CN116040794A - Deep denitrification and dephosphorization constructed wetland filler and preparation method and application thereof - Google Patents
Deep denitrification and dephosphorization constructed wetland filler and preparation method and application thereof Download PDFInfo
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- CN116040794A CN116040794A CN202211674353.0A CN202211674353A CN116040794A CN 116040794 A CN116040794 A CN 116040794A CN 202211674353 A CN202211674353 A CN 202211674353A CN 116040794 A CN116040794 A CN 116040794A
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- 239000000945 filler Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 45
- 239000011593 sulfur Substances 0.000 claims abstract description 45
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 35
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000010865 sewage Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 18
- 238000011049 filling Methods 0.000 claims description 15
- 230000001651 autotrophic effect Effects 0.000 claims description 9
- 239000010802 sludge Substances 0.000 claims description 7
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 2
- 239000003830 anthracite Substances 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 27
- 229910052698 phosphorus Inorganic materials 0.000 description 27
- 239000011574 phosphorus Substances 0.000 description 27
- 229910052757 nitrogen Inorganic materials 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 244000005700 microbiome Species 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- -1 aluminum ions Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000027756 respiratory electron transport chain Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- LLSDKQJKOVVTOJ-UHFFFAOYSA-L calcium chloride dihydrate Chemical compound O.O.[Cl-].[Cl-].[Ca+2] LLSDKQJKOVVTOJ-UHFFFAOYSA-L 0.000 description 1
- 229940052299 calcium chloride dihydrate Drugs 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 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
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/345—Biological treatment of water, waste water, or sewage characterised by the microorganisms used for biological oxidation or reduction of sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/004—Apparatus and plants for the biological treatment of water, waste water or sewage comprising a selector reactor for promoting floc-forming or other bacteria
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/07—Alkalinity
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- 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
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- 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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a deep denitrification and dephosphorization constructed wetland filler and a preparation method thereof, comprising the following steps: (1) heating and melting sulfur, and pumping the sulfur into a reaction kettle; (2) Adding bauxite powder and magnetite powder into a reaction kettle, uniformly stirring, and then cooling, granulating and forming to obtain deep denitrification and dephosphorization constructed wetland filler; in the deep denitrification and dephosphorization constructed wetland filler, the mass percentages of the components are as follows: 60-80% of sulfur, 15-40% of bauxite and 5-20% of magnetite. The invention also discloses application of the deep denitrification and dephosphorization constructed wetland filler in sewage denitrification. The constructed wetland filler has high-efficiency denitrification and dephosphorization effects.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a deep denitrification and dephosphorization constructed wetland filler, and a preparation method and application thereof.
Background
Rural environmental management has been increasingly emphasized in recent years, and is especially prominent and sensitive to water environment management. Because of the problems of difficult construction, operation and maintenance fund guarantee, lack of professional technicians, improper treatment process selection and the like, rural domestic sewage treatment becomes a prominent short board for current rural human living environment improvement. Especially, the sewage treatment technology aiming at the water quality sensitive area with higher total nitrogen and total phosphorus removal requirements is relatively lacking. In many local standards, strict requirements are imposed on the discharge of total nitrogen, total phosphorus and the like of rural domestic sewage treatment devices.
The rural domestic sewage treatment process and device applied in China at present are basically contracted versions of urban domestic sewage treatment process and device, such as AAO, AO and other processes and devices commonly used in urban domestic sewage treatment, and are also commonly applied in rural domestic sewage treatment. However, rural domestic sewage has the characteristics of large water quality fluctuation, less carbon source, low carbon-nitrogen (C/N) ratio and the like. For domestic sewage with low C/N ratio, the enhanced denitrification is realized through nitrification and denitrification, and a carbon source is often required to be additionally added, or the denitrification is realized through novel denitrification technologies such as short-range nitrification and denitrification, anaerobic ammonia oxidation and the like in a highly automatic control mode, a refined management mode and the like, so that the system is complex in maintenance and management, high in fineness and high in cost, and is difficult to popularize in rural areas. The existing technologies such as AAO, AO and the like applied in rural areas are basically technologies combined with biomembrane methods and the like, microorganisms are basically hung on fillers, the sludge discharge amount is small, and the aim of removing phosphorus is difficult to achieve through traditional anaerobic phosphorus release and aerobic excessive phosphorus absorption and a large amount of sludge discharge. Therefore, in water quality sensitive areas with higher requirements on total nitrogen and total phosphorus removal, the problem that the total nitrogen and the total phosphorus are difficult to reach standards is commonly existed. The technology for developing high-efficiency deep denitrification and dephosphorization is one of the ways for solving the problems, the constructed wetland is widely applied to rural domestic sewage treatment as a deep treatment process, but has the defects of large occupied area and the like, the sewage entering the constructed wetland is sewage after being subjected to front-end microbial treatment such as AO and AAO processes, COD (chemical oxygen demand) which is easy to utilize by the microorganisms is basically utilized completely, the rest COD possibly is organic matters which are difficult to biodegrade, and the effluent is sewage with low carbon nitrogen ratio and high total nitrogen and total phosphorus after being subjected to AO and AAO processes. Therefore, the conventional filler is difficult to remove nitrogen and phosphorus. It is necessary to develop efficient reinforced denitrification and dephosphorization wetland filler so as to improve the denitrification and dephosphorization capability of the constructed wetland and reduce the occupied area of the wetland.
Sulfur autotrophic denitrification is used as a high-efficiency autotrophic denitrification technology, and is not required to be additionally provided with a carbon source, so that the sulfur autotrophic denitrification technology is widely researched recently, but pure sulfur is easy to run off, water and acid are produced by denitrification, and the problem of microbial denitrification is inhibited in the acid environment. Therefore, the high-efficiency denitrification material needs to be prepared by combining with other materials, and the high-efficiency denitrification and dephosphorization functions are required to be simultaneously realized, and the selection and preparation method of the material are key.
Disclosure of Invention
The invention provides a deep denitrification and dephosphorization constructed wetland filler and a preparation method thereof.
The technical scheme of the invention is as follows:
a preparation method of a deep denitrification and dephosphorization constructed wetland filler comprises the following steps:
(1) Heating and melting sulfur, and pumping the sulfur into a reaction kettle;
(2) Adding bauxite powder and magnetite powder into a reaction kettle, uniformly stirring, and then cooling, granulating and forming to obtain deep denitrification and dephosphorization constructed wetland filler;
in the deep denitrification and dephosphorization constructed wetland filler, the mass percentages of the components are as follows: 60-80% of sulfur, 15-40% of bauxite and 5-20% of magnetite.
The acid generated by the autotrophic denitrification of sulfur is utilized by bauxite in the filler to generate aluminum ions, the aluminum ions are just combined with phosphorus in the wastewater, so that the total phosphorus in the wastewater is greatly reduced, the bauxite can provide 'alkalinity' to remove phosphorus, so that the pH of the wetland is maintained in a neutral environment, the pH stability of a denitrification and dephosphorization filler region is maintained, the growth of microorganisms is facilitated, and the removal of total nitrogen and total phosphorus is further promoted in turn.
Magnetite is used as an electron transfer medium to promote electron transfer between microorganisms and the filler and between the filler and pollutants, promote degradation of the pollutants, and are more favorable for adhesion of the microorganisms.
The sulfur is industrial sulfur with purity more than 99%.
The grain size of the bauxite powder is 40-100 meshes; in bauxite, al 2 O 3 The content is 60-70%, and the mass ratio of Al to Si is not less than 12.
The particle size of the magnetite powder is 40-100 meshes.
Preferably, the particle size of the deep denitrification and dephosphorization constructed wetland filler is 4-10mm.
Preferably, in step (1), the heat fusion temperature is 115-125 ℃.
Preferably, in the step (2), the reaction vessel is heated to 140-200 ℃ before the bauxite powder and the magnetite powder are added.
Through sulfur melting, bauxite and magnetite are added into a reaction kettle at a higher temperature for mixing, cooling and granulating, the mechanical strength of filler particles can be effectively improved, the filler is not scattered in water for a long time, an adhesive and a foaming agent are not needed to be added, the content of effective components for denitrification and dephosphorization in the filler is increased, and the service life of the filler is prolonged.
Further, in the step (2), before bauxite powder and magnetite powder are added, the reaction kettle is heated to 140-180 ℃.
The temperature of the reaction kettle is too high, for example, the temperature exceeds 180 ℃, and the denitrification and dephosphorization effects of the prepared filler are reduced.
The invention also provides the deep denitrification and dephosphorization constructed wetland filler prepared by adopting the method.
The invention also provides application of the deep denitrification and dephosphorization constructed wetland filler in sewage denitrification, which comprises the following steps:
filling the deep denitrification and dephosphorization constructed wetland filler into the constructed wetland, wherein the filling volume of the deep denitrification and dephosphorization constructed wetland filler is 0.5-3 times of the designed treatment water volume; after filling, the domesticated autotrophic sludge is inoculated in the deep denitrification and dephosphorization artificial wetland filling area.
Preferably, the deep denitrification and dephosphorization constructed wetland filler is filled at the position 10-20% of the length of the constructed wetland from the water inlet of the constructed wetland.
The deep denitrification and dephosphorization constructed wetland filler can be used independently or can be mixed with auxiliary fillers such as gravel, ceramsite, volcanic rock, anthracite and the like. If the artificial wetland filler is mixed with auxiliary filler, the volume ratio of the filler to the auxiliary filler of the artificial wetland for deep denitrification and dephosphorization is 1-5:1.
Compared with the prior art, the invention has the beneficial effects that:
(1) Due to the synergistic effect of the components, the deep denitrification and dephosphorization artificial wetland filler basically has no accumulation of nitrite in the denitrification process, can maintain the pH of the wetland in a neutral environment, maintains the pH stability of a denitrification and dephosphorization filler region, and is more beneficial to the growth of microorganisms;
(2) Through sulfur melting, bauxite and magnetite are added at a higher temperature for mixing, and finally cold granulation is carried out, the mechanical strength of filler particles can be effectively improved through the special preparation process, the filler is not scattered in water for a long time, an adhesive and a foaming agent are not added, and the service life of the filler is prolonged.
(3) The deep denitrification and dephosphorization constructed wetland filler can be used for not only newly-built constructed wetland, but also upgrading and reforming a large number of existing constructed wetland, so that the total nitrogen and total phosphorus removal rate of the constructed wetland is greatly improved, and the water quality of effluent is improved.
Drawings
FIG. 1 is a graph showing comparison of total nitrogen water quality of inlet and outlet water of the constructed wetland during operation of application example 1 and application comparative example 1 for 3 months;
fig. 2 is a graph showing the comparison of total phosphorus quality of inlet and outlet water of the constructed wetland during the operation of application example 1 and application comparative example 1 for 3 months.
Detailed Description
In the following examples, al in bauxite 2 O 3 The content is 60-70%, and the mass ratio of Al to Si is not less than 12.
Example 1
Filler 1: heating sulfur with purity higher than 99% in a sulfur melting kettle 1 to 120 ℃ for melting, pumping into a reaction kettle 2 after melting into liquid, adding 60-mesh bauxite and 60-mesh magnetite at 160 ℃ into the reaction kettle 2, stirring for 2h, pumping into a granulating device, cooling with circulating cooling water, granulating, and forming spheres with particle size of 4-10mm. The mass percentages of the components are as follows: 60% of sulfur, 30% of bauxite and 10% of magnetite.
Not only sulfur: bauxite: the mass ratio of magnetite is 6:3:1.
example 2
Filler 2: heating sulfur with purity higher than 99% in a sulfur melting kettle 1 to 120 ℃ for melting, pumping into a reaction kettle 2 after melting into liquid, adding 60-mesh bauxite and 60-mesh magnetite at 190 ℃, stirring for 2 hours, pumping into a granulating device, cooling with circulating cooling water, granulating, and forming into spheres with particle size of 4-10mm. The mass percentages of the components are as follows: 60% of sulfur, 30% of bauxite and 10% of magnetite.
Example 3
And (3) filling material: sulfur with purity more than 99%, 60 meshes of bauxite and 60 meshes of magnetite are heated to 120 ℃ in a sulfur melting kettle 1 to be melted after being uniformly stirred, stirred for 2 hours, pumped into granulation equipment, cooled by circulating cooling water to be granulated and formed into spheres with particle size of 4-10mm. The mass percentages of the components are as follows: 60% of sulfur, 30% of bauxite and 10% of magnetite.
Comparative example 1
Filler 4: 6-9mm sulfur particles with purity of more than 99%, 60-mesh bauxite and 60-mesh magnetite are uniformly mixed at normal temperature, and the mass percentages of the components are as follows: 60% of sulfur, 30% of bauxite and 10% of magnetite.
Comparative example 2
Filler 5: heating sulfur with purity higher than 99% in a sulfur melting kettle 1 to 120 ℃ for melting, pumping into a reaction kettle 2 after melting into liquid, wherein the temperature of the reaction kettle 2 is 160 ℃, adding 60-mesh bauxite, stirring for 2 hours, pumping into a granulating device, cooling by circulating cooling water, granulating, and forming into spheres with particle size of 4-10mm.
Sulfur: the mass ratio of bauxite is 6:3, filler 5 is the same as filler 1 except that magnetite is not added.
Comparative example 3
Filler 6: heating sulfur with purity higher than 99% in a sulfur melting kettle 1 to 120 ℃ for melting, pumping into a reaction kettle 2 after melting into liquid, wherein the temperature of the reaction kettle 2 is 160 ℃, adding magnetite with 60 meshes, stirring for 2 hours, pumping into a granulating device, and cooling by circulating cooling water for granulating to form spheres with particle size of 4-10mm.
Sulfur: the mass ratio of magnetite is 6:1, filler 6 is the same as filler 1 except that bauxite is not added.
Comparative example 4
Filler 7: is granular sulfur with the grain diameter of 6-9mm (the purity of the sulfur is more than 99%).
Comparative example 5
Filler 8: is 60 mesh bauxite.
Comparative example 6
Filler 9: is 60 mesh magnetite.
Denitrification test
Adding the above 9 fillers with the weight of 10g into 9 anaerobic bottles with 250mL respectively, inoculating domesticated autotrophic sludge with the weight of 10mL into the above 9 anaerobic bottles, adding 200mL of manually configured nitrate-containing wastewater, placing on an air bath shaking table with the rotation speed of 120 rpm and the temperature of 25 ℃. During the culture, the anaerobic bottle is taken out every 24 hours, kept stand for 40 minutes, the supernatant is poured out, and 200ml of new water is added. After 15 days of continuous culture film hanging and 3 days of stabilization, the water distribution time is changed to be 24 hours each, and the water quality after 9 anaerobic bottles are treated is measured.
Manual water distribution: glucose 50mg/L, sodium nitrate 303.6mg/L (total nitrogen 50 mg/L), potassium dihydrogen phosphate 43.8mg/L (total phosphorus 10 mg/L), magnesium sulfate heptahydrate 10mg/L, calcium chloride dihydrate 5mg/L, water distribution with tap water, pH of the water inlet adjusted to 7.0, and artificial water distribution C/N ratio of 1:1, SO 4 2- 70.2mg/L. Nitrogen was added to the water distribution for 30 minutes before the anaerobic jar was added.
The results are shown in Table 1:
TABLE 1 Water quality after treatment with 9 fillers (initial total Nitrogen 50mg/L, total phosphorus 10 mg/L)
The results show that the filler prepared by sulfur, bauxite and magnetite has excellent denitrification and dephosphorization performance, and the removal effect is greater than that of the filler prepared by sulfur, bauxite and sulfur, magnetite respectively. During denitrification, nitrite is not accumulated basically. And the pH value of the filler prepared from sulfur, bauxite and magnetite is basically neutral after denitrification treatment.
The removal effect comparison of the filler 1 and the filler 3 shows that the denitrification and dephosphorization effects of the filler prepared by firstly melting sulfur, then mixing the sulfur with bauxite and magnetite in a reaction kettle with a higher temperature (140-180 ℃) and granulating by circulating cooling water are better than those of the filler prepared by firstly mixing the materials and then melting and granulating at a relatively low temperature. However, if the temperature is too high, for example, exceeds 180 ℃, the denitrification effect of the prepared filler is reduced, for example, the denitrification effect of filler 2 is poorer than that of filler 1.
The denitrification effect comparison of the filler 1 and the filler 4 shows that the denitrification effect of the reinforced denitrification and dephosphorization filler prepared by the method is better than that of the mixture of the independent materials.
Application example 1
The AO (anoxic-aerobic process) -constructed wetland with the design treatment capacity of 2.8t/d is used for treating domestic sewage, the constructed wetland is designed to be 5m long, 1.2m wide and 1.1m deep, and is a horizontal subsurface flow constructed wetland, the deep denitrification and dephosphorization constructed wetland filler prepared in the embodiment 1 is filled at the position 0.5m away from the water inlet of the constructed wetland, and the filling volume is 1 time of the design water quantity, namely 2.8m 3 Then the deep denitrification and dephosphorization filling material is prepared according to the volume ratio: gravel was 3:1 and the gravel are mixed, and the particle size of the gravel is 6-10mm. After filling, inoculating domesticated 2L sulfur autotrophic sludge in a deep denitrification and dephosphorization filling area, and filling ceramsite in the rest part of the wetland: the gravel is prepared from the following components in percentage by volume: 1, the particle size of the ceramsite is 4-10mm, and the particle size of the gravel is 6-10mm. The artificial wetland is not planted with plants. Introducing water according to the water inflow of 1.4t/d initially, hanging a film for 15 days, changing the water inflow to 2.8t/d after the water quality of the water outlet is stable, sampling 1 time per week, detecting the water quality of the water inlet and the water outlet, and continuously running for 3 months.
Comparative example 1 was used
The AO (anoxic-aerobic process) -constructed wetland with the treatment capacity of 2.8t/d is designed to treat domestic sewage, the constructed wetland has the design size of 5 meters long, 1.2 meters wide and 1.1 meters deep, is a horizontal subsurface flow constructed wetland,
the constructed wetland is filled with ceramsite: the gravel is prepared from the following components in percentage by volume: 1, wherein the particle size of the ceramsite is 4-10mm, the particle size of the gravel is 6-10mm, and 2L of sulfur autotrophic sludge acclimated after filling is inoculated. The artificial wetland is not planted with plants. Introducing water according to the water inflow of 1.4t/d initially, hanging a film for 15 days, changing the water inflow to 2.8t/d after the water quality of the water outlet is stable, sampling 1 time per week, detecting the water quality of the water inlet and the water outlet, and continuously running for 3 months.
Application example 1 and application comparative example 1, the AO process water inflow is the same regulating tank water inflow, the AO process operation parameters and conditions are the same, and the AO effluent quality is basically relevant. AO goes out water, and artificial wetland intaking quality of water is all: COD: 22-40 mg/L, ammonia nitrogen: 0.2-1.2 mg/L, total nitrogen 40.5-80.5 mg/L, total nitrogen mean value 66.3mg/L, total phosphorus 8-15.2mg/L, total phosphorus mean value 11.06mg/L and pH 6.8-7.5.
The operation is continued for 3 months, the water quality of the constructed wetland effluent of application example 1 is: 21-38 mg/L, ammonia nitrogen: 0.19-1.1mg/L, pH 6.9-8.2, total nitrogen and total phosphorus in and out water as shown in figures 1 and 2, total nitrogen in and out water: 3.39-12.7mg/L, the average total nitrogen value of the effluent is 5.83mg/L, the total phosphorus value of the effluent is 0.48-0.92mg/L, the average total phosphorus value of the effluent is 0.66mg/L, and the average removal rates of total nitrogen and total phosphorus are respectively as follows: 91.2%, 94%.
The operation is continued for 3 months, and the water quality of the constructed wetland effluent of the application comparative example 1 is as follows, COD: 21-38 mg/L, ammonia nitrogen: 0.2-1.15mg/L, pH 6.8-7.4, total nitrogen and total phosphorus in and out water as shown in figure 1 and figure 2, total nitrogen in and out water: 36.5-65.7mg/L, total nitrogen average value of 55.1mg/L, total phosphorus of effluent of 5.68-11.1mg/L, total phosphorus average value of effluent of 7.95mg/L, and average removal rates of total nitrogen and total phosphorus are respectively: 16.9%, 28.1%.
The foregoing embodiments have described the technical solutions and advantages of the present invention in detail, and it should be understood that the foregoing embodiments are merely illustrative of the present invention and are not intended to limit the invention, and any modifications, additions, substitutions and the like that fall within the principles of the present invention should be included in the scope of the invention.
Claims (10)
1. The preparation method of the deep denitrification and dephosphorization constructed wetland filler is characterized by comprising the following steps:
(1) Heating and melting sulfur, and pumping the sulfur into a reaction kettle;
(2) Adding bauxite powder and magnetite powder into a reaction kettle, uniformly stirring, and then cooling, granulating and forming to obtain deep denitrification and dephosphorization constructed wetland filler;
in the deep denitrification and dephosphorization constructed wetland filler, the mass percentages of the components are as follows: 60-80% of sulfur, 15-40% of bauxite and 5-20% of magnetite.
2. The method for preparing the deep denitrification and dephosphorization artificial wetland filler according to claim 1, wherein the particle size of the bauxite powder is 40-100 meshes; in bauxite, al 2 O 3 The content is 60-70%, and the mass ratio of Al to Si is not less than 12.
3. The method for preparing the deep denitrification and dephosphorization artificial wetland filler according to claim 1, wherein the particle size of the magnetite powder is 40-100 meshes.
4. The method for preparing the deep denitrification and dephosphorization artificial wetland filler according to claim 1, wherein the particle size of the deep denitrification and dephosphorization artificial wetland filler is 4-10mm.
5. The method for preparing a deep denitrification and dephosphorization artificial wetland filler according to claim 1, wherein in step (1), the heating and melting temperature is 115-125 ℃.
6. The method for preparing a deep denitrification and dephosphorization artificial wetland filler according to claim 1 or 5, wherein in step (2), the reaction kettle is heated to 140-200 ℃ before bauxite powder and magnetite powder are added.
7. A deep denitrification and dephosphorization constructed wetland filler, which is prepared by the preparation method as claimed in any one of claims 1 to 6.
8. Use of the deep denitrification and dephosphorization artificial wetland filler according to claim 7 in sewage denitrification, comprising:
filling the deep denitrification and dephosphorization constructed wetland filler into the constructed wetland, wherein the filling volume of the deep denitrification and dephosphorization constructed wetland filler is 0.5-3 times of the designed treatment water volume; after filling, the domesticated autotrophic sludge is inoculated in the deep denitrification and dephosphorization artificial wetland filling area.
9. The use according to claim 8, wherein the deep denitrification and dephosphorization constructed wetland packing is started to be filled at a position 10-20% of the length of the wetland from the water inlet of the constructed wetland.
10. The application of claim 8, wherein the deep denitrification and dephosphorization constructed wetland filler can be used alone or in combination with other auxiliary fillers, and the volume ratio of the deep denitrification and dephosphorization constructed wetland filler to the auxiliary filler is 1-5:1;
the auxiliary filler is at least one of gravel, ceramsite, volcanic rock and anthracite.
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| CN109019877A (en) * | 2018-09-21 | 2018-12-18 | 中国科学院生态环境研究中心 | Denitrogenation dephosphorizing active bio carrier, preparation method and its application |
| CN112142208A (en) * | 2020-09-23 | 2020-12-29 | 北京林业大学 | Nitrogen and phosphorus removal active biological carrier and application thereof |
| CN113522228A (en) * | 2021-07-20 | 2021-10-22 | 南京大学 | Light material for synchronous denitrification and chromium removal and preparation method and application thereof |
| CN114716109A (en) * | 2022-04-21 | 2022-07-08 | 华南理工大学 | Sewage nitrogen and phosphorus removal treatment system and process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109019877A (en) * | 2018-09-21 | 2018-12-18 | 中国科学院生态环境研究中心 | Denitrogenation dephosphorizing active bio carrier, preparation method and its application |
| CN112142208A (en) * | 2020-09-23 | 2020-12-29 | 北京林业大学 | Nitrogen and phosphorus removal active biological carrier and application thereof |
| CN113522228A (en) * | 2021-07-20 | 2021-10-22 | 南京大学 | Light material for synchronous denitrification and chromium removal and preparation method and application thereof |
| CN114716109A (en) * | 2022-04-21 | 2022-07-08 | 华南理工大学 | Sewage nitrogen and phosphorus removal treatment system and process |
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