CN114249413A - Biological carbon reinforced composite artificial wetland nitrogen and phosphorus removal system - Google Patents
Biological carbon reinforced composite artificial wetland nitrogen and phosphorus removal system Download PDFInfo
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- CN114249413A CN114249413A CN202111651517.3A CN202111651517A CN114249413A CN 114249413 A CN114249413 A CN 114249413A CN 202111651517 A CN202111651517 A CN 202111651517A CN 114249413 A CN114249413 A CN 114249413A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 72
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 44
- 239000011574 phosphorus Substances 0.000 title claims abstract description 44
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title description 5
- 229910052799 carbon Inorganic materials 0.000 title description 5
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 73
- 239000010457 zeolite Substances 0.000 claims abstract description 73
- 239000000945 filler Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005273 aeration Methods 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000010802 sludge Substances 0.000 claims abstract description 18
- 230000000813 microbial effect Effects 0.000 claims abstract description 15
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 239000010865 sewage Substances 0.000 claims description 45
- 239000002245 particle Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 210000005056 cell body Anatomy 0.000 claims description 5
- 210000004177 elastic tissue Anatomy 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 239000003610 charcoal Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 34
- 239000004912 1,5-cyclooctadiene Substances 0.000 abstract 1
- 244000005700 microbiome Species 0.000 description 28
- 241000196324 Embryophyta Species 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 231100000719 pollutant Toxicity 0.000 description 9
- 238000001179 sorption measurement Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 238000003763 carbonization Methods 0.000 description 6
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 241000234587 Canna Species 0.000 description 2
- 235000005273 Canna coccinea Nutrition 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- -1 gravel Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004060 metabolic process Effects 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 229910052649 zeolite group Inorganic materials 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
- C02F3/32—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
-
- 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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
-
- 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
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower or fuel cells
-
- 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
- C02F2301/10—Temperature conditions for biological treatment
- C02F2301/106—Thermophilic treatment
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a biochar reinforced composite artificial wetland nitrogen and phosphorus removal system, which comprises an artificial wetland, wherein a heat preservation layer is arranged outside a pond body, and the artificial wetland is provided with at least seven layers from bottom to top, which are sequentially as follows: the device comprises a precipitation zone, a first zeolite layer, an aerobic-anaerobic layer, a second zeolite layer, an aerobic layer, a mixed matrix layer and a soil layer; a heating device is arranged between the precipitation zone and the first zeolite layer; the aerobic-anaerobic layer is divided into three areas, namely an aerobic area, an anaerobic area and a water outlet area, by partition plates, and aerobic microbial fillers and anaerobic microbial fillers are respectively filled in the aerobic area and the anaerobic area; an aeration device is arranged at the bottom of the aerobic zone. Aiming at the problems of poor reoxygenation effect, low removal rate of nitrogen, phosphorus and COD, easy blockage, large influence of temperature and the like of the conventional vertical flow constructed wetland, the invention provides the sludge biochar reinforced composite constructed wetland nitrogen and phosphorus removal system which has high reoxygenation capability, good nitrogen and phosphorus removal effect, small floor area and low-temperature operation.
Description
Technical Field
The invention relates to the technical field of artificial wetlands, in particular to a biochar reinforced composite artificial wetland nitrogen and phosphorus removal system.
Background
The artificial wetland is a sewage treatment technology for purifying pollutants by simulating a natural wetland, mainly comprises artificial substrates, microorganisms and aquatic plants, and purifies sewage by the synergistic action of physics, chemistry and biology. The artificial substrate can provide a stable attachment surface for the growth of microorganisms, provide carriers and nutrient substances for aquatic plants, and can adsorb partial pollutants; the aquatic plants can directly absorb and utilize nutrient substances in the sewage, enrich some toxic and harmful substances, and can also convey oxygen to a root zone to maintain hydraulic transmission; the microorganisms degrade organic pollutants in the sewage through the metabolism of the microorganisms. The artificial wetland has the advantages of low investment, convenient management, stable treatment effect, environment beautification and the like, and has wide application prospect. At present, the method is widely applied to the pollution fields of tail water treatment of sewage plants, domestic sewage, river pollution, storm runoff and the like.
The filler is an important component of the artificial wetland, can load microorganisms, and can remove pollutants through physical and chemical adsorption. The wetland filler mainly comprises natural materials such as soil, gravel, zeolite, limestone and the like, industrial byproducts such as ash, blast furnace slag, fly ash and the like, and artificial products such as ceramsite, ceramsite filter material, plastics and the like. The conditions of the type, the pore diameter, the specific surface area, the carbon content, the filling mode and the like of the filler can influence the reoxygenation capacity of the wetland and the type and the activity of microorganisms. The reasonable selection of the types and filling modes of the fillers is beneficial to improving the reoxygenation capacity of the wetland and the removal effect of pollutants.
However, the following problems still exist in the current artificial wetland: (1) the oxygen supply capacity of the artificial wetland is insufficient, the oxygen mass transfer rate of the filler is low, so that the microorganism nitrification capacity is limited, and the ammonia nitrogen removal effect is poor. (2) The constructed wetland mainly depends on the adsorption effect of the filler on microorganisms and pollutants to purify organic matters, nitrogen and phosphorus in the sewage, but the traditional filler has less adsorption amount on the microorganisms and the pollutants, so that the microorganism has limited sewage purification effect, and the removal effect of nitrogen, phosphorus and COD in the sewage is poor. (3) The constructed wetland has longer hydraulic retention time and less microorganism load, so that the free microorganism in the wetland is large, and the wetland is easy to block. (4) The temperature of plants and microorganisms in the artificial wetland is greatly influenced, the activity of the microorganisms is influenced in cold weather, and the treatment effect of the wetland on the wastewater is reduced.
Therefore, a biochar reinforced composite artificial wetland nitrogen and phosphorus removal system is provided for solving the problems.
Disclosure of Invention
The invention aims to provide a biochar-reinforced composite constructed wetland nitrogen and phosphorus removal system to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a compound constructed wetland nitrogen and phosphorus removal system is reinforceed to biological carbon, includes constructed wetland, and constructed wetland adopts reinforced concrete structure to build, and constructed wetland's the inside lateral wall of cell body and bottom surface set up the barrier layer, and the cell body outside sets up the heat preservation, and constructed wetland is from up being provided with seven at least layers down, is in proper order: the device comprises a precipitation zone, a first zeolite layer, an aerobic-anaerobic layer, a second zeolite layer, an aerobic layer, a mixed matrix layer and a soil layer;
a heating device is arranged between the precipitation zone and the first zeolite layer;
the aerobic-anaerobic layer is divided into three areas, namely an aerobic area, an anaerobic area and a water outlet area, by partition plates, and aerobic microbial fillers and anaerobic microbial fillers are respectively filled in the aerobic area and the anaerobic area;
and an aeration device is arranged at the bottom of the aerobic zone.
Preferably, water inlet pipelines are distributed in the settling zone, and a plurality of water outlet holes are uniformly formed in the lower ends of the water inlet pipelines.
Preferably, a three-phase separator is further arranged above the inner portion of the settling zone, a funnel-shaped sewage collecting region is arranged below the settling zone, and a sludge discharge port communicated with the outer portion of the artificial wetland is arranged at the outer end of the sewage collecting region.
Preferably, the heating device is composed of heating resistance wires and a temperature control device, the heating resistance wires are uniformly distributed between the precipitation zone and the first zeolite layer and are electrically connected with the temperature control device, and the temperature control device is powered by an external power supply.
Preferably, the first zeolite layer and the second zeolite layer are both filled with zeolite, wherein: the particle size of the zeolite of the first zeolite layer is 16-32mm, and the height of the first zeolite layer is 25-35 cm;
the second zeolite layer has a zeolite particle diameter of 8-16mm and a height of 20-30 cm.
Preferably, the aerobic microbial filler is a soft filler combined by a PE central rope and polyester yarns;
the anaerobic zone microbial filler is a porous plastic hollow ball filler and comprises a large porous hollow ball and a small porous hollow ball, the small hollow ball is arranged in the large hollow ball in a suspended manner and is wound and connected with the large hollow ball through elastic fibers, and a plurality of porous ceramsite are arranged in the small hollow ball.
Preferably, a stainless steel wire mesh is arranged between the aerobic zone and the first zeolite layer and is fixed through bolts, and the aperture of the stainless steel wire mesh is smaller than 3 mm;
partition boards are arranged between the anaerobic zone and the first zeolite layer and between the water outlet zone and the first zeolite layer, and the height of the aerobic-anaerobic layer is 35cm-40 cm.
Preferably, the aeration device comprises an aeration pipe and aeration heads, wherein a plurality of aeration heads are uniformly distributed on the aeration pipe, the aeration pipe penetrates through the wall of the artificial wetland and is connected with an air compressor, and the air compressor is powered by an external power supply.
Preferably, the mixed matrix layer is prepared by mixing zeolite and sludge biochar according to the volume ratio of 1:1, and the particle size is 3-5 mm; the sludge biochar is obtained by performing high-temperature anoxic carbonization on sludge, the carbonization temperature is 500 ℃, the carbonization time is 2 hours, a stainless steel wire mesh is further arranged between the mixed matrix layer and the aerobic layer, and the height of the mixed matrix layer is 20-30 cm.
Preferably, the soil layer is planted with wetland plants, which are plants commonly used in the art, such as canna; and a water outlet is formed in one side of the soil layer and penetrates through the upper end of the wall of the artificial wetland pool.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the problems of poor reoxygenation effect, low removal rate of nitrogen, phosphorus and COD, easy blockage, large influence of temperature and the like of the conventional vertical flow constructed wetland, the invention provides the sludge biochar reinforced composite constructed wetland nitrogen and phosphorus removal system which has high reoxygenation capability, good nitrogen and phosphorus removal effect, small floor area and low-temperature operation.
The invention combines the sludge biochar and the traditional filler as the artificial wetland filler, and improves the adsorption effect of the wetland filler on pollutants such as organic matters, phosphorus and the like by utilizing the porous structure, larger porosity and specific surface area and abundant functional groups of the biochar;
according to the invention, the MBBR process is combined with the constructed wetland, so that the microorganism fixation of the constructed wetland is increased, and the denitrification effect of the wetland is improved; the oxygen content of the wetland is supplemented through aeration, and the problems of insufficient oxygen and large influence of temperature of the artificial wetland are solved.
The heating resistance wires are arranged in the artificial wetland, so that the problem that microorganisms in the artificial wetland are greatly influenced by temperature is solved, and the sewage treatment effect of the artificial wetland under the low-temperature condition in winter is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a microbial packing in an anaerobic zone in the present invention;
FIG. 3 is a diagram showing the effect of the constructed wetland on the removal of the actual domestic sewage TP in the present invention;
FIG. 4 is a diagram showing the effect of constructed wetland on the removal of TN (total nitrogen) actual domestic sewage;
FIG. 5 is a diagram showing the effect of constructed wetland in removing ammonia nitrogen from actual domestic sewage;
FIG. 6 is a diagram showing the effect of the constructed wetland on the removal of COD from the actual domestic sewage;
in the figure: 1. artificial wetland; 101. a heat-insulating layer; 11. a settling zone; 12. a first zeolite layer; 13. an aerobic-anaerobic layer; 131. an aerobic zone; 131a, aerobic microbial filler; 132. an anaerobic zone; 132a, anaerobic zone microbial packing; 133. a water outlet area; 134. a partition plate; 13-a, large hollow spheres; 13-b, elastic fibers; 13-c, small hollow spheres; 13-d, porous ceramsite; 14. a second zeolite layer; 15. an aerobic layer; 16. mixing the matrix layers; 17. a soil layer; 171. a water outlet; 2. a water inlet pipeline; 201. a water outlet hole; 3. a three-phase separator; 4. a sewage collecting area; 401. a sludge discharge port; 5. a heating device; 51. heating resistance wires; 52. a temperature control device; 53. a generator; 54. a storage battery; 55. a solar panel; 6. a stainless steel wire mesh; 7. an aeration device; 71. an aeration pipe; 72. an aeration head; 73. an air compressor; 8. wetland plants.
Detailed Description
The technical solution of the present invention will be described below with reference to the accompanying drawings and examples.
Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a compound constructed wetland nitrogen and phosphorus removal system is reinforceed to biological charcoal, includes constructed wetland 1, and constructed wetland 1 adopts reinforced concrete structure to build, and the inside lateral wall of cell body and the bottom surface of constructed wetland 1 set up the barrier layer, and the cell body outside sets up heat preservation 101, and heat preservation 101 can maintain the temperature of sewage in the pond, improves the activity of the interior microorganism of pond under the low temperature environment. The method is characterized in that: the constructed wetland 1 is provided with at least seven layers from bottom to top, and the layers are as follows: a precipitation zone 11, a first zeolite layer 12, an aerobic-anaerobic layer 13, a second zeolite layer 14, an aerobic layer 15, a mixed matrix layer 16 and a soil layer 17;
in one embodiment of the present invention, water inlet pipes 2 are distributed in the settling zone 11, and a plurality of water outlet holes 201 are uniformly formed at the lower ends of the water inlet pipes 2; a three-phase separator 3 is also arranged above the interior of the sedimentation region 11, a funnel-shaped sewage collection region 4 is arranged below the sedimentation region 11, and the outer end of the sewage collection region 4 is provided with a sludge discharge port 401 communicated with the exterior of the artificial wetland 1; the settling zone 11 is favorable for settling of solid suspended matters, aged microorganisms and extracellular polymers thereof, and the problem of blockage of the artificial wetland is relieved.
Between the precipitation zone 11 and the first zeolite layer 12 a heating means 5 is installed.
In one embodiment of the present invention, the heating device 5 is composed of a heating resistance wire 51 and a temperature control device 52, the heating resistance wire 51 is uniformly distributed between the precipitation zone 11 and the first zeolite layer 12, and is electrically connected with the temperature control device 52, the temperature control device 52 is powered by an external power source, and the external power source in the present invention can be powered by a generator 53, a storage battery 54 or a solar panel 55. The sewage flows through the heating resistance wire 51 and can be heated, the temperature of the sewage in the artificial wetland pool is improved, the activity of microorganisms in the artificial wetland is favorably maintained, the artificial wetland can normally run in a low-temperature environment in winter, the heating device runs at low temperature, and the sewage is idle when the temperature is higher.
Both the first zeolite layer 12 and the second zeolite layer 14 are filled with zeolite, wherein: the particle size of the zeolite of the first zeolite layer 12 is 16-32mm, and the height of the first zeolite layer 12 is 25-35 cm; the second zeolite layer 14 has a zeolite particle size of 8-16mm and a second zeolite layer height of 20-30 cm.
The aerobic anaerobic layer 13 is divided into three areas by partitions 133, namely an aerobic area 131, an anaerobic area 132 and a water outlet area 133, and the aerobic area 131 and the anaerobic area 132 are respectively filled with aerobic microorganism fillers 131a and anaerobic microorganism fillers 132 a.
Wherein, the aerobic microbial filler 131a is a soft filler combined by a PE central rope and polyester yarns;
the anaerobic zone microbial filler 132a is a porous plastic hollow ball filler and comprises a porous large hollow ball 13-a and a porous small hollow ball 13-c, wherein the small hollow ball 13-c is arranged in the large hollow ball 13-a in a suspended manner and is wound and connected with the large hollow ball 13-a through an elastic fiber 13-b, and a plurality of porous ceramsite 13-d are arranged in the small hollow ball 13-c. The anaerobic environment of the anaerobic zone is not thorough due to the high content of dissolved oxygen in the sewage passing through the aerobic zone, and the anaerobic filler can ensure that the microorganisms coated on the elastic fibers are exhausted by oxygen, so that the microorganisms coated on the porous ceramsite are in an absolutely anaerobic environment.
In addition, a stainless steel wire mesh 6 is arranged between the aerobic zone 131 and the first zeolite layer 12 and is fixed through bolts, and the aperture of the stainless steel wire mesh 6 is smaller than 3 mm;
a partition plate 134 is also arranged between the driving anaerobic zone 132 and the water outlet zone 133 and the first zeolite layer 12, and the height of the aerobic-anaerobic layer 13 is 35cm-40 cm.
An aeration device 7 is arranged at the bottom of the aerobic zone 131.
In an embodiment of the invention, the aeration device 7 is composed of an aeration pipe 71 and aeration heads 72, wherein a plurality of aeration heads 72 are uniformly distributed on the aeration pipe 71, the aeration pipe 71 penetrates through the wall of the artificial wetland 1 and is connected with an air compressor 73, and the air compressor 73 is powered by an external power supply which can adopt the same power supply as the temperature control device and respectively power the generator 53, the storage battery 54 or the solar panel 55. Aeration device 7 can provide oxygen for the growth and metabolism of microorganisms in aerobic zone 131.
Further, the mixed matrix layer 16 is formed by mixing zeolite and sludge biochar according to the volume ratio of 1:1, and the particle size is 3-5 mm; the sludge biochar is obtained by performing high-temperature anoxic carbonization on sludge, the carbonization temperature is 500 ℃, the carbonization time is 2 hours, the effect of removing phosphorus in sewage by the artificial wetland can be improved by adding the sludge biochar, a stainless steel wire mesh 6 is also arranged between the mixed matrix layer 16 and the aerobic layer 131, and the height of the mixed matrix layer 16 is 20-30 cm.
Further, the soil layer 17 is planted with wetland plants 8, and the wetland plants 8 are plants commonly used in the field, such as canna; a water outlet 171 is arranged on one side of the soil layer 17, and the water outlet 171 penetrates through the upper end of the wall of the artificial wetland 1.
In order to verify the strengthening effect of the sludge biochar on the artificial wetland, three groups of artificial wetlands are arranged, wherein the length of an artificial wetland pool is 10cm, the width of the artificial wetland pool is 10cm, and the height of the artificial wetland pool is 20 cm; the first group is arranged as a zeolite group, and zeolite is filled in sequence from bottom to top, wherein the first zeolite layer is 4.5cm, the second zeolite layer is 5cm, and the third zeolite layer is 5 cm; the second group is set as zeolite: the biochar is 2:1 group, and sequentially comprises a first zeolite layer, a second zeolite layer and a mixed matrix layer from bottom to top, wherein the mixed matrix layer is filled with zeolite and biochar in a volume ratio of 2:1, the first zeolite layer is 4.5cm, the second zeolite layer is 5cm, and the mixed matrix layer is 5 cm; the third set is set as zeolite: the biochar is 1:1 group, and sequentially comprises a first zeolite layer, a second zeolite layer and a mixed matrix layer from bottom to top, wherein the mixed matrix layer is filled with zeolite and biochar in a volume ratio of 1:1, the first zeolite layer is 4.5cm, the second zeolite layer is 5cm, and the mixed matrix layer is 5 cm; and (3) adopting an intermittent water feeding mode, wherein the water feeding pump operates for 3 hours and stops for 3 hours, operates for 4 times a day, has the water feeding flow of 0.28-0.42mL/min, operates for the hydraulic retention time HRT of 2-3 days, and has the operation time from 9 middle ten days to 11 middle ten days.
The attached figures 3-6 are the removing effect graphs of the three groups of artificial wetlands on TP, TN, ammonia nitrogen and COD of the actual domestic sewage.
When the following table is HRT (Rockwell temperature) 3d, the average value of experimental data is obtained by the sewage treatment detection of three groups of artificial wetlands:
as can be seen from the following table: compared with three groups of artificial wetlands, the artificial wetland with the volume ratio of 1:1 of the biochar and the zeolite mixed has the best water outlet quality, and reaches the first-level A discharge standard TP and COD in the discharge Standard of pollutants for municipal wastewater treatment plants (GB18918-2002) with the removal rate of more than 80 percent, the removal rate of ammonia nitrogen reaches more than 70 percent, and the removal rate of TN reaches more than 50 percent. The effluent quality of the artificial wetland added with the biochar is superior to that of the constructed wetland without the biochar, which shows that the biochar has good adsorption effect on TP, can also increase the nitrification and denitrification effect of the wetland and improve the denitrification effect of the artificial wetland, so the biochar has better strengthening effect on the denitrification and dephosphorization of the artificial wetland.
The following table is the average value of experimental data obtained by the sewage treatment detection of three groups of constructed wetlands in the HRT (high resolution transform) 3d operation stable stage:
the added biochar is obtained by carbonizing sludge waste generated by a secondary sedimentation tank of a sewage treatment plant, and is recycled to the sewage treatment, so that the effect of treating waste by waste is achieved, compared with the traditional wetland filler, the biochar has better phosphorus adsorption performance, and the adsorption effect of the filler matrix in the wetland on pollutants is improved. The method comprises the following specific steps:
sewage flows in from the bottom of the artificial wetland pool 1, when the sewage flows through the first zeolite layer 12, large-particle suspended matters in the sewage are filtered and intercepted, and the intercepted suspended matters are settled in the settling zone 11.
When sewage flows through the aerobic zone 131, water power is fully contacted with the aerobic microorganism filler 131a from bottom to top, the aerobic microorganisms perform nitrification under the aeration environment, part of organic matters are consumed, ammonia nitrogen in the sewage is converted into nitrate nitrogen, then when the sewage passes through the anaerobic zone, the anaerobic microorganisms perform denitrification by using COD (chemical oxygen demand) in the sewage as a carbon source, and the nitrate nitrogen generated in the aerobic zone is converted into N2And the denitrification effect of the artificial wetland is effectively improved by releasing.
Meanwhile, the phosphorus-releasing bacteria release a large amount of phosphorus in an anaerobic environment, then the phosphorus-releasing bacteria enter the second zeolite layer 14 for filtration, the filtered sewage enters the aerobic layer 15, the phosphorus released by the phosphorus-releasing bacteria in the anaerobic zone 132 is absorbed by the phosphorus-accumulating bacteria in the aerobic layer 15, then the sewage enters the mixed matrix layer 16, the phosphorus removal effect of the artificial wetland is better enhanced by utilizing the better adsorption effect of the sludge biochar on phosphate, and finally the sewage enters the soil layer 17, the sewage is further purified by utilizing a plant root system, and the purified sewage is discharged from a water outlet.
The solid suspended substances in the sewage, the aged microorganisms and extracellular polymeric substances thereof are settled in the settling zone 11 through the three-phase separator 3 and then discharged from the sludge discharge port 401.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a compound constructed wetland nitrogen and phosphorus removal system is reinforceed to charcoal, includes constructed wetland, and the cell body outside sets up the heat preservation, its characterized in that: the constructed wetland is provided with seven layers from bottom to top in proper order: the device comprises a precipitation zone, a first zeolite layer, an aerobic-anaerobic layer, a second zeolite layer, an aerobic layer, a mixed matrix layer and a soil layer;
a heating device is arranged between the precipitation zone and the first zeolite layer;
the aerobic-anaerobic layer is divided into three areas, namely an aerobic area, an anaerobic area and a water outlet area, by partition plates, and aerobic microbial fillers and anaerobic microbial fillers are respectively filled in the aerobic area and the anaerobic area;
and an aeration device is arranged at the bottom of the aerobic zone.
2. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: and water inlet pipelines are distributed in the settling zone, and a plurality of water outlet holes are uniformly formed at the lower ends of the water inlet pipelines.
3. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the upper portion still is provided with the three-phase separator in the settling zone, sets up the sewage collecting region of funnel type below the settling zone, sewage collecting region outer end sets up the outside mud discharge port of intercommunication constructed wetland.
4. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the heating device is composed of heating resistance wires and a temperature control device, the heating resistance wires are uniformly distributed between the precipitation zone and the first zeolite layer and are electrically connected with the temperature control device, and the temperature control device is powered by an external power supply.
5. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the first zeolite layer and the second zeolite layer are both filled with zeolite, wherein: the particle size of the zeolite of the first zeolite layer is 16-32mm, and the height of the first zeolite layer is 25-35 cm;
the second zeolite layer has a zeolite particle diameter of 8-16mm and a height of 20-30 cm.
6. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the aerobic microbial filler is a soft filler combined by a PE central rope and polyester yarns;
the anaerobic zone microbial filler is a porous plastic hollow ball filler and comprises a large porous hollow ball and a small porous hollow ball, the small hollow ball is arranged in the large hollow ball in a suspended manner and is wound and connected with the large hollow ball through elastic fibers, and a plurality of porous ceramsite are arranged in the small hollow ball.
7. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: a stainless steel wire mesh is arranged between the aerobic zone and the first zeolite layer, and the aperture of the stainless steel wire mesh is smaller than 3 mm;
partition boards are arranged between the anaerobic zone and the first zeolite layer and between the water outlet zone and the first zeolite layer, and the height of the aerobic-anaerobic layer is 35cm-40 cm.
8. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the aeration device comprises an aeration pipe and aeration heads, wherein the aeration heads are uniformly distributed on the aeration pipe, the aeration pipe penetrates through the wall of the artificial wetland and is connected with an air compressor, and the air compressor is powered by an external power supply.
9. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: the mixed matrix layer is prepared by mixing zeolite and sludge biochar according to the volume ratio of 1:1, and the particle size is 3-5 mm; a stainless steel wire mesh is arranged between the mixed matrix layer and the aerobic layer, and the height of the mixed matrix layer is 20-30 cm.
10. The biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system as claimed in claim 1, wherein the biochar-reinforced composite artificial wetland nitrogen and phosphorus removal system comprises: wetland plants are planted on the soil layer, a water outlet is formed in one side of the soil layer, and the water outlet penetrates through the upper end of the wall of the artificial wetland pool.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116282539A (en) * | 2023-03-13 | 2023-06-23 | 武汉东碧环保科技有限公司 | Vertical flow constructed wetland tank and combined rural domestic sewage treatment device |
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Address after: No. 3966, Qimen Road, Baohe District, Hefei City, Anhui Province, 230000 Applicant after: ANHUI TONGYUAN ENVIRONMENT ENERGY SAVING Co.,Ltd. Address before: 230000, no.856, Jinzhai South Road, Baohe District, Hefei City, Anhui Province Applicant before: ANHUI TONGYUAN ENVIRONMENT ENERGY SAVING Co.,Ltd. |