CN106045018A - Disc distribution adjustable biological rotating disc - Google Patents
Disc distribution adjustable biological rotating disc Download PDFInfo
- Publication number
- CN106045018A CN106045018A CN201610566977.9A CN201610566977A CN106045018A CN 106045018 A CN106045018 A CN 106045018A CN 201610566977 A CN201610566977 A CN 201610566977A CN 106045018 A CN106045018 A CN 106045018A
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- China
- Prior art keywords
- disc
- interior
- outer shaft
- shaft
- connection
- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/08—Aerobic processes using moving contact bodies
- C02F3/082—Rotating biological contactors
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (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
The invention discloses a disc distribution adjustable biological rotating disc. The disc distribution adjustable biological rotating disc comprises a rotating shaft, wherein the rotating shaft consists of an outer shaft and an inner shaft which is arranged in the outer shaft; discontinuous sections for exposing the inner shaft are formed on the outer shaft at intervals; connecting ridges which are connected with discs are formed on the outer shaft and the parts of the inner shaft which are exposed from the discontinuous sections; the connecting ridges on the outer shaft and the inner shaft are arranged at intervals; one end of the outer shaft is connected with a motor; the inner shaft is driven to rotate in the same direction as the outer shaft through the outer shaft; each outer disc is connected with the corresponding outer connecting ridge on the outer shaft through a connecting piece; each inner disc is connected with the corresponding inner connecting ridge on the inner shaft through a connecting piece; after the discs are connected, the inner discs and the outer discs are arranged at intervals; the relative positions of the outer discs and the inner discs can be moved by changing the rotating direction of the motor and driving the outer shaft to rotate. Good mechanical transmission of a biological rotating disc can be better ensured by changing the distribution mode of the discs; good environment can be provided for the mechanical transmission and the attachment of microbes; good hydraulic characteristics and oxygen transfer capacity of a biological membrane can be kept, so that the biological membrane can be maintained in a good automatic updating state chronically and stably.
Description
Technical field
The present invention relates to the equipment for biological rotating disk PROCESS FOR TREATMENT sanitary sewage He other waste water, particularly relate to one
Disc is distributed adjustable biological rotating disk.
Background technology
Population sharply increases, and resource consumption constantly expands, and the industry of a large amount of discharges and domestic pollutant make the existence of the mankind
Environment goes from bad to worse.Protecting ecology water environment, seeks efficient, stable, the sewage disposal technology ever more important of low cost.Biological turn
Dish is the common technology that biomembrance process processes sewage, has reduced investment, treatment effeciency height, stable performance, strong adaptability and operation
The advantages such as management is easy, have development potentiality very much.
Though biological rotating disk is the one of biomembrance process, but it is that biological rotating disk is more with the difference of other biomembrance process and depends on
Mechanism.Using disc as biofilm carrier, provide rotary power by machine driving, provide suitably for biomembrane simultaneously
Growth conditions, to carry out optimum biochemical action, i.e. keeps biomembranous self renewal state.This self renewal state needs to protect
Hold in a dynamic range of balance, the undue growth of microorganism and the thin degraded being all unfavorable for pollutant of biofilm.Disc
In rotation process, water produces shear action to biomembrane, and shearing force size directly affects biofilm thickness, and rotating speed is different, generation
Shearing force is different.General biological rotating disk, controls biofilm thickness by regulation rotating speed only.But when inflow and water quality send relatively
During great fluctuation process, exist owing to water quantity and quality fluctuation causes effluent quality to deteriorate so that the energy of rotating biological contactor anti impulsion load
Power is low.
Summary of the invention
Based on the problem existing for above-mentioned prior art, the present invention provides a kind of disc to be distributed adjustable biological rotating disk, energy
Adjust disc distribution mode, improve rotating biological contactor anti impulsion load ability.
For solving above-mentioned technical problem, the present invention provides a kind of disc to be distributed adjustable biological rotating disk, including:
Rotating shaft, some interior discs and some outer discs；Wherein,
Described rotating shaft is made up of outer shaft and the interior axle being movably arranged in described outer shaft, described outer shaft is interval with and exposes
The interruption of described interior axle is interval, and described outer shaft is provided with the outer connection ridge connecting disc, and it is described interior that described interruption interval is exposed
Axle is provided with the interior connection ridge connecting disc, and the outer connection ridge that described outer shaft connects disc is connected disc on described interior axle
Interior connection ridge is spaced；
Described outer shaft one end is connected with motor, can be by described motor-driven rotation；
Described interior axle can be by the drive of described outer shaft with the equidirectional rotation of described outer shaft；
Described each outer disc is connected on each outer connection ridge of described outer shaft, and described each interior disc is connected to institute
Stating on each interior connection ridge of interior axle, after connection, the interior disc on described interior axle is spaced with the outer disc on described outer shaft, institute
State the outer disc connected on outer shaft to be moved with the relative position of the interior disc of connection on described interior axle when rotating.
The invention have the benefit that by using the rotating shaft that the inside and outside axle moved relative to position can be occurred to constitute so that
Inside and outside axle rotational band Moving plate sheet occurs to move relative to position, thus changes the change of biological rotating disk entirety disc distribution mode, energy
It is prevented effectively from the phenomenon that biomembrane is blocked up, moreover it is possible to the generation of the pernicious operating modes such as reply filamentous bacteria amount reproduction, for machine driving
There is provided good environmental condition with microorganism attachment, keep hydraulic characteristic and oxygen transmission capacity that biomembrane is good, it is ensured that raw
The disposal ability that thing film is good to sewage.Additionally, the biological rotating disk that the present invention provides can effectively reduce energy consumption, improve the profit of the energy
By efficiency, on the one hand, interior outer shaft occurs moving relative to position, relies primarily on the characteristic of this body structure of rotating shaft, it is not necessary to additionally
There is provided the energy or other ancillary methods, on the other hand, it is possible to effectively control biofilm thickness by adjusting motor steering, it is to avoid raw
The increase of the blocked up rotating disk heavy burden load caused of thing film, thus reduce the operation energy consumption that rotating biological contactor is overall.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
The biological rotating disk pivot structure front view that Fig. 1 embodiment of the present invention provides；
The inside and outside disc equalization four-piece type biological rotating disk front view that Fig. 2 embodiment of the present invention provides；
The inside and outside disc equalization four-piece type biological rotating disk side view that Fig. 3 embodiment of the present invention provides；
The inside and outside disc that Fig. 4 embodiment of the present invention provides is the full circle disc scattergram of fourth class circular arc composition；
The inside and outside disc that Fig. 5 embodiment of the present invention provides is full circle disc scattergram；
In figure: 1-motor；2-outer shaft；21-the first beam；22-the second beam；Ridge is connected outside 23-；Axle in 3-；31-first gear
Plate；32-second baffle；Ridge is connected in 33-；4-connects sheet；The outer disc of 5-；Disc in 6-.
Detailed description of the invention
Below the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment
It is only a part of embodiment of the present invention rather than whole embodiments.Based on embodiments of the invention, ordinary skill
The every other embodiment that personnel are obtained under not making creative work premise, broadly falls into protection scope of the present invention.
As shown in Figures 1 to 4, the embodiment of the present invention provides a kind of disc to be distributed adjustable biological rotating disk, including:
Rotating shaft, some interior discs and some outer discs；Wherein,
Described rotating shaft is made up of outer shaft and the interior axle being movably arranged in described outer shaft, described outer shaft is interval with and exposes
The interruption of described interior axle is interval, and described outer shaft is provided with the outer connection ridge connecting disc, and it is described interior that described interruption interval is exposed
Axle is provided with the interior connection ridge connecting disc, and the outer connection ridge that described outer shaft connects disc is connected disc on described interior axle
Interior connection ridge is spaced；
Described outer shaft one end is connected with motor, can be by described motor-driven rotation；
Described interior axle can be by the drive of described outer shaft with the equidirectional rotation of described outer shaft；
Described each outer disc is connected on each outer connection ridge of described outer shaft, and described each interior disc is connected to institute
Stating on each interior connection ridge of interior axle, after connection, the interior disc on described interior axle is spaced with the outer disc on described outer shaft, institute
State the outer disc connected on outer shaft to be moved with the relative position of the interior disc of connection on described interior axle when rotating.
In above-mentioned biological rotating disk, outer shaft is made up of at least two beam and some outer connection ridges；Wherein, in said two beam
First beam is connected with the second beam in said two beam through some described outer connection ridges, and beam and some outer connection ridges on outer shaft exist
Axial section structure ringwise, adjacent described first beam between outer connection ridge and between the second beam region be connect in interior axle ridge and
The activity interval of baffle plate；
Described outer connection ridge is provided with the disc junction point connecting outer disc.
In above-mentioned biological rotating disk, it is in and being interrupted on interval described interior axle of described outer shaft is equipped with first and second baffle plate, the
One, connect through interior connection ridge between two baffle plates, first and second baffle plate and interior connection ridge height be all connected with described outer shaft outer ridge,
First beam and the second depth of beam match, can when described outer shaft rotates by described first beam or the second beam to the first baffle plate or
The interception function of second baffle drives interior axle with the equidirectional rotation of outer shaft；
Described interior connection ridge is provided with the disc junction point of disc in connecting.
In above-mentioned biological rotating disk, interior disc uses arc disc, and described outer disc uses disc or the arc disc of full circle.
Above-mentioned biological rotating disk also includes: motor, is connected with outer shaft one end of described rotating shaft, and described outer shaft can be driven to rotate.
In above-mentioned biological rotating disk, each outer disc is connected on each outer connection ridge of described outer shaft by connection sheet respectively；Institute
State each interior disc to be connected on each interior connection ridge of described interior axle by connection sheet respectively.
Concrete, structure and the internal layout of the adjustable biological rotating disk of disc distribution mode that the present invention provides are as follows
(seeing Fig. 1 to 4), is mainly made up of rotating shaft system and Disc System, wherein:
(1) rotating shaft system:
Rotating shaft is the main part of this biological rotating disk, is made up of interior axle and outer shaft, and on outer shaft, level is in axial first
Beam, the second beam and be perpendicular to axial some outer connection ridges outer shaft be divided into multiple be interrupted interval, each be interrupted interval dew
Going out the part of interior axle, the interruption that this part also serves as interior axle is interval, and the outer connection ridge on outer shaft all can connect outer disk through connecting sheet
Sheet, connect the number of outer disc and position can according to the actual requirements depending on.Two gears it are respectively arranged with in each interruption interval on interior axle
Plate (i.e. first and second baffle plate), first and second height of baffle plate matches (the most same or like) with outer connection ridge and depth of beam, and two
Between individual baffle plate height and outer connection ridge match (the most same or like) interior connection ridge can by connect sheet connect in disc.
The baffle plate on interior connection ridge both sides in the axial direction, is fettered by the outer connection ridge of the outer shaft of both sides, when outer shaft occurs clockwise with motor
During rotation, the second baffle of interior connection ridge top is intercepted by the second beam of outer shaft, it is achieved inside and outside axle is equidirectional to be rotated clockwise.
Between when the system is operated longer, when biomembrane is blocked up, change motor direction of rotation, now outer shaft rotates counterclockwise, interior connection ridge
The first following baffle plate is intercepted by the first beam of outer shaft, and inside and outside axle is equidirectional to be rotated counterclockwise, interior outer shaft relative to change in location,
Thus change rotating biological contactor disc distribution mode.
(2) Disc System:
Selecting the disc that adapts with pivot structure, be connected with interior axle becomes interior disc, be connected with outer shaft for outer disk
Sheet, inside and outside disc is connected with the inside and outside ridge that is connected on inside and outside axle by connection sheet respectively, and inside and outside disc is staggered, and two
Plant disc diameter same or like, additionally, disc material, lines, coating and processing mode etc. all can be same or like.According to turning
The construction features of axle, outer disc can be the disc of completely circular structure, it is possible to for impartial 2,3,4,5,6 ... the splicing of individual circular arc disc and
The full circle become or non-completely circular structure.When outer disc is non-completely circular structure, it is staggered with the interior disc quartering on shaft section
Time, rotational axis direction changes, and the change of disc distribution mode becomes apparent from；It is whole that outer disc monolithic full circle or multi-disc arc disc form
During circular disc, outer disc and interior disc always have the part of overlap on rotating shaft cross section, the main change of rotational axis direction change
It it is the position of two disc laps.
When interior axle is divided into impartial 2,3,4,5,6 by the beam on outer shaft and ridge ... during part, the inner disc being connected with interior axle
Sheet is at least also adopted by 2,3,4,5, the 6 of equalization ... the non-completely circular structure that individual circular arc disc is spliced.Generally, internal and external disk
Depending on the number that sheet is divided equally can be according to the size of disk plate for biological rotating disk diameter, diameter is the biggest, the number that axle and disc are divided equally
The most.When diameter is more than 3m, axle and disc be preferably divided into more than 4 parts, guarantee equipment total and operational effect
Stability (inside and outside disc structure is as shown in Figure 4,5).
Below in conjunction with specific embodiment, biological rotating disk of the present invention is described further.
As shown in Figures 1 to 4, the present embodiment provides and rotating shaft system and the most matched Disc System is combined into
The adjustable biological rotating disk of disc distribution mode, rotating shaft is made up of interior axle 3 and outer shaft 2, with the company of disc on interior axle 3 and outer shaft 2
Contact separation arranges.Rotating shaft system includes motor 1, outer shaft 2, interior axle 3, and outer shaft is by interior first beam 21, outer second beam 22 and outer company
Connecing ridge 23 to form, each outer shaft at least two beams, beam is the trunk structure running through whole axle in the axial direction.Interior axle is by first gear
Plate 31, second baffle 32 and interior connection ridge 33 form, and each interior connection ridge 33 both sides arrange two baffle plates (as it is shown in figure 1, be
First baffle plate 31 and second baffle 32).Disc System by connecting sheet 4, outer disc 5, interior disc 6 form, outer disc 5 and interior disc
6 by connecting sheet 4 and be connected ridge 23 with outer on outer shaft 2 and interior connection ridge 33 being connected.
When rotating shaft system rests on position shown in Fig. 1, when motor 1 drives outer shaft 2 to rotate clockwise, on outer shaft 2
Second baffle 32 above second beam 22 and interior connection ridge 33 is in close contact, and interior axle 3 passes through the second baffle 32 power by outer shaft 2
Effect, follow outer shaft 2 and rotate clockwise；Otherwise, when motor 1 rotates counterclockwise, drive the first beam 21 He on outer shaft 2
The first baffle plate 31 on interior axle 3 contacts, and interior axle 3 does rotation counterclockwise with outer shaft 2；When axis of rotation direction changes, outer shaft 2 and interior
Relative position on axle 3 changes, and owing to outer disc 5 connects outer shaft 2, interior disc 6 connects interior axle 3, therefore, axis of rotation side
To change, two kinds of discs cause disc distribution mode to adjust (disc variation pattern is as shown in Figure 2,3) relative to change in location.
By changing of disc distribution mode, the biological rotating disk of the present invention, preferably ensures that the machinery that biological rotating disk is good passes
Dynamic, adhere to, for machine driving and microorganism, the environmental condition providing good in biological rotating disk configuration aspects, keep biomembrane good
Hydraulic characteristic and oxygen transmission capacity, make biomembrane be in steadily in the long term and preferably automatically update state.When inflow and water
When matter sends larger fluctuation, change disk plate for biological rotating disk distribution mode, the water outlet water caused due to water quantity and quality fluctuation can be avoided
Matter deteriorates, and improves the ability of rotating biological contactor anti impulsion load.Distribution mode changes, and makes biomembrane be in anaerobic-aerobic alternately
Environment, it is achieved good Nitrogen/Phosphorus Removal.All in all, the adjustable biology of disc distribution mode that the present invention provides turns
Dish, is conducive to promoting biological rotating disk disposal ability, it is ensured that the operation steady in a long-term of system.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be as the criterion.
Claims (6)
1. a disc is distributed adjustable biological rotating disk, it is characterised in that including:
Rotating shaft, some interior discs and some outer discs；Wherein,
Described rotating shaft is made up of outer shaft and the interior axle being movably arranged in described outer shaft, described outer shaft is interval with described in exposing
The interruption of interior axle is interval, and described outer shaft is provided with the outer connection ridge connecting disc, on the described interior axle that described interruption interval is exposed
Being provided with the interior connection ridge connecting disc, the outer connection ridge that described outer shaft connects disc connects within being connected disc on described interior axle
Connect ridge to be spaced；
Described outer shaft one end is connected with motor, can be by described motor-driven rotation；
Described interior axle can be by the drive of described outer shaft with the equidirectional rotation of described outer shaft；
Described each outer disc is connected on each outer connection ridge of described outer shaft, and described each interior disc is connected to described interior
On each interior connection ridge of axle, after connection, the interior disc on described interior axle is spaced with the outer disc on described outer shaft, described outside
The outer disc connected on axle can be moved with the relative position of the interior disc of connection on described interior axle when rotating.
A kind of disc the most according to claim 1 is distributed adjustable biological rotating disk, it is characterised in that described outer shaft is by least
Two beams and some outer connection ridges are constituted；Wherein, the first beam in said two beam is through some described outer connection ridges and described two
The second beam in individual beam connects, and beam on outer shaft and some outer connection ridges are at axial section structure ringwise, adjacent outer connection ridge
Between described first beam and the second beam between region for be interrupted interval, as interior connection ridge and the gear of described interior axle between this unconnected area
The activity interval of plate；
Described outer connection ridge is provided with the disc junction point connecting outer disc.
A kind of disc the most according to claim 1 and 2 is distributed adjustable biological rotating disk, it is characterised in that be in described outside
Being interrupted on interval described interior axle of axle is equipped with first and second baffle plate, connects through interior connection ridge between first and second baffle plate, first,
Two baffle plates and interior connection ridge height all match with outer ridge, the first beam and second depth of beam of being connected of described outer shaft, can be in institute
Stating is driven interior axle with outer shaft the interception function of the first baffle plate or second baffle by described first beam or the second beam when outer shaft rotates
Equidirectional rotation；
Described interior connection ridge is provided with the disc junction point of disc in connecting.
A kind of disc the most according to claim 1 and 2 is distributed adjustable biological rotating disk, it is characterised in that described interior disc
Using arc disc, described outer disc uses disc or the arc disc of full circle.
A kind of disc the most according to claim 1 and 2 is distributed adjustable biological rotating disk, it is characterised in that also include: electricity
Machine, is connected with outer shaft one end of described rotating shaft, and described outer shaft can be driven to rotate.
A kind of disc the most according to claim 1 and 2 is distributed adjustable biological rotating disk, it is characterised in that described each outer disk
Sheet is connected on each outer connection ridge of described outer shaft by connection sheet respectively；Described each interior disc is connected to by connection sheet respectively
On each interior connection ridge of described interior axle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610566977.9A CN106045018B (en) | 2016-07-18 | 2016-07-18 | A kind of adjustable biological rotating disk of disc distribution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610566977.9A CN106045018B (en) | 2016-07-18 | 2016-07-18 | A kind of adjustable biological rotating disk of disc distribution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106045018A true CN106045018A (en) | 2016-10-26 |
| CN106045018B CN106045018B (en) | 2019-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610566977.9A Active CN106045018B (en) | 2016-07-18 | 2016-07-18 | A kind of adjustable biological rotating disk of disc distribution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113104958A (en) * | 2021-04-19 | 2021-07-13 | 深圳市冠升华实业发展有限公司 | Degradation treatment equipment for high-concentration wastewater reuse and treatment method thereof |
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|---|---|---|---|---|
| DE19818274A1 (en) * | 1998-03-30 | 1999-10-07 | Ihu Ges Fuer Ingenieur Hydro U | Biological aerobic waste water treatment assembly |
| CN1502571A (en) * | 2002-11-26 | 2004-06-09 | 上海西科水科学环保技术有限公司 | Rotary disk type sewage treatment aerating apparatus |
| CN101224920A (en) * | 2008-02-15 | 2008-07-23 | 北京金州环保发展有限公司 | Planetary rotating brush |
| CN202508931U (en) * | 2012-03-29 | 2012-10-31 | 北京海斯顿水处理设备有限公司 | Novel structure biological disc sheet easy for microbe biofilm formation |
| CN204661413U (en) * | 2015-05-13 | 2015-09-23 | 南京元凯生物能源环保工程有限公司 | The bio-disc reactor of bio-disc and composition thereof |
-
2016
- 2016-07-18 CN CN201610566977.9A patent/CN106045018B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19818274A1 (en) * | 1998-03-30 | 1999-10-07 | Ihu Ges Fuer Ingenieur Hydro U | Biological aerobic waste water treatment assembly |
| CN1502571A (en) * | 2002-11-26 | 2004-06-09 | 上海西科水科学环保技术有限公司 | Rotary disk type sewage treatment aerating apparatus |
| CN101224920A (en) * | 2008-02-15 | 2008-07-23 | 北京金州环保发展有限公司 | Planetary rotating brush |
| CN202508931U (en) * | 2012-03-29 | 2012-10-31 | 北京海斯顿水处理设备有限公司 | Novel structure biological disc sheet easy for microbe biofilm formation |
| CN204661413U (en) * | 2015-05-13 | 2015-09-23 | 南京元凯生物能源环保工程有限公司 | The bio-disc reactor of bio-disc and composition thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113104958A (en) * | 2021-04-19 | 2021-07-13 | 深圳市冠升华实业发展有限公司 | Degradation treatment equipment for high-concentration wastewater reuse and treatment method thereof |
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| Publication number | Publication date |
|---|---|
| CN106045018B (en) | 2019-04-30 |
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