CN108585212A - A kind of gabion construction method of drowned flow artificial wet land - Google Patents
A kind of gabion construction method of drowned flow artificial wet land Download PDFInfo
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- CN108585212A CN108585212A CN201810733425.1A CN201810733425A CN108585212A CN 108585212 A CN108585212 A CN 108585212A CN 201810733425 A CN201810733425 A CN 201810733425A CN 108585212 A CN108585212 A CN 108585212A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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Abstract
A kind of gabion construction method of drowned flow artificial wet land, including following procedure：（1）Build gabion module：Gabion module is made of purse seine and movable spacer screen, purse seine is surrounded by four surface side nets, movable spacer screen is arranged in the bottom of purse seine, purse seine upper opening, the intersection setting of two adjacent surfaces side net vertically pulls muscle, per surface side, the upper end of net is all connected with upper layer girt, per surface side, the lower end of net is all connected with bottom girt, connect intermediate girt between upper layer girt and bottom girt on the net per surface side, twice are at least arranged in intermediate girt, graduation indication of the girt as filler, the distance between girt are the height of every layer of filler；（2）The laying of gabion module and filler filling：First by the purse seine pull-up of the gabion module of folding, then in purse seine bottom placement spacer screen；The discharge of gabion module is carried out from bottom of slope toward top of the slope direction, and the filler in gabion module is layered filling from the bottom to top.It is deformed upon invention prevents gabion and gap occurs in gabion module, improve engineering construction efficiency, ensure that the stability of wetland operation, be laid with without artificial, it can do mechanization operation.
Description
Technical field
The present invention relates to a kind of construction methods for drowned flow artificial wet land, belong to Artificial Wetland Techniques field.
Background technology
After Sewage Disposal is handled, the water outlet COD contents for meeting sewage discharge primary standard are also up to sewage
100mg/L is far longer than the numerical value (COD≤20mg/L) of Drinking Water water head site secondary standard.And artificial swamp ecosystem
System is widely used in handling domestic sewage in rural areas, mining industry waste water, urban storm runoff pollution, sewage treatment plant tail water in recent years
Fields, the effluent quality index such as deep purifying can stably reach Ш grades of indexs of surface water, meet Drinking Water water head site
Two level water standard.Artificial Wetland Techniques can respond requirement and the basin of China's Present Deepening conservation culture system reform
The popularization and application of comprehensive treatment realize water pollution control source, cut dirty, restoration of the ecosystem effect.
In Constructed Wetland Ecology System, packed bed is constituted by soil and matrix fill mixing, sewage is among packed bed
Filler gap or when bed body surface flow, filler carries out physical absorption to the poisonous and harmful substance in water body.Meanwhile it filling out
Expect that plantation has the water plant that process performance is good, adaptable, morphological appearance has ornamental value on bed, can form one
A artificial ecological system with sewage treatment function.
According to the difference of system water distribution manner, it is wet that artificial swamp can be generally divided into free water surface wetland, horizontal drowned flow artificial
Three kinds of ground and vertical current constructed wetland.Wherein, surface-flow is comparable to natural wetland the most, and investment is saved, operating cost is cheap,
But there are many problems, such as：Sewage treatment load is low, big by seasonal effect, and winter is easy the water surface and freezes, and summer is easy fly
Mosquito evil is given birth to.Horizontal subsurface flow wetland is flowed down over-wet land bed body filler in system surfaces by sewage.Due to the life of filler surface growth
The retention suction-operated of growing plants root system and filler in object film, filler gap, wastewater treatment efficiency and processing capacity are all
Better than surface current artificial wetland.In addition, since flow flows in packed bed, wet land system heat insulation effect is good, is influenced by temperature
Smaller, treatment effect is stablized, and sanitary condition might as well.Vertical current type artificial wetland be divided into unidirectional vertical current constructed wetland and it is compound hang down
Direct current artificial swamp, cost is higher, and northern area is using less at present.
Be required for using packed bed in horizontal drowned flow artificial wet land and vertical current type artificial wetland, and the selection of filler and
The technique for being laid with filler determines construction quality and project progress in actual production.Filler can provide life for the microorganism in water
Long spacing, and provide suitable growing environment for various water plant root systems.It is gone in water removal in addition, wet land filler can improve system
The ability of some of the contaminants is significantly increased especially for the process performance of high phosphorus waste water.Common filler has slag, coal
Slag, lime stone, gravel etc..Volcanic rock is mesoporous by a kind of functionality of volcanic glass, mineral and bubble formation after volcano eruption
Material is applied to the foundation construction of the occasions such as road, bridge, building, dykes and dams seawall extensively in recent years.Due to volcanic rock surface
With positive charge, there is stronger hydrophily, be conducive to the fixed growth of microorganism, biofilm development speed is fast and quantity is more.
Volcanic rock has 40% or so porosity, therefore light weight, large specific surface area, can be used as biofilter material and can be microorganism
Sufficient oxygen is provided, contact biofilm and the growth of microorganism are conducive to.
Currently, in the construction of drowned flow artificial wet land, the use of filler often reaches thousands of ten thousand steres, the paving of filler
If consuming a large amount of manpower, material resources and financial resources with installation, gabion technology can save the dismounting of set-up time ease of assembly, at present mainly
Applied to river course slope protection, the construction of biofilter, and the surface side filler of artificial swamp, there is presently no use cases.Work as gabion
When device is applied to filler laying, it there is problems that urgent need solves at present：
1. the aperture of current gabion is excessive, and current wetland packing material size is smaller, to be improved；
2. to pass through assembling before gabion installation, and easily deform upon in an assembling process, when gabion is used for bank protection and river
When road is repaired, this deformation will not influence too much, but in the process of deployment of current wetland, the deformation of gabion can influence
The laying of filler, and influence planting process later.
Invention content
The present invention is big for laying project amount present in existing artificial swamp laying packed art, and installation effectiveness is low, fills out
Expect the problems such as bed treatment effect is bad, propose it is a kind of be laid with quickly, it is detachable while can efficient absorption Water, phosphorus and again
Metal pollutant is conducive to the gabion construction method of the drowned flow artificial wet land of plant root growth.
The gabion construction method of the drowned flow artificial wet land of the present invention, including following procedure：
(1) gabion module is built：
Gabion module is made of purse seine and movable spacer screen, and purse seine is surrounded by four surface side nets, and movable spacer screen is arranged in purse seine
The intersection setting of bottom, purse seine upper opening, two adjacent surfaces side net vertically pulls muscle, and per surface side, the upper end of net is all connected with the horizontal drawing in upper layer
Muscle, per surface side, the lower end of net is all connected with bottom girt, is connected between upper layer girt and bottom girt on the net per surface side
Twice, graduation indication of the girt as filler are at least arranged in intermediate girt, intermediate girt, and the distance between girt is
The height of every layer of filler；
Purse seine and movable spacer screen separately transport, and purse seine flattens folding along muscle is vertically pulled, and stacks together；
(2) laying of gabion module and filler filling：
First by the purse seine pull-up of the gabion module of folding, then in purse seine bottom placement spacer screen；The discharge of gabion module is from slope
Bottom is carried out toward top of the slope direction, and the filler in gabion module is layered filling from the bottom to top, first horizontal specifically in entire wetland slope surface
Row's gabion module is most descended to putting, then is most descending all to load upper bottom filler in each gabion module of row, then in each gabion
Intermediate filler is filled out on the bottom filler of module, finally fills out top layer's filler on the intermediate filler of each gabion module, so
It is most descending above row's gabion module to put second row gabion module afterwards, is being filled out in second row gabion module by aforementioned process
Material completes the laying of gabion module and filler filling in entire wetland slope surface according to this；In this way operation prevent purse seine from deforming upon with
And there is gap between gabion module.
The bottom filler be seated in bottom girt and most under together between intermediate girt, intermediate filler is seated in
Among twice between girt, top layer's filler is filled to upper layer girt.
The bottom filler is the stone of grain size 5-8cm, and intermediate filler is the stone of grain size 3-5cm, top layer's filler
For the volcanic rock of grain size 1-3cm；
The thickness of the bottom filler is 30cm, and the thickness of intermediate filler is 30cm, and the thickness of top layer's filler is 30-
40cm。
The bottom filler and the mixed fillers that intermediate filler is lytag and stone, lytag and stone
Volume ratio be 1:9-1:3.
Top layer's filler is the mixed fillers of volcanic rock and zeolite, and the volume ratio of zeolite and volcanic rock is 1:9-1:5.
The present invention uses foldable gabion module, to undercurrent in terms of wire feeding, gabion improvement and gabion assemble three
The filler laying of wetland is improved, and can be prevented that gabion from deforming upon and gap occurs in gabion module, be improved engineering and apply
Work efficiency rate ensure that the stability of wetland operation, the manpower, material resources and financial resources saved.Gabion module is installed and volcanic filling material
It is combined, packed bed is divided into unit module, the filler that Performance of Constructed Wetlands Substrates bed is carried out by improveing gabion is laid with and peace
Dress is laid with without artificial, can do mechanization operation.It has the following advantages：
1. gabion module simple installation, construction is simple is time saving and energy saving, does not need special technique and supply of electric power.
2. the foldable transport of gabion, convenient transportation is with good economic efficiency in assemble in site.
3. having good flexibility, installed and used even if wetland bottom is nor affected on there are gradient.
4. stronger impact resistance.It is reached even if the stone in filler self can adjust if being subjected to displacement deformed structure
To balance, overall structure will not be destroyed.
5. preferable corrosion resistance and durability, the soda acid for adapting to different water bodys corrodes, and service life is long.
6. after increasing lacing wire and spacer screen in gabion module, overall stability can be effectively increased, make work progress more
Safety.
7. improving filling mixture ratio, effluent quality is improved, it is utmostly cost-effective.
8. gabion and volcanic filling material are used in conjunction, installation effectiveness can be effectively improved, construction basic condition requires low, maintenance pipe
Science and engineering makees easy, ecological environment benefit ideal, and can reduce cost of investment.
9. gabion arrangement installation process can take forklift mechanically actuated, by assembled gabion module in sequence by shoveling
Vehicle transports in current wetland, rapid and convenient.
10. machinery can be used with the mode being manually combined in gabion filling, the installation of rough filler can rely on excavator
Machinery filling, when being filled into, that the mode manually filled can be taken at the top of gabion to carry out top is smooth.A whole set of filling process
Rapidly, beautiful.
Description of the drawings
Fig. 1 is the structural schematic diagram of gabion module in the present invention.
Fig. 2 is the principle signal of the gabion construction method (layering of gabion module loads) of the drowned flow artificial wet land of the present invention
Figure.
Wherein：1. muscle is vertically pulled purse seine, 2., 3. upper layer girts, 4. intermediate girts, 5. bottom girts, 6. spacer screens, 7.
Bottom filler, 8. intermediate fillers, 9. top layer's fillers, 10. gabion modules.
Specific implementation mode
The construction work of current wetland include earth excavation, the laying of impervious barrier, the laying of filtrate, bank protection reinforce, it is aquatic
The processes such as the plantation of plant.Before being laid with filler, should first carry out earthwork adjustment, smooth river, be laid with clay, antiseepage film and
Bottom gravel.The gabion construction method of the drowned flow artificial wet land of the present invention is to install gabion module to tie with volcanic filling material
It closes, packed bed is divided into unit module, the filler that Performance of Constructed Wetlands Substrates bed is carried out by improveing gabion is laid with and installation.
The structure of one, gabion modules and utilization
Since gabion grid has the function of ideal ecological construction and ecological recovery, good pervious function, extremely stable
Ability, construction party are attacked with allomeric function pervious function, excellent corrosion resistance and durability, stronger antiscour and wind and wave resistance
Method is easy, structure design beauty feature, in the river training works of middle and small river, river habitat repair pushed away
Wide and application.Gabion is applied to the laying work of current wetland filler, filler can be effectively improved and be laid with efficiency and mechanization
Feasibility.
As shown in Figure 1, gabion module 10 (referring to Fig. 2) in the present invention is made of purse seine 1 and movable spacer screen 6, purse seine 1 by
Four surface side nets 1 surround, 1 bottom setting activity spacer screen 6 of purse seine, upper opening, and the intersection setting of two adjacent surfaces side net vertically pulls muscle
2, per surface side, the upper end of net is all connected with upper layer girt 3, and per surface side, the lower end of net is all connected with bottom girt 5, online per surface side
Intermediate girt 4 is connected between upper layer girt 3 and bottom girt 5, twice are at least arranged in intermediate girt 4.On purse seine 1
The girt of sustained height is mutually not connected to, in order to the folding of four surface side nets 1.Gabion module 10 in transport, individually put by spacer screen 6
It sets, is not placed in the net of side, purse seine 1 is vertically pulled to fold at muscle 2 at one and be packed up, again by spacer screen 6 after the net pull-up of side when construction is laid with
It is placed in purse seine 1.
Gabion module design size is：1m × 1m × 1m (length × width × height), side net are made of zinc-aluminium-alloy material
Twisted pair hexagon steel wire grid.Steel wire used in steel wire grid has extremely strong resistant to rust ability by zinc-plated processing,
Tensile capacity cannot be less than 350N/mm2.Gabion grid hole eye designed size is 2cm, and installs wire-mesh screen reinforcing, to prevent
Only filler leaks out.
Since the filler that current wetland is chosen will meet water plant root growth, the selection of dimension of packing material size is in 1-
Between 8cm, the gabion eyelet that this results in traditional size is excessive, be easy to cause filler and leaks out during the installation process.The present invention exists
Gabion module bottom surface increases spacer screen 6, prevents filler from being leaked out during filling.The pore size of spacer screen 6 meets in 1cm
Minimum filler is not leaked out.
Above-mentioned gabion module design is foldable pull-up structure, have the characteristics that can to transport, assemble it is rapid, at the scene can be with
By the quick pull-up assembling of folded form.Increased spacer screen 6 and lacing wire, capable of making purse seine, rapid pull-up restores original shape after folding
Shape, and lacing wire can increase the stability of improvement gabion, reduce deformation caused by after loading building stones, and the energy when gabion is laid with
Less gap, the plantation work of the follow-up water plant of aspect.Increase the stone filler that spacer screen 6 can effectively prevent body small to expose,
And certain mechanical support effect can be provided, the deformation of gabion module during the installation process is prevented.In addition, current wetland is deposited
In the filling of compounded mix, when, there are when lacing wire, the height and position of girt also provides packed height and volume in side net 1
Scale instructs.
Gabion module 10 is due to collapsed transportable, and there may be bottom, periphery deformation when to prevent artificial pull-up gabion side from netting
The case where, design vertically pulls muscle 2 and girt 5, and side deformation caused by capable of effectively reducing pull-up, filling filler is conducive to simultaneously
It is laid with the reasonable Mi Pu of gabion.And bottom it is uneven or cannot comply with wetland bottom surface gradient can cause gabion can not Mi Pu, influence to dive
Flow treatment effect and and the subsequent maintenance work of wetland.Therefore it is noted that flat bottom surface, in bottom after the net of pull-up gabion side
It is laid with spacer screen 6, spacer screen 6 need not connect with side sieve bottom, there can be the qualitative effect of certain reinforcing, be also functioned to smaller filler
Certain protective effect reduces filler leakage.And in bottom, increase spacer screen 6 will not comply with gradient to gabion and impact, stone
Cage module still can occur a degree of inclination and comply with wetland bottom configuration.
It is followed successively by bottom filler 7, intermediate filler 8 and top layer's filler 9 from bottom to top referring to Fig. 2, in gabion module 10,
Bottom filler 7 is the stone of grain size 5-8cm, and intermediate filler 8 is the finger stone of grain size 3-5cm, and top layer's filler 9 is grain size 1-
The volcanic rock of 3cm.
Two, gabions are laid with and its filling of interior filler
Filler part is the core of current wetland, needs good permeability and adsorption capacity, is again water plant
Good growing environment is provided with the microorganism in water body.Ensure sewage by when speed reach stable range, again
There is certain permeability.Common filtrate is generally divided into three layers, from top to bottom respectively filter material layer, transition zone and drainage blanket.Stone
Cage module is mainly used in the laying of filter material layer.
The filler selection of current wetland is related to wetland effluent water quality and engineering construction cost, maintenance cost.In engineering
Common filler is stone, volcanic rock, zeolite, slag, cinder etc..Wherein, volcanic filling material is natural more empty volcano rock and ores,
By the indefinite form granular filler that the series of process such as ore dressing, broken, screening, grinding are process, main component is titanium dioxide
Silicon, calcium oxide, magnesia, iron oxide and aluminium oxide etc..Volcanic rock is the more empty shape fillers of honeycomb, in biofilter is applied, fire
The biomembrane formed on the rock filler of mountain more closely, and can store a large amount of activated sludge in filler gap.Volcanic rock biology
Filler corrosion resistance is strong, and has inertia, is not involved in the biochemical reaction of biomembrane, nontoxic, unrestraint in the environment
The activity of microorganism is environmental-friendly, of low cost, the good Performance of Constructed Wetlands Substrates for the treatment of effect.
The construction work of current wetland should first carry out earthwork adjustment, smooth river, be laid with clay, antiseepage film and bottom gravel
Stone.
The laying process of current gabion module is laid with as unit of cell, it is contemplated that practical current wetland
It is that unit laying be easy to cause gabion deformation there are certain gradient, cell, the present invention using loading step by step, along gradient direction
Upwards, it successively loads, minimum degree reduces the deformation of gabion module 10.
As shown in Fig. 2, when the present invention loads filler in gabion module 10, first by 1 pull-up of side net of folding, in side net bottom
Place spacer screen 6 in portion.The mode of mechanical transport is taken in the placement of gabion module, takes forklift machinery by assembled gabion module batch
Amount is transported in current wetland, rapid and convenient.The filling of filler will consider the side of the flow and gradient of current wetland in gabion
To filling should be carried out from bottom of slope toward top of the slope direction, the method for taking layering to load：Lower row's gabion is first put since bottom of slope
Module is then most descending all fillings in each gabion module 10 of row to go up bottom filler 7, then in the bottom of each gabion module 10
Intermediate filler 8 is all filled out on filler 7, finally all fills out top layer's filler 7 on the intermediate filler 8 of each gabion module 10, then
Second row gabion module is put above most next row gabion module, is filled out in second row gabion module by aforementioned process
Material, completes the laying of gabion module in entire wetland slope surface according to this.Operation can prevent gabion from deforming upon and gabion in this way
There is gap in module.Machinery can be used in filling process with the mode being manually combined, the installation of rough filler can rely on digging
The machinery filling of pick machine can take the mode manually filled smooth to top progress when being filled at the top of gabion.The whole series filling
Process is rapid, beautiful.
It is the height of every layer of filler that girt in gabion module 10, which can be used as graduation indication, the distance between girt,
Degree, when filling, also facilitate the volume of observation building stones.Bottom filler 7 is seated in bottom girt 5 and most one intermediate girt 4
Between, intermediate filler 8 is seated between two intermediate girts 4, and top layer's filler 9 is filled to upper layer girt 3.The bottom is filled out
The thickness of material 7 is 30cm, and the thickness of intermediate filler 8 is 30cm, and the thickness of top layer's filler 9 is 30-40cm.
Due to the design of lacing wire, water quality requirement can be complied with and choose the different compound assembly of filler progress.Such as：Work as water inlet
(V ＜ 100m when water pollution degree very high (COD ＞ 100mg/L) and smaller current wetland volume3), slag, cinder can be chosen
The equal filler that adsorption effects are more preferable, cost is slightly higher and stone collocation are loaded.Specific collocation can refer to water body index and slag, coal
The particle size of the fillers such as slag.For example, lytag has preferable treatment effect to high phosphorus waste water, contain when entering water water quality phosphorus
The mode higher, current wetland filler can combine lytag with stone is measured, effluent quality index is improved.In view of cost
And lytag particle size and morphological differences, the volume ratio with stone filler can be 1:9-1:3, the specific position of filling
Setting should be by the size of the grain size of filler, being ranked sequentially from small to large from the top of packing layer to lower part grain size.For another example, zeolite is filled out
Material has the ammonia nitrogen in water the Adsorption effect of highly significant, thus for the high current wetland of ammonia-nitrogen content can by zeolite with
The mode of stone combination is filled, and the volume ratio of filling should be set as 1:9-1:5, since the grain size of zeolite is smaller, generally put
Set the top layer in packing layer.
Claims (6)
1. a kind of gabion construction method of drowned flow artificial wet land, characterized in that including following procedure：
(1) gabion module is built：
Gabion module is made of purse seine and movable spacer screen, and purse seine is surrounded by four surface side nets, and movable spacer screen is arranged in the bottom of purse seine,
The intersection setting of purse seine upper opening, two adjacent surfaces side net vertically pulls muscle, and per surface side, the upper end of net is all connected with upper layer girt, often
The lower end of surface side net is all connected with bottom girt, horizontal among connection between upper layer girt and bottom girt on the net per surface side
Twice, graduation indication of the girt as filler are at least arranged in lacing wire, intermediate girt, and the distance between girt is every layer and fills out
The height of material；
Purse seine and movable spacer screen separately transport, and purse seine flattens folding along muscle is vertically pulled, and stacks together；
(2) laying of gabion module and filler filling：
First by the purse seine pull-up of the gabion module of folding, then in purse seine bottom placement spacer screen；The discharge of gabion module is past from bottom of slope
Top of the slope direction carries out, and the filler in gabion module is layered filling from the bottom to top, is first laterally put specifically in entire wetland slope surface
It puts and most descends row's gabion module, then most descending all to load upper bottom filler in each gabion module of row, then in each gabion module
Bottom filler on fill out intermediate filler, finally fill out top layer's filler on the intermediate filler of each gabion module, then exist
It most descends above row's gabion module and puts second row gabion module, filler is loaded in second row gabion module by aforementioned process, according to
This completes the laying of gabion module and filler filling in entire wetland slope surface；Operation prevents purse seine from deforming upon and gabion in this way
Occurs gap between module.
2. the gabion construction method of drowned flow artificial wet land according to claim 1, characterized in that the bottom filler dress
Fill out in bottom girt and most under together between intermediate girt, intermediate filler is seated among twice between girt, most upper
Layer filler is filled to upper layer girt.
3. the gabion construction method of drowned flow artificial wet land according to claim 1, characterized in that the bottom filler is
The stone of grain size 5-8cm, intermediate filler are the stone of grain size 3-5cm, and top layer's filler is the volcanic rock of grain size 1-3cm.
4. the gabion construction method of drowned flow artificial wet land according to claim 1, characterized in that the bottom filler
Thickness is 30cm, and the thickness of intermediate filler is 30cm, and the thickness of top layer's filler is 30-40cm.
5. the gabion construction method of drowned flow artificial wet land according to claim 1, characterized in that the bottom filler and
Intermediate filler is the mixed fillers of lytag and stone, and the volume ratio of lytag and stone is 1:9-1:3.
6. the gabion construction method of drowned flow artificial wet land according to claim 1, characterized in that top layer's filler is
The volume ratio of the mixed fillers of volcanic rock and zeolite, zeolite and volcanic rock is 1:9-1:5.
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Cited By (8)
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| CN109898473A (en) * | 2018-12-11 | 2019-06-18 | 北京林业大学 | Ecological permeable groynes system |
| CN109970205A (en) * | 2019-03-15 | 2019-07-05 | 山东省环科院环境工程有限公司 | A kind of the ventilation anti-seepage drowned flow artificial wet land and its operation method of efficient denitrification |
| CN110002670A (en) * | 2019-03-29 | 2019-07-12 | 浙江融信环保科技有限公司 | A method of suitable for the synchronous restoration of the ecosystem of Mountain river cities and towns section waterfront |
| CN110589973A (en) * | 2019-08-23 | 2019-12-20 | 杭州肄康新材料有限公司 | Artificial wetland filter material particles and laying construction method thereof |
| CN110627244A (en) * | 2019-10-14 | 2019-12-31 | 浙江省淡水水产研究所 | Gabion net mechanism suitable for pond culture tail water treatment and use method |
| CN112211157A (en) * | 2020-09-28 | 2021-01-12 | 重庆市环境保护工程设计研究院有限公司 | Ecological restoration method for micro-topography of abandoned sand pit of riparian zone in high-altitude area |
| CN112794560A (en) * | 2020-12-25 | 2021-05-14 | 北京北华中清环境工程技术有限公司 | In-situ ecological purification module and system for polluted water treatment |
| CN114934478A (en) * | 2022-04-25 | 2022-08-23 | 四川中港建设工程有限公司 | River channel gabion protection pad ecological revetment and construction method thereof |
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