogen and phosphorus removal carrier material for treating sewage is good.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an auto-active denitrification and dephosphorization carrier material and a preparation method and application thereof.
Background
The eutrophication of water bodies is a global phenomenon in recent decades and is influenced by human activities, and the eutrophication tends to be caused by the increase of the discharge amount of nutritive salts in water bodies such as rivers, lakes and the like. When eutrophication occurs in a water body, algae eruption causes the water quality to be poor in oxygen and worsened, fishy smell is filled everywhere, the stability of a water body ecological system is damaged, and the safety of urban water supply and drinking water is seriously influenced. The fundamental cause of water eutrophication is the increase of nutrient elements of nitrogen and phosphorus, and the problem of water eutrophication is solved. Although biochemical treatment in urban sewage treatment plants can reduce most pollutants (mainly organic matters), the concentration of total nitrogen effluent is still high, and biochemical treatment in urban sewage treatment plants is not a fundamental solution to the problem and can only play a role in delaying.
The traditional denitrification technology comprises a physical treatment technology, a chemical treatment technology and a biological treatment technology. Wherein the biological treatment technology is to utilize the denitrification of microorganisms to carry out denitrification treatment on the sewage. Depending on the carbon source required, autotrophic denitrification and heterotrophic denitrification can be distinguished. Autotrophic denitrification refers to a process in which bacteria reduce nitrate into nitrogen by using inorganic carbon as a growth carbon source and elemental sulfur, sulfide and the like as electron donors under anoxic or anaerobic conditions. Wherein the sulfur-limestone autotrophic denitrification system has wide application. However, the conventional autotrophic denitrification system has low denitrification efficiency and unstable denitrification effect.
Disclosure of Invention
Therefore, it is necessary to provide a self-activated denitrification and dephosphorization carrier material capable of improving denitrification efficiency and having stable denitrification effect, and a preparation method and an application thereof.
In one aspect of the invention, an auto-active denitrification and dephosphorization carrier material is provided, which comprises a sulfur-containing carrier, a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter; the alkalescent mineral material, the iron-based material and the microorganism growth promoter are filled in the sulfur-containing carrier in a dispersing way; the sulfur-containing carrier is a porous carrier material loaded with sulfur.
In some of these embodiments, the self-activated denitrification and dephosphorization support material is prepared by boiling granulation of the sulfur-containing support, the weakly basic mineral material, the iron-based material, and the microbial growth promoter.
In some embodiments, the mass ratio of the sulfur-containing carrier, the weakly basic mineral material, the iron-based material and the microorganism growth promoter is (1-20): (1-10): (1-5): (1-5).
In some of these embodiments, the porous support material is selected from at least one of porous biochar, diatomaceous earth, sepiolite, and zeolite.
In some of these embodiments, the weakly basic mineral material is selected from at least one of magnesium hydroxide and magnesium oxide.
In some of these embodiments, the ferrous material is selected from at least one of reduced zero-valent iron powder and sponge iron powder.
In some of these embodiments, the microbial growth promoting agent comprises sodium thiosulfate, magnesium chloride, and ferrous sulfate.
In some embodiments, the mass ratio of the sodium thiosulfate to the magnesium chloride to the ferrous sulfate is (10-20): (5-10): (1-5).
In one of themIn some embodiments, the specific surface area of the self-activated denitrification and dephosphorization carrier material is 5m2/g～300m2/g。
In another aspect of the present invention, a preparation method of the above self-activated denitrification and dephosphorization carrier material is also provided, which comprises the following steps:
mixing and granulating the weakly alkaline mineral material, the iron-based material and the microorganism growth promoter to prepare raw material balls;
heating the sulfur-containing support to melt the sulfur therein;
and boiling and granulating the heated sulfur-containing carrier and the raw material balls to prepare the self-activated nitrogen and phosphorus removal carrier material.
In some of these embodiments, the method of preparing the sulfur-containing support comprises the steps of:
mixing liquid sulfur with a porous carrier material, cooling and forming to prepare the sulfur-containing carrier.
In another aspect of the invention, the application of the self-activated denitrification and dephosphorization carrier material in sewage treatment is also provided.
The self-activated nitrogen and phosphorus removal carrier material comprises a sulfur-containing carrier, and a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter which are dispersedly filled in the sulfur-containing carrier, and the self-activated nitrogen and phosphorus removal carrier material has larger specific surface area and high uniformity, so that the self-activated nitrogen and phosphorus removal carrier material has higher nitrogen removal efficiency and stable nitrogen removal effect.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing an activated denitrification and dephosphorization carrier material according to an embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides an auto-active denitrification and dephosphorization carrier material, which comprises a sulfur-containing carrier, a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter; the alkalescent mineral material, the iron-based material and the microorganism growth promoter are dispersed and filled in the sulfur-containing carrier; the sulfur-containing carrier is a porous carrier material loaded with sulfur.
The self-activated nitrogen and phosphorus removal carrier material comprises a sulfur-containing carrier, and a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter which are dispersedly filled in the sulfur-containing carrier, wherein the self-activated nitrogen and phosphorus removal carrier material has loose particles, rough surface, large specific surface area and high uniformity, so that the self-activated nitrogen and phosphorus removal material has high nitrogen removal efficiency and stable nitrogen removal effect.
In some of these embodiments, the self-activating denitrification and dephosphorization carrier material is prepared by boiling granulation of a sulfur-containing carrier, a weakly basic mineral material, an iron-based material, and a microbial growth promoter.
The boiling granulation is to make the material in the granulator suspend in a fluidized circulation flow by the action of hot air flow to achieve uniform mixing, at the same time, spray mist binder to wet the material in the container to make the material coagulate into loose small particles, at the same time, because the hot air flow dries the material efficiently, the moisture is evaporated continuously, the powder is coagulated continuously, the process is repeated to form ideal and uniform multi-micropore spherical particles, and the three procedures of mixing, granulating and drying are completed in the container at one time. The sulfur-containing carrier, the alkalescent mineral material, the iron-based material and the microorganism growth promoter are prepared by boiling granulation, and sulfur in the sulfur-containing carrier is heated and melted to serve as a binder in a system, so that the sulfur-containing carrier, the alkalescent mineral material, the iron-based material and the microorganism growth promoter are uniformly mixed and granulated, the specific surface area and the uniformity of the self-activated nitrogen and phosphorus removal carrier material are further improved, and the nitrogen and phosphorus removal effect is better.
In some embodiments, the mass ratio of the sulfur-containing carrier, the weakly alkaline mineral material, the iron-based material and the microorganism growth promoter is (1-20): (1-10): (1-5): (1-5). The component proportion of the self-activated denitrification and dephosphorization carrier material is in the range, and the denitrification effect is better. Further, the mass ratio of the sulfur-containing carrier to the weakly alkaline mineral material to the iron-based material to the microbial growth promoter is (10-20): (5-10): (1-3): (1-3). Furthermore, the mass ratio of the sulfur-containing carrier to the weakly alkaline mineral material to the iron-based material to the microbial growth promoter is 10:5:1: 1.
The porous carrier material is used as a porous framework, can further improve the specific surface area of the self-activated nitrogen and phosphorus removal carrier material, and is matched with other components, so that all the components of the self-activated nitrogen and phosphorus removal carrier material are uniformly dispersed, and the improvement of the nitrogen removal effect is facilitated. In some of these embodiments, the porous support material is selected from at least one of porous biochar, diatomaceous earth, sepiolite, and zeolite. In some of these embodiments, the porous support material has a porosity of 50% to 75%. Optionally, the porous support material has a porosity of 50%, 55%, 60%, 65%, 70%, or 75%.
In some of these embodiments, the mass ratio of porous support material to sulfur is 1: (1-10). Optionally, the mass ratio of porous support material to sulphur is 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9 or 1: 10.
In some of these embodiments, the porous support material has a particle size of 100 mesh to 200 mesh.
The alkalescent mineral material can adjust the pH balance of the sewage. In some of these embodiments, the weakly basic mineral material is selected from at least one of magnesium hydroxide and magnesium oxide. Compared with the traditional carbonate, such as limestone and the like, the magnesium hydroxide and the magnesium oxide have alkalescence, and the effect of stabilizing the pH value is better when the sewage is treated, so that the treated sewage can be prevented from being acidified, and an alkalescence environment (the pH value is 7.5-8.0) is created, thereby inhibiting the generation of hydrogen sulfide in the denitrification process.
The solubility of dissolved oxygen is one of the key factors that limit the denitrification reaction, and when the concentration of dissolved oxygen in an aqueous solution is high, the denitrification is limited. In embodiments of the present invention, the iron-based material is a reducing substance that can act as an oxygen scavenger to reduce the adverse effect of dissolved oxygen on denitrification.
The microbial growth promoter can promote the growth of microbes, thereby improving the denitrification efficiency. In some of these embodiments, the microbial growth promoters include sodium thiosulfate, magnesium chloride, and ferrous sulfate. The sodium thiosulfate can rapidly provide an electron donor required by denitrifying microorganisms; the magnesium chloride and the ferrous sulfate can rapidly provide magnesium and iron trace elements required by growth and reproduction of denitrifying microorganisms, and can synchronously remove phosphorus. Researches show that the denitrification effect is better when the sodium thiosulfate, the magnesium chloride and the ferrous sulfate are compounded and used.
In some embodiments, the mass ratio of the sodium thiosulfate to the magnesium chloride to the ferrous sulfate is (10-20): (5-10): (1-5). Further, the mass ratio of the sodium thiosulfate to the magnesium chloride to the ferrous sulfate is (10-15): (5-8): (1-3). Furthermore, the mass ratio of the sodium thiosulfate to the magnesium chloride to the ferrous sulfate is 10:5: 1.
In some of these embodiments, the specific surface area of the self-activated denitrification and dephosphorization support material is 5m2/g～300m2(ii) in terms of/g. Further, the specific surface area of the self-activated denitrification and dephosphorization carrier material is 5m2/g～50m2/g、50m2/g～100m2/g、100m2/g～200m2(ii)/g or 200m2/g～300m2/g。
The autotrophic denitrification carrier material is compounded by using a sulfur-containing carrier and a weakly alkaline mineral material as main raw materials, and the total nitrogen is removed through the autotrophic denitrification process of denitrification functional bacteria loaded on the surface of the sulfur-containing carrierNeutralizing H with microorganism growth promoter+The metal ions generated in the process precipitate phosphate radicals to realize synchronous phosphorus removal. The reaction principle is as follows:
50NO3 -+55S0+38H2O+20CO2+4NH4 +→25N2↑+55SO4 2-+4C5H7O2N+64H+；
Fe3++PO4 3-→FePO4↓；
Mg2++PO4 3-+NH4 +→MgNH4PO4↓。
referring to fig. 1, in another embodiment of the present invention, a method for preparing the above-mentioned self-activated denitrification and dephosphorization carrier material is also provided, which includes the following steps S100 to S300.
Step S100: mixing and granulating the alkalescent mineral material, the iron-based material and the microbial growth promoter to prepare the raw meal balls.
In some of these embodiments, the particle size of the weakly basic mineral material, the iron-based material, and the microbial growth promoter are each independently in the range of 100 mesh to 200 mesh.
In some embodiments, the mass ratio of the weakly alkaline mineral material to the iron-based material to the microbial growth promoter is (5-10): (1-5): (1-5).
In some of these embodiments, the green pellets have a particle size of 3mm to 5 mm. Optionally, the green pellets have a particle size of 3mm, 3.5mm, 4mm, 4.5mm, or 5 mm.
Step S200: the sulfur-containing support is heated until the sulfur therein melts.
Specifically, the heating temperature is 130 ℃ to 160 ℃. The heating time is 10 min-60 min.
Step S300: and (3) boiling and granulating the heated sulfur-containing carrier and the raw material balls to prepare the self-activated nitrogen and phosphorus removal carrier material.
Specifically, the boiling granulation process is carried out in a boiling granulator. Putting the raw material balls into a boiling granulator, and under the action of hot air flow, enabling the raw material balls to flow in a suspension manner; and (3) feeding the molten sulfur-containing carrier into a boiling granulator from a spray gun of the boiling granulator, mixing the molten sulfur-containing carrier with the raw material balls, and cooling and solidifying the mixture to obtain the self-activated nitrogen and phosphorus removal carrier material.
In some of these embodiments, the method of preparing the sulfur-containing support comprises the steps of:
mixing liquid sulfur with porous carrier material, cooling and forming to prepare the sulfur-containing carrier.
The porous carrier material can be wrapped by the liquid sulfur by mixing the liquid sulfur with the porous carrier material and cooling and forming. The prepared sulfur-containing carrier has high porosity, can be uniformly dispersed with other components, increases the contact area with sewage, and improves the denitrification rate and denitrification effect of the self-activated denitrification and dephosphorization carrier material.
The invention also provides an application of the self-activated denitrification and dephosphorization carrier material in sewage treatment.
In some of the embodiments, the self-activated denitrification and dephosphorization carrier material can be used for treating wastewater with low carbon-nitrogen ratio.
A method for treating wastewater with low carbon-nitrogen ratio comprises the following steps:
adding the self-activated denitrification and dephosphorization carrier material into a water treatment reactor, and performing acclimatization and biofilm formation treatment;
and introducing wastewater to be treated into the water treatment reactor after the biofilm formation for denitrification.
By adopting the self-activated nitrogen and phosphorus removal carrier material, the treatment method of the wastewater with the low carbon-nitrogen ratio has high nitrogen removal efficiency and stable nitrogen removal effect, and can obviously reduce the total nitrogen content in the wastewater after treatment.
The following are specific examples.
Example 1:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 2:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:3 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 3:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:4 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 4:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (5) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier prepared in the step (4) into a boiling granulator according to the mass ratio of 1:5, and boiling and granulating to prepare the self-activated nitrogen and phosphorus removal carrier material.
Example 5:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:1 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 6:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing zeolite and liquid sulfur in a mass ratio of 1:1, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 7:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium oxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 8:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 16:6:3 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 9:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 1:1:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to a mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 10:
the preparation process of the carrier material for the self-activated denitrification and dephosphorization in the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing limestone, reducing zero-valent iron powder and a microorganism growth promoter according to a mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 11:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the embodiment is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium carbonate, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(5) And (3) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
Example 12:
the preparation of the support material of this example was as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) The sulfur-containing carrier, the magnesium hydroxide, the reducing zero-valent iron powder and the microorganism growth promoter are uniformly mixed according to the mass ratio of 10:5:1:1, heated and mixed at 130 ℃, and then cooled and formed to prepare the self-activated nitrogen and phosphorus removal carrier material.
Comparative example 1:
the preparation process of the denitrification and dephosphorization carrier material of the comparative example is as follows: uniformly mixing elemental sulfur powder and limestone according to the mass ratio of 3:1, heating at 130 ℃ for 20min, and naturally cooling, solidifying and molding to obtain the carrier material.
Comparative example 2:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the comparative example is as follows:
(1) mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(2) Uniformly mixing magnesium hydroxide, reducing zero-valent iron powder and a microorganism growth promoter according to the mass ratio of 5:1:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(3) Heating sulfur at 130 deg.C for 20min until the sulfur is molten.
(4) And (3) adding the raw material balls prepared in the step (2) and the molten sulfur in the step (3) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activity nitrogen and phosphorus removal carrier material of the comparative example.
Comparative example 3:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the comparative example is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Mixing and compounding sodium thiosulfate, magnesium chloride and ferrous sulfate according to the mass ratio of 10:5:1 to obtain the microbial growth promoter for later use.
(3) Uniformly mixing magnesium hydroxide and a microorganism growth promoter according to a mass ratio of 5:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(4) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until sulfur is molten.
(5) And (4) adding the raw material balls prepared in the step (3) and the sulfur-containing carrier in the step (4) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activity nitrogen and phosphorus removal carrier material in the comparative example.
Comparative example 4:
the preparation process of the self-activated denitrification and dephosphorization carrier material of the comparative example is as follows:
(1) mixing the porous biochar and liquid sulfur in a mass ratio of 1:5, and then cooling and forming to enable the sulfur to wrap the porous biochar to obtain the sulfur-containing carrier.
(2) Uniformly mixing magnesium hydroxide and reducing zero-valent iron powder according to the mass ratio of 5:1, and pelleting to obtain raw material balls with the particle size of 3 mm.
(3) Heating the sulfur-containing carrier prepared in the step (1) at 130 ℃ for 20min until the sulfur is molten.
(4) And (3) adding the raw material balls prepared in the step (2) and the sulfur-containing carrier in the step (3) into a boiling granulator according to the mass ratio of 1:2 for boiling granulation, and preparing the self-activated nitrogen and phosphorus removal carrier material.
The carrier materials of examples 1 to 12 and comparative examples 1 to 4 were packed in a filtration column having a diameter of 7cm and a packing height of 75cm, respectively. The packing volume was 2.8L and the packing rate was 60%, and the test conditions were as follows:
the total nitrogen concentration of the inlet water is 20mg/L, the total phosphorus concentration is 0.5mg/L, the pH value is 7-8, the dissolved oxygen concentration is 5-6 mg/L, and the retention time of the inlet water is 30 min. The results of the runs are shown in Table 1.
TABLE 1 test results for the support materials of examples 1 to 12 and comparative examples 1 to 4
As can be seen from the relevant data in Table 1, the raw materials of the self-activated denitrification and dephosphorization carrier materials prepared in the examples 1-12 comprise a sulfur-containing carrier, a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter, and the denitrification and dephosphorization effects of the self-activated denitrification and dephosphorization carrier materials of the examples 1-12 are better than those of the self-activated denitrification and dephosphorization carrier materials of the comparative examples 1-4 in the same treatment time.
In the self-activated denitrification and dephosphorization carrier materials of embodiments 1 to 3, the mass ratio of the sulfur-containing carrier, the weakly alkaline mineral material, the iron-based material and the microorganism growth promoter is (1 to 20): (1-10): (1-5): (1-5), compared with the self-activated denitrification and dephosphorization carrier materials of the examples 4 and 5, the denitrification effect is better.
Compared with the embodiments 1 and 8, in the self-activated denitrification and dephosphorization carrier material of the embodiment 9, the mass ratio of the sodium thiosulfate, the magnesium chloride and the ferrous sulfate in the microorganism growth promoter is 1:1:1, and is not (10-20): (5-10): in the range of (1-5), the denitrification effect of the carrier material for denitrification and dephosphorization with nitrogen and phosphorus in example 9 is slightly inferior to that of the carrier materials for denitrification and dephosphorization with nitrogen and phosphorus in examples 1 and 8.
Compared with the example 1, the examples 10 and 11 respectively replace the magnesium hydroxide with limestone or magnesium carbonate, the pH value of the effluent of the sewage treated by the self-activated nitrogen and phosphorus removal carrier material of the examples 10 and 11 is obviously reduced, and H in the effluent is obviously reduced2The concentration of S increases.
The activated denitrification and dephosphorization carrier material of the embodiment 12 is prepared by adopting a traditional mixed forming mode, and compared with the activated denitrification and dephosphorization carrier material of the embodiment 1, the denitrification effect is slightly poor, but is better than that of comparative examples 1-4. This shows that the carrier material prepared by the boiling granulation method can further improve the denitrification effect of the carrier material.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. It should be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the present invention as set forth in the appended claims. Therefore, the protection scope of the present invention should be subject to the content of the appended claims, and the description and the drawings can be used for explaining the content of the claims.
Claims (10)
1. An auto-active denitrification and dephosphorization carrier material is characterized by comprising a sulfur-containing carrier, a weakly alkaline mineral material, an iron-based material and a microorganism growth promoter; the alkalescent mineral material, the iron-based material and the microorganism growth promoter are filled in the sulfur-containing carrier in a dispersing way; the sulfur-containing carrier is a porous carrier material loaded with sulfur.
2. The activated denitrification and dephosphorization carrier material according to claim 1, wherein said activated denitrification and dephosphorization carrier material is prepared by boiling granulation of said sulfur-containing carrier, said weakly basic mineral material, said iron-based material and said microorganism growth promoter.
3. The self-activated denitrification and dephosphorization carrier material according to claim 1, wherein the mass ratio of the sulfur-containing carrier, the weakly alkaline mineral material, the iron-based material and the microorganism growth promoter is (1-20): (1-10): (1-5): (1-5).
4. The support material for denitrification and dephosphorization according to claim 1, wherein said porous support material is selected from at least one of porous biochar, diatomaceous earth, sepiolite and zeolite;
and/or, the weakly basic mineral material is selected from at least one of magnesium hydroxide and magnesium oxide;
and/or the iron-based material is selected from at least one of reducing zero-valent iron powder and sponge iron powder.
5. The support material of claim 1, wherein the microorganism growth promoter comprises sodium thiosulfate, magnesium chloride and ferrous sulfate.
6. The carrier material for denitrification and dephosphorization according to claim 5, wherein in the microbial growth promoter, the mass ratio of the sodium thiosulfate to the magnesium chloride to the ferrous sulfate is (10-20): (5-10): (1-5).
7. The support material for phosphorus and nitrogen removal of any one of claims 1 to 6, wherein the specific surface area of the support material for phosphorus and nitrogen removal is 5m2/g～300m2/g。
8. The preparation method of the self-activated denitrification and dephosphorization carrier material according to any one of claims 1 to 7, which is characterized by comprising the following steps:
mixing and granulating the weakly alkaline mineral material, the iron-based material and the microorganism growth promoter to prepare raw material balls;
heating the sulfur-containing support to melt the sulfur therein;
and boiling and granulating the heated sulfur-containing carrier and the raw material balls to prepare the self-activated nitrogen and phosphorus removal carrier material.
9. The method for preparing the self-activated denitrification and dephosphorization carrier material according to claim 8, wherein the method for preparing the sulfur-containing carrier comprises the following steps:
mixing liquid sulfur with the carrier material, cooling and forming to prepare the sulfur-containing carrier.
10. The use of the self-activated denitrification and dephosphorization carrier material according to any one of claims 1 to 7 in sewage treatment.
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