CN207552116U - Strengthen the multistage Rain Garden of runoff pollution removal in a kind of sponge city - Google Patents

Strengthen the multistage Rain Garden of runoff pollution removal in a kind of sponge city Download PDF

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Publication number
CN207552116U
CN207552116U CN201721432172.1U CN201721432172U CN207552116U CN 207552116 U CN207552116 U CN 207552116U CN 201721432172 U CN201721432172 U CN 201721432172U CN 207552116 U CN207552116 U CN 207552116U
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rain garden
garden
layer
drainpipe
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唐宁远
李显涛
汪良珠
阮键华
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Hunan Dachen environmental protection Co.,Ltd.
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Hunan Dachen Environmental Protection Technology Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/108Rainwater harvesting

Abstract

Strengthen the multistage Rain Garden of runoff pollution removal in a kind of sponge city, including level-one Rain Garden and two level Rain Garden, level-one drainpipe is equipped in level-one Rain Garden, the water intake end of level-one drainpipe is located at the bottom of level-one Rain Garden, Municipal secondary effluent pipe is equipped in two level Rain Garden, the water intake end of Municipal secondary effluent pipe is located at the bottom of two level Rain Garden;The water inlet of level-one Rain Garden is connected with catch basin, and the water outlet of level-one drainpipe is connected with the water inlet of two level Rain Garden, and the water outlet height of level-one drainpipe is higher than the water inlet of two level Rain Garden.Multistep treatment is carried out to pollutant using multistage Rain Garden, Rain Gardens at different levels are set as to upper strata is oxygen-enriched, environment of lower floor's hypoxic/anaerobic, aerobic plus hypoxic/anaerobic processing is repeatedly carried out to pollutant, to be effectively removed to pollutant.

Description

Strengthen the multistage Rain Garden of runoff pollution removal in a kind of sponge city
Technical field
The utility model is related to a kind of Rain Garden, the multistage rain of runoff pollution removal is strengthened in especially a kind of sponge city Spray garden belongs to sponge urban construction technical field.
Background technology
During rainy season set, urban waterlogging can all occur in many cities in the whole nation, bring inconvenience to civil plantation, even It can cause the loss of lives and properties;Rainfall simulator erosion impervious surface makes to carry a large amount of pollutant for example particle in rainfall runoff Object, nitrogen, phosphorus, heavy metal, agrochemical are directly discharged into urban water-body, destroy Urban Water Environment.In view of the above-mentioned problems, country carries Go out this completely new urban construction theory of sponge city.Sponge city requirement city have to rainwater ooze, be stagnant, store, is net, use, row Function.
Rain Garden is that the scrobicula greenery patches of self-assembling formation or hand digging and sponge urban construction technical manual are recommended Rainfall runoff control technology, derived from rainwater sand filtration and infiltration ditch technology, incorporate the functions of two kinds of technologies, rainwater flows through delay During facility, through permeating, precipitating, crown_interception, runoff water is cut in, pollutant is preferably gone in runoff It removes, part rainfall runoff gradually penetrates into soil, recharging groundwater.Using Rain Garden, the water that can restore nature again follows Loop system improves Urban Water Environment, can also improve city water resource allotment.It is set relative to the high conventional municipal draining of construction cost It applies, rainfall runoff is handled using Rain Garden, be more economical rational scheme, and can also beautifying city, purification air.
At present, the design of most domestic Rain Garden mainly considers its landscape effect and the water rate control of rainfall runoff is imitated Fruit, and weaken catharsis, there are effluent nitrate-nitrogen concentration height, the problem of total nitrogen is difficult to reduce.To PAHs in rainfall runoff, The processing of agrochemical " three cause " pollutant difficult to degrade, also lacks and is effectively directed to measure.For above deficiency, it is desirable to provide It is a kind of to effectively remove Conventional pollution for example nitrogen, phosphorus etc. and a small amount of hazardous contaminant difficult to degrade for example agrochemical rain Spray garden.
By being retrieved to domestic patent, discovery has related patents, is exemplified below:
Application number CN201610322138.2, entitled " the existing residential quarter multistage Rain Garden osmosis system of the continuous formula of string " Application for a patent for invention disclose a kind of continuous existing residential quarter multistage Rain Garden osmosis system of formula of string, it includes:Multiple rooms Poppyhead garden, multiple waterspouts, multiple first order Rain Gardens, the low gesture of polylith are formed a team central greenery patches, multiple second level Rain Gardens, The elevation of first order Rain Garden is higher than the elevation of second level Rain Garden, and the elevation of the second level Rain Garden is higher than the The elevation of three-level Rain Garden.Advantages of the present invention:Pass through the osmosis plants such as multistage Rain Garden, Low elevation greenbelt, Glassed swale Rainwater is infiltrated into underground on the spot, so as to supplemented with groundwater resources;Rain infiltration underground, reduces surface runoff, so as to alleviate The problem of flood, soil plays purification function during rain infiltration;Low elevation greenbelt, Glassed swale, Rain Garden Rainfall runoff is all purified.These purification functions can reduce the pollution problem of surface drainage.
Although above-mentioned application and a kind of multistage Rain Garden, it is for integrally carry out that rainwater stores only for residential quarter System, floor space is larger, is vulnerable to the limitation of field of employment.
Application number CN201710419404.8, the patent of invention Shen of entitled " a kind of runoff treatment system and method " A kind of runoff treatment system and method please be disclose, the system comprises:Collection device, for the earth's surface diameter that converges Stream;Primary filter, for carrying out primary filter to the rainwash;At least one second grade soil filter device, is used for The rainwash after primary filter is collected using pipeline, secondary filtration is carried out to the rainwash;It and will be after secondary filtration The rainwash is discharged into river;In this way, the processing system can be arranged over long distances along riverbank side, rainwash is carried out Multistage is depolluted after processing, and water body is discharged into river after the pollutants such as suspended matter, COD, nitrogen, phosphorus carried in removal rainwash In, not only will not polluted river, but also the load of sewage disposal system will not be increased, the draining of urban pipe network will not be influenced;It and can To plant urban landscape plant at least one second grade soil filter device, beautify the environment.
Although above-mentioned patent application is handled rainwash using multistage means, treatment effect is still not enough managed Think, need to improve.
Invention content
The utility model, which lacks the processing of pollutant in rainfall runoff for current Rain Garden, is effectively directed to measure The problem of propose the multistage Rain Garden that runoff pollution removal is strengthened in a kind of sponge city, to effectively remove Conventional pollution example Such as nitrogen, phosphorus and a small amount of hazardous contaminant difficult to degrade for example agrochemical.
Used technological means is the utility model in order to solve the above problem:Strengthen runoff pollution and go in a kind of sponge city Including level-one Rain Garden and two level Rain Garden, level-one drainpipe is equipped in level-one Rain Garden for the multistage Rain Garden removed, The water intake end of level-one drainpipe is located at the bottom of level-one Rain Garden, and Municipal secondary effluent pipe, two level row are equipped in two level Rain Garden The water intake end of water pipe is located at the bottom of two level Rain Garden;The water inlet of level-one Rain Garden is connected with catch basin, level-one draining The water outlet of pipe is connected with the water inlet of two level Rain Garden, and the water outlet height of level-one drainpipe is higher than two level Rain Garden Water inlet.
Further, level-one Rain Garden sets gradually coating, planting soil layer, layer of sand and gravel layer from top to down, and one The water intake end of grade drainpipe is located at the gravel layer bottom of level-one Rain Garden, i.e., positioned at the gravel layer bottom of level-one Rain Garden Level-one drainpipe on be provided with drainage through-hole as water intake end;Two level Rain Garden sets gradually coating, kind from top to down Soil layer, permeable geotextiles and gravel layer, the water intake end of Municipal secondary effluent pipe is planted to be located at the gravel layer segment of two level Rain Garden, that is, exist Drainage through-hole is provided on the Municipal secondary effluent pipe of the gravel layer bottom of two level Rain Garden as water intake end.
Further, the waterproof cloth for the two to be separated is equipped between level-one Rain Garden and two level Rain Garden.
Further, the structure further includes three-level Rain Garden, and the top of wherein three-level Rain Garden is divided into oxygen-enriched portion Divide, lower part is divided into hypoxic/anaerobic part;The water outlet of Municipal secondary effluent pipe is connected with the water inlet of three-level Rain Garden, and two level The water outlet of drainpipe is higher than the water inlet of three-level Rain Garden;Three-level Rain Garden sets gradually coating, kind from top to down Soil layer, layer of sand and gravel layer are planted, is equipped with three-level drainpipe in three-level Rain Garden, the water intake end of three-level drainpipe is located at three-level rain The bottom of spray garden gravel layer is provided with drainage on the three-level drainpipe positioned at the gravel layer bottom of three-level Rain Garden and leads to Hole is as water intake end.
Further, the waterproof cloth for the two to be separated is equipped between two level Rain Garden and three-level Rain Garden.
Further, overburden cover 50mm-100mm, filler are for bark or decomposed fibrous material, packing material size 40-60mm。
Further, planting soil layer filler be rough sand, table soil, litter compost or decomposed sawdust, thickness 200-400mm.
Further, the mass content of each ingredient of planting soil layer filler is 40-60% rough sand, 30-40% tables soil, 10-20% are fallen Leaf compost or decomposed sawdust.
Further, layer of sand filler be middle sand, grain size 0.3-1.5mm, thickness 60-120mm.
Further, gravel layer is 1 by volume ratio:1 gravel and sawdust or a scrap of paper mixing composition, thickness are not less than 300mm。
Further, gravel layer sawdust or a scrap of paper grain size are 10-20mm;Gravel layer from top to bottom for it is thin, in, coarse gravel Layer, the particle size range of each layer gravel is respectively 5-10mm, 10-30mm, 30-60mm, and thickness is followed successively by 50-150mm, 50-200mm And 100-300mm.
Further, water inlet is provided with scree, and the particle size range of rubble used in scree is 30-60mm.
Further, the aperture of drainage through-hole is 5-15mm, and is enclosed on the outside of the drainpipe at drainage through-hole place Permeable geotextiles.
Further, the drain pipe diameter at drainage through-hole place is 100-150mm.
Further, interconnected overflow pipe is additionally provided in multistage Rain Garden, the water intake end of overflow pipe is located at ground Top, water outlet are connected at municipal storm sewer or rainwater-collecting.
Further, the water intake end head cover cover rim of overflow pipe is provided with grizzly bar.
Further, diameter of overflow pipe 100-150mm, water intake end are higher than coating 150-200mm.
The beneficial effects of the utility model are:
1. the utility model carries out multistep treatment using multistage Rain Garden to the pollutant in runoff, by rainwater at different levels Garden is set as that upper strata is oxygen-enriched, environment of lower floor's hypoxic/anaerobic, and aerobic plus hypoxic/anaerobic processing is repeatedly carried out to pollutant, with Pollutant is effectively removed.
2. the water inlet of the utility model drainpipe is divided into the gravel layer bottom of Rain Garden hypoxic/anaerobics at different levels, make Rainwater enters back into drainpipe after the abundant processing of aerobic and hypoxic/anaerobic is all carried out in every level-one Rain Garden, with from upper one Grade Rain Garden flows into the removal processing that next stage Rain Garden continues pollutant.
Description of the drawings
Fig. 1 is the floor map of the utility model embodiment one.
Fig. 2 is the schematic cross-sectional view of the utility model embodiment one.
Fig. 3 is the floor map of the utility model embodiment two.
Fig. 4 is the schematic cross-sectional view of the utility model embodiment two.
In figure:11. level-one Rain Garden, 12. two level Rain Gardens, 13. three-level Rain Gardens, 21. coatings, 22. kinds Plant soil layer, 23. layers of sand, 24. gravel layers, 3. catch basins, 4. screes, 5. drainpipes, 51. level-one drainpipes, 52. Municipal secondary effluents Pipe, 53. three-level drainpipes, 54. drainage through-holes, 6. overflow pipes.
Specific embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings.
Embodiment one
As shown in Figure 1, a kind of sponge city multistage Rain Garden strengthens the structure of runoff pollution removal, including level-one rainwater Garden 11 and two level Rain Garden 12, the top of wherein level-one Rain Garden 11 is divided into oxygen-rich fraction, lower part is divided into hypoxic/anaerobic Part, two level Rain Garden 12 are mainly oxygen-rich fraction;This level-one Rain Garden 11 is located at the center of entire multistage Rain Garden, Two level Rain Garden 12 is surrounded on the periphery of level-one Rain Garden 11, and the relative altitude of level-one Rain Garden 11 is higher than two level rainwater The height in garden 12, level-one drainpipe 51 is equipped in level-one Rain Garden 11, and the water intake end of level-one drainpipe 51 is located at level-one rain The bottom in spray garden 11, Municipal secondary effluent pipe 52 is equipped in two level Rain Garden 12, and the water intake end of Municipal secondary effluent pipe 52 is located at two level The bottom of Rain Garden 12;The water inlet of level-one Rain Garden 11 is connected with catch basin 3, the water outlet of level-one drainpipe 51 and two The water inlet connection of grade Rain Garden 12, and the water outlet height of level-one drainpipe 52 is higher than the water inlet of two level Rain Garden 12 Mouthful.The water intake end of drainpipes 5 at different levels is arranged on to the bottom of Rain Gardens at different levels, makes rainfall runoff in gardens at different levels by place It enters back into drainpipe 5 after reason to flow out, to carry out rainfall runoff the maximum processing that depollutes;The water outlet of level-one drainpipe 51 with The water inlet connection of two level Rain Garden 12, and the water outlet height of level-one drainpipe 51 is higher than the water inlet of two level Rain Garden 12 Mouthful, the multistep treatment for rainfall runoff provides condition, rainfall runoff is made to carry out the processing that depollutes in the Rain Garden of upper level After enter back into next stage Rain Garden and continue the processing that depollutes.
Level-one Rain Garden 11 sets gradually coating 21, planting soil layer 22, layer of sand 23 and gravel layer 24 from top to down, and one The water intake end of grade drainpipe 51 is located at 24 bottom of gravel layer of level-one Rain Garden 11, i.e., in the gravel positioned at level-one Rain Garden 11 Drainage through-hole 54 is provided on the level-one drainpipe 51 of 24 bottom of rock layers as water intake end, and the water outlet of level-one drainpipe 51 is high Degree is highly made gravel layer 24 form waterflooding area with guaranteed water level and remains a hypoxic/anaerobic environment higher than layer of sand 23;Two level rain Spray garden 12 sets gradually coating 21, planting soil layer 22, permeable geotextiles 23 and gravel layer 24, Municipal secondary effluent pipe from top to down 52 water intake end is located at 24 part of gravel layer of two level Rain Garden 12, i.e., positioned at 24 bottom of gravel layer of two level Rain Garden 12 Drainage through-hole 54 is provided on the Municipal secondary effluent pipe 52 in portion as water intake end.Rain Gardens at different levels are according to coating from top to down 21st, the setting of planting soil layer 22, layer of sand 23 and gravel layer 24 both provided a suitable living environment for the growth of vegetation, Be conducive to the existence of microorganism, to remove the pollutant in rainfall runoff.
The waterproof cloth for the two to be separated is equipped between level-one Rain Garden 11 and two level Rain Garden 12.Avoid level-one The arbitrary circulation of substance between Rain Garden 11 and two level Rain Garden 12 forms an orderly multistage environment.
21 thickness of coating be 50mm-100mm, filler be bark or decomposed fibrous material, packing material size 40- 60mm.Coating 21 using bark or decomposed fibrous material as filler can both keep the humidity of soil, avoid topsoil It is hardened and permeance property is caused to reduce, and built a microbial environment in Soil Interface, have and utilize rainwater on road surface runoff The degradation of the organic matters such as middle grease, while additionally aid the erosion for reducing rainfall runoff to upper soll layer.
22 filler of planting soil layer is rough sand, table soil, litter compost or decomposed sawdust, thickness 200-400mm.Planting soil layer 22 provide habitat for plant, are plant absorption, filling adsorption, chemical precipitation and microbial degradation organic matter, heavy metal, nitrogen, phosphorus Place is provided, while also there is preferable filtration with other pollutants, can remove the particulate matter in rainfall runoff and suction Be attached to other polluters on particulate matter, the thickness of planting soil layer 22 is determined according to the vegetation planted, shallow rooted plant selection compared with Shallow planting soil layer 22, deep rooting plant should then select thicker planting soil layer 22.
The mass content of each ingredient of 22 filler of planting soil layer is 40-60% rough sand, 30-40% tables soil, 10-20% litter composts Or decomposed sawdust.Wherein rough sand can improve the permeance property of planting soil layer, and the organic materials such as litter compost or decomposed sawdust can change The effects that being apt to planting soil Pore structure in soil, moisture holding capacity, promoting the enrichment of microorganism.
23 filler of layer of sand be middle sand, grain size 0.3-1.5mm, thickness 60-120mm.Layer of sand 23 is transition zone, prevents from planting It plants native small particles object and is directly entered gravel layer 24, block 24 hole of gravel layer.
Gravel layer 24 is 1 by volume ratio:1 gravel and sawdust or a scrap of paper mixing composition, the gravel of level-one Rain Garden 11 24 thickness of rock layers is 500mm, and 24 thickness of gravel layer of two level Rain Garden 12 is 300mm.24 filler of gravel layer uses organic matter The sawdust or a scrap of paper of matter as electron donor in denitrification, promote the denitrification of nitrate nitrogen to remove.
24 sawdust of gravel layer or a scrap of paper grain size are 10-20mm;Gravel layer 24 from top to bottom for it is thin, in, cobble rock layers, respectively The particle size range of layer gravel is respectively 5-10mm, 10-30mm, 30-60mm.24 each grain size of gravel layer of level-one Rain Garden 11 Gravel thickness is followed successively by 150mm, 200mm and 250mm, and the gravel thickness of 24 each grain size of gravel layer of two level Rain Garden 12 is successively For 100mm, 100mm and 150mm.
Water inlet is provided with scree 4, and the particle size range of rubble used in scree 4 is 30-60mm.Water inlet it is broken Clitter 4 is for consuming, the energy of dispersing water flow, prevents rainfall runoff to 22 surface layer of sewage garden coating 21 and planting soil layer It washes away, while preliminary filtering function is played to the large particulate matter in rainfall runoff.
The aperture of drainage through-hole 54 is 5-15mm, and where drainage through-hole 54 at drainpipe 5 outside be enclosed with it is permeable Geotextiles.
5 caliber of drainpipe at where drainage through-hole 54 is 100-150mm.
Interconnected overflow pipe 6 is additionally provided in multistage Rain Garden, the water intake end side of resting on the ground of overflow pipe 6 goes out The mouth of a river is connected at municipal storm sewer or rainwater-collecting.In the present embodiment, level-one Rain Garden 11 and two level Rain Garden 12 Overflow pipe 6 be connected directly to Municipal secondary effluent pipe 52, Municipal secondary effluent pipe 52 is connected to municipal storm sewer or rainwater-collecting again Place.
The water intake end head cover cover rim of overflow pipe 6 is provided with grizzly bar.
6 caliber 100-150mm of overflow pipe, water intake end are higher than coating 150-200mm.
Water-in and water-out water treatment and treatment effect in the present embodiment is as shown in the table:
Water quality index Water inlet Water outlet Removal rate(%)
SS(mg/L) 267±33 11±8 95.9±3.0
COD(mg/L) 205±43 15±9 92.7±4.4
NH4 +-N(mg/L) 6.8±2.7 0.3±0.4 95.6±5.9
TN(mg/L) 9.4±3.5 0.6±0.8 93.6±8.5
TP(mg/L) 1.7±0.5 0.1±0.1 94.1±5.9
O, O- dimethyl-S-(N- methylcarbamoyl methyl)Phosphorodithioate(Rogor)(µg/L) 719±67 28±47 96.1±6.5
Daconil M(Bravo)(µg/L) 558±84 15±32 97.3±5.7
Total zinc (μ g/L)) 638±104 23±47 96.4±7.4
Total nickel (μ g/L) 258±65 14±23 94.6±8.9
Total lead (μ g/L) 385±84 17±28 95.6±7.3
Embodiment two
The present embodiment and above-described embodiment the difference lies in:This multistage Rain Garden further includes three-level Rain Garden 13, it is suitble to be arranged on riverbank or knob etc. according to topography, wherein level-one Rain Garden 11 and two level Rain Garden 12 Upper part is that oxygen-rich fraction, lower part are hypoxic/anaerobic part, and three-level Rain Garden 13 is mainly oxygen-rich fraction;Level-one Rain Garden 11, two level Rain Garden 12 are disposed adjacent successively from high to low with three-level Rain Garden 13, Municipal secondary effluent pipe 52 Water outlet is connected with the water inlet of three-level Rain Garden 13, and the water outlet of Municipal secondary effluent pipe 52 is higher than three-level Rain Garden 13 Water inlet, while the water outlet height of Municipal secondary effluent pipe 52 is higher than the layer of sand 23 of two level Rain Garden 12, with guaranteed water level height Gravel layer 24 is made to form waterflooding area and remains a hypoxic/anaerobic environment;Three-level Rain Garden 13 is set gradually from top to down to be covered Cap rock 21, planting soil layer 22, layer of sand 23 and gravel layer 24 are equipped with three-level drainpipe 53, three-level draining in three-level Rain Garden 13 The water intake end of pipe 53 is located at the bottom of 13 gravel layer 24 of three-level Rain Garden, i.e., in the gravel layer 24 positioned at three-level Rain Garden 13 Drainage through-hole 54 is provided on the three-level drainpipe 53 of bottom as water intake end.
The waterproof cloth for the two to be separated is equipped between two level Rain Garden 12 and three-level Rain Garden 13.Avoid two level The arbitrary circulation of substance between Rain Garden 12 and three-level Rain Garden 13 forms an orderly multistage environment.
In the present embodiment, the overflow pipe 6 of level-one Rain Garden 11 and the overflow pipe 6 of two level Rain Garden 12 are interconnected, It is flowed directly at municipal storm sewer or rainwater-collecting after finally importing the drainpipe 5 of three-level Rain Garden 13.
The multistage Rain Garden of runoff pollution removal is strengthened in a kind of sponge city of the utility model, utilizes multistage Rain Garden Multistep treatment is carried out to the pollutant in rainwater, specially:Rainwater flows into two level after catch basin 3 flows into level-one Rain Garden 11 Rain Garden 12, organic nitrogen, ammonia nitrogen in rainwater after 11 advanced row Aerobic Process for Treatment of level-one Rain Garden is changed into nitrate nitrogen again It carries out hypoxic/anaerobic processing and is changed into N2Discharge, untreated complete organic nitrogen, ammonia nitrogen enter two level Rain Garden 12, in two level 12 advanced row Aerobic Process for Treatment of Rain Garden be changed into after nitrate nitrogen carry out again hypoxic/anaerobic processing be changed into N2Discharge;In rainwater Insecticide be changed into after small-molecule substance after level-one Rain Garden 11 carries out hypoxic/anaerobic processing and enter two level Rain Garden 12 progress Aerobic Process for Treatment are transformed into free of contamination substance.In the removal process of pollutant, the process infiltrated with rainfall runoff, Most organic nitrogens or ammonia nitrogen be attracted in the surface layer filler of Rain Garden in i.e. planting soil layer 22 carry out take it is longer Ammonia Nitrification reacts, and the nitrate nitrogen in rainfall runoff(From two aspects, first, the rainfall runoff of this rainfall;Second is that The ammonia nitrogen or organic nitrogen adsorbed in filler is converted into nitrate nitrogen in no rain period by nitrobacteria, this nitrate nitrogen mobility is very strong, Also it is not adsorbed by filler, infiltrating runoff with this rinses)It goes to carry out taking shorter denitrification also in hypoxic/anaerobic It is former.
Specifically, rainwater flows into the gravel of 11 lower floor of level-one Rain Garden from the planting soil layer 22 on 11 upper strata of level-one Rain Garden Rock layers 24 enter the level-one drainpipe 51 of level-one Rain Garden 11 through gravel layer 24, and the water outlet through level-one drainpipe 51 flows into Two level Rain Garden 12, the planting soil layer 22 through 12 upper strata of two level Rain Garden flow into the gravel layer of 12 lower floor of two level Rain Garden 24, enter the Municipal secondary effluent pipe 52 of two level Rain Garden 12 in gravel layer 24;Organic nitrogen, ammonia nitrogen in rainwater are spent in level-one rainwater The planting soil layer 22 on 11 upper strata of garden enters the gravel layer 25 of 11 lower floor of level-one Rain Garden after Aerobic Process for Treatment is changed into nitrate nitrogen It carries out hypoxic/anaerobic denitrification and is changed into N2Discharge, untreated complete organic nitrogen, ammonia nitrogen enter two level Rain Garden 12, two The planting soil layer 22 on 12 upper strata of grade Rain Garden is after Aerobic Process for Treatment is changed into nitrate nitrogen into 12 lower floor of two level Rain Garden Gravel layer 24 carries out hypoxic/anaerobic denitrification and is changed into N2Discharge;Insecticide in rainwater is in 11 lower floor of level-one Rain Garden Gravel layer 24 is handled through hypoxic/anaerobic is changed into small-molecule substance, then in the planting soil layer 22 on 12 upper strata of two level Rain Garden Aerobic oxidation is free of contamination substance.
Processed rainwater flows into three-level Rain Garden 13 from the water outlet of Municipal secondary effluent pipe 52, still untreated complete organic The planting soil layer 22 of nitrogen, ammonia nitrogen on 13 upper strata of three-level Rain Garden enters three-level rainwater after Aerobic Process for Treatment is changed into nitrate nitrogen and spends The gravel layer 24 of 13 lower floor of garden carries out hypoxic/anaerobic denitrification and is changed into N2Discharge;Untreated complete insecticide is in two level rainwater The gravel layer 24 of 12 lower floor of garden is handled through hypoxic/anaerobic is changed into small-molecule substance, then on 13 upper strata of three-level Rain Garden 22 aerobic oxidation of planting soil layer be free of contamination substance.
Using multistage Rain Garden, multi task process is carried out to the pollutant in rainfall runoff, it is thorough to be carried out to pollutant Removal.
It can be seen that the utility model has the advantages that:
1. the utility model carries out multistep treatment using multistage Rain Garden to the pollutant in runoff, by rainwater at different levels Garden is set as that upper strata is oxygen-enriched, environment of lower floor's hypoxic/anaerobic, and aerobic plus hypoxic/anaerobic processing is repeatedly carried out to pollutant, with Pollutant is effectively removed.
2. the water inlet of the utility model drainpipe is divided into the gravel layer bottom of Rain Garden hypoxic/anaerobics at different levels, make Rainwater enters back into drainpipe after the abundant processing of aerobic and hypoxic/anaerobic is all carried out in every level-one Rain Garden, with from upper one Grade Rain Garden flows into the removal processing that next stage Rain Garden continues pollutant.
Above example is only for illustration of the utility model rather than limitation to the utility model, related technical field Technical staff in the case where not departing from the spirit and scope of the utility model, can also make a variety of changes or convert, because This all equivalent technical solution should also belong to the scope of protection of the utility model, and the scope of protection of the utility model should be by Each claim limits.Such as can also be according to the pollution condition of runoff and region situation, outer in three-level Rain Garden is set again Level Four Rain Garden or Pyatyi Rain Garden are even more.

Claims (10)

1. the multistage Rain Garden of runoff pollution removal is strengthened in a kind of sponge city, it is characterised in that:Including level-one Rain Garden (11)With two level Rain Garden(12), level-one Rain Garden(11)In be equipped with level-one drainpipe(51), level-one drainpipe(51)'s Water intake end is located at level-one Rain Garden(11)Bottom, two level Rain Garden(12)In be equipped with Municipal secondary effluent pipe(52), two level row Water pipe(52)Water intake end be located at two level Rain Garden(12)Bottom;Level-one Rain Garden(11)Water inlet and catch basin (3)Connection, level-one drainpipe(51)Water outlet and two level Rain Garden(12)Water inlet connection, and level-one drainpipe(51) Water outlet height be higher than two level Rain Garden(12)Water inlet.
2. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as described in claim 1, it is characterised in that:It is described Level-one Rain Garden(11)Coating is set gradually from top to down(21), planting soil layer(22), layer of sand(23)And gravel layer(24), Level-one drainpipe(51)Water intake end be located at level-one Rain Garden(11)Gravel layer(24)Bottom is spent positioned at level-one rainwater Garden(11)Gravel layer(24)The level-one drainpipe of bottom(51)On be provided with drainage through-hole(54)As water intake end;Two level rainwater Garden(12)Coating is set gradually from top to down(21), planting soil layer(22), layer of sand(23)And gravel layer(24), Municipal secondary effluent Pipe(52)Water intake end be located at two level Rain Garden(12)Gravel layer(24)Part, i.e., positioned at two level Rain Garden(12)'s Gravel layer(24)The Municipal secondary effluent pipe of bottom(52)On be provided with drainage through-hole(54)As water intake end.
3. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as described in claim 1, it is characterised in that:It is described Multistage Rain Garden further includes three-level Rain Garden(13), Municipal secondary effluent pipe(52)Water outlet and three-level Rain Garden(13)'s Water inlet connects, and Municipal secondary effluent pipe(52)Water outlet be higher than three-level Rain Garden(13)Water inlet;Three-level Rain Garden (13)Coating is set gradually from top to down(21), planting soil layer(22), layer of sand(23)And gravel layer(24), three-level Rain Garden (13)In be equipped with three-level drainpipe(53), three-level drainpipe(53)Water intake end be located at three-level Rain Garden(13)Gravel layer(24) Bottom, i.e., positioned at three-level Rain Garden(13)Gravel layer(24)The three-level drainpipe of bottom(53)On be provided with drainage and lead to Hole(54)As water intake end.
4. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The coating(21)Thickness is 50mm-100mm, and filler is bark or decomposed fibrous material, packing material size 40-60mm.
5. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The planting soil layer(22)Filler is rough sand, table soil, litter compost or decomposed sawdust, thickness 200-400mm;
The planting soil layer(22)The mass content of each ingredient of filler is 40-60% rough sand, 30-40% tables soil, 10-20% fallen leaves heaps Fertile or decomposed sawdust.
6. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The layer of sand(23)Filler be middle sand, grain size 0.3-1.5mm, thickness 60-120mm.
7. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The gravel layer(24)It is 1 by volume ratio:1 gravel and sawdust or a scrap of paper mixing composition, thickness are not less than 300mm;
The gravel layer(24)Sawdust or a scrap of paper grain size are 10-20mm;Gravel layer(24)From top to bottom for it is thin, in, coarse gravel Layer, the particle size range of each layer gravel is respectively 5-10mm, 10-30mm, 30-60mm, and thickness is followed successively by 50-150mm, 50-200mm And 100-300mm.
8. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The water inlet is provided with scree(4), scree(4)The particle size range of rubble used is 30-60mm.
9. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as claimed in claim 2 or claim 3, it is characterised in that: The drainage through-hole(54)Aperture for 5-15mm, and drainage through-hole(54)Drainpipe at place(5)Outside be enclosed with Water geotextiles;The drainage through-hole(54)Drainpipe at place(5)Caliber is 100-150mm.
10. the multistage Rain Garden of runoff pollution removal is strengthened in sponge city as described in claim 1, it is characterised in that:Institute It states and interconnected overflow pipe is additionally provided in multistage Rain Garden(6), overflow pipe(6)The water intake end side of resting on the ground, water outlet Mouth is connected at municipal storm sewer or rainwater-collecting;
The overflow pipe(6)Water intake end head cover cover rim be provided with grizzly bar;
The overflow pipe(6)Caliber 100-150mm, water intake end are higher than coating 150-200mm.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110206094A (en) * 2019-06-04 2019-09-06 徐州工程学院 A kind of Rain Garden suitable for monsoon weather
CN110644686A (en) * 2019-09-27 2020-01-03 浙江万瑞建设有限公司 Roof greening structure and construction method
CN111648438A (en) * 2020-07-07 2020-09-11 汇绿园林建设发展有限公司 Rainwater garden for city park

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110206094A (en) * 2019-06-04 2019-09-06 徐州工程学院 A kind of Rain Garden suitable for monsoon weather
CN110644686A (en) * 2019-09-27 2020-01-03 浙江万瑞建设有限公司 Roof greening structure and construction method
CN111648438A (en) * 2020-07-07 2020-09-11 汇绿园林建设发展有限公司 Rainwater garden for city park

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