CN1272090C - Air bubble circulation flow type hollow fibrous membrane separating device - Google Patents
Air bubble circulation flow type hollow fibrous membrane separating device Download PDFInfo
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- CN1272090C CN1272090C CN 200410009675 CN200410009675A CN1272090C CN 1272090 C CN1272090 C CN 1272090C CN 200410009675 CN200410009675 CN 200410009675 CN 200410009675 A CN200410009675 A CN 200410009675A CN 1272090 C CN1272090 C CN 1272090C
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- 239000012528 membrane Substances 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000000926 separation method Methods 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000000835 fiber Substances 0.000 claims description 18
- 239000000356 contaminant Substances 0.000 claims description 9
- 239000012510 hollow fiber Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 12
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract 4
- 230000005514 two-phase flow Effects 0.000 abstract 4
- 239000012466 permeate Substances 0.000 abstract 1
- 238000009991 scouring Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 12
- 239000010802 sludge Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000005352 clarification Methods 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
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- 230000001717 pathogenic effect Effects 0.000 description 3
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- 238000012545 processing Methods 0.000 description 2
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention relates to an air bubble circulation flow type hollow fibrous membrane separating device which belongs to the technical field of membrane separating engineering. The present invention is characterized in that the characteristic that gas-liquid two-phase flow can effectively clear pollutant on the surface of a membrane is applied to the practical operation process of membrane separation. A rising pipe generating the gas-liquid two-phase flow and a dropping pipe generating water are communicated through a communicating pipe, and a hollow fibrous membrane installed in the dropping pipe is used for separating and purifying polluted water in the two-phase flow by a gas-liquid circulation flow mode; the hollow fibrous membrane can also be made into an n-shaped structure, and is installed in the rising pipe, and the hollow fibrous membrane in the rising pipe likewise has the function of water generation; compressed air controls pressure intensity in a membrane module through a regulating valve installed on an outer discharging pipeline behind the membrane module to provide pushing power for water to permeate a porous membrane; the gas-liquid two-phase flow between the rising pipe and the dropping pipe realizes natural circulation through pressure difference formed from air bubbles so that a general circulating pump is saved. Due to the scouring action of the circulation flow of the air bubbles for the surface of the porous membrane, the present invention can effectively decelerate the polluting speed rate and the polluting degree of the membrane.
Description
Technical field
The invention belongs to film separation engineering technical field.
Background technology
The separation process of perforated membrane such as ultrafiltration or micro-filtration is to utilize the micropore in the diffusion barrier medium that different component in the liquid is carried out effectively catching, can from water, remove impurity such as particulate, bacterium, virus, also can be used for suspension concentrates, low molecular weight solutes separates with macromolecular, as concentrating of the removal of Separation of Proteins, bacterium and pathogen and biochemical reagents etc.This process near room temperature, is a motive force with the pressure differential usually, generally carries out lock out operation in 0.1 ~ 0.5MPa scope.Separation process has easy and simple to handle, saves energy consumption, and characteristics such as separative efficiency height become the technology that other separation method can not replace in industries such as chemical industry, pharmacy, papermaking, printing and dyeing, food, and its range of application are still in continuous expansion.
Shortage of water resources and water environment pollution are the major issues of modern society, utilize the perforated membrane isolation technics to use it for sewage disposal effectively except that the various impurity in anhydrating, and produce water water quality and can reach water quality standard in the country.As the pretreatment procedure of the reverse osmosis membrane separation of desalinization, guarantee the water supply quality requirement of reverse osmosis unit.Yet the perforated membrane separation process follows the film contamination phenomenon to take place usually, and the permeation flux that causes producing water reduces, and the disposal ability of equipment diminishes.In recent years, water reuse in utilizing perforated membrane to separate to carry out, or present The Enlargement Tendency as the separator that seawater, bitter desalination are carried out in the pre-treatment of counter-infiltration, corresponding separation engineering market constantly enlarges.
In order to guarantee that film separation process continous-stable carries out, make its water source situation that is applicable to different pollution levels, around the operation and the cleaning way of membrane separation device, carried out big quantity research and engineering practice.In the membrane separation device running, use circulating pump and pipeline to constitute the circulatory system usually, make handled water in assembly, flow through the film surface, be deposited on the polluter on film surface after utilizing the souring of fluid to remove to hold back; At membrane module downstream pipeline control valve is installed, controlling opening of valve keeps the pressure difference of perforated membrane both sides, forms the pressure difference of water infiltration by perforated membrane.(with reference to Chinese patent, publication number 1415558; 1310138A) in the film separation operation process, must use circulating pump that energy is provided, could guarantee the flow velocity of feed side water on the film surface, so that reduce the film pollution level, but often cause the separation process operating cost higher.However, film pollutes the permeation flux decay that causes still to be difficult to avoid, and membrane separation device has to carry out the membrane module cleaning and regeneration after operation a period of time.Patent documentation (Chinese patent publication number 1347752; 1418722; 1333080) reported the biphase gas and liquid flow that uses compressed air and water to mix formation,, the perforated membrane permeation flux has been recovered substantially by membrane module being carried out backwash and just washing.The present invention utilizes biphase gas and liquid flow can effectively remove the characteristics of film surface pollution thing, applies it to the actual membrane separation operation process, effectively the speed and the pollution level of decelerating membrane pollution generation.Meanwhile, after compressed air is by membrane module, efflux pipeline, control valve is installed.By controlling opening of valve, accurate pressure in the controlling diaphragm assembly provides the motive force of water infiltration, realizes the film separation operation process.Biphase gas and liquid flow produces inner loop and flows at the inner pressure difference that relies on bubble to form of membrane separation assemblies, saves the circulating pump of conventional film separation process, reaches and saves the energy consumption purpose.Common perforated membrane assembly all can be used for this device, reaches to alleviate the film pollution, improves the aquifer yield and the purpose that cuts down the consumption of energy.
Summary of the invention
The object of the present invention is to provide a kind of speed of effectively decelerating membrane pollution generation and the circulation of bubbles flow model hollow fiber membrane separation device of pollution level.
The invention is characterized in: it contains tedge, and the bottom is provided with contaminant water inlet and gas distributor, and compressed air enters in the tedge by the above-mentioned gas distributor; Connect a pressure control valve at the tedge top; Down-comer, it is two ends and the connection of described tedge up and down, has in the down-comer upper end and produces the mouth of a river, has the discharging mouth of a river on bottom and the tedge connecting line; Hollow-fibre membrane is installed in the described down-comer.
Feature of the present invention also is: it contains tedge, and its downside has the contaminant water inlet, and the bottom is provided with produces the mouth of a river and gas distributor, and compressed air enters in the tedge by the above-mentioned gas distributor; Connect a pressure control valve at the tedge top: down-comer, it is two ends and the connection of described tedge up and down, is provided with a discharging mouth of a river in the down-comer bottom; The inverted U hollow-fibre membrane is installed in the tedge, and its openend is downward, and the width of openend equates with the width of described gas distributor.
This shows that the present invention structurally has following characteristics:
1) tedge and down-comer link mutually, constitute the closed circuit of biphase gas and liquid flow jointly, and hollow-fibre membrane is installed in tedge or down-comer inside.
2) gas flow regulating valve is installed at the tedge top, is controlled liquid pressure in this system, carrying out the hollow-fibre membrane separation process for contaminant water provides motive force.
3) use the compressed air that is pressed into from gas distributor to promote circulating of biphase gas and liquid flow, constantly wash away the hollow-fibre membrane surface with decelerating membrane pollution.
By the above circulation of bubbles type hollow fiber membrane separation device, can from contaminant water, remove polluters such as particulate matter, colloid, pigment, pathogen, algae efficiently, fast, the water quality after the processing reaches middle water reuse index.Because this separator uses physical method to separate fully, the secondary pollution of having avoided conventional water treatment procedure to use chemical agent to bring in a large number obviously reduces operating cost; Compare with existing hollow fiber membrane separation device, use compressed air to promote the biphase gas and liquid flow circulation and separate required pressure reduction with film, save the required drive number of devices, reduce the separation process energy consumption, improve the water treatment procedure economic benefit.This device can use by separate unit, and perhaps several in parallel uses are realized extensive water treatment procedure easily.
Description of drawings
One of Fig. 1 embodiment of the invention:
A-tedge, B-down-comer, C-pressure control valve, D-gas distributor, E-drain valve, F-hollow-fibre membrane, I-raw water pump, J
1And J
2-flowmeter, the former water storage tank of H-, G-air compressor.
Two of Fig. 2 embodiment of the invention:
A-tedge, B-down-comer, C-pressure control valve, D-gas distributor, E-drain valve, F-hollow-fibre membrane, I-raw water pump, J
1, J
2-flowmeter, the former water storage tank of H-, G-air compressor.
Fig. 3. at the compressed air consumption is V=0.4m
3During/h, for the aqueous solution of carbon ink, the water permeation flux is with the variation relation of pressure difference.
Fig. 4. at the compressed air consumption is V=0.8m
3During/h, for the aqueous solution of carbon ink, the water permeation flux is with the variation relation of pressure difference.
Fig. 5. at the compressed air consumption is V=0.4m
3During/h, for the aqueous solution of activated sludge, the water permeation flux is with the variation relation of pressure difference.
Fig. 6. at the compressed air consumption is V=0.8m
3During/h, for the aqueous solution of activated sludge, the water permeation flux is with the variation relation of pressure difference.
The specific embodiment
The related circulation of bubbles type hollow fiber membrane separation device of this invention is made of following flow process.
By raw water pump I the contaminant water among the former water storage tank H is passed through flowmeter J
1After, send into from tedge A bottom; The compressed air that air compressor G sends is through flowmeter J
2After enter the gas distributor D of tedge A bottom, use hydrophobic porous pipe that the polytetrafluoroethylene (PTFE) sintering forms as gas distributor.Contaminant water and compressed air mix, and the liquid that drives down-comer B bottom simultaneously up flows in tedge A so that gas-liquid two-phase is streamed, arrive the laggard promoting the circulation of qi liquid of tedge A upper area and separate, and gas is discharged system from discharge pipe behind pressure control valve C.At tedge A middle part, the liquid entrainment bubble enters down-comer B by connecting piece, flows downward to arrive the formation biphase gas and liquid flow circulation of down-comer B bottom.Hollow-fibre membrane F is installed in (Fig. 1) among the down-comer B, perhaps is installed in tedge A inside (Fig. 2) with the inverted U form.Control this system liquid pressure by the control valve C that is installed on the gas discharge pipe road, the motive force of liquid infiltration by hollow-fibre membrane is provided.Use hollow-fibre membrane except that polluters such as the particulate in anhydrating, colloid, pigment, pathogen, algae, reach the purpose that purifies water, it is standby through the drainpipe outflow system to produce water.The hollow-fibre membrane surface because biphase gas and liquid flow continued to flow is washed continuously to the pollutant that is deposited on the film surface, destroys the film surface and forms gel layer, to a certain degree alleviates film and pollutes, and improves the hollow-fibre membrane permeation flux.
Use the experimental provision that the present invention set up, the activated sludge system with dyeing water solution system and bioanalysis processing contaminant water is an object respectively, measures the water treatment effect of this circulation of bubbles flow model hollow fiber membrane separation device.
Embodiment 1: use 1200 rhizoid external-compression type hollow fibre membrane components, press flow process shown in Fig. 1, carbon ink and running water are mixed the back as the simulated experiment system, at the compressed air consumption is under 0.4 cubic metre of/hour condition, regulate the pressure of raw material by the aperture of control gas dump valve C, measured the variation relation (Fig. 3) of permeation flux with the operation pressure difference.Clarification of water after separating through film is transparent, fully the place to go color of carbon ink, reach the purifying purpose.
Embodiment 2: use 1200 rhizoid external-compression type hollow fibre membrane components, press flow process shown in Fig. 1, carbon ink and running water are mixed the back as the simulated experiment system, at the compressed air consumption is under 0.8 cubic metre of/hour condition, regulate the pressure of raw material by the aperture of control gas dump valve C, measured the variation relation (Fig. 4) of permeation flux with the operation pressure difference.Clarification of water after separating through film is transparent, fully the place to go color of carbon ink, reach the purifying purpose.
Embodiment 3: use 800 rhizoid external-compression type hollow fibre membrane components, press flow process shown in Fig. 1, activated sludge is mixed the back as experimental system with running water, at the compressed air consumption is under 0.4 cubic metre of/hour condition, regulate the pressure of raw material by the aperture of control gas dump valve C, measured the variation relation (Fig. 5) of permeation flux with the operation pressure difference.Clarification of water after the process film separates is transparent, reduces the colourity and the turbidity of former water significantly, reaches the purifying purpose, and the partial analysis index sees Table 1.
Embodiment 4: use 800 rhizoid external-compression type hollow fibre membrane components, press flow process shown in Fig. 1, activated sludge is mixed the back as experimental system with running water, at the compressed air consumption is under 0.8 cubic metre of/hour condition, regulate the pressure of raw material by the aperture of control gas dump valve C, measured the variation relation (Fig. 6) of permeation flux with the operation pressure difference.Clarification of water after the process film separates is transparent, reduces the colourity and the turbidity of former water significantly, reaches the purifying purpose, and the partial analysis index sees Table 1.
The water quality of embodiment 3, embodiment 4 is investigated by colourity, suspension solid content, smell, bacterium microexamination four indices and is estimated the separating property that apparatus of the present invention are handled activated sludge and running water mixture system, the results are shown in following table 1.Listed data show from following 4 projects: apparatus of the present invention can significantly remove polluters such as suspended solid in the water, bacterial body, colourity, have efficient separating property for the sewage system of activated sludge.
Table 1 activated sludge-aqueous systems effluent quality evaluation table
| Former water | Water outlet | Running water | |
| Colourity | 25 | ＜5 | ＜2.5 |
| The suspension solid content | 24.4mg/L | Do not measure | Do not measure |
| Smell | The excitant peculiar smell | Peculiar smell slightly | Do not have |
| The bacterium microexamination | A large amount of live bacterias, planktonic organism | Do not detect | Do not detect |
Claims (2)
1. circulation of bubbles flow model hollow fiber membrane separation device is characterized in that, it contains:
Tedge, bottom are provided with contaminant water inlet and gas distributor, and compressed air enters in the tedge by the above-mentioned gas distributor; Connect a pressure control valve at the tedge top;
Down-comer, it is two ends and the connection of described tedge up and down, has in the down-comer upper end and produces the mouth of a river, has the discharging mouth of a river on bottom and the tedge connecting line;
Hollow-fibre membrane is installed in the described down-comer.
2. circulation of bubbles flow model hollow fiber membrane separation device is characterized in that, it contains:
Tedge, its downside have the contaminant water inlet, and the bottom is provided with produces the mouth of a river and gas distributor, and compressed air enters in the tedge by the above-mentioned gas distributor; Connect a pressure control valve at the tedge top;
Down-comer, it is two ends and the connection of described tedge up and down, is provided with a discharging mouth of a river in the down-comer bottom;
The inverted U hollow-fibre membrane is installed in the tedge, and its openend is downward, and the width of openend equates with the width of described gas distributor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009675 CN1272090C (en) | 2004-10-15 | 2004-10-15 | Air bubble circulation flow type hollow fibrous membrane separating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009675 CN1272090C (en) | 2004-10-15 | 2004-10-15 | Air bubble circulation flow type hollow fibrous membrane separating device |
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| Publication Number | Publication Date |
|---|---|
| CN1621135A CN1621135A (en) | 2005-06-01 |
| CN1272090C true CN1272090C (en) | 2006-08-30 |
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|---|---|---|---|
| CN 200410009675 Expired - Fee Related CN1272090C (en) | 2004-10-15 | 2004-10-15 | Air bubble circulation flow type hollow fibrous membrane separating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538532B (en) * | 2009-04-23 | 2012-02-15 | 南京工业大学 | External circulation air stripping type membrane bioreactor |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010050815A1 (en) * | 2008-10-30 | 2010-05-06 | Paques Bio Systems B.V. | Method for the filtration of a bioreactor liquid from a bioreactor; cross-flow membrane module, and bioreactor membrane system |
| CN101874985B (en) * | 2009-04-28 | 2013-02-06 | 吕晓龙 | Film evaporation concentrating method and device |
| CN106409354B (en) * | 2016-09-28 | 2018-01-19 | 哈尔滨工程大学 | A kind of passive heat derives system of open type being applied under longtime running operating mode |
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2004
- 2004-10-15 CN CN 200410009675 patent/CN1272090C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101538532B (en) * | 2009-04-23 | 2012-02-15 | 南京工业大学 | External circulation air stripping type membrane bioreactor |
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| CN1621135A (en) | 2005-06-01 |
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