CN108658231A - A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment carries device for mark - Google Patents
A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment carries device for mark Download PDFInfo
- Publication number
- CN108658231A CN108658231A CN201810247867.5A CN201810247867A CN108658231A CN 108658231 A CN108658231 A CN 108658231A CN 201810247867 A CN201810247867 A CN 201810247867A CN 108658231 A CN108658231 A CN 108658231A
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- Prior art keywords
- anaerobic room
- unpowered
- water inlet
- open type
- closed anaerobic
- Prior art date
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- 239000010865 sewage Substances 0.000 title claims abstract description 77
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000006213 oxygenation reaction Methods 0.000 claims abstract description 34
- 238000005273 aeration Methods 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 claims abstract description 15
- 241001148470 aerobic bacillus Species 0.000 claims abstract description 14
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000005868 electrolysis reaction Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000545237 Modeeria Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000009504 gantong Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 210000002429 large intestine Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- C02F3/30—Aerobic and anaerobic processes
-
- 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
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment carries device for mark,Including open type aerobic box,One upper lateral part of open type aerobic box is equipped with water inlet,The unpowered oxygenation water distributor coordinated with water inlet is equipped in open type aerobic box,The side lower part far from water inlet is equipped with closed anaerobic room in open type aerobic box,It is less than unpowered oxygenation water distributor at the top of closed anaerobic room,Unpowered aeration waterwheel equipment and unpowered oxygenation ditch plate are equipped at the top of closed anaerobic room successively,Unpowered aeration waterwheel equipment is positioned close to the side of water inlet,Closed anaerobic room is equipped with the anaerobic room water inlet pipe being connected to inside unpowered oxygenation ditch plate and closed anaerobic room,Closed anaerobic room side wall is equipped with water outlet,Aerobic bacteria is equipped in open type aerobic box,Anaerobic bacteria is equipped in closed anaerobic room,It has reasonable in design,It is inputted without power,Multistage increases sewage and aerobic bacteria contact area,It is at low cost,The advantages that sanitary sewage disposal effect is good.
Description
Technical field：
The present invention relates to technical field of sewage, and in particular to a kind of domestic sewage in rural areas based on three compartment septic tanks
Processing discharge carries device for mark.
Background technology：
Currently, the processing for domestic sewage in rural areas is mainly handled using three compartment septic tanks, three compartment septic tanks
Use certain effect is played to the processing of domestic sewage in rural areas, but it also rests on primary rank to the processing of sanitary sewage
Section, through three compartment septic tanks, treated that discharge standard is not achieved in sanitary sewage, can not recycle, and can also be to soil after discharging
Earth and ambient enviroment pollute.
It is well known that sewage can effectively improve wastewater treatment efficiency through Aerobic Process for Treatment again after Anaerobic Treatment.But it is existing
Aerobic bacteria processing mode need to note oxygen into sewage by the way that oxygen pump is continual, to keep oxygen concentration in sewage, this
Undoubtedly increase the cost of aerobic bacteria processing mode, cost is higher for rural area, heavy load, and villager is difficult to undertake, and causes
Rural area generally uses single anaerobic bacteria processing mode, the final treatment effect for influencing domestic sewage in rural areas.Therefore how to drop
By aerobic bacteria processing mode and anaerobic bacteria processing mode (three compartment septic tanks) phase under the premise of low aerobic bacteria processing mode cost
It is combined into the task of top priority for solving rural domestic sewage treatment.
Invention content：
The purpose of the present invention is exactly in order to make up for the deficiencies of the prior art, it is unpowered more to provide a kind of domestic sewage in rural areas
Grade aerobic treatment discharge carries device for mark, it have it is reasonable in design, without power input, multistage increase sewage and aerobic bacteria connects
The advantages that contacting surface is long-pending, at low cost, sanitary sewage disposal effect is good, solves problems of the prior art.
Used technical solution is the present invention to solve above-mentioned technical problem：
A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment carries device for mark, including open type aerobic box, described
One upper lateral part of open type aerobic box is equipped with water inlet, and the unpowered oxygenation coordinated with water inlet is equipped in the open type aerobic box
Water distributor, the side lower part far from water inlet is equipped with closed anaerobic room, closed anaerobism ceiling in the open type aerobic box
Portion is less than unpowered oxygenation water distributor, and unpowered aeration waterwheel equipment and unpowered oxygenation are equipped with successively at the top of the closed anaerobic room
Ditch plate, unpowered aeration waterwheel equipment are positioned close to the side of water inlet, and the closed anaerobic room, which is equipped with, is connected to unpowered increasing
Anaerobic room water inlet pipe inside oxygen ditch plate and closed anaerobic room, the closed anaerobic room side wall are equipped with water outlet, open wide
It is equipped with aerobic bacteria in formula aerobic box, anaerobic bacteria is equipped in closed anaerobic room.
The described unpowered one end of oxygenation water distributor far from water inlet is arranged right below partition board, and the partition board both sides are mounted on
On open type aerobic box side wall, partition board upper end is higher than closed anaerobic room top, partition board lower end and bottom in open type aerobic box
Between and partition board and closed anaerobic room between be equipped with intake tunnel.
The unpowered oxygenation water distributor includes the support plate being inclined on open type aerobic box side wall, the support
It is uniformly provided with several limbers on plate, side of each limbers far from water inlet is corresponded in support plate and is equipped with barb baffle.
The unpowered aeration waterwheel equipment includes waterwheel holder, and waterwheel holder is equipped with shaft, is uniformly provided in shaft several
Scraper plate is equipped with the baffle coordinated with scraper plate at the top of the closed anaerobic room below the shaft.
The unpowered oxygenation ditch plate includes several channel plates being vertically provided at the top of closed anaerobic room, if dry passage
Plate forms S type intake tunnels, and S type intake tunnel entrances coordinate with unpowered aeration waterwheel equipment, and outlet is connected to anaerobic room water inlet pipe.
The position of corresponding S type intake tunnels is uniformly provided with several reverse V-shaped plates at the top of the closed anaerobic room.
The anaerobic room water inlet pipe end leads to closed anaerobic room bottom.
The more metal micro-electrolysis stuffings of high-activity nano are equipped in the open type aerobic box.
The present invention using the above scheme, for existing rural domestic sewage treatment, in existing three lattice
On the basis of formula septic tank, devises a kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment and carry device for mark, by setting
Open type aerobic box and closed anaerobic room are counted, water inlet is connected with the outlet of existing three compartment septic tank, to existing three format
Septic tank treated sewage carries out motorless aerobic bacteria processing and anaerobic bacteria processing, and then realizes that sanitary sewage disposal reaches
Discharge standard, open type aerobic box may be implemented to sterilize sewage by the ultraviolet light in sunlight, such as Escherichia coli；It is logical
It crosses and designs unpowered oxygenation water distributor, unpowered aeration waterwheel equipment and unpowered oxygenation ditch plate, realize three-level oxygenation, and then realize nothing
It needs power to achieve that and increases sewage and oxygen contact area, to improve sewage treating efficiency and effect；The rural area of the application
The discharge of sanitary sewage power-free multi-stage aerobic treatment carries device for mark in the case where making full use of existing three compartment septic tank, into one
Step proceeds without the water that three compartment septic tanks are discharged the Aerobic Process for Treatment and Anaerobic Treatment of power, has at low cost, sewage disposal
The advantage that effect is good and sewage treating efficiency is high, convenient for being promoted the use of in rural area.
Description of the drawings：
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the side view of the present invention；
Fig. 3 is the vertical view of the present invention；
In figure, 1, open type aerobic box, 2, water inlet, 3, unpowered oxygenation water distributor, 301, support plate, 302, water flowing
Hole, 303, barb baffle, 4, closed anaerobic room, 5, unpowered aeration waterwheel equipment, 501, waterwheel holder, 502, shaft, 503, scrape
Plate, 504, baffle, 6, unpowered oxygenation ditch plate, 601, channel plate, 602, S type intake tunnels, 603, reverse V-shaped plate, 7, anaerobic room
Water inlet pipe, 8, water outlet, 9, partition board, 10, intake tunnel.
Specific implementation mode：
In order to clarify the technical characteristics of the invention, below by specific implementation mode, and its attached drawing is combined, to this hair
It is bright to be described in detail.
As shown in Figs. 1-3, a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge puies forward device for mark, including open type
Aerobic box 1,1 one upper lateral part of open type aerobic box are equipped with water inlet 2, the nothing coordinated with water inlet 2 are equipped in open type aerobic box 1
Power oxygenation water distributor 3, the side lower part far from water inlet 2 in open type aerobic box 1 is equipped with closed anaerobic room 4, closed
4 top of anaerobic room is less than unpowered oxygenation water distributor 3, and 4 top of closed anaerobic room is equipped with unpowered aeration waterwheel equipment 5 and nothing successively
Power oxygenation ditch plate 6, unpowered aeration waterwheel equipment 5 is arranged at 4 top of closed anaerobic room close to the side of water inlet 2, closed
Anaerobic room 4 is equipped with the anaerobic room water inlet pipe 7 being connected to inside unpowered oxygenation ditch plate 6 and closed anaerobic room 4, closed anaerobism
4 side wall of room is equipped with water outlet 8, and aerobic bacteria is equipped in open type aerobic box 1, anaerobic bacteria is equipped in closed anaerobic room 4.Pass through
Open type aerobic box 1 and closed anaerobic room 4 are designed, water inlet 2 is connected with the outlet of existing three compartment septic tank, to existing three
Compartment septic tank treated sewage carries out motorless aerobic bacteria processing and anaerobic bacteria processing, and then realizes sanitary sewage disposal
Reach discharge standard, open type aerobic box 1 may be implemented sewage to be sterilized by the ultraviolet light in sunlight, such as large intestine bar
Bacterium；By the unpowered oxygenation water distributor 3 of design, unpowered aeration waterwheel equipment 5 and unpowered oxygenation ditch plate 6, three-level oxygenation is realized, into
And realize and achieve that increase sewage and oxygen contact area without power, to improve sewage treating efficiency and effect；This Shen
Domestic sewage in rural areas power-free multi-stage aerobic treatment discharge please carries device for mark in the feelings for making full use of existing three compartment septic tank
Under condition, the Aerobic Process for Treatment and Anaerobic Treatment of power further are proceeded without to the water of three compartment septic tanks discharge, have it is at low cost,
Good sewage processing effect and the high advantage of sewage treating efficiency, convenient for being promoted the use of in rural area.
The unpowered one end of oxygenation water distributor 3 far from water inlet 2 is arranged right below partition board 9, and 9 both sides of partition board, which are mounted on, to be opened wide
On 1 side wall of formula aerobic box, 9 upper end of partition board is higher than 4 top of closed anaerobic room, 9 lower end of partition board and bottom in open type aerobic box 1
Between and partition board 9 and closed anaerobic room 4 between be equipped with intake tunnel 10.It can realize 1 bottom sewage of open type aerobic box
Mobility, prevent sewage disposal from having dead angle, further increase wastewater treatment efficiency.
Unpowered oxygenation water distributor 3 includes the support plate 301 being inclined on 1 side wall of open type aerobic box, support plate
It is uniformly provided with several limbers 302 on 301, side of each limbers 302 far from water inlet 2 is corresponded in support plate 301 and is equipped with
Barb baffle 303.The sewage facilitated access for is flowed out from limbers 302, and then is realized to sewage separation, and sewage and air are increased
Contact area.
Unpowered aeration waterwheel equipment 5 includes waterwheel holder 501, and waterwheel holder 501 is equipped with shaft 502, in shaft 502 uniformly
Equipped with several scraper plates 503,4 top of closed anaerobic room immediately below shaft 502 is equipped with the baffle 504 coordinated with scraper plate 503, real
Existing sewage pushes scraper plate 503 to rotate, and scraper plate 503 sweeps sewage, while increasing sewage with air contact area, pushes sewage
Into S types intake tunnel 602.
Unpowered oxygenation ditch plate 6 includes several channel plates 601, Ruo Gantong for being vertically provided at 4 top of closed anaerobic room
Guidance tape 601 forms S types intake tunnel 602, and 602 entrance of S types intake tunnel coordinates with unpowered aeration waterwheel equipment 5, outlet and anaerobism
Room water inlet pipe 7 is connected to, and by designing S type intake tunnels, is increased sewage and air contact area, is accelerated Aerobic Process for Treatment.
The position that 4 top of closed anaerobic room corresponds to S types intake tunnel 602 is uniformly provided with several reverse V-shaped plates 603, reverse V-shaped
Plate 603 coordinates with S types intake tunnel 602, makes to stir evenly into 602 sewage of S types intake tunnel, and undulate advances, into one
Step increases sewage and oxygen contact area, improves wastewater treatment efficiency.
4 bottom of closed anaerobic room is led in 7 end of anaerobic room water inlet pipe, so that sewage is carried out sufficient anaerobism sterilization and eliminates,
Especially to containing the substance decompositions such as ammonia, nitrogen, the decoloration to sewage is realized.
The more metal micro-electrolysis stuffings of high-activity nano, the more metal light electrolysis of high-activity nano are equipped in open type aerobic box 1
Filler further increases processing of the aerobic stage to sewage with aerobic bacteria cooperation.
The course of work of the present invention：
First, the water inlet of the application 2 and the outlet of existing three compartment septic tank are connected, is discharged by three compartment septic tanks
Sewage entered in open type aerobic box 1 by water inlet 2, sewage flows to unpowered oxygenation water distributor 3 through water inlet 2 first,
Sewage is efficiently flowed out from limbers 302 under the action of barb baffle 303, falls on open type aerobic box 1 under the effect of gravity
Bottom, under the action of unpowered oxygenation water distributor 3, sewage is divided into several weeps, and then realizes and increase sewage and oxygen
Contact area (contact increase) with aerobic bacteria, as sewage constantly enters, 1 bottom sewage of open type aerobic box due to every
Enter intake tunnel 10 under the action of plate 9, when the water level in intake tunnel 10 is more than closed anaerobic room 4, water jet propulsion is scraped
Plate 503 rotates, and increases the contact area of sewage and oxygen under the action of scraper plate 503, further increases wastewater treatment efficiency, passes through
The sewage for crossing unpowered aeration waterwheel equipment 5 enters S types intake tunnel 602, in the effect of S types intake tunnel 602 and reverse V-shaped plate 603
Under, sewage is S-type and waveform is advanced, so that sewage stirs evenly and increase sewage and oxygen contact area, finally from S
Type intake tunnel 602 exits into anaerobic room water inlet pipe 7, by 7 sewage of anaerobic room water inlet pipe enter closed anaerobic room 4 in into
Row Anaerobic Treatment flows out after Anaerobic Treatment from water outlet 8, and the water of outflow has reached discharge standard, can have been recycled,
Such as irrigated farmland etc..The domestic sewage in rural areas power-free multi-stage aerobic treatment discharge of the application carries device for mark, has without dynamic
The advantages that power, at low cost, good sewage processing effect, convenient for being promoted the use of in rural area.
Above-mentioned specific implementation mode cannot function as limiting the scope of the invention, for the technology people of the art
For member, any alternate modification or transformation made to embodiment of the present invention are all fallen in protection scope of the present invention.
Place is not described in detail by the present invention, is the known technology of those skilled in the art of the present technique.
Claims (8)
1. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge carries device for mark, it is characterised in that：It is good including open type
Oxygen case, one upper lateral part of open type aerobic box are equipped with water inlet, are equipped in the open type aerobic box and to coordinate with water inlet
Unpowered oxygenation water distributor, the side lower part far from water inlet is equipped with closed anaerobic room, closing in the open type aerobic box
Be less than unpowered oxygenation water distributor at the top of formula anaerobic room, be equipped with successively at the top of the closed anaerobic room unpowered aeration waterwheel equipment and
Unpowered oxygenation ditch plate, unpowered aeration waterwheel equipment are positioned close to the side of water inlet, and the closed anaerobic room, which is equipped with, to be connected
Lead to the anaerobic room water inlet pipe inside unpowered oxygenation ditch plate and closed anaerobic room, the closed anaerobic room side wall is equipped with out
The mouth of a river, open type aerobic box is interior to be equipped with aerobic bacteria, and anaerobic bacteria is equipped in closed anaerobic room.
2. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The described unpowered one end of oxygenation water distributor far from water inlet is arranged right below partition board, and the partition board both sides are mounted on
On open type aerobic box side wall, partition board upper end is higher than closed anaerobic room top, partition board lower end and bottom in open type aerobic box
Between and partition board and closed anaerobic room between be equipped with intake tunnel.
3. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The unpowered oxygenation water distributor includes the support plate being inclined on open type aerobic box side wall, the support
It is uniformly provided with several limbers on plate, side of each limbers far from water inlet is corresponded in support plate and is equipped with barb baffle.
4. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The unpowered aeration waterwheel equipment includes waterwheel holder, and waterwheel holder is equipped with shaft, several scrape is uniformly provided in shaft
Plate is equipped with the baffle coordinated with scraper plate at the top of the closed anaerobic room below the shaft.
5. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The unpowered oxygenation ditch plate includes several channel plates being vertically provided at the top of closed anaerobic room, if dry passage
Plate forms S type intake tunnels, and S type intake tunnel entrances coordinate with unpowered aeration waterwheel equipment, and outlet is connected to anaerobic room water inlet pipe.
6. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 5 carries device for mark, special
Sign is：The position of corresponding S type intake tunnels is uniformly provided with several reverse V-shaped plates at the top of the closed anaerobic room.
7. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The anaerobic room water inlet pipe end leads to closed anaerobic room bottom.
8. a kind of domestic sewage in rural areas power-free multi-stage aerobic treatment discharge according to claim 1 carries device for mark, special
Sign is：The more metal micro-electrolysis stuffings of high-activity nano are equipped in the open type aerobic box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247867.5A CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247867.5A CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
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| Publication Number | Publication Date |
|---|---|
| CN108658231A true CN108658231A (en) | 2018-10-16 |
| CN108658231B CN108658231B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810247867.5A Active CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
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| CN105399203A (en) * | 2015-11-02 | 2016-03-16 | 重庆大学 | Lateral subsurface flow wetland treatment device and treatment method capable of realizing ANAMMOX denitrification |
| CN205635263U (en) * | 2016-04-29 | 2016-10-12 | 合肥市科柏盛环保科技有限公司 | Rural domestic sewage is unpowered to oxygenate purification composite media wetland system |
| CN105859051A (en) * | 2016-06-06 | 2016-08-17 | 王佳莺 | Biogas slurry optical treatment breeding system and working method thereof |
| CN208345855U (en) * | 2018-03-23 | 2019-01-08 | 山东航凯船舶科技有限公司 | A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment mentions device for mark |
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