CN105036296B - A Submerged Flat Plate Membrane Bioreactor with Additional Microchannel Turbulence Promoters - Google Patents
A Submerged Flat Plate Membrane Bioreactor with Additional Microchannel Turbulence Promoters Download PDFInfo
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- CN105036296B CN105036296B CN201510220947.8A CN201510220947A CN105036296B CN 105036296 B CN105036296 B CN 105036296B CN 201510220947 A CN201510220947 A CN 201510220947A CN 105036296 B CN105036296 B CN 105036296B
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- 239000010865 sewage Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000005276 aerator Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 5
- 238000000108 ultra-filtration Methods 0.000 claims description 5
- 230000002572 peristaltic effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
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Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a kind of immersed flat plate membrane bioreactors of Additional microchannels turbulence promoter.Microchannel turbulence promoter is placed in immersed flat plate membrane bioreactor with certain spacing and arrangement mode, the gas generated by aerator and its liquid carried form fluid-mixing, rise in channel between film and microchannel turbulence promoter, to generate slug flow；Microchannel turbulence promoter increases the turbulent extent of film surface, further generates shearing force in film surface, reduces boundary layer thickness, extenuate concentration polarization.When sewage passes through microchannel turbulence promoter, the effects of mud granule is by adsorbing, building bridge, is trapped in microchannel, does not easily cause Pore Blocking；Institute's a large amount of micropore of cloth can make suspension particle after film surface deposition on the turbulence promoter of microchannel, form that resistance to compression is more preferable, the higher cake layer of porosity, promotion is deposited on falling off for film surface cake layer, reduces the accumulating rate of cake layer, improves membrane flux and correspondingly extenuates fouling membrane.
Description
Technical field
The present invention relates to a kind of immersed flat plate membrane bioreactors of Additional microchannels turbulence promoter.
Background technique
Membrane bioreactor is a kind of novel, efficient sewage disposal technology, in view of it with conventional processes institute nothing
Method analogy plurality of advantages (such as: effluent quality is good, sludge concentration is high, the organic loading that can bear is high, land occupation less, sludge yield
It is low, be easily achieved automatic control, convenient operation and management etc.), in recent years by the high praise energetically of scholar and water process practitioner
And concern.Especially Nets impregnated, it is present that its structure is more compact, operating pressure is smaller, energy consumption is lower
The focus of membrane bioreactor research and application.Compared with tubular membrane, rolled film, curtain type membrane and beam formula film, plate membrane is due to it
The advantage that flux is high, contamination resistance is strong and HYDRODYNAMIC CONDITION RELATING TO is easily controllable obtains in external field of membrane bioreactor
Preferable research and application, and the research of the plate membrane bioreactor in China is still in infancy.
In addition, fouling membrane and concentration polarization are still and restrict membrane bioreactor application range as other membrane process
With the principal element of degree.Especially Nets impregnated is improved on the basis of inner ring airlift bioreactor
A kind of reactor that efficient biological treatment is combined with film process, but it has apparent defect, as fouling membrane is serious, water flux
Decline is fast, needs periodic cleaning etc., has seriously affected promotion and popularization of the Nets impregnated in engineering, has also constrained
Its processing capacity further increases.So it is very heavy for developing a kind of technology for slowing down Nets impregnated fouling membrane
It wants.
Zhao Zongai et al. carries out yeast juice using the unstable fluidised form mode of additional turbulence promoters in tubular ceramic membrane
Micro-filtration, to explore the affecting laws of flow instabilities, in the hope of improving the pollution problem of ceramic membrane.The turbulence promoter of experiment has
3 kinds: spiral, wound form, variable cross section-type.Additional turbulence promoters strengthen microfiltration of ceramic membrane process experiment in, test and
The membrane filtration rate and energy consumption under the process conditions such as different subjects flow velocity and membrane filtration pressure difference are compared, studies have shown that fluid is unstable
Flowing can promote the convective mass transfer of film surface and main fluid and reduce the deposition pollution of film surface, especially in low mainbody flow speed and high filter
Under pressure difference, it is possible to reduce energy consumption simultaneously improves the rate of filtration.Yeh et al. is improved by winding screw line component and stainless steel plug-in unit
The performance of tubular ultra-filtration membrane, the results showed that fluid velocity can be improved in it, reduces concentration polarization resistance, improves the flux of ultrafiltration membrane.
Xu et al. proposes to use in the application study of recycling municipal sewage earliest in the ceramic membrane bioreactor of additional turbulence promoters
Different shape (column type, spiral and wound form), the turbulence promoter that material is stainless steel improve membrane bioreactor
Membrane flux runs 30 days data by the ceramic membrane bioreactor of assay laboratory's scale, shows that turbulence promoter is added
Permeation flux, pitch 10mm can be improved, diameter is that the wound form turbulence promoter effect of 1.6mm is best；Same
Service condition under, relative to turbulence promoter is not added, turbulence promoter flux, which is added, from 70 increases to 175L/hm2, experiment
The result shows that wound form turbulence promoter, which is added, can increase permeation flux, effluent characteristics do not decline.Ahmad et al. inquires into spiral shell
Rotation baffle plate is studied to the influence of permeation flux in microfiltration process and to the variation of helical baffles geometry.
It was found that helical baffles will increase fluid velocity and boundary shear stress, the flow instabilities state of secondary flow or fluid is generated,
Slow down and inhibit fouling membrane, to increase permeation flux.Et al. to static turbulence promoter de- ester milk cross-flow
Application study discovery static mixer in filtering can cause radial mixing and Secondary Flow, in addition to this, the alternate spiral shell in left and right
Rotation structure can generate vortex, increase the shear rate of film surface, reduction concentration polarization and cake layer thickness, decelerating membrane pollution, from
And significantly improve permeation flux.Chen Zhi et al., which consolidates membrane filtration characteristic in submerged membrane reactor to liquid in turbulence promoter, to be influenced
Research experiment in devise 3 kinds of externals (pusher, spiral and column type) turbulence promoter and carry out film filtration enhancement
Experiment, has investigated influence of the factors such as configuration, the rotation speed of turbulence promoter to membrane flux.The result shows that pusher turbulent flow promotees
It is most obvious into device effect, and with the increase of turbulence promoter rotation speed, membrane flux is also increase accordingly, even if higher outstanding
Under supernatant liquid mass concentration, designed external turbulence promoter will not make certain positions of membrane tube form flow dead zone and stagnant
Area is stayed, membrane flux can be equally improved.Auspicious China in town et al. additional turbulence device strengthen oil field extracted water ultra-filtration process research and
The flux in ultra filtration is improved using turbulence promoter, devise 4 kinds of different structure forms (column type, variable cross-section column type,
Wound form and spiral) turbulator and carry out film filtration enhancement test, investigated configuration, screw pitch of turbulator etc. to membrane flux
And unit produces the influence of water consumption.Wu et al. is in the research that turbulence promoter strengthens micro- mixed efficiency of ceramic membrane bioreactor
It show that micro- mixed efficiency increases, the especially addition of turbulence promoter with the increase of Reynolds number and infiltration rate, can play and disturb
Stream effect, hence it is evident that improve micro- mixed efficiency.Different turbulence promoters is followed successively by static mixing to the sequence of the raising of micro- mixed efficiency
Device, screw type turbulence promoter, column type turbulence promoter.
In conclusion there are many turbulence promoter structure type, as static mixer, plate washer and column type, variable cross section-type,
Spirally, wound form etc. can promote film surface and be trapped substance to bulk solution flowing, mitigates concentration polarization, intensive filtration
Journey.Its structure is simple, method is easy and the rapid effect of good rush, thus is increasingly valued by people.But since turbulent flow promotees
Into the presence of device, effective membrane area can be reduced, and will cause axial pressure drop and increased dramatically, to increase additional energy
Consumption, in order to overcome this disadvantage, is incorporated herein " microchannel " turbulence promoter.Sewage is by microchannel, and mud granule is by absorption, frame
The effects of bridge, is trapped in microchannel, this is highly beneficial to the processing of sewage, and combines again with turbulence promoter, plays
The effect for strengthening turbulence state, so that decelerating membrane pollution and concentration polarization, can also be effectively saved energy consumption.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides it is a kind of can be with decelerating membrane pollution, concentration polarization
Immersed flat panel membrane membrane bioreactor.
In order to reach the goals above, the technical solution adopted by the present invention is that: a kind of leaching of Additional microchannels turbulence promoter
Do not have formula plate membrane bioreactor, including biological reaction tank, plate film assembly, microchannel turbulence promoter, aerator, gas stream
Meter, peristaltic pump, Rinsing Area, PLC control system.Wherein turbulence promoter cross-over configuration in microchannel is in plate film surface, i.e.,
It can play the role of flow-disturbing, mitigate concentration polarization, and because the corrugation lobes on its surface can reduce Pore Blocking, therefore it is dirty to reduce film
Dye.
The plate film assembly is connected with the suction pipeline, the peristaltic pump by being controlled by PLC controller and electricity
Magnet valve alternately to control water outlet and stop finding time, and Lai Shixian Nets impregnated automates continuous operation.
It, can be with the advantage is that: the presence of microchannel turbulence promoter due to present invention employs above technical solution
Play the role of flow-disturbing, that is, increase the turbulence intensity of film surface, to further generate shearing force in film surface, this is helped
In strengthening circulation mixed liquor to the souring of film surface, boundary layer thickness is reduced, concentration polarization is extenuated, inhibits suspension particle
In the deposition of film surface.The addition of microchannel turbulence promoter can also form vortex in film surface, and the increase of turbulence intensity has
Conducive to the counter diffusion for improving deposited suspension particle, promotion is deposited on falling off for film surface cake layer, to reduce cake layer
Accumulating rate, improve and membrane flux and correspondingly extenuate fouling membrane.The micropore of institute's cloth and microchannel on the turbulence promoter of microchannel
It can make suspension particle after film surface deposition, form that resistance to compression is more preferable, the higher cake layer of porosity.Due to microchannel
Turbulence promoter with a thickness of 3mm, 0.3 μm of Kong Wei, and directly contacted with film surface again, easily form anaerobic environment in hole, more have
Conducive to the removal of organic matter.There is a undulatory protrusion on microchannel turbulence promoter surface, as rough surface, and suspension is micro-
Passage turbulent flow promoters easily adsorbs the particle in suspension very much, so that the suspension particle concentration in microchannel increases, and in wave
Line protrusion nearby itself can also generate micro cyclone, when size of the particle size close to micro cyclone, due to not by the limit of wall surface
System, movement can be considered isotropism, flocculation phenomenon easily occur very much, so as to cause grain diameter increase, to be cut by microfiltration membranes
It stays.Microchannel on the turbulence promoter of microchannel can locally cause the variation of speed, i.e., when body fluid enters microchannel, meeting
It causes speed to increase, generates velocity gradient, and the presence of velocity gradient can cause the relative motion of particle in liquid, to cause
The mutual collision of particle so that linear polymer between particle " bridge formation " connection and cause particle to flocculate in the same direction, make
Grain partial size increases, and generates and pushes accumulation, many particles is caused to cannot be introduced into fenestra or be stuck in hole, generates retention and is also less prone to make
At Pore Blocking.In short, the membrane bioreactor for being attached with the microchannel turbulence promoter of micropore can be effectively controlled dissolubility and have
Machine object and small particle hinder the formation of cake layer in the deposition of film surface, so that decelerating membrane pollution, improves membrane flux.
Detailed description of the invention:
Attached drawing 1: for schematic diagram of the invention
Attached drawing 2: the structural schematic diagram of microchannel turbulence promoter
Attached drawing 3: the configuration diagram of microchannel turbulence promoter and plate film assembly
Specific embodiment:
Referring to Fig. 1, a kind of immersed flat plate membrane bioreactor of Additional microchannels turbulence promoter, including biological respinse
Slot, the plate film assembly being arranged in biological reaction tank and microchannel turbulence promoter, microchannel turbulence promoter, which intersects, to be placed
In plate film surface, the aerator below plate film assembly and microchannel turbulence promoter is set, aerator is used and is distributed with
The aeration tube of multiple apertures, the bubble which generates is in the gap of plate film assembly and microchannel turbulence promoter composition
Rise, while sewage being driven to rise the gas flowed, at this time in the gap of plate film assembly and microchannel turbulence promoter composition
Bubble is in slug flow state, and cross-flow needed for film surface cleaning is generated by air agitation, and the underface of film is arranged in aerator, mixes
It closes liquid to flow up with air-flow, generates cross-flow shearing force in film surface, it is possible to reduce fouling membrane, while film surface can be thinned
Wake boundary layer region reduces the concentration polarization phenomenon of film surface.At the same time, the new invention microchannel being added in the design
Turbulence promoter can greatly reduce the boundary layer thickness of film surface and can eliminate concentration polarization phenomenon.Its working principle
Make fluid compared with significantly turbulence is generated under low flow velocity, to make slug flow in board-like film surface for microchannel turbulence promoter
Boundary layer generates periodic unsteady flow, reduces the thickness in boundary layer, to reduce the thickness of concentration boundary layer, reinforces whirlpool
Intensity is revolved, to slow down the pollution and concentration polarization of film, to reduce or prevent fouling membrane.
To sum up, microchannel turbulence promoter is applied in membrane bioreactor, the bubble and upper up-flow for generating aerator
Dynamic sewage is in slug flow state, and as much as possible generate turbulence make to be degraded in sewage generation extracellular polymeric not
It can be gathered in film surface, attachment, and substantially reduce concentration polarization phenomenon, to reduce or remove fouling membrane, improve water outlet water
Matter may be implemented membrane bioreactor and continue efficiently to run.
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| CN109580427B (en) * | 2019-01-14 | 2021-07-23 | 内蒙古工业大学 | An experimental method for simulating microchannel blockage |
| CN110075717B (en) * | 2019-03-20 | 2022-03-04 | 雅安沃克林环保科技有限公司 | Rotary type filtering structure, device and method for reducing pollution of ceramic membrane |
| CN110124551A (en) * | 2019-06-24 | 2019-08-16 | 四川绿沃创新环保工程有限公司 | Improve the device and its process of the gas-liquid two-phase flow of membrane flux |
| CN111439842A (en) * | 2020-05-27 | 2020-07-24 | 天津碧水源膜材料有限公司 | Longitudinal vibration's MBR corrugated membrane device |
| CN112279469A (en) * | 2020-11-11 | 2021-01-29 | 贵州绿纯环境开发有限公司 | A river flood discharge and treatment system |
| CN112426886A (en) * | 2020-11-23 | 2021-03-02 | 西安西热水务环保有限公司 | Low-consumption high-efficiency flat ceramic membrane microfiltration system based on gas-liquid two-phase flow |
| CN114028952A (en) * | 2021-11-10 | 2022-02-11 | 中国石油大学(北京) | Membrane separation device and system that can effectively reduce membrane fouling |
| CN115178190B (en) * | 2022-08-24 | 2024-11-15 | 北京石油化工学院 | Ethanol reforming coupling hydrogen separation device |
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| JP2000093956A (en) * | 1998-09-25 | 2000-04-04 | Matsushita Electric Works Ltd | Water purification tank |
| CN2393872Y (en) * | 1999-11-11 | 2000-08-30 | 王淼 | Limiter for horizontal flow aeration pool |
| CN100460326C (en) * | 2006-03-15 | 2009-02-11 | 南京九思高科技有限公司 | Method of refining salt by membrane filtration |
| CN100428982C (en) * | 2006-05-24 | 2008-10-29 | 江苏久吾高科技股份有限公司 | Immersion type membrane module and membrane filtering device |
| FR2938252B1 (en) * | 2008-11-07 | 2014-08-22 | Otv Sa | METHOD OF TREATING WATER INVOLVING FILTRATION THROUGH AT LEAST ONE IMMERED MEMBRANE |
| CN202410525U (en) * | 2011-12-27 | 2012-09-05 | 北京美华博大环境技术研究院有限公司 | External pressure type hollow fiber membrane ultrafiltration component with anti-pollution structure |
| CN104045176B (en) * | 2014-06-25 | 2015-09-09 | 苏州帝瀚环保科技股份有限公司 | Advanced treatment of industrial waste water filtering system and filter method |
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