CN106477724A - A kind of ecological pretreatment system for being applied to river water body reparation - Google Patents
A kind of ecological pretreatment system for being applied to river water body reparation Download PDFInfo
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- CN106477724A CN106477724A CN201510539894.6A CN201510539894A CN106477724A CN 106477724 A CN106477724 A CN 106477724A CN 201510539894 A CN201510539894 A CN 201510539894A CN 106477724 A CN106477724 A CN 106477724A
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention belongs to Ecological Restoration Project technical field, and in particular to a kind of ecological pretreatment system for being applied to river water body reparation.Described be applied to river water body reparation ecological pretreatment system, including set gradually along river course upstream to downstream direction dam body, gravel area, retain unit, pretreatment unit, emergent aquactic plant planter units, wind and wave resistance submerged plant planting unit.The ecology pretreatment system, can slow down upland water water volume flow rate, can resist current scour, Adsorption pollutant in water, reduce follow-up Pollution of Eco-system Environment load.The present invention have reasonable in design, simple structure, low cost, easy to use the features such as, have a good application prospect.
Description
Technical field
The invention belongs to Ecological Restoration Project technical field, and in particular to a kind of ecological pretreatment for being applied to river water body reparation
System.
Background technology
Urban river is the important base of urban ecological environment, is a kind of important natural resources and environment carrier, and it refers to send out
Come from city or river or the section in city is flowed through, and history is by hand excavation, through evolution for many years and with natural river feature
Canal, canal system.With other fluvial facies ratios, urban river is more close with the productive life activity relationship of the mankind, advises in city
The effect for drawing performance in building is also more notable, and therefore, the hydrological characteristics of urban river, physical aspect and the ecosystem are more susceptible to
Intervention to mankind's activity.With the quickening of urban construction paces, population growing, in a large number undressed sanitary sewage,
Industrial wastewater is discharged into river, causes the river ecosystem closely bound up with human lives gradually to be degenerated, especially cities and towns
Middle and small river, sewage collecting efficiency are limited with treatment scale, and along with its environmental carrying capacity is little, self-purification capacity is weak, the ecosystem is received
To heavy damage, strengthen the water correction to urban river and restoration of the ecosystem work is extremely urgent.
At present, domestic and international researcher is conducted extensive research for river pollution recovery technique, and achieves certain research
Achievement.River pollution recovery technique refers to the side for by various technology and means, making the pollutant in sewage be removed or convert
Method.According to the difference of cleaning principle, river water body purification techniques can be divided into peripheral doses technology, chemical remediation technology and biology
- ecological reestablishment three major types.Physical treatment technology has the advantages that equipment is simple, low cost, convenient management, but by being suitable for
Scope and the restriction that can not thoroughly repair ecosystem shortcoming, peripheral doses technology are generally required and other recovery technique fit applications.
Chemical restoration is exactly briefly chemistry and the materialization effect using chemical agent, including neutralization, precipitation, flocculation etc., will pollute
The method that thing is mutually transferred to another kind of thing phase from water.The chemical purification method for having application example at present mainly includes chemical algae removing and wadding
Retrogradation is formed sediment, and all achieves certain effect.Although adopting the simple and easy to do and instant effect of chemical restoration, fundamentally do not disappear
Depollution thing, and add chemical agent and be also easy to produce secondary pollution.
Practice have shown that, either bed mud and artificial aeration's aeration dredged using physical method, still chemical repair method adopted,
Persistently effective effect all can not be obtained in river, or even can also aggravate to destroy original ecosystem.Water pollution is substantially
It is the degeneration of ecosystem function, it is therefore necessary to explore the new of effective water pollution improvement with ecological theory and technology
Approach.
Apply now relatively broad, the lasting ecological reestablishment of effect be aquatile method, aquatile method be by build water
Perfect aquatic ecosystem in body, using the absorption and sorption of plant, the eating of animal, transformation improves water quality, from
Fundamentally change the eco-treatment technology of river course environment.It is excellent that aquatile method has good, duration length of ecological, environmental protective, effect etc.
Point, but because which is mainly made up of plant, overall poor impact resistance, it is impossible to suitable for upland water amount is big, flow velocity water body faster.
Content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of ecology for being applied to river water body reparation
Pretreatment system, the ecology pretreatment system, can slow down upland water water volume flow rate, can resist current scour, Adsorption
Pollutant in water, the follow-up Pollution of Eco-system Environment load of reduction.
For realizing above-mentioned and other purpose, the present invention is employed the following technical solutions：
A kind of a first aspect of the present invention, there is provided ecological pretreatment system for being applied to river water body reparation, including along river course
Swim to downstream direction set gradually dam body, gravel area, retention unit, pretreatment unit, emergent aquactic plant planter units, wind resistance
Unrestrained submerged plant planting unit.
The dam body, for slowing down upland water water volume flow rate.
The gravel area, for slowing down upland water water volume flow rate further.
The retention unit, for being intercepted the debris in upper river water.
The pretreatment unit, for the water through the retention, using artificial aquatic weed and water plant carry out the absorption of nitrogen phosphorus with
And microbial degradation.
The emergent aquactic plant planter units, for making the water through the pretreatment unit, are filled using emergent aquactic plant and bio-film colonization
Putting carries out the absorption of further nitrogen phosphorus and microbial degradation.
Wind and wave resistance submerged plant planting unit, with the water then through the emergent aquactic plant planter units, is carried out using submerged plant
Suspension is intercepted, nitrogen phosphorus absorbs.
Preferably, the dam body adopts overfall dam.
Preferably, the gravel area is filled with coarse grain gravel or macrosome gravel, a diameter of 50mm-100mm of the gravel.
Preferably, the retention unit adopts permeable filter.The permeable filter is arranged to groynes form.
Preferably, the pretreatment unit, including artificial aquatic weed growing area under water and water plant planting area waterborne.
Preferably, the artificial aquatic weed under water in the growing area of artificial aquatic weed under water forms the water surface with fixing hole on the water surface
Ecological floating island, is that the water plant that plants in the water plant planting area waterborne provides immobilization carrier.
Preferably, one or more in iris, cyperus alternifolius, mullet grass, water opium poppy or mushroom grass of the water plant.
Wherein, the Latin of the iris is entitled：Iris tectorum Maxim.The entitled Cyperus alternifolius of the Latin of cyperus alternifolius.
The entitled Pontederia cordata L. of the careless Latin of the mullet.The entitled Hydrocleys nymphoides of the Latin of the water opium poppy.
The entitled hydrocotyle vulgaris of the careless Latin of the mushroom.
Preferably, the upstream and downstream of the pretreatment unit is respectively equipped with fixing grid.
Preferably, the pretreatment unit bottom is provided with falling body.
Preferably, the emergent aquactic plant planter units, including ecological floating island and the emergent aquactic plant kind positioned at ecological floating island top
Growing area and the bio-film colonization device positioned at ecological floating island bottom.
Preferably, in the emergent aquactic plant growing area plant emergent aquactic plant selected from iris, cyperus alternifolius, mullet grass, water opium poppy or
One or more in mushroom grass.
Preferably, the submerged plant that plants in wind and wave resistance submerged plant planting unit is selected from red line grass.Preferably, the red line grass
Planting density be 130 plants/m2, plant height 40-60cm.
The entitled Potamogeton pectinatus L. of the careless Latin of the red line.
A second aspect of the present invention, there is provided a kind of river water body restorative procedure, its are applied to river water body reparation using above-mentioned
Ecological pretreatment system, river water body is repaired.
As discussed previously with respect to prior art, the present invention has the advantages that：
(1) the river course pretreatment system of the present invention, is provided with dam body and retention unit, can effectively slow down upland water impact；
Pretreatment unit slow down the impact of upland water further so that upland water is relatively stable, can accelerate water
The solid matter deposition of carrying.After emergent aquactic plant planter units, the turbulent flow of upland water is through four roads
Water conservancy unhurried current facility, turbulent flow become metastable uniform flow, and masses hit power is substantially reduced.
(2) two chinampa facilities are provided with before and after the present invention, that is, pretreatment unit and emergent aquactic plant planter units, manually
Pasture and water and bio-film colonization system after cultivating after a while, surface attachment biomembrane, can effective purifying water body
In various pollutants, reduce impact of the upstream contaminant to river water quality.
In sum, the present invention have reasonable in design, simple structure, low cost, easy to use the features such as, with good should
Use prospect.
Description of the drawings
Fig. 1 is the structural representation of the ecological pretreatment system for being applied to river water body reparation of the present invention.
Fig. 2 is the pretreatment unit structural representation in the ecological pretreatment system for being applied to river water body reparation of the present invention.
Fig. 3 is that the emergent aquactic plant planter units structure being applied in the ecological pretreatment system of river water body reparation of the present invention is shown
It is intended to.
Reference：
1 dam body
2 gravel areas
3 retention units
4 fix grid
5 pretreatment units
6 fix grid
7 emergent aquactic plant planter units
8 wind and wave resistance submerged plant planting units
9 artificial aquatic weed growing areas under water
10 hawsers
11 falling bodies
12 water plant planting areas waterborne
13 ecological floating islands
14 emergent aquactic plant growing areas
15 bio-film colonization devices
16 fixing devices
Specific embodiment
Hereinafter embodiments of the present invention are illustrated by particular specific embodiment, those skilled in the art can be taken off by this specification
The content of dew understands other advantages of the present invention and effect easily.
It should be clear that structure depicted in this specification institute accompanying drawings, ratio, size etc., all only in order to coordinate disclosed in specification
Content, so that those skilled in the art understands and reads, is not limited to the enforceable qualifications of the present invention, therefore does not have
Technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, do not affecting institute's energy of the present invention
Under effect of generation and the purpose that can reach, still all should fall in the range of disclosed technology contents are obtained and can be covered.
Meanwhile, in this specification cited such as " on ", D score, "left", "right", the term of " centre " and " " etc., be merely convenient to
Described understands, and is not used to the enforceable scope of the restriction present invention, being altered or modified for its relativeness, substantially changes in nothing
Under technology contents, when being also considered as the enforceable category of the present invention.
Technical problem solved by the invention can be achieved through the following technical solutions：
(1) dam body
Upper river water first passed through dam body, such as overfall dam, to slow down upland water water before water purification system is entered
Rate of flow of fluid.
(2) gravel area
Upper river water is after slowing down through dam body, then through being filled with the gravel area of coarse grain or macrosome gravel, slows down further
Impact of the upland water to river bed, reduces water body kinetic energy.Meanwhile, gravel surface can also form certain thickness biomembrane, can be just
Step reduces water pollutant concentration.
(3) unit is retained
Upper river water after the double-reduction of dam body and gravel area, then through permeable filter, by thick rubbish and drift
Float is trapped in outside filter, and the rubbish being retained down outside filter is periodically cleared up.The permeable filter is arranged to groynes form,
The filter frontal impact power of groynes form is less than vertical filter, and the filter of groynes form makes full use of water body vortex, can cut down energy
Amount, reduces water body and washes away, protect bank slope safety.
(4) pretreatment unit
It is pretreatment unit in the downstream of permeable filter, pretreatment unit is for river course by living or trade effluent is affected to cause
A kind of processing unit that pollutant levels are high, the discharge of sewage is unstable and design, the unit catchment lower artificial aquatic weed and the water surface ecological
The technology such as chinampa are in one.
Artificial aquatic weed is arranged to mesh-like under water, and mesh-like can not only increase the contact area of artificial aquatic weed under water and current, with
When can also form water surface ecological floating island with fixing hole on the water surface.Can in the fixing hole planting aquatic plants, one
Aspect, water plant root system are can absorb using the nutritive salt in water body, strengthen dirt-removing power；On the other hand, beautification scape can be played
The effect of sight.Meanwhile, the degraded with root system surface microorganism is absorbed by water plant, it is also possible to remove partial contamination thing.
Artificial aquatic weed, can provide good attachment interface for microorganism, form microbial film on artificial aquatic weed surface, reduce under water
The loss of microorganism in sewage disposal process, improves the ability of system antipollution load, so as to greatly improve the effect of sewage disposal.
(5) emergent aquactic plant planter units
The downstream of pretreatment unit is emergent aquactic plant planter units, and emergent aquactic plant planter units plant emergent aquactic plant using ecological floating island.
Ecological floating island can be adjusted height automatically according to river water level, create good growing environment condition to emergent aquactic plant, have
Survival and growth beneficial to plant.Ecological floating island bottom adopts water plant biofilm system, and the root system of plant can be provided for microorganism
Good attachment interface, is that various microorganisms provide existence home, forms microbial film, reduce microorganism in sewage disposal process
Loss, improve system antipollution load ability, so as to greatly improve the effect of sewage disposal.
(6) wind and wave resistance submerged plant planting unit
The downstream of emergent aquactic plant planter units is wind and wave resistance submerged plant planting unit, plants wind and wave resistance submerged plant in river bed, rises
To intercepting suspension, absorbed nitrogen phosphorus, the clean-up effect such as enhance the transparency.
More specifically, refer to as shown in Figure 1 to Figure 3, upper river water first passes through the continuous of dam body 1 and gravel area 2
After deceleration, then after retaining the interception of unit 3, enter pretreatment unit 4.
The species of the dam body 1 is not limited, as long as upland water water volume flow rate can be slowed down.Preferably, the dam body 1 can
For overfall dam, to slow down upland water water volume flow rate.
Gravel area 2 that downstream laying in the dam body 1 is made up of the coarse grain of 50mm-100mm, macrosome, the gravel area 2
Can be with river bed with width, length is 10m.The setting of the gravel area 2 can slow down impact of the upland water to river bed, reduce water
Body kinetic energy, while gravel surface can form certain thickness biomembrane, can tentatively reduce water pollutant concentration.
Retention unit 3 is set in the downstream of the gravel area 2, the species of the retention unit 3 is not limited, as long as can intercept in water
Thick rubbish and floating thing.Preferably, the retention unit 3 can be permeable filter.The permeable filter adopts resistance to punching
Hit, high tensile steel wire grid that corrosion resistance is strong, grid-gap is 200mm*200mm.Filter vertically squeezes into river bed by a row
Reinforced concrete pile fix, a diameter of 20cm of reinforced concrete pile, spacing be 1m.Filter is arranged to groynes form, groynes
The filter frontal impact power of form is less than vertical filter, and the filter of groynes form makes full use of water body vortex, can cut down energy,
Reduce water body to wash away, protect bank slope safety.
Pretreatment unit 5 is set at the retention 3 3～10m of downstream of unit.The pretreatment unit 5 includes artificial aquatic weed under water
Growing area 9 and water plant planting area 12 waterborne.
The upstream and downstream of the pretreatment unit 5 is respectively equipped with fixing grid 4 and fixing grid 6.
The bottom of the pretreatment unit 5 is provided with falling body 11.Primarily serve the effect of fixing artificial aquatic weed.
9 width 18m of artificial aquatic weed growing area under water, along the long 4m of water (flow) direction.Planted in artificial aquatic weed planter units 9 under water
Artificial aquatic weed is arranged to mesh-like under water, and mesh-like can not only increase the contact area of artificial aquatic weed under water and current, while also
The water surface ecological floating island with fixing hole can be formed on the water surface, be the kind of water plant in top water plant planter units 12
Plant and immobilization carrier is provided, water plant directly can be planted in the fixing hole of artificial aquatic weed composition.Preferably, on vertical riverbank
Direction, the spacing of artificial aquatic weed is 150mm, and parallel to riverbank direction, the spacing of artificial aquatic weed is 100mm.Artificial aquatic weed
Screen cloth arrangement, on the water surface formed 150*100 fixing hole.
Preferably, the artificial aquatic weed material is superfine fiber stereoscopic artificial aquatic weed, and such superfine fiber stereoscopic artificial aquatic weed has
Extremely strong ageing resistance, service life more than 15 years, with much fine hole between superfine fibre, with 8000m2/m3
Above high specific surface area, with high-hydroscopicity and extremely strong adsorption capacity, is more beneficial for the load of microorganism, so as to fast
Nutriment in fast decomposition and consumption water body.The artificial aquatic weed left and right sides is fixed by hawser 10, and hawser two ends are and two sides respectively
Timber on, fixed by fixing grid 4 and fixing grid 6 before and after artificial aquatic weed respectively, described fixing grid is optional
Permeable enclosure, permeable enclosure material herein is high tensile steel wire grid, and grid-gap is 100mm*100mm.Grid passes through one
Row vertically squeezes into river bed, and a diameter of 20cm reinforced concrete pile is fixed, and spacing is 1m.Grid is separately positioned on artificial aquatic weed
Trip and downstream, primarily serve fixing longitudinal direction (parallel to flow direction) artificial aquatic weed, strengthen artificial aquatic weed floating island device steadiness
Effect.
One or more in the water plant, preferably iris, cyperus alternifolius, mullet grass, water opium poppy or mushroom grass.Upper water
Plant root system is can absorb using the nutritive salt in water body, intensifying device dirt-removing power, while landscape effect can be beautified.
For being emergent aquactic plant planter units 7, the emergent aquactic plant planter units 7 include ecological floating in the downstream of the pretreatment unit 5
Island 13 and the emergent aquactic plant growing area 14 positioned at ecological floating island top and the bio-film colonization device 15 positioned at ecological floating island bottom.
Ecological floating island can be adjusted height automatically according to river water level, create good growing environment condition to emergent aquactic plant,
Be conducive to survival and the growth of plant.Ecological floating island bottom adopts water plant biofilm system, and the root system of plant can be carried for microorganism
For good attachment interface, it is that various microorganisms provide existence home, microbial film is formed, reduces micro- life in sewage disposal process
The loss of thing, improves the ability of system antipollution load, so as to greatly improve the effect of sewage disposal.
The eight side types such as the setting of ecological floating island is preferably shaped to, wait eight side type ecological floating island forms more to meet flow direction, and current are rushed
Hit less, can more keep stable in the very fast region of current.
The ecological floating island 8 adopts macromolecular material framework, and chinampa bottom adopts watermifoil bio-film colonization device.From watermifoil
Deng water plant as biofilm formation device, ecological, environmental protective, low cost.
One or more in the preferred iris of the emergent aquactic plant, cyperus alternifolius, mullet grass, water opium poppy or mushroom grass.Clean-up effect
Good, landscape effect is good.
The a diameter of 5m in every group of chinampa, every group of ecological floating island central vertical squeeze into fixing device 16 to realize the fixation to ecological floating island
Effect.It is preferred that, the fixing device is firm stake.
, substantially to slow down, water quality is relatively preferable for this region water volume flow rate.
The downstream of emergent aquactic plant planter units is wind and wave resistance submerged plant planting unit 8, plants wind and wave resistance submerged plant in river bed,
Play interception suspension, absorbed nitrogen phosphorus, the clean-up effect such as enhance the transparency.The wind and wave resistance submerged plant planting unit width 8m,
Long 20m.The preferred red line grass of the wind and wave resistance submerged plant, red line grass seeds density in planting is 130 plants/m2, plant height 40-60cm.
The ecological pretreatment system of the present invention is applied to river water body reparation, day output 1000m3, continuously run 2 months years
Average treatment effect as shown in table 1.
1 Shanghai river course of table runs 2 months water quality condition contrast tables (mean value)
| Water quality parameter | Water inlet | Water outlet | Reduced rate (%) |
| Flow velocity (m3/S) | 0.6 | 0.3 | 50 |
| Ammonia nitrogen (mg/L) | 4.05 | 2.94 | 27.4 |
| Total phosphorus (mg/L) | 0.53 | 0.36 | 32 |
| COD (mg/L) | 46.8 | 35.1 | 25 |
| Total nitrogen (mg/L) | 5.78 | 4.56 | 21 |
2 Zhejiang river course of table runs 2 months water quality condition contrast tables (mean value)
| Water quality parameter | Water inlet | Water outlet | Reduced rate (%) |
| Flow velocity (m3/S) | 0.5 | 0.27 | 46 |
| Ammonia nitrogen (mg/L) | 2.56 | 1.82 | 29 |
| Total phosphorus (mg/L) | 0.69 | 0.47 | 32 |
| COD (mg/L) | 36.9 | 26.9 | 27 |
| Total nitrogen (mg/L) | 3.75 | 2.90 | 22.7 |
Above-described embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any it is familiar with this technology
Personage all modifications and changes can be carried out to above-described embodiment without prejudice under the spirit and the scope of the present invention.Therefore, Ju Fansuo
All for having in category technical field that usually intellectual completed under without departing from disclosed spirit and technological thought are equivalent
Modifications and changes, must be covered by the claim of the present invention.
Claims (10)
1. a kind of be applied to river water body reparation ecological pretreatment system, it is characterised in that include along river course upstream to downstream direction according to
The dam body of secondary setting, gravel area, retention unit, pretreatment unit, emergent aquactic plant planter units, wind and wave resistance submerged plant
Planter units.
2. according to claim 1 ecology pretreatment system, it is characterised in that the dam body adopts overfall dam.
3. according to claim 1 ecology pretreatment system, it is characterised in that the gravel area is filled with coarse grain gravel or macrosome
Gravel, a diameter of 50mm-100mm of the gravel.
4. according to claim 1 ecology pretreatment system, it is characterised in that the retention unit adopt permeable filter；Described
Permeable filter is arranged to groynes form.
5. ecology pretreatment system according to claim 1, it is characterised in that the pretreatment unit, including artificial water under water
Grass seeds growing area and water plant planting area waterborne.
6. according to claim 5 ecology pretreatment system, it is characterised in that the upstream and downstream of the pretreatment unit is respectively equipped with
Fixing grid.
7. according to claim 5 ecology pretreatment system, it is characterised in that the pretreatment unit bottom is provided with falling body.
8. according to claim 1 ecology pretreatment system, it is characterised in that the emergent aquactic plant planter units, including ecology
Chinampa and the emergent aquactic plant growing area positioned at ecological floating island top and the bio-film colonization device positioned at ecological floating island bottom.
9. according to claim 1 ecology pretreatment system, it is characterised in that in wind and wave resistance submerged plant planting unit plantation
Submerged plant is selected from red line grass.
10. a kind of river water body restorative procedure, it is characterised in that methods described is utilized as claim 1～9 any claim institute
The ecological pretreatment system for being applied to river water body reparation that states, repairs to river water body.
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| CN107365031A (en) * | 2017-09-01 | 2017-11-21 | 重庆环投生态环境监测网络与工程治理有限公司 | A kind of river course distribution method that city inland river self-purification capacity is substantially improved |
| CN107524116A (en) * | 2017-08-24 | 2017-12-29 | 宁波市产城生态建设集团有限公司 | A kind of method of river course rigidity revetment ecology |
| CN108423830A (en) * | 2018-01-30 | 2018-08-21 | 苏州农业职业技术学院 | A kind of floating-island type nitrogen and phosphorus loss ecological intercepting irrigation canals and ditches |
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| CN111204858A (en) * | 2020-03-27 | 2020-05-29 | 重庆市生态环境科学研究院 | River normal position quality of water promotes structure |
| CN113045134A (en) * | 2021-03-24 | 2021-06-29 | 河海大学 | Double-layer enclosure system and method suitable for river ecological restoration pretreatment |
| CN115478511A (en) * | 2022-09-19 | 2022-12-16 | 陕西省环境科学研究院 | Composite habitat system for improving water quality of high-flow-rate and high-sand-content riverway |
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Application publication date: 20170308 |