DE4314766C1 - Compressed-air aeration device for water and wastewater - Google Patents

Compressed-air aeration device for water and wastewater

Info

Publication number
DE4314766C1
DE4314766C1 DE19934314766 DE4314766A DE4314766C1 DE 4314766 C1 DE4314766 C1 DE 4314766C1 DE 19934314766 DE19934314766 DE 19934314766 DE 4314766 A DE4314766 A DE 4314766A DE 4314766 C1 DE4314766 C1 DE 4314766C1
Authority
DE
Germany
Prior art keywords
water
compressed
membrane
aeration device
wastewater
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
Application number
DE19934314766
Other languages
German (de)
Inventor
Wolfgang Schmelz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Passavant Werke AG and Co KG filed Critical Passavant Werke AG and Co KG
Priority to DE19934314766 priority Critical patent/DE4314766C1/en
Application granted granted Critical
Publication of DE4314766C1 publication Critical patent/DE4314766C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231245—Fabric in the form of woven, knitted, braided, non-woven or flocculated fibers or filaments
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

The novel compressed-air aeration device for biological clarification stages and comprising a support body with compressed-air feed and a porous membrane clamped in at the rim is characterised in that the felted material used as membrane is furnished on the efflux side with a porous coating applied to be insoluble. The pore size of the coating is below 100 mu m and prevents penetration by bacteria during idle times.

Description

Die Erfindung bezieht sich auf eine Druckluftbelüftungseinrichtung für biologisch arbeitende Stufen von Wasser- und Abwasserbehandlungsanlagen.The invention relates to a Compressed air ventilation device for biologically working Levels of water and wastewater treatment plants.

Bei der biologischen Behandlung von Wasser und Abwasser muß Sauerstoff in das Wasser eingetragen werden. Dies geschieht unter anderem durch Einblasen von Luft unter Druck. Dabei ist es vorteilhaft, möglichst kleine Luftblasen zu erzeugen, da die Austauschfläche für den Sauerstoffübertritt in das Wasser wesentlich größer ist als bei großen Luftblasen. Als Druckluftbelüftungseinrichtungen sind rohr-, teller- oder flächenförmige Körper im Einsatz. Die Membran, deren Durchtrittsöffnungen die Luftblasen erzeugen, ist als geschlitzte Gummifolie, gesinterte Keramik oder gesintertes Kunststoffgranulat verschiedener Korngröße ausgebildet. Die elastische Gummifolie hat den Nachteil, daß die Schlitze beim elastischen Verformen mit aufgeweitet werden, so daß partiell sehr große Luftblasen entstehen, Kunststoff- oder Keramiksinterkörper verstopfen bei intermittierendem Betrieb in den Abschaltpausen mit den Wasserinhaltsstoffen und werden beim Wiedereinschalten nicht freigespült.In the biological treatment of water and wastewater Oxygen can be introduced into the water. this happens among other things by blowing air under pressure. Here it is advantageous to generate the smallest possible air bubbles, because the exchange surface for the oxygen transfer into the Water is much larger than with large air bubbles. When  Compressed air ventilation devices are pipe, plate or sheet-like body in use. The membrane, the Passages that create air bubbles is as slotted rubber sheet, sintered ceramic or sintered Plastic granules of various grain sizes are formed. The elastic rubber film has the disadvantage that the slots be widened with the elastic deformation, so that very large air bubbles arise, plastic or Ceramic sintered bodies clog during intermittent operation in the switch-off breaks with the water constituents and are not flushed out when switched on again.

Es ist auch schon versucht worden, die aus der Abluftfilterung bekannten Filtermaterialien, z. B. Filze mit einer Faserstärke zwischen 10 und 100 µm, in modifizierter Form einzusetzen (DE-A-32 27 671). Die Modifizierung bestand insbesondere darin, das Fasermaterial mit einem aushärtbaren Kunststoff, z. B. PTFE, zu tränken. Dabei hat der aushärtbare Kunststoff auch eine verbindende Wirkung, so daß sich das Fasermaterial z. B. in die Form von Belüftungskerzen pressen läßt, die eigensteif sind.It has also been tried out of the Exhaust air filtering known filter materials, e.g. B. felts with a fiber thickness between 10 and 100 µm, in modified Use form (DE-A-32 27 671). The modification consisted, in particular, of the fiber material with a curable plastic, e.g. B. PTFE to soak. Doing the curable plastic also has a connecting effect, so that the fiber material z. B. in the form of Can press ventilation candles that are inherently rigid.

Obwohl diese Ausführungsform den Nachteil der Verstopfungsanfälligkeit nicht mehr aufweist, besteht weiterhin der Wunsch, einen Belüftungskörper zur Verfügung zu haben, der die verschiedensten Formen annehmen kann. So werden in bestimmten Anwendungsfällen flächenhafte, z. B. tellerförmige oder rechteckige Belüftungskörper benötigt. Hierfür kommen nur Ausführungsformen mit einem die Luftzufuhr aufweisenden Trägerkörper in Frage, der von einer Membran überspannt ist. Außerdem weist Filzmaterial eine stark wechselnde Porengröße auf, die dann doch zu Verstopfungen durch festwachsende Bakterien führt.Although this embodiment has the disadvantage of Is no longer susceptible to constipation the desire to have a ventilator available to have that can take a variety of forms. So are areal in certain applications, e.g. B. plate-shaped or rectangular ventilation body required. For this, only embodiments come with a Carrier body having air supply in question, that of a  Membrane is spanned. In addition, felt material has a greatly changing pore size, which then too Constipation caused by bacteria that grow in solid.

Die vorgeschilderte Aufgabe wird nunmehr erfindungsgemäß dadurch gelöst, daß eine am Trägerkörper randeingespannte Membran aus Nadelfilz verwendet wird, die abströmseitig mit einer unlösbar aufgebrachten porösen Beschichtung versehen ist, deren Porengröße unter 100 µm liegt. Diese Porengröße ist so bemessen, daß in den Betriebspausen die Bakterien sich an der Oberfläche der Beschichtung ablagern und nicht mehr in den Filz eindringen. Im Betrieb sorgt diese geringe Porengröße darüberhinaus dafür, daß über die ganze Fläche gleichbleibend kleine Luftblasen erzeugt werden. Der gleichbleibende Druckverlust sorgt auch dafür, daß bereits bei niedriger Beaufschlagung von z. B. 15 m3 Luft/h. m2 die ganze Fläche wirksam ist. Das beschichtete Filzmaterial kann in Bahnen geliefert und dann auf die beliebige Flächenform zugeschnitten werden.The above-described object is now achieved in accordance with the invention in that a membrane made of needle felt, which is clamped on the edge of the support body, is provided on the outflow side with an insoluble applied porous coating, the pore size of which is below 100 μm. This pore size is dimensioned so that the bacteria are deposited on the surface of the coating during the breaks and no longer penetrate into the felt. In operation, this small pore size also ensures that small air bubbles are generated over the entire area. The constant pressure loss also ensures that even at low loads of z. B. 15 m 3 air / h. m 2 the entire area is effective. The coated felt material can be supplied in sheets and then cut to any shape.

Im Betrieb mit den neuen Belüftungseinrichtungen hat sich eine hohe Beständigkeit gegen alle Wasser- und Abwasserarten gezeigt. Dadurch, daß schon bei kleinen Luftmengen die volle Beaufschlagung mit großer Blasenzahl gewährleistet ist, können die gering belasteten biologischen Klärstufen, in denen diese Belüftungskörper eingesetzt werden, optimal umgewälzt werden. Die Blasengröße übersteigt in keinem Fall 2 mm. Gegenüber Tellerbelüftern mit geschlitzter Gummifolie steigt der Sauerstoffeintrag um mindestens 20% und die Ökonomie, d. h. die Energieausnützung, um denselben Wert.In operation with the new ventilation devices high resistance to all types of water and waste water shown. Because even with small amounts of air the full Loading with a large number of bubbles is guaranteed, can the slightly contaminated biological clarification stages, in where these ventilation bodies are used, optimal be circulated. The bubble size never exceeds 2 mm. Opposite plate aerators with slotted rubber film the oxygen input increases by at least 20% and that  Economy, d. H. the use of energy to the same value.

In vorteilhafter Ausgestaltung der Erfindung besteht die Beschichtung des Filzmaterials aus einem Polyurethanschaum geringer Dicke. Ihre Porengröße liegt unter 100 µm. Die Filamente des Filzmaterials bestehen vorzugsweise aus abwasserbeständigem Polyester. Die Beschichtung ist unlösbar mit dem Filz verbunden und übersteht die bei den Wiederinbetriebnahmen eintretenden Wölbungen und Dehnungen ohne Veränderung des Blasenbildes.In an advantageous embodiment of the invention Coating of the felt material from a polyurethane foam small thickness. Their pore size is less than 100 µm. The Filaments of the felt material preferably consist of sewage-resistant polyester. The coating is insoluble connected to the felt and survives the Recommissioning bulges and strains without changing the bubble pattern.

Die Abb. zeigt einen Schnitt durch die Mittenachse eines mit der erfindungsgemäßen Membran bespannten Tellerbelüfters. Der kreisförmige Trägerkörper 1 besitzt rückseitig den Anschlußstutzen 2 für die Druckluftzufuhr. Der Rand enthält Gewindesacklöcher 3, in denen der den Filzzuschnitt 4 einspannende Ring 5 befestigt wird (Schrauben 6).The figure shows a section through the center axis of a plate aerator covered with the membrane according to the invention. The circular support body 1 has on the back the connecting piece 2 for the compressed air supply. The edge contains threaded blind holes 3 in which the ring 5 which clamps the felt blank 4 is fastened (screws 6 ).

Claims (3)

1. Druckluftbelüftungseinrichtung für biologisch arbeitende Stufen von Wasser- und Abwasserbehandlungsanlagen, bestehend aus einem Trägerkörper mit rückseitiger Luftzufuhröffnung und einer randeingespannten Membran, die aus Nadelfilz besteht, dadurch gekennzeichnet, daß die Membran (4) abströmseitig mit einer unlösbar aufgebrachten porösen Beschichtung versehen ist, deren Porengröße unter 100 µm liegt.1. Compressed air ventilation device for biological stages of water and wastewater treatment plants, consisting of a carrier body with rear air supply opening and an edge-clamped membrane, which consists of needle felt, characterized in that the membrane ( 4 ) is provided on the downstream side with an insoluble applied porous coating, the Pore size is less than 100 microns. 2. Belüftungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Filamente des Nadelfilz aus Polyester bestehen.2. Ventilation device according to claim 1, characterized characterized in that the filaments of the Needle felt made of polyester. 3. Belüftungseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Beschichtung aus einem Polyurethanschaum besteht.3. Ventilation device according to claim 1 or 2, characterized in that the Coating consists of a polyurethane foam.
DE19934314766 1993-05-05 1993-05-05 Compressed-air aeration device for water and wastewater Expired - Fee Related DE4314766C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19934314766 DE4314766C1 (en) 1993-05-05 1993-05-05 Compressed-air aeration device for water and wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19934314766 DE4314766C1 (en) 1993-05-05 1993-05-05 Compressed-air aeration device for water and wastewater

Publications (1)

Publication Number Publication Date
DE4314766C1 true DE4314766C1 (en) 1994-09-08

Family

ID=6487176

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19934314766 Expired - Fee Related DE4314766C1 (en) 1993-05-05 1993-05-05 Compressed-air aeration device for water and wastewater

Country Status (1)

Country Link
DE (1) DE4314766C1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744169A2 (en) * 1995-05-23 1996-11-27 Biocomfort Produkte zur Gesundheitspflege GmbH Bath aerating mat with air outflow plates
DE19722781A1 (en) * 1997-05-30 1998-12-03 Ott Rita Gassing unit for liquids, especially for aerating waste water
EP1545753A1 (en) * 2002-08-13 2005-06-29 Itt Manufacturing Enterprises, Inc. Strip diffuser pct i
DE102008047092A1 (en) * 2008-09-12 2010-03-18 Rehau Ag + Co. Plate ventilator for wastewater treatment
US8002249B2 (en) 2002-08-13 2011-08-23 Itt Manufacturing Enterprises, Inc. Strip diffuser
WO2011127914A1 (en) * 2010-04-15 2011-10-20 Ott Friederike Gassing device for introducing a gas into a liquid
WO2011129947A1 (en) * 2010-04-12 2011-10-20 Itt Manufacturing Enterprises, Inc. End seals for aeration diffuser assembly
EP2497575A1 (en) * 2011-03-11 2012-09-12 Siemens Aktiengesellschaft Flotation device with a gas diffuser made from a foam material

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227671A1 (en) * 1982-07-23 1984-01-26 Reinhart von Dr.-Ing. 8011 Solalinden Nordenskjöld Aeration element for feeding air or oxygen into the waste water of purification plants or into natural waters
DE3429197C1 (en) * 1984-08-08 1986-01-30 Dieter 6369 Niederdorfelden Feike Aerator for enriching a liquid with a gas

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227671A1 (en) * 1982-07-23 1984-01-26 Reinhart von Dr.-Ing. 8011 Solalinden Nordenskjöld Aeration element for feeding air or oxygen into the waste water of purification plants or into natural waters
DE3429197C1 (en) * 1984-08-08 1986-01-30 Dieter 6369 Niederdorfelden Feike Aerator for enriching a liquid with a gas

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0744169A3 (en) * 1995-05-23 1997-01-29 Biocomfort Gmbh Bath aerating mat with air outflow plates
EP0744169A2 (en) * 1995-05-23 1996-11-27 Biocomfort Produkte zur Gesundheitspflege GmbH Bath aerating mat with air outflow plates
DE19722781A1 (en) * 1997-05-30 1998-12-03 Ott Rita Gassing unit for liquids, especially for aerating waste water
US8002249B2 (en) 2002-08-13 2011-08-23 Itt Manufacturing Enterprises, Inc. Strip diffuser
EP1545753A1 (en) * 2002-08-13 2005-06-29 Itt Manufacturing Enterprises, Inc. Strip diffuser pct i
EP1545753A4 (en) * 2002-08-13 2007-03-07 Itt Mfg Enterprises Inc Strip diffuser pct i
EP2110170A3 (en) * 2002-08-13 2009-12-09 ITT Manufacturing Enterprises Inc. Membrane strip diffuser for wastewater treatment
DE102008047092A1 (en) * 2008-09-12 2010-03-18 Rehau Ag + Co. Plate ventilator for wastewater treatment
WO2011129947A1 (en) * 2010-04-12 2011-10-20 Itt Manufacturing Enterprises, Inc. End seals for aeration diffuser assembly
US8371561B2 (en) 2010-04-12 2013-02-12 Xylem Ip Holdings Llc Aeration diffuser assembly end seal
CN102985173A (en) * 2010-04-12 2013-03-20 赛乐姆知识产权控股有限责任公司 Aeration diffuser assembly end seal
CN102985173B (en) * 2010-04-12 2014-12-24 赛乐姆知识产权控股有限责任公司 Aeration diffuser assembly end seal
WO2011127914A1 (en) * 2010-04-15 2011-10-20 Ott Friederike Gassing device for introducing a gas into a liquid
EP2497575A1 (en) * 2011-03-11 2012-09-12 Siemens Aktiengesellschaft Flotation device with a gas diffuser made from a foam material

Similar Documents

Publication Publication Date Title
DE69510661T3 (en) USE OF BIOFILM CARRIER FOR WATER AND WASTE WATER CLEANING
EP0028728B1 (en) Device for aerating water with fine air bubbles
DE1071054B (en) Distribution device for the dispersion of grains in liquids
DE4314766C1 (en) Compressed-air aeration device for water and wastewater
EP0104525B1 (en) Apparatus and process for the biological purification of waste water
EP0363865B1 (en) Aerating device
DE60035326T2 (en) Process for the treatment of wastewater
DE3611582A1 (en) CARRIER MATERIAL FOR IMOBILIZING MICROORGANISMS
DE60029804T2 (en) COVER FOR THE AEROBIC TREATMENT OF BIODEGRADABLE MATERIAL
EP0171452A1 (en) Fine-bubble diffuser for aeration of water
EP0133545B1 (en) Process and apparatus for the biological treatment of waste water
EP0385198A1 (en) Device for water and waste water aeration
EP0738687A1 (en) Waste water treatment plant
EP2143691A2 (en) Membrane bioreactor and method for processing waste water
EP3233255B1 (en) Air distributor for the aeration of a water volume, air distributor foil for an air distributor of said type, and method for producing an air distributor foil of said type
CH461389A (en) Device for aerating waste water
DE10008449C2 (en) gassing
DE2630347C3 (en) Device for aeration of groundwater in wells
DE3834317C1 (en) Apparatus for introducing gas into a liquid
DE2604674B2 (en) Highly effective activated sludge process and device for its implementation
DE3837798A1 (en) Carrier body as growth surface for biomass
DE4336018B4 (en) Device for sterile filtering and introducing sterile fluid material
CH688025A5 (en) Aerators.
DE19501195C1 (en) Long term purification of room air
DE19734759C1 (en) Waste water treatment and assembly

Legal Events

Date Code Title Description
8100 Publication of patent without earlier publication of application
D1 Grant (no unexamined application published) patent law 81
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee