CN103463989A - Method for improving membrane separation process efficiency - Google Patents
Method for improving membrane separation process efficiency Download PDFInfo
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- CN103463989A CN103463989A CN2013104306613A CN201310430661A CN103463989A CN 103463989 A CN103463989 A CN 103463989A CN 2013104306613 A CN2013104306613 A CN 2013104306613A CN 201310430661 A CN201310430661 A CN 201310430661A CN 103463989 A CN103463989 A CN 103463989A
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Abstract
The invention relates to a method for improving the membrane separation process efficiency. The method is characterized in that on the foundation of conventional cross flow membrane separation equipment and operation processes, an appropriate pipeline and an appropriate valve are designed, a period type reversing-pulse washing method is adopted to lighten the membrane pollution, and an inlet and an outlet of membrane module raw material liquid are periodically alternately changed at a certain time interval in the membrane filtering process, so that the flowing direction of a feed liquid in a membrane surface is alternately changed; meanwhile, a permeance solution side valve is periodically switched off, the circulating rate of the feed liquid is increased, the feed liquid washes the membrane surface in a high flow rate manner, and the similar backwashing effect is obtained. The method provided by the invention has the advantages that the pollution level of the surface of a membrane is effectively lightened, the penetration flux is increased, the filtering efficiency of the membrane separation equipment is obviously improved, the method is simple and liable, and the method is suitable for popularization and application in industrialized production.
Description
Invention field
The invention belongs to the film separation field, relate to a kind of method that improves film separation process efficiency.
Background technology
In traditional film separation process, feed liquid is advanced from the charging aperture of membrane module, and discharging opening goes out.In long membrane filtration processes, the film caused by the electrostatic effect between concentration polarization, face absorption, particle deposition and solute and face pollutes inevitable.The impact that film pollutes the film separation process gently causes the decline of membrane flux, and the film separative efficiency is low, heavy the performance of film is produced to irreversible destruction, shortens the service life of film, thus the operation and maintenance expense of increase film.Therefore, how to reduce and the pollution that regulates and controls in the film separation process is the key of membrane technology successful Application.
At present, the regulation and control that film is polluted of domestic and international report mainly comprise following two aspects: the firstth, and the methods such as pretreatment (centrifugal, filtration) step suitable by operation conditions optimization (operating pressure, charging rate and turbulent extent), film type (membrane material, surface property and roughness, pore radiuses and distribution and membrane structure etc.), feed liquid performance (concentration, pH) and increase alleviates the impact of film pollution on the film separative efficiency; The secondth, develop advanced film pollution control technology, as gas-liquid two-phase flow (Gas sparging), periodicity backwash (Back-flushing) and pulse backwashing (Back-pulsing) etc.
The backwash technology has been widely used in the film separation process, it is by adopting gas, liquid etc. as the backwash medium, apply opposition to the film pipe, make the pollutant adsorbed in part film surface and fenestra break away from diffusion barrier, thereby a kind of method that flux is recovered, but its operation control technology complexity, and introduce other backwash medium, film is had to potential infringement simultaneously, shorten the service life of film.Our research is found, see through fluid valve by the periodicity opening and closing, increase trapped fluid side valve door simultaneously, make the large flow recurrent pulses of feed liquid wash away the film surface, also can obtain the effect of similar backwash, and needn't introduce external backwash medium, and the infringement of having avoided conventional backwash technology to produce film.It is simple to operate that the recurrent pulses of this employing material liquid own wash away the method on film surface, is applicable to various membrane modules and membrane process, is easy to industrial applications.On the other hand, by feed change liquid alternately, at the flow direction of face, utilize the system fluid mechanics optimization to control also can to reduce film and pollute, realize the efficient operation of membrane process.Its principle is that material liquid enters from the membrane module charging aperture, and the backflow concentrate flows out from discharging opening.At this moment, feed inlet end pressure is high, and the feed inlet end of film is fast because of the rate of filtration, pollutes and increases the weight of gradually, and backflow concentrated solution outlet pressure is lower, and corresponding film pollutes lighter.After a period of time is carried out in filtration, by valve, to switch, the direction of stoste and backflow concentrate is switched.Stoste enters from polluting lighter discharging opening, and discharge port end pressure is high, filters and mainly carries out at discharge port end, feed inlet end pressure is lower, and the backflow concentrate passes through rapidly, and the charging aperture terminal membrane surface of heavy contamination is washed away, pollutant comes off, and the performance of film is recovered.Make the cyclical-transformation of membrane module liquor inlet by the periodicity switch valve, when filtering, face is carried out to more effective flush clean, film is better being worked under state always.This feed liquid reversed flow braking technique is easy and simple to handle, can be used for the multiple film piece-rate system.The present invention proposes a kind of periodicity commutation-pulse technology of washing away and reduces film pollution in micro-filtration, ultrafiltration and nanofiltration separation process, can significantly improve membrane filtration efficiency, has obtained good result.
Summary of the invention
The object of the invention is to provide a kind of method that improves film separation process efficiency on the basis of conventional cross-flow membrane separation equipment and operating procedure, so that the filter efficiency of membrane separation plant is improved.
Technical essential of the present invention is on the basis of conventional cross-flow membrane separation equipment and operating procedure, pipeline and valve by appropriate design, adopting periodic reverse-pulse flushing method to alleviate film pollutes, in membrane filtration processes, under certain time interval, thereby periodically alternately change the import and export of membrane module material liquid, alternately change the flow direction of feed liquid at face.Simultaneously, periodicity is closed through liquid side valve door and is strengthened the feed liquid circulation rate and makes feed liquid wash away the film surface with high flow rate, after maintaining certain hour, sees through liquid side valve door and trapped fluid side valve door and resets, and recovers membrane filtration operation.Feed liquid commutation and pulse are washed away two kinds of operations and are independently carried out separately, and in actual motion, when two kinds of actions conflict, the feed liquid switch operation has precedence over the pulse flush operation.
Film separation process of the present invention comprises micro-filtration, ultrafiltration and nanofiltration; Suitable membrane module form comprises wide runner rolled film, tubular type or doughnut organic film assembly or tubular type inorganic membrane assembly.
Certain time interval of the present invention refers to the flow direction at face every 0.5-4h feed change liquid.
It is to close through liquid side valve door and regulate trapped fluid side valve door every 10-60min the large flow of feed liquid is circulated by membrane module that periodicity of the present invention is closed through liquid side valve door the mode of operation that strengthens the feed liquid circulation rate, after maintaining 1-10min, see through liquid side valve door and trapped fluid side valve door and reset, recover membrane filtration operation.
Periodicity commutation-pulse flushing method provided by the invention has following outstanding feature and advantage:
1, easy to operate, simple;
2, compare efficient low-consume with conventional membrane process.This method can make membrane module with long-play under higher flux, reduces film and cleans frequently, has reduced the use of cleaning agent, has improved the film separative efficiency; And feed liquid periodically commutates and pulse to wash away in process required energy consumption low;
2,, without backwash, avoided backwash to bring external cleansing medium and may damage the problem of film.
Table 1 has compared the membrane filtration efficiency of various materials while adopting respectively conventional cross-flow, reversed flow and periodicity commutation-pulse of the present invention to wash away technology.
The accompanying drawing explanation
Fig. 1 is the membrane separation process schematic flow sheet.
Reference numeral
1. storage tank 2. valve 3. feed pump 4. valve 5. valve 6. membrane module 7. valve 8. valves 9.
The conventional cross-flow of table 1, reversed flow and periodicity commutation-pulse are washed away technical filter efficiency relatively
Valve 10. valve 11. valves 12. see through flow quantity meter 13. and see through liquid storage tank 14. trapped fluid flowmeter 15. dope storage tanks
The specific embodiment
Below in conjunction with embodiment, the present invention will be further described, and theme protection domain involved in the present invention is not limited only to these embodiment.
Embodiment 1: referring to Fig. 1, and a kind of method that improves the membrane process separative efficiency.The vinegar Pei zymotic fluid of take is material liquid, with said method, carries out ultra filtering clarifying, and step is as follows:
(1) Open valve 2,4,8,10 and 11.
(2) open feed pump 3, storing fill with in Cu Pei zymotic fluid to be pumped to molecular cut off be 50000 daltonian wide runner rolling polyamide ultrafiltration modules 6, control valve 8, the transmembrane pressure that makes milipore filter is 0.2MPa.
(3) every 0.5 hour, Open valve 5 and 7, valve-off 4 and 8, change the flow through direction of membrane module of feed liquid, enters the reversed flow pattern.
(4) simultaneously in the process of membrane filtration, every 10min, while making valve 8 or 7(reversed flow pattern) and 9 in full-gear, while valve-off 10 and 11, make the large flow of feed liquid wash away the film surface, after maintaining 1min, valve reset, carry out membrane filtration operation.In case of necessity when fine tuning valve 8 or 7(reversed flow pattern), make transmembrane pressure remain on 0.2MPa and carry out on request to guarantee membrane filtration operation.
(5) so repeatedly operate until stop after ultrafiltration 8h.With conventional continuous ultrafiltration process, compare, this periodic reverse-pulse flush operation can make average permeation flux improve 32%.
Embodiment 2: adopt the device identical with embodiment 1, the vinegar Pei zymotic fluid of take is material liquid, with said method, carries out ultra filtering clarifying, and step is as follows:
(1) Open valve 2,4,8,10 and 11.
(2) open feed pump 3, storing fill with in Cu Pei zymotic fluid to be pumped to molecular cut off be 50000 daltonian doughnut polyamide ultrafiltration modules 6, control valve 8, the transmembrane pressure that makes milipore filter is 0.3MPa.
(3) every 1 hour, Open valve 5 and 7, valve-off 4 and 8, change the flow through direction of membrane module of feed liquid, enters the reversed flow pattern.
(4) simultaneously in the process of membrane filtration, every 30min, while making valve 8 or 7(reversed flow pattern) and 9 in full-gear, while valve-off 10 and 11, make the large flow of feed liquid wash away the film surface, after maintaining 5min, valve reset, carry out membrane filtration operation.In case of necessity when fine tuning valve 8 or 7(reversed flow pattern), make transmembrane pressure remain on 0.3MPa and carry out on request to guarantee membrane filtration operation.
(5) so repeatedly operate until stop after ultrafiltration 8h.With conventional continuous ultrafiltration process, compare, this periodic reverse-pulse flush operation can make average permeation flux improve 23%.
Embodiment 3: adopt the device identical with embodiment 1, take whey as material liquid, carry out nanofiltration with said method concentrated, step is as follows:
(1) Open valve 2,4,8,10 and 11.
(2) open feed pump 3, it is 300 daltonian rolling polyacrylamide nanofiltration assemblies 6 that the whey in the storing filling is pumped to molecular cut off, control valve 8, and the transmembrane pressure that makes milipore filter is 1.5MPa.
(3) every 4 hours, Open valve 5 and 7, valve-off 4 and 8, change the flow through direction of membrane module of feed liquid, enters the reversed flow pattern.
(4) simultaneously in the process of membrane filtration, every 60min, while making valve 8 or 7(reversed flow pattern) and 9 in full-gear, while valve-off 10 and 11, make the large flow of feed liquid wash away the film surface, after maintaining 10min, valve reset, carry out membrane filtration operation.In case of necessity when fine tuning valve 8 or 7(reversed flow pattern), make transmembrane pressure remain on 1.5MPa and carry out on request to guarantee membrane filtration operation.
(5) so repeatedly operate until stop after nanofiltration 8h.With the continuous nanofiltration process of routine, compare, this periodic reverse-pulse flush operation can make average permeation flux improve 15%.
Embodiment 4: adopt the device identical with embodiment 1, take the soy sauce light soy sauce as material liquid, with said method, carry out the micro-filtration clarification, step is as follows:
(1) Open valve 2,4,8,10 and 11.
(2) open feed pump 3, the soy sauce light soy sauce in the storing filling is pumped to the tubular type inorganic ceramic membrane module 6 of 0.02 μ m, control valve 8, and the transmembrane pressure that makes micro-filtration membrane is 0.10MPa.
(3) every 1 hour, Open valve 5 and 7, valve-off 4 and 8, change the flow through direction of membrane module of feed liquid, enters the reversed flow pattern.
(4) simultaneously in the process of membrane filtration, every 20min, while making valve 8 or 7(reversed flow pattern) and 9 in full-gear, while valve-off 10 and 11, make the large flow of feed liquid wash away the film surface, after maintaining 2min, valve reset, carry out membrane filtration operation.In case of necessity when fine tuning valve 8 or 7(reversed flow pattern), make transmembrane pressure remain on 0.10MPa and carry out on request to guarantee membrane filtration operation.
(5) so repeatedly operate until stop after micro-filtration 8h.With conventional continuous Microfiltration process, compare, this periodic reverse-pulse flush operation can make average permeation flux improve 28%.
Claims (4)
1. a method that improves film separation process efficiency, it is characterized in that, on the basis of conventional cross-flow membrane separation equipment and operating procedure, pipeline and valve by appropriate design, adopting periodic reverse-pulse flushing method to alleviate film pollutes, in membrane filtration processes, under certain time interval, thereby periodically alternately change the import and export of membrane module material liquid, alternately change the flow direction of feed liquid at face; Simultaneously, periodicity is closed through liquid side valve door and is strengthened the feed liquid circulation rate and makes feed liquid wash away the film surface with high flow rate; Feed liquid commutation and pulse are washed away two kinds of operations and are independently carried out separately, and in actual motion, when two kinds of actions conflict, the feed liquid switch operation has precedence over the pulse flush operation.
2. method according to claim 1, is characterized in that, described certain time interval is the flow direction at face every 0.5-4h feed change liquid.
3. method according to claim 1, it is characterized in that, it is close through liquid side valve door and tune up trapped fluid side valve door every 10-60min that described periodicity is closed through liquid side valve door the method for operating of regulating the feed liquid circulation rate, make the large flow of feed liquid wash away the film surface by membrane module, after maintaining 1-10min, see through liquid side valve door and trapped fluid side valve door and reset, recover membrane filtration operation.
4. method according to claim 1, is characterized in that, described film separation process comprises micro-filtration, ultrafiltration and nanofiltration; Suitable membrane module form comprises wide runner rolled film, tubular type or doughnut organic film assembly or tubular type inorganic membrane assembly.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474906A (en) * | 2014-11-28 | 2015-04-01 | 海南师范大学 | Method for controlling membrane pollution in pulse feed mode |
| CN105709599A (en) * | 2014-12-01 | 2016-06-29 | 佛山市顺德区美的饮水机制造有限公司 | Filter element, water purification device provided with filter element, and waste water discharge method of filter element |
| CN106995228A (en) * | 2017-06-14 | 2017-08-01 | 海南师范大学 | A kind of membrane distillation method and distilling apparatus of high concentration salt solution |
| CN108273385A (en) * | 2017-11-29 | 2018-07-13 | 三达膜科技（厦门）有限公司 | A kind of forward and reverse nanofiltration processing system of cross-flow loop ultrafiltration |
| CN110876895A (en) * | 2019-11-25 | 2020-03-13 | 合肥信达膜科技有限公司 | Tubular membrane equipment for glutamic acid production |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3411471A1 (en) * | 1984-03-28 | 1985-10-10 | Schleicher & Schuell Gmbh, 3352 Einbeck | Process and apparatus for continuous pressure filtration |
| EP0269444A2 (en) * | 1986-11-26 | 1988-06-01 | Henry B. Kopf | Apparatus and method for mass transfer involving biological/pharmaceutical media |
| CN102198974A (en) * | 2011-05-17 | 2011-09-28 | 同济大学 | On-line automatic cleaning anaerobic microgrid reactor |
-
2013
- 2013-09-18 CN CN201310430661.3A patent/CN103463989B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3411471A1 (en) * | 1984-03-28 | 1985-10-10 | Schleicher & Schuell Gmbh, 3352 Einbeck | Process and apparatus for continuous pressure filtration |
| EP0269444A2 (en) * | 1986-11-26 | 1988-06-01 | Henry B. Kopf | Apparatus and method for mass transfer involving biological/pharmaceutical media |
| CN102198974A (en) * | 2011-05-17 | 2011-09-28 | 同济大学 | On-line automatic cleaning anaerobic microgrid reactor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104474906A (en) * | 2014-11-28 | 2015-04-01 | 海南师范大学 | Method for controlling membrane pollution in pulse feed mode |
| CN105709599A (en) * | 2014-12-01 | 2016-06-29 | 佛山市顺德区美的饮水机制造有限公司 | Filter element, water purification device provided with filter element, and waste water discharge method of filter element |
| CN105709599B (en) * | 2014-12-01 | 2018-10-19 | 佛山市顺德区美的饮水机制造有限公司 | Filter core, the waste water discharge method with its purifier and filter core |
| CN106995228A (en) * | 2017-06-14 | 2017-08-01 | 海南师范大学 | A kind of membrane distillation method and distilling apparatus of high concentration salt solution |
| CN108273385A (en) * | 2017-11-29 | 2018-07-13 | 三达膜科技（厦门）有限公司 | A kind of forward and reverse nanofiltration processing system of cross-flow loop ultrafiltration |
| CN110876895A (en) * | 2019-11-25 | 2020-03-13 | 合肥信达膜科技有限公司 | Tubular membrane equipment for glutamic acid production |
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| CN103463989B (en) | 2015-08-19 |
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