CN206337082U - Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system - Google Patents
Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system Download PDFInfo
- Publication number
- CN206337082U CN206337082U CN201621169606.9U CN201621169606U CN206337082U CN 206337082 U CN206337082 U CN 206337082U CN 201621169606 U CN201621169606 U CN 201621169606U CN 206337082 U CN206337082 U CN 206337082U
- Authority
- CN
- China
- Prior art keywords
- field
- rice field
- nitrogen phosphorus
- drainage ditch
- rice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Biological Wastes In General (AREA)
Abstract
The utility model discloses a kind of gentle slope paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, belong to rice field liquid manure efficiently using and nitrogen phosphorus diafiltration intercept removal system category.Removal system, step agricultural drain recharge, which are intercepted, including irrigation of paddy fields filtration system, raceway groove nitrogen phosphorus utilizes system, small reservoir retaining ecological wetland treatment system.Farmland filtration system is set in rice field, rice field land drainage is imported by the sub-lateral drainage ditch arranged along contour by rice check field face delivery port, gentle slope ground orographic condition, eminence paddy field drainage is set to be recycled into lower rice field, the rainwater that eminence rice field can not be put aside during rainfall directly imports diafiltration farm ditch by rice field delivery port and discharged, irrigation pumping station is set up at the small reservoir that afterbody field is percolated near the tail end of raceway groove, water is recirculated and utilizes the recharge for carrying out farmland.The utility model easy construction, quantities is small, intercepts and removes and the efficient utilizing status of liquid manure step with good nitrogen and phosphorus pollutantses.
Description
Technical field
Paddy field drainage is recycled and nitrogen phosphorus step diafiltration interception removal system, category the utility model with being related to a kind of gentle slope
Efficiently removal system category is intercepted in rice field liquid manure using with the diafiltration of nitrogen phosphorus.
Background technology
Southern gentle slope regional relief less, terrain slope is distributed in less than 5 °, but ground is rugged and rough, by company
Continuous constantly short massif composition.Plant agricultural to the current regional gentle slope of south China to occupy an leading position, chief crop is still with water
Based on rice.Irrigation system configuration mode typically can be divided into three kinds by regional elevation：The river valley for being distributed in relatively flat rushes field, uses
Small-sized water pumping irrigation system；Hillside ground Middle Zone, the system combined using small reservoir retaining with irrigation by pumping；Hillside overground part
Band, then it is main to use small reservoir catchwork irrigation system.Abundant rainfall, economically developed southern gentle slope it is regional, due to special ground
Shape feature, Rice Production process Pesticides, chemical fertilizer are unreasonable in addition and are excessively used, and nitrogen phosphorus nutrient passes through farmland rainfall, irrigation
Draining forms rainwash and enters rice field surrounding body, and farmland soil erosion and pollution of area source are more serious, farmland COD, nitrogen, phosphorus
Exceed the 45% of total amount Deng major pollutants amount discharge capacity, caused water bodies of rivers and lakes eutrophication to aggravate, serious shadow
The water environment and ecological safety to south China are rung, the sustainable development of economic society is hindered.Therefore, how south is solved conscientiously
Gentle slope regional paddy water and soil keep and widespread pollution from the overuse of fertilizers and pesticides in rural area problem, realize that liquid manure step is efficiently utilized, effectively intercept and remove agriculture
Nitrogen phosphorus substance in track and field stream, the problem of in the urgent need to address during regional Rice Production as southern gentle slope.
Utility model content
The purpose of this utility model with being to provide a kind of gentle slope paddy field drainage recycle with nitrogen phosphorus step diafiltration interception go
Except system, the utility model easy construction, quantities is small, intercepts removal with good nitrogen and phosphorus pollutantses and liquid manure step is efficient
Utilizing status, to improving China agricultural water water quality, with improving south China gentle slope regional liquid manure resource circulation utilization efficiency and
Water and soil conservation ability, alleviates Eutrophication Status and is significant.
The purpose of this utility model with being to provide a kind of gentle slope paddy field drainage recycle with nitrogen phosphorus step diafiltration interception go
Except system, including irrigation of paddy fields filtration system, raceway groove nitrogen phosphorus intercept removal system, step agricultural drain recharge and utilize system, the pool
Weir retaining ecological wetland treatment system.
The trench at different levels such as diversion, water delivery, water distribution, retaining, the water-break in rice field in the irrigation of paddy fields filtration system bag irrigated area
Or pipeline, and corresponding building and facility.The lattice field 150~200m of length in rice field, wide 70~80m, ridge double as field management
Road, ridge top width 50cm highly adds to 35cm, reduces runoff loss.Rice field subsurface wastewater infiltration system：Embedded caliber 60 ~ 70mm ripples
Line plastic tube hidden pipe, lapping adds crop material for geotextiles, and the plastic hidden pipe depth of burying is 0.9 ~ 1.1m of below ground,
Should be able to be met away from the top rake for 15 ~ 30m, hidden pipe do not rushed in pipe non-silting velocity requirement.
The raceway groove nitrogen phosphorus intercepts removal system, is that rice field land drainage is imported into edge by rice check field face delivery port
The sub-lateral drainage ditch of contour arrangement, farm ditch side slope sets permeable after using ecological vegetation type haydite pervious concrete plate lining cutting, plate
Geotextiles and the straw bed course that thickness is 1cm, are constituted with the raceway groove filtration system for intercepting removal agricultural surface runoff nitrogen phosphorus, row
Water farm ditch bottom of trench exports 20-25cm less than hidden pipe, and bottom of trench 35 ~ 40cm of width, slope coefficient is more than 1.0.Rice field perpendicular to etc.
The location arrangements lateral drainage ditch of high line, the water of field sub-lateral drainage ditch discharges at different levels imports lateral drainage ditch, it is considered to economic factor, draining
Bucket ditch is not required to carry out filtration process.
The step agricultural drain recharge utilizes system, eminence when referring to irrigate（Higher level）Paddy field drainage passes through on ridge
Control scupper enters lower（Subordinate）Rice field is recycled, and the rainwater that can not be put aside per one-level rice field during rainfall is directly by rice field
Plastic hidden pipe delivery port imports filter drain farm ditch, then is discharged through lateral drainage ditch, so that rice field is high with making full use of southern gentle slope
The special topography condition of difference, forms rice field runoff and utilizes system with the interception of nitrogen phosphorus step.
The small reservoir retaining ecological wetland treatment system, refers to utilize the river embankment positioned at the low-lying place in irrigated area, containing is by farmland
The runoff of remittance, the general 2 ~ 3m of river embankment depth, river embankment side slope uses fir pile ecological protection, and bank slope plantation woody plant constitutes water
Soil keeps ecological protection band, and river embankment bank water surface planting water plant, water plant area is less than the 1/3 of water surface area, passed through
Phytobiocoenose builds river embankment ecological wetland system, further intercepts nitrogen phosphorus substance in the agricultural drain for removing and, purifies water.It is logical
Setting irrigation by pumping pumping plant is crossed at river embankment, by water pumping irrigation system recharge agricultural drain, accomplishes that busy fills field, idle is to slope
The small reservoir moisturizing of ground eminence, realizes recycling for agricultural drain, while ensureing that ecological wetland river embankment discharges water to subordinate river lake
The water quality of body, control and mitigation agricultural non -point pollution.
Further, draining control valve is set at the sub-lateral drainage ditch outlet of every one-level field, the entrance and exit of small reservoir,
, can also in the crop growth stage in order in time discharge farmland excessive moisture before very heavy rains or when run-off is larger
By adjusting and controlling dead time of the water inside farmland, the purpose for reducing displacement and making full use of nitrogen phosphorus is realized.
Further, the sub-lateral drainage ditch side slope upper end should plant the draft plant that Bermuda grass or Festuca Arundinacea etc. conserve water and soil
Thing, during to prevent heavy rain or larger runoff, soil erosion is into raceway groove.
Further, the lateral drainage ditch is connected with small reservoir by crossing water culvert, if raceway groove is approached with road elevation,
Inverted-siphon principle can be borrowed and cross water.
Compared with prior art, the utility model has the advantages that：
First, the utility model makes full use of the natural discrepancy in elevation in hillside fields, constitutes paddy field drainage step and intercepts utilization；
Second, the utility model utilizes the superior and the subordinate's drainage channel height of water, constitutes filter drain raceway groove agricultural run-off nitrogen
Phosphorus step, which is intercepted, to be removed；
3rd, the utility model is buffered by rice field lattice field-rice field filtration system-raceway groove filtration system-river embankment ecology
Paddy field drainage is recycled and nitrogen phosphorus step band-river embankment ecological wetland system-water pumping irrigation system with further constituting gentle slope
Intercept removal system.
4th, the utility model is based on the regional existing high standard farmland water conservancy works in gentle slope ground, suitably transform with it is excellent
Change, easy construction, quantities is small, high degree reduction this area's agricultural run-off nitrogen phosphorus intercepts the cost removed.
Brief description of the drawings
Fig. 1 be the utility model gentle slope paddy field drainage recycle to be percolated with nitrogen phosphorus step and intercept the flat of removal technology
Face schematic diagram；
Fig. 2 be the utility model gentle slope paddy field drainage recycle with nitrogen phosphorus step be percolated intercept removal technology solid
Structural representation；
Fig. 3 be the utility model gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal technology in raceway groove
Nitrogen phosphorus intercepts the schematic cross-sectional view of removal system；
In figure：1 subsurface wastewater infiltration system, 2 sub-lateral drainage ditches, 3 draining recharges utilize system, 4 small reservoirs, 5 control scuppers, 6 rows
Water control valve, 7 agricultural tractor-ploughing bridges, 8 ridges, 9 roads, 10 irrigation by pumping pumping plants, 11 haydite pervious concrete plates, 12 drain combinations
Bed course, 13 lateral drainage ditches.
Embodiment
As Figure 1-3, a kind of gentle slope paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, including
Irrigation of paddy fields filtration system, raceway groove nitrogen phosphorus intercept removal system, step agricultural drain recharge and utilize system 3, small reservoir retaining ecology
Wet land treating system 4.
First with southern gentle slope ground have the special topography condition of the discrepancy in elevation, fields at different levels are separated to form natural-drop
The distribution of step shape, the trench at different levels such as basic water conservancy projects, including diversion, water delivery, water distribution, retaining, water-break are set in rice field
Or pipeline, and corresponding building and facility.Wherein, the lattice field 150~200m of length in rice field, wide 70~80m, ridge 8 double as field
Between management road, ridge top width 50cm, height 35cm.Ridge 8 is provided with control scupper 5.Embedded underground is used as subsurface infiltration system
The caliber of system 1 is 60-70cm corrugation plastic underground hidden pipe, and the permeable geotextiles of outer wrap add straw, and the depth of burying is
Ground is 0.9-1.1m, spacing 15-30m.
Then sub-lateral drainage ditch 2 is arranged along contour in rice field, nitrogen phosphorus is carried out in the drainage channel and intercepts removal processing, if
Bottom of slope width 35-40cm is put, slope coefficient is more than 1.0, and raceway groove side slope is served as a contrast using ecological vegetation type haydite pervious concrete plate 11
Build, it is 1cm straw bed course that permeable geotextiles and thickness are set after plate（That is drain combination bed course 12）, and in sub-lateral drainage ditch side slope
The herbaceous plant that upper end plantation Bermuda grass or Festuca Arundinacea etc. conserve water and soil, constitutes and removes agricultural surface runoff nitrogen phosphorus with interception
Raceway groove filtration system, sub-lateral drainage ditch bottom of trench exports 20-25cm less than hidden pipe.
Again in the vertical contour arrangement lateral drainage ditch in rice field, eminence during irrigation（Higher level）Paddy field drainage passes through the control on ridge
Scupper processed enters lower（Subordinate）Rice field is recycled, and the rainwater that can not be put aside per one-level rice field during rainfall is directly moulded by rice field
Expect that hidden pipe delivery port imports filter drain farm ditch, then discharged through lateral drainage ditch 13；In the sub-lateral drainage ditch exit of every one-level field
Draining control valve 6 is set.Consider economic factor, lateral drainage ditch 13 is not required to carry out filtration process, is set at the middle part of lateral drainage ditch 13
Small farm tractor-ploughing bridge 7, width 2.5m.Small reservoir 4, small reservoir near the lateral drainage ditch tail end of raceway groove are percolated using afterbody field
Scale arranged according to agricultural drain amount size, small reservoir exit sets draining to control building, and small reservoir central depths are
2-3m, depending on shape is according to pre-existing topography.Lateral drainage ditch is connected with small reservoir by crossing water culvert, if lateral drainage ditch and road
9 elevations are approached, and can be borrowed inverted-siphon principle and be crossed water.River embankment side slope uses fir pile ecological protection, bank slope plantation woody plant structure
Into soil and water conservation ecological buffer zone, river embankment bank water surface planting water plant, water plant area is less than the 1/3 of water surface area,
River embankment ecological wetland system is built by phytobiocoenose, nitrogen phosphorus substance, purified water in the agricultural drain for removing and further is intercepted
Matter.And irrigation by pumping pumping plant 10 is set up at small reservoir, and by water pumping irrigation system recharge agricultural drain, accomplish that busy fills field, it is not busy
When to hillside fields eminence small reservoir moisturizing, realize recycling for agricultural drain.Finally by rice field through irrigation of paddy fields filtration system,
Raceway groove nitrogen phosphorus intercepts removal system, step agricultural drain recharge and utilizes the multistages such as system, small reservoir retaining ecological wetland treatment system
The unnecessary water of step processing is poured into nature river course.
The utility model can be constructed on the basis of original network of waterways and irrigation system, and easy construction, quantities is small, tool
There are good nitrogen and phosphorus pollutantses to intercept to remove and the efficient utilizing status of liquid manure step, be favorably improved the regional water in south China gentle slope
Fertile resource utilization ratio and water and soil conservation ability, while improving agricultural water water quality, the hydrology for enhancing rice field is regulated and stored and life
State child care function, is significant to alleviating Eutrophication Status.
Claims (6)
1. gentle slope paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, include some grades of rice fields of the discrepancy in elevation
Irrigation of paddy fields filtration system is set on lattice field, rice field lattice field, it is characterized in that, blocked provided with rice field subsurface wastewater infiltration system, raceway groove nitrogen phosphorus
Clip except system, small reservoir retaining ecological wetland treatment system；
Rice field lattice field 150~200m of length, wide 70~80m described in per one-level, ridge is set per one-level rice field Ge Tian one end, each
The level rice field lattice field other end sets the raceway groove nitrogen phosphorus to intercept removal system；Ridge doubles as field management road, ridge top width
50cm, ridge height 35cm；
Some caliber 60 ~ 70mm waved plastic pipe hidden pipes are buried described in per one-level in the lattice field of rice field, the rice field underground is formed
Filtration system, plastic hidden pipe lapping adds crop material for geotextiles, the plastic hidden pipe depth of burying be below ground 0.9 ~
1.1m, spacing is 15 ~ 30m；
The permeable soil set from inside to outside in sub-lateral drainage ditch, sub-lateral drainage ditch side slope is arranged in rice field lattice field along contour described in per one-level
Work cloth, straw bed course and haydite pervious concrete plate, form raceway groove nitrogen phosphorus and intercept removal system；Upper level height rice field lattice field
Sub-lateral drainage ditch is adjacent with the ridge in next stage height rice field lattice field and be arranged in parallel, and sub-lateral drainage ditch is arranged on the plastic hidden pipe and gone out
At mouthful, sub-lateral drainage ditch bottom of trench is exported less than the plastic hidden pipe, and sub-lateral drainage ditch is used for the rice for importing rice field lattice field face delivery port
Field land drainage；The lattice field draining of higher level rice field enters subordinate rice field lattice field again by the control scupper set on ridge during irrigation
Utilize, the rainwater that can not be put aside per one-level rice field lattice field during rainfall directly imports draining agriculture by rice field plastic hidden pipe delivery port
Ditch, then discharged through lateral drainage ditch, form step agricultural drain recharge and utilize system, lateral drainage ditch is set perpendicular to contour；
The river embankment positioned at the low-lying place in irrigated area is utilized near the tail end of lateral drainage ditch, the runoff that containing is imported by farmland forms institute
State small reservoir retaining ecological wetland treatment system；Irrigation by pumping pumping plant is set at small reservoir 2 ~ 3m of depth, small reservoir.
2. gentle slope according to claim 1 paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, its
It is characterized in, the sub-lateral drainage ditch bottom of slope width 35-40cm that sub-lateral drainage ditch slope coefficient is more than 1.0, the thickness of straw bed course is
1cm, sub-lateral drainage ditch bottom of trench exports 20-25cm, and setting small farm tractor-ploughing bridge, agriculture in the middle part of lateral drainage ditch less than the hidden pipe
With tractor-ploughing bridge width 2.5m.
3. gentle slope according to claim 1 or 2 paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system,
It is characterized in that, it is described that draining control valve is set at the sub-lateral drainage ditch outlet in every one-level rice field lattice field, the entrance and exit of small reservoir.
4. gentle slope according to claim 3 paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, its
It is characterized in, the sub-lateral drainage ditch side slope upper end plantation Bermuda grass or Festuca Arundinacea.
5. gentle slope according to claim 4 paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, its
It is characterized in that the lateral drainage ditch is connected with small reservoir by crossing water culvert；Or if raceway groove is approached with road elevation, drain bucket
Ditch borrows inverted-siphon principle with small reservoir and crosses water.
6. gentle slope according to claim 5 paddy field drainage recycle with nitrogen phosphorus step diafiltration intercept removal system, its
It is characterized in that the small reservoir side slope uses fir pile ecological protection, small reservoir bank slope plantation woody plant constitutes soil and water conservation ecological and prevented
Protecting band, small reservoir bank water surface planting water plant, water plant area is less than the 1/3 of water surface area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169606.9U CN206337082U (en) | 2016-10-26 | 2016-10-26 | Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169606.9U CN206337082U (en) | 2016-10-26 | 2016-10-26 | Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206337082U true CN206337082U (en) | 2017-07-18 |
Family
ID=59299180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621169606.9U Expired - Fee Related CN206337082U (en) | 2016-10-26 | 2016-10-26 | Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206337082U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365320A (en) * | 2016-10-26 | 2017-02-01 | 扬州大学 | Drained water recycling and nitrogen and phosphorus cascaded percolation, blocking and removal system for paddy field on southern gentle slope land and application method of system |
| CN107368108A (en) * | 2017-07-24 | 2017-11-21 | 中国科学院测量与地球物理研究所 | The method of field ditch pool integration combined regulating rice field pollution of area source |
| CN113853865A (en) * | 2021-09-27 | 2021-12-31 | 宁波市农业科学研究院 | Drainage system for digesting nitrogen and phosphorus by utilizing sloping field terrain and plants and construction method thereof |
-
2016
- 2016-10-26 CN CN201621169606.9U patent/CN206337082U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365320A (en) * | 2016-10-26 | 2017-02-01 | 扬州大学 | Drained water recycling and nitrogen and phosphorus cascaded percolation, blocking and removal system for paddy field on southern gentle slope land and application method of system |
| CN107368108A (en) * | 2017-07-24 | 2017-11-21 | 中国科学院测量与地球物理研究所 | The method of field ditch pool integration combined regulating rice field pollution of area source |
| CN113853865A (en) * | 2021-09-27 | 2021-12-31 | 宁波市农业科学研究院 | Drainage system for digesting nitrogen and phosphorus by utilizing sloping field terrain and plants and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103588303B (en) | Ecological check dam prevention and control system for three gorges reservoir region hilly land ravine agricultural non-point source pollution | |
| CN106365320A (en) | Drained water recycling and nitrogen and phosphorus cascaded percolation, blocking and removal system for paddy field on southern gentle slope land and application method of system | |
| CN211057960U (en) | Stepped rainwater storage and purification ecological retention system | |
| CN105464050B (en) | Renewable filler-plant society formula irrigation canals and ditches-bank protection nitrogen phosphorus ecological intercepting system | |
| CN206089200U (en) | Farmland benthophyte ecological ditch canal | |
| CN209429048U (en) | One kind being suitable for Mountainous Area in North China karez formula underground and catchments water delivery water storage gallery | |
| CN206337082U (en) | Gentle slope paddy field drainage recycle and nitrogen phosphorus step diafiltration intercept removal system | |
| CN203021406U (en) | Multistep submerged dam eco-purification channel system for farmland non-point source pollution | |
| CN102926362B (en) | Pollution control and emission reduction method for farmland drainage | |
| CN102603075A (en) | Grass stream ecological corridor facility for collecting and treating rainwater at shores of river and lake | |
| CN109958099B (en) | Urban river channel rain and flood resource regulation and control system | |
| CN108328744B (en) | Three-stage ecological pond for treating farmland non-point source pollution based on sponge ecological system | |
| CN109183532A (en) | A kind of north city rainwater purification depending on road is regulated and stored ecological utilization system | |
| CN2866592Y (en) | Irrigation canals and ditches type wet land bed | |
| CN218478616U (en) | Water quality purification system for farmland ecological ditch | |
| CN209941826U (en) | Green land rainwater collecting and recycling pipe network based on undulating terrain condition | |
| CN209194665U (en) | Cell storm sewer exhaust system | |
| CN113374026A (en) | Southwest hilly area sloping field area ditch rainwater is collected and is recycled system | |
| CN206070498U (en) | A kind of farmland submerged plant ecological canal for processing early-stage rainwater | |
| CN205348113U (en) | Ecological interception system of filler - plant society formula irrigation canals and ditches - bank protection nitrogen phosphorus of can regenerating | |
| CN213952092U (en) | Cascaded soil and water conservation ecological slope protection structure | |
| CN213014554U (en) | Drainage system is held in mountain park rainfall flood management | |
| CN212506609U (en) | Sponge city oozes row structure | |
| CN108557988A (en) | A kind of the dryland soil filtration system and method for agricultural non-point source pollution control | |
| CN210886810U (en) | Hillock district collection rain retaining road system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170718 Termination date: 20211026 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |