CN116495889B - Constructed wetland treatment system and treatment method for enhanced denitrification - Google Patents
Constructed wetland treatment system and treatment method for enhanced denitrification Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000945 filler Substances 0.000 claims abstract description 92
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000001301 oxygen Substances 0.000 claims abstract description 58
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 58
- 239000002689 soil Substances 0.000 claims abstract description 38
- 239000002351 wastewater Substances 0.000 claims abstract description 37
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical class O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 34
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims abstract description 29
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002808 molecular sieve Substances 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 16
- 235000019738 Limestone Nutrition 0.000 claims abstract description 12
- 239000006028 limestone Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 50
- 241000196324 Embryophyta Species 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 26
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- 241000894006 Bacteria Species 0.000 claims description 15
- 239000004343 Calcium peroxide Substances 0.000 claims description 13
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 claims description 13
- 235000019402 calcium peroxide Nutrition 0.000 claims description 13
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 12
- 229910021536 Zeolite Inorganic materials 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 10
- 239000010457 zeolite Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 9
- 235000005273 Canna coccinea Nutrition 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 6
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- 230000008569 process Effects 0.000 claims description 5
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 4
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 3
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 3
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 3
- 239000001099 ammonium carbonate Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 235000014676 Phragmites communis Nutrition 0.000 claims description 2
- 241000555922 Potamogeton crispus Species 0.000 claims description 2
- 230000004913 activation Effects 0.000 claims description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 150000002603 lanthanum Chemical class 0.000 claims description 2
- 229920006395 saturated elastomer Polymers 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 208000035985 Body Odor Diseases 0.000 claims 1
- 206010055000 Bromhidrosis Diseases 0.000 claims 1
- 240000008555 Canna flaccida Species 0.000 claims 1
- 241000252229 Carassius auratus Species 0.000 claims 1
- 241000360771 Coreana Species 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 46
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 23
- 244000005700 microbiome Species 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 3
- 230000012010 growth Effects 0.000 abstract description 2
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- 238000006243 chemical reaction Methods 0.000 description 13
- 230000001276 controlling effect Effects 0.000 description 9
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 241000234587 Canna Species 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000010865 sewage Substances 0.000 description 7
- 239000010802 sludge Substances 0.000 description 7
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- 229910002651 NO3 Inorganic materials 0.000 description 5
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 5
- 238000006396 nitration reaction Methods 0.000 description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000009935 nitrosation Effects 0.000 description 3
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- 239000000243 solution Substances 0.000 description 3
- 244000063299 Bacillus subtilis Species 0.000 description 2
- 235000014469 Bacillus subtilis Nutrition 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical group S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 241001260874 Sargassum horneri Species 0.000 description 2
- 240000001085 Trapa natans Species 0.000 description 2
- QALQXPDXOWOWLD-UHFFFAOYSA-N [N][N+]([O-])=O Chemical compound [N][N+]([O-])=O QALQXPDXOWOWLD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012767 functional filler Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 230000008635 plant growth Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 235000009165 saligot Nutrition 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000498251 Hydrilla Species 0.000 description 1
- NULAJYZBOLVQPQ-UHFFFAOYSA-N N-(1-naphthyl)ethylenediamine Chemical compound C1=CC=C2C(NCCN)=CC=CC2=C1 NULAJYZBOLVQPQ-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000195474 Sargassum Species 0.000 description 1
- 244000275012 Sesbania cannabina Species 0.000 description 1
- 241000246044 Sophora flavescens Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005541 medical transmission Effects 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000004005 nitrosamines Chemical class 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005375 photometry Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/106—Carbonaceous materials
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Water Supply & Treatment (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Botany (AREA)
- Biotechnology (AREA)
- Inorganic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Biological Wastes In General (AREA)
Abstract
The invention belongs to the technical field of wastewater treatment, and discloses an artificial wetland treatment system and a treatment method for enhanced denitrification. The constructed wetland treatment system comprises a vertical subsurface flow constructed wetland, a horizontal subsurface flow constructed wetland and an ecological pond; the vertical submerged artificial wetland is provided with a soil layer, a modified zeolite molecular sieve filler layer, an oxygen-releasing filler layer and a ceramic filler layer; planting submerged plants on the soil layer of the vertical submerged artificial wetland; a soil layer and a limestone filler layer are arranged on the horizontal submerged artificial wetland; emergent aquatic plants are planted on the soil layer of the horizontal submerged artificial wetland. The artificial wetland treatment system can promote the growth of microorganisms, promote the nitrification and denitrification in the artificial wetland treatment system, realize the advanced treatment of nitrogen and improve the nitrogen removal rate. The constructed wetland treatment system is used for treating the nitrogenous wastewater, and the nitrogen removal rate is more than 99.5%.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to an artificial wetland treatment system and a treatment method for enhanced denitrification.
Background
Among the existing sewage treatment technologies, the constructed wetland sewage treatment technology has the advantages of stable effluent quality, strong nitrogen-containing wastewater removal capability, low capital construction and operation costs, aesthetic value and the like, and is concerned at home and abroad. Constructed wetlands generally consist of plants, substrates and microorganisms, and are primarily intended to purify contaminants by physical, chemical and biological synergism. When sewage flows through the constructed wetland, the substrate and microorganisms thereof can perform some physical or chemical reactions with the sewage, such as absorption, adsorption, filtration, ion exchange, complexation reaction and the like, so as to effectively remove pollutants in the water body.
The constructed wetlands are mainly of four types: the four types of the flow-metering type, the horizontal flow-metering type, the vertical flow-metering type and the mixed type. The constructed wetland system is used as a complete ecological system, has good material circulation in the constructed wetland system, can generate better economic benefit and ecological benefit, is a practical and novel sewage treatment technology which is continuously researched, applied and developed, is suitable for the national conditions of China, is suitable for the domestic sewage treatment of vast villages and towns and communities, and has extremely wide application prospect. However, the research reports that the constructed wetland has high removal rate of organic matters, suspended matters and polluted bacteria, but has relatively low removal rate of nitrogen and phosphorus, generally kept at about 40-60%, and unstable. In addition, the constructed wetland technology has many defects such as large occupied area, long hydraulic retention time, great influence on the treatment effect due to temperature change and plant growth maturity, lack of optimal design specifications and parameters, potential disease transmission media and the like, which seriously influence the removal of pollutants by the wetland and reduce the water quality of the effluent, so that further improvement and perfection are needed. The single type of constructed wetland often cannot achieve good wastewater treatment effect, so that the surface flow type, the horizontal submerged flow type and the vertical submerged flow type constructed wetland are matched in practical application. However, most of the designs at present only combine the surface flow type, the horizontal flow type and the vertical flow type artificial wetlands at will, and the reactions and the functions which occur in each artificial wetland are similar, the effects are simple superposition, and the high-efficiency denitrification effect cannot be achieved. In addition, in the constructed wetland with denitrification as a main purpose, the carbon source is a main limiting factor of the denitrification of the wetland, and the denitrification effect of the wetland can be effectively improved by adding the exogenous carbon source. However, the method is not properly put into the process, cannot strengthen the denitrification effect, and can influence the nitrification reaction, the growth of plants and the absorption of ammonia nitrogen. Therefore, there is a need to provide an artificial wetland treatment system for enhancing the denitrification effect, which solves the current situation that the denitrification efficiency is not ideal.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides an artificial wetland treatment system and a treatment method for enhanced denitrification. The artificial wetland treatment system provided by the invention can strengthen the denitrification effect, realize the advanced treatment of nitrogen and improve the nitrogen removal rate.
The first aspect of the invention provides an artificial wetland treatment system for enhanced denitrification.
Specifically, an artificial wetland treatment system for enhanced denitrification sequentially comprises: vertical subsurface flow constructed wetland, horizontal subsurface flow constructed wetland and ecological pond;
the vertical submerged artificial wetland is provided with a soil layer, a modified zeolite molecular sieve filler layer, an oxygen-releasing filler layer and a ceramic filler layer from top to bottom in sequence; the oxygen-releasing filler layer consists of oxygen-releasing filler, wherein the oxygen-releasing filler comprises calcium peroxide, modified activated carbon, aluminum oxide and an adhesive; planting submerged plants on the soil layer of the vertical submerged artificial wetland;
the horizontal submerged artificial wetland is provided with a soil layer and a limestone filler layer from top to bottom in sequence; emergent aquatic plants are planted on the soil layer of the horizontal submerged artificial wetland.
The artificial wetland treatment system provided by the invention sequentially comprises a vertical subsurface flow type artificial wetland, a horizontal subsurface flow type artificial wetland and an ecological pond along the water flow direction. By designing the structure of the vertical subsurface flow constructed wetland, according to the first aspect, submerged plants are planted in the soil layer, and not only can part of ammonia nitrogen be adsorbed by the submerged plants, but also a large amount of oxygen can be released in water, so that the oxygen content of the vertical subsurface flow constructed wetland is improved. In the second aspect, by selecting the composition of the oxygen-releasing filler layer and disposing it between the modified zeolite molecular sieve filler layer and the ceramic filler layer, it is possible to ensure that the middle and bottom of the vertical subsurface flow constructed wetland have sufficient oxygen. Sufficient oxygen can promote the nitration reaction, inhibit the denitrification reaction, and ammonia nitrogen can be quickly converted into nitrate and nitrite when the nitrogenous wastewater passes through the vertical submerged artificial wetland. Nitrate and nitrite enter the horizontal subsurface flow constructed wetland along with the nitrate, the horizontal subsurface flow constructed wetland is used for planting emergent aquatic plants, stems of the emergent aquatic plants vertically grow in water, roots grow in bottom mud, firstly, the emergent aquatic plants have certain capacities of adsorbing and enriching nitrate and nitrite, the pollutants can be directly removed, secondly, the emergent aquatic plants have developed root systems and certain oxygen transmission capacity, the residual ammonia nitrogen which is not completely reacted in the front can be converted into nitrate and nitrite through a nitration reaction in a root zone, finally, the emergent aquatic plants are in an oxygen-enriched state in the root zone due to the particularity of the emergent aquatic plants, the emergent aquatic plants are in an anoxic state in a zone far away from the root zone, and the emergent aquatic plants are in a complete anaerobic state in a zone far away from the root zone. And finally, introducing the treated wastewater into an ecological pond for further treatment.
In the vertical submerged artificial wetland, the oxygen-releasing filler comprises calcium peroxide, modified activated carbon, aluminum oxide and an adhesive; through modifying the activated carbon, the pore rate of the activated carbon is improved, and then the activated carbon is matched with the use of aluminum oxide, so that the calcium oxide can be fully filled in the activated carbon, the filling rate and the slow release effect of the activated carbon are improved, and the stable and sufficient oxygen is ensured when the vertical subsurface flow constructed wetland is operated.
It is understood that in the vertical subsurface flow constructed wetland, the modified zeolite molecular sieve filler layer is composed of modified zeolite molecular sieve filler, and the ceramic filler layer is composed of ceramic filler. In the horizontal submerged artificial wetland, the limestone filler layer is composed of limestone filler.
Preferably, in the vertical subsurface flow constructed wetland, the thickness ratio of the soil layer to the modified zeolite molecular sieve filler layer, the oxygen-releasing filler layer and the ceramic filler layer is 1: (1-3): (1-3): (1-3); further preferably, the thickness ratio of the soil layer to the modified zeolite molecular sieve filler layer, the oxygen-releasing filler layer and the ceramic filler layer is 1: (1.5-2.5): (1.5-2.5): (1.5-2.5).
Preferably, the preparation method of the modified zeolite molecular sieve is as shown in (a) or (b):
(a) Placing natural zeolite, sodium hydroxide, lanthanum salt and aluminum salt into ammonium bicarbonate solution, and performing hydrothermal reaction at 150-180 ℃ and 2-4 MPa to obtain the modified zeolite molecular sieve;
(b) Mixing zeolite with S-containing material 2- Mixing the substances and sodium carbonate solution until zeolite is saturated by adsorption, taking out, and drying in an oven at 100-200 ℃ for 2-24 hours; finally, heating to 400-600 ℃ for 2-8 hours for activation to obtain the modified zeolite molecular sieve.
Preferably, the S-containing 2- The substance is hydrogen sulfide.
Wherein, the preparation method (b) uses biological hydrogen sulfide to produce molecular sieve, and is a more sustainable and more environment-friendly molecular sieve production method compared with the traditional method using fossil fuel derived chemicals.
Preferably, the preparation method of the oxygen-releasing filler comprises the following steps:
and (3) treating the activated carbon with concentrated sulfuric acid, calcining to obtain modified activated carbon, mixing the modified activated carbon with calcium peroxide, standing, adding aluminum oxide and an adhesive, mixing, and drying to obtain the oxygen-releasing filler. The active carbon is treated by concentrated sulfuric acid and then calcined, so that the pore rate of the active carbon can be improved to the greatest extent, the adsorption efficiency of oxygen is improved, and the occurrence of nitration reaction is promoted.
Preferably, the binder is polyvinyl alcohol.
Preferably, the mass ratio of the modified activated carbon to the calcium peroxide is 1: (0.5-2).
Preferably, the mass ratio of the modified activated carbon to the aluminum oxide to the adhesive is 1: (0.1-0.5): (0.005-0.05); further preferably, the mass ratio of the modified activated carbon to the aluminum oxide to the binder is 1: (0.2-0.3): (0.01-0.03).
Preferably, the treatment with concentrated sulfuric acid takes 0.5 to 3 hours; the calcination process is that the calcination is carried out for 0.5 to 3 hours at the temperature of 300 to 500 ℃.
Further preferably, the preparation method of the oxygen-releasing filler comprises the following steps:
the activated carbon is calcined for 0.5 to 3 hours at the temperature of 300 to 500 ℃ after being treated by concentrated sulfuric acid for 0.5 to 3 hours, so as to obtain modified activated carbon; mixing the modified activated carbon with calcium peroxide according to the following ratio of 1: (0.5-2), then standing for 0.5-3 days, then adding aluminum oxide and adhesive, mixing, and drying to obtain the oxygen-releasing filler.
Preferably, the vertical submerged artificial wetland is added with a first compound microbial agent, wherein the first compound microbial agent comprises ammoniated bacteria and/or nitrosation bacteria; and adding a second composite microbial agent into the horizontal submerged artificial wetland, wherein the second composite microbial agent comprises denitrifying bacteria.
Preferably, the first compound microbial agent and water are mixed according to (0.005-5) g:1L of the microbial agent is evenly mixed and added into the vertical submerged artificial wetland, and the second composite microbial agent and water are added into the vertical submerged artificial wetland according to the following weight ratio of (0.005-5) g: mixing 1L of the materials uniformly, and adding the mixture into the horizontal submerged artificial wetland.
The corresponding compound microbial agents are added into the vertical and horizontal subsurface flow constructed wetlands, so that the quantity of ammoniated bacteria and nitrosated bacteria in the water body of the vertical subsurface flow constructed wetlands and the quantity of denitrified bacteria in the horizontal subsurface flow constructed wetlands can be obviously improved, various bacteria participating in nitrogen circulation can keep relatively stable quantity in different seasons of spring, summer and autumn, the nitrogen circulation rate and efficiency can be improved, the nitrogen circulation of the water body is promoted by directly regulating the quantity of the nitrogen circulation bacteria in the water body, and the problems that the bacterial quantity of sewage is slowly increased in the treatment process of a wetland system, the influence of external environment is large, the treatment effect is unstable and the like can be solved.
Preferably, the submerged plant is at least one selected from the group consisting of Sargassum horneri, sophora flavescens, sargassum horneri, and Sargassum gracile.
Preferably, the emergent aquatic plant is at least one selected from reed, canna, and iris.
Preferably, emergent aquatic plants are planted in the ecological pond. The emergent aquatic plant is not particularly limited. Ornamental or edible fishes can be cultivated in the ecological pond.
The second aspect of the invention provides an application of the constructed wetland treatment system.
In particular to application of the artificial wetland treatment system in treating nitrogen-containing wastewater.
In a third aspect, the present invention provides a method of enhanced denitrification.
Specifically, the treatment method for enhanced denitrification adopts the constructed wetland treatment system for treatment, and comprises the following steps: introducing the nitrogenous wastewater into the vertical submerged artificial wetland, and controlling the residence time to be 1-5 days; then introducing the water into the horizontal submerged artificial wetland, and controlling the residence time to be 3-7 days; finally, the waste water is introduced into an ecological pond.
Preferably, the sludge hydrolysis supernatant is added to the horizontal submerged type constructed wetland when the constructed wetland treatment system is operated. By adding the sludge hydrolysis supernatant as a carbon source for denitrification reaction in the horizontal submerged artificial wetland, the denitrification effect of the wetland can be effectively improved, and the influence of external carbon sources on the micro-ecological environment of the wetland can be reduced.
Preferably, a treatment method for enhanced denitrification comprises the following steps: introducing the nitrogenous wastewater into the vertical submerged artificial wetland, and controlling the residence time to be 1-3 days; then introducing the sludge into the horizontal submerged artificial wetland, and adding the sludge hydrolysis supernatant, wherein the residence time is controlled to be 4-7 days; finally, the waste water is introduced into an ecological pond.
In the treatment process, the nitrogen removal effect can be effectively improved by the fact that the residence time of the nitrogenous wastewater in the vertical subsurface flow constructed wetland is shorter than that in the horizontal subsurface flow constructed wetland. In the treatment method, the reaction in the vertical submerged artificial wetland mainly comprises nitration reaction, and the residence time of the nitrogenous wastewater is controlled to be 1-3 days, so that on one hand, the wastewater is ensured to have high fluidity, and the dissolved oxygen in the water is more sufficient; on the other hand, the relatively complete nitration reaction can be ensured. The reaction in the horizontal submerged artificial wetland mainly comprises denitrification reaction, so that the residence time of the nitrogenous wastewater is controlled to be longer, and the denitrification reaction can be more completely carried out by prolonging the reaction time; oxygen is also consumed as much as possible to further promote the denitrification reaction.
It is understood that the nitrogen-containing wastewater can be discharged from the system after being treated by the ecological pond, and can also be produced in a ecological system.
Compared with the prior art, the invention has the following beneficial effects:
the artificial wetland treatment system provided by the invention sequentially comprises a vertical subsurface flow type artificial wetland, a horizontal subsurface flow type artificial wetland and an ecological pond along the water flow direction. Through designing the structure of the constructed wetland treatment system, the growth of microorganisms can be promoted, the nitrification and denitrification in the constructed wetland treatment system are promoted, the advanced treatment of nitrogen is realized, and the nitrogen removal rate is improved. The nitrogen-containing wastewater is treated by adopting the constructed wetland treatment system provided by the invention, and the nitrogen removal rate is more than 99.5%.
Drawings
FIG. 1 is a cross-sectional view of the constructed wetland treatment system in example 1;
reference numerals:
100 is a vertical submerged artificial wetland, 110 is a soil layer, 120 is a modified zeolite molecular sieve filler layer, 130 is an oxygen-releasing filler layer, 140 is a ceramic filler layer, and 150 is a submerged plant; 200 is a horizontal submerged artificial wetland, 210 is a soil layer, 220 is a limestone filler layer, and 230 is emergent aquatic plants; 300 is a ecological pond and 310 is an emergent aquatic plant.
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples will be presented. It should be noted that the following examples do not limit the scope of the invention.
The starting materials, reagents or apparatus used in the following examples are all available from conventional commercial sources or may be obtained by methods known in the art unless otherwise specified.
Example 1
The embodiment provides a preparation method of oxygen release filler, which comprises the following specific steps:
the activated carbon is calcined for 1 hour at 400 ℃ after being treated by concentrated sulfuric acid for 2 hours, so as to obtain modified activated carbon; then weighing 100 parts (the same is followed by the following) of modified activated carbon and 100 parts of calcium peroxide, mixing the mixture fully, standing for 2 days, adding 25 parts of aluminum oxide and 2 parts of polyvinyl alcohol, mixing for 30min at 150 rpm, and drying after mixing uniformly to obtain the oxygen-releasing filler.
Example 2
The embodiment provides a preparation method of oxygen release filler, which comprises the following specific steps:
the activated carbon is calcined for 2 hours at 350 ℃ after being treated by concentrated sulfuric acid for 1.5 hours, so as to obtain modified activated carbon; then weighing 100 parts of modified activated carbon and 150 parts of calcium peroxide, mixing, standing for 2 days after fully mixing, adding 30 parts of aluminum oxide and 1 part of polyvinyl alcohol, mixing for 40min at 150 rpm, and drying after uniformly mixing to obtain the oxygen release filler.
Example 3
The embodiment provides an artificial wetland treatment system for enhanced denitrification, and the cross section of the artificial wetland treatment system is shown in figure 1. Constructed wetland treatment system includes along the direction of rivers in proper order: a vertical subsurface flow constructed wetland 100, a horizontal subsurface flow constructed wetland 200 and an ecological pond 300.
The vertical submerged artificial wetland 100 is provided with a soil layer 110, a modified zeolite molecular sieve filler layer 120, an oxygen-releasing filler layer 130 and a ceramic filler layer 140 from top to bottom. The thickness ratio of the soil layer 110 to the modified zeolite molecular sieve filler layer 120, the oxygen-releasing filler layer 130 and the ceramic filler layer 140 is 1:2:2:2; the oxygen-releasing filler layer 130 is composed of the oxygen-releasing filler prepared in example 1, and submerged plants 150, specifically, potamogeton crispus and hydrilla verticillata, are planted on the soil layer 110 of the vertical submerged type constructed wetland 100.
The preparation method of the modified zeolite molecular sieve comprises the following steps: (1) Weighing 100g of natural zeolite powder with the granularity of 260-300 meshes, washing the natural zeolite powder with deionized water, and placing the natural zeolite powder in a hydrothermal reaction kettle; respectively weighing 1.74g of sodium hydroxide, 2.34g of lanthanum nitrate and 49.39g of aluminum chloride, dissolving in 100g of deionized water, stirring to prepare a mixed water-soluble salt solution, and adding the mixed water-soluble salt solution into a hydrothermal reaction kettle; weighing 10g of ammonium bicarbonate and 1000g of deionized water, respectively adding into a hydrothermal reaction kettle, and uniformly stirring with the natural zeolite powder and the mixed water-soluble salt solution which are added previously to form a mixed solution. (2) After the hydrothermal reaction kettle is closed, an automatic stirring paddle is started, the stirring rotating speed is controlled to be 800 revolutions per minute, the temperature is raised after the rotating speed is adjusted, the temperature is raised to be 150 ℃ according to the temperature raising rate of 2-3 ℃ per minute, the pressure of the reaction kettle can be adjusted through a pressure release valve during the period, the pressure of the reaction kettle is controlled to be 2-3 MPa, and the reaction time is maintained for 5 hours. And naturally cooling to room temperature after the hydrothermal reaction is finished, opening the reaction kettle, centrifugally separating and filtering to obtain a precipitate, washing the precipitate with deionized water for 2-3 times, and drying the precipitate in a constant-temperature oven at 100 ℃ to obtain modified molecular sieve functional filler raw powder. (3) Weighing 100g of modified molecular sieve functional filler raw powder, 1g of sesbania powder, 10g of cement powder and 5g of corncob powder, mechanically stirring uniformly, adding a proper amount of water, continuously stirring, putting into an extruder for extrusion after agglomerating, extruding different shapes according to different grinding tools, and simultaneously cutting into required lengths. The shape of the preparation method is five-rib wheel type, the length is controlled to be 10-15 mm, the diameter of a cylinder is 12mm, and the modified zeolite molecular sieve is finally obtained after the preparation method is dried in a hot air box at 120 ℃.
A horizontal submerged artificial wetland 200, wherein a soil layer 210 and a limestone filler layer 220 are sequentially arranged from top to bottom; the thickness ratio of soil layer 210 to limestone filler layer 220 is 1:2. Emergent aquatic plants 230, specifically canna and iris, are planted on the soil layer 210 of the horizontal submerged artificial wetland 200.
The ecological pond 300 is planted with emergent aquatic plants 310, specifically canna.
The embodiment also provides a processing method for enhanced denitrification, which comprises the following steps: introducing the nitrogenous wastewater into the vertical subsurface flow constructed wetland 100, and controlling the residence time of the nitrogenous wastewater in the vertical subsurface flow constructed wetland 100 to be 3 days; then introducing the wastewater into the horizontal subsurface flow constructed wetland 200, adding sludge hydrolysis supernatant (the addition amount is 5wt% of the nitrogenous wastewater), and controlling the residence time of the nitrogenous wastewater in the horizontal subsurface flow constructed wetland 200 to be 5 days; and introducing the finally treated water into an ecological pond, and continuously staying for 7 days.
Example 4
Example 4 differs from example 3 in that the oxygen-releasing filler prepared in example 2 was used instead of the oxygen-releasing filler prepared in example 1, and the rest of the system structure and the treatment method were the same as those in example 3.
Example 5
Example 5 differs from example 3 in that it further comprises the steps of:
mixing 0.1g of a first compound microbial agent and water: 1L of the microbial agent is evenly mixed and added into the vertical submerged artificial wetland, and the second composite microbial agent and water are added according to the weight ratio of 0.1g: mixing 1L of the materials uniformly, and adding the mixture into the horizontal submerged artificial wetland. The first composite microbial agent comprises ammoniation bacteria (bacillus subtilis) and nitrosation bacteria (nitrosation monad), and the second composite microbial agent comprises denitrifying bacteria (bacillus subtilis).
Comparative example 1
The comparative example provides a preparation method of oxygen-releasing filler, which comprises the following steps:
the activated carbon is calcined for 1 hour at 400 ℃ after being treated by concentrated sulfuric acid for 2 hours, so as to obtain modified activated carbon; then weighing 100 parts (the same is followed by the following) of modified activated carbon and 100 parts of calcium peroxide, mixing the modified activated carbon and the 100 parts of calcium peroxide by mass, standing for 2 days after fully mixing, adding 2 parts of polyvinyl alcohol, mixing for 30min at 150 rpm, and drying after uniformly mixing to obtain the oxygen-releasing filler.
Comparative example 2
The comparative example provides a preparation method of oxygen-releasing filler, which comprises the following steps:
100 parts (the same applies below) of active carbon and 100 parts of calcium peroxide are weighed and mixed, the mixture is placed for 2 days after full mixing, 25 parts of aluminum oxide and 2 parts of polyvinyl alcohol are added, the mixture is mixed for 30 minutes at 150 revolutions per minute, and the mixture is dried after uniform mixing, so that the oxygen-releasing filler is prepared.
Comparative example 3
Comparative example 3 differs from example 3 in that the oxygen-releasing filler prepared in comparative example 1 was used instead of the oxygen-releasing filler prepared in example 1, and the remaining system configuration and the treatment method were the same as those of example 3.
Comparative example 4
Comparative example 4 differs from example 3 in that the oxygen-releasing filler prepared in comparative example 2 was used instead of the oxygen-releasing filler prepared in example 1, and the remaining system configuration and the treatment method were the same as those of example 3.
Comparative example 5
This comparative example provides an artificial wetland treatment system, and is different from example 3 in the structure of the vertical subsurface flow type artificial wetland. The method comprises the following steps: constructed wetland treatment system includes along the direction of rivers in proper order: vertical subsurface flow constructed wetland, horizontal subsurface flow constructed wetland and ecological pond.
The vertical submerged artificial wetland is provided with a soil layer, a modified zeolite molecular sieve filler layer, a ceramic filler layer and an oxygen-releasing filler layer from top to bottom. The thickness ratio of the soil layer to the modified zeolite molecular sieve filler layer to the oxygen-releasing filler layer to the ceramic filler layer is 1:2:2:2; the oxygen-releasing filler layer consists of the oxygen-releasing filler prepared in the embodiment 1, and submerged plants, in particular, water caltrop and black algae of the leaf blade are planted on the soil layer of the vertical submerged artificial wetland.
The horizontal submerged artificial wetland is provided with a soil layer and a limestone filler layer from top to bottom in sequence; the thickness ratio of the soil layer to the limestone filler layer is 1:2. Emergent aquatic plants, in particular canna and iris, are planted on the soil layer of the horizontal submerged artificial wetland.
Canna is planted in the ecological pond.
The comparative example also provides a treatment method for enhanced denitrification, comprising the following steps: introducing the nitrogenous wastewater into the vertical subsurface constructed wetland, and controlling the residence time of the nitrogenous wastewater in the vertical subsurface constructed wetland to be 3 days; then introducing the wastewater into the horizontal submerged artificial wetland, adding sludge hydrolysis supernatant (the addition amount is 5wt% of the nitrogenous wastewater), and controlling the residence time of the nitrogenous wastewater in the horizontal submerged artificial wetland to be 5 days; and introducing the finally treated water into an ecological pond, and continuously staying for 7 days.
Comparative example 6
This comparative example provides an artificial wetland treatment system, and is different from example 3 in that plants planted on a vertical-type artificial wetland and a horizontal-type artificial wetland are different. The method comprises the following steps: constructed wetland treatment system includes along the direction of rivers in proper order: vertical subsurface flow constructed wetland, horizontal subsurface flow constructed wetland and ecological pond.
The vertical submerged artificial wetland is provided with a soil layer, a modified zeolite molecular sieve filler layer, an oxygen-releasing filler layer and a ceramic filler layer from top to bottom. The thickness ratio of the soil layer to the modified zeolite molecular sieve filler layer to the oxygen-releasing filler layer to the ceramic filler layer is 1:2:2:2; the oxygen-releasing filler layer consists of the oxygen-releasing filler prepared in the embodiment 1, and emergent aquatic plants, in particular canna and iris, are planted on the soil layer of the vertical submerged artificial wetland.
The horizontal submerged artificial wetland is provided with a soil layer and a limestone filler layer from top to bottom in sequence; the thickness ratio of the soil layer to the limestone filler layer is 1:2. Submerged plants, in particular, water caltrop and black algae of leaf blade are planted on the soil layer of the horizontal submerged type constructed wetland.
Canna is planted in the ecological pond.
The comparative example also provides a treatment method for enhanced denitrification, comprising the following steps: introducing the nitrogenous wastewater into the vertical subsurface constructed wetland, and controlling the residence time of the nitrogenous wastewater in the vertical subsurface constructed wetland to be 3 days; then introducing the wastewater into the horizontal submerged artificial wetland, adding sludge hydrolysis supernatant (the addition amount is 5wt% of the nitrogenous wastewater), and controlling the residence time of the nitrogenous wastewater in the horizontal submerged artificial wetland to be 5 days; and introducing the finally treated water into an ecological pond, and continuously staying for 7 days.
Product effect test
The constructed wetland treatment systems provided in examples 3 to 5 and comparative examples 3 to 6 were constructed in a reduced scale, respectively, wherein the volume of the vertical-type constructed wetland was 50L, and the volume ratio of the vertical-type constructed wetland to the horizontal-type constructed wetland and the ecological pond was about 1:1:1. And waiting for half a month after the constructed system is used, and after plants survive and grow normally, operating, and monitoring and detecting the nitrogenous wastewater. Preparing artificial nitrogenous wastewater (main component is NH) 4 Cl and tap water), ammonia nitrogen (NH 4 + -N) at an initial concentration of 248.0mg/L. Respectively adding 50L of nitrogenous wastewater into the artificial wetland treatment system, and detecting ammonia Nitrogen (NH) in the ecological pond after the nitrogenous wastewater is treated according to the treatment method 4 + -N), nitro nitrogen (NO 3 - -N) and nitrous Nitrogen (NO) 2 - -N) content, the nitrogen removal rate is calculated. Wherein ammonia Nitrogen (NH) 4 + -N) content is determined by means of a nals reagent spectrophotometry; nitro Nitrogen (NO) 3 - -N) content is determined by uv spectrophotometry; nitrosamines (NO) 2 - -N) content was determined by N- (1-naphthyl) -ethylenediamine photometry. The test results are shown in Table 1.
TABLE 1
As can be seen from the data in Table 1, the constructed wetland treatment systems provided in examples 3 to 5 of the present invention can efficiently remove nitrogen, and the nitrogen removal rate after treatment is more than 99.5% and can be as high as 99.85%. In example 5, the composite microbial agent is additionally and pertinently added, so that the denitrification is more efficient, is less influenced by the environment, and can be stabilized. And the nitrogen removal rate of the constructed wetland treatment systems provided in comparative examples 3 to 6 is far lower than that of the examples. Therefore, the composition of the oxygen release filler layer in the vertical subsurface flow constructed wetland and the structure of the vertical subsurface flow constructed wetland have obvious influence on the denitrification effect. The soil layer of the vertical subsurface flow constructed wetland and the type of plants planted on the soil layer of the horizontal subsurface flow constructed wetland also directly influence the denitrification effect.
Claims (12)
1. An artificial wetland treatment system, which is characterized by comprising, in order along the direction of water flow: vertical subsurface flow constructed wetland, horizontal subsurface flow constructed wetland and ecological pond;
the vertical submerged artificial wetland is provided with a soil layer, a modified zeolite molecular sieve filler layer, an oxygen-releasing filler layer and a ceramic filler layer from top to bottom in sequence; the oxygen-releasing filler layer consists of oxygen-releasing filler, wherein the oxygen-releasing filler comprises calcium peroxide, modified activated carbon, aluminum oxide and an adhesive; planting submerged plants on the soil layer of the vertical submerged artificial wetland;
the horizontal submerged artificial wetland is provided with a soil layer and a limestone filler layer from top to bottom in sequence; emergent aquatic plants are planted on the soil layer of the horizontal submerged artificial wetland.
2. The constructed wetland treatment system according to claim 1, wherein in the vertical subsurface flow constructed wetland, the thickness ratio of the soil layer to the modified zeolite molecular sieve filler layer, the oxygen-releasing filler layer and the ceramic filler layer is 1: (1-3): (1-3): (1-3).
3. The constructed wetland treatment system according to claim 1 or 2, wherein the modified zeolite molecular sieve is prepared by a method as shown in (a) or (b):
(a) Placing natural zeolite, sodium hydroxide, lanthanum salt and aluminum salt into ammonium bicarbonate solution, and performing hydrothermal reaction at 150-180 ℃ and 2-4 MPa to obtain the modified zeolite molecular sieve;
(b) Mixing zeolite with S-containing material 2- Mixing the substances and sodium carbonate solution until zeolite is saturated by adsorption, taking out, and drying in an oven at 100-200 ℃ for 2-24 hours; finally, heating to 400-600 ℃ for 2-8 hours for activation to obtain the modified zeolite molecular sieve.
4. The constructed wetland treatment system according to claim 1 or 2, wherein the preparation method of the oxygen-releasing filler is as follows:
and (3) treating the activated carbon with concentrated sulfuric acid, calcining to obtain modified activated carbon, mixing the modified activated carbon with calcium peroxide, standing, adding aluminum oxide and an adhesive, mixing, and drying to obtain the oxygen-releasing filler.
5. The constructed wetland treatment system according to claim 4, wherein the mass ratio of the modified activated carbon to the calcium peroxide is 1: (0.5-2).
6. The constructed wetland treatment system according to claim 4, wherein the mass ratio of the modified activated carbon to the aluminum oxide to the binder is 1: (0.1-0.5): (0.005-0.05).
7. The constructed wetland treatment system according to claim 4, wherein the treatment time with concentrated sulfuric acid is 0.5 to 3 hours; the calcination process is that the calcination is carried out for 0.5 to 3 hours at the temperature of 300 to 500 ℃.
8. The constructed wetland treatment system according to claim 1 or 2, wherein the vertical submerged artificial wetland is dosed with a first composite microbial agent comprising ammoniated bacteria and/or nitrosylated bacteria; and adding a second composite microbial agent into the horizontal submerged artificial wetland, wherein the second composite microbial agent comprises denitrifying bacteria.
9. The constructed wetland treatment system according to claim 1 or 2, wherein the submerged plant is at least one selected from the group consisting of bromhidrosis, kucao, black algae, goldfish algae, curly pondweed, and black algae.
10. The constructed wetland treatment system according to claim 1 or 2, wherein said emergent aquatic plant is selected from at least one of reed, canna, iris coreana.
11. Use of the constructed wetland treatment system according to any one of claims 1 to 10 for treating nitrogen-containing wastewater.
12. A method of enhanced denitrification treatment, characterized in that the method is performed by using the constructed wetland treatment system according to any one of claims 1 to 10, comprising the steps of: introducing the nitrogenous wastewater into the vertical submerged artificial wetland, and controlling the residence time to be 1-5 days; then introducing the water into the horizontal submerged artificial wetland, and controlling the residence time to be 3-7 days; finally, the waste water is introduced into an ecological pond.
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