CN204185336U - For the stereo ecological gallery system of river water body in-situ immobilization - Google Patents

Abstract

The utility model discloses a kind of stereo ecological gallery system for river water body in-situ immobilization, comprise interception unit, pretreatment unit, wetland unit, greening cut-off filter unit, back flushing unit, drain off floodwaters unit and plant control unit.The utility model effectively can solve existing artificial swamp and need intermittent operation and the long-time running susceptible to plugging technical barrier of filler later, improves treatment effect and the anti impulsion load ability of whole system, reduces floor space, have flood control function concurrently simultaneously.And the multinomial optimisation technique of the utility model collection forms perfect ecological purification system, realizes the organic unity of urban river water environmental improvement, Ecological Recovery of Water.Have floor space little, can affect in water course in situ process and not that the demand of drainning off floodwaters, treatment effect are good, nitrogen phosphorus ligands ability strong, answer impact load adaptable, grow without mosquitos and flies, the advantage such as operation maintenance management is convenient, be applicable to process the river course being subject to sanitary sewage and industrial wastewater pollution.

Description

For the stereo ecological gallery system of river water body in-situ immobilization

Technical field

The utility model relates to Ecology technology of waste water control field, is specifically related to a kind of stereo ecological gallery system for river water body in-situ immobilization.

Background technology

City river, as the important component part in urban look, will be not only the domestic water of city supply resident, also will ensure the process water in city, water for fire-fighting purpose and green area irrigation etc.In multiple composition systems in city, river course has flood control and water drain function, Landscape Culture function, ecological environment function and rainwater utilization function etc., serves positive pushing effect to the progress in city and development.Therefore, build good urban river ecological system, from the angle of Sustainable development, the development of the mankind and continuity are played an important role.

Along with the high speed development of urban economy, the quickening of urbanization and process of industrialization, city river water surrounding receives serious pollution and destruction.Contaminated urban river water is detained, river channel sedimentation, and water body muddiness occurs black smelly even often, and its original work of polluted river are that the function at life and process water water source completely loses; What urban river water had beautifies the environment, regulate the functions such as city miniclimate, landscape tourism greatly to decline, the deposition in river course, silt up make shipping, flood control function significantly degenerates.The deterioration of water surrounding makes human settlement environment in city and landscape effect receive havoc, therefore carries out Water quality restoration to urban river very urgent.

For the surface water body reparation such as river, lake, theory that is comparatively advanced and science is that ecology is harnessed the river at present, with regard to concrete technology trends, Artificial Wetland Techniques is exploitation both at home and abroad in recent ten years and has been successfully used to administer the new technology of polluted water body reparation, is also the important trend of ecological reestablishment development.Owing to mostly adopting single Artificial Wetland Techniques at present at home, contaminated urban river water is administered, shortage take artificial swamp as the integrated technology of wherein a certain single technology, therefore purification of water quality unit is caused to be difficult to process the polluted water of high-pollution load, also exist COD clearance low, total removal efficiency is low, and wet land filler such as easily to block at the deficiency.Particularly artificial swamp is owing to taking up an area problem, with ecological land in the city proper such as Shanghai in short supply to give shield very outstanding.Therefore, the integrated technology how artificial swamp and other technologies combine by research and river process organically combine, and utilize the existing land used in river course to build water purification system, the ecotope in improvement and landscape restoration river course is the problem needing solution badly.

Utility model content

In view of the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of stereo ecological gallery technology for river water body in-situ immobilization.This technology in process city river sewage, without the need to water pump lifting, can realize in-situ treatment polluted water body in river course, does not take or take two sides land used less, and efficiently solving the needs of river course flood; This technical finesse efficiency is high, and the pollutant load that can bear is large, thoroughly can remove the black smelly or eutrophication problem in river course, and treatment effect is stablized.

According to a kind of stereo ecological gallery system for river water body in-situ immobilization that the utility model provides, comprise the interception unit, pretreatment unit, wetland unit, plant control unit, the airing system that set gradually along upstream, river course to downstream direction;

Described interception unit, for tackling the foreign material in upper river water;

Described pretreatment unit, for the water through described interception unit, carries out aeration and microbiological deterioration;

Described wetland unit, for making the water through described pretreatment unit, flows through top layer and the bottom of a body repeatedly along wave seepage paths, namely repeatedly through aerobic and process that is anaerobism, realize the removal to pollutent;

Described plant control unit, for the water through described wetland unit, utilizes artificial floating bed plantation emergent and floating plant to carry out suspended substance interception, the absorption of nitrogen phosphorus.

Preferably, also comprise following any one or appoint multiple device:

Back flushing unit, for carrying out back flushing to the filler of wetland unit;

Greening diafiltration tape cell, for being arranged on the bank in river course, interception pollutent enters river course;

Drain off floodwaters unit, for providing the pipeline that drains off floodwaters between the head and the tail of wetland unit.

Preferably, described interception unit adopts stainless steel grid or stainless steel mesh.

Preferably, also comprise greening diafiltration tape cell, greening diafiltration tape cell is distributed in the both sides of interception unit, pretreatment unit, wetland unit, plant control unit, and greening diafiltration tape cell comprises basic unit and plants the plant in basic unit.

Preferably, described pretreatment unit, comprises aeration pipe network, flexible filler, aeration head and floating plant;

One end of aeration pipe network is higher than flexible filler and be connected with airing system, and the other end of aeration pipe network extends to the below of flexible filler and connects aeration head; Floating plant is arranged on the top of flexible filler.

Preferably, described wetland unit comprises the multiple tracks partition wall set gradually along upstream, river course to downstream direction, is filled with porous filler between adjacent partition wall; Plant above porous filler and be implanted with wetland plant;

The partition wall being positioned at most upstream is the water hole partition wall that water hole is contained on top, and the partition wall being positioned at most downstream is the cross flow partition wall that top can form cross flow, and wherein, the top of described cross flow partition wall is lower than the top of water hole partition wall;

At the described partition wall in most upstream and described between the partition wall of most downstream, along upstream, river course to downstream direction:

-be provided with the water hole partition wall containing water hole in 1 bottom, road; Or

-be arranged alternately the water hole partition wall, the cross flow partition wall that contain water hole in bottom successively.

Preferably, described plant control unit, comprises submerged plant, the first emergent, the second emergent, floating bed;

Second emergent is planted in floating bed.

Preferably, porous filler comprises any one or more combination in gravel, slag, heavy water haydite etc.; Wetland plant comprises any one in Canna generalis Bailey, yellow flag, calamus, cattail, reed or appoints various plants.

Preferably, described back flushing unit, comprise Backwash pipeline, wherein, described Backwash pipeline is arranged on the below of the filler of described wetland unit, back flushing unit is set bottom described wetland unit to solve wet land filler blockage problem, outputs pore respectively in position, both sides, Backwash pipeline bottom.

Preferably, described in drain off floodwaters unit, comprise water pipeline, overflow spout, valve;

Water pipeline through the head and the tail two ends of described wetland unit, and is positioned at the bottom of wetland unit, and the upstream extremity of water pipeline is provided with valve;

Overflow spout through the head and the tail two ends of described wetland unit, and is positioned at the top of wetland unit, and the upstream extremity of overflow spout is provided with valve.

According to a kind of method for river water body in-situ immobilization that the utility model provides, it utilizes the above-mentioned stereo ecological gallery system for river water body in-situ immobilization, carries out in-situ immobilization to river water body.

Compared with prior art, the utility model has following beneficial effect:

1, the utility model effectively solves existing artificial swamp and needs intermittent operation and the long-time running susceptible to plugging technical barrier of filler later, improves treatment effect and the anti impulsion load ability of whole system, reduces floor space, have flood control function concurrently simultaneously.

2, the utility model is integrated by multinomial technical optimization, forms perfect ecological purification system, plays that multiple technologies are complementary, synergistic integrated advantage, realizes the organic unity of urban river water environmental improvement, Ecological Recovery of Water and landscape function.

3, the utility model have floor space little, can affect in water course in situ process and not that the demand of drainning off floodwaters, treatment effect are good, nitrogen phosphorus ligands ability strong, answer impact load adaptable, grow without mosquitos and flies, operation maintenance management is convenient, have the advantages such as landscape function, be applicable to process the river course being subject to sanitary sewage and industrial wastewater pollution.

Accompanying drawing explanation

By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present utility model will become more obvious:

Fig. 1 is two dimensional structure schematic diagram of the present utility model.

Fig. 2 is cross-sectional view of the present utility model.

Fig. 3 is wetland unit vertical section structure schematic diagram of the present utility model.

Fig. 4 is wetland unit back flushing of the present utility model horizontal arm vertical section structure schematic diagram.

In figure:

Interception unit	1
		Aeration pipe network	2
Flexible filler	3
		Aeration head	4
First water hole	5
		First partition wall	6
Second partition wall	7
		Backwash tube	8
Concrete foundation	9
		Floating plant	10
Wetland plant	11
		Second water hole	12
Valve	13
		First water pipeline	14
Second water pipeline	15
		Many components filler	16
Submerged plant	17
		Emergent	18
Floating bed	19
		Lawn green belt	20
The horizontal arm of back flushing	21
		Production well	22

Embodiment

Below in conjunction with specific embodiment, the utility model is described in detail.Following examples will contribute to those skilled in the art and understand the utility model further, but not limit the utility model in any form.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, some distortion and improvement can also be made.These all belong to protection domain of the present utility model.

The technical problem that the utility model solves can be realized by following scheme:

(1) interception unit

Thick rubbish and floating matter, before entering water purification system, are first tackled outside grid through a stainless steel grid (or stainless steel mesh) by upper river water, and the outer rubbish of grid is regularly cleared up.

(2) pretreatment unit

It is pretreatment unit between grid and partition wall, pretreatment unit is lived for river course or industrial sewage affects that the Pollutant levels caused are high, the discharge of sewage is unstable and a kind of processing unit of design, and the technology such as this collection of units micro-pore aeration, flexible filler catalytic oxidation and plant control are in one.

The water surface adopts floating island technique planting aquatic plants, the whole river surface of vegetal cover, plays landscape function on the one hand, reduces river surface stink on the other hand.Meanwhile, by the degraded of plant absorption and root system surface microorganism, also part pollutent can be removed.

Bottom, chinampa hangs biofilm carrier, can be the attachment interface that microorganism provides good, forms microbial film at filling surface, reduces the loss of microorganism in sewage treatment process, improves the ability of system antipollution load, thus greatly improves the effect of sewage disposal.

Bottom of river channel is aided with micro-pore aeration, increases the dissolved oxygen in water body, for microbiota metabolic activity provides oxygen source.Micro-pore aeration has the advantages such as oxygen-transfer efficiency is high, energy consumption is low, noise is little.

(3) polycomponent waves stream wetland unit

Artificial wetland treatment unit is positioned at the downstream of pretreatment section, adopts waves flow structure.Waves stream wetland is a kind of novel artificial swamp structure formation, and inner at waves stream wetland, water body flows through top layer and the bottom of a body repeatedly along wave seepage paths, namely repeatedly through aerobic and process that is anaerobism, realizes the efficient removal to pollutent.This unit is made up of three key components: plant, microorganism and matrix.Water-fast plant takes root in matrix bed, in bed body, water body has been expired in leaching, matrix supports these plants, the root system of plant is then for various microorganism provides existence home, give full play to the coordinative role between system, in equal area situation, processing power increases substantially, and can overcome the shortcoming that natural bioremediation is more fragile, has that rate of load condensate is high, floor space is little, reliable for effect a, anti impulsion load and not easily grow the advantages such as mosquitos and flies.

(4) plant control unit

Planting aquatic plants is the key link building river channel ecology system.Waterplant effectively can not only remove COD in water body and nitrogen, phosphorus, and also can supply nutrients and living environment for hydrocoles, be indispensable integral part in river channel ecology system.

Plant control region mainly utilizes artificial floating bed to plant emergent and floating plant, utilizes floating bed automatically can carry out adjusting according to water level the feature of height, creates growing environment condition, be conducive to surviving and growing of plant to emergent and floating plant.At river bed kind planting submerged plant, play interception suspended substance, absorbed nitrogen phosphorus, the decontamination effect improving such as to enhance the transparency.

(5) diafiltration tape cell is afforested

In conjunction with distribution situation and the land use for greening resource of two sides, river course green belt, two sides land use for greening is transformed into green belt filtration system with suiting measures to local conditions, green belt filtration system underfill matrix fill, the plant that matrix fill surface grafting landscape effect is good, soil removability is strong, play the function of Afforestation Landscape on the one hand, play on the other hand the effect of interception pollution of area source, pollutent is entered in river course after ecological cut-off filter band carries out being detained or decomposes a part.

(6) drain off floodwaters unit

Because wetland unit is arranged in river course, consider that the flood control function of flood drainage in river course is provided with flood control unit.First above the inner blotter of wetland unit, lay UPVC reinforcement water shoot, and valve is set at first partition wall, opened a sluice gate before heavy rain arrives, water level in river course can be fallen in advance.Secondly be provided with 2 UPVC reinforcement water shoots on wetland unit top, open gate when bottom discharge pipe has little time draining, strengthen draining dynamics.Partition wall elevation is lower than river course high-water elevation again, and when running into cataclysm, upland water can directly from overflow above wetland unit.

(7) back flushing unit

Block to prevent wetland unit, backwash tube is provided with in wetland unit filler, pipe network system is connected into by pipeline, even cloth production well on backwash tube, when filler blocks, by house steward, backwash tube is inflated, back flushing is carried out to filling system, effectively can solve the blockage problem of wetland unit filler, substantially prolongs the work-ing life of wetland unit.

More specifically, refer to Fig. 1, Fig. 2 and Fig. 3, upland water horizontal plug-flow after interception unit 1 is tackled in river course enters pretreatment unit, and the kind of described interception unit 1 is not limit, as long as can tackle thick rubbish and floating matter.Preferably, described interception unit 1 can be the one in stainless steel grid or stainless steel mesh.

Pretreatment unit comprises aeration pipe network 2, flexible filler 3, aeration head 4 and floating plant 10, aeration pipe network 2 one end is communicated with extraneous air feeder, the other end connects aeration head 4, and aeration head 4 is micro-pore aeration, and air-flow blasts bottom of river channel by aeration pipe network 2 through aeration head 4 and carries out aeration.Micro-pore aeration pipe network 2 is located at the above 0.5m place of bottom of river channel, prevents sludge blockage aeration head 4.Preferably, described air feeder can be the one in gas blower, air compressor or compressed air tank.Air feeder is connected with aeration pipe network 2 by airflow duct, and described airflow duct can be metal hose, can be rigid pipe, also can be partly metal hose, part for rigid pipe, specifically can arrange according to practical situation.Aeration head 4 top is Multiple-Aperture Device flexible filler 3, and flexible filler 3 is submerged in water, as long as can provide carrier for germs collect growth.In the present embodiment, flexible filler 3 is biofilm carriers of a kind of bionic system, and every cubic metre of carrier specific surface area can reach 250 square metres.Water surface planting floating plant 10, preferably stronger to nitrogen phosphorus receptivity in water plant.In the present embodiment, floating plant 10 selects wilson iris.

River, after pretreatment unit process, enters wetland unit from wetland unit first partition wall 6 top first, road first water hole 5.Wetland unit head and the tail two ends partition wall is 37 walls, and infrastructure is reinforced concrete foundation 9.In order to ensure that wetland unit enters plant control unit from top water outlet cross flow, wetland unit can be divided into even number storehouse, as: 2,4,6 storehouses etc., specifically can determine according to river course practical situation, in the present embodiment, wetland unit is divided into 4 storehouses.Every storehouse central filler different sorts many components filler 16, multi-component filler 16 is porous filler, all has the voidage of different size, as long as can ensure that water body flows and provides carrier for microorganism growth between filler.Preferably, multi-component filler 16 can be two or more arbitrary combination (in change case, also can only be made up of a kind of filler) in the fillers such as air entraining particle, rubble, haydite, slag, gravel or volcanics.In the present embodiment, multi-component filler 16 adopts heavy water haydite to be main, and certain thickness gravel and slag are established in bottom.Current evenly flow in wetland unit from top first water hole 5, downward flow forward according to this, with wavy flow to bottom second water hole, on backward through bottom second water hole forward above wavy flow to the 3rd road second partition wall, from the mistake as cross flow above the second partition wall of cross flow partition wall, and then entering bottom the second water hole, flowing is until last storehouse cross flow enters downstream plant control unit so according to this.Except head and the tail twice partition wall, due to both sides stress balance, midfeather is 24 walls, builds by laying bricks or stones near horizontal elevation from bottom of river channel, and the partition wall elevation that current are crossed from bottom, higher than the water surface, needs the partition wall elevation of cross flow lower than the water surface.In filler, plant wetland plant 11 above wetland unit, wetland plant 11 should have functions such as purifying water and beautify the environment.Preferably, wetland plant 11 can be one in the emergents such as Canna generalis Bailey, yellow flag, calamus, cattail or reed or arbitrary combination.In the present embodiment, wetland plant 11 selects Canna generalis Bailey.

At downstream plant control unit, bank kind submerged plant 17 and emergent 18, floating bed 19 is placed at depth of water place, purifies water and beautiful environment as long as can play.Preferably, submerged plant 17 can be the one or any combination in hornwort, hydrilla verticillata, najas marina, water caltrop or waterweed, wherein hydrilla verticillata kind in suitable summer, water caltrop and waterweed kind in suitable winter, Various Seasonal two class plant alternating growth, can ensure that annual interior purifying water effect is good.Emergent 18 can be the one or any combination in reed, cattail, water chestnut grass, water chestnut is careless and cattail blade more stem stalk is not obvious, and the obvious blade of reed stem is less, the difference in these kinds by the difference causing plant to absorb nutrient salt in water, make up respective defect.Floating bed 19 can be planted the one or any combination in lotus, Scirpus tabernaemontani, Canna generalis Bailey, wild rice stem, Spiked Loosestrife, can original ecotope be improved.

Two sides bank protection arranges ecological cut-off filter tape cell, filling substrate filler in basic unit, matrix can be one in soil, straw, sawdust or arbitrary combination, and in the present embodiment, matrix selects soil.Turf plant green belt in matrix, lawn green belt can be one in Bermuda grass, annual bluegrass, Festuca Arundinacea, Trifolium repense, Semen astragali sinici, folium ilicis chinensis lawn or arbitrary combination, in the present embodiment, plantation folium ilicis chinensis lawn.When two sides, river course are shore protection, described ecological cut-off filter tape cell can save.

Backwash pipeline 8 is provided with in the below of wetland unit, Backwash pipeline supervisor caliber is Ф 100, vertically be connected in lower floor's back flushing pipe network, the horizontal branch diameter of back flushing is Ф 20 pipeline, and Backwash pipeline 8 must can be born the pressure of design requirements and be had anti-corrosion function.Preferably, Backwash pipeline 8 can be the one that steel pipe or steel mould in pipe.When the horizontal arm of the back flushing of bottom being outputed pore to ensure back flushing, air-flow is discharged smoothly and is cleaned many components filler 16 in pipeline.Production well perforate mode refers to Fig. 4, and in 45 °, the both sides position perforate of back flushing horizontal arm bottom, prevent horizontal arm top filler blocking production well, described open pore size is generally 0.2 ~ 0.8mm, gets 0.5mm in the present embodiment.General, production well perforate spacing 50 ~ 100cm, the horizontal arm tube spacing of bottom back flushing 50 ~ 100cm, duct end is shut.In the present embodiment, described perforate spacing gets 50cm, and horizontal arm tube spacing gets 50cm.When wetland unit blocks, inflated supervisor by extraneous air feeder, hydrous water stream carries out back flushing.Identical with pretreatment unit of described external air feeder.

For the unit that drains off floodwaters, first water pipeline two is installed on wetland unit top, second water pipeline one is installed bottom wetland unit, as long as the river that upstream is come can be discharged in time, and respectively at the water-in mounted valve 13 of the first water pipeline, the second water pipeline, close when water level is normal.In this example, the first water pipeline selects caliber Ф 600mm, and the second water pipeline selects caliber Ф 800mm.When meeting Heavy Rain, the gate opened on the second water pipeline makes flood directly flow to downstream from the second water pipeline, when the second water pipeline cannot discharge the river come upstream in time, open the valve on two first water pipelines, three water pipeline drainings simultaneously.Now, the first water pipeline, the second water pipeline serve the effect surmounting pipe.Design partition wall elevation in addition higher than ordinary water level, when running into extra torrential rain, flood can directly drain off floodwaters from the overflow of wetland unit top, does not now consider contaminant degradation problem, with flood passage safely for first.

Ecology corridor system long-width ratio described in the utility model is determined according to river practical situation, pretreatment unit long-width ratio is generally not less than 2:1 and is not more than 4:1, wetland unit long-width ratio is generally not less than 6:1 and is not more than 10:1, and plant control unit long-width ratio is generally not less than 20:1 and is not more than 40:1.

Operation scheme: run continuously, pretreatment unit theoretical residence time 16.8h, wetland unit theoretical residence time 25.9h, plant control unit theoretical residence time 144h.

A kind of for the utility model stereo ecological gallery for river water body in-situ immobilization is built in city river, is applied in certain river water quality recovery project, day process water yield 1000m ³, after this Water quality restoration ecology corridor is built up, the average treatment effect running 2 years is continuously as shown in table 1.

Table 1 stereo ecological gallery runs 2 years water quality condition contrast tables (mean value) continuously

Water quality parameter	Water inlet	Water outlet	Clearance (%)
				Ammonia nitrogen NH 3-N/(mg/L)	27.0±8.5	13.3±5.8	53.4±10.4
Total phosphorus TP/ (mg/L)	2.4±0.8	1.0±0.3	56.6±10.1
				Chemical oxygen demand COD Cr/(mg/L)	210.2±73.1	66.9±38.6	67.2±13.2

This stereo ecological gallery river water body recovery technique solves that the useful area that long-standing problem city river exists is few, in-situ treatment efficiency is low, integrated technology causes that river water quality is unstable, artificial swamp easily blocks less, cannot with the difficult problem combined of drainning off floodwaters, to be specially adapted to naturally in the city in or manually operated can the contaminated river water body reparation of uniflux.

Above specific embodiment of the utility model is described.It is to be appreciated that the utility model is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present utility model.

Claims (4)

1. for a stereo ecological gallery system for river water body in-situ immobilization, it is characterized in that, comprise the interception unit, pretreatment unit, wetland unit, plant control unit, the airing system that set gradually along upstream, river course to downstream direction;

Described interception unit adopts stainless steel grid or stainless steel mesh;

Described pretreatment unit, comprises aeration pipe network, flexible filler, aeration head and floating plant; One end of aeration pipe network is higher than flexible filler and be connected with airing system, and the other end of aeration pipe network extends to the below of flexible filler and connects aeration head; Floating plant is arranged on the top of flexible filler;

Described wetland unit comprises the multiple tracks partition wall set gradually along upstream, river course to downstream direction, is filled with porous filler between adjacent partition wall; Plant above porous filler and be implanted with wetland plant; The partition wall being positioned at most upstream is the water hole partition wall that water hole is contained on top, and the partition wall being positioned at most downstream is the cross flow partition wall that top can form cross flow, and wherein, the top of described cross flow partition wall is lower than the top of water hole partition wall; At the described partition wall in most upstream and described between the partition wall of most downstream, along upstream, river course to downstream direction:

-be provided with the water hole partition wall containing water hole in 1 bottom, road; Or

-be arranged alternately the water hole partition wall, the cross flow partition wall that contain water hole in bottom successively;

Described plant control unit, comprises submerged plant, the first emergent, the second emergent, floating bed; Second emergent is planted in floating bed.

2. the stereo ecological gallery system for river water body in-situ immobilization according to claim 1, it is characterized in that, also comprise back flushing unit, described back flushing unit comprises Backwash pipeline, wherein, described Backwash pipeline is arranged on the bottom of the filler of described wetland unit, arranges back flushing unit to solve wet land filler blockage problem, output pore respectively in position, both sides, Backwash pipeline bottom bottom described wetland unit.

3. the stereo ecological gallery system for river water body in-situ immobilization according to claim 1, it is characterized in that, also comprise greening diafiltration tape cell, greening diafiltration tape cell is distributed in the both sides of interception unit, pretreatment unit, wetland unit, plant control unit, and greening diafiltration tape cell comprises basic unit and plants the plant in basic unit.

4. the stereo ecological gallery system for river water body in-situ immobilization according to claim 1, is characterized in that, also comprise the unit that drains off floodwaters, described in the unit that drains off floodwaters comprise water pipeline, overflow spout, valve;

Water pipeline through the head and the tail two ends of described wetland unit, and is positioned at the bottom of wetland unit, and the upstream extremity of water pipeline is provided with valve;

Overflow spout through the head and the tail two ends of described wetland unit, and is positioned at the top of wetland unit, and the upstream extremity of overflow spout is provided with valve.