CN107055783B - Composite flow constructed wetland system for strengthening treatment of eutrophic water body - Google Patents

Composite flow constructed wetland system for strengthening treatment of eutrophic water body Download PDF

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CN107055783B
CN107055783B CN201710233564.3A CN201710233564A CN107055783B CN 107055783 B CN107055783 B CN 107055783B CN 201710233564 A CN201710233564 A CN 201710233564A CN 107055783 B CN107055783 B CN 107055783B
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layer
water
overflow
water distribution
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CN107055783A (en
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李瑞兴
邢磊
黄君
樊彤
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Beijing State Owned Financial Leasing Co ltd
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BEIJING ZEHO WATERFRONT ECOLOGICAL ENVIRONMENT TREATMENT CORP
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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
    • C02F3/30—Aerobic and anaerobic processes
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Biodiversity & Conservation Biology (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

The invention provides a composite flow constructed wetland system for strengthening treatment of eutrophic water, wherein the bottom surface of a tank body is a longitudinal inclined surface with a high front part and a low rear part, the tank body is sequentially divided into a first unit, a second unit and a third unit along the water flow direction, the bottom of each unit is provided with a water distribution layer, the rear end of each unit is provided with an overflow weir, the overflow water of the former unit is connected to the water distribution layer of the latter unit, the main packing layers of the first unit and the third unit respectively adopt volcanic rock and gravel/fly ash, the main packing layer of the second unit adopts a straw layer and/or a humus layer, reeds are planted in the first unit and the third unit, and cattail is planted in the second unit. The invention has strong capability of removing nitrogen and phosphorus and is not easy to block.

Description

Composite flow constructed wetland system for strengthening treatment of eutrophic water body
Technical Field
The invention relates to a composite flow constructed wetland system for strengthening treatment of eutrophic water, belonging to the technical field of environmental protection.
Background
In recent years, due to the development of economy and the improvement of the living standard of residents, a large amount of sewage which is not properly treated is discharged into water bodies such as rivers, lakes and the like, so that the phenomenon of river eutrophication in China is becoming more and more serious. The eutrophic water body generally has the characteristics of low carbon-nitrogen ratio (generally less than 3) and low phosphorus concentration (generally less than 1 mg/L), and nitrogen mainly exists in the form of nitrate nitrogen, which brings difficulty to nitrogen and phosphorus removal of the water body.
The artificial wetland sewage treatment technology is widely applied to the field of sewage treatment because of low construction and operation cost, convenient maintenance and management and stable treatment effect. The traditional artificial wetland with horizontal subsurface flow, vertical subsurface flow and composite flow has certain functions of nitrogen and phosphorus removal of eutrophic water body, but still has a plurality of defects. Such as: because the eutrophic water body has relatively low organic matter content, the denitrification capability of the traditional artificial wetland is severely limited; the low concentration of phosphorus makes phosphorus removal difficult.
Therefore, with the increasing requirements of the country on the water environment and the intensive research on the artificial wetland sewage treatment technology, the development of a novel multistage combined flow artificial wetland system for strengthening nitrogen and phosphorus removal is performed under the condition of high treatment difficulty of low carbon nitrogen ratio and low concentration phosphorus in the eutrophic water body, and the development of the novel multistage combined flow artificial wetland system becomes a necessary way for deep nitrogen and phosphorus removal of the eutrophic water body.
In addition, the bottom surfaces of the existing artificial wetlands are designed into horizontal surfaces, so that the problem of blockage is easy to occur, which is an important factor for shortening the service life of the artificial wetlands.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the composite flow constructed wetland system for strengthening the treatment of the eutrophic water body, and the system has strong capability of removing nitrogen and phosphorus and is not easy to block.
The technical scheme of the invention is as follows:
a composite flow constructed wetland system for strengthening treatment of eutrophic water comprises a pool body, wherein the pool body is sequentially divided into a first unit, a second unit and a third unit along the water flow direction, the bottom of each unit is provided with a water distribution layer, the rear end of each unit is provided with an overflow weir, the water outlet of the overflow weir of the first unit and the overflow weir of the second unit are respectively connected into the water distribution layers of the second unit and the third unit, the system inlet is connected into the water distribution layer of the first unit, the overflow outlet of the third unit is connected into a water outlet tank positioned behind the third unit, the water outlet tank is provided with a system outlet pipe, the water distribution layers are filled with particle fillers, gaps forming water distribution channels are reserved among the particle fillers of the water distribution layers, a main filler layer is arranged on the water distribution layer of each unit, a surface layer is arranged on each main filler layer, the main particles of the main units and the third unit of the first unit are respectively provided with an inorganic particle layer, the main filler layer of the second unit comprises an organic filter material layer and an inorganic particle layer positioned on the organic filter material layer.
The organic filter material layer can be composed of a mixture of straw broken sections and humus soil, and also can be composed of straw broken sections and humus soil layers which are distributed at intervals from top to bottom, at least the straw broken sections or the humus soil layers are multilayer, and the straw broken sections or the humus soil layers are preferably multilayer. The mass ratio of the straw fragments to the humus soil in the organic filter material layer is preferably 10:4-5, and the straw fragments are preferably reed straw fragments with the length of 30-80 mm.
The surface layer of each unit can adopt a fine sand layer.
The inorganic particle layer of the first unit and the inorganic particle layer of the second unit may each employ a volcanic rock particle layer.
The inorganic particle layer of the third unit may adopt a mixture layer of gravel and fly ash, the mass ratio of the gravel to the fly ash is preferably 10:8-12, and the particle size of the gravel is preferably 30-50 mm.
Preferably, reeds are planted in the first unit and the third unit, and cattail is planted in the second unit.
Preferably, the bottom surface of the tank body is a longitudinal inclined surface with a high front part and a low back part.
The bottom of each unit may be provided with a longitudinally extending central protrusion, which is preferably located at the central portion in the left-right direction, and the cross section of which may be triangular or triangle-like in the middle.
And the upper parts of the side walls of the first unit and the second unit can be provided with lateral overflow pipes, the overflow pipes are positioned at the longitudinal rear parts of the units, and the overflow heights of the lateral overflow pipes are higher than those of overflow weirs of the units.
Lateral emptying pipes can be arranged at the bottoms of the side walls of the units and are positioned at the longitudinal rear parts of the units, the emptying pipes penetrate through the side walls of the units, the inner ends of the emptying pipes are positioned on the water distribution layer of the units, the outer ends of the emptying pipes extend out of the side walls of the units or form water outlets on the side walls of the units, and emptying control valves can be arranged on the lateral emptying pipes.
The bottom of first unit is preferred to be equipped with the perforation floral tube of longitudinal extension, the front end of perforation floral tube passes through pipe connection washing water pump, and the rear end port is sealed, washing water pump can install the subaerial in first unit the place ahead, washing water source, for example washing water inlet pipe or washing basin can be connected to washing water pump's the section of intaking, can adopt the water after this system handles as washing water source, for example, will wash water pump's the end of intaking and insert play basin.
The water inlet of the system is connected into the water distribution layer of the first unit in a mode that: the tail end of the system water inlet pipe is connected with the front end of the water distribution layer of the first unit through a first water guide gallery at the front end of the first unit, and the water outlet of the overflow weirs of the first unit and the second unit is respectively connected into the water distribution layers of the second unit and the third unit in a mode that: the overflow outlet water of the first unit is connected with the front end of the water distribution layer of the second unit through a second water guide gallery positioned at the front end of the second unit, and the overflow outlet water of the second unit is connected with the front end of the water distribution layer of the third unit through a third water guide gallery positioned at the front end of the third unit.
Each water guiding corridor is preferably as follows: the first water guide gallery by the front end inner wall of cell body with the clearance that stays between the front end plate of first unit constitutes, the second water guide gallery by three water guide galleries by the clearance that stays between the rear end plate of second unit and the front end plate of third unit constitutes, the top of the rear end plate of each unit constitutes the overflow weir of this unit, the bottom surface of cell body is connected to the bottom, the base of the front end plate of each unit with leave the clearance that constitutes the rivers passageway between the bottom surface of cell body. The top of the front end plate of the first unit is higher than the height of the system water inlet pipe, and the top of the front end plate of the second unit and the top of the front end plate of the third unit are respectively higher than the height of the overflow weir of the first unit and the height of the overflow weir of the second unit.
The overflow weir of each unit can adopt a triangular weir structure. .
The invention has the beneficial effects that:
the carbon-nitrogen ratio is improved, and the denitrification effect of the constructed wetland system is enhanced;
the phosphorus removal effect of the artificial wetland is enhanced by selecting the efficient phosphorus removal filler;
the water flow is upward flow, so that the possibility of short circuit of the water flow is reduced, and solid suspended matters contained in the inlet water are deposited on the bottom layer, so that the blocking risk is reduced;
compared with the traditional vertical subsurface flow constructed wetland, the scheme does not need a water distribution pipeline, saves the manufacturing cost, has a certain gradient at the bottom of each treatment unit, and is favorable for removing bottom sediments when being discharged;
the system is in a saturated state for a long time, so that the anoxic environment is favorably kept, and the denitrification is favorably realized;
according to different plant characteristics, reeds are planted in the first processing unit, and the characteristic of strong oxygen secretion capability of a reed root system is fully utilized;
the second treatment unit is mainly a denitrification area and is used for planting typha with limited oxygen secretion capacity, so that the influence on denitrification is avoided or reduced;
a certain amount of humus soil is adulterated in the second treatment unit, and the humus soil contains a large number of microorganisms, so that the system starting time is shortened;
the third treatment unit is made of crushed stone and fly ash, and the phosphorus removal effect is enhanced on the premise of ensuring normal water flow.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of the present invention;
FIG. 2 is a schematic top perspective view of the present invention;
fig. 3 is a schematic cross-sectional view of the present invention.
Detailed Description
Referring to fig. 1-3, the invention aims to improve the carbon-nitrogen ratio, enlarge the anoxic zone of the system and strengthen the removal effect of the constructed wetland on nitrogen and phosphorus by optimizing the structure, the water flow direction and the filler configuration of the constructed wetland.
The wetland treatment method comprises the steps that a tank body forming the wetland is divided into three treatment units by partition plates, namely a first unit, a second unit and a third unit are sequentially arranged along the water flow direction, the optimized volume ratio of each unit is 1:2:1, the tank body is a cuboid overall, the bottom surface has a certain gradient of about 1%, and the elevation of the surface layer of filler of each unit is sequentially reduced by 5-10cm along the water flow direction. The bottom of each unit is provided with a triangular bulge 20 capable of forming a certain transverse gradient, the angle is 10-20 degrees, hollow pipes 14 are uniformly arranged on two sides of the lower end (rear end) of the bottom of each unit and also used as mud discharge pipes, a gravel layer with the thickness of 20-30cm is filled at the bottom to be used as a water distribution layer 3, and the particle size is about 30-50 mm.
The back parts of the first unit and the second unit are provided with overflow pipes 16, the main packing layer 4 of the first unit adopts volcanic rock packing with the thickness of about 60-80cm and the grain diameter of 8-16mm, the surface layer 5 is a fine sand layer with the thickness of about 15cm and the grain diameter of about 0-4mm, and reeds 6 are planted on the fine sand layer with the planting density of 20 plants/m2。
Need to handle the water and flow through first unit at first, the solid suspended solid is the most at first unit bottom accumulation, lead to the system jam most easily, consequently, arrange the PVC perforation floral tube 19 that the pipe diameter is 3cm in first unit bottom, peripheral trompil, the aperture is about 3mm, the perforation floral tube links to each other with washing water pump 18 through the standpipe of the same pipe diameter, when first unit anterior diversion canal water level obviously risees, open washing water pump 18, wash the unit bottom, and open unit bottom blow-down pipe simultaneously, get rid of the solid suspended solid of accumulation.
The organic packing layer 7 of the second unit adopts reed straws or humus, preferably alternately adopts straws and humus, the packing thickness is about 50cm, the reed is naturally air-dried in advance and is cut into pieces with the length of about 5cm, the humus contains a large number of microorganisms including nitrobacteria, denitrifying bacteria and the like, the time for the system to achieve stable and efficient treatment can be shortened, in addition, at the initial operation stage of the system, organic matters contained in the humus can be utilized by the denitrifying bacteria to enhance the denitrifying denitrification effect, the volcanic rock layer 17 is arranged on the organic packing layer 7, the thickness is about 20cm, the particle size is about 8-16mm, the surface layer 8 is fine sand covering 15cm in thickness, typha 9 is planted, and the planting density is 20 plants/m2。
Gravel or fly ash is adopted as the main packing layer 10 of the third unit, or gravel and fly ash are alternately adopted in layers, the packing thickness is 60-80cm, the particle size of the gravel is about 2cm, when two kinds of packing are alternately adopted, the volume ratio of the gravel to the fly ash is about 1:1, the surface layer 11 is a fine sand layer with the thickness of 15cm, and reed 6 is planted, the planting density is 20 plants/m2。
Eutrophic water body enters the system from the water inlet pipe 1, enters the bottom of the first unit through the diversion gallery 2, flows through the gravel layer 3, the volcanic rock layer 4 and the fine sand layer 5, enters the second unit through the overflow triangular weir 15, the volcanic rock has higher specific surface area and higher biomass, and the reeds have stronger oxygen secretion capacity, and the combination of the two strengthens the ammonia nitrogen removal capacity of the unit.
Due to the adsorption effect of the volcanic rock on the phosphorus, the phosphorus content in the water body is reduced to a certain extent, ammonia nitrogen is effectively removed after the water body flows through the first unit, and the phosphorus content is reduced to a certain extent. The nitrification of ammonia nitrogen and the degradation of organic matters in the first unit consume a certain amount of dissolved oxygen, so that the dissolved oxygen of the eutrophic water body entering the system is reduced to a certain extent, and a favorable anoxic environment is formed for the denitrification of the second unit.
The water body flows upwards from the bottom of the second unit and sequentially flows through the reed stem layer 7, the volcanic rock layer 17 and the fine sand layer 8, and cellulose or hemicellulose in the reed stems is decomposed under the action of microorganisms to provide a carbon source for denitrifying bacteria in the system and serve as an electron acceptor for denitrification; the reed rod is a hollow structure, which is beneficial to the attachment growth of microorganisms such as denitrifying bacteria. The huge specific surface area of the root system of the cattail 9 planted on the surface layer can also provide an attachment place for plants, and organic matters such as organic acid secreted by the root system of the cattail can provide a certain carbon source for denitrifying bacteria. After the water flows through the second unit, the total nitrogen is effectively removed.
The water body flows upwards from the bottom of the third unit through the gravel layer/pulverized coal ash layer 10, and because the pulverized coal ash has strong phosphorus adsorption capacity, phosphorus in the water body is greatly reduced, and the bulrush 6 planted on the surface layer can improve the effluent dissolved oxygen environment.
The application of the method in practice can be inspected by pumping into practical eutrophic water, the operation parameters and the treatment capacity are determined, and the proportion of the external carbon source filler reed stem and the phosphorus removal filler fly ash is optimized.
The bottom of the tank body can be provided with an impermeable layer, and the impermeable layer can adopt any suitable existing technology and other possible technologies. As a preferred embodiment, the impermeable layer can be sequentially provided with a bentonite pad layer, an HDPE geomembrane, a bentonite protective layer, a fine sand protective layer and a polyester non-woven geotextile layer from inside to outside from a base surface, the polyester non-woven geotextile is arranged on the fine sand protective layer, so that the integral protection effect on the geomembrane is provided, the integral and toughness of the polyester non-woven geotextile are utilized to support, homogenize and buffer external force/foreign matters from above, impurities are isolated at the same time, and pollution and biochemical reaction of the fine sand protective layer are reduced. The seam crossing between the geomembrane preferably adopts the build-up welding to weld, and the geomembrane welding edge that is located the upper strata is folding edge, when lapping upper geomembrane on lower geomembrane, reserve certain folding surplus, upwards turn up and fold on the main part of native geomembrane surplus part, form folding edge, carry out the build-up welding between the geomembrane with lower floor in edge after folding, this kind of welding mode not only makes things convenient for easy to do, and can guarantee welding area's intensity effectively in reality, and there is not the edge damage.
Can set up a plurality of collection exhaust riser in the cell body, it has a plurality of gas collection through-holes to distribute on the lateral wall of collection exhaust riser, and the outside parcel has one deck or multilayer non-metallic screen, for example nylon wire, the bottom of cell body is extended to the lower extreme of collection exhaust riser, and the upper end is exposed outside, and gas such as carbon dioxide and nitrogen gas that form because of biochemical reaction can get into collection exhaust riser and discharge automatically under the internal pressure effect in the pond, and the silk screen mesh of parcel in the outside can block particulate matter entering riser, allows to adopt relatively great gas collection through-hole on the riser from this, helps preventing the through-hole jam, increase of service life.
The bottom, middle and upper parts of each unit can be provided with an online temperature detector and/or pressure detector, the output of the online temperature detector and/or pressure detector is connected to the field control cabinet and displayed by the display of the field control cabinet, so as to conveniently know and judge the biochemical reaction condition in the pool body, for example, the temperature is an important environmental factor influencing the activity of flora, the pressure indicates the water and air permeability in the pool and the possible biochemical reaction problem, a relevant data processing circuit or device can be arranged in the field control cabinet according to the requirement, the output of the temperature/pressure detector is connected to the relevant data processing circuit or device to carry out the required display processing and other processing, for example, the data processing circuit or device can be provided with alarm output, when the detected temperature/pressure data meets the alarm condition, the alarm is given by an alarm indicator light and/or an alarm buzzer which are connected with the alarm output.
The higher authority of cell body can be equipped with vertical and/or horizontal pedestrian bridge, the both ends fixed mounting of pedestrian bridge is on pool wall or subaerial, from this, management and maintainer can walk and carry out the operation of looking over and overhauing by the short distance on the bridge.
The invention has the following characteristics:
by utilizing the characteristic that the volcanic rock has larger specific surface area and the nitrification of nitrifying bacteria, the dissolved oxygen in the inlet water is fully utilized, so that the ammonia nitrogen is effectively removed.
The reed stalks and the humus soil are used as external carbon source fillers, external carbon sources and attachment places for growth are provided for denitrifying bacteria, decomposition and release of different carbon sources in each period can be coordinated with each other by reasonable proportioning of the humus soil and the reed stalks and interception of organic pollutants in water, and the characteristics of the stalks, the humus soil and the organic pollutants are utilized, so that long-term stable carbon supply is formed, the denitrification effect of the system is enhanced, and a good long-term use effect is ensured.
Through selecting different plants, plant the reed that secretes the oxygen effect stronger in first unit and third unit, do benefit to the nitrification, plant cattail in the second unit, it is less to the side effect of denitrification to secrete the oxygen effect, and the root system of two kinds of plants is the growth of microorganism and provides the attachment site, and organic matters such as organic acid that the root system secretes have promoted the denitrification.
The control of constructed wetland rivers direction and the setting of bottom slope are favorable to the solid suspended solid deposit in the system bottom in the intaking to get rid of by the blow-down pipe when the unloading is washed, reduced the system and blockked up the risk.
The artificial wetland is in a saturated state for a long time, which is beneficial to maintaining an anoxic environment and promoting the denitrification to be carried out.
The gravel and the fly ash are used as main fillers of the third unit, so that the phosphorus removal effect of the system is enhanced, particularly, the optimized gravel particle size and the proportion of the gravel particle size can be selected according to experiments (for example, under the optimized parameters disclosed by the invention), the smoothness of water flow is ensured, and a water flow structure formed by the surface shape of the gravel is utilized, so that the fly ash forms a micro state similar to a fluidized bed in a gravel gap under the driving of the water flow, and the phosphorus removal effect is;
the water flow is upward flow, so that the possibility of short circuit of the water flow is reduced, and solid suspended matters contained in the inlet water are deposited on the bottom layer, so that the blocking risk is reduced;
compared with the traditional vertical subsurface flow constructed wetland, the vertical subsurface flow constructed wetland has no need of a water distribution pipeline, thereby saving the manufacturing cost;
the unit setting is favorable to maintaining different purification conditions in different units, and the second processing unit mainly is the denitrification district, fills a certain amount of humus soil, contains a large amount of microorganisms in the humus soil, has shortened system startup time, plants cattail that secretes oxygen ability limited, and the third processing unit is filled for rubble and fly ash, strengthens dephosphorization effect under the ordinary prerequisite of assurance rivers.
The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.

Claims (9)

1. A composite flow constructed wetland system for strengthening the treatment of eutrophic water is characterized by comprising a tank body, wherein a plurality of vertical air collecting and exhausting pipes are arranged in the tank body, the tank body is sequentially divided into a first unit, a second unit and a third unit along the water flow direction, the bottom of each unit is provided with a water distribution layer, the rear end of each unit is provided with an overflow weir, the water outlet of the overflow weir of the first unit and the water outlet of the overflow weir of the second unit are respectively connected into the water distribution layers of the second unit and the third unit, the system inlet water is connected into the water distribution layer of the first unit, the overflow outlet of the third unit is connected into a water outlet groove behind the third unit, the water outlet groove is provided with a system water outlet pipe, the water distribution layer is filled with particle fillers, and gaps forming water distribution channels are reserved among the particle fillers of the water distribution layer, each all be equipped with main packing layer above the water distribution layer of unit, each all be equipped with the top layer above the main packing layer, each unit the top layer all adopts the fine sand layer, the main packing layer of first unit and the main packing layer of third unit all adopt inorganic grained layer, the main packing layer of second unit includes organic filter material layer and is located inorganic grained layer above the organic filter material layer, organic filter material layer comprises the mixture of garrulous section of straw and humus soil or comprises garrulous section layer of straw and humus soil layer that upper and lower alternate distribution, all planted the reed in first unit and the third unit, plant cattail in the second unit.
2. The system of claim 1, wherein the number of at least one of said straw rag layers and said humus layers among said straw rag layers and said humus layers distributed at intervals is a plurality of layers.
3. The system of claim 1, wherein the layer of inorganic particles of the first unit and the layer of inorganic particles of the second unit each comprise a layer of volcanic rock particles and the layer of inorganic particles of the third unit comprises a layer of a mixture of gravel and fly ash.
4. A system according to claim 1, 2 or 3, wherein the bottom surface of the tank body is a longitudinal inclined surface with a high front and a low rear.
5. The system of claim 4, wherein the bottom of each unit is provided with a longitudinally extending central projection, the central projection being located at a middle portion in the left-right direction.
6. The system according to claim 1, 2 or 3, wherein the upper portions of the side walls of the first and second units are each provided with a side overflow pipe, the overflow pipe being located at the rear portion in the longitudinal direction of the unit, and the overflow height of the side overflow pipe is higher than that of the overflow weir of the unit.
7. The system according to claim 1, 2 or 3, characterized in that the bottom of the side wall of each unit is provided with a lateral vent pipe, the vent pipe is positioned at the rear part of the unit in the longitudinal direction, the vent pipe penetrates through the side wall of the unit, the inner end of the vent pipe is positioned at the water distribution layer of the unit, the outer end of the vent pipe extends out of the side wall of the unit or forms a water outlet on the side wall of the unit, and the lateral vent pipe is provided with a vent control valve.
8. The system as claimed in claim 1, 2 or 3, wherein the bottom of the first unit is provided with a perforated pipe extending longitudinally, the front end of the perforated pipe is connected with a flushing water pump through a pipeline, and the rear end port is closed.
9. A system according to claim 1, 2 or 3, wherein the system water enters the water distribution layer of the first unit by: the tail end of the system water inlet pipe is connected with the front end of the water distribution layer of the first unit through a first water guide gallery at the front end of the first unit, and the water outlet of the overflow weirs of the first unit and the second unit is respectively connected into the water distribution layers of the second unit and the third unit in a mode that: the overflow water of the first unit is connected with the front end of the water distribution layer of the second unit through a second water guide gallery positioned at the front end of the second unit, the overflow water of the second unit is connected with the front end of the water distribution layer of the third unit through a third water guide gallery positioned at the front end of the third unit, the first water guide gallery is formed by a gap reserved between the inner wall of the front end of the tank body and the front end plate of the first unit, the second water guide gallery is formed by a gap reserved between the rear end plate of the first unit and the front end plate of the second unit, the third water guide gallery is formed by a gap reserved between the rear end plate of the second unit and the front end plate of the third unit, the top of the rear end plate of each unit forms an overflow weir of the unit, the bottom of the tank body is connected with the bottom of the front end plate of each unit, and a gap constituting a water flow channel is reserved between the bottom of the front end plate of the tank body, the top of the front end plate of the first unit is higher than the height of the system water inlet pipe, and the top of the front end plate of the second unit and the top of the front end plate of the third unit are respectively higher than the height of the overflow weir of the first unit and the height of the overflow weir of the second unit.
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CN108726804B (en) * 2018-06-13 2022-12-09 深圳市大鹏园林生态建设有限公司 Enhanced nitrogen and phosphorus removal constructed wetland system based on plant optimization configuration

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CN101638264A (en) * 2009-08-27 2010-02-03 同济大学 Sponge anti-clogging strengthening compound flow constructed wetland domestic sewage treatment device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101172712A (en) * 2007-10-23 2008-05-07 重庆大学 Process method for stairway composite ecological bed clarified sewage and ecological bed thereof
CN101638264A (en) * 2009-08-27 2010-02-03 同济大学 Sponge anti-clogging strengthening compound flow constructed wetland domestic sewage treatment device

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