CN103232139B - Method and system for treating sewage by using bound strengthened tidal stream artificial wetland - Google Patents
Method and system for treating sewage by using bound strengthened tidal stream artificial wetland Download PDFInfo
- Publication number
- CN103232139B CN103232139B CN201310146042.1A CN201310146042A CN103232139B CN 103232139 B CN103232139 B CN 103232139B CN 201310146042 A CN201310146042 A CN 201310146042A CN 103232139 B CN103232139 B CN 103232139B
- Authority
- CN
- China
- Prior art keywords
- wetland
- bed body
- anaerobic
- water
- water distributor
- 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
Images
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention belongs to the field of sewage treatment, and relates to a method and system for treating sewage by using a bound strengthened tidal stream artificial wetland. The system comprises a bound strengthened aerobic wetland bed body (10) and a carbon source replenishing type anaerobic wetland bed body (11), wherein the aerobic wetland bed body (10) consists of a plurality of small tidal stream artificial wetland columns and gaps, and is connected with a pretreatment unit (1) through a water distributing pipe (5); a water distributing pipe (6) is arranged at a water inlet part of the anaerobic wetland bed body (11), and a water distributing pressure divider (7) is arranged in the water distributing pipe (6) and is communicated with the pretreatment unit (1); and a siphon drain pipe (13) is arranged at a water outlet part of the system, and the height of the outlet is equal to that of a permanent submerged liquid level (12). The invention provides the method and system for treating the sewage by using the bound strengthened tidal stream artificial wetland to solve the problems that the tidal stream artificial wetland has shot stream phenomena in practical application, the bed body is poor in removal effect on nitrate and the like.
Description
Technical field
The invention belongs to sewage treatment area, be specifically related to cluster strengthening tidal flow artificial wetland sewage water treatment method and system.
Background technology
In recent years, along with improving constantly of economic fast development and living standards of the people, quantity of wastewater effluent also constantly increases thereupon, China's body eutrophication and ambient water quality is worsened and be on the rise.At present, the sewage disposal of China mainly depends on traditional centralized water technology, although technology and technique are day by day ripe and perfect, but face the too high problem of Construction and operation cost, many economically underdeveloped areas can not build large-scale wastewater treatment plant at all or many built sewage works are but also on the shelf because of moving funds shortage, make China only have 24% trade effluent and 4% sanitary sewage to enter water body through processing.Especially for China vast Rural areas backward in economy, sewage discharge source of pollution disperse, the network of drains that does not concentrate most Rural areass, peopleware is relatively low, and the investment of traditional municipal sewage plant is large, running cost is high, need to there are the technical controller of certain quality, be not suitable for applying in Rural areas.Therefore, for further promoting the construction process and the Sustainable development that ensures Ecological Environment in the new rural area of Chinese society doctrine, according to features such as the backward in economy and source of sewage dispersions in Rural areas, the country sewage purification techniques of develop simple and easy to do, efficient economy, beautify the environment, distributing being processed is on the spot most important.
Constructed wetland waste water treatment technology is a kind of ecological sewage purification techniques with controllability and through engineering approaches feature that is artificially designed and built by simulating nature wetland that 20 century 70s grow up, and the feature such as, good purification low with its less investment, construction operation cost has been subject to extensive concern in recent years.It is applied gradually by the processing of conventional sanitary sewage, expands to gradually the processing of various wastewater such as processing farmland storm runoff, food processing wastewater, acid wastewater in mine, livestock breeding wastewater and percolate.The purification of sewage in artificial wet land system mainly worked in coordination with by physics, chemistry and biological action with matrix, plant and microorganism.
This kind of ecological wastewater processing pattern is applicable to China's national situation, in the sewage disposal of rural area and Small Urban, has broad application prospects.Although but traditional artificial swamp can reach more than 80% clearance to COD, BOD, but its floor space is large, hydraulic detention time is long, thereby cause processing efficiency low, the processing efficiency that therefore how to improve artificial swamp becomes the artificial swamp focus of research at present.Last century the nineties, Birmingham, GBR university has proposed tidal flow artificial wetland system first, as a kind of novel artificial swamp form, the meeting of variation up and down of its saturated saturated surface of wetland bed body weight in operational process forces atmosphericoxygen in the matrix space that sucks bed body, thereby largely, improve wetland bed oxygen transmission quantity, therefore can greatly promote the wetland bed removal efficiency to organism and ammonia nitrogen.But at present to the research many places of tidal flow artificial wetland in experimental scale, trial model column internal diameter is mostly less than 30cm, while merely the expansion of tidal flow artificial wetland post being applied to real life processing, can cause and flood and the short flow phenomenon of the wetland bed appearance of empty stage, current non-perpendicular state in partial area flows, thereby cause overall wetland reoxygenation ability to reduce, the processing efficiency of organism and ammonia nitrogen declines.Simultaneously, although the good reoxygenation ability of tidal flow artificial wetland can be strengthened the generation of nitrifying process, make ammonia nitrogen farthest be oxidized to nitric nitrogen, but this aerobic environment has but suppressed the generation of denitrification process, make the nitric nitrogen of enriched in wetland bed system water outlet, directly limit thoroughly removing of total nitrogen, affected the water quality of water outlet.In addition, artificial swamp mainly relies on microbial process to the removal of organism and nitrogen, and microorganism active is with the differing greatly of season and temperature variation, and makes affected by seasonal variation on the removal of organism and nitrogen in wastewater treatment process larger.
Summary of the invention
The method of cluster strengthening tidal flow artificial wetland sewage disposal adopts morning and evening tides operation scheme, each cycle of operation comprises waterflooding reaction and two stages of emptying reoxygenation, each week, initial water inlet adopted the aerobic/anaerobic water distributor control that is subject to the control of water distribution voltage-divider, make raw waste water first enter the wetland bed body of anaerobism, for providing sufficient carbon source to carry out denitrification, the sewage that contains a large amount of nitrate removes, when sewage is full of after anaerobic bed body, raw waste water enters wetland bed body by aerobic bed water distributor again, unsaturated seepage from top to bottom after wetland surface uniform distributes, with the good zeolite of absorption property in wetland bed body, boiler ash sediment, the Wetland Substrate such as vermiculite or haydite fully contacts.
The draining in each end of term in week realizes by siphon drainage pipe, make the water port height of siphon drainage pipe identical with the permanent flooding area of anaerobic bed body liquid level, guarantee that wetland bed system bottom exists an anaerobic zone that is conducive to denitrification, the existence and the breeding that can be denitrification flora provide good envrionment conditions, and the nitrate-nitrogen reduction that aerobic top ecosphere nitration reaction is generated is nitrogen and then release.
The aerobic wetland bed body of cluster strengthening is made up of some little tidal flow artificial wetland posts, the gap of each little tidal flow artificial wetland post and cylinder all can form the independently wetland bed body of tide current, avoid the appearance of short flow phenomenon, solve merely traditional tidal flow artificial wetland has been expanded to the local reoxygenation anergy causing, strengthen large-scale tidal flow artificial wetland reoxygenation ability, thereby further improved sewage treatment capacity.
The cluster strengthening tidal flow artificial wetland Sewage treatment systems that realizes aforesaid method comprises pretreatment unit 1, filter screen 2, settling tank 3, pump sump 4, aerobic bed water distributor 5, anaerobic bed water distributor 6, water distribution voltage-divider 7, wetland plant 8, biomass thermal insulation layer 9, the aerobic wetland bed body 10 of cluster strengthening, the wetland bed body 11 of supplementary carbon source type anaerobism flushes liquid level 12, siphon drainage pipe 13 etc. with siphon drainage pipe outlet.Sewage flows into pretreatment unit 1 by source of sewage, after filter screen 2 and settling tank 3 pre-treatment, flow into pump sump, enter wetland bed body by water distributor again, when tidal flow artificial wetland liquid level is increased to behind top gradually, by siphon drainage pipe 13, discharge tide current is wetland bed rapidly for sewage, the water port height of siphon drainage pipe 13 is identical with the permanent flooding area of anaerobic bed body liquid level, when sewage in wetland bed body stops after being down to liquid level 12, the following part of liquid level is permanent waterflooding district, is conducive to denitrifying bacterium growth.Water distributor 6 is subject to the automatic adjusting of water distribution voltage-divider 7, water distributor 6 and pump sump 4 connection portion sectional areas are less than water distributor and pass into the sectional area of wetland inside, water distribution voltage-divider 7 favours water distributor 6 sectional area variations place, the little place of one end and sectional area water distributor is by seamless chain connection, the other end stretches into sectional area larger part, under state of nature, water distribution voltage-divider 7 is close to water distributor 6 sectional area variations place under action of gravity, water distributor 6 can be blocked, after System drainage finishes, in the wetland bed body 11 of supplementary carbon source type anaerobism, liquid level reaches behind liquid level 12 places, because the effect of pressure difference, sewage first can be from pump sump by water distributor 6, press off water distribution voltage-divider 7, flow into the wetland bed body 11 of supplementary carbon source type anaerobism and carry out anti-nitration reaction for the sewage that contains a large amount of nitrate provides sufficient carbon source, when rising to more than 12, bed body fluid face produces after relative liquid surface height, water distributor 6 middle sections are amassed and are gone out more greatly the pressure that the pressure of water distribution voltage-divider 7 is produced higher than the less direction of sectional area, water distribution voltage-divider 7 will be close to water distributor 6 sectional area variations place, water distributor 6 is blocked and makes wetland bed body 11 water inlet ends of supplementary carbon source type anaerobism, water distribution voltage-divider 7 and water distributor 6 sectional areas change and can calculate according to the amount of wastewater pollutants content feature and supply carbon source.After liquid level in pump sump rises to aerobic bed water distributor 5, sewage enters the biomass thermal insulation layer 9 on cluster strengthening aerobic wetland bed body 10 surfaces by aerobic bed water distributor 5, sewage can utilize the uniform space of matrix to distribute uniformly, then from wetland surface uniform unsaturated seepage from top to bottom, fully contact with the Wetland Substrate such as the good zeolite of absorption property, boiler ash sediment, vermiculite or haydite in the aerobic wetland bed body 10 of cluster strengthening.The aerobic wetland bed body 10 of cluster strengthening is made up of several little tidal flow artificial wetland posts, the gap of each little tidal flow artificial wetland post and cylinder all can form the independently wetland bed body of tide current, solve and merely traditional tidal flow artificial wetland is expanded to the local reoxygenation anergy causing, avoid the appearance of short flow phenomenon, strengthen large-scale tidal flow artificial wetland reoxygenation ability, thereby further improved sewage treatment capacity.Compared with prior art,
Beneficial effect of the present invention is:
(1) in the present invention, in system water distributor system, be provided with water distribution voltage-divider 7, realize each fill phase and first supplemented the operation scheme of quantitative carbon source for the wetland bed body 11 of supplementary carbon source type anaerobism, after water distribution voltage-divider 7 and water distributor 6 sectional areas variation designs are determined, the amount that at every turn enters the raw waste water of anaerobic bed 11 can, according to pollutent property calculation in raw waste water, realize adjusting by the height that changes siphon drainage pipe 13 water port.Can significantly improve the clearance of nitrate from waste water and total nitrogen, thereby be conducive to the decontamination effect improving of sewage.
(2) in the present invention, adopt non-power automatic drainer, it adopts siphon drainage pipe 13 to realize the morning and evening tides operation scheme of " moment draining ", in the design of siphon drainage pipe 13, the water port height of siphon drainage pipe 13 is identical with the permanent flooding area of anaerobic bed body liquid level, guarantee that wetland bed system bottom exists an anaerobic zone that is conducive to denitrification, atmospheric diffusion reoxygenation ability, the existence and the breeding that can be denitrification flora provide good envrionment conditions, and the nitrate-nitrogen reduction that aerobic top ecosphere nitration reaction is generated is nitrogen and then release.
(3) in the present invention, the aerobic wetland bed body 10 of cluster strengthening is made up of several little tidal flow artificial wetland posts, the gap of each little tidal flow artificial wetland post and cylinder all can form the independently wetland bed body of tide current, avoid the appearance of the short-and-medium stream of water flow process, solve and merely traditional tidal flow artificial wetland is expanded to the local reoxygenation anergy causing, strengthen large-scale tidal flow artificial wetland reoxygenation ability, thereby further improved sewage treatment capacity.
(4), in the present invention, a bed surface biomass thermal insulation layer 9 is selected the matrix such as the good wood chip of heat insulation effect, fine sand, and select that biomass is large, growth velocity is high and winter easily Medulla Junci, reed, cattail, calamus and the Herba Cyperi Glomerati etc. of lodging as wetland plant 8.Enhanced system cold tolerance, maintains its steady running under cold condition.
Accompanying drawing explanation:
Fig. 1 is the sectional view of this cluster strengthening tidal flow artificial wetland Sewage treatment systems, the aerobic wetland bed and water distributor orthographic plan of cluster strengthening that Fig. 2 is system.
Reference numeral:
1: pretreatment unit; 2: filter screen;
3: settling tank; 4: pump sump;
5: aerobic bed water distributor; 6: anaerobic bed water distributor;
7: water distribution voltage-divider; 8: wetland plant;
9: biomass thermal insulation layer; 10: the aerobic wetland bed body of cluster strengthening;
11: the wetland bed body of supplementary carbon source type anaerobism; 12; Flush liquid level with siphon drainage pipe outlet;
13: siphon drainage pipe.
Embodiment:
Below in conjunction with accompanying drawing and mark, further describe the present invention.
Sewage flows into pretreatment unit 1 by source of sewage, through filter screen 2 and settling tank 3 filter and precipitate pre-treatment after flow into pump sump, then enter wetland bed body by water distributor.Water distributor 5 and 6 is subject to the automatic adjusting of water distribution voltage-divider 7, first raw waste water can directly enter the wetland bed body 11 of supplementary carbon source type anaerobism by anaerobic bed water distributor 6, for providing sufficient carbon source, the sewage that contains a large amount of nitrate carries out anti-nitration reaction, when bed body sewage reaches after the above certain altitude of liquid level 12, raw waste water enters wetland bed body by aerobic bed water distributor 6, unsaturated seepage from top to bottom after wetland surface uniform distributes, with the good zeolite of absorption property in the aerobic wetland bed body 10 of cluster strengthening, boiler ash sediment, the Wetland Substrate such as vermiculite or haydite fully contacts.The aerobic wetland bed body 10 of cluster strengthening is made up of some little tidal flow artificial wetland posts, the gap of each little tidal flow artificial wetland post and cylinder all can form the independently wetland bed body of tide current, solve and merely traditional tidal flow artificial wetland is expanded to the local reoxygenation anergy causing, avoid the appearance of short stream, strengthen large-scale tidal flow artificial wetland reoxygenation ability, thereby further improved sewage treatment capacity.When tidal flow artificial wetland liquid level is increased to behind top gradually, it is wetland bed that sewage is discharged rapidly tide current by siphon drainage pipe, the water port height of siphon drainage pipe 13 is identical with the permanent flooding area of anaerobic bed body liquid level, when sewage in wetland bed body stops after being down to liquid level 12, the following part of liquid level is permanent waterflooding district, keep anaerobic state, for the removal of nitrate and the growth of denitrifying bacterium provide favourable condition.
Claims (4)
1. cluster strengthening tidal flow artificial wetland Sewage treatment systems, it is characterized in that: this system comprises the aerobic wetland bed body of cluster strengthening (10) and the wetland bed body of supplementary carbon source type anaerobism (11), wherein the cluster aerobic wetland bed body of strengthening (10) is made up of some little tidal flow artificial wetland posts and gap, its top is laid biomass thermal insulation layers (9) and is planted wetland plant (8), and the aerobic bed water distributor (5) by water distribution uniformity is connected with pump sump (4) in pretreatment unit (1), the wetland bed body of supplementary carbon source type anaerobism (11) water inlet is provided with anaerobic bed water distributor (6) and inside and arranges and forever flood and flush liquid level (12) with siphon drainage pipe outlet, water distribution voltage-divider (7) is set in anaerobic bed water distributor (6) and is connected with pump sump (4) in pretreatment unit (1), anaerobic bed water distributor (6) and pump sump (4) connection portion sectional area are less than anaerobic bed water distributor (6) and pass into the sectional area of wetland inside, water distribution voltage-divider (7) favours anaerobic bed water distributor (6) sectional area variation place, the little place of one end and sectional area anaerobic bed water distributor (6) is by seamless chain connection, the other end stretches into sectional area larger part, system water outlet place is provided with siphon drainage pipe (13), siphon drainage pipe (13) goes out open height and in the wetland bed body of supplementary carbon source type anaerobism (11), forever to flood liquid level (12) identical.
2. the system as claimed in claim 1, is characterized in that: the wetland bed body of described supplementary carbon source type anaerobism (11) top anaerobic bed water distributor (6) is provided with water distribution voltage-divider (7).
3. the system as claimed in claim 1, is characterized in that: in the wetland bed body of described supplementary carbon source type anaerobism (11), arrange and forever flood and flush liquid level (12) with siphon drainage pipe outlet, formed the permanent anaerobic zone in system.
4. the system as claimed in claim 1, is characterized in that: described cluster strengthening aerobic wetland bed body (10) top is laid the biomass thermal insulation layer (9) being made up of the good wood chip of heat insulation effect or fine sand matrix and selected biomass is large, growth velocity is high and easily lodge winter reed, cattail, calamus and Herba Cyperi Glomerati as wetland plant (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146042.1A CN103232139B (en) | 2013-04-24 | 2013-04-24 | Method and system for treating sewage by using bound strengthened tidal stream artificial wetland |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310146042.1A CN103232139B (en) | 2013-04-24 | 2013-04-24 | Method and system for treating sewage by using bound strengthened tidal stream artificial wetland |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103232139A CN103232139A (en) | 2013-08-07 |
| CN103232139B true CN103232139B (en) | 2014-05-14 |
Family
ID=48880226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310146042.1A Expired - Fee Related CN103232139B (en) | 2013-04-24 | 2013-04-24 | Method and system for treating sewage by using bound strengthened tidal stream artificial wetland |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103232139B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104150703B (en) * | 2014-07-25 | 2015-10-28 | 中国环境科学研究院 | A kind of A/O type wetland Treated sewage reusing device and sewage water treatment method |
| CN106745758B (en) * | 2017-04-05 | 2023-05-12 | 江西省科学院能源研究所 | Siphon type ecological pond |
| CN110330109A (en) * | 2019-07-30 | 2019-10-15 | 台州学院 | A kind of A/O type tidal flow artificial wetland of autonomous operation |
| CN113979546A (en) * | 2021-11-25 | 2022-01-28 | 重庆大学 | Tidal flow regulated and controlled magnetite constructed wetland |
| CN114906936A (en) * | 2022-06-22 | 2022-08-16 | 重庆大学溧阳智慧城市研究院 | Operation method of greenhouse gas emission reduction vertical flow constructed wetland system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998058881A1 (en) * | 1997-06-23 | 1998-12-30 | Wallace Scott D | Method and apparatus for biological treatment of waste water |
| JP2008068211A (en) * | 2006-09-14 | 2008-03-27 | National Agriculture & Food Research Organization | Underflow-type constructed wetland system |
| CN101671092A (en) * | 2009-10-12 | 2010-03-17 | 中国农业大学 | Sewage treatment system and method for combined tidal flow artificial wetland |
| CN102942293A (en) * | 2012-12-06 | 2013-02-27 | 中国农业大学 | Tidal current wetland coupled electrochemical reinforced denitrification and dephosphorization method and system |
| CN102974220A (en) * | 2012-12-13 | 2013-03-20 | 云南玮昊能源发展有限公司 | Three-cylinder reverse osmosis seawater desalting and concentrated seawater energy recycling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6896805B2 (en) * | 2003-10-20 | 2005-05-24 | Dharma Living Systems, Inc. | Tidal vertical flow wastewater treatment system and method |
-
2013
- 2013-04-24 CN CN201310146042.1A patent/CN103232139B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998058881A1 (en) * | 1997-06-23 | 1998-12-30 | Wallace Scott D | Method and apparatus for biological treatment of waste water |
| JP2008068211A (en) * | 2006-09-14 | 2008-03-27 | National Agriculture & Food Research Organization | Underflow-type constructed wetland system |
| CN101671092A (en) * | 2009-10-12 | 2010-03-17 | 中国农业大学 | Sewage treatment system and method for combined tidal flow artificial wetland |
| CN102942293A (en) * | 2012-12-06 | 2013-02-27 | 中国农业大学 | Tidal current wetland coupled electrochemical reinforced denitrification and dephosphorization method and system |
| CN102974220A (en) * | 2012-12-13 | 2013-03-20 | 云南玮昊能源发展有限公司 | Three-cylinder reverse osmosis seawater desalting and concentrated seawater energy recycling system |
Non-Patent Citations (2)
| Title |
|---|
| 吴树彪 等.潮汐流人工湿地床处理生活污水的优化研究.《中国农业大学学报》.2010,第15卷(第2期),第106-113页. |
| 潮汐流人工湿地床处理生活污水的优化研究;吴树彪 等;《中国农业大学学报》;20101231;第15卷(第2期);第106-113页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103232139A (en) | 2013-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101671092B (en) | Sewage treatment system and method for combined tidal flow artificial wetland | |
| CN101538086B (en) | Power-free integrated constructed wetland waste water treatment technology | |
| CN102923861B (en) | Constructed wetland for treating sewage with low carbon nitrogen ratio by utilizing ores | |
| CN101885565B (en) | Hydraulic power oxygenation constructed wetland | |
| CN103232139B (en) | Method and system for treating sewage by using bound strengthened tidal stream artificial wetland | |
| CN202594913U (en) | Turn back flow type landscape composite artificial wetland sewage treatment system | |
| CN201952325U (en) | Stepwise function-reinforced biological ecological oxidation pond | |
| CN102260021A (en) | Process and device for deep denitrogenation of domestic wastewater without additional carbon source | |
| CN102351378A (en) | Method and system for processing rural sewage in artificial wetlands | |
| CN102336500B (en) | Rural domestic sewage treatment system suitable for northern part of China and technology thereof | |
| CN101817615A (en) | Anaerobic-sequencing batch biofilm reactor-artificial wetland method for treating piggery wastewater | |
| CN102942293A (en) | Tidal current wetland coupled electrochemical reinforced denitrification and dephosphorization method and system | |
| CN103936234B (en) | A kind of domestic sewage processing system and treatment process thereof utilizing sun power | |
| CN204474503U (en) | A kind of country sewage drips the ecological canal treatment system of filter | |
| CN102358676A (en) | Four-stage three-phase fluidized bed step-feed deep nitrogen removal system | |
| CN103833138A (en) | View tower type device for water aeration and biological purification, and purification method | |
| CN101973679A (en) | Distributed sewage treatment and regeneration technology | |
| CN203144245U (en) | Combined artificial wetland sewage treatment system suitable for medium and small towns | |
| CN107721101B (en) | Micro-power sewage integrated treatment equipment | |
| CN105347499A (en) | Method for absorbing tail water of municipal wastewater plant by immersed vertical flow artificial wetlands | |
| CN107352738B (en) | Composite artificial ecological bed sewage treatment system and method for enhancing nitrogen and phosphorus removal | |
| CN109111050A (en) | Solar energy microkinetic rural sewage treatment system | |
| CN102408175A (en) | System for ecologically utilizing household sewage | |
| CN101704586B (en) | Nesting mixed flow constructed wetland | |
| CN101767915B (en) | Method for treating land with domestic sewage at water-source forest land of mountain area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Dong Renjie Inventor after: Wu Shubiao Inventor after: Lv Tao Inventor after: Zhang Dongxiao Inventor after: Liu Fang Inventor before: Wu Shubiao Inventor before: Lv Tao Inventor before: Zhang Dongxiao Inventor before: Dong Renjie Inventor before: Liu Fang |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: WU SHUBIAO LV TAO ZHANG DONGXIAO DONG RENJIE LIU FANG TO: DONG RENJIE WU SHUBIAO LV TAO ZHANG DONGXIAO LIU FANG |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20150424 |
|
| EXPY | Termination of patent right or utility model |