CN206858272U - The artificial wet land system of simultaneously strengthened denitrification is blocked suitable for alleviating using earthworm - Google Patents

Abstract

The utility model provides a kind of artificial wet land system alleviated using earthworm and block simultaneously strengthened denitrification, the first thin inorganic filler layer is from top to bottom sequentially provided with its first module, first thick inorganic filler layer, first main packing layer and the first collection water layer, the top of the first thin inorganic filler layer is provided with the first water distributor, second organic pervious bed is from top to bottom sequentially provided with its second unit, second main packing layer and the second collection water layer, the top of second organic pervious bed is provided with the second water distributor, the water leg of first module delivery port and second unit water inlet is connected between the first module and second unit, second delivery port connects the adjustable System drainage pipe of freeboard, kind is implanted with reed and wild rice stem respectively in the first module and second unit.The utility model suitably incorporates earthworm, can effectively alleviate Wetland clogging problem during wetland is run, and can strengthen wetland denitrification effect, improves overall level of purification.

Description

The artificial wet land system of simultaneously strengthened denitrification is blocked suitable for alleviating using earthworm

Technical field

A kind of artificial wet land system for being suitable to alleviate blocking and strengthened denitrification using earthworm is the utility model is related to, belongs to environment Protection and pollution control technology field.

Background technology

Artificial swamp refers to manually building, controllable and engineering wet land system, and it is designed and construction is to pass through Dirt is carried out to optimum organizations such as the physics in wetlands ecosystems, chemistry and biological agents（It is useless）Water process.

According to investigation of the EPA to artificial swamp in more than 100 operations, the wet land system for having nearly half is put into There is blockage problem in 5 years after use, its hydraulic conductivity reduces, and scavenging effect is deteriorated, and service life shortens.Manually The blockage problem of wetland increasingly becomes the obstacle of its application so that seeks corresponding solution and preventive measure is very necessary It is and urgent.Artificial swamp blocks mainly relevant with suspension, organic matter and biomembrane accumulation in sewage.Suspension particle diameter is dense Spend height, it will cause Wetland clogging；Organic loading it is too high exceed matrix in microorganism decomposition ability when, be not decomposed organic Thing will accumulate in matrix, and then trigger artificial swamp to block；Biomembrane accumulation is also the reason for causing artificial swamp to block One of.

Limited reoxygenation ability and poor oxygen environment cause the nitre of ammonia nitrogen in horizontal drowned flow and vertical subsurface flow wetland Change process turns into the main rate-limiting step of marsh sewage treatment system denitrogenation, improves wetland bed reoxygenation ability, improves wetland bed body In oxygen environment to improve wet land sewage purification effect it is most important；Carbon source concentration is very low in water outlet so that wet land system water outlet The nitrate nitrogen of middle enriched, it directly limit its thorough removing to total nitrogen, it is desirable to carry out follow-up denitrogenation processing process, it is necessary to Extra addition carbon source, adds somewhat to cost and the difficulty of operation maintenance.

On the other hand, earthworm movement can to it is residual fall organic matter carry out Mechanical Crushing, loose artificial swamp matrix, improve base It the porosity of matter, on the one hand can effectively alleviate substrate clogging problem, more oxygen is entered matrix, be advantageous to The growth of oxygen animalcule, so as to improve the nitration reaction in artificial swamp；Earthworm crushes reed rod and provided for follow-up denitrogenation processing Carbon source, strengthen anti-nitration reaction, therefore, through applicant's experimental verification, artificial swamp can be improved using earthworm, with solution The above mentioned problem of certainly existing artificial swamp, alleviate Wetland clogging, extend the wetland life-span, while recycling wetland plant Strengthen wetland denitrification system.

Utility model content

For the drawbacks described above of prior art, the utility model is provided a kind of alleviated using earthworm and blocks simultaneously strengthened denitrification Artificial wet land system, this wet land system suitably incorporates earthworm, to alleviate Wetland clogging, extends the wetland life-span, in recycling Utilize the denitrification for strengthening wetland while wetland plant.

The technical solution of the utility model is：

It is a kind of to alleviate the artificial wet land system for blocking simultaneously strengthened denitrification, including first module and second unit using earthworm, Each unit uses the vertical subsurface flow mode of upper entering and lower leaving, and water distribution structure is located at the top of unit, and water collecting structure is positioned at single The bottom of member, it is characterised in that the first thin inorganic filler layer, first thick inorganic is from top to bottom sequentially provided with the first module Packing layer, the first main packing layer and the first collection water layer, the first collection water layer forms the water collecting structure of the first module, described The top of first thin inorganic filler layer is provided with the first water distributor, and first water distributor forms the water distribution knot of the first module Structure, second organic pervious bed, the second main packing layer and the second collection water layer are from top to bottom sequentially provided with the second unit, it is described Second collection water layer forms the water collecting structure of the second unit, and the top of second organic pervious bed is provided with the second water distributor, Second water distributor forms the cloth water-bound of the second unit, is provided with and catchments between the first module and second unit Groove, the first collection water layer are provided with the first delivery port, and the second collection water layer is provided with the second delivery port, first delivery port with The import of second water distributor connects the water leg.

The bottom level of the second unit is preferably shorter than the bottom level of the first module, in favor of forming the nothing of water Dynamic flow.

Second delivery port can be connected with System drainage pipe.

The System drainage pipe preferably uses the adjustable structure of outlet height, such as with bent flexible pipe, by curved Pipe changes water outlet height, or is arranged to the stretchable structure being mutually socketed by some sleeve pipes, is adjusted out by stretching mode Water height, it is possible thereby to by the freeboard of regulating system drainpipe, the height of water level in second unit is adjusted, and then adjust The zone of action of introduced earthworm and metabolism degree in second unit.

For example, gone out between second delivery port and the System drainage pipe using permission System drainage pipe relative to second The movable connection method connection that the mouth of a river is spun upside down, the System drainage pipe are provided with the upset positioning dress for being used to fix its position Put, or, the System drainage pipe is made up of drainpipe inlet segment and drainpipe water exit end, the drainpipe inlet segment and draining Connected between pipe water exit end using the movable connection method for allowing drainpipe water exit end to be spun upside down relative to drainpipe inlet segment, The drainpipe inlet segment is fixedly connected with second delivery port, and the drainpipe water exit end, which is provided with, to be used to fix its position Overturning and positioning device.

Second water distributor can use the structure that cloth water out is fixed, for example, fixation is erected at carrying in pond body The pipeline of fixed cloth water out, in the case, the highly preferred of cloth water out of second water distributor is less than（Containing end value, Similarly hereinafter）The bottom of the first thin inorganic filler layer and it is higher than（Without end value, similarly hereinafter）The bottom of first thick inorganic filler layer, or Person is preferably shorter than the top of the first thick inorganic filler layer and higher than 3/4 height of the first main packing layer, so as to thin inorganic first Formed in stratum granulosum or the first thin inorganic particles and the first thick inorganic particles and be suitable to the moistening that earthworm grows and not by water The environment of immersion.

Preferably, second water distributor uses the adjustable structure of water distribution outlet height, and adjustable range can include first Altitude range corresponding to thin inorganic filler layer and the first thick inorganic filler layer, or it is some larger, filled out for example, lower limit is led to first 2/3 height of the bed of material, regulation of the prior art realization of any suitable to the second water distributor water distribution outlet height can be used, with According to the height for the cloth water out for being actually needed the second water distributor of regulation, and then adjust the immersion height of water level of first module.Example Such as, the main part of the second water distributor is arranged on the adjustable support that it can be driven to move up and down, its inlet segment can be adopted With the bend pipe extended downwardly, in order to which when it is moved up and down, the import of inlet segment is immersed in the water of water leg all the time, thus By adjusting the water distribution outlet height of the second water distributor, volume height of water level in water leg is adjusted, and then adjust in first module Height of water level, adjust the zone of action of introduced earthworm and metabolism degree in first module.

To be easy for construction and compact-sized, it is preferred that before the first module, water leg and second unit are by same pond body After be separated, is provided with first module dividing plate and second unit dividing plate, the pond body antetheca and first unit in the pond body Be first module between dividing plate, be water leg between the first module dividing plate and second unit dividing plate, the second unit every It is second unit between plate and pond body rear wall.

The bottom of the first module dividing plate can be provided with the first water outlet through hole or first for forming first delivery port Outlet pipe, the first collector pipe that some through holes that catchment are distributed with side wall can be set in the first collection water layer, first is catchmented The water exit end of pipe passes through pond body rear wall, forms the first outlet pipe.

The bottom of the pond body rear wall can be provided with the second water outlet through hole or the second water outlet for forming second delivery port Pipe, the second collector pipe that some through holes that catchment are distributed with side wall can be set in the second collection water layer, by the second collector pipe Water exit end passes through pond body rear wall, forms the second outlet pipe.

The first thin inorganic filler layer can use fine sand layer, and the first thick inorganic filler layer can use stone Layer.

The first main packing layer can use it is following any one or it is any a variety of：Zeolite granular layer, Slag Layer and Anthracite coal measure, when using it is any a variety of when, used each layer uses formal distribution alternate up and down, above and below used each layer The order of distribution is random order.

Second organic pervious bed can use stalk slag blanket, such as reed slag blanket.

The second main packing layer can use it is following any one or it is any a variety of：Zeolite granular layer, Slag Layer and Anthracite coal measure, when using it is any a variety of when, used each layer uses formal distribution alternate up and down, above and below used each layer The order of distribution is random order.

The first collection water layer and the second collection water layer can use stone layer, and preferably use particle size layer distributed Sandwich construction, positioned at upper strata cobble-stone diameter be less than positioned at lower floor cobble-stone diameter.

The delivery port set-up mode of each collection water layer can be according to prior art or other suitable technologies, for example, can be Collect and corresponding collector pipe is set in water layer, some through holes are distributed with the side wall of collector pipe as collection water inlet, by collection water layer Water introduce in collector pipe, the corresponding delivery port that the external port of collector pipe is formed, corresponding pool wall access water leg can be passed through Or System drainage pipe, or the output channel of connection other forms.

Preferred kind is implanted with reed in the first module.

Preferred kind is implanted with wild rice stem in the second unit.

Occupation mode of the present utility model and have the beneficial effect that, pass through the first water distributor and access accessing pending water, accessing pending water From the cloth water out outflow on the first water distributor, successively by the first thin inorganic filler layer, the first thick inorganic filler layer and first Main packing layer, collect water layer into the first of first module bottom, the first water collected in water layer flows into collection through the first delivery port naturally Tank, import of the water through the second water distributor in water leg enters the second water distributor, through the cloth water out stream on the second water distributor Go out, successively by second organic pervious bed and the second main packing layer, second into second unit bottom collects water layer, then through the The delivery port of two collection water layers flows into System drainage pipe, is discharged from System drainage pipe.Accessing pending water realizes purification by said process, In addition to artificial swamp generally possessed various physics, chemistry, plant and the catharsis of microorganism, the utility model is also suitable Earthworm is inoculated with or introduced in first module and second unit, and the thin inorganic filler layer of first module and thick inorganic filler layer pass through Retained after a period of time operation between particle surface and gap and deposited the sludge containing organic matter, or before the use Artificial sludge for adding earthworm and depending on for existence etc., makes earthworm existence and the metabolism of inoculation, is first single by earthworm movement Member add air-water contact and oxygen dissolving, be subject to first module plantation reed root it is stronger secrete oxygen ability, further increase Contained dissolved oxygen content, enhances the effect of first module aerobic biochemical, including to ammonia nitrogen in big first module water body Nitration reaction, ammonia nitrogen is effectively removed after water body flows through first module, due to the nitrification of ammonia nitrogen in first module and is had The degraded of machine thing consumes a certain amount of dissolved oxygen, and content of oxygen dissolved in water reduces, and is formd for the denitrification of second unit Favourable anaerobic environment, earthworm crush digestion reed rod in second unit and on the one hand provide additional carbon for second unit, have Beneficial to the removal of denitrification process nitrate nitrogen；Another aspect reed rod decomposition and consumption oxygen, there is provided a kind of anaerobic environment, be more conducive to The progress of denitrification process.Earthworm is movable in two units, on the one hand can alleviate Wetland clogging problem；On the other hand pass through Earthworm digests, and microbial activity and quantity are improved largely；In addition, wormcast has the cellular knot of similar activated carbon Structure, for some compounds with foul odour such as lower fatty acid, mercaptan and hydrogen sulfide etc. and heavy metal with absorption Effect, efficiently reduces the secondary pollution problem such as peculiar smell existing for artificial swamp.

Matrix pores rate is increased by earthworm movement, effectively alleviates artificial swamp substrate clogging.

Oxygen content in earthworm increase first module Wetland Substrate, is advantageous to nitration reaction.

Earthworm crushes and digestion wetland plant stalk, and additional carbon, intensified anti-nitrated reaction are provided for second unit wetland.

Pass through plant, the selection of matrix, strengthened artificial wet land Nitrogen/Phosphorus Removal.

Through applicant's experimental verification, the utility model need not stop bed processing, can effectively delay during wetland is run Wetland clogging problem is solved, and strengthens wetland denitrification effect and improves overall level of purification.

Brief description of the drawings

Fig. 1 is the schematic diagram on the utility model main view direction；

Fig. 2 is the schematic diagram in the utility model overlook direction.

Embodiment

Referring to Fig. 1 and Fig. 2, this artificial wet land system can be divided into two processing units altogether, be divided into along water (flow) direction First module and second unit, water leg 9 is set between the two, and the volume ratio of first module and second unit is preferably 1:1, two The bottom of unit has certain depth displacement, second unit bottom 15cm low compared with first module bottom, passes through the cloth of second unit Water height, it is ensured that the unsaturated volume of first module, to ensure earthworm in first module upper strata normal activity, solution first module Wetland clogging problem, while oxygen is provided for first module, strengthen nitration reaction.

By overturning System drainage pipe 14 up or down（The different flip angles of System drainage pipe are represented by dashed line in Fig. 1 Degree or freeboard）, draining open height can be improved or reduce, adjustment earthworm 15 is in the up and down region of second unit, solution In artificial swamp matrix, the blockage problem in middle level, digestion of the earthworm to reed rod in second organic pervious bed 12 is second unit Additional carbon sources are provided, promote denitrification to carry out.

First module transplants reed 2, and planting density is 20 plants/m², second unit plant wild rice stem 10, planting density 20 Strain/m²。

First module filler is respectively the fine sand layer 3 of first module from top to bottom（Thickness 10cm）, stone layer 4（Thickness 10cm）, main packing layer（Using zeolite, slag or anthracite etc.）5（Thickness 60cm）, collection water layer 6（Thickness 10cm）With impervious barrier 8 （Thickness 3cm）, collection water layer is interior to set collector pipe 7, the delivery port of export mixes first of collector pipe 7, is connect in the top layer of first module Kind earthworm density is 120/m²。

Second unit filler is respectively the reed rod slag blanket 12 of second unit from top to bottom（Thickness 20cm）, main packing layer （Using zeolite, slag or anthracite etc.）13（Thickness 60cm）, collection water layer（Thickness 10cm）And impervious barrier（Thickness 3cm）, in It is 180/m that earthworm density is inoculated with the reed rod slag blanket of Unit two²。

Earthworm in Unit two can select the top layer kind compatriot love that life cycle is short, reproductive capacity is strong, can propagate artificially Win earthworm, Eisenia Foetida is also commonly used in ecological filter.In this artificial swamp earthworm 15 can the fine sand layer in first module, Stone layer is up and down, and providing oxygen as first module while Wetland clogging problem to alleviate first module promotes nitrification anti- Answer, highly adjusted according to rotatable drainpipe, allow earthworm in second unit it is upper, middle level is up and down, alleviate the The Wetland clogging problem of Unit two, while digest reed rod and provide additional carbon reinforcement anti-nitration reaction for second unit.

Sewage by the first water distributor 1 enter first module artificial swamp, uniformly flow through first module fine sand layer 3, Stone layer 4, packing layer 5, into collection water layer 6 after the collection of collector pipe 7, into water leg 9.Enter second by the UNICOM of water leg 9 Water distributor 11.There is provided oxygen by earthworm movement for first module, be subject to reed root it is stronger secrete oxygen ability, enhance first Nitration reaction of the unit to ammonia nitrogen.After water body flows through first module, ammonia nitrogen is effectively removed.The nitrification of ammonia nitrogen in first module Effect and the degraded of organic matter consume a certain amount of dissolved oxygen, make the sewage into system（Such as urban river water）Dissolved oxygen obtains one Fixed reduction, favourable anaerobic environment is formd for the denitrification of second unit.Water is from the second cloth at the top of second unit After water pipe 11 flows out, reed rod slag blanket 12 and main packing layer 13 are flowed successively, by can after the collector pipe in the second collection water layer is collected The System drainage pipe 14 of rotation discharges wet land system.On the one hand it is second unit that earthworm crushes digestion reed rod in second unit Additional carbon is provided, is advantageous to the removal of denitrification process nitrate nitrogen, another aspect reed rod decomposition and consumption oxygen, there is provided be a kind of The progress of anaerobic environment, more conducively denitrification process.Earthworm is movable in two units, on the one hand can alleviate Wetland clogging and ask Topic；On the other hand digested by earthworm, microbial activity and quantity are improved largely；In addition, wormcast has similar live The vesicular texture of property charcoal, for some compounds with foul odour such as lower fatty acid, mercaptan and hydrogen sulfide etc. with Suction-operated, used Eisenia Foetida have the characteristics that can artificial feeding, reproductive capacity it is strong, more low temperature resistant, succeeded at present In improvement applied to pollution environment.By introducing earthworm, this wet land system is set to stop bed processing, in the wetland runtime Between can alleviate Wetland clogging problem, and strengthen wetland denitrification effect.

In use, it can be monitored according to effluent index, the height of rotation regulation drainpipe 14, as nitrate nitrogen content has increased Added-time, water outlet height is suitably reduced, crushing reed rod slag by earthworm, on the one hand increase micro organism quantity, raising microorganism live Property, on the other hand more carbon sources are provided, so as to strengthen the nitration reaction in water body, reduce effluent nitrate-nitrogen content；When nitre state After nitrogen content reduces, freeboard is improved, prevents reed rod slag from being had an impact to second unit wetland, controlled organic in water outlet Pollution.Compared with the wet land system for being not added with earthworm, the wet land system of earthworm is added more effectively to alleviate Wetland clogging phenomenon.Identical In processing time, compared to the wet land system for adding earthworm, there are obvious sludgd deposition, water outlet in the wet land system wetland surface for being not added with earthworm Time of penetration extends, or even sees ponding on first module wetland surface；And the wet land system surface of earthworm is added not have any dirt Mud deposits, and under the activity of earthworm, the permeability of Wetland Substrate is good, and porosity is not significantly different with original state, There is no clogging completely.It is not added with after clogging occurs in earthworm wet land system, ammonia nitrogen concentration raises rapidly in water outlet, and adds The wet land system of earthworm is stable to the removal effect of ammonia nitrogen.

Requirement of the different phase of Microbial denitrogenation process to oxygen content has very big difference, and nitrification is an aerobic processes, Denitrification is then anaerobic processes, and it is not smooth that single oxygen environment also results in biological denitrification process in wetland, WGR too it is small then without Method provides enough oxygen, it is impossible to meet the needs of microorganism nitrification, and WGR is excessive, then destroys aerobic in wetland The alternating state of anaerobism so that microorganism autoxidation excessive velocities and then influence denitrification effect.It is typically suitable for nitration reaction DO should be higher than 2mg/L, and denitrifying DO should be controlled in 0.5mg/L.In first module, activity the entering for nitration reaction of earthworm Row provides more sufficient oxygen.Carbon source mainly has an impact to denitrification process, often nitrifies 1g nitrate nitrogens into N₂, it is necessary to consume Equivalent to 2.86g BOD₅Organic matter, and in the system carbon source in first module compared with horn of plenty, carbon source deficiency in second unit, Influence the progress of denitrification process, it is considered that BOD₅/ TN values are no more than 3 ~ 5 i.e. it is believed that carbon source deficiency.In second unit, lead to The progress of anti-nitration reaction can be effectively facilitated by crossing earthworm decomposition reed rod slag.

The bottom of the pond body can set impervious barrier, and the impervious barrier can be using the prior art of any suitable and its His possible technology.As a preferred embodiment, the impervious barrier can be followed successively by bentonite from inside to outside from basal plane Bed course, HDPE geomembranes, swelling protective soil layer, fine sand protective layer and terylene nonwoven geotextile layer, by the way that terylene nonwoven is geotechnological Cloth is set with above fine sand protective layer, contributing to provide the Global Macros effect to geomembrane, utilizes terylene nonwoven geotextiles Globality and toughness, support, homogenize external force/foreign object that gentle punching comes from above, while isolate impurity, reduce fine sand protective layer Pollution and biochemical reaction, can directly lay gravel layer, packing layer and collecting conduit, bentonite above this geotextiles Being provided with for protective layer is beneficial to prevent the damage of larger particles or sharp foreign matter to geomembrane in fine sand in actual implementation.Geomembrane Between seam crossing preferably welded using built-up welding, and be folded edge positioned at the geomembrane welding edge on upper strata, by upper strata geomembrane When being overlapped on lower floor's geomembrane, certain folding surplus capacity is reserved, flap portion is dug upwards and is folded in this geomembrane Main part on, the edge that is formed after folding, edge after folding carries out the built-up welding between lower floor's geomembrane, this Welding manner is not only convenient and easy, and can effectively ensure the intensity of welding region in practice, and is broken in the absence of edge Damage.

Some collection standpipes can be set in each unit, be distributed with the side wall of the collection standpipe some Collect vent hole, outside is enclosed with one or more layers nonmetallic silk screen, such as nylon mesh, the lower end extension of the collection standpipe The bottom of pond body, upper end are exposed, and the gas such as carbon dioxide and nitrogen that pond internal cause biochemical reaction is formed can be pressed internally Automatically into collecting standpipe and discharging under power effect, being wrapped in the screen mesh of outside can stop that particulate matter enters standpipe, Thus allow to use relatively large collection vent hole on standpipe, help to prevent through hole from blocking, increase the service life.

Bottom, middle part and top in each unit can be provided with online temperature monitor and/or pressure detecting instrument, institute The output access field control cabinet of online temperature monitor/or pressure detecting instrument is stated, is carried out by the display of field control cabinet It has been shown that, in order to understand and judge the biochemical reaction situation inside pond body, for example, temperature be influence one of bacterial activity it is important Environmental factor, and pressure then prompts in pond water-permeable and air permeable performance and thus biochemical reaction problem that may be present, field control The output of temperature/pressure detector can be accessed related according to setting related data processing circuit or device is needed in cabinet Data processing circuit or device, with the display processing needed for carrying out and other processing, for example, data processing circuit or device can be with Provided with warning output, in the temperature/pressure data fit alert if of detection, pass through the alarm lamp of warning output connection And/or alarm buzzer is alarmed.

Foot bridge longitudinally and/or laterally can be provided with above the pond body, the both ends of the foot bridge are fixedly mounted On pool wall or ground, thus, management and maintainer, which can be gone on bridge, closely to be checked and upkeep operation.

The utility model has following features：

In first module, earthworm movement, a kind of aerobic environment is provided for artificial swamp, strengthens the nitrifying process of ammonia nitrogen；

In second unit, reed rod crushing and digestion by earthworm, carries as external source filler for denitrifying bacteria For lasting carbon source, while the attachment place of microorganism is added, enhance system denitrification process；

By selecting different plants, in the stronger reed of first module plant oxygen carrying capacity, second unit is transplanted to nitrogen Phosphorus absorbability is adapted to the dissolved oxygen environmental requirement of each unit compared with strong but secrete oxygen wild rice stem limited in one's ability；

Excrement caused by earthworm has the loose and porous structure of similar activated carbon, to some organic compounds, heavy metal with And foul gas has suction-operated；

Through the postdigestive microorganism of earthworm, fertility is stronger, and activity is higher, and earthworm digestion also has certain to enzymatic activity Facilitation；

Earthworm can improve the penetrating power of artificial swamp, solve existing blockage problem during Wastewater Treatment by Constructed Wetlands；

Earthworm promotes the growth of Plants of Constructed Wetlands, prevents plant from degenerating, it is ensured that the stable operation of artificial swamp；

Earthworm extends the food chain in artificial swamp, adds the richness of food web, make artificial swamp structure and Function is more perfect, stably, be advantageous to efficiently, stably purify sewage；

The main filler of zeolite, slag, anthracite as wetland, consolidation system treatment effect.

Disclosed in the utility model it is each preferably with optional technological means, unless otherwise indicated and a preferred or optional skill Art means are outside the further restriction of another technological means, can form some different technical schemes in any combination.

Claims (10)

1. a kind of alleviate the artificial wet land system for blocking simultaneously strengthened denitrification, including first module and second unit using earthworm, respectively The unit uses the vertical subsurface flow mode of upper entering and lower leaving, and water distribution structure is located at the top of unit, and water collecting structure is located at unit Bottom, it is characterised in that the first thin inorganic filler layer is from top to bottom sequentially provided with the first module, first thick inorganic is filled out The bed of material, the first main packing layer and the first collection water layer, the first collection water layer form the water collecting structure of the first module, and described the The top of one thin inorganic filler layer is provided with the first water distributor, and first water distributor forms the cloth water-bound of the first module, From top to bottom it is sequentially provided with second organic pervious bed, the second main packing layer and the second collection water layer in the second unit, described the Two collection water layers form the water collecting structure of the second unit, and the top of second organic pervious bed is provided with the second water distributor, institute The cloth water-bound that the second water distributor forms the second unit is stated, water leg is provided between the first module and second unit, The first collection water layer is provided with the first delivery port, and the second collection water layer is provided with the second delivery port, first delivery port and institute The import for stating the second water distributor connects the water leg.

2. the system as claimed in claim 1, it is characterised in that second delivery port is connected with System drainage pipe, the system Drainpipe uses the adjustable structure of outlet height.

3. system as claimed in claim 2, it is characterised in that used between second delivery port and the System drainage pipe The movable connection method for allowing System drainage pipe to be spun upside down relative to the second delivery port is connected, and the System drainage pipe, which is provided with, to be used In the overturning and positioning device for fixing its position, or, the System drainage pipe is by drainpipe inlet segment and drainpipe water exit end structure Into using permission drainpipe water exit end relative on drainpipe inlet segment between the drainpipe inlet segment and drainpipe water exit end The movable connection method connection of lower upset, the drainpipe inlet segment are fixedly connected with second delivery port, the drainpipe Water exit end is provided with the overturning and positioning device for being used for fixing its position.

4. the system as claimed in claim 1, it is characterised in that second water distributor uses the structure that cloth water out is fixed, institute The height for stating the cloth water out of the second water distributor is for the bottom less than the described first thin inorganic filler layer and thick inorganic higher than first The bottom of packing layer, or for the top less than the first thick inorganic filler layer and higher than 3/4 height of the first main packing layer.

5. the system as claimed in claim 1, it is characterised in that second water distributor uses the adjustable knot of water distribution outlet height Structure.

6. the system as described in claim 1,2,3,4 or 5, it is characterised in that the first module, water leg and second unit By being separated before and after same pond body, first module dividing plate and second unit dividing plate, the pond body antetheca are provided with the pond body It is first module between first cell separators, is water leg between the first module dividing plate and second unit dividing plate, institute State between second unit dividing plate and pond body rear wall is second unit.

7. system as claimed in claim 6, it is characterised in that the bottom of the first module dividing plate, which is provided with, forms described first First water outlet through hole of delivery port or the first outlet pipe, the bottom of the pond body rear wall, which is provided with, forms the of second delivery port Two water outlet through holes or the second outlet pipe, second delivery port are connected with System drainage pipe.

8. the system as described in claim 1,2,3,4 or 5, it is characterised in that the first thin inorganic filler layer uses fine sand Layer, the first thick inorganic filler layer use stone layer, the first main packing layer using it is following any one or it is arbitrarily more Kind：Zeolite granular layer, Slag Layer and anthracite coal measure, when using any a variety of, used each layer uses shape alternate up and down Formula is distributed, and the order that used each layer is distributed up and down is random order.

9. the system as described in claim 1,2,3,4 or 5, it is characterised in that second organic pervious bed uses stalk slag Layer, the second main packing layer using it is following any one or it is any a variety of：Zeolite granular layer, Slag Layer and anthracite coal measure, When using it is any a variety of when, used each layer uses formal distribution alternate up and down, and used each layer is distributed suitable up and down Sequence is random order.

10. the system as described in claim 1,2,3,4 or 5, it is characterised in that in the first module and second unit respectively Kind is implanted with reed and wild rice stem.