CN211999044U - Composite artificial wetland system for nitrogen and phosphorus removal - Google Patents
Composite artificial wetland system for nitrogen and phosphorus removal Download PDFInfo
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Abstract
The utility model relates to the technical field of sewage treatment, a composite constructed wetland system for nitrogen and phosphorus removal is disclosed, along the water flow direction, including the vertical current constructed wetland that communicates in order, horizontal undercurrent constructed wetland and surface runoff constructed wetland unit, vertical current constructed wetland has the anaerobism of horizontal undercurrent wetland and the aerobic characteristics of surface runoff wetland concurrently, and the regional oxygen nearer from the surface of water is sufficient, is favorable to nitrobacteria's nitrification, and along with the increase of degree of depth, dissolved oxygen reduces, and denitrogenation thiobacillus and pyrite take place the denitrification of nitrogen and the anaerobic degradation of organic matter under the oxygen deficiency environment, have realized the removal of aquatic pollution; in addition, iron ions can be combined with phosphate radicals to achieve the effect of removing phosphorus. The horizontal subsurface flow wetland is insufficient in oxygen supply and mainly carries out the denitrification process. In the surface runoff wetland, the plant root system transports oxygen to soil to form an aerobic zone, and the zone far away from the root system is a facultative anaerobic zone, and denitrification is carried out under the action of nitrifying and denitrifying bacteria.
Description
Technical Field
The utility model relates to a sewage treatment technical field, concretely relates to compound constructed wetland system for nitrogen and phosphorus removal.
Background
The artificial wetland is an artificial ecosystem which is artificially established and treats sewage by simulating a natural wetland system, mainly comprises a substrate, aquatic plants and microorganisms, and realizes the removal and decomposition of pollutants by utilizing the physical, chemical and biological synergistic effects of soil, the artificial substrate, the plants and the microorganisms. Compared with the traditional wastewater treatment process, the artificial wetland treatment process has the following advantages: the required structures and equipment are fewer, manual aeration and oxygen supply are not needed, the capital investment and the operating cost are lower, and generally only about 1/2-1/5 of conventional treatment is needed; the wetland treatment system is not provided with a secondary sedimentation tank, the sludge production of the system is less, and the like, and the artificial wetland is widely applied to the fields of domestic sewage treatment, lake and river treatment, advanced wastewater treatment and the like at present.
In the artificial wetland wastewater treatment system, the removal of nitrogen by the artificial wetland mainly comprises plant uptake, substrate adsorption and nitrification/denitrification of microorganisms, wherein the latter two actions are relatively obvious, but the nitrification of the microorganisms needs sufficient oxygen supply, and the oxygen in the artificial wetland mainly depends on plant transmission and atmospheric negative oxygen, so that the requirements of the microorganisms cannot be met in actual operation. In addition, the carbon-nitrogen ratio in domestic sewage is generally low, which easily causes the shortage of electron donors required in the denitrification process and influences the standard reaching of the total nitrogen of effluent. The phosphorus removal of the artificial wetland mainly comprises plant absorption and filler interception, but the artificial wetland can wither and even die plants in the winter operation process. Therefore, the enhancement of the denitrification and dephosphorization effect of the artificial wetland is a problem which needs to be solved urgently at present.
Therefore, the prior art discloses a composite vertical flow integrated system, which comprises a downward flow device and an upward flow device, wherein the bottoms of the downward flow device and the upward flow device are communicated with each other; the downward flow device comprises the following components from top to bottom in sequence: a soil layer, a ceramsite layer, a quartz sand layer and a pebble layer; the upward flow device sequentially comprises from top to bottom: soil layer, gravel layer, zeolite layer, pebble carbon-adding source layer. In the system, although the upflow device can provide an anoxic environment for microorganisms to generate denitrification and degrade organic matters, the upflow can increase the resistance of a water pump and increase the energy consumption of the system under the condition that the mass of the matrix filler is large, and simultaneously, the blockage is easy to occur, and the operation cost of the system is improved.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that current constructed wetland system has the energy consumption height and easily blocks up and thereby provide a low, difficult jam of energy consumption and the effectual compound constructed wetland system of nitrogen and phosphorus removal.
In order to solve the technical problem, the utility model provides a composite artificial wetland system for nitrogen and phosphorus removal, which comprises a first water inlet distribution area, a multi-stage combined artificial wetland treatment area and a third water outlet collection area which are connected in sequence; a first water inlet is arranged below the first water inlet distribution area, and a third water outlet is arranged below the third water outlet collection area; wherein the content of the first and second substances,
along the water flow direction, the multistage combined artificial wetland treatment area comprises a primary vertical flow artificial wetland unit, a secondary horizontal subsurface flow artificial wetland unit and a tertiary surface runoff artificial wetland unit which are sequentially communicated;
and a first water distribution pipeline for distributing water to the primary vertical flow artificial wetland unit is arranged above the primary vertical flow artificial wetland unit and is communicated with the first water inlet and distribution area.
Furthermore, the first water distribution pipeline comprises a water distribution main pipe communicated with the first water inlet and distribution area and a plurality of water distribution branch pipes arranged on the water distribution main pipe, and the water distribution branch pipes are provided with a plurality of water distribution holes and used for distributing water to the first-stage vertical flow artificial wetland unit.
Furthermore, the main water distribution pipe is movably arranged in two opposite side walls of the primary vertical flow artificial wetland unit.
Further, the packing layer of the first-level vertical flow constructed wetland unit sequentially comprises from top to bottom: the high-temperature-resistant and high-temperature-resistant composite material comprises a first volcanic rock layer, a first limestone layer, a first pyrite layer and a first cobble layer, wherein the height ratio of the first volcanic rock layer to the first limestone layer to the first pyrite layer to the first cobble layer is (3-12): 3: (3-12): 3;
the packing layer of the second-level horizontal subsurface flow constructed wetland unit sequentially comprises from top to bottom: the height ratio of the second volcanic rock stratum, the second limestone stratum, the second pyrite layer and the second cobble layer is 1: 1: 1: 1;
the packing layer of the three-level surface runoff constructed wetland unit sequentially comprises from top to bottom: the soil layer and the cobblestone layer, aquatic plant plants on the surface of soil layer.
Furthermore, the particle size of the volcanic rocks of the first volcanic rock layer and the second volcanic rock layer is 10-15 mm; the particle size of the limestone of the first limestone layer and the second limestone layer is 5-10 mm; the particle size of the pyrite in the first pyrite layer and the second pyrite layer is 3-5 mm; the aquatic plant is iris citrifolia, and the planting density is 40-50 granules/square meter.
Furthermore, the sewage treated by the primary vertical flow artificial wetland unit enters a first water outlet collecting area from a first water outlet channel, enters a second water inlet distributing area through a second water distributing pipeline above the first water outlet collecting area, and enters the secondary horizontal subsurface flow artificial wetland unit through an overflow plate above the second water inlet distributing area; the sewage treated by the secondary horizontal subsurface flow constructed wetland unit enters a second water outlet collecting area from a second water outlet channel, enters a third water inlet distributing area through a third water distributing pipeline above the second water outlet collecting area, and enters the tertiary surface runoff constructed wetland unit through an overflow plate above the third water inlet distributing area; and sewage treated by the three-stage surface runoff constructed wetland unit enters the third effluent collecting area from the third effluent channel and is discharged by the third water outlet after reaching the standard.
Furthermore, the first water outlet channel, the second water outlet channel and the third water outlet channel are respectively arranged at the lower positions of the water outlet sides of the corresponding artificial wetland units, and the heights of the first water outlet channel, the second water outlet channel and the third water outlet channel are not higher than the heights of the pebble layers in the corresponding artificial wetland units.
Furthermore, the first water outlet channel, the second water outlet channel and the third water outlet channel are water permeable plates respectively arranged at the water outlet sides of the corresponding constructed wetland units, and the water permeable plates are provided with a plurality of water permeable holes.
Furthermore, sulfur particles with the particle size of 3-5 mm are paved in the first water inlet distribution area and the second water inlet distribution area.
Furthermore, drain holes are formed below the first water outlet collecting area, the second water inlet distributing area, the second water outlet collecting area and the third water inlet distributing area.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a compound constructed wetland system for nitrogen and phosphorus removal, along the rivers direction, including the one-level vertical current constructed wetland unit, second grade horizontal undercurrent constructed wetland unit and the tertiary surface runoff constructed wetland unit that communicate in order, vertical current constructed wetland has the anaerobism of horizontal undercurrent wetland and the good oxygen characteristics of surface runoff wetland concurrently, and is sufficient in the regional oxygen that is nearer from the surface of water, is favorable to nitrobacteria's nitrification, and the partial micromolecule pollutant of fast degradation, along with the increase of degree of depth, dissolved oxygen reduces, and denitrogenation thiobacillus and pyrite take place nitrogen and the anaerobic degradation of organic matter under the oxygen deficiency environment, have realized the removal of aquatic pollution, especially the removal of nitrogen; in addition, iron ions can be combined with phosphate radicals to achieve the effect of removing phosphorus. The horizontal subsurface flow wetland is insufficient in oxygen supply, mainly performs a denitrification process, and the cooperation of pyrite and sulfur provides a sulfur source for microorganisms, and limestone provides a part of carbon source and balances the pH value of effluent. In the surface runoff wetland, the plant root system transports oxygen to the soil, so that an aerobic zone is formed on the surface of the root system, and an area far away from the root system is a facultative anaerobic zone, and denitrification is performed under the combined action of nitrifying and denitrifying bacteria. The utility model discloses a compound constructed wetland system comprises multistage combination constructed wetland unit, through the multiprocessing technology, through physics-chemistry-biological combined action, high-efficient nitrogen and phosphorus removal can make the discharge to reach standard of effluent.
2. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal, the top of one-level vertical flow constructed wetland sets up the distribution pipeline, and the running mode of downflow has greatly reduced the resistance of rivers and the emergence of jam phenomenon in the constructed wetland, has effectively reduced the energy consumption of constructed wetland, has reduced the running cost; the water distribution pipeline comprises a main water distribution pipe and a branch water distribution pipe, and the branch water distribution pipe is provided with a plurality of water distribution holes, so that water distribution is more uniform, and removal of pollutants in water by the artificial wetland is improved.
3. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal, the water distribution is responsible for movable formula and is set up at relative both sides internally, and is rotatory the water distribution is responsible for the play water end that can make the water distribution branch pipe and is higher than its end of intaking, and the afterbody of water distribution branch pipe perks upwards promptly, and when water process water distribution branch pipe, rivers are the blowout of jet form, through spraying the water distribution, have improved one-level vertical flow constructed wetland's dissolved oxygen, are favorable to nitrobacteria to turn into nitrate nitrogen through the ammonia nitrogen of nitration with the aquatic, realize getting rid of the aquatic nitrogen.
4. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal plants aquatic plant in the soil horizon of tertiary surface runoff constructed wetland unit, utilizes the plant action to provide the required oxygen of corresponding wetland on the one hand, and on the other hand aquatic plant can also utilize the effect part of self to realize getting rid of aquatic pollutant, further improves compound vertical current constructed wetland is to the treatment effect of sewage.
5. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal sets up into water distribution area, goes out the water end and sets up out the water catchment area at the end of intaking of constructed wetland units at different levels respectively to and set up out water channel in a water side below position, improved the homogeneity of water distribution, be favorable to the getting rid of constructed wetland to aquatic pollutant.
6. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal through setting up the overflow plate, makes the direction of rivers go right from a left side and gets into next-level constructed wetland unit on the one hand, and on the other hand, it still can intercept the floc of production such as pyrite, lime stone, effectively avoids next-level constructed wetland's filler jam problem.
7. The utility model provides a compound constructed wetland system for nitrogen and phosphorus removal, lay sulphur in the water supply district of intaking, and lay the volcanic rock of specific proportion at vertical current constructed wetland and horizontal undercurrent constructed wetland unit, lime stone and pyrite, sulphur and pyrite not only provide the sulfur source for the microorganism, and can form chain reaction between the negative valence state sulphide ion that forms between the two and the sulphur, the speed that the electron donor provided the electron has effectively been improved, the hydrogen ion that produces when making the microorganism utilize sulphur to carry out denitrification denitrogenation changes and reacts with pyrite, the dissolution of pyrite has been promoted, generate the polysulfide that is easily utilized by the microorganism simultaneously, autotrophic denitrification speed has been improved by a wide margin, exert the synergistic action of sulphur autotrophic denitrification and pyrite autotrophic denitrification to a great extent; the limestone can provide an inorganic carbon source, and after the limestone is contacted with the sewage, iron ions or ferrous ions released by calcium ions and pyrite can also react with phosphorus in the sewage to generate insoluble substances of ferric sulfate and sulfur calcium sulfate, so that phosphorus is removed; the volcanic rock has large specific surface area and abundant pore structures, is favorable for biofilm formation of microorganisms, and provides favorable environment for the survival of the microorganisms.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a composite constructed wetland system for nitrogen and phosphorus removal in embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a first water distribution pipeline in embodiment 1 of the present invention;
fig. 3 is a schematic structural view of the permeable plate in embodiment 1 of the present invention.
Description of reference numerals:
1-a first water inlet and distribution area; 2-a third effluent collecting area; 3-a first water inlet; 4-a third water outlet; 5-a first-stage vertical flow artificial wetland unit; 6-a second-level horizontal subsurface flow constructed wetland unit; 7-three-stage surface runoff constructed wetland unit; 8-a first water distribution pipeline; 81-water distribution main pipe; 82-water distribution branch pipes; 83-water distribution holes; 9-a first water outlet channel; 10-a first effluent collecting area; 11-a second water distribution pipeline; 12-a second water intake and distribution area; 13-a second water outlet channel; 14-a second effluent collecting area; 15-a third water distribution pipeline; 16-a third water inlet and distribution area; 17-a first overflow plate; 18-a second overflow plate; 19-a third water outlet channel; 20-drainage holes.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Examples
The embodiment provides a composite artificial wetland system for nitrogen and phosphorus removal, which comprises a first water inlet and distribution area 1, a first-stage vertical flow artificial wetland unit 5, a second-stage horizontal subsurface flow artificial wetland unit 6, a third-stage surface runoff artificial wetland unit 7 and a third water outlet and collection area (2) which are sequentially connected, wherein the first-stage vertical flow artificial wetland unit 5, the second-stage horizontal subsurface flow artificial wetland unit 6, the third-stage surface runoff artificial wetland unit 7 and the third water outlet and collection area are sequentially communicated; a first water inlet 3 is arranged below the first water inlet distribution area 1, a third water outlet 4 is arranged below the third water outlet collection area (2), sewage enters the first water inlet distribution area 1 from the first water inlet 3, water is distributed to the first-stage vertical flow artificial wetland unit through a first water distribution pipeline 8 arranged above the first-stage vertical flow artificial wetland unit 5, the sewage treated by the first-stage vertical flow artificial wetland unit 5 enters the first water outlet collection area 10 through a first water outlet channel 9, enters the second water inlet distribution area 12 through a second water distribution pipeline 11 above the first water outlet collection area 10, and enters the second-stage horizontal subsurface flow artificial wetland unit 6 through a first overflow plate 17 above the second water inlet distribution area (12); the sewage treated by the secondary horizontal subsurface flow constructed wetland unit 6 enters a second outlet water collecting area 14 from a second outlet water channel 13, enters a third inlet water distributing area 16 through a third water distributing pipeline 15 above the second outlet water collecting area 14, and enters a tertiary surface runoff constructed wetland unit 7 through a second overflow plate 18 above the third inlet water distributing area 16; the sewage treated by the third-stage surface runoff constructed wetland unit 7 enters the third effluent collecting area 2 through the third effluent channel 19 and is discharged by the third water outlet 4 after reaching the standard.
In this embodiment, as shown in fig. 2, the first water distribution pipe 8 includes a main water distribution pipe 81 communicating with the first water inlet and distribution region 1, and a plurality of branch water distribution pipes 82 disposed on the main water distribution pipe 81, the branch water distribution pipes 82 are provided with a plurality of water distribution holes 83 for distributing water to the first-stage vertical flow artificial wetland unit 5, and the water distribution pipes are provided with a plurality of water distribution holes, so that water distribution is more uniform. The water distribution main pipe 81 is inserted into the wall bodies on two opposite sides of the primary vertical flow constructed wetland unit 5 in an inserting mode and the like, the water distribution main pipe 81 is rotated, so that the water outlet end of the water distribution branch pipe is higher than the water inlet end of the water distribution branch pipe, namely the tail part of the water distribution branch pipe is tilted upwards, when water passes through the water distribution branch pipe, water flow is sprayed in a spraying mode, and water distribution is carried out through spraying, so that dissolved oxygen of the primary vertical flow constructed wetland can be improved, and nitrifying bacteria can convert ammonia nitrogen in the water into nitrate nitrogen through nitrification.
In this embodiment, as shown in fig. 1, the first water outlet channel 9, the second water outlet channel 13 and the third water outlet channel 19 are respectively disposed at the lower end of the water outlet side of the corresponding constructed wetland unit, and the height of the first water outlet channel, the second water outlet channel and the third water outlet channel is generally not higher than the height of the pebble supporting layer in the corresponding wetland unit, so as to ensure that the sewage is discharged after being fully contacted with each layer of filler in each stage of constructed wetland unit from top to bottom. In addition, in order to avoid too fast water outlet speed, the water outlet channel is generally implemented by installing a water permeable plate on the water outlet side wall of the constructed wetland, and as shown in fig. 3, a plurality of water permeable holes are formed in the water permeable plate.
In this embodiment, as shown in fig. 1, the packing layers of the primary vertical flow constructed wetland unit 5 are, from top to bottom: the high-temperature-resistant and high-temperature-resistant composite material comprises a first volcanic rock layer, a first limestone layer, a first pyrite layer and a first cobble layer, wherein the height ratio of the first volcanic rock layer to the first limestone layer to the first pyrite layer to the first cobble layer is (3-12): 3: (3-12): 3, the packing layer of the second-level horizontal subsurface flow constructed wetland unit 6 sequentially comprises from top to bottom: the height ratio of the second volcanic rock stratum, the second limestone stratum, the second pyrite layer and the second cobble layer is 1: 1: 1: 1, wherein the particle sizes of the volcanic rock particles, the limestone particles and the pyrite particles are respectively as follows: 10-15 mm, 5-10 mm and 3-5 mm, the purity is more than 80%, and the specific proportion of each layer of filler, the particle size of the filler and the like can be specifically determined according to the contents of nitrogen and phosphorus in sewage, the flow velocity of the sewage and other factors. The packing layer of the three-level surface runoff constructed wetland unit 7 is sequentially provided with a soil layer and a cobble layer from top to bottom, aquatic plants are planted on the surface of the soil layer, factors such as stress resistance, root thickness, growth period, capability of growing in a humid environment, landscape effect and the like of the plants are comprehensively considered, the aquatic plants can be irises daylily, and the planting density is generally 40-50 per square meter.
In the embodiment, in order to enhance the denitrification and dephosphorization effect, sulfur particles with the particle size of 3-5 mm are paved in the first water inlet distribution area 1 and the second water inlet distribution area 12, as shown in fig. 1, in the embodiment, the height of the sulfur layer is the same as that of the packing layer of the corresponding constructed wetland unit. The sulfur and the pyrite not only provide a sulfur source for the microorganisms, but also can form a chain reaction between negative valence state sulfide ions formed between the sulfur and the sulfur, so that the rate of providing electrons by an electron donor is effectively improved, hydrogen ions generated when the microorganisms utilize the sulfur to perform denitrification can react with the pyrite more easily, the dissolution of the pyrite is promoted, polysulfide which can be easily utilized by the microorganisms is generated, the autotrophic denitrification rate is greatly improved, and the synergistic effect of the sulfur autotrophic denitrification and the pyrite autotrophic denitrification is exerted to a great extent.
In order to facilitate the periodic cleaning of the composite artificial wetland system, in this embodiment, drain holes are formed below the first effluent collecting area 10, the second influent water distribution area 12, the second effluent collecting area 14 and the third influent water distribution area 16.
The composite artificial wetland system is applied to the treatment of domestic sewage in a certain village, and the designed inflow rate is 20m3And d, the sewage quality is as follows: and SS: 20-40 mg/L, COD: 100 to 200mg/L, NH3-N: 15-50 mg/L, TN: 25-50 mg/L, TP: 3-5 mg/L. After long-time continuous operation, the whole system operates normally without any blockage phenomenon or the condition of needing emptying. And (3) detecting the water quality when the effluent quality is stable, wherein the SS: 2-6 mg/L, COD: 20 to 35mg/L, NH3-N: 0.5-2 mg/L, TN: 0.5-2 mg/L, TP: 0.1-0.5 mg/L, which reaches the IV-class water standard on the earth surface.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (8)
1. A composite artificial wetland system for nitrogen and phosphorus removal comprises a first water inlet distribution area (1), a multi-stage combined artificial wetland treatment area and a third water outlet collection area (2) which are connected in sequence; a first water inlet (3) is arranged below the first water inlet distribution area (1), and a third water outlet (4) is arranged below the third water outlet collection area (2); it is characterized in that the preparation method is characterized in that,
along the water flow direction, the multi-stage combined artificial wetland treatment area comprises a primary vertical flow artificial wetland unit (5), a secondary horizontal subsurface flow artificial wetland unit (6) and a tertiary surface runoff artificial wetland unit (7) which are sequentially communicated;
a first water distribution pipeline (8) for distributing water to the primary vertical flow artificial wetland unit (5) is arranged above the primary vertical flow artificial wetland unit (5), and the first water distribution pipeline (8) is communicated with the first water inlet and distribution area (1);
the packing layer of the first-level vertical flow artificial wetland unit (5) sequentially comprises from top to bottom: the system comprises a first volcanic rock layer, a first limestone layer, a first pyrite layer and a first cobble layer;
the packing layer of the second-level horizontal subsurface flow constructed wetland unit (6) sequentially comprises from top to bottom: the second volcanic rock stratum, the second limestone stratum, the second pyrite stratum and the second cobble stratum;
the packing layer of the three-level surface runoff constructed wetland unit (7) sequentially comprises from top to bottom: the soil layer and the cobblestone layer, and aquatic plants are planted on the surface of the soil layer;
the sewage treated by the primary vertical flow artificial wetland unit (5) enters a first water outlet collecting area (10) from a first water outlet channel (9), enters a second water inlet distributing area (12) from a second water distributing pipeline (11) above the first water outlet collecting area (10), and enters the secondary horizontal subsurface flow artificial wetland unit (6) from a first overflow plate (17) above the second water inlet distributing area (12); the sewage treated by the secondary horizontal subsurface flow constructed wetland unit (6) enters a second outlet water collecting area (14) from a second outlet water channel (13), enters a third inlet water distribution area (16) through a third water distribution pipeline (15) above the second outlet water collecting area (14), and enters the tertiary surface runoff constructed wetland unit (7) through a second overflow plate (18) above the third inlet water distribution area (16); the sewage treated by the three-level surface runoff artificial wetland unit (7) enters the third effluent water collecting area (2) through a third effluent channel (19) and is discharged by a third water outlet (4) after reaching the standard;
the first water outlet channel (9), the second water outlet channel (13) and the third water outlet channel (19) are respectively arranged at the lower positions of the water outlet sides of the corresponding artificial wetland units, and the heights of the first water outlet channel, the second water outlet channel and the third water outlet channel are not higher than the heights of the pebble layers in the corresponding artificial wetland units.
2. The composite constructed wetland system according to claim 1, wherein the first water distribution pipeline (8) comprises a water distribution main pipe (81) communicated with the first water inlet and distribution area (1) and a plurality of water distribution branch pipes (82) arranged on the water distribution main pipe (81), and a plurality of water distribution holes (83) are arranged on the water distribution branch pipes (82) and used for distributing water to the primary vertical flow constructed wetland unit (5).
3. The composite constructed wetland system of claim 2, wherein the water distribution main pipes (81) are movably arranged in the two opposite side walls of the primary vertical flow constructed wetland unit (5).
4. The composite constructed wetland system of claim 1, wherein the height ratio of the first volcanic rock layer, the first limestone layer, the first pyrite layer and the first cobble layer is (3-12): 3: (3-12): 3;
the height ratio of the second volcanic rock layer, the second limestone layer, the second pyrite layer and the second cobble layer is 1: 1: 1: 1.
5. the composite constructed wetland system of claim 3, wherein the volcanic rocks of the first and second volcanic rock layers have a particle size of 10-15 mm; the particle size of the limestone of the first limestone layer and the second limestone layer is 5-10 mm; the particle size of the pyrite in the first pyrite layer and the second pyrite layer is 3-5 mm; the aquatic plant is iris citrifolia, and the planting density is 40-50 granules/square meter.
6. The combined artificial wetland system according to claim 1, wherein the first water outlet channel (9), the second water outlet channel (13) and the third water outlet channel (19) are water permeable plates respectively arranged at the water outlet sides of the corresponding artificial wetland units, and the water permeable plates are provided with a plurality of water permeable holes.
7. The composite constructed wetland system according to any one of claims 1 to 6, wherein sulfur particles with a particle size of 3 to 5mm are paved in the first water inlet distribution area (1) and the second water inlet distribution area (12).
8. The compound constructed wetland system according to claim 1, characterized in that drain holes (20) are arranged below the first effluent collecting area (10), the second influent water distribution area (12), the second effluent collecting area (14) and the third influent water distribution area (16).
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112624345A (en) * | 2020-12-03 | 2021-04-09 | 江苏省环境工程技术有限公司 | Artificial wetland sewage treatment method |
| CN113023838A (en) * | 2021-04-01 | 2021-06-25 | 浙江大学衢州研究院 | Device and method for enhancing deep nitrogen and phosphorus removal of constructed wetland by electrochemical coupling of pyrite |
| CN113087300A (en) * | 2021-04-07 | 2021-07-09 | 苏州科技大学 | High-efficiency nitrogen and phosphorus removal composite artificial wetland system |
| CN113321369A (en) * | 2021-02-08 | 2021-08-31 | 重庆大学 | Tidal flow artificial wetland capable of simultaneously removing nitrogen and phosphorus |
| CN114349181A (en) * | 2022-01-05 | 2022-04-15 | 郑州轻工业大学 | Non-energy-consumption oxygenation constructed wetland system, operation method and application |
| CN114620832A (en) * | 2022-04-15 | 2022-06-14 | 合肥工业大学 | Sulfur-based autotrophic microbial denitrification material and preparation and application methods thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112624345A (en) * | 2020-12-03 | 2021-04-09 | 江苏省环境工程技术有限公司 | Artificial wetland sewage treatment method |
| CN113321369A (en) * | 2021-02-08 | 2021-08-31 | 重庆大学 | Tidal flow artificial wetland capable of simultaneously removing nitrogen and phosphorus |
| CN113023838A (en) * | 2021-04-01 | 2021-06-25 | 浙江大学衢州研究院 | Device and method for enhancing deep nitrogen and phosphorus removal of constructed wetland by electrochemical coupling of pyrite |
| CN113087300A (en) * | 2021-04-07 | 2021-07-09 | 苏州科技大学 | High-efficiency nitrogen and phosphorus removal composite artificial wetland system |
| CN114349181A (en) * | 2022-01-05 | 2022-04-15 | 郑州轻工业大学 | Non-energy-consumption oxygenation constructed wetland system, operation method and application |
| CN114620832A (en) * | 2022-04-15 | 2022-06-14 | 合肥工业大学 | Sulfur-based autotrophic microbial denitrification material and preparation and application methods thereof |
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