DE19502516C1 - Membrane filter cleaning process - Google Patents
Membrane filter cleaning processInfo
- Publication number
- DE19502516C1 DE19502516C1 DE19502516A DE19502516A DE19502516C1 DE 19502516 C1 DE19502516 C1 DE 19502516C1 DE 19502516 A DE19502516 A DE 19502516A DE 19502516 A DE19502516 A DE 19502516A DE 19502516 C1 DE19502516 C1 DE 19502516C1
- Authority
- DE
- Germany
- Prior art keywords
- liquid
- liquid medium
- membrane
- flushing
- jet
- 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.)
- Expired - Fee Related
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims description 14
- 238000004140 cleaning Methods 0.000 title 1
- 235000013305 food Nutrition 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000013405 beer Nutrition 0.000 claims abstract description 3
- 239000002826 coolant Substances 0.000 claims abstract description 3
- 239000008267 milk Substances 0.000 claims abstract description 3
- 235000013336 milk Nutrition 0.000 claims abstract description 3
- 210000004080 milk Anatomy 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 46
- 238000011010 flushing procedure Methods 0.000 claims description 8
- 238000005374 membrane filtration Methods 0.000 claims description 4
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims description 2
- 235000021395 porridge Nutrition 0.000 claims description 2
- 244000000626 Daucus carota Species 0.000 claims 1
- 235000002767 Daucus carota Nutrition 0.000 claims 1
- 239000000149 chemical water pollutant Substances 0.000 claims 1
- 239000002351 wastewater Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 abstract 4
- 235000013399 edible fruits Nutrition 0.000 abstract 1
- 235000015192 vegetable juice Nutrition 0.000 abstract 1
- 239000000706 filtrate Substances 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000021 stimulant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/025—Removal of membrane elements before washing
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23C—DAIRY PRODUCTS, e.g. MILK, BUTTER OR CHEESE; MILK OR CHEESE SUBSTITUTES; MAKING OR TREATMENT THEREOF
- A23C9/00—Milk preparations; Milk powder or milk powder preparations
- A23C9/14—Milk preparations; Milk powder or milk powder preparations in which the chemical composition of the milk is modified by non-chemical treatment
- A23C9/142—Milk preparations; Milk powder or milk powder preparations in which the chemical composition of the milk is modified by non-chemical treatment by dialysis, reverse osmosis or ultrafiltration
- A23C9/1422—Milk preparations; Milk powder or milk powder preparations in which the chemical composition of the milk is modified by non-chemical treatment by dialysis, reverse osmosis or ultrafiltration by ultrafiltration, microfiltration or diafiltration of milk, e.g. for separating protein and lactose; Treatment of the UF permeate
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
- A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Preparation or treatment thereof
- A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
- A23L2/72—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration
- A23L2/74—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter by filtration using membranes, e.g. osmosis, ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12H—PASTEURISATION, STERILISATION, PRESERVATION, PURIFICATION, CLARIFICATION OR AGEING OF ALCOHOLIC BEVERAGES; METHODS FOR ALTERING THE ALCOHOL CONTENT OF FERMENTED SOLUTIONS OR ALCOHOLIC BEVERAGES
- C12H1/00—Pasteurisation, sterilisation, preservation, purification, clarification, or ageing of alcoholic beverages
- C12H1/02—Pasteurisation, sterilisation, preservation, purification, clarification, or ageing of alcoholic beverages combined with removal of precipitate or added materials, e.g. adsorption material
- C12H1/06—Precipitation by physical means, e.g. by irradiation, vibrations
- C12H1/063—Separation by filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/30—Mechanical cleaning, e.g. with brushes or scrapers
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Nutrition Science (AREA)
- Toxicology (AREA)
- Biochemistry (AREA)
- Bioinformatics & Cheminformatics (AREA)
- General Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Genetics & Genomics (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Membranfiltra tion nach Anspruch 1 des Hauptpatents DE 44 13 640 C1.The invention relates to a method for membrane filtration tion according to claim 1 of the main patent DE 44 13 640 C1.
Im Zuge der Weiterentwicklung hat sich gezeigt, daß das System auch zur Erzeugung eines Filtratstromes aus flüssigen Medien wie Emulsionen, Säften und Breien, wie sie z. B. in der Nahrungs mittelindustrie vorkommen, bestens geeignet ist. Auch kann es sich bei dem flüssigen Medium um Bier oder Milch handeln.In the course of further development has been shown that the system for Generation of a filtrate stream from liquid media such as Emulsions, juices and porridges such as B. in food medium-sized industry, is ideally suited. Can too the liquid medium is beer or milk.
Zur Gewinnung eines weitgehend bakterien- und algenfreien Fil tratstromes aus flüssigem Medium sind Membranfilteranlagen bekannt, die auf dem sogenannten Querstromprinzip beruhen. Dabei wird ein flüssiges Medium mit hoher Geschwindigkeit durch eine Rohrmembran hindurchgepumpt, wobei der entstehende Belag auf der Membran durch den Flüssigkeitsstrom ständig langsam weitertransportiert und dadurch ein schnelles Zusetzten der Membran vermieden wird. Das Filtrat tritt nach außen durch die Rohrmembran hindurch und wird in einem Mantelrohr aufgefangen.To obtain a largely bacteria and algae free fil Pedal flow from liquid medium are membrane filter systems known, which are based on the so-called cross-flow principle. Here becomes a liquid medium at high speed through a Pipe membrane pumped through, the resulting coating on the Membrane constantly slow through the flow of liquid transported and thereby a fast clogging of the Membrane is avoided. The filtrate passes through the outside Pipe membrane through and is caught in a jacket tube.
Diese Filtersysteme sind für die Nahrungsmittelindustrie häufig ungeeignet, da die für das Verfahren erforderliche große Menge des flüssigen Mediums nicht zur Verfügung steht.These filter systems are common in the food industry unsuitable because of the large amount required for the process of the liquid medium is not available.
Des weiteren sind Filterverfahren bekannt, bei denen das flüssige Medium in einzelnen, aufeinanderfolgenden Chargen durch ein Pa pierbandfilter geschickt und auf diese Weise Filtrat erzeugt wird. Das Papierband läuft nach der Filtration jeder Charge auto matisch weiter.Furthermore, filter processes are known in which the liquid Medium in individual, successive batches by a pa pierbandfilter sent and in this way generated filtrate becomes. The paper tape runs automatically after the filtration of each batch matically further.
Nachteilig bei diesem Verfahren ist der ständige Verbrauch von Filterpapier und die damit verbundenen laufenden Betriebskosten. Außerdem muß das flüssige Medium zunächst vom Vorratsbehälter zum Papierbandfilter transportiert werden, wozu z. T. ein erheblicher apparativer Aufwand nötig ist.The disadvantage of this method is the constant consumption of Filter paper and the associated running costs. In addition, the liquid medium must first from the reservoir to Paper belt filters are transported, for which purpose. T. a considerable one apparatus expenditure is necessary.
Der in den Patentansprüchen 1, 2 und 3 angegebenen Erfindung liegt das Problem zugrunde, auch mit kleinen Mengen von Nahrungs- oder Genußmittel, Kühlmittel oder verseuchtem Wasser auskommen zu müssen und den apparativen Aufwand sowie die laufenden Betriebs kosten zu minimieren.The invention specified in claims 1, 2 and 3 the problem is underlying, even with small amounts of food or Stimulants, coolants or contaminated water get along need and the equipment effort and ongoing operations to minimize costs.
Dieses Problem wird durch die in den Patentansprüchen 1, 2 und 3 aufgeführten Merkmale gelöst.This problem is solved by the in claims 1, 2 and 3 listed features solved.
Wesentliches Bestandteil des Membranfiltersystems ist ein Fil terelement, das beim Filterbetrieb direkt in den Vorratsbehälter eingebracht wird, der das flüssige Medium enthält. Dadurch wird eine zusätzliche Zuführungspumpe überflüssig. Außerdem läßt sich das Filterelement aufgrund seiner Konzeption in Größe und Form nahezu beliebig ausbilden und damit an unterschiedliche Vorrats behälter anpassen. An essential part of the membrane filter system is a fil terelement that goes directly into the storage container during filter operation is introduced, which contains the liquid medium. This will an additional feed pump is unnecessary. In addition, the filter element due to its conception in size and shape train almost any number of different stocks adjust container.
Sobald sich die Filtermembran zusetzt, wird das komplette Fil terelement mit Hilfe einer Hebevorrichtung aus dem flüssigen Medium gehoben und an einem Flüssigkeitsstrahl vorbeigeführt. Eine entsprechend ausgebildete Düse fächert den Strahl auf, so daß er die ganze Breite des Filterelementes überstreichen kann. Dabei wird die auf der Membranoberfläche abgelagerte Partikel-, Fett- oder Kolloidschicht durch den Flüssigkeitsstrahl heruntergespült. Nach dem Freispülen wird das gereinigte Filterelement wieder in das Medium abgesenkt und bringt wieder die ursprüngliche Filtratleistung.As soon as the filter membrane clogs up, the complete fil terelement with the help of a lifting device from the liquid Medium lifted and passed a jet of liquid. An appropriately trained nozzle fans out the jet, so that he can cover the entire width of the filter element. Here is the deposited on the membrane surface particle, fat or Colloid layer washed down by the liquid jet. After flushing, the cleaned filter element is in again the medium is lowered and brings back the original Filtrate output.
Bei einer Ausgestaltung nach Anspruch 4 wird zwischen Filterele ment und Vorratsbehälter eine Auffangvorrichtung geschoben, so bald das Filterelement aus dem Vorratsbehälter mit dem flüssigen Medium herausgehoben wurde. Erst dann wird der Flüssigkeitsstrahl eingeschaltet. Die Abspülflüssigkeit wird in der Auffangvorrich tung aufgefangen und gesondert abgeleitet. Eine Verunreinigung des flüssigen Mediums mit Abspülflüssigkeit wird auf diese Weise vermieden. Vor dem Wiederabsenken des Filterelementes in den Vor ratsbehälter wird die Auffangvorrichtung wieder abgezogen.In an embodiment according to claim 4 is between Filterele ment and storage container pushed a collecting device, so soon the filter element from the reservoir with the liquid Medium was lifted out. Only then will the liquid jet switched on. The rinsing liquid is in the drip pan tion collected and derived separately. A pollution the liquid medium with rinsing liquid is in this way avoided. Before lowering the filter element into the front the container is pulled off again.
Bei einer Ausgestaltung nach Anspruch 5 wird das Filterelement von seiner Position über dem flüssigen Medium wegbewegt und über eine Auffangvorrichtung geführt, sobald es aus dem Medium heraus gehoben wurde. Erst dann wird der Flüssigkeitsstrahl eingeschal tet. Die Abspülflüssigkeit wird in der Auffangvorrichtung aufge fangen und gesondert abgeleitet. Nach Beendigung des Freispül vorganges wird das Filterelement wieder über das flüssige Medium geführt und anschließend in dieses abgesenkt.In an embodiment according to claim 5, the filter element moved away from its position over the liquid medium and over a catcher is guided once it is out of the medium was raised. Only then is the liquid jet shuttered tet. The rinsing liquid is picked up in the collecting device catch and derived separately. At the end of the flush process, the filter element is again on the liquid medium led and then lowered into this.
Claims (6)
- - ein aus Filtermembran und Trägerplatte bestehendes Filterelement direkt in ein Becken, Gerinne oder in einen sonstigen Vorratsbehälter eingebracht wird,
- - zur Filtratgewinnung zwischen Filtermembran und Trägerplatte mittels einer Pumpe ein Unterdruck erzeugt wird und
- - die Filtermembran intervallweise durch einen von außen auf die Membranfläche auftreffenden Flüssigkeitsstrahl freigespült wird (nach Hauptpatent P 44 13 640.4-41) dadurch gekennzeichnet, daß das flüssige Medium ein Nahrungs- oder Genußmittel ist.
- a filter element consisting of filter membrane and carrier plate is introduced directly into a basin, channel or into another storage container,
- - A vacuum is generated between the filter membrane and the support plate by means of a pump and
- - The filter membrane is flushed out at intervals by a liquid jet hitting the membrane surface from the outside (according to main patent P 44 13 640.4-41), characterized in that the liquid medium is a foodstuff or luxury food.
- - ein aus Filtermembran und Trägerplatte bestehendes Filterelement direkt in ein Becken, Gerinne oder in einen sonstigen Vorratsbehälter eingebracht wird,
- - zur Filtratgewinnung zwischen Filtermembran und Trägerplatte mittels einer Pumpe ein Unterdruck erzeugt wird und
- - die Filtermembran intervallweise durch einen von außen auf die Membranfläche auftreffenden Flüssig keitsstrahl freigespült wird (nach Hauptpatent P 44 13 640.4-41) dadurch gekennzeichnet, daß das flüssige Medium ein Kühlmittel ist.
- a filter element consisting of filter membrane and carrier plate is introduced directly into a basin, channel or into another storage container,
- - A vacuum is generated between the filter membrane and the support plate by means of a pump and
- - The filter membrane is flushed at intervals by an incident liquid from the outside onto the membrane surface (according to main patent P 44 13 640.4-41), characterized in that the liquid medium is a coolant.
- - ein aus Filtermembran und Trägerplatte bestehendes Filterelement direkt in ein Becken, Gerinne oder in einen sonstigen Vorratsbehälter eingebracht wird,
- - zur Filtratgewinnung zwischen Filtermembran und Trägerplatte mittels einer Pumpe ein Unterdruck erzeugt wird und
- - die Filtermembran intervallweise durch einen von außen auf die Membranfläche auftreffenden Flüssig keitsstrahl freigespült wird (nach Hauptpatent P 44 13 640.4-41) dadurch gekennzeichnet, daß das flüssige Medium verseuchtes Wasser, wie Deponiesickerwasser ist.
- a filter element consisting of filter membrane and carrier plate is introduced directly into a basin, channel or into another storage container,
- - A vacuum is generated between the filter membrane and the support plate by means of a pump and
- - The filter membrane is flushed at intervals by an incident on the outside of the membrane surface liquid jet jet (according to main patent P 44 13 640.4-41), characterized in that the liquid medium is contaminated water, such as landfill leachate.
- - vor dem Zuschalten des Flüssigkeitsstrahles zwischen das Filterelement und das flüssige Medium eine Auf fangvorrichtung geschoben wird, die die Freispülflüs sigkeit auffängt und gesondert ableitet und so ein Hineinlaufen der Freispülflüssigkeit in das flüssige Medium verhindert, und
- - nach Beendigung des Freispülvorganges vor dem Wieder absenken des Filterelementes in das flüssige Medium die Auffang vorrichtung wieder entfernt wird.
- - Before switching on the liquid jet between the filter element and the liquid medium, a catcher is pushed on, which collects the liquid Freispülflüs and derives separately and thus prevents the free-flushing liquid from running into the liquid medium, and
- - After completion of the flushing process before lowering the filter element in the liquid medium, the collecting device is removed again.
- - vor dem Zuschalten des Flüssigkeitsstrahles das Fil terelement aus dem flüssigen Medium entfernt und über eine Auffangvorrichtung geführt wird, die die Freispülflüssigkeit auffängt und gesondert ableitet, wodurch ein Hineinlaufen der Freispülflüssigkeit in das flüssige Medium verhindert wird, und
- - nach Beendigung des Freispülvorganges das Filterele ment wieder über das flüssige Medium geführt und in dasselbe abgesenkt wird.
- - Before switching on the liquid jet, the fil terelement is removed from the liquid medium and guided over a collecting device which collects and separately derives the flushing liquid, thereby preventing the flushing liquid from entering the liquid medium, and
- - After completion of the flushing process, the Filterele element is again guided over the liquid medium and lowered into the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19502516A DE19502516C1 (en) | 1994-04-20 | 1995-01-27 | Membrane filter cleaning process |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19944413640 DE4413640C1 (en) | 1994-04-20 | 1994-04-20 | Process for membrane filtration of waste water |
| DE19502516A DE19502516C1 (en) | 1994-04-20 | 1995-01-27 | Membrane filter cleaning process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19502516C1 true DE19502516C1 (en) | 1997-01-30 |
Family
ID=6515908
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19944413640 Expired - Fee Related DE4413640C1 (en) | 1994-04-20 | 1994-04-20 | Process for membrane filtration of waste water |
| DE19502516A Expired - Fee Related DE19502516C1 (en) | 1994-04-20 | 1995-01-27 | Membrane filter cleaning process |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19944413640 Expired - Fee Related DE4413640C1 (en) | 1994-04-20 | 1994-04-20 | Process for membrane filtration of waste water |
Country Status (1)
| Country | Link |
|---|---|
| DE (2) | DE4413640C1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7534353B2 (en) | 1995-08-11 | 2009-05-19 | Zenon Technology Partnership | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| US7537701B2 (en) | 1995-08-11 | 2009-05-26 | Zenon Technology Partnership | Membrane filtration module with adjustable header spacing |
| USRE42669E1 (en) | 1995-08-11 | 2011-09-06 | Zenon Technology Partnership | Vertical cylindrical skein of hollow fiber membranes and method of maintaining clean fiber surfaces |
| US8852438B2 (en) | 1995-08-11 | 2014-10-07 | Zenon Technology Partnership | Membrane filtration module with adjustable header spacing |
| CN112604503A (en) * | 2020-11-13 | 2021-04-06 | 水迈源膜科技南通有限公司 | Membrane filtration backflushing device and use method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4413640C1 (en) * | 1994-04-20 | 1995-05-11 | Rainer Mehlitz | Process for membrane filtration of waste water |
| DE19703877C1 (en) * | 1997-02-03 | 1998-02-12 | Kai Hoehn | Cleaning water effluent cross-flow filter membrane |
| DE102015220553A1 (en) * | 2015-10-21 | 2017-04-27 | Itn Nanovation Ag | Method for cleaning a porous membrane |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4413640C1 (en) * | 1994-04-20 | 1995-05-11 | Rainer Mehlitz | Process for membrane filtration of waste water |
-
1994
- 1994-04-20 DE DE19944413640 patent/DE4413640C1/en not_active Expired - Fee Related
-
1995
- 1995-01-27 DE DE19502516A patent/DE19502516C1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4413640C1 (en) * | 1994-04-20 | 1995-05-11 | Rainer Mehlitz | Process for membrane filtration of waste water |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7534353B2 (en) | 1995-08-11 | 2009-05-19 | Zenon Technology Partnership | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| US7537701B2 (en) | 1995-08-11 | 2009-05-26 | Zenon Technology Partnership | Membrane filtration module with adjustable header spacing |
| US7615157B2 (en) | 1995-08-11 | 2009-11-10 | Zenon Technology Partnership | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| USRE42669E1 (en) | 1995-08-11 | 2011-09-06 | Zenon Technology Partnership | Vertical cylindrical skein of hollow fiber membranes and method of maintaining clean fiber surfaces |
| US8075776B2 (en) | 1995-08-11 | 2011-12-13 | Zenon Technology Partnership | Apparatus for withdrawing permeate using an immersed vertical skein of hollow fibre membranes |
| US8852438B2 (en) | 1995-08-11 | 2014-10-07 | Zenon Technology Partnership | Membrane filtration module with adjustable header spacing |
| CN112604503A (en) * | 2020-11-13 | 2021-04-06 | 水迈源膜科技南通有限公司 | Membrane filtration backflushing device and use method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4413640C1 (en) | 1995-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8100 | Publication of the examined application without publication of unexamined application | ||
| AF | Is addition to no. |
Ref country code: DE Ref document number: 4413640 Format of ref document f/p: P |
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| D1 | Grant (no unexamined application published) patent law 81 | ||
| 8364 | No opposition during term of opposition | ||
| 8340 | Patent of addition ceased/non-payment of fee of main patent |