DE4002507C2 - - Google Patents
Info
- Publication number
- DE4002507C2 DE4002507C2 DE4002507A DE4002507A DE4002507C2 DE 4002507 C2 DE4002507 C2 DE 4002507C2 DE 4002507 A DE4002507 A DE 4002507A DE 4002507 A DE4002507 A DE 4002507A DE 4002507 C2 DE4002507 C2 DE 4002507C2
- Authority
- DE
- Germany
- Prior art keywords
- filter
- drain pipe
- drum
- water
- filter material
- 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 - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000001681 protective effect Effects 0.000 claims description 3
- 229920000426 Microplastic Polymers 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 12
- 239000000126 substance Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 8
- 238000004062 sedimentation Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 210000004197 pelvis Anatomy 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/04—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being clamped between pervious fixed walls
- B01D24/08—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being clamped between pervious fixed walls the filtering material being supported by at least two pervious coaxial walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
- B01D24/4673—Regenerating the filtering material in the filter by moving the filtering element using rotary devices or vibration mechanisms, e.g. stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/114—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for inward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Description
Die Erfindung betrifft eine Filtereinrichtung zur Reinigung von Abwasser, die im wesentlichen aus mindestens einer unterhalb des Wasserspiegels in einem mit einem Wasserzulauf versehenen Absetzbecken angeordneten, drehbaren Filtertrommel besteht, die einen siebartigen Trommelmantel sowie eine als Ablaufrohr vorgesehene und in den Seitenwänden des Absetzbeckens gelagerte Trommelachse aufweist, wobei der Filterraum zwischen Trommelmantel und Ablaufrohr mindestens teilweise mit körnigem Filtermaterial gefüllt und das Ablaufrohr mindestens an einer Seite verschließbar ist.The invention relates to a filter device for cleaning of wastewater consisting essentially of at least one below the water level in one with one Arranged sedimentation basin, rotatable filter drum, which is a sieve-like Drum shell and a drain pipe provided and drum axis mounted in the side walls of the settling tank has, the filter space between the drum shell and drain pipe at least partially with granular Filter material filled and the drain pipe at least can be closed on one side.
Bei der Abwasserreinigung und bei der Wasseraufbereitung werden im Wasser enthaltene Feinststoffe, die wegen ihrer geringen Absetzgeschwindigkeit durch Sedimentation in Absetzbecken nicht aus dem Wasser entfernt werden, durch Filtersysteme unterschiedlicher Art zurückgehalten. Solche bekannten Filter sind mit Stoff- oder Metallgeweben bespannte Trommel- oder Plattenfilter sowie auf horizontalen Stützgerüsten aufgebaute Filterschichten aus Sand oder anderen Filtermaterialien.For wastewater treatment and water treatment are fine substances contained in the water that because their slow sedimentation rate not removed from water in sedimentation tanks through filter systems of different types held back. Such known filters are made with or metal mesh covered drum or plate filters as well as built on horizontal scaffolding Filter layers made of sand or other filter materials.
Die Reinigung dieser Filter erfolgt bei Unterbrechung des Filtervorganges durch Absprühen oder Absaugen der auf Trommel- oder Plattenfilter zurückgehaltenen Feinststoffe sowie durch Ausspülen und Durchblasen der mit Feinststoffen angereicherten Filterschichten aus Sand oder anderen Filtermaterialien mit Druckwasser oder Druckluft. Das mit Feinststoffen angereicherte Spülwasser wird zu getrennten Reinigungsanlagen abgeleitet. Um in Absetzbecken nicht sedimentierte Feinststoffe zurückzuhalten, wird vorgeschlagen, ein Ablauffilter einzusetzen.These filters are cleaned when they are interrupted the filtering process by spraying or vacuuming the retained on drum or plate filters Fine substances and by rinsing and blowing through the filter layers enriched with fine substances Sand or other filter materials with pressurized water or compressed air. The one enriched with fine substances Rinse water is diverted to separate cleaning systems. For fine substances not sedimented in sedimentation tanks withholding, it is suggested a drain filter to use.
Ein derartiges, gattungsgemäßes Ablauffilter ist in der DE-OS 24 47 597 beschrieben und ist als zylindrischer Körper ausgebildet, der eine zentrische gelochte oder geschlitzte, horizontal gelagerte Ablaufrohrachse besitzt und dessen Mantel aus Sieb- oder Drahtgewebe besteht. Scheiben oder Speichenräder, in Abständen auf der Rohrachse montiert, halten den Siebblech- oder Drahtgewebemantel der zylindrischen Filtertrommel, die mit Filtermaterial, vorzugsweise Kunststoffgranulat, soweit gefüllt ist, daß nur ein oberes Kreissegment frei bleibt. Such a generic drain filter is in the DE-OS 24 47 597 described and is cylindrical Body formed of a centric perforated or has slotted, horizontally mounted drain pipe axis and whose jacket consists of sieve or wire mesh. Discs or spoke wheels, at intervals the pipe axis mounted, hold the screen plate or Wire mesh jacket of the cylindrical filter drum, the with filter material, preferably plastic granulate, is filled so far that only an upper segment of a circle remains free.
Die zylindrische Filtertrommel wird um die Rohrachse drehbar im Absetzbecken zumindest bis zur Füllhöhe des Filtermaterials im Wasser eingetaucht angeordnet. Das Wasser im Absetzbecken fließt durch den zylindrischen Filterkörper zur Ablaufrohrachse, durch die das gefilterte Wasser abgeleitet wird. Bei zunehmender Anreicherung des Filtermaterials durch zurückgehaltene Feinststoffe erfolgt nach Absperrung des zentrischen Ablaufrohres die Reinigung des Filtermaterials dadurch, daß die horizontal gelagerte zylindrische Filtertrommel langsam in Rotation versetzt wird. Infolge des nicht vollständig gefüllten Filterraumes rollt dabei das körnige Filtermaterial im Filterraum ab. Die dabei erzeugte Turbulenz des Wassers spült die Feinststoffe vom Filtermaterial ab. Diese sinken durch das Sieb- oder Drahtgewebe der Zylindertrommel zur Beckensohle ab.The cylindrical filter drum is around the pipe axis rotatable in the settling tank at least up to the level of the Filter material arranged immersed in water. The Water in the sedimentation tank flows through the cylindrical one Filter body to the drain pipe axis through which the filtered Water is drained. With increasing enrichment of the filter material due to retained fine substances takes place after the central drain pipe is shut off the cleaning of the filter material in that the horizontally mounted cylindrical filter drum is slowly rotated. As a result of not completely granular filter room rolls the granular Filter material in the filter room. The one created Turbulence of the water rinses off the fine substances Filter material. These sink through the sieve or Wire mesh from the cylinder drum to the bottom of the pelvis.
Beim Einsatz dieses Ablauffiltersystems hat sich jedoch gezeigt, daß nach der Reinigung des zylindrischen Filterkörpers durch Rotation Feinststoffe in der zentrischen Ablaufrohrachse verbleiben, die nach Wiederinbetriebnahme des Filters mit dem gefilterten Wasser abfließen und so die Reinigungsleistung beeinträchtigen. Desweiteren ist das Filtermaterial im Filterkörper oft so festgelagert, daß die Ausspülung der Feinststoffe beim Waschvorgang durch Rotation des Filterkörpers sehr langsam verläuft. Der Einbau der Ablauffilter direkt in Absetzbecken führt zudem zu einer verfahrenstechnischen Kombination des Absetz- und Filtervorganges in einer Einheit, die nicht für beide Vorgänge gleich zweckmäßig ausgelegt werden kann.When using this drain filter system However, it has been shown that after cleaning the cylindrical Filter body by rotating fine particles in the centric drain pipe axis remain, which after Recommission the filter with the filtered one Drain water and impair the cleaning performance. Furthermore, the filter material is in the filter body often stored so tightly that the flushing out of the Fine substances during the washing process by rotating the filter body runs very slowly. The installation of the drain filter directly in sedimentation tanks also leads to a procedural combination of the settling and filtering process in one unit, not for both operations can be interpreted appropriately.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Filtereinrichtung mit drehbarer Filtertrommel zu schaffen, bei der während des Spülvorganges die Wasserzufuhr nicht unterbrochen werden muß und die darüber hinaus eine eindeutige Trennung von gereinigtem und ungereinigtem Wasser erlaubt.The invention is therefore based on the object To create a filter device with a rotatable filter drum, with the water supply during the rinsing process does not have to be interrupted and beyond that a clear separation of cleaned and unpurified Water allowed.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Ablaufrohr beidseitig verschließbar ausgebildet ist.This object is achieved in that the drain pipe can be closed on both sides is.
So wird zur Trennung von gereinigtem und nicht gereinigtem Wasser ohne Unterbrechung des Wasserzulaufs bei der Reinigung des Filtermaterials und Rotation der Filtertrommel die beim Filtervorgang geschlossene Spülstromseite des Ablaufrohrs geöffnet und die gegenüberliegende, beim Filtervorgang geöffnete Ablaufseite geschlossen. Das Ablaufrohr ist in zweckmäßiger Weise durch Schieber oder Schütztafeln verschließbar.This is how to separate the cleaned from the unpurified Water without interrupting the water supply cleaning the filter material and rotating the filter drum the flushing flow side closed during the filtering process of the drain pipe opened and the opposite, drainage side open during filtering process closed. The drain pipe is convenient can be closed by sliders or protective panels.
Nach einer besonders vorteilhaften Ausgestaltung der Erfindung können in einem Absetzbecken mehrere Filtertrommeln hintereinander angeordnet werden.According to a particularly advantageous embodiment of the Invention can multiple filter drums in a settling tank be arranged one behind the other.
Weiterhin erweist es sich im Rahmen der Erfindung als sehr vorteilhaft, daß als Filtermaterial Kunststoffgranulat mit einem spezifischen Gewicht geringer als Wasser vorsehbar ist.Furthermore, it proves to be within the scope of the invention very advantageous that plastic granules as the filter material with a specific weight less than water is predictable.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden näher erläutert. An embodiment of the invention is in the drawings shown and is explained in more detail below.
Es zeigtIt shows
Fig. 1 einen Schnitt durch ein Absetzbecken mit einer Filtertrommel und Fig. 1 shows a section through a settling tank with a filter drum and
Fig. 2 einen Schnitt durch ein Absetzbecken mit mehreren Filtertrommeln. Fig. 2 shows a section through a settling tank with several filter drums.
Vor dem Reinigungsvorgang wird die Ablaufseite 2 der Filtertrommel 1 durch Schieber oder Schütztafeln geschlossen. Die gegenüberliegende Spülstromseite 3 des zentrischen Ablaufrohres 4 wird durch entsprechende Schieber oder Schütztafeln geöffnet, so daß beim reinigenden Rotationsvorgang der Filtertrommel ein stetiger Spülstrom die Ablagerung von Feinststoffen im zentrischen Ablaufrohr verhindert und diese zu einer getrennten Reinigungsanlage ableitet.Before the cleaning process, the discharge side 2 of the filter drum 1 is closed by slides or protective panels. The opposite rinsing flow side 3 of the central drain pipe 4 is opened by corresponding slides or contactor plates, so that during the cleaning rotating process of the filter drum, a constant rinsing flow prevents the deposition of fine substances in the central drain pipe and leads them to a separate cleaning system.
Nach dem Reinigungsvorgang wird die Spülstromseite 3 geschlossen und danach die Ablaufseite 2 wieder geöffnet, womit wiederum gefiltertes Wasser abfließt.After the cleaning process, the rinsing flow side 3 is closed and then the outlet side 2 is opened again, which in turn causes filtered water to flow off.
Die Reinigung des Filtermaterials durch Rotation der Filtertrommel 1 wird dadurch verbessert, daß in der Filtertrommel parallel zur Ablaufrohrachse Querstege 5, gleicher oder unterschiedlicher Form, so angeordnet werden, daß diese bei der Rotation der Filtertrommel aufreißenden Filtermaterialkörper und eine turbulente Vermischung und damit stärkere Spülung des Filtermaterials bewirken. The cleaning of the filter material by rotation of the filter drum 1 is improved in that transverse webs 5 , of the same or different shape, are arranged in the filter drum parallel to the drain pipe axis in such a way that these filter material bodies tearing open during the rotation of the filter drum and a turbulent mixing and thus stronger flushing of the Effect filter material.
Bei Filtermaterial mit einem spezifischen Gewicht geringer als Wasser schwimmt dieses in der Filtertrommel 1 auf, so daß bei entsprechender Teilfüllung der Filtertrommel ein unteres Kreissegment 6 freibleibt. Die Querstege 5 bewirken bei Rotation der Filtertrommel 1, daß auch ein schwimmender Filtermaterialkörper 7 aufgerissen, turbulent vermischt und gespült wird. Bei Einsatz von schwimmendem Filtermaterial 7 wird vor allem die Tragkonstruktion der Filtertrommel 1 statisch entlastet.In the case of filter material with a specific weight less than water, this floats in the filter drum 1 , so that a lower circle segment 6 remains free when the filter drum is partially filled. When the filter drum 1 rotates, the transverse webs 5 cause a floating filter material body 7 to be torn open, mixed turbulently and rinsed. When using floating filter material 7 , the supporting structure of the filter drum 1 in particular is relieved of static loads.
Die bei der Rotation der Filtertrommel 1 vom Filtermaterial abgespülten Feinststoffe sinken durch den Sieb- oder Drahtgewebemantel 8 der Filtertrommel 1 zur Beckensohle des Filterbeckens ab. Von dort werden sie durch bekannte Räum- oder Absaugsysteme 9 entfernt und einer getrennten Reinigungsanlage zugeführt.The fine substances rinsed off by the filter material during the rotation of the filter drum 1 sink through the screen or wire mesh jacket 8 of the filter drum 1 to the bottom of the filter basin. From there, they are removed by known clearing or suction systems 9 and fed to a separate cleaning system.
BezugszeichenlisteReference symbol list
1 Filtertrommel
2 Ablaufseite
3 Spülstromseite
4 Ablaufrohr
5 Querstege
6 Kreissegment
7 Filtermaterial
8 Trommelmantel
9 Räum- und Absaugsystem 1 filter drum
2 drain side
3 flushing flow side
4 drain pipe
5 crossbars
6 circle segment
7 filter material
8 drum jacket
9 clearing and suction system
Claims (4)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4002507A DE4002507A1 (en) | 1990-01-29 | 1990-01-29 | Assembly for removal of fine water-borne particles - from outlet pipe |
DE9007395U DE9007395U1 (en) | 1990-01-29 | 1990-01-29 | Filter device with rotating filter drum |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4002507A DE4002507A1 (en) | 1990-01-29 | 1990-01-29 | Assembly for removal of fine water-borne particles - from outlet pipe |
Publications (2)
Publication Number | Publication Date |
---|---|
DE4002507A1 DE4002507A1 (en) | 1991-08-01 |
DE4002507C2 true DE4002507C2 (en) | 1992-03-05 |
Family
ID=6398971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4002507A Granted DE4002507A1 (en) | 1990-01-29 | 1990-01-29 | Assembly for removal of fine water-borne particles - from outlet pipe |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4002507A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19543491A1 (en) * | 1995-11-22 | 1997-05-28 | Passavant Werke | Method of screening or filtering solids contaminated water using screen or filter cleanable by backwashing |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE95203C (en) * | 1900-01-01 | |||
DE83542C (en) * | ||||
DE2447597A1 (en) * | 1974-10-05 | 1976-04-08 | Kalbskopf Karl Heinz Dr Ing | Run-off filter for sewage and plant effluents - contg. perforated bed tube with filter cavity and cylindrical screen |
US4556487A (en) * | 1984-04-05 | 1985-12-03 | Takara Kogyo Co., Ltd. | Water filtering device |
-
1990
- 1990-01-29 DE DE4002507A patent/DE4002507A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE4002507A1 (en) | 1991-08-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69524591T2 (en) | DEVICE AND METHOD FOR SEPARATING SOLIDS FROM FLOWING LIQUIDS OR GASES | |
EP0530672B1 (en) | Washable filter | |
DE3390031T1 (en) | Device for treating water | |
DE2042353B2 (en) | Device for filtering liquids | |
DE2916121C2 (en) | Process for removing suspended solids from liquids | |
DE3107639A1 (en) | METHOD AND DEVICE FOR REMOVING SOLIDS FROM LIQUIDS | |
DE4002507C2 (en) | ||
EP0072388B1 (en) | Method and apparatus for the removal or partial removal of impurities present in flowing water with a falling gradient | |
DE1536826C3 (en) | Filter device | |
DE2315615C3 (en) | Device for the mechanical-biological purification of waste water | |
DE3325203C2 (en) | ||
DE4101701C2 (en) | Coolant filter | |
DE3617054C2 (en) | Thickener | |
DE2818729C3 (en) | Backwashable quick filter system | |
DE2225682A1 (en) | METHOD AND DEVICE FOR MECHANICAL FILTRATION OF LIQUIDS, IN PARTICULAR WATER | |
DE572265C (en) | Filter device for liquids | |
DE1952699A1 (en) | Biological purification of effluent | |
DE9007395U1 (en) | Filter device with rotating filter drum | |
DE2653573C2 (en) | Filter system for water | |
EP0305606B1 (en) | Back-wash filter assembly | |
EP0077411B1 (en) | Process for the elimination of solids from a liquid | |
DE2447597A1 (en) | Run-off filter for sewage and plant effluents - contg. perforated bed tube with filter cavity and cylindrical screen | |
AT250262B (en) | Process for cleaning the filter arrangement of a suspended matter contact system used for water treatment | |
DE19602154C2 (en) | Filter method and filter device for drinking water | |
DE8416988U1 (en) | DEVICE FOR TREATING WATER |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licences declared | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8339 | Ceased/non-payment of the annual fee |